addendum #4 bl086-15 purchase of a reuse water … ad4.pdfprovision of a second water treatment...

September 14, 2015

ADDENDUM #4

BL086-15 Purchase of a Reuse Water Treatment Pilot Plant and a Biofiltration Water Treatment Pilot Plant

This addendum is being issued to expand the scope of services requested through this solicitation to include provision of a second water treatment pilot plant facility. The second pilot plant, which will initially be used for testing biological filtration optimization strategies shall be similar to the pilot plant originally specified in this Invitation to Bid. The clarifications provided in this Addendum shall supersede the clarifications of intent provided in Addendum Nos. 1 & 2. However, clarification provided in Addendum No. 3 shall still apply. The clarifications of intent associated with this addendum are provided below: C1. ***SEE ATTACHED REVISED BID SCHEDULE #2*** C2. **SEE ATTACHED REVISED MININUM SPECIFICATION FOR PILOT PLANT EQUIPMENT,

INCLUDING THE ASSOCIATED FIGURES AND TABLES.** C3. The name of this solicitation has been changed to Purchase of a Reuse Water Treatment Pilot Plant

and a Biofiltration Water Treatment Pilot Plant.

C4. The question deadline has been postponed to September 16, 2015.

C5. Clarification of Intent:

On Page 2 of the solicitation document, REPLACE all references in the first two paragraphs which reference a singular pilot plant with two pilot plants.


On Page 2 of the solicitation document, REMOVE numbered items 1 2, & 3 in the listing and REPLACE the text with the following:

1. Two fully operational pilot plants, capable of operating on single-phase 120V electrical power, sized appropriately to operate inside the existing Pilot Plant Room at the Shoal Creek Filter Plant.

2. Necessary installation services to connect to the existing influent connections in the Pilot Plant Room.

3. A pilot plant influent water blending system and tank for the reuse pilot AND an equalization tank for the biofiltration pilot.

C7. Clarification of Intent

On Page 2, ADD the following items to the numbered listing:

11. Provision of an Emergency Shower/Emergency Eyewash Station. 12. Design of an elevated work platform that will be constructed and installed by others.

BL086-15 Ad#4


On Page 3, Invitation to Submit Bids, REMOVE Paragraphs B and C in its entirety and REPLACE with the following:

B. The Gwinnett County Department of Water Resources (County) hereby requests Bids for a Reuse Water Treatment Pilot Plant and a Biofiltration Water Treatment Pilot Plant. This submission will assist the County in selecting firms to provide pilot-scale water treatment process equipment at the Shoal Creek Filter Plant. The County needs sufficient information to determine the selected vendor has the equipment, experience, and qualifications necessary to complete the anticipated work in a professional manner, without risk of damage to the systems.

C. Proposed bid prices in the Bid Schedule will cover all labor, equipment, tools, materials, supervision, transportation, shipping, design, submittals, installation, coordination, testing, commissioning, and accessories required to install two fully operational pilot plants as proposed under this contract. The full cost of bid preparation is to be borne by the bidding firm. Any deviations from the bid scope (additional optional items beyond the scope of the contained bid descriptions) shall have the costs differentiated from the base bid.


On Page 5, Bid Schedule, replace with the attached revised Bid Schedule. C10. Clarification of Intent:

It is the intent of Gwinnett County to require a Bid Bond and a Payment and Performance Bond under this solicitation. Requirements for such bonds are specified in the General Instructions for Bidders, Terms and Conditions included in this Invitation to Bid (Page 23). Therefore, the Bid Schedule (Page 5 of this Invitation to Bid) is hereby reissued in its entirety and attached to this Addendum No. 4 to specify this requirement.


It is the intent of Gwinnett County to require that the selected service provider furnish a fully operational pilot plant system no later than 120 calendar days from the issuance of the Notice to Proceed from Gwinnett County. Therefore, the Bid Schedule (Page 5 of this Invitation to Bid) is hereby reissued in its entirety and attached to this Addendum No. 4 to specify this requirement.

C12. Clarification of Intent: On Pages 13 through 18, it is the intent of Gwinnett County to REMOVE the Minimum Specifications

for Pilot Plant Equipment Section, in its entirety and REPLACE the subject section with the revised specification document, including revised figures and tables attached hereto.

