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In this article, pollution of ecological systems with heavy metals and their hazardous effects were investigated as a view of waste management. Several industries from mining to electroplating produce large volumes of wastewater containing heavy metals. These wastewater cause accumulation of heavy metals through ecological circle in soil, plants and animals which directly enter human food chains presenting a high hazardous effect on consumers. They may cause severe damage of the kidney, reproductive system, liver,...

Low concentration of chlorinated aliphatic compounds may be found in wastewater and contaminated soils from different industrial sources and in the air arisen from these type sources. Low levels of Volatile Organic Compounds (VOC)’s could be removed by adsorption, incineration or biofiltration methods. These methods have some disadvantages with low removal efficiency or high operation cost. Chlorine has been removed from the chlorinated aliphatic compounds by biological methods at anaerobic conditions. The aim o...