STP in Residential complexes

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Presentation on Waste water Management in Residential complexes by Dr.Anant , Ecotech engineering , in Estate Manager Workshop-II conducted by ApartmentAdda.com on 18th Nov 2010 in Bangalore.

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STP in Residential complexes

  1. 1. SEWAGE TREATMENT PLANTSIN RESIDENTIAL COMPLEXES Dr. Ananth S. KodavasalEcotech Engineering Consultancy Pvt. Ltd.
  2. 2. CONTENTS1. WASTEWATER POLLUTANTS/ IMPACT2. TYPICAL STP FOR A RESIDENTIAL COMPLEX3. THREE RULES FOR A GOOD STP - PROPER DESIGN - PROPER ENGINEERING - PROPER OPERATION & MAINTENANCE 2
  3. 3. 1. WASTEWATER POLLUTANTS/ IMPACT WHY WASTEWATER TREATMENT ?- COMPLIANCE WITH LAW !!!- RESOURCE RECOVERY – WATER IS PRECIOUS !- IMPROVED SURFACE/ GROUND WATER QUALITY- IMPROVED PUBLIC HEALTH- IMPROVED FLORA & FAUNA- LONG TERM SUSTAINABILITY 3
  4. 4. POLLUTING INDUSTRIES / ACTIVITIESDOMESTIC ( BPO/ SOFTWARE, RESIDENTIAL)METALS / MINERALS PROCESSINGFOOD PROCESSING INCL. FERMENTATIONOIL & PETROCHEMCALSCHEMICALS, BULK DRUGSTEXTILESPULP & PAPERETC., ETC. 4
  5. 5. TYPES & EFFFECTS OF POLLUTIONO&G : TREATMENT EFICIENCY AESTHETICSHEAVY METALS : TOXICITYORGANIC CMPDS. : TOXICITYBOD/ COD : OXYGEN DEPLETIONN, P : EUTROPHICATIONPATHOGENS : DISEASES 5
  6. 6. THREE CARDINAL RULES FOR A GOOD WWT PLANTPROPER DESIGN OF TRTMNT PLANTPROPER ENGG. OF TRTMNT PLANTPROPER O&M OF TREATMENT PLANT 6
  7. 7. SOME PHYSICAL CHARACTERISTICSpHCOLOURODOURTURBIDITYSOLIDS – SUSPENDED/ DISSOLVEDTEMPERATURE 7
  8. 8. SOME CHEMICAL CHARACTERISTICSORGANIC CONTENTSPECIFIC ORGANIC COMPOUNDSTOXIC COMPOUNDSHEAVY METALSREACTIVITY( CONVENTIONAL MEASURES SUCH AS COD TOD, TOC ) 8
  9. 9. WASTEWATER QUANTITY,DISCHARGE PATTERN• DAILY AVERAGE• HOURLY AVG./ PEAK HOUR•CONTINUOUS / INTERMITTENT 10
  10. 10. BASIC BIOLOGICAL REACTION IN STPFOOD MICRO O2 BES + ENERGY + GASESNUTR. MORE + PRODUCTS MICROBES 10
  11. 11. 2. TYPICAL DESIGN OF A GOOD STPTREATMENT UNITS , PROCESSES SCREENING, GRIT REMOVAL O&G REMOVAL EQUALISATION/ HOMOGENISATION AERATION SETTLING & SLUDGE RECIRCULATION FILTRATION ( SAND FILTER + CARBON FILTER) DISNFECTION ( CHLORINATION) EXCESS SLUDGE DEWATERING, DISPOSAL 11
  12. 12. DESIGN BASIS FOR BIOLOGICAL TREAMTMENTAEROBIC TREATMENT• pH• TEMPERATURE• FOOD• OXYGEN REQUIREMENTS• TYPE OF WASTE• FOOD TO MICROORGANISMS ( F/M) 12
  13. 13. • SLUDGE AGE• MLSS LEVEL• SLUDGE RETURN RATE• EXCESS SLUDGE PRODUCTION• DISSOLVED OXYGEN LEVEL• MIXING IN AERATION TANK• SETTLING CHARACTERISTICS OF SLUDGE•TYPE OF MICROORGANISMS 13
  14. 14. TYPICAL INTEGRATION OF TREATMENT UNITS/STAGES• PRELIMINARY TREATMENT• PRIMARY TREATMENT• SECONDARY TREATMENT• TERTIARY TREATMENT 14
  15. 15. TYPICAL FLOWSHEET OF STP SCREEN GRIT/GRSE EQLSTN PR. TRTMENT SEC. CLRFR AER. TANK SEC. TRTMENT SAND FILTER AC FILTER SLDGE HNDLNG CHLORINE TERT. TRTMENT 15
  16. 16. 4. OPERATION & MAINTENANCEPROBLEMSSCREEN : CLOGGING, ODOURGRIT CHAMBER : POOR SEPARATIONPRMRY CLRFIER : FLOATING SLUDGE LOW SOLIDS IN SLUDGEAERATION TANK : FOAMING, MIXING, OVER/ UNDER AERATIONSEC. CLRFIER : BULKING SLUDGE PIN POINT FLOCS 16
  17. 17. SEC. CLRFIER : NO CLARITY IN WATER POOR SLUDGE SETTLINGPR. SAND FILTER : INSUFFICIENT CLARITY BACK PRESSURE HIGHACT. CARB. FLTR : NO IMPROVEMENTSTP OPERATOR : UNTRAINED UN MOTIVATED UN SUPERVISED INDISCPLINEDDESIGN FAULTS : REDESIGN/ REENGINEER 17
  18. 18. KSPCB COMPLIANCESFORM 1 – AIR CONSENT : ANNUALFORM 13 – WATER CONSENT : ANNUALFORM V - ENV. STATEMENT : ANNUALFORM 1 - CESS RETURNS : MONTHLYFORMS UNDER HWM RULES , AUTHORISATIONFORMS UNDER BATTERY RULES 18
  19. 19. ECOTECH COMPANY PROFILE•ESTABLISHED IN 1986•DESIGN, ENGINEERING OF TREATMENT PLANTS•COMMISSIONING, UPGRADATION, O&M•REIA, WATER, WASTEWATER, ETP AUDIT•OVER 500 PROJECTS HANDLED ALL OVER INDIA•OVER 75 O&M AMC CONTRACTS AT PRESENT•QUALIFIED, EXPERIENCED AND DEDICATED STAFF•3 ENV. SCIENTISTS/ ENGINEERS•5 FIELD, QUALITY & TRAINING OFFICERS•8 MECHANICS/ ELECTRICIAN / WELDERS•OVER 75 EXPERIENCED SUPERVISORS
  20. 20. THANK YOUECOTECH ENGG. CONSULTANCY PVT LTD

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