This addendum should be signed in the space provided below and returned with your bid. Failure to do so may result in your bid being deemed non-responsive. Company Name Authorized Representative Thank you. Holly Cafferata, CPPB Purchasing Manager

BL086-15 Revised Page 5 FAILURE TO RETURN THIS PAGE AS PART OF YOUR BID DOCUMENT MAY RESULT IN REJECTION OF BID

REVISED BID SCHEDULE #2

Bid Item

Description Units Quantity Unit Price Total Price

1 Pilot plant influent connection & blending/EQ tank EA 2 $ $

2 Ozone skid, including applicable amendment dosing systems

EA 2 $ $

3 Coagulation/flocculation skid, including applicable amendment dosing systems

EA 2 $ $

4 Biological filtration skid (4 filters) including backwashing module and amendment dosing system

EA 2 $ $

5 Finished water tank EA 2 $ $

6 Emergency Shower/Eyewash System EA 1 $ $

7 Data acquisition PLC and HMI system EA 2 $ $

8 Installation/Commissioning LS 1 $ $

9 Training/technical assistance LS 1 $ $

10 Elevated Platform Design LS 1

Total Base Bid (Bid Item 1 through 10): (use words) Dollars $

The selected provider agrees to provide all material, equipment, systems and services quoted under the Base Bid no later than 120 calendar days from the date of issuance of the Notice to Proceed. The Bidder acknowledges that failure to provide the pilot plant system may result in liquidated damages in the amount of up to $500 per day for up to 5% of the bid amount and/or cancellation of contract award.

OPTIONAL ADDITIVE BID ITEMS

Gwinnett County may choose to include the following bid items with the pilot plant procurement:

Optional Item

Description Units Quantity Unit Price Total Price

A Operations and Maintenance Manual EA 2 $ $

B Quarterly Technical Assessments EA 4 $ $

C Basis of Design Memorandum LS 1 $ $

This solicitation requires that bidders provide a five percent (5%) bid bond (base bid) in accordance with the General Instructions for Bidders, Terms and Conditions listed herein. The selected service provider shall provide a 100% Payment Bond and a 100% Performance Bond within 10 calendar days upon receipt of the Notice of Award.

BL086-15 Revised Page 13

REVISED MINIMUM SPECIFICATIONS FOR PILOT PLANT EQUIPMENT 1. GENERAL CONDITIONS:

1.1. Work Schedule:

a. Service provider shall coordinate all work with the appropriate County personnel so that the facility’s functionality is not adversely impacted. Work shall not interfere with the operation of the treatment process and associated equipment nor hinder the day-to-day operation of the facility.

b. The normal daytime schedule for each facility is 7:00 AM to 4:00 PM Monday through Friday, excluding County Holidays. Service provider is to perform the required services within this time frame.

c. SPECIAL NOTIFICATIONS: Service provider shall notify appropriate division contact to obtain permission to begin work and shall not take any operating equipment out of service. Work shall be scheduled at least 48 hours in advance when possible. Note that County service demands shall dictate work schedules.

1.2. Site Conditions:

a. General: i. While on-site, service provider shall be responsible for obeying the facility’s policies regarding

use of parking spaces. ii. Service provider shall be responsible for maintaining a hazard-free work area. All tools,

equipment, materials, apparatus, supplies and parts shall be neatly stored in a designated area near the work site in full compliance with 1993 OSHA regulations.

iii. Service provider shall only work and set-up equipment within the area designated by the County. Full access to the existing facilities must be maintained at all times, unless directed otherwise on a specific assignment.

iv. Service provider may have limited use of 120-volt single-phase electric power, where available. v. Mechanical, electrical, structural, and architectural drawings showing the layout of the pilot plant

room are included in Attachment 1.

b. Locations: i. The pilot plant shall be installed at the Shoal Creek Filter Plant located at 1755 Buford Dam

Road, Buford, GA 30518. There is a large interior room at the Shoal Creek Filter Plant where a former pilot plant was located. This room contains several single phase 120 V outlets and is approximately 25 feet wide by 25 feet in length by 40 feet high. There are four 20 Amp branch circuits contained in a wiring strip mounted on the North wall. Each circuit has eight duplex receptacles for a total of 32 receptacles. There is one dedicated 20 Amp quad receptacle located on the East wall. The outlets are ground fault circuit interrupter (GFCI) protected. Gwinnett County will supply the influent water lines to this room. Pilot plant effluent or waste water will be discharged to an existing 4-inch diameter sewer line drain. The two pilot plants shall be sized to fit within the pilot plant room. This solicitation includes design of an elevated platform to access both of the coagulation/flocculation skids and top of the filtration skids. Installation of the elevated platform will be provided by Gwinnett County and is anticipated to be anchored to the floor.

ii. The at-grade entrance to the Shoal Creek Filter Plant Filter Building is via double doors with total opening measuring 90 inches wide by 126 inches tall. The entrance to the pilot room inside the building will control the size of parts that can enter, with total opening measuring 71 ½ inches wide by 74 inches high.

