Removal of sulfamethoxazole (SMX) in sulfate-reducing flocculent and granular sludge systems

Lin-Qing Qiu; Liang Zhang; Kai Tang; Guanghao Chen; Samir Kumar Khanal; Hui Lu

doi:10.1016/j.biortech.2019.121592

Removal of sulfamethoxazole (SMX) in sulfate-reducing flocculent and granular sludge systems

Lin-Qing Qiu, Liang Zhang, Kai Tang, Guanghao Chen, Samir Kumar Khanal, Hui Lu^*

^*Corresponding author for this work

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Abstract

This study investigated sulfamethoxazole (SMX) removal and fate in sulfate-reducing up-flow sludge bed (SRUSB) reactors inoculated with sulfate-reducing bacteria (SRB) granules and flocs. The resilience of SRB granules and flocs against varying pHs and hydraulic retention times (HRTs) was also examined. SRB granules and flocs efficiently removed SMX from wastewater, which was significantly higher than the aerobic sludge. SRB granules achieved significantly (p < 0.05) higher SMX removal (∼13.3 μg/g suspended solids (SS)-d) than the SRB flocs (∼11.2 μg/g SS-d) during 150-day of SRUSB reactors operation. The SMX removal by both granules and flocs was mainly attributed to biodegradation. Sorption also contributed to SMX removal, in which aromatic protein-like substances of extracellular polymeric substances played important role in SMX removal. In addition, SRB granules showed higher resilience than SRB flocs against varying pHs and HRTs. Thus, SRB-mediated biological process, especially SRB granules, could be a promising biotechnology to remove SMX from wastewaters.

Original language	English
Article number	121592
Journal	Bioresource Technology
Volume	288
Number of pages	9
ISSN	0960-8524
DOIs	https://doi.org/10.1016/j.biortech.2019.121592
Publication status	Published - 2019

Keywords

Sulfamethoxazole (SMX)
Sulfate reducting bacteria (SRB) granules and flocs
Biodegradation
Adsorption
Extracellular polymeric substances (EPS)

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title = "Removal of sulfamethoxazole (SMX) in sulfate-reducing flocculent and granular sludge systems",

abstract = "This study investigated sulfamethoxazole (SMX) removal and fate in sulfate-reducing up-flow sludge bed (SRUSB) reactors inoculated with sulfate-reducing bacteria (SRB) granules and flocs. The resilience of SRB granules and flocs against varying pHs and hydraulic retention times (HRTs) was also examined. SRB granules and flocs efficiently removed SMX from wastewater, which was significantly higher than the aerobic sludge. SRB granules achieved significantly (p < 0.05) higher SMX removal (∼13.3 μg/g suspended solids (SS)-d) than the SRB flocs (∼11.2 μg/g SS-d) during 150-day of SRUSB reactors operation. The SMX removal by both granules and flocs was mainly attributed to biodegradation. Sorption also contributed to SMX removal, in which aromatic protein-like substances of extracellular polymeric substances played important role in SMX removal. In addition, SRB granules showed higher resilience than SRB flocs against varying pHs and HRTs. Thus, SRB-mediated biological process, especially SRB granules, could be a promising biotechnology to remove SMX from wastewaters.",

keywords = "Sulfamethoxazole (SMX), Sulfate reducting bacteria (SRB) granules and flocs, Biodegradation, Adsorption, Extracellular polymeric substances (EPS)",

author = "Lin-Qing Qiu and Liang Zhang and Kai Tang and Guanghao Chen and {Kumar Khanal}, Samir and Hui Lu",

year = "2019",

doi = "10.1016/j.biortech.2019.121592",

language = "English",

volume = "288",

journal = "Bioresource Technology",

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T1 - Removal of sulfamethoxazole (SMX) in sulfate-reducing flocculent and granular sludge systems

AU - Qiu, Lin-Qing

AU - Zhang, Liang

AU - Tang, Kai

AU - Chen, Guanghao

AU - Kumar Khanal, Samir

AU - Lu, Hui

PY - 2019

Y1 - 2019

N2 - This study investigated sulfamethoxazole (SMX) removal and fate in sulfate-reducing up-flow sludge bed (SRUSB) reactors inoculated with sulfate-reducing bacteria (SRB) granules and flocs. