conventional systems of sanitation for safeguarding water
TRANSCRIPT
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Conventional Systems of Sanitation for
Safeguarding Water Quality through
Decentralised Phytorid System
Dr.Rakesh Kumar
Director Gr. Scientist and Head
National Environmental Engineering Research
Institute,
NEERI- Mumbai
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NEERI: Mandate First Institute set up in 1958 for public health
Engineering
It was renamed in 1974 by PM as NEERI and To conduct R&D in environmental science and engineering
To participate in CSIR thrust areas and mission projects to develop ESTs
To render assistance to industries & Government bodies to mitigate environmental pollution with sustainable technology
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Why we are here???
Waste water generation and water quality maintenance a big issue
Rivers and lakes suffer the most
Set an example which will mark it as a biggest difference for
SUSTAINABILITY
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Sanitation…
Traditional interpretation:
Personal and household hygiene
Clean environment including water
Solid waste management
Greywater disposal and treatment
Safe excreta disposal
Stormwater handling
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Sanitation …
• Modern interpretation
• Acceptance,
• affordable,
• convenience and pride
• Environmentally sustainable (comprises variety of
prospective)
• Ecology
• Economy
• Resource
• Social
• reuse
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Linear flow in conventional
sanitation system
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Approach of treatment should be like
circular flow
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Conventional Systems and Why
We lost track ???
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Septic Tank
Usually removes about 40% of the incoming BOD and about 80% of the incoming SS
Anaerobic process results in a relatively infrequent need for desludging
Design should consider a sludge allowance of 0.05 m3/ person year for sizing of the units
Used for the treatment of wastewater from individual
households
Employs anaerobic digestion to reduce the volume of
solids settled out of the wastewater
1st
Compartment 2nd
Compartment
Inlet
Tee
Outlet
Tee
Tank Covers
Liquid Level Scum Layer
Inlet
from
House
Outlet
To
Drain field
Sludge
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What has been changed by NEERI
A septic tank with addition of high digestion
Longer Cleaning Frequency
High Efficiency for Solids Removal ( up to 70%)
Much Higher BOD Removal ( up to 60%)
Low Footprint (less space)
Amenable to further treatment and reuse
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Biological Treatment..
Aerobic biological oxidation systems can be classified into
different types: all need continuous energy input
Influent
Effluent
a) Plug Flow
Influent
Effluent
b) Mixed Flow
Influent
Effluent
c) Completely Mixed Flow
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Biogas Units
Usually designed on the basis of about 2.5 kg VS/m3 and a retention time of about 20 days
Typical units are 1-5 m3 in capacity
Gas to
Combustion
or other uses
Dung Water
Feed
Slurry
Gas- Holder
(CH4+ CO2 +…)
Sludge
Digester
Rural biogas units receive both domestic and animal wastes from a household
Provide a valuable source of cooking gas as well as a fertilizer -rich residue
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Maintains high concentration of biomass through formation of highly settleable microbial aggregates
Wastewater flows upwards through a layer of sludge
At the top of the reactor, phase separation between gas-solid-liquid takes place
Any biomass leaving the reaction zone is directly recirculated from the settling zone
Suitable for both soluble waste and those containing particulate matter
Effluent
Gas bubbles
Baffles
Weir 3 Phase Separator
Sludge granules
Sludge Bed Influent
Upflow Anaerobic Sludge Blanket:
Many units installed under YAP
Biogas
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Direction of Waste Treatment …..
Its no more a situation of treating to meet certain standard and discharge in nearby water bodies
Pressure from public and authorities to show more commitment
Water cost rising
Disposal not easy
Long term liability
Waste water disposal making water non-potable
Water availability is the Key Issue
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What is more attractive!!
Energy free or low cost treatment: Sustainability : not best technology
Methods which can make things easier
WETLAND PLANTS BASED TREATMENT
COMBINATION OF CONVENTIONAL TREATMENT WITH NEW ONES
A study conducted by NEERI, 2001 showed that almost 85 percent of the activated sludge
treatment plants were non-functional
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Wetland system can be used to improve the quality of wastewater
originating from
Domestic wastewater
Agricultural wastewater
Slaughter House Waste
Fish pond discharges
Pre treated industrial wastewater
Municipal Landfill leachates
USE OF WETLAND TECHNOLOGY: PHYTORID
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NEERI developed a Sub-surface
wetland technology: PhytoRid
It needs less space : Equivalent to ASP
Does not cause odour
Does not provide surface for mosquitoes breeding
No power/electricity: Gravity flow
1/5th of O&M cost compared to other technology
National (2007) and International Patents (Australian and European Patent), 2005
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Inaugurated by Shri Suresh Shetty
(Honbl’e State Minister) Medical Education Higher & Technical Education
On
World Environment Day 5th June, 2006
at
Kalina Campus Mumbai University
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FEATURES OF THE SYSTEM
Secondary Advanced Cell with Filter Media in 3
Layers
Tertiary Biological Cell with Filter Media &
Wetland Plants
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University Wetland System
COD 96 %
BOD 75 %
TSS 74 %
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University Wetland System
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Panvel Wetland System
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LAYOUT DESIGNS
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SIEMENS
It forms part of their garden area
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MAHINDRA & MAHINDRA, iGATPURI
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In Office and Residential Complex:
Grey Water
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KOLIMB AGRICULTURAL COLLEGE (TITWALA-THANE DIST.)