1.3. Bid Pricing


The prices offered in the Bid Schedule shall be based on the following descriptions: a. Bid Items 1 through 7: Pilot Plant Equipment:

The lump sum bid prices provided under these pay items shall include compensation for furnishing all pilot plant equipment, labor, materials, equipment, supplies, tools, supervision, engineering, submittals, transportation, shipping, insurance, bonds, and all other ancillary services necessary to provide a complete, fully-operational water treatment pilot plant that will be purchased by the County.

b. Bid Item No. 8: Installation/Commissioning Lump sum payment of the bid price provided under this pay item shall include compensation for all necessary labor, equipment, materials, supplies, tools, supervision, insurance, bonds, and ancillary services for proper installation, testing and full system commissioning of all pilot plant equipment for two complete, fully functional water treatment pilot plant system. Testing and system commissioning services specified in the Minimum Specifications for Pilot Plant Equipment section of this Invitation to Bid shall be provided under this Bid Item.

c. Bid Item No. 9: Training Lump sum payment under this bid item shall include compensation for all labor, equipment, materials, tools, supplies, transportation, insurance, and other ancillary services necessary to train DWR staff and its representatives on the techniques to provide proper operation and maintenance and troubleshooting of all equipment and systems installed under this contract. The service provider shall include a minimum of 2 working days (16 working hours) for onsite classroom and hands-on training for each pilot unit. Training sessions shall be conducted by qualified, experienced, factory-trained representatives of the pilot plant supplier. Training sessions shall be video recorded.

d. Bid Item No. 10: Elevated Platform Design

Lump sum payment of the bid price provided under this pay item shall include compensation for all necessary labor, equipment, materials, supplies, tools, supervision, engineering, submittals, insurance, bonds, and all other ancillary services necessary to provide an elevated working platform that will be constructed by others for use on subject piloting facilities.

e. Optional Bid Item A: Operations and Maintenance Manual The unit rate purchase price shall include an operations and maintenance manual for each skid and ancillary equipment included with the each pilot plant. The manual shall be delivered at the time of pilot plant installation.

f. Optional Bid Item B: Quarterly Technical Assessments Measurement – Measurement shall be based on the actual number of technical assessments, anticipated to be conducted on a quarterly basis over the duration of one year. Assessments will include visual inspection of system components and adjustments and/or repairs as needed. Payment – The unit price bid under this pay item shall include compensation for time and travel to inspect the pilot plant and provide recommendations on operation, potential modifications, and maintenance.

g. Optional Bid Item C: Basis of Design Memorandum The lump sum purchase price shall include the basis of design memorandum with as-built drawings of pilot system, the basis of design for the pilot components, and a description of any deviations from the specified Basic Requirements.

1.4. On-site Inspection:

The County may conduct inspections of the equipment and services provided to verify compliance with the contract and acceptable performance of the systems.

BL086-15 Revised Page 15 2. BASIC REQUIREMENTS:

Service provider shall be responsible for furnishing and/or procuring all labor, materials, equipment, and accessories for setting up and testing the two pilot plants. The service provider is not required to provide operations staff or dosing chemicals required to operate the pilot plants. However, the service provider shall provide design submittals for review and approval by Gwinnett County prior to fabricating the pilot equipment. The service provider shall also calibration standards for the online monitoring equipment specified herein and support during installation. Technical support services on equipment maintenance or troubleshooting may be requested on an as-needed basis.

The two pilot plants shall each have a nominal capacity of 6 gallons per minute (gpm) and mimic the County’s full-scale Shoal Creek Filter Plant treatment train, including ozonation, coagulation/ flocculation, and direct filtration. The pilot process flow diagram (PFD) and piping and instrumentation diagram (P&ID) are shown in Figures 1 to 5. Table 1 shows the design specifications for each treatment train for the two pilot plants. Photos of the pilot plant room are shown in Figures 6 and 7. The service provider shall be responsible for procuring tanks, mixers, pumps, controls, valves, and miscellaneous parts required. The two pilot plants shall each include the following components: Pilot plant room: Gwinnett County DWR will provide the influent line at the pilot plant room located

within the Shoal Creek Filter Plant. The pilot plant will be installed inside this fully-enclosed room. The County anticipates installing two pilot plants to be operated side-by-side in this room. The pilot plant footprint under this solicitation shall be small enough to allow both pilots and effective working room to fit within the available space or less. The pilot plant room is 25 feet by 25 feet with 40 feet of overhead space and contains a drain to sewer and single phase 120V electrical power. The sewer drain is a 4-inch diameter line and is anticipated to provide sufficient capacity for both pilots running at full capacity (e.g., both pilots running at 6 gpm). Figure 7 shows the location of several single-phase 3 prong outlets along one of the walls.

