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Wwtp tour guide updated Wwtp tour guide updated Presentation Transcript

  • Texas A&M Wastewater Treatment Plant Providing a Cleaner Environment Through Water and Bio-solids Recycling 2
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • Wastewater Treatment Plant Tour 19