WWTP working principle (optimisation and design).ppt

WWTP working principle (optimisation and design).ppt

1. Optimisationof Design &
Technology for Sewage Treatment
by
Vinita Dhupkar
21
st
February, 2014
National Conference on Energy &
Environment

2. Contents
•WaterStress
•SewageGeneration&Treatment
•SewageTreatment–TechnologyOptions
•OverviewofTechnologies
•TechnologyComparison&Assessment
•TechnologySelection
•WayForward

3. Global Water withdrawal

4. Water Stress
Yesterday :WaterPollution
Today :WaterStress
Tomorrow :WaterScarcity

5. Water Stress
•GrowingPopulation
•IncreasingUrbanisation
•InsufficientInfrastructure
•OverExtractionofGroundwater
•PoorTreatment&Maintenance
•IncreasingGapbetweenDemand&Supply

6. Sewage Generation & Treatment
0
10000
20000
30000
40000
50000
60000
Metropolitan Class I Class II Total
Sewage generation, MLD
Sewage treatment, MLD
Ref:CPCBReportonPerformanceEvaluationofSTPs,2013

7. Sewage generation & Treatment
MetropolitanCities ClassICities ClassIICities
Ref:CPCBReportonPerformanceEvaluationofSTPs,2013

8. Sewage generation & Treatment

9. STP –Technology Options
Option1: ACTIVATEDSLUDGEPROCESS(ASP/EA)
Option2: MOVINGBEDBIOREACTOR(MBBR)/FIXED
AERATEDBIOREACTOR(FAB)
Option3: SEQUENTIALBATCHREACTOR(SBR)
Option4: MEMBRANE BIOREACTOR(MBR)
Option5: UPFLOWANAEROBICSLUDGEBLANKET
(UASB)REACTOR
Option6: TRICKINGFILTER(TF)

10. ASP-Flow Diagram
AERATION TANK
SECONDARY
CLARIFIER
TREATED
WATER
DISINFECTION
CHLORINE
SLUDGE DRYING BEDS FILTRATE TO AERATION TANK
SCREENING
GRIT REMOVAL
GRIT
RAW
SEWAGE INLET CHAMBER
RAW SEWAGE
PUMPING STATION
AT-SC-CHL

11. ASP -Flow Diagram
AERATION TANK
SECONDARY
CLARIFIER
TREATED
WATER
DISINFECTION
CHLORINE
SLUDGE DRYING BEDS
FILTRATE TO AT
SCREENING
GRIT REMOVAL
GRIT
RAW
SEWAGE
PRIMARY CLARIFIER
RAW SEWAGE INLET
CHAMBER
SLUDGE STABILISATION
SLUDGE THICKNER
PC-AT-SC-CHL

12. ASP

13. ASP

14. MBBR -Flow Diagram
AERATION TANK (MBBR)
SECONDARY
CLARIFIER
TREATED
WATER
DISINFECTION
CHLORINE
SLUDGE DRYING BEDS FILTRATE TO AERATION TANK
SCREENING
GRIT REMOVAL
GRIT
RAW
SEWAGE
RAW SEWAGE INLET
CHAMBER
MBBR-SC-CHL

15. MBBR

16. FAB -Flow Diagram
SECONDARY
CLARIFIER
TREATED
WATER
DISINFECTION
CHLORINE
SLUDGE DRYING BEDS FILTRATE TO AERATION TANK
SCREENING
GRIT REMOVAL
GRIT
RAW
SEWAGE
RAW SEWAGE INLET
CHAMBER
AERATION TANK (FAB)
FAB-SC-CHL

17. SCREENING
GRIT REMOVAL
GRIT
TREATED
WATER TO
DIPSOSAL
SBR -2
INLET
CHAMBER
SLUDGE
SUMP
CHLORINE CONTACT TANK
CENTRIFUGE
(SLUDGE DEWATERING)
RETURN SLUDGE
SURPLUS SLUDGE
BLOWER
CHLORINE
SLUDGE
PUMP
RAW
SEWAGE
DECANTERDIFFUSERS
BLOWER
SBR -1
SBR -Flow Diagram
SBR-CHL