Influent line: The service provider shall be responsible for making connections to the aforementioned influent line upon installation. The pilot plant influent water will have two intake lines: the Shoal Creek Filter Plant raw water from Lake Lanier, and the F. Wayne Hill wastewater plant effluent. The pilot plant influent line from the Lake Lanier raw water is anticipated to have approximately 40 feet (17.4 pounds per square inch [psi]) of constant pressure head to allow for gravity flow into the equalization tank. This influent line will be a 2-inch diameter PVC line entering the South wall of the pilot plant room at approximately 28 feet above the finished floor elevation and will be extended to the floor level. The influent line will be capped with a valve and plug. The second influent line from the F. Wayne Hill Water Reclamation Center (WRC) is anticipated to have 40 feet (17.4 psi) of constant pressure head and will have a 2-inch diameter PVC line installed next to the Lake Lanier raw water influent line. Bag filters with an effluent pressure gauge shall be installed prior to the flow meters. The bag filters shall be of sufficient pore size to prevent loading of debris in the equalization tank; this is anticipated to require a 60 mesh strainer with a 200 micron polyester felt filter bag.

Pilot plant testing for the DPR pilot will involve blending of water from both influent lines and a proportional mixing controller shall be installed to attain specified blending ratios (Figure 3). Flowmeter readings shall be tied to a PID controller to maintain consistent blending of the two water types modulated by a diaphragm motor operating valve (MOV). The blending ratios are anticipated to be 0, 10, 20, 50 and 100% from the F. Wayne Hill wastewater plant effluent and the remainder from the Shoal Creek Filter Plant raw water from Lake Lanier. The biofiltration pilot will receive all of its intake water from the Shoal Creek Filter Plant raw water from Lake Lanier.

Blending tank and feed pump: The blending tank used for the DPR pilot and the equalization tank used for the biofiltration pilot shall both be opaque tanks with a lid and a minimum capacity of 1,000 gallons each. The tank shall contain a low level switch to shut off the variable speed feed pump (P1) if water levels drop below the low level switch height. The tank shall show water level with exterior graduations on a sight-tube and allow for excess water to overflow to the sewer. Pump P1 will provide sufficient


head to pump water through the ozonation, coagulation/flocculation, and filtration. Piping between each treatment step shall be slightly oversized (minimum of 2-inch diameter) to minimize headloss. There shall be a minimum of 3 to 6 inches of elevation between each skid (e.g., 3 to 6 inches of elevation between ozone and coagulation/flocculation, and 3 to 6 inches between coagulation/flocculation and filtration).

Online instrumentation: The service provider shall provide and incorporate connections for installation of online probes for monitoring of temperature, turbidity, pH, and oxidation reduction potential (ORP) as shown in Figures 3 and 5. Dissolved oxygen (DO) probes, flow through cells, and SC200 controllers for the DO probes as well as ultra violet (UV) analyzers and YSI probe will be provided and installed by Gwinnett County separately. Online monitoring equipment shall have a minimum sensitivity of 0.1 standard units (SU) for pH, 1 millivolts (mV) for ORP and 0.01 Nephelometric turbidity units (NTU) for turbidity. The service provider shall include aqueous calibration standard solutions with the monitoring probes that meet manufacturer specifications, including at a minimum 1 liter each of pH 4, 7, and 10 SU buffer standards; turbidity 0, 1, and 10 NTU standards; and two-point calibration standards for ORP. Online ozone residual probes and an ambient ozone monitor shall be included with the ozone skid. Waste streams shall be directed to the onsite sewer drain located within the pilot room.

HMI and PLC system: Data generated from all online instrumentation shall be monitored by the Programmable Logic Controller (PLC). The Human Machine Interface (HMI) system specific to each pilot plant shall display these data values. The HMI shall provide real time and historical trending of the analyzers data. An operator shall be able to monitor and adjust all system operations, settings and controls through the HMI. The HMI displays and software shall be included with the pilot plant. Automatic controls for the influent line proportional mixer, ozone skid ozone generator, and filtration skid backwashing based on filter run time, effluent turbidity, and headloss shall be incorporated into the PLC. The control and monitoring of these shall be accessible through the HMI.

Ozone skid: The service provider shall furnish an ozone generator for each pilot plant capable of producing an ozone dose of up to 6 milligrams per liter (mg/L) at a plant flow rate of 6 gpm using side-stream injection. Each ozone skid shall also include ozone contact tanks with a cumulative contact time of up to 38 minutes, as well as an ozone destruct unit. The oxygen concentrator shall have a tank prior to the ozone generator to maintain steady pressure under all operating conditions specified herein. The system shall be an oxygen-fed, air-cooled system. An ozone analyzer shall be installed prior to the ozone contactors and readings shall be tied to a PID to maintain a consistent flow and pressure (±10 percent) from the ozone feed gas under the operating conditions shown in Table 1. Any excess ozone from the generator that would result in an ozone concentration that exceeds the target dose shall be vented to the ozone destruct unit prior to injection. An ambient ozone monitor shall be tied to a control switch for the ozone generator to terminate ozone generation if ambient air concentrations exceed health screening levels. The control switch for the ozone generator shall also terminate ozone generation if there is a loss of water flow through the system. A variable speed peristaltic pump shall be used for dosing an aqueous ozone quenching agent, calcium thiosulfate, if needed after the ozone contactors. The peristaltic pump shall be tied to a PID controller to modify the dose based on readings from the inline ozone residual probe. The quenching agent feed tank shall be housed within secondary containment with a minimum volume equal to the quenching agent feed tank capacity. The ozone skid shall have online instrumentation for monitoring ozone residual with a digital display and capability for data logging. The service provider shall be responsible for procuring all pipes, valves, meters, and miscellaneous parts required for successful installation, operations, and maintenance of the ozone unit. The ozone contactors for both pilot plants shall have sample taps installed at the following locations, assuming operations at the full design capacity of 6 gpm: approximately once per minute of hydraulic residence time for the first 10 minutes, then every 5 minutes for the remaining hydraulic residence time.

