Assessment of water quality of Chatta canal affected by textile bleaching , dyeing and printing effluents in Maheshtala Region,South 24 parganas, West Bengal, India

Chatta Canal & Churial Canal is under the of severe pollution due to the discharge of huge quantity of effluent from more than 800 tiny and small scale (SSI) textile bleaching, dyeing and printing units located at Maheshtala (22.29 0 N, 88.110 E). In past, the canal was a source of fishing and feeding water to the adjoining land for irrigation. The canal now carries exclusively industrial effluents and sewage except in rainy season and hence under severe threat for agri-irrigation . Seven surface water samples in 2 years (2012-13) from various locations of Chatta canal in summer, rainy and winter season have been collected for assessment its quality with standard analytical methods. The study revealed that the chemical parameters like COD(552mg/l) , suspended solids( 540mg/l), total dissolve solids (3398 mg/l), biological oxygen demand (172 mg/l),carbonate (711mg/l) , Cr (0.10mg/l) and lead Pb (0.027 mg/l) have exceeded the maximum permissible discharge limits laid down by Bureau of Indian Standards(BIS) and WHO ( 2003) standards. Hence, a comprehensive study on eco-planning is required to reduce the contamination of agricultural land as well as crops, fruits and vegetable required for human consumption.