wwtp tour guide updated
TRANSCRIPT
Wastewater Treatment Plant Tour
DIVISION OF ADMINISTRATIONUTILITIES & ENERGY SERVICES
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Texas A&M Wastewater Treatment PlantProviding a Cleaner Environment Through Water and Bio-solids Recycling
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Texas A&M Wastewater Treatment PlantProviding a Cleaner Environment Through Water and Bio-solids Recycling
Plant Overview
Texas A&M Wastewater Treatment Plant (WWTP) is a conventional activated sludge treatment facility.
Treatment of wastewater can be divided into four major groups:
Preliminary treatment Primary treatment Secondary treatment Sludge treatment and disposal
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Design Criteria Designed to treat 11,700 lb. BOD/day on a maximum monthly avg basis.
(This is a population equivalent of 69,900 persons) Load to the plant varies in proportion to the number of people on
campus
Texas A&M Wastewater Treatment PlantProviding a Cleaner Environment Through Water and Bio-solids Recycling
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Texas A&M Wastewater Treatment Plant
Unit Operations and Processes Bar Screen/Flow Metering/Influent Lift Station Grit Removal Facility Aeration Blower Building Aeration Basins Primary and Secondary Clarifiers, Sludge Pump Stations, Sludge
Thickeners, Anaerobic Digesters, Holding Tanks, and Pumping Stations
Providing a Cleaner Environment Through Water and Bio-solids Recycling
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Vortex Grit Removal SystemGrit
Heavy mineral matter found in wastewater
Will not decompose in the treatment process
Includes sand, gravel, cinder, or other solid materials that are heavier than the organic biodegradable solids in the wastewater.
Removal of grit prevents
unnecessary abrasion and wear of mechanical equipment
deposition in pipelines and channels accumulation of grit in anaerobic
digesters and aeration basins
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Primary Clarifier
Primary clarifiers are designed to provide a quiescent volume where solids are allowed to settle by gravity over a relatively long period of time (usually 2 to 4 hours).
Gravity provides a natural separation of solids and liquid in the clarifier tank.
The “clarified” liquid then flows from the primary clarifier to further treatment called secondary or biological treatment
WWTP houses 2 60’ x 10’ tanks
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Primary Pump Station
3 primary pumps transfer sludge to thickeners
2 thickener pumps transfer sludge to primary anaerobic digester
Vogelsang Rotary Lobe Pumps rated at 120 GPM
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WWTP houses two 70’ x 16’ tanks
Secondary ClarifierThe basic purpose of the secondary clarifiers is to separate solids from liquids through the process of gravity sedimentation.
The mixed liquid from the solids contact basins flows into the center of the secondary clarifier tanks through a vertical inlet pipe.
The well serves two main purposes.
It directs flow downward in a vertical flow pattern to minimize short circuiting.
Serves as a stilling basin that promotes flocculation and settling of solids.
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Secondary Pump Station
Transfer settled sludge from secondary clarifiers to aeration basin to prevent sludge accumulation and to reseed micro-organisms in aeration basin.
3 Return Activated Sludge Pumps rated at 1200 GPM
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Ultraviolet Disinfection
An ultraviolet (UV) disinfection system transfers electromagnetic energy from a mercury arclamp to an organisms genetic material, destroying the cells ability to reproduce.
Each of these systems provides dosage of 250 Mw-s/cm2
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Aeration Blowers
Introduces air into a liquid, providing an aerobic environment for microbial degradation of organic matter.
THE PURPOSE OF AERATION IS TWO-FOLD:
To Supply the required oxygen to the metabolizing microorganisms
To provide mixing so that the microorganisms come into contact with the dissolved and suspended organic matter
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Land Application of BiosolidsUTILIZE 60 ACRES LOCATED ADJACENT
TO THE WASTEWATER TREATMENT PLANT
TO INJECT BIOSOLIDS
Terragator Model 2204 Capacity 2200 gallon tank
RECYCLING BIOSOLIDS THROUGH LAND APPLICATION SERVES SEVERAL PURPOSES.
Improves soil properties such as texture and water holding capacity.
Supplies nutrients essential for plant growth, including nitrogen and phosphorous, as well as some essential micro-nutrients such as nickel, zinc and copper.
Serves as an alternative or substitute for expensive chemical fertilizers.
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Wastewater Laboratory
BOD5 & TSS-Daily Avg. 20 mg/l7 Day Avg. 30 mg/lDaily Max 45 mg/l
E-ColiDaily Avg. 126Daily Max 394
Ammonia NitrogenDaily Avg. 12 mg/l
Ph – not less than 6.0 nor greater than 9.0Minimum D.O. 2.0 mg/lFlow- 4.0 MGP; 2 hr. peak flow 9.0 MGD
ENSURES REGULATORY COMPLIANCE GOVERNED BY TCEQ
Testing Includes:
Wastewater Treatment Plant Tour
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