Recycle Of Waste Water and Waste Management

Recycle Of Waste Water and Waste Management

Why waste recycling

• Prevents emissions of greenhouse gasses & water pollutants
• Minimization of pollution
• Volume reduction
• Sanitation of waste (composting)
• Stabilization of biodegradable compounds
• Supplies valuable raw materials to industry
• Stimulates development of greener technologies and Reduce the need for new land fills and incinerators.
• Value addition to the waste

  

Water Recycling

GOAL

• IMPROVEMENT OF HEALTH
• CAPTURING VALUABLE PRODUCTS (NITROGEN & PHOSPHORUS)
• EFFICIENT USE OF WATER

Category Of Wastewater Reuse

• Grey Water Reuse
• Reuse of effluent from wastewater treatment plants
• Reuse of Industrial Process Water

Reuse Of Industrial Process Water

BENEFITS

• Potential reduction in production costs from recovery of raw materials in the wastewater
• Less permitting and administrative burden from the reduction in wastewater toxicity and volume
• Heat recovery and reduced impacts from high temperature effluent to the ecosystem

APPLICATIONS OF TREATED WATER

• AGRICULTURAL IRRIGATION
• §URBAN/RESIDENTIAL RECYCLING
• GROUND WATER RECHARGE
• INDUSTRIAL ACTIVITIES
• AQUA-CULTURE
• POTABLE WATER

AGRICULTURAL IRRIGATION

Important factors to be considered-

• Salinity of water
• Water infiltration rate of soil
• Evapotranspiration rate
• Nutrients
• Soil property

URBAN/RESIDENTIAL RECYCLING

• Wastewater can be excellent for municipal landscape watering of gardens or grassed areas.
• It contains nutrients essential for plant growth and can be used in public areas – subject to simple precautions – as an alternative to discharge 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 for emergency fire fighting.

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

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 (RECLAIMED WATER) from secondary effluent of STP.

QUALITY OF RECLAIMED WATER

Key factors effecting on-site waste Management

Recycling

Energy Recovery