Abstract
An investigation was conducted to assess the impact of solid waste disposal on surrounding environment of Matuail landfill site of Dhaka city. Three different locations such as current dumping, abandoned and its surrounded agricultural areas of Matuail landfill were selected for soil and plant samples, leachate from active dumping and fish samples from treated leachate pond. The Cu, Zn and Pb concentrations were high in the dumping (360 µg g-1 Cu, 806 µg g-1 Zn and 382 µg g-1 Pb) and abandoned (199 µg g-1 Cu, 452 µg g-1 Zn and 519 µg g-1 Pb) areas that exceeded the permissible limits. The heavy metal concentrations in plant samples did not show any significant contamination except Cu, Zn and Pb that also exceeded the permissible limits. On the other side, the organic matter and nutrient concentrations such as N, P, K and S of both soil and plant samples are within desirable value in the studied area. The concentrations of DO, BOD, COD and TDS of the untreated leachate were found 1.34 mg L-1, 96 mg L-1, 1343 mg L-1 and 7120 mg L-1, respectively that exceeded inland surface water standard but after treatment the concentrations of DO, BOD and TDS in the treated leachate pond were found within the permissible limit. The presence of heavy metal in leachate is not contaminated as it is below the toxic limit. The bioaccumulation of fish from treated pond is extremely high of Fe, Mn, Pb and Ni that exceeded the WHOs permissible limit.
Highlights
Rapid growth of industries, lack of financial resources, inadequate trained manpower, inappropriate technology and lack of awareness of the community are the major constraints of solid waste management for the fast-growing metropolis of Dhaka (Zahur, 2007; Jahan et al, 2016)
The results show that the soil of dumping and abandoned landfill area contained significant amount of heavy metals and their concentrations are in the order of Zn >Pb> Cu > Ni > Cd, where Pb, Cu and Zn exceeded the permissible limit
Except Cu, Pb and Zn, the heavy metal concentrations of plant in entire areas of the landfill sites are below the level of toxicity
Summary
Lack of financial resources, inadequate trained manpower, inappropriate technology and lack of awareness of the community are the major constraints of solid waste management for the fast-growing metropolis of Dhaka (Zahur, 2007; Jahan et al, 2016). This waste comprises of 46.8% domestic, 21.8% street sweeping, 19.2% commercial, 12.9% industrial and 0.5% clinical wastes (Salam, 2001). Solid waste contains significant quantity of degradable organic matter which may rich the nutrient status of soil To illustrate, if they are properly managed by segregating the waste according to their source it can be used on agriculture after composting (Singh and Mahour, 2012).
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