Coagulation and flocculation skid: The service provider shall be responsible for providing a two-stage coagulation and three-stage flocculation skid for pilot plant, capable of dosing 0.2 to 1.5 mg/L of ferric chloride coagulant at a velocity gradient of 1,000 per second (/sec), and 1 to 2 mg/L of Clarifloc Polydimethylsiloxane flocculent at a velocity gradient of 20 to 100/sec (Table 1). The mixing basin sizes


shall have sufficient volume to attain 36 seconds of coagulation mixing with 5 to 20 minutes of flocculation mixing. The basin volume shall be adjustable to allow testing of various mixing durations. The coagulation and flocculation mixers shall be variable speed. Water shall be pumped from the ozone skid effluent to the elevated coagulation/flocculation skid located on a platform. Coagulant and flocculent shall be dosed using variable speed peristaltic pumps. The coagulant and flocculent feed tanks shall be opaque and housed within secondary containment with a minimum volume equal to the feed tank capacity.

Filtration skid: The filtration skid for each pilot plant shall contain four 6-inch inner diameter clear PVC filter assemblies with a total height of up to 22 feet. The influent/backwash water line shall be a minimum of 4 feet below the top of the filter column with an overflow drain to sewer near the top of the filter column. The total column height shall allow for 30% bed expansion during backwash and the backwash effluent line shall be sufficient to minimize the potential for media loss during backwashing. The filters will contain 60 inches of anthracite and 12 inches of sand; this media will be obtained from the Shoal Creek Filter Plant full scale filters. The service provider shall mount these pilot filters vertically using fiberglass unistruts and stainless steel pipe clamps. The filters shall be constructed to allow for downward flow by gravity from the coagulation/flocculation skid. The filter flow rate shall be modulated using MOV controlled by both the influent flow meter and the filter level indicating transmitter to maintain a constant 11.5 feet of submergence above the filters. The service provider shall incorporate a clear PVC common header that allows excess filter influent water to drain to the onsite sewer line if needed. Each pilot study filter shall be equipped with a 2-inch connection located at approximately 100 inches from the bottom of the filter to allow for draining the water prior to a backwash and to discharge backwash water. Sufficient space shall be provided below the underdrains to allow for air scour and backwashing. In addition, each filter shall be equipped with online instrumentation shown in the P&ID including an individual turbidimeter, flow meter, level indicating transmitter and modulating valve for flow control. The service provider shall have top of each pilot filter open to allow for filter media sampling from the top of the filter bed. The underdrains shall be comprised of Leopold IMS caps.

Amendment dosing systems: The service provider shall be responsible for procuring the tanks, mixers, and feed pumps necessary for adding phosphorous and hydrogen peroxide into the filter influent for each pilot plant at the concentrations specified in Table 1. The dosing pumps shall be variable speed, multichannel (4 head) peristaltic pumps. All tanks shall be opaque and housed within secondary containment with a minimum volume equal to the feed tank capacity. The hydrogen peroxide stock tank and peristaltic pump tubing used for dosing shall be comprised of a chemically-compatible material with a concentration of up to 3,000 mg/L of hydrogen peroxide.

Backwashing system: the service provider shall be responsible for furnishing a backwashing system for both pilot filtration skids, including air scouring and capability for chlorinated or unchlorinated backwash. Filter effluent water will be routed to the 200 gallon backwash water tank prior to initiating a backwash. The air scouring shall have capability to provide 2 to 5 actual cubic feet per minute per square foot (ACFM/ft2). The air scour air compressor shall have a receiving tank with inlet and outlet pressure regulating valves and pressure gauges. The backwashing pump shall be a variable speed centrifugal pump with a capacity of 7 gpm at 20 psi. The pump shall be sufficient to supply 3 to 25 gallons per minute per square foot (gpm/ft2) of flow sufficient to enable up to 30% bed expansion during backwashing. The backwash tank shall show water level with exterior graduations on a sight-tube and allow for excess water to overflow to the sewer. Chlorine shall be added to the backwash water and be equipped with a day tank, mixers, calibration cylinders, and peristaltic chemical variable speed pumps to feed sodium hypochlorite. The chlorine feed tank shall be opaque and housed within secondary containment with a minimum volume equal to the feed tank capacity. Ranges of anticipated flow rates are shown in Table 1. Backwashing shall have the ability to be manually or automatically triggered by filter run time, headloss, or turbidity. The backwash effluent line from each filter shall be connected to a clear PVC common header to allow the operator to view color and turbidity in the spent backwash water and to collect samples.


