Abstract
Common effluent treatment plants (CETPs) have been considered as one of the best cooperative solutions for industrial clusters in India. The concept of CETPs has been propagated to assist small industries who lack financial and technical capability to treat their individual units’ effluent. The operational aspects of CETPs are critical for their optimum functioning. This article presents a comparative study on reliability of ten CETPs operating in Maharashtra state of India, along with their removal efficiencies (RE). An established methodology has been used to determine the coefficient of reliability (COR) for biochemical oxygen demand, chemical oxygen demand, total suspended solids and oil and grease for the effluent from these CETPs. The design concentrations required for meeting the specified standards as prescribed by Maharashtra Pollution Control Board along with the expected percentages of compliance have been calculated from the obtained COR values. A novel method of comparing the relationship of RE with its reliability for each CETP has been established in the form of regression equations. The obtained coefficient of determination values (R2) has been further used to assess the working of treatment units and identify problem areas. Results indicate that R2 values > 75% are observed for the treatment units functioning optimally as per design. The values are also dependent on the types of member industries to the CETP and the status of the effluent variability. A novel method of estimating the functioning of effluent treatment units has been thus examined.
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