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Optimisation of a modified submerged bed biofilm reactor for biological oleochemical wastewater treatment

Ismail, Zakaria and A. Aziz, Md. Maniruzzaman and Nik Mahmood, Nik Azmi and Ismail, Shahrul and Umor, Noor Azrimi and Syed Muhammad, Syed Anuar Faua'ad (2018) Optimisation of a modified submerged bed biofilm reactor for biological oleochemical wastewater treatment. Journal of Environmental Management, 226 . pp. 156-162. ISSN 0301-4797

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Official URL: http://dx.doi.org/10.1016/j.jenvman.2018.08.003

Abstract

Oleochemicals industry effluence mainly contains a high chemical oxygen demand (COD) in a range of 6000–20,000 ppm. An effective biological wastewater treatment process must be carried out before wastewater is discharged into the environment. In this study, a submerged bed biofilm reactor (SBBR) was adapted to the biological oleochemical wastewater treatment plant observed in the present study. The effect of wastewater flow rate (100–300 mL/min), Cosmoball® percentage in the SBBR system (25–75%), and percentage of activated sludge (0–50%) were investigated in terms of COD reduction. The Box-Behnken design was used for response surface methodology (RSM) and to create a set of 18 experimental runs, which was needed for optimising the biological oleochemical wastewater treatment. A quadratic polynomial model with estimated coefficients was developed to describe COD reduction patterns. The analysis of variance (ANOVA) shows that the wastewater flow rate was the most effective factor in reducing COD, followed by activated sludge percentage and Cosmoball® carrier percentage. Under the optimum conditions (i.e., a wastewater flow rate of 103.25 mL/min a Cosmoball® carrier percentage of 71.94%, and an activated sludge percentage of 40.50%) a COD reduction of 98% was achieved. Thus, under optimum conditions, as suggested by the BBD, SBBR systems can be used as a viable means of biological wastewater treatment in the oleochemicals industry.

Item Type:Article
Uncontrolled Keywords:Box-Behnken design, chemical oxygen demand (COD), oleochemical wastewater, response surface methodology (RSM), submerged bed biofilm reactor (SBBR)
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:85433
Deposited By: Yanti Mohd Shah
Deposited On:30 Jun 2020 16:39
Last Modified:30 Jun 2020 16:39

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