Anion Exchange Unit Connection: A two-stage anion exchange skid may be installed at a later time to remove excess nitrate after filtration for the DPR pilot plant only (Figure 3). The pilot plant shall include a 2-inch diameter connection to the anion exchange influent line and a port for a connection to the anion exchange effluent. The anticipated footprint of the anion exchange skid is 3 feet by 10 feet.

Finished water tank: A separate finished water tank shall be installed for both pilot plants. The finished water tank shall be a minimum of 200 gallons with an overflow to sewer. The tank shall show water level with exterior graduations on a sight-tube and allow for excess water to overflow to the sewer. A chlorine tank and variable speed peristaltic dosing pump shall be included that meets the specifications shown in Table 1. All stock tanks shall be opaque and housed within secondary containment with a minimum volume equal to the feed tank capacity.

Elevated platform: The service provider shall design a work platform in accordance with all local, state, and federal requirements for working at heights of up to 20 feet. The platform shall allow sufficient room to conduct operations and maintenance as well as sampling of the coagulation/ flocculation skid, and the top of the filter columns. Design drawings of the elevated platform shall provide sufficient detail for an on-site contractor to construct and install. The platform shall be designed to hold the weight of the coagulation and flocculation skid while operating at a flow rate of 6 gpm and up to 5 personnel at a time. The platform edges shall contain railing the meets all OSHA health and safety requirements.

Emergency shower and eye wash station: One free-standing Haws Company AXION® MSR combination emergency eye wash shower station, or similar, shall be installed within the pilot room. The eye wash station shall meet specifications meets ANSI Z358.2014- safety equipment standards. The emergency shower and eye wash station shall be installed so that discharge water is routed to the pilot plant room sewer line. The County shall provide tepid water for the emergency shower and eye wash station and alarms tied into the SCADA system.

Commissioning and training: The service provider shall include an onsite visit for installation, start-up testing, system commissioning, and training for the pilot operators. Start-up testing shall include leak testing of all components of the pilot system (e.g., hydrostatic pressure testing) including backwashing. Service provider shall be on site for a minimum of 3 working days (24 regular working hours) to complete testing and system commissioning of each of the piloting facilities, unless both pilots are tested and commissioned during the same week. In that case, a minimum of 5 working days shall be acceptable. Operations training for the County personnel shall be conducted over the minimum of one working day for each pilot.

Equipment warranty: The service provider shall include a one-year warranty on all equipment, materials, supplies, parts, expenses, and labor. The warranty shall be effective provided pilot plant equipment is operated within manufacturer’s specifications.

Operations and maintenance manuals for individual equipment within the pilot plant, including but not limited to: pumps, air compressor, online probes, bag filters, air filters, mixers, flow totalizers, flow meters, motor operated valves, proportional mixer, level switches, y-strainer, and pressure transducer. This shall be included with the base bid price. Optional Bid Item A includes a stand-alone operations and maintenance manual for the pilots as assembled. The bidder shall provide a detailed description of any proposed substitutions and details of the data acquisition system and PLC hardware and software with the bid submittal package. At the discretion of the County, a phone or in-person interview may be required prior to award to ensure that minimum qualification requirements are met.

Upon Notice of Award, the selected service provider shall provide detailed design drawings of the pilot system for review and concurrence by County staff prior to initiating construction of proposed piloting facilities.

Gwinnett Pilot StudyFigure 1

Legend

PI

Turb.

ORP

Temp

pH

UV

O3

LSL

YSI

Ball valve

Globe valve

Feed pump

Peristaltic pump

pH probe

UV probe

Ozone probe

Low-level switch

YSI probe

(model TBD)

Turbidity probe

Oxidation-reduction

potential probe

Pressure indicator

Temperature probe

Static mixer

Flow meter

Water level

Sampling port

Main line

Backwash line

Air filter

PT Pressure transducer

FT Flow transducerProportional mixer

Air scouring line

Post-filter

sampling line

Air relief valve

1 Four separate lines

from feed pumps

DO DO probe

LT Level Transmitter

Bag filter

Y-strainer

Drain to sewer

Motor-operated valve

Flow totalizer

+ flow meter

Air compressor

Secondary containment

Gwinnett Reuse Pilot StudyFigure 2

Process Flow Diagram

(not to scale)

