URBAN AGRICULTURE ON STABILISED CITY WASTE

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Presentation transcript:

URBAN AGRICULTURE ON STABILISED CITY WASTE Mrs Almitra H Patel, Member Supreme Court Committee for Solid Waste Management almitrapatel@rediffmail.com 21 September 2006

OPEN DUMPS REMAIN UNIMPROVED The Municipal Solid Waste Rules 2000 required : Improvement of existing sites by 2001 Identification of new sites by 2002 Setting up of waste processing and disposal facilities by end 2003.

‘BIOLOGICAL PROCESSING FOR STABILISATION OF WASTES’ as per Rules This can be easily and immediately done as-is without waiting for compost plants : SANITISE waste to remove smell, flies, fire, starting with waste-collection points STABILISE waste by unloading it in aerobic windrows sprayed with bio-cultures

WINDROWED WASTE REDUCES IN VOLUME & IS FREE OF GERMS AND WEED SEEDS Wind-rows heat up to 55-70oC inside thru biological activity, ‘pasteurising’ the waste. Windrows need turning at least once after a week, + preferably weekly for 3-4 more times Waste is STABILISED in 45-60 days, producing no leachate.

STABILISED WASTE SUPPORTS PLANT GROWTH After decomposition is over, the waste is moist but free-flowing, dark-brown & earthy, rich in humus. Seed germination is the best test for maturity of the waste and completion of the decomposition process.

WHAT IS COMPOST ? After unwanted materials are sieved out of stabilised waste, the humus-rich fine fraction is saleable as compost. Sieving is necessary only because city waste contains mixed inerts and plastics etc along with the food wastes. Sieving is the most expensive part of compost production, raising compost costs to farmers which makes it difficult to sell.

WHAT IS VERMI-COMPOST ? Earthworms feed on DECOMPOSED waste, excreting microbe-rich vermi- castings good for soil. So feeding waste to earthworms is an alternative to sieving, not to aerobic windrowing or fermentation in heaps. Vermiculture needs less capital cost but more area and time than windrows.

PRODUCTIVE USE OF STABILISED WASTE The ultimate aim of composting is to turn waste back into foods or crops. These can be grown directly on stabilised waste spread in a layer 0.5-1 meter thick, preferably after sieving out the coarsest fraction through a 50 mm screen

IMPROVING OLD DUMPS WITH STABILISED WASTE In metros like Mumbai and Chennai where agricultural lands are far away, stabilised waste spread over old piles of untreated waste can support plant growth to reduce water percolation & leachate formation + improve aesthetics.

URBAN AGRICULTURE ON STABLILISED WASTE At Dhapa’s Square Mile in Kolkata, vegetables have been grown on stabilised waste for a century, to provide low-cost food for the city. Grow flowers or fodder, or peelable foods like maize, banana, pumpkin.

DUMPSITE REMEDIATION Stabilised waste spread over old dumps keeps down dust. Watering the crops controls fires. Perimeter plantings can control encroachments by shanties and provide alternate livelihoods to co-ops of rag-pickers who sometimes set fires to reclaim metals. Crops will stop this.

WE NOW HAVE POLICIES FOR PRODUCTIVE USE OF CITY COMPOSTS An Inter-Ministerial Task Force has advised balanced use of inputs to restore India’s soil fertility and food security, including co-marketing of synthetic fertilisers along with city compost within a radius of 50-100 km of compost plants for city waste.

CITY COMPOST + CHEMICAL FERTILISERS WORKS WONDERS FOR ALL CROPS: Reduce Chemical Fertiliser by 50%, buy compost with savings. Drought-proofing, less waterings, 15-25% higher yields in all crops tried (left). This is paddy 6 weeks after transplanting.

GREEN MANURING WITH ‘WET’ WASTE Amrita Institute Coimbatore has pioneered a promising solution for small towns : Portions of a trench between coconut trees are daily lined with dry leaves + bioculture, filled with canteen waste + bioculture + some canteen wastewater and covered with excavated soil. In-situ compost nourished nearby plants. Repeat after 6 months to build up humus and soil fertility.