Jakkur lake and Rainbow drive stories
42
WATER FOR CITIES : PEOPLE SHOW THE WAY
-
Upload
biomeshubha -
Category
Environment
-
view
118 -
download
0
Transcript of Jakkur lake and Rainbow drive stories
WATER FOR CITIES : PEOPLE SHOW THE WAY
JAKKUR LAKE : WASTE WATER TREATMENT PLANT
The reuse of treated waste-water
• With a constructed wetland further polishing occurs• Wetlands become bio-diversity spots• Eco-system service functions of water
fulfilled• Groundwater recharge allowed• Fisheries possible
Jakkur – 18.9 sq km Catchment. 50 Ha water spread
STP’s need to be linked to reuse
Salient Features Design Capacity – 10
MLD
Present Average Inflow – 8.5 MLD
Wastewater generation – Yelahanka, Jakkur
Process Adopted – UASB followed by
Extended Aeration
Wastewater discharged in to – Wetland of Jakkur Lake
Design Parameters
The plant is designed for the following influent characteristics of wastewater.pH 7.06 – 8.1Total Solids 782-1352 mg/lTSS320-672 mg/lBOD5, 20°C 290-369 mg/lCOD465-973 mg/lChlorides (as Cl) 74-151 mg/lSulphates (as SO4) 11-41 mg/l
Design Parameters
The plant is designed for the following characteristics of treated water.BOD5 ≤ 20 mg/lSuspended solids ≤ 30 mg/lpH5.5 – 9Oil & Grease ≤ 10 mg/lResidual Chlorine ≤ 1 mg/lColour & Odour See NoteIron(as Fe) 3 mg/LNitrate Nitrogen 10 mg/LNote: all efforts are to be made to remove colour and odour as far as practicable
UASB Reactor
Treatment Plant and Jakkur Lake
Treated Wastewater entering the wet Land System of Jakkur Lake
Nature as further treatment
Lake ecosystem
Fisheries
RAINBOW DRIVE : HOW SHOULD WE MANAGE OUR WATER?
RAINBOW DRIVE
Location Sarjapur Road, Bangalore – Ground water stressed area
Size 34 acres, approx 350 plots, 258 occupied
Details Currently governed by Plot owners association (Society) since 2002.No BWSSB connectionDependent on Ground water ( owned bore wells)
Entrance:Prone to FlashFloods during
Rain
WATER SUPPLY - SOURCE
Borewells : Long story of many borewells .
BUT
No individual borewells only community borewells
WATER SOURCE AND SUPPLY - DISTRIBUTION
Source : Borewells
Two Centralised overhead tanks with
Piped connection to Each household.
Infrastructure Owned, Managed and Operated by
Plot owners association
WASTE WATER & SANITATION : What Was
Two STPs given by the builderSTPs functioning questionable
What to do with “treated” waste water?
Infrastructure Owned, Managed and Operated by
Plot owners association
SUMMARY OF KEY PROBLEMS in 2008
• Increasing water insecurity – borewells drying up.
• Community as a whole not aware of the problems – wasteful consumption
• Water Tankers not reliable.
• Flash flooding at entrance during heavy rains
• STP output water stagnating at entrance drains
Every household connection
METERED !!!!
Upto 2005 : Builder promised free water2005 : Consumption meters installed by
POA – separate water tariff (4Rs/KL)2008 : Water reform begins in Earnest
2007-2008 “Water reform”
0 5 10 15 20 25 30 40 60 800
10
20
30
40
50
60
70
2008 Tariff Change
20082005
Pric
e pe
r KL
Banning of private borewellsUnderstand consumption
Understand production costsCommunication & outreach
Invest in sustainability (Rainwater Harvesting)
Flooding a big problem. Recharge well projected as a solution for flooding
Community recharge wells dug for demonstration
Households invested in recharge at Household level get Rs 100/-
discount on bill!
RECHARGE WELLS – THREE TYPES
Wells in Storm water drains
invested in by RWA (Collective
Investment)
Wells in Storm water drains
invested in by House hold
(Just outside the house - individual
Investment)
Wells inside the House(individual
Investment)
This means good SWM
Understanding costs : Tariff revisions2005 - 2015
0 10 20 30 40 50 60 70 80 900
20
40
60
80
100
120
140
Change in tariff over a decade
2012200820142005
Water Slabs in KL
Pric
e pe
r KL
Understanding costs : Tariff revisions2005 - 2015
0 10 20 30 40 50 60 70 80 900
20
40
60
80
100
120
140
Change in tariff over a decade
2012200820142005
Water Slabs in KL
Pric
e pe
r KL
Tanker Costs : Rs 150/- to Rs 500 /- ( Rs 37.5 / KL to Rs 125 / KL)
0
1000
2000
3000
4000
5000
6000
7000
8000
0
50
100
150
200
250
300
350
Total Monthly water consump-tionPer capita consumption
2008 until now…..
0
1000
2000
3000
4000
5000
6000
7000
8000
0
50
100
150
200
250
300
350
Total Monthly water consump-tionPer capita consumption
Demand management – reducing demandPer capita drops from 250+ LPCD to approx 150 LPCDTotal demand drops despite increase in occupancy
Feb 08
Apr 0
8Jun
08Au
g 08
Oct 08
Dec 08
Feb 09
Mar 10
Mar 12
Dec-20
12
Feb-20
13
April-
2013
June-2
013
Aug-2
013
Oct-20
13
Dec-20
13
Feb-20
14
April-
2014
June-2
014
Aug-2
014
Oct-20
14
Dec-20
140
20406080
100120140160180200220240260280300320340360
Total no of occupied plotsPlots complying with RWH
Re-investment in Waste water reuse
EXCESS WASTE WATER SOLD TO A FARMER
Thank youBiome Environmental Trustwww.biome-solutions.comBiometrust.blogspot.in
[email protected] (9341324692)[email protected]@gmail.com
