Effects of alkalinity on membrane bioreactors for reject water treatment: Performance improvement, fouling mitigation and microbial structures

Bioresource Technology
Dalong HuYan Lv

Abstract

Two submerged membrane bioreactors (MBRs) for reject water treatment were operated to investigate effects of sodium bicarbonate (SB) addition on enhancing process performance and mitigating membrane fouling. Results showed that SB addition enhanced average removal efficiencies of COD and NH4-N by 14.6% and 38.3%, respectively. With SB addition, the extracellular polymeric substances (EPS) content in activated sludge increased, but those in membrane foulants greatly decreased. Gel permeation chromatography analysis demonstrated that EPS in MBRs for reject water treatment had much larger molecular weight (MW) and broader MW distribution than those in MBRs for municipal wastewater treatment. The fouling mitigation by SB was attributed to a deprotonation mechanism reduced EPS adsorption on negatively charged membrane surfaces, and improvement of degradation efficiency of macromolecular organic matters. SB addition into MBRs for reject water treatment increased microbial abundance, enriched nitrifying bacteria, and converted predominant AOB genus from Nitrosomonas to Nitrosospira.

References

Apr 17, 2003·Water Research·S SalemM C M Van Loosdrecht
Feb 3, 2009·Water Science and Technology : a Journal of the International Association on Water Pollution Research·L M WhangS S Cheng
Dec 24, 2011·Environmental Science & Technology·Ling-Ling WangXiang-Ke Wang
May 15, 2012·Journal of Microbiology and Biotechnology·Agnieszka Cydzik-KwiatkowskaIrena Wojnowska-Baryła
Oct 26, 2013·Current Microbiology·Shuang GengXiao-Lei Wu

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Citations

Jul 18, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Khush Bakht Andleeb, Imran Hashmi
Sep 28, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Weixiao DouXiaoyun Fei
Dec 5, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Xiaodan ZhaoZhan Qiu
Dec 21, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Wenjiao SangCuihua Li

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