Lake Lanier

Raw Water

F. Wayne Hill

WRC Effluent

Blending Tank

Feed Pump

Backwash PumpEffluent Tank

Sewer

Ozonation Skid

Sewer

Air Scouring

Ferric Chloride Tank

Pro

port

ional

mix

er

Cationic Polymer Tank

2-Stage Rapid Mixing 3-Stage Flocculation2-Stage Coagulation

Phosphorous Amendment

TankHydrogen Peroxide Tank

Chlorine Tank

Co

nn

ecti

on

fo

r Io

n

Exch

an

ge U

nit

Chlorine Tank

SewerSewerSewerSewer

Sewer

O3 Quenching Agent Tank

GA

C filt

ter

Anth

racite filt

er

Anth

racite filt

er

Anth

racite

filt

er

Sewer

Finished Water Tank

Sewer

LT

Gwinnett Reuse Pilot StudyFigure 3

Piping and Instrument Diagram

(not to scale)

Lake Lanier

Raw Water

F. Wayne Hill

WRC Effluent

Blending Tank

Feed Pump

PI

2-Stage Coagulation and 3-Stage Flocculation Skid

Ferric Chloride Addition Cationic Polymer AdditionVent

Ozonation Skid

Phosphorous Addition Hydrogen Peroxide Addition

LSL

Backwash PumpBackwash Tank

O3

ORP

Temp pH

Turb.

UV

UV

PI

PI

FT

FT

LSL

PT

PT

PT

PT

Sewer

Tu

rb.

PT

Tu

rb.

PT

Tu

rb.

PT

Tu

rb.

Air Scouring

SP

1S

P2

SP

3

SP

4

SP5 SP6

SP

7

SP

8

SP9 SP10

SP

11

SP

12

SP

13

SP

14

SP15SP16

SP

21

Window Window Window

PI

Air Bleed

PI

M1

P1

P2

P3 P4

P5P6

P8

T1

T2 T3

T4

T5

T4 T5

T7

1 1

Se

wer

YSI

SP

22

Chlorine Addition

SP

20

P7

Chlorine Addition

SP23P9

Finished Water Tank

T10

DO

SP25

Co

nn

ec

tio

n f

or

Ion

Exch

an

ge

Un

it

Receiving Tank

SP

19

GA

C f

iltte

r

An

thra

cite filt

er

An

thra

cite filt

er

An

thra

cite filt

er

LT

LT

LT

O3

O2

Concentrator

O3 Generator

O3

Monitor

O3 Quenching

SP24

P10

AC1

O3

Destruct

Ozo

ne C

on

tacto

rs

(Sid

e S

tream

Inje

ctio

n)

UVDO

SP17

PT

SP18

Sewer

T9

T8

T6

Sewer

Gwinnett Biofiltration Pilot StudyFigure 4

Process Flow Diagram

(not to scale)

Lake Lanier

Raw Water

Blending Tank

Feed Pump

Backwash PumpEffluent Tank

Sewer

Ozonation Skid

Sewer

Air Scouring

Ferric Chloride Tank

Proportional

mixer

Cationic Polymer Tank

2-Stage Rapid Mixing 3-Stage Flocculation2-Stage Coagulation

Phosphorous Amendment

TankHydrogen Peroxide Tank

Chlorine Tank

Chlorine Tank

SewerSewerSewerSewer

Sewer

O3 Quenching Agent Tank

GA

C filt

ter

Anth

racite filt

er

Anth

racite filt

er

Anth

racite

filt

er

Sewer

Finished Water Tank

Sewer

LT

Gwinnett Biofiltration Pilot StudyFigure 5

Piping and Instrument Diagram

(not to scale)

Lake Lanier

Raw Water

Equalization

Tank

Feed Pump

PI

2-Stage Coagulation and 3-Stage Flocculation Skid

Ferric Chloride Addition Cationic Polymer AdditionVent

Ozonation Skid

Phosphorous Addition Hydrogen Peroxide Addition

LSL

Backwash PumpBackwash Tank

O3

ORP

Temp pH

Turb.

UV

UV

PI

LSL

PT

PT

PT

PT

Sewer

Tu

rb.

PT

Tu

rb.

PT

Tu

rb.

PT

Tu

rb.