Design for treat the grey wastewater generated Design to treat the flow of 5 CMD Operation starts from June 2009 Treatment system has septic chamber and Phytorid system Treated water is reuse for gardens, vermin-compost plant
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TREATED WATER QUALITY
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Sr. Items Conventional activated
sludge
UASB Extended Aeration
Facultative Aerated Lagoons
PhytoRid Technology
1 Performance BOD Removal %
85-92 75-78 95-98 75-85 80-95
2. Sludge First digest then dry on beds or use
mech devices
Directly dry on beds or use mech
devices
No digestion dry on sand beds or use
mech devices
Mech. Desludging once in 5-10 years
Negligible
3. Equipment Requirement (excluding screening and grit removal common to all processes)
Aerators, recycle pumps,
scrappers, thickeners, digesters, dryers gas equipment
Nil except gas collection and
flaring gas conversion to
elect is optional
Aerations, recycle pumps
sludge, scrappers for large settlers
Aerators only
None, all flows by gravity
4. Operational Characteristics
Skilled operation
reqd.
Simpler than ASP Simpler than ASP
Simple Unskilled operator
5. Special features Considerable equipment and
skilled operation reqd specially when gas collection
and usage considered
Minimal to negligible power reqd. makes it economical at
even if gas revenue is neglected
BOD removal highest effluent
nitrified high power reqd. Favoured for
small and medium plants
Power reqd. similar to
ASP operation simpler
Plant species and odour
less operations
Typical Performance Characteristics for Various Treatment Methods
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Operational and being implemented
PhytoRid System Raj Bhawan, Mumbai CIDCO at Panvel Kalina, Mumbai Premier Industry Campus Murbad School Chakan Industry Kalyan, Household NEERI, Mumbai Slaughter House, Aurangabad, Nashik, Nagpur, Chandrapur Matheran Town Feasibility Ammunition Factory, Khadki Dairy Industry 64 villages in CIDCO area: as Corporate Social Responsibility Project Housing complexes in Thane, Pune, Bangalore
Delhi Nallas, Kushak and Chirag NOIDA Industrial Area Nalla Rejuvenation Municipal Corporation of Delhi (Chirag Nalla water) New Raipur Development Jabalpur, Durg and Bhilai Waste water source cleaning Lonar, Goa, Yawatmal and others
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Some Work of NEERI’s
Technology for Lakes and Nalla
Waste Water Treatment
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Telibandha Lake,
Raipur
Lake Area: 11 Ha Phytorid Capacity 2 MLD Proposed to develop 3 plant at periphery
Second Phase started
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Lonar Lake (under
threat), Maharashtra
Nabi Lake
Lonar Lake
Phytorid Plant on Nabi Lake
Under Consideration
Lake Area: 3 Ha
Phytorid Capacity 500 KLD
Plant Construction completed under
commissioning
Will Treat entire Sewage from Lonar
City
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Kot Lake Brahmapuri, Maharashtra
Phytorid Capacity 450KLD
Project Approved
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T. Nasripura,
Mysure
Outfall 1
Outfall 2
Outfall 3
River Kambini
River Kaveri
Narsimha Swami
Temple
Site at Outfall 2 for
PHYTORID 0.12 MLD
Site at Outfall 3 for
PHYTORID 0.28MLD
Under design
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Proposed Site for Phytorid for River Pollution Reduction
View of Nag Nadi-Naala from
University library road
View of Nag Nadi-
Naala
towards Panchsheel
Nag Nadi- Naala
Width: 6.4 meters
Depth: 11 inches (0.2794 meters)
Length: 500 meters(between university road and panchsheel)
Estimate flow : 4 MLD
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Proposed design of Phytorid
Estimated land area required: 2563 m2 For a plant capacity of 1000 m3/day
Entire length of the plant: 267m For a plant capacity of 1000 m3/day
Length of the Phytorid bed: 184 m Dimension: 1.5m depth X 184m length X 8m width
Project completion period: 12 months
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Design Feature for PRAJ Project
3-D View of Individual Wetland Bridge
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Design for a typical lake
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Proposed Design for the Nallah
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Conclusions Wastewater management issues are integral to the
water supply, sanitation and health of the population.
WW Management is no more a concept which needs to work with only Governmental Grants
It must have payback possibility to the society
Urban poor sanitation is a separate issue, however, it is linked with the overall sanitation plan of the city.
It leads to overall improvement in the City Sanitation leading to better HEALTH AND
ENVIRONMENT