Challenges faced and Effective Solutions for Ensuring Water Quality by Delhi Jal Board

Presented By:Naresh Kumar Dargan

Ex. Engineer Delhi Jal Board

• TOTAL AREA : 1486 SQ KM

• POPULATION : 20 MILLION

• PROJECTED POPULATION 2021 : 23 MILLION

• ANNUAL MIGRATION FROM

• NEIGHBOURING STATES : 1.4 MILLION (APPROX)

• FLOATING POPULATION : 1.5 MILLION (APPROX)

• 5-6 MILLION PEOPLE LIVE IN UNPLANNED HABITATIONS

• COVERAGE WITH WATER SUPPLY NETWORK : 83 %

• SEWERAGE NETWORK COVERAGE : 50 %

• UNCOVERED : MAINLY UNAUTHORIZED COLONIES

DELHI’s DEMOGRAPHY: UNIQUENESS

Providing drinking water to every household

Enhance Service Standards for the consumers

Improve water quality

Reduction in Non – Revenue Water (NRW)

Energy Conservation

Better collection efficiency of revenue

Extension of water supply in un-served areas

FUNCTIONS & OBLIGATION OF DJB FOR WATER

WATER DEMAND & SUPPLY STATISTICS OF DELHI

Present Population of Delhi : 20 Million

Present Water Demand : 1140 MGD

Water Availability : 900 MGD(including 80 MGD ground water)

Water Treatment Plants : 09 Nos.

Water Lines network : 14500 Km

Rainey Wells : 16 Nos

Tubewells : 4500 Nos

UGR and Booster Pumping Stations : 117 Nos

QUALITIES OF POTABLE WATER

Safe / wholesome

water

Aesthetically acceptable

Radioactive elements absent

Free from Bacteria

Absence of organic

substances

Chemically safe

Parameters

Physical Inorganic

OR

Chemical

Toxic

Metals

Organic,

Nutrient

& Demand

Alpha emitter

Beta emitter

BiologyRadioactive

elementsBacteriological

Phytoplankton

Zooplankton

Total Coliform

Faecal Coliform

BOD

COD

Phenols

Oil &

Grease

Pesticides

Nitrate

Copper

Chromium

Cadmium

Zinc

Lead

Mercury

Iron

Manganese

PH

Conductivity

Total Dissolved

Solids

Temperature

Colour

Odour

Taste

Turbidity

Fluoride

Alkalinity

Nitrate

Phosphate

Hardness

Calcium

Magnesium

Chloride

Sulphate

Water Quality Assessment

S. No Zonal Lab Command Area

1. Wazirabad Central, North and New Delhi

2. Haiderpur North-West Delhi

3. Trans Yamuna Region East and North East District

4. Nangloi/ Haiderpur West- Delhi

5. Okhla South-Delhi District

6. G.K./ Nangloi/ Haiderpur South-West Delhi

7. Dwarka Part of West & South

8. Bawana North West

DETAILS OF DJB ZONAL LABORATORIES

Domestic Consumption

As per BIS Standards IS 10500-2012 with up to date amendments

S. NO. PARAMETERS UNITACCEPTABLE

LIMIT PERMISSABLE

LIMIT

1 pH - 6.5 – 8.5 NO Relaxation

2 Turbidity NTU 1 5

3 Colour Hazen 5 15

4 Odour - Agreeable Agreeable

5 Taste - Agreeable Agreeable

6 Total Dissolved Solids (TDS) Mg/L 500 2000

7 Total Alkalinity (as CaCo3 ) Mg/L 200 600

8 Total Hardness (as CaCo3 ) Mg/L 200 600

9 Chlorine (as Cl) Mg/L 250 1000

10 Sulphate (as So4) Mg/L 200 400

Water Quality standards in india

• RIVER YAMUNA AND CANAL ORIGNATING FROM RIVER GANGA ARE THE MAIN

SOURCES OF RAW WATER FOR DELHI

• MIXING OF DRAINS AND INDUSTRIAL WASTE IN RAW WATER SOURCES.

• SOMETIMES EXCESS AMMONIA IN RAW WATER OF RIVER YAMUNA BECOMES A

CONCERN

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SOURCES OF CONTAMINATION IN RAW WATER

Quality monitoring at Water treatment plant

Raw water/Canal Water

Screening

Pre Chlorination

Coagulation Flocculation

Sedimentation

Decantation

Filtration Post Chlorination

Storage and Pumping

Consumers

LEAKAGES IN THE WATR SUPPLY NETWORK

ILLEGAL WATER CONNECTIONS FROM DJB WATER LINES

MIXING OF DRAIN WATER WITH DRINKING WATER DUE TO

DAMAGED HOUSEHOLD WATER CONNECTION

POOR MAINTENANCE OF HOUSE SERVICE CONNECTIONS

OF THE CONSUMERS

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CAUSES OF CONTAMINATION IN NETWORK

LEAKAGE THROUGH HSC NORMAL PRACTICE OF REPAIR

POOR QUALITY OF SADDLEGI PIPE BELOW GL

CORRODED EXISTING GI WATER CONNECTIONS

PROTECTION OF WATER SOURCES FROM CONTAMINATION.

