Water Technologies

OMNIFLO® SBR Proven Performance UnderDemanding Conditions

2

Superior Technology in Wastewater Treatment

The OMNIFLO® Sequencing Batch Reactor (SBR) utilizesstate-of-the-art equipment and controls to deliver superiorperformance under the most demanding conditions, whileoffering important benefits to plant owners and operators.

Operating PrincipalsThe OMNIFLO® SBR is a fill-and-draw, non-steady state activatedsludge process in which one or more reactor basins are filledwith wastewater during a discrete time period, and thenoperated in a batch treatment mode. In a single reactor basinthe OMNIFLO® SBR accomplishes equalization, aeration, andclarification in a timed sequence. In a conventional continuousflow process, multiple structures are required to obtain thesame treatment objectives.

A single cycle for each reactor consists of five discrete periods,Fill, React, Settle, Decant, and Idle. The OMNIFLO® SBR systemis unique in its ability to handle influent flows and a wide rangeof organic loads and industrial pollutants. The OMNIFLO® SBR isideally suited when nitrification, denitrification and biologicalphosphorous removal are necessary.

The operating strategy provides process control over a widerange of flows. By varying the operating strategy, aerobic oranoxic conditions can be achieved to encourage the growth ofdesirable microorganisms. Microorganisms can also beacclimated to a wide range of industrial and chemicalprocessing wastes.

OMNIFLO® SBR CycleAnoxic Fill Phase During Anoxic Fill influent is distributed throughout the settledsludge through the Influent Distribution/Sludge CollectionManifold (ID/SC) and biodegration is initiated. The reactor isfilled with wastewater and fill can be aerated, anoxic, or acombination of aerated and anoxic.

React Phase Influent flow is terminated. Aeration and mixing continue in thefull reactor until complete biodegration is achieved.

Settle Phase Aeration and mixing are turned off and perfect quiescentconditions allow the biomass to settle, leaving the treatedsupernatant above.

Decant PhaseEffluent is removed from just below the liquid surface by theFloating Solids Excluding Decanter.

Idle/Waste Sludge Phase The reactor waits to receive flow. Settled sludge is drawnthrough the ID/SC and removed from the SBR reactor.

OMNIFLO® SBR Benefits� Biological Nutrient Removal (BNR)� High quality effluent at widely varying flows and loadings� No sludge recycle system� Perfect quiescent settling� Optimum energy efficiency� No clarifiers� No short circuiting� Small footprint� Flexible design� Retrofits of existing tanks� Biological phosphorous removal

OMNIFLO® SBR Cycle

3

OMNIFLO® SBR System Controls The heart of the OMNIFLO® SBR is the control system. Thecontrol system focuses on an operating strategy that optimizesthe SBR process capabilities while minimizing required operatortime and decision making. We currently offer three types ofcontrol systems:

Flow Proportional Control – This state-of-the-art controlsystem features a PLC with a simple to use operator interface.Pressure transducers are used to continuously monitor the rateof fill in each SBR reactor. As the flow changes, the aeration timeis adjusted proportional to the flow. This strategy ensures thatoxygen is available when needed, but does not waste powerduring low flow periods. The flow proportional control systemalso provides automatic alarm and failure response. Forexample, if an influent valve fails to open, the influent pumpstation would be pumping against a closed valve. This featurewould place the affected reactor out of service and divert theflow to another in-service basin until the failure is manuallyacknowledged and corrected. The controls adjust the operatingstrategy and setpoints to provide optimal treatment with theremaining reactors.

Float and Timer Based Control – The float and timer basedcontrol strategy is based primarily on predetermined cycle timeswith level override. This system features standard processcontrol parameters without the benefits of our flowproportional aeration or automatic response.

Slug Feed Control – The slug feed control strategy utilizesintermittent, rapid fill periods, which maximizes availableaeration time during each cycle. This PLC based control systemis applicable for treatment plants that have adequate influentholding capacity (influent equalization basin) prior to the SBR.

OMNIFLO® SBR Control Features � Reduction of operator time (fully automated)� Consistent, efficient process � Additional PC/SCADA systems (optional)� Equipment failure alarms and automated responses� Phone modem for remote process service capability

(standard)� Continuous liquid level indication (standard on flow

proportional)� D.O. control (optional)� Surge protection� Flexibility for operator to change set points

State-of-the-art OMNIFLO® SBR controls

4

Superior Equipment for Process Performance

Jet Aeration DesgnsThe VARI-CANT® jet aeration system from Siemens utilizesproven principles of jet aeration, combined with state-of-the-artdesign and materials, resulting in a system with superiorperformance, efficiency and trouble-free operation. The jetaeration system operates by intermixing air with a motive liquidand injecting the stream into the wastewater. The motive liquid– recirculated mixed liquor – is discharged from an inner nozzleinto an outer nozzle. Compressed atmospheric air is introduced,and sheared into tiny bubbles which are entrained in the motiveliquid stream and injected back into the basin.

Diffused Aeration DesignsWe offer both fine and coarse bubble SBR installations withfixed and retrievable diffuser assemblies available. Most fineand coarse bubble designs used in SBR’s require some sort ofmixing device to achieve complete mix in the basin duringaeration. OMNIFLO® SBR systems are designed without amixing device when the density of the diffusers achieve fullfloor coverage and the ID/SC manifold is used to distribute theinfluent evenly across the basin floor. Reliable and durablefloating surface aerators and mixers are also available forspecial applications with SBR technology.

