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

Dalong Hu; Zhen Zhou; Xuelian Shen; Haijuan Wei; Lu Man Jiang; Yan Lv

doi:10.1016/j.biortech.2015.08.082

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

Dalong Hu
, Zhen Zhou^*
, Xuelian Shen
, Haijuan Wei
, Lu Man Jiang
, Yan Lv

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

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.

Original language	English
Pages (from-to)	217-226
Number of pages	10
Journal	Bioresource Technology
Volume	197
DOIs	https://doi.org/10.1016/j.biortech.2015.08.082
State	Published - 1 Dec 2015
Externally published	Yes

Keywords

Excitation-emission matrix
Extracellular polymeric substances
Fouling
Membrane bioreactor
Reject water

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.biortech.2015.08.082

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@article{e7f2ca6b668d4f6a9de3901e7b108ae8,

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

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.",

keywords = "Excitation-emission matrix, Extracellular polymeric substances, Fouling, Membrane bioreactor, Reject water",

author = "Dalong Hu and Zhen Zhou and Xuelian Shen and Haijuan Wei and Jiang, \{Lu Man\} and Yan Lv",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd.",

year = "2015",

month = dec,

day = "1",

doi = "10.1016/j.biortech.2015.08.082",

language = "英语",

volume = "197",

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TY - JOUR

T1 - Effects of alkalinity on membrane bioreactors for reject water treatment

T2 - Performance improvement, fouling mitigation and microbial structures

AU - Hu, Dalong

AU - Zhou, Zhen

AU - Shen, Xuelian

AU - Wei, Haijuan

AU - Jiang, Lu Man

AU - Lv, Yan

PY - 2015/12/1

Y1 - 2015/12/1

N2 - 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.

AB - 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.

KW - Excitation-emission matrix

KW - Extracellular polymeric substances

KW - Fouling

KW - Membrane bioreactor

KW - Reject water

UR - https://www.scopus.com/pages/publications/84940476214

U2 - 10.1016/j.biortech.2015.08.082

DO - 10.1016/j.biortech.2015.08.082

M3 - 文章

C2 - 26340030

AN - SCOPUS:84940476214

SN - 0960-8524

VL - 197

SP - 217

EP - 226

JO - Bioresource Technology

JF - Bioresource Technology

ER -

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

Abstract

Keywords

UN SDGs

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