Water Science and Engineering 2018, 11(3) 205-213 DOI:   https://doi.org/10.1016/j.wse.2018.10.002  ISSN: 1674-2370 CN: 32-1785/TV

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Keywords
Aeration tank
Clari-flocculator
Coefficient of reliability
Coefficient of variation
Common effluent treatment plant
Removal efficiency
Reliability analysis
Authors
PubMed

Common effluent treatment plant (CETP): Reliability analysis and performance evaluation

Ashwini V. Padalkar, Rakesh Kumar*

CSIR-National Environmental Engineering Research Institute (NEERI), Mumbai, Maharashtra 400018, India

Abstract

Common effluent treatment plants (CETPs) have been installed and are in operation at numerous industrial clusters throughout India. They serve to reduce effluent treatment cost, provide better collective treatment, and reduce land cost for small-scale industrial facilities that cannot afford individual treatment plants. Optimum working conditions for treatment of effluent to be at par with discharge standards is a major mandate for any CETP. In this study, the reliability and removal efficiencies (REs) of a CETP in the industrial area of Maharashtra State in India were examined. An established methodology was adopted to determine the effectiveness of the CETP in terms of biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids (TSS), and oil and grease (O&G) concentrations. The CETP’s compliance with respect to design standards and its operation were studied in detail. This paper highlights the results of RE and the coefficient of determination (R2) values obtained from the CETP data, estimates the pollutants removed at the highest and lowest rates over a period of time, and highlights the reasons for problem areas along with remedial measures. It was observed that, except O&G, all the parameters (BOD, COD, and TSS) showed fluctuations in removal efficiencies and their reliabilities. This situation can be improved by releasing effluent containing hydraulic and organic loading to the CETP as per standards and optimizing treatment processes, especially primary clari-flocculators and aeration tanks, both of which are important units of any CETP.

Keywords Aeration tank   Clari-flocculator   Coefficient of reliability   Coefficient of variation   Common effluent treatment plant   Removal efficiency   Reliability analysis  
Received 2017-08-07 Revised 2018-07-13 Online: 2018-07-30 
DOI: https://doi.org/10.1016/j.wse.2018.10.002
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Corresponding Authors: Rakesh Kumar
Email: rakeshkumarneeri@gmail.com
About author:

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