The Biological Treatment of Abattoir Wastewater in a Submerged Membrane Bioreactor
Paper ID : 1280-MST2015-FULL
Authors:
Tayebe Mousavipour1, Babak Bonakdarpour1, Elham Abdollahzadeh Sharghi *2
1Department of Chemical Engineering, Amirkabir University of Technology
2Department of Energy, Materials and Energy Research Center
Abstract:
Abattoir industries produce a large volume of wastewater during the slaughtering process. Abattoir wastewater (AW) contains high concentrations of biodegradable organic substances, nitrogen, phosphorus and sometimes some pathogens. Therefore, AW should be treated efficiency to avoid the environment pollution. The membrane bioreactor (MBR) is an alternative solution for AW treatment. In this study the organic pollutant removal performance and the mixed liquor characteristics of a MBR for the treatment of AW - at varying chemical oxygen demand (COD) - were considered. During the 83 days operation of the MBR at hydraulic retention time (HRT) and solid retention time (SRT) of 48 h and 80 days respectively, there was a consistently low turbidity (>2 NTU) in the MBR effluent. With increase in COD concentration of influent AW from 865±151 mg L-1 to 3200±672 mg L-1, inhibitory effect of increasing organic pollutant on the aerobic metabolic activity of activated sludge was not observed and COD, oil and grease (O&G) and NH3 removal efficiency increased from 88.4±2.3%, 51.2±6.4% and 39.2±0.8% to 96.4±1.1%, 78.9±8.1% and 72.4±7.3%, respectively. The COD value of effluent AW was decreased to 166±35 mg L-1 (COD discharge standard for AW is 200 mg L-1). NH3 concentrations of effluent AW was lower than 43.3±7 mg NH4 -N L-1. Also, the transmembrane pressure during the operation of the MBR remained in the range 1-2 kPa. The results of the present study indicate the very good potential of the MBR, both in terms of removal performance and membrane fouling, for treatment of AW.
Keywords:
Membrane bioreactor, Abattoir wastewater, Biological treatment, Nutrients removal, Organic substance removal, Membrane fouling.
Status : Paper Accepted (Poster Presentation)