Impacts of Random Disposal of Industrial Wastes and Effluents on the Properties of Soils and Their Metal Contamination Near Different Industrial Plants in and Around Dhaka, Bangladesh

摘要

Soils in and around Dhaka and Gazipur are being contaminated with heavy metals and other environmental toxins by industrial wastes and effluents from different industrial plants. So, the present study has been undertaken to evaluate the amount and extent of pollution of the soils of the industrially polluted areas. The reaction of the soils at Keranigonj-3 near lead-storage battery industry and Demra-3 near IITube Mills Ltd., was found extremely acidic, whereas, near dyeing industries at Matuail-2 and Shampur-2, it was found alkaline. Organic carbon, total N and total P contents at Hazaribagh area near tannery industries were found higher as compared to other industrial sites. Na and K concentrations in soils at Hazaribagh tannery areas was found high, while Ca and Mg concentrations near textile dyeing industries and metal industries were found substantially high as well. Likewise, Zn, Cu, Ni and Pb concentration in the soils near electroplating, galvanizing, storage and dry cell batteries, metal processing products, steel and rerolling, tannery and textile dyeing industries were found high. An exceptionally high Pb concentration was found in the soils at Keranigonj-3 near lead-storage battery industry. A remarkably high concentration of Cd was found in the soils at Hotapara near dyeing and at Hazaribagh near tannery industries.