Impact of long-term salinity exposure in anaerobic membrane bioreactors treating phenolic wastewater: Performance robustness and endured microbial community

Water Research
Julian David Muñoz SierraJules B van Lier

Abstract

Industrial wastewaters are becoming increasingly associated with extreme conditions such as the presence of refractory compounds and high salinity that adversely affect biomass retention or reduce biological activity. Hence, this study evaluated the impact of long-term salinity increase to 20 gNa+.L-1 on the bioconversion performance and microbial community composition in anaerobic membrane bioreactors treating phenolic wastewater. Phenol removal efficiency of up to 99.9% was achieved at 14 gNa+.L-1. Phenol conversion rates of 5.1 mgPh.gVSS-1.d-1, 4.7 mgPh.gVSS-1.d-1, and 11.7 mgPh.gVSS-1.d-1 were obtained at 16 gNa+.L-1,18 gNa+.L-1 and 20 gNa+.L-1, respectively. The AnMBR's performance was not affected by short-term step-wise salinity fluctuations of 2 gNa+.L-1 in the last phase of the experiment. It was also demonstrated in batch tests that the COD removal and methane production rate were higher at a K+:Na+ ratio of 0.05, indicating the importance of potassium to maintain the methanogenic activity. The salinity increase adversely affected the transmembrane pressure likely due to a particle size decrease from 185 μm at 14 gNa+.L-1 to 16 μm at 20 gNa+.L-1. Microbial community was dominated by bacteria belonging to the Clostridi...Continue Reading

Citations

Jul 1, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Sara ArabiValetta Saldanha
Jun 4, 2019·Frontiers in Bioengineering and Biotechnology·Magela OdriozolaJules B van Lier
Jan 16, 2020·Environmental Science and Pollution Research International·Jing WangWei Wang
Oct 27, 2020·Frontiers in Bioengineering and Biotechnology·Julian D Muñoz SierraJules B van Lier
Nov 25, 2020·Biodegradation·K J HidalgoDagoberto Y Okada
Feb 26, 2021·Applied Microbiology and Biotechnology·M Concetta TomeiLorenzo Brusetti
Jul 30, 2020·Journal of Environmental Management·Jing JiXiangkai Li
Jun 30, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Tales Abreu Tavares de SousaJosé Tavares de Sousa
Nov 12, 2021·ACS Applied Materials & Interfaces·Chao XingShanqing Zhang

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