Luying 0127
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http://kitakyushu.iges.or.jp/docs/sp/swm/2%20Solid%20Waste%20Management%20in%20Dhaka.pdf
Daily production of solid waste in Dhaka City is more than 4000 Metric Tons. Of those 200 Metric Tons of hospital and clinical waste is a mixture of toxic chemicals, radioactive elements and pathological substances.
15 to 20 percent of medical wastes are highly dangerous for human lives. These waste when dumped with other municipal wastes in the open land poses threat to serious health hazard to the city people.
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An Inception Report on Control & Management of Polyethylene bags in Bangladesh shows that people of Dhaka City alone used 600 million bags a day.
During floods, floodwater did not drain quickly, as one of the major reasons was due to polyethylene in the draining system. Polyethylene and plastic materials are not biodegradable.
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KieranTimberlake Design + Research Laboratory01/27/2012
PRINCIPAL SOURCES OF SOLID WASTES
residencecommercial establishmentinstitutionsindustrial and agricultural activities
Source: Urban Indicators Program Phase I: 1994 – 1996(http://www.hsd.ait.ac.th/ihsa/si/a13lc/dhaka/ui.html)
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COMPOSITION OF SOLID WASTE IN RESIDENTIAL AND INDUSTRIAL AREAS
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KieranTimberlake Design + Research Laboratory01/27/2012
DISPOSAL METHODS
OPEN DUMPING---practiced extensively inBangladesh
SANITARY LAND FILLING
INCINERATION---If incineration is to become an economi-cal method for solid waste disposal, useful materials and energy must be recovered by the process
COMPOSTING OF REFUSE---many types of microrganisms already present in the waste biostabilize the organic matter in the waste and produce a soil conditioner.
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Incineration for electricity power?
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Composting for a cleaner atmosphere and richer soil?
Waste Concern has developed a good network with the nurseries and fertilizer marketing companiesto sell their compost at a price of TK 2.5 to TK 5.0 per kg. The quality of compost is monitored in thelaboratories of Soil Sciences Department of Dhaka University. Table 5 shows the nutrient value of thecompost produced by this plan in comparison with the other compost.
Waste Concern is trying to reduce the decomposition time of 40 days by using inoculums (compost digester) to accelerate the decomposition.
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“system dynamics”
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Simulated uncleared waste, untreated waste , number of trucks and composite index with increase in collection capacity for a time horizon of 30 years
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FIXED COST, OPERATIONAL COST AND EARNING FROM THE COMPOST
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