SEWAGE TREATMENT AN ASSESSMENT OF VARIOUS TECHNOLOGIES Dr. Ananth S. Kodavasal Ecotech Engineering Consultancy Pvt. Ltd. 1 SEWAGE TREATMENT AN ASSESSMENT OF VARIOUS TECHNOLOGIES Dr. Ananth S. Kodavasal Ecotech Engineering Consultancy Pvt. Ltd. 1 February 06, 2013

WHAT STARTED IT ALL OFF ? 1. Classical, Conventional EAAS 2. Anaerobic STP’s 3. CAACO 4. EADOX 5. SBR 6. MBBR 7. MBR 2

Classical, Conventional EAAS STP GUIDE PUBLISHED BY KSPCB STP GUIDE PUBLISHED BY KSPCB 3

ANAEROBIC STP NOT FIT FOR URBAN RES. COMPLEXES NOT FIT FOR URBAN RES. COMPLEXES Foul odour Foul odour Black colouration Black colouration Black solid particles Black solid particles Unfit for “Urban Reuse” Unfit for “Urban Reuse” 3 STP’s modified 3 STP’s modified 200 KLD ; 350 KLD ; 500 KLD 200 KLD ; 350 KLD ; 500 KLD 4

EADOX ELECTROCOAGULATION ELECTROCOAGULATION Akin to Chemical Coagulation Akin to Chemical Coagulation Removes only solids/ colloids Removes only solids/ colloids Does not remove dissolved organics Does not remove dissolved organics Unsustainable electrode costs Unsustainable electrode costs 6 STP’s studied – All defunct 6 STP’s studied – All defunct 6

SBR SEQUENCING BATCH REACTOR SEQUENCING BATCH REACTOR No problems with Technology No problems with Technology Issues with Design, Engineering Issues with Design, Engineering Issues with critical, Mandatory Equipment Issues with critical, Mandatory Equipment Issues related to sludge handling Issues related to sludge handling Min. Guidelines for Design, Engg. submitted Min. Guidelines for Design, Engg. submitted 7

SEQUENCE OF OPERATIONS

MOTORISED DECANTER

MBBR MOVING BED BIOFILM REACTOR MOVING BED BIOFILM REACTOR No problems with Technology No problems with Technology Issues with Design, Engineering Issues with Design, Engineering Issues related to primary sedimentation Issues related to primary sedimentation Issues related to sludge handling Issues related to sludge handling Min. Guidelines for Design, Engg. submitted Min. Guidelines for Design, Engg. submitted 8

FLOWSHEET 1

PLASTIC CARRIER MEDIA 1

MBR MEMBRANE BIOREACTOR MEMBRANE BIOREACTOR Emerging Technology ( of future) Emerging Technology ( of future) High operating costs High operating costs Several unresolved issues Several unresolved issues Subject of serious R&D Subject of serious R&D Not suitable for India under present state of development Not suitable for India under present state of development 8

FLOWSHEET 1

TYPICAL MEMBRANE CASSETTES

Contd.

SUMMARY, CONCLUSION From a long term perspective, EAAS is still the Best Available, Practicable Technology From a long term perspective, EAAS is still the Best Available, Practicable Technology Anaerobic, CAACO, EADOX unsuitable Anaerobic, CAACO, EADOX unsuitable SBR may be considered with T&C ## SBR may be considered with T&C ## MBBR may be considered with T&C ## MBBR may be considered with T&C ## MBR is for the future, when all current issues are resolved MBR is for the future, when all current issues are resolved ## Pls. see Guidelines submitted to KSPCB ## Pls. see Guidelines submitted to KSPCB 9

THANK YOU THANK YOU FOR YOUR TIME AND FOR YOUR TIME AND PATIENT HEARING PATIENT HEARING Dr. Ananth S Kodavasal Feb. 06, 2013