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Licensed Unlicensed Requires Authentication Published by De Gruyter October 22, 2019

Effect of Temperature on Effluent Quality in a Biological Wastewater Treatment Process

E. Tejaswini, G. Uday Bhaskar Babu and A. Seshagiri Rao

Abstract

In the present study, the temperature effects on the organic carbon and nitrogen removal in an activated sludge process are evaluated. Benchmark Simulation Model No.1 (BSM1) based on activated sludge process is used for all the simulation purposes. A steady state simulation is performed to analyze the effluent concentrations with varying kinetic parameters obtained from different temperature coefficients over a wide range of temperatures from 15 °C to 35 °C. The temperature coefficient ‘a’ is assumed to have different set of values specific to the kinetic parameters, namely, Maximum heterotrophic growth rate μmH, Maximum autotrophic growth rate μmA, Heterotrophic decay rate bH, Autotrophic decay rate bA. The effluent concentration defined in terms of Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD), Total Suspended Solids (TSS), Total Nitrogen (TN) and Ammonia are observed to be significantly changing with a change in the kinetic parameters which are in turn a strong function of temperature coefficient. Emphasis is laid on the temperature range of 25–30 °C as it is commonly the most operated temperature range in a WWTP in India. It is also noticed that at temperatures <20 °C and >30 °C, the effluent limitations are violated from the standard values.

Acknowledgements

This work is funded by a Grant from Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India, under Extra Mural Research Funding with Grant No. EMR/2016/002750.

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Supplementary Material

The online version of this article offers supplementary material (https://doi.org/10.1515/cppm-2019-0018).


Received: 2019-02-13
Revised: 2019-09-19
Accepted: 2019-09-28
Published Online: 2019-10-22

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