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Wwtp tour guide updated


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Wwtp tour guide updated

  2. 2. Texas A&M Wastewater Treatment Plant Providing a Cleaner Environment Through Water and Bio-solids Recycling 2
  3. 3. Texas A&M Wastewater Treatment Plant Providing 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 3
  4. 4. Texas A&M Wastewater Treatment Plant Providing a Cleaner Environment Through Water and Bio-solids Recycling 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 4
  5. 5. Texas A&M Wastewater Treatment Plant Providing a Cleaner Environment Through Water and Bio-solids Recycling 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 5
  6. 6. 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 7
  7. 7. 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 8
  8. 8. 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 9
  9. 9. Secondary Clarifier The 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. WWTP houses two 70’ x 16’ tanks 11
  10. 10. Secondary Pump StationTransfer settled sludge from secondaryclarifiers to aeration basin to preventsludge accumulation and to reseed micro-organisms in aeration basin. 3 Return Activated Sludge Pumps rated at 1200 GPM 12
  11. 11. 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 13
  12. 12. 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 15
  13. 13. Land Application of Biosolids UTILIZE 60 ACRES LOCATED ADJACENT TO THE WASTEWATER TREATMENT PLANT TO INJECT BIOSOLIDS Terragator Model 2204 Capacity 2200 gallon tank RECYCLING BIOSOLIDS THROUGH LANDAPPLICATION 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. 16
  14. 14. Wastewater Laboratory ENSURES REGULATORY COMPLIANCE GOVERNED BY TCEQTesting Includes:  BOD5 & TSS- Daily Avg. 20 mg/l 7 Day Avg. 30 mg/l Daily Max 45 mg/l  E-Coli Daily Avg. 126 Daily Max 394  Ammonia Nitrogen Daily Avg. 12 mg/lPh – 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 17
  15. 15. Wastewater Treatment Plant Tour 19