CENTER OF EXCELLENCE IN URBAN DEVELOPMENT (DECENTRALIZED WASTEWATER MANAGEMENT & PUBLIC PRIVATE PARTNERSHIPS). Department of Civil Engineering IIT Madras, Chennai. DECENTRALIZED WASTEWATER MANAGEMENT. CURRENT STATUS IN INDIA.
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(DECENTRALIZED WASTEWATER MANAGEMENT &
PUBLIC PRIVATE PARTNERSHIPS)
Department of Civil Engineering
IIT Madras, Chennai
The wastewater generation increased from 7,000 mld in 1978-79 to 17,000 mld in 1994-95 in Class I cities.
39% of wastewater was treated in the year 1978-79.
But, in the year 2003, only 26% of wastewater generated in cities was treated
27 cities have only primary treatment facilities
indirectly into the rivers/ lakes/ ponds/ creeks in 118 cities;
on to the agriculture land in 63cities
directly into rivers in 41 cities.
in 44 cities, it is discharged both into rivers and on agriculture land.
In many of the coastal cities, the wastewater finds its way into estuaries, creeks, bays etc. (Around 25% of total wastewater)
Organic matter, TSS, N, P, pathogens
Biomass + breakdown products
Aerobic (with oxygen)
Anaerobic (without oxygen)
Phosphorous adsorption:clay-humus complex
Phosphorous precipitation:iron, aluminum, calcium
Problems:saturation and clogging
The role of the plants:
Primary treatment :
Septic tank :lower the total organic loading, and separate the solids from the liquid
Constructed wetland:convert the dissolved or suspended material into a useful form separated from the water
Floating Macrophytes systemConstructed wetlands: Different types
The aerobic conversion of the organic matter occurs in three steps:
(new cells )
External substrate is completely removed.
Auto oxidation (internal substrate is used)
Net growth = 0
T.F Reactor in which randomly packed solids forms provide surface for microbial growth.
- system for wastewater distribution
Specific surface area and porosity
Specific surface area: The amount of surface area of the media that is available for bio film growth
BP TankSubmerged MBR System
1. Promote Anaerobic treatment technologies for energy generation
2. Develop Wastewater reuse and recycle systems after adequate treatment
Thankyou adequate treatment