Gas-lift anaerobic dynamic membrane bioreactors for high strength synthetic wastewater treatment

Effect of biogas sparging velocity and HRT on treatment performance

Journal article (2016)

Authors

M.E. Ersahin Sanitary Engineering - , Istanbul Technical University

J.B. Gimenez Garcia Universitat de València, Sanitary Engineering -

H. Ozgun Istanbul Technical University, Sanitary Engineering -

Y. Tao Sanitary Engineering - , Harbin Institute of Technology

H. Spanjers Sanitary Engineering -

J.B. van Lier Sanitary Engineering -

Research Group

Sanitary Engineering () (TU Delft)

Anaerobic membrane bioreactor Feasibility Wastewater treatment Dynamic membrane Gas sparging velocity

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Published Date

01-12-2016

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Water Management

Research Group

Sanitary Engineering

Abstract

A laboratory scale external anaerobic dynamic membrane bioreactor (AnDMBR) treating high strength wastewater (influent COD ≈ 20 g/L) was operated to assess the effect of biogas sparging velocity (GSV) and hydraulic retention time (HRT) on removal efficiency and dynamic membrane (DM) filtration characteristics. An increase in GSV resulted in a decrease in DM filtration resistance. DM or cake layer was identified as the main contributor to the total filtration resistance. The external AnDMBR achieved over 99% COD removal efficiency irrespective of the GSV. The results showed that the DM formation process proceeded until a stable cake layer was reached. Reducing of HRT resulted in an increase in protein/carbohydrate ratio in soluble microbial products (SMP) and an increase in biomass concentration in the bioreactor. Therefore, HRT affected TMP and total filtration resistance in the AnDMBR. A high permeate quality was obtained by an effective DM layer at organic loading rates (OLRs) between 2 and 3.6 kg COD/m³ d. Based on the fluxes observed in this research, the filter cloth costs would be in the range of 0.17 €/m³ of treated wastewater. The investment and operational costs of the AnDMBRs are expected to be substantially lower than that of conventional membrane filtration.