Recycle of Waste Water

8/2/2019 Recycle of Waste Water

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A

PRESENTATION

ON

RECYCLE OFWASTE WATER


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GOAL-

IMPROVEMENT OF HEALTH CAPTURING VALUABLE PRODUCTS (NITROGEN &

PHOSPHORUS)

EFFICIENT USE OF WATER

WATER RECYCLING

USE

PURIFICATIONRECLAIMATION


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SUGGESTED WATER RECYCLING TREATMENT AND

USES


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NEED FOR WASTEWATER REUSE

Use/Recycle (water and recycled water)

Development of new water sources

Reduce consumption Prevention of water resource degradation

Improvement in efficiency of water

consumption


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CATEGORY OF WASTEWATER REUSE

Gray Water Reuse

Reuse of effluent from wastewater

treatment plants

Reuse of Industrial Process Water


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SOURCES OF GREY WATER


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Outline of Grey Water Reuse

OUTLINE OF GREYWATER REUSE


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OUTLINE OF

SECONDARYEFFLUENT

REUSE


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REUSE OF INDUSTRIAL PROCESS

WATER

BENEFITS-

Potential reduction in production costs from recoveryof raw materials in the wastewater

Less permitting and administrative burden from the

reduction in wastewater toxicity and volume

Heat recovery and reduced impacts from hightemperature effluent to the ecosystem


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APPLICATIONS OF TREATED WATER

AGRICULTURAL IRRIGATION

URBAN/RESIDENTIAL RECYCLING

GROUND WATER RECHARGE

INDUSTRIAL ACTIVITIES

AQUA-CULTURE

POTABLE WATER


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AGRICULTURAL IRRIGATION

Important factors to be considered-

Salinity of water

Water infiltration rate of soil Evapotranspiration rate

Nutrients

Soil property


12/28Rice farming with treated wastewater


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URBAN/RESIDENTIAL RECYCLING

Wastewater can be excellent for municipallandscape watering of gardens or grassed areas.

It contains nutrients essential for plant growthand can be used in public areas - subject to

simple precautions - as an alternative todischarge into nutrient-sensitive waterways.

Other uses may be for watering of golf courses,racecourses, aerodromes or for dust

suppression on roads and sewer flushing. It could also provide added capacity foremergency fire fighting.


14/28SCHEME OF URBAN AREA RECYCLING SYSTEM


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INDUSTRIAL ACTIVITIES

Uses of water in Industries-

Processing

Washing

Cooling of facilities (Cooling Tower)


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COOLING

TOWER


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WASHING IN MANUFACTURING INDUSTRIES

WASHING RINSE

OIL

SEPARATION

OIL

UF

RO

IE

AC

TREATED

WATER

DETERGENT


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GROUND WATER RECHARGE

Uses -

Reduce,stop or reverse the declining ground

water level,

Protect underground freshwater in coastal

aquifers against salt water intrusion from sea,

Store surface water including flood or other

surplus water for future use


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IMPORTANT PARAMETERS OF GW RECHARGING

PARAMETERS SURFACE SPREADING DIRECT INJECTION

DEPTH TOGROUNDWATER

Vadose Zone(unsaturated GW zone)

3-15 m

Not Applicable

RETENTIONTIME IN

GROUND

6-12 Months dependingon pretreatment

12 Months

MAX. %RECLAIMEDWW

20-50% On AnnualBasis at Extraction

Well

20% On Annual Basisat Extraction Well

MONITORING Extensive Quite extensive


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Benefits of Ground Water Recharge-

Cost effective storage

Eventual distribution system

Elimination of evaporation loss Protection from pollution

Prevention of potential taste & odor


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AQUA-CULTURE

Primary treated WW +

High concentration

Nutrients for organisms

Fish-

food

organisms

Fishes

Carp culture should not be done in main stabilisation pond, due to

presence of high BOD. In such cases air-breathing fishes should be

grown there.

Benefits- As the BOD in the waste water is decreased due to aqua culture

it can be discharged into natural water. To utilise the nutrients enriched water resources for producing

animal protein


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POTABLE WATER

Generally raw sewage contains-BOD- 300 mg/l

COD- 500 mg/l

Organic matter

Heavy metal

Toxic compounds

Pathogenic bacteria etc.

Treatment of sewage to potable water means removal of harmful

components and decrease of BOD to less than 2 mg/l.

Singapore has developed such a treatment process to revive

potable water (NEWater) from secondary effluent of STP.


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Multiple barrier approach for microbial and chemical

contaminant removal from secondary effluent

REMOVAL

TSS

TURBIDITY

BACTERIA

VIRUS

REMOVAL

COLOR

HARDENESS

SULPHATES

NITRATES

SODIUM

AROMATIC

HYDRO-

CARBON

ENSURE

INACTIVATION

OF ALLORGANISMS


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NEWATER FACTORY TREATMENT PROCESS


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NEWater exceeds the drinking water standards

set by the World Health Organisation and the

United States Environmental Protection

Agency.

The quality and safety of NEWater had also

been endorsed by an international panel of

experts which conducted some 30,000comprehensive tests and analyses.

QUALITY OF NEWATER


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IMPORTANT CONSIDERATIONS

Recycled water systems must be well managed

Waste water must be treated to a sufficient standard toensure there are no health and pollution risks

It should be cost effective


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Documents

Recycle of Waste Water