This SlideShare is about Sewage Treatment Plants in Residential Complexes presented by Dr.Ananth S Kodavasal, Ecotech engineering in "Estate Manager Workshop-II" conducted by ApartmentADDA on 18th Nov 2010 in Bangalore. It explains the below topics • Wastewater Pollutants/Impact • Physical, Chemical, Biological Unit Operations • Types & Effects of Pollution • Biological Treatment Variants • Pros and Cons At last the SlideShare details on the Important Acts and rules related to Environmental Protection. Check the link below for details http://apartmentadda.com/blog/water-workshop-for-apartments-report/

1. SEWAGE TREATMENT PLANTS
IN RESIDENTIAL COMPLEXES
Dr. Ananth S. Kodavasal
Ecotech Engineering Consultancy Pvt. Ltd.

2. CONTENTS
1. WASTEWATER POLLUTANTS/ IMPACT
2. TYPICAL STP FOR A RESIDENTIAL COMPLEX
3. THREE RULES FOR A GOOD STP
- PROPER DESIGN
- PROPER ENGINEERING
- PROPER OPERATION & MAINTENANCE
2

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. POLLUTING INDUSTRIES / ACTIVITIES
DOMESTIC ( BPO/ SOFTWARE, RESIDENTIAL)
METALS / MINERALS PROCESSING
FOOD PROCESSING INCL. FERMENTATION
OIL & PETROCHEMCALS
CHEMICALS, BULK DRUGS
TEXTILES
PULP & PAPER
ETC., ETC. 4

5. TYPES & EFFFECTS OF POLLUTION
O&G : TREATMENT EFICIENCY
AESTHETICS
HEAVY METALS : TOXICITY
ORGANIC CMPDS. : TOXICITY
BOD/ COD : OXYGEN DEPLETION
N, P : EUTROPHICATION
PATHOGENS : DISEASES
5

6. THREE CARDINAL RULES
FOR A GOOD WWT PLANT
PROPER DESIGN OF TRTMNT PLANT
PROPER ENGG. OF TRTMNT PLANT
PROPER O&M OF TREATMENT PLANT
6

7. SOME PHYSICAL CHARACTERISTICS
pH
COLOUR
ODOUR
TURBIDITY
SOLIDS – SUSPENDED/ DISSOLVED
TEMPERATURE
7

8. SOME CHEMICAL CHARACTERISTICS
ORGANIC CONTENT
SPECIFIC ORGANIC COMPOUNDS
TOXIC COMPOUNDS
HEAVY METALS
REACTIVITY
( CONVENTIONAL MEASURES SUCH AS COD
TOD, TOC )
8

9. WASTEWATER QUANTITY,
DISCHARGE PATTERN
• DAILY AVERAGE
• HOURLY AVG./ PEAK HOUR
•CONTINUOUS / INTERMITTENT
10

10. BASIC BIOLOGICAL REACTION IN STP
FOOD
MICRO
O2 BES + ENERGY
+ GASES
NUTR.
MORE + PRODUCTS
MICROBES
10

11. 2. TYPICAL DESIGN OF A GOOD STP
TREATMENT 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. DESIGN BASIS FOR BIOLOGICAL TREAMTMENT
AEROBIC TREATMENT
• pH
• TEMPERATURE
• FOOD
• OXYGEN REQUIREMENTS
• TYPE OF WASTE
• FOOD TO MICROORGANISMS ( F/M)
12

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. TYPICAL INTEGRATION OF TREATMENT UNITS/
STAGES
• PRELIMINARY TREATMENT
• PRIMARY TREATMENT
• SECONDARY TREATMENT
• TERTIARY TREATMENT
14

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. 4. OPERATION & MAINTENANCE
PROBLEMS
SCREEN : CLOGGING, ODOUR
GRIT CHAMBER : POOR SEPARATION
PRMRY CLRFIER : FLOATING SLUDGE
LOW SOLIDS IN SLUDGE
AERATION TANK : FOAMING, MIXING,
OVER/ UNDER AERATION
SEC. CLRFIER : BULKING SLUDGE
PIN POINT FLOCS 16

17. SEC. CLRFIER : NO CLARITY IN WATER
POOR SLUDGE SETTLING
PR. SAND FILTER : INSUFFICIENT CLARITY
BACK PRESSURE HIGH
ACT. CARB. FLTR : NO IMPROVEMENT
STP OPERATOR : UNTRAINED
UN MOTIVATED
UN SUPERVISED
INDISCPLINED
DESIGN FAULTS : REDESIGN/ REENGINEER
17

18. KSPCB COMPLIANCES
FORM 1 – AIR CONSENT : ANNUAL
FORM 13 – WATER CONSENT : ANNUAL
FORM V - ENV. STATEMENT : ANNUAL
FORM 1 - CESS RETURNS : MONTHLY
FORMS UNDER HWM RULES , AUTHORISATION
FORMS UNDER BATTERY RULES
18

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. THANK YOU
ECOTECH ENGG. CONSULTANCY PVT LTD