Air Scouring

SP

1

SP

3

SP

4

SP5 SP6

SP

7

SP

8

SP9 SP10

SP

11

SP

12

SP

13

SP

14

SP15SP16

SP

21

Window Window Window

PI

Air Bleed

PIP1

P2

P3 P4

P6P5

P8

T1

T2 T3

T4

T5

T4 T5

T7

1 1

Sew

er

YSI

SP

22

Chlorine Addition

SP

20

P7

Chlorine Addition

SP23P9

Finished Water Tank

T10

DO

SP25

Receiving Tank

SP

19

GA

C filt

ter

Anth

racite filt

er

Anth

racite filt

er

Anth

racite

filt

er

LT

LT

LT

O3

O2

Concentrator

O3 Generator

O3

Monitor

O3 Quenching

SP24

P10

AC1

O3

Destruct

Ozo

ne

Con

tacto

rs

(Sid

e S

trea

m In

jectio

n)

DO

SP17

PT

SP18

Sewer

T9

T8

T6

Sewer


Floor Drain


Electrical Outlets & Pilot Area Layout

Electrical outlets

Table 1. Design specifications for both the DPR and biofiltration pilot plants.

Parameter Full Scale Pilot Design Criteria Unit Comments

Pilot plant flow rate 98 MGD 6 gpm Pump P1 & P2 in P&ID

Blending or Equlization tank size - >1000 gallons Tank T1 in P&ID

Ozone dose 1 up to 6 mg/L -

Contact time 38 up to 38 min -

Ozone quenching target dose - up to 6 mg/L

Ozone quenching pump rate - 1 to 100 mL/min Pump P10 in P&ID

Ozone quenching tank size 100 gallons Tank T9

Coagulant type ferric chloride ferric chloride - -

Coagulation Rapid Mix stages 2 2 stages -

Coagulation velocity gradient 1000 1000 /sec -

Coagulation mixing duration 36 36 sec -

Coagulation detention time 18 18sec per rapid mix

basin-

Coagulant final concentration (dose) 0.7 0.2 to 1.5 mg/L -

Coagulant feed pump rate - 0.1 to 5 mL/min Pump P3 in P&ID

Coagulant feed tank - 40 gallons Tank T2 in P&ID

Flocculation typeCationic polymer - Clarifloc

Polydimethylsiloxane

Cationic polymer - Clarifloc

Polydimethylsiloxane - -

Flocculation basins 3 3 stages -

Flocculation velocity gradient 20 to 100 60 /sec -

Flocculation mixing duration 8 5 to 20 min -

Flocculent final concentration (dose) 1.2 to 1.5 1.2 to 1.5 mg/L -

Flocculation feed pump rate - 0.2 to 5 mL/min Pump P4 in P&ID

Flocculation feed tank - 40 gallons Tank T3 in P&ID

Number of filters 12 4 - -

60 60 inches anthracite -

12 12 inches sand -

Surface loading rate 7.5 7.5 gpm/ft2 -

EBCT

minimum of 6 minutes at

7.6 gpm/ft2 up to 15

minutes

minimum of 6 minutes at

7.6 gpm/ft2 up to 15

minutes

-

-

Air scour rate 2 2 to 5 ACFM/ft2 Air compressor AC1 in P&ID

Air scour duration 10 up to 10 min -

Backwash rate and duration

1 min at 6.6 gpm/ft2

10 min at 25 gpm/ft2

1 min at 10.6 gpm/ft2

3 to 25 gpm/ft2 -

Pump P8 in P&ID

Backwash water tank - 100 gallons Tank T7 in P&ID

Backwash water type chlorinated

chlorinated for 3 filters

and unchlorinated for one

filter

-

-

Backwashing chemical-

12.5% sodium

hypochlorite- -

Target sodium hypochlorite dose - 0.1 to 2 mg/L -

Sodium hypochlorite feed pump rate - 0.2 to 20 mL/min Pump P7 in P&ID

Sodium hypochlorite feed tank - 50 gallons Tank T6 in P&ID

Phosphorous amendment type - 85% phosphoric acid - -

Target phosphoric acid concentration - 0.09 mg/L -

Phosphoric acid feed pump rate - 0.2 to 10 mL/min Pump P5 in P&ID

Phosphoric acid feed tank - 25 gallons Tank T4 in P&ID

Ozonation

Hydrogen Peroxide Addition

Media type

Coagulation/Flocculation

Filtration

Backwashing

Phosphorous Addition

Parameter Full Scale Pilot Design Criteria Unit Comments

Hydrogen peroxide type-

35% hydrogen peroxide - -

Target hydrogen peroxide concentration - 0.2 to 2 mg/L -

Hydrogen peroxide feed pump rate - 1 to 20 mL/min Pump P6 in P&ID

Hydrogen peroxide tank size - 100 gallons Tank T5 in P&ID

Finished water tank - 200 gallons Tank T10 in P&ID

Target sodium hypochlorite concentration - 1.8 mg/L -

Sodium hypochlorite feed pump rate - 0.2 to 5 mL/min Pump P9 in P&ID

Sodium hypochlorite feed tank - 20 gallons Tank T8 in P&ID

Finished Water Tank

addendum #4 bl086-15 purchase of a reuse water … ad4.pdfprovision of a second water treatment...

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