PROPER MAINTENANCE OF TRANSMISSION AND DISTRIBUTION NETWORK

MONITORING OF QUALITY AT EVERY STEP OF TREATMENT IN WTP

REPLACEMENT OF OLD OVERAGE AND DAMAGED WATER MAINS

URGENT REPAIRS OF WATER LINE LEAKAGES

REGULAR SAMPLING OF WATER IN THE DISTRIBUTION NETWORK

EDUCATING THE CONSUMERS TO MAINTAIN THE HOUSE SERVICE CONNECTION

PROPERLY

GENERAL STEPS TO KEEP THE WATER QUALITY SAFE

DJB HAS IMPLEMENTED THREE PILOT PROJECTS ON PPP MODEL WITH

PRIVATE OPERATORS FOR WATER DISTRIBUTION IN THE COMMAND

AREAS OF MALVIYA NAGAR UGR, NANGLOI WTP AND MEHRAULI-

VASANT VIHAR GROUP OF COLONIES.

IN PPP PROJECTS, KPIS (KEY PERFORMANCE INDICATORS) RELATED TO

IMPROVEMENT IN SERVICES HAVE TO BE ACHIEVED IN FIXED TIME

LINES

THESE PROJECTS ARE OF 10 TO 15 YEARS O&M DURATION

METERING OF EVERY HOUSEHOLD CONNECTION

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INITIATIVES TAKEN BY DJB FOR ENHANCING SERVICE STANDARDS AND QUALITY MANAGEMENT

PROJECT AREA : 129 SQM (8.6% OF ENTIRE DELHI)

POPULATION : 15 LACS ( 8% OF ENTIRE DELHI)

TOTAL COST OF PROJECT : RS 4585.40 MILLION

CONCESSION AGREEMENT

WITH THE OPERATOR : 15 YEARS

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HIGHLIGHTS OF NANGLOI PPP PROJECT

DJB Share

70 %

Rs. 3209.80 Million

Operator’s Share

30 %

Rs 1375.60 million

Total Estimated Project Cost

Rs. 4585.40 Million

PROJECT STRUCTURE

• MAINTENANCE OF EXISTING WATER SUPPLY NETWORK

• REPLACEMENT OF OLD AND DEFECTIVE WATER LINES WITH HDPE/DI PIPELINES

• REPLACEMENT OF ALL EXISTING HOUSEHOLD SERVICE CONNECTION (HSC) WITH

MDPE PIPES WITH 15 YRS FREE MAINTENACE WITHOUT ANY COST TO CONSUMER

• INSTALLTION OF WATER METERS ON EVERY HSC BY CHARGING RS 400/-

• LAYING OF WATER LINES IN NO NETWORK COLONIES WITH HSC INSTALLATION

• REGULAR SAMPLING OF WATER IN THE PROJECT AREA

• TIME BOUND REPAIR OF LEAKAGES AND COMPLAINT REDRESSALS

• MEET OUT KEY PERFORMANCE INDICATORS AFTER CONSTRUCTION PERIOD

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MAIN OBLIGATIONS OF THE PPP OPERATOR

ILLEGAL AND UNAUTHORIZED WATER CONNECTIONS FROM DJB

WATER LINES IN NETWORK AND NO NETWORK COLONIES

HIGH NON REVENUE WATER ( 79 % IN 2013)

RELUCTANCE OF RESIDENTS TO TAKE LEGAL CONNECTION

RELUCTANCE OF CONSUMERS FOR INSTALLATION OF WATER METERS

ACCEPTANCE OF A PRIVATE OPERATOR AS A WATER SERVICE PROVIDER

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CHALLENGES FACED IN NANGLOI PPP AREA

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CHALLENGES FACED IN NANGLOI PPP AREA

EXTENDED UNAUTHORIZED WATER CONNECTIONS

LEAKAGE THROUGH HSC NORMAL PRACTICE OF REPAIR

RUST INSIDE THE CI PIPE CONTAMINATION OF WATER

GI PIPE USED FOR

HSC

DEFUNCT WATER METER

PREVIOUS SCENERIO

PE pipes - Use of Medium Density Polyethylene pipe for HSC and HDPEpipes for distribution Network

Quality Total System Cost Service Life Reliability

PE Pipe Cont……

TECHNICAL INNOVATION IN PPP PROJECT

TECHNICAL INNOVATION IN PPP PROJECT

ELECTRO-FUSION SADDLE

APPROPRIATE SADDLES TO PROVIDEHOUSE SERVICE CONNECTION ON PE PIPE LINE, STANDARD EN 12201-3 / ISO 4427 .

TECHNICAL INNOVATION IN PPP PROJECT

• Good quality of materials (Body – Ductile Iron,Strap – Stainless Steel with Epoxy coating, nutbolt- Brass) which guarantees a life time equalto those of the pipes and are also anticorrosive.

• Reduced risk of leakage – No metal to metalcontact due to insertion EPDM bush.

• Perfect stability on pipe, whereas ferrulesprone to bend and leak, where pipe laid atshallow depth due to surplus /traffic load.

TECHNICAL INNOVATION IN PPP PROJECT

• 15 % REDUCTION IN NRW

• 91% INCREASE IN CONSUMERS

• REDUCTION IN WATER CONTAMINATION COMPLAINTS

• CUSTOMER SATISFACTION

• 80 % CONSUMERS HAVE WATER METERS

• REDUCTION IN LOSSES AT WATER TREATMENT PLANT

• 24 HR TOLL FREE COMPLAINT NO

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ACHIEVEMENTS IN NANGOI PPP PROJECT

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THANK YOU