Title: Evaluation of polishing of the effluent from UASB reactor by diffusers

Authors: Rinku Walia; Pradeep Kumar; Indu Mehrotra

Addresses: Department of Biotechnology and Environmental Engineering, Thapar University, Patiala, Punjab 147004, India. ' Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India. ' Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India

Abstract: Effluents from bench scale 56 L upflow anaerobic sludge blanket (UASB) reactor and four UASB based sewage treatment plants (STPs) of capacities ranging from 27 ML/d to 70 ML/d were aerated in batch as well as in continuous mode of operation. The process was monitored by measuring temporal trend in Oxidation Reduction Potential (ORP), dissolved oxygen (DO), chemical oxygen demand (COD) and biochemical oxygen demand (BOD). With the increase in ORP from ?150 mV to +200 mV, COD of the effluent decreased by ~50% with a decay rate of 0.36 per hour. A multiple regression equation has been established to correlate ORP, COD and DO.

Keywords: aeration; anaerobic treatment; COD; chemical oxygen demand; wastewater treatment; effluent treatment; regression modelling; oxygen transfer; diffusers; UASB reactors; upflow anaerobic sludge blanket; sewage treatment.

DOI: 10.1504/IJEWM.2012.044166

International Journal of Environment and Waste Management, 2012 Vol.9 No.1/2, pp.154 - 168

Published online: 13 Dec 2014 *

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