VARI-CANT® Jet Aeration System

OMNIFLO® SBRwith Fine BubbleDiffusers

OMNIFLO® SBR with Fine Bubble Diffusers

Aeration/ Mixing Options� Full floor coverage with fine & coarse

bubble diffusers� High-speed floating aerators� Fixed fine and coarse bubble diffusers with

mixers� Mixers� Jets with submersible or dry pit pumps� Jets with propeller pump and column

arrangement� Retrievable fine and coarse bubble

diffusers with mixers

5

Influent Distribution/ Sludge CollectionManifold (ID/SC)The ID/SC manifold allows intimate contact ofthe influent (food) with the settled biomass inthe sludge blanket throughout the length of thebasin. During this time, the soluble BOD isabsorbed and stored by the facultative biomassuntil air is received to metabolize the food. Theselective pressures exerted on the biomassassists in good settling and facultativeorganisms to predominate. The ID/SC manifoldis also used to withdraw sludge from multiplepoints across the basin floor. This yields thethickest sludge possible, reducing side streamsludge treatment operation and maintenance.Finally, the ID/SC prevents disruption of thesludge blanket during Filled Decant periodsnecessitated by high flow rates or emergencysingle tank operation.

OMNIFLO® SBR Key Advantages� Licensed plant operators available for customer service

24 hrs/day, 7 days/week� Choice of aeration / mixing devices� Influent distribution / sludge collection manifold (ID/SC)� Non-Electro mechanical solids excluding floating

decanter� State-of-the-art controls� Retrofits available for any basin geometry� Experience, Reputation, & Reliability

Influent Distribution Manifold

6

Floating Solids Excluding DecanterOur floating solids excluding decanter is the only true solidsexcluding decanter in the industry that does not utilize electro-mechanical equipment in the basin. This state-of-the-art designutilizes multiple orifices to keep velocities at a minimum, andpulls treated effluent from below the surface to eliminate thepossibility of entraining floatables. Our decanters areconstructed of high quality, durable, corrosive resistantmaterials with a manual override that is unique in the industryand requires no routine maintenance.

Fixed DecanterThe fixed decanter operates similarly to the floating decanter,except it is attached to the basin wall at a fixed elevation belowthe bottom water level. This eliminates the flexible hoseconnector, knee brace and decanter rest support. In SBRsystems, the fixed decanter requires the availability of a longersettling time since the solids must settle below the bottomwater level before decanting.

Non Solids Excluding DecanterThe non solids excluding decanter is constructed similarly to thesolids excluding decanter, however it does not contain thespring loaded valves. This type of decanter is installed inapplications when it is not important if some solids are left inthe decanted effluent.

Draw tube with solids excluding plug valves.Floating solids excluding decanter

Our decanters are constructed of high quality, durable,corrosive resistant materials with a manual override that isunique in the industry and requires no routine maintenance.

Decanter Advantages� Innovative design, engineered specifically for each

project.� Simple safe operation� No in-basin electromechanical devices requiring

maintenance� Consistent quality performance� Years of reliable operating experience in the field

with installations worldwide

Pima Utility The Pima Utility Wastewater Treatment Plant located in aretirement community in Arizona was designed to treat 2.4million gallons per day (MGD), and produce a high qualityeffluent with disinfection, low turbidity and nitrogen levels tomeet Title 22 effluent quality standards. The rectangularprocess basins were designed to be low profile and covered forenvironmental aesthetics with mechanical equipment installedin an enclosed building to eliminate any noise.

Rahr MaltingThe Rahr Malting Company located in Shakopee, MN is one of theworld’s largest malt producers. Since 1999, an OMNIFLO® SBRhas been installed which has consistently met their wastewatertreatment requirements. The Rahr Malting Co., also worked withthe Minnesota Pollution Control Agency in cleaning up the riverwhere the wastewater effluent is discharged to make sure oxygenconsuming compounds were removed

Fruitland, Maryland The City of Fruitland, Maryland installed an OMNIFLO® SBRsystem to expand its capacity of its wastewater treatment plantand to meet the requirements for the Chesapeake Bay initiative.The OMNIFLO SBR system was selected because of its compactfootprint and ability to achieve enhanced nutrient removalwithin a two-tank layout. This system also includes thepatented VARI-CANT® Jet Aeration system from Siemens as well

as a SCADA monitoring and controls systems. The system went on line in December 2002 and has been successful inmeeting nitrogen levels less than 3 mg/ and phosphorus levelsless than 1 mg/l.

7

Proven Technology and Experience

Pima Utility Wastewater Treatment Plant OMNIFLO® SBR installed at Rahr Malting

OMNIFLO® SBR Primary Markets� Municipal� Food & Beverage� Pulp & Paper� Petrochemical & Oil Refining� Pharmaceutical� Chemical / CPI� Landfill /Leachate Applications� Textile Industry

Fruitland, Maryland Wastewater Treatment Plant

OMNIFLO and VARI-CANT are registered trademarks ofSiemens, its subsidiaries or affiliates. Equipment andfeatures described are protected under U.S. Patents4,648,967; 4,645,592, 4,711,716, 4,724,073, 4,775,467,and other Patents Pending and issued.

The information provided in this brochure containsmerely general descriptions or characteristics ofperformance which in actual case of use do not alwaysapply as described or which may change as a result offurther development of the products. An obligation toprovide the respective characteristics shall only exist ifexpressly agreed in the terms of contract.

Tel: 913.422.7600Fax: 913.422.7667jettech.water@siemens.com

JT-SBRdr-BR-0508

Subject to change without prior notice.

©2008 Siemens Water Technologies Corp.

www.siemens.com/water