Membrane fouling mitigation in a moving bed membrane bioreactor combined with anoxic biofilter for treatment of saline wastewater from mariculture

Weilong Song; Hong You; Zhipeng Li; Feng Liu; Peishi Qi; Fang Wang; Yizhu Li

doi:10.1016/j.biortech.2017.07.092

Membrane fouling mitigation in a moving bed membrane bioreactor combined with anoxic biofilter for treatment of saline wastewater from mariculture

Bioresour Technol. 2017 Nov:243:1051-1058. doi: 10.1016/j.biortech.2017.07.092. Epub 2017 Jul 18.

Authors

Weilong Song¹, Hong You², Zhipeng Li³, Feng Liu², Peishi Qi¹, Fang Wang⁴, Yizhu Li⁴

Affiliations

¹ State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
² State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China; School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China.
³ School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China. Electronic address: lizhipengcn@hit.edu.cn.
⁴ School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China.

PMID: 28764107
DOI: 10.1016/j.biortech.2017.07.092

Abstract

Membrane fouling mitigation in a novel AF-MBMBR system (moving bed membrane bioreactor (10L) coupled with anoxic biofilter (4L)) under high salinity condition (35‰) was systematically investigated. Pre-positioned AF served as a pretreatment induced significant decrease of suspended biomass by 85% and dissolved organic matters by 51.7% in subsequent MBR, which resulted in a reduction of cake layer formation. Based on this, sponge bio-carriers in MBMBR further alleviated the fouling propensity by modifying extracellular polymeric substances (EPS) properties. The protein component in EPS decreased from 181.4 to 116.5mg/g MLSS, with a decline of protein/carbohydrate ratio from 4.6 to 3.4. In particular, elimination of hydrophobic groups like aromatic protein-like substance in EPS was detected. These caused the less biomass deposition on membrane surface, thereby alleviating membrane fouling. In summary, mitigation of membrane fouling in AF-MBMBR should be attributed to contributions from both pre-positioned AF and sponge bio-carriers.

Keywords: Mariculture; Membrane fouling mitigation; Moving bed membrane bioreactor; Pre-positioned anoxic biofilter; Saline wastewater.

MeSH terms

Biomass
Bioreactors*
Membranes, Artificial
Salinity
Wastewater*

Substances

Membranes, Artificial
Waste Water