18. SBR
SBR

19. SBR

20. MBR-Flow Diagram
TREATED
WATER
DISINFECTION
CHLORINE
SLUDGE DRYING BEDS FILTRATE TO AERATION TANK
SCREENING
GRIT REMOVAL
GRIT
RAW
SEWAGE
RAW SEWAGE INLET
CHAMBER
MBR TANK
MBR-CHL

21. MBR
MBR

22. UASB -Flow Diagram
AERATION TANK / FACULTATIVE LAGOON
SECONDARY
CLARIFIER
TREATED
WATER
DISINFECTION
CHLORINE
SLUDGE DRYING BEDS
FILTRATE TO AT
SCREENING
GRIT REMOVAL
GRIT
RAW
SEWAGE
RAW SEWAGE INLET
CHAMBER
GAS HOLDER
SLUDGE THICKNER
UASB
GAS
ENGINE
ELECTRICITY
UASB-AT-SC-CHL

23. UASB

24. TRICKLING FILTER -Flow Diagram
AERATION TANK
SECONDARY
CLARIFIER
TREATED
WATER
DISINFECTION
CHLORINE
SLUDGE DRYING BEDS
FILTRATE TO AT
SCREENING
GRIT REMOVAL
GRIT
RAW
SEWAGE
RAW SEWAGE INLET
CHAMBER
SLUDGE THICKNER
TRICKLING FILTER
TF-AT-SC-CHL

25. Trickling Filter

26. Technology Comparison
Parameter UASB+EA ASP-EA MBBR MBR SBR
BOD, mg/l <30 <30 <20-30 <3-<5 <5
COD, mg/l <250 <250 <250 <100 <100
TSS, mg/l <100 <100 <100 <5 <10
TKN &P, mg/l No
Treatment
No
Treatment
No
Treatment
No
Treatment
<10
<2
Area, Acres 15.6 10.9 5.5 5 6.3
Capital Cost, Rs.
Lac (100MLD)
6500 6000 7000 25000 8000
Power cost,
Rs/m3
1.11 1.71 1.8 3.0 1.14
Chemical Cost 0.07 0.07 0.07 0.50 0.06
Maintenance
cost, Rs./m3
0.22 0.22 0.25 1.1 0.27
Power generation Yes Nil Nil Nil Nil

27. Technology Comparison0
5
10
15
20
UASB ASP MBBR MBR SBR
Area, Acres
Area, Acres 0
50
100
150
200
250
300
Capital Cost, Crs(100MLD)
UASB
ASP
MBBR
MBR
SBR

28. Technology Comparison0
0.5
1
1.5
2
2.5
3
Power, Rs/m3
UASB
ASP
MBBR
MBR
SBR 0
0.2
0.4
0.6
0.8
1
1.2
UASB ASP MBBR MBR SBR
Maintenance cost,Rs./m3

29. Technology Comparison
Treated Sewage Parameters

30. Technology Assessment for Sewage Treatment
Criteria
OP ASP MBBR SBR MBR
UASB
+ASP
TF +
ASP
Quality of Treated Effleunt
Nutrient Removal potential
Low Land Requirement potential
Low Capital Cost potential
Low Power Requirement Potential
Electricity generation potential
Low O & M Skills Potential
Low Medium
High
Very
High

31. Domestic WW Treatment
TECHNOLOGY SELECTION
Objective 4
Objective 1
Objective 3
Objective 2
Recycle
Reuse
Reduce
Capital
Cost
Reduce
Space
Reduce
Operation
Cost
UASB
ASP
MBBR
SBR
MBR
MBBR
UASB
SBR
SBR
MBR

32. Technology Options
Indian Scenario
Domestic
Wastewater
Technologies
Treatment &
Recycle / Reuse
(Desalination)
Treatment &
energy
production
Treatment &
Reuse
UP, Delhi
Maharashtra
Gujarat
AP, Karnataka
Chennai
Kerala

33. Way Forward
•Recycle/Reuse
•Techno-economicallyviabletechnologies
•ImprovementinO&M
•ReductioninOperationalCostbyInnovations
•StringentPolicies&ImplementationbyGovt.
•PromotionofPPPModels

34. Yesterday :WaterPollution
Water Stress
Today :WaterStress
Tomorrow :WaterScarcity
DayAfterTomorrow :WaterWar

35. Thank You !
Do not let the well dry,
to learn the worth of Water !
Vinita Dhupkar