Structural characteristics of cake layer in membrane bioreactor with chromate exposure.

Author(s) Zhou, L.; Ye, B.; Xia, S.
Journal Ecotoxicol Environ Saf
Date Published 2019 Mar
Abstract

Chromate (CrO) exposure, especially high concentration (mg/L), still probably occurs in the industrial and mining area due to industrial accidents or even illegal discharge, though CrO has been restricted to be discharged into wastewater treatment system (WWTS). Therefore, this study was applied to better understand the structural characteristics of cake layer in membrane bioreactor (MBR), which is one of best alternative for WWTS of industrial or mining area, with CrO exposure. Three submerged MBRs with CrO exposure (10 mg/L was normal high concentration CrO; 50 mg/L as extreme level for better identification; 0 mg/L as control condition) were applied in this study. Results showed that CrO exposure caused an obvious variation of cake layer structure. Because of organic component variation, cake layer structure with CrO exposure was re-constructed into loose and porous with biomicromolecules, and resulted in the rapid cake layer thickness increase, finally leading to severe membrane biofouling. Additionally, CrO distributed evenly along the cross-sectional cake layer. CrO only induced the inorganic structure variations of cake layer, but without any obvious effects on the other inorganic elements structure. CrO exposure induced the bacterial community structure variation and led to tolerated-CrO microorganisms as the majority in cake layer community, but had no obvious effects on the population diversity.

DOI 10.1016/j.ecoenv.2018.11.056
ISSN 1090-2414
Citation Zhou L, Ye B, Xia S. Structural characteristics of cake layer in membrane bioreactor with chromate exposure. Ecotoxicol Environ Saf. 2019;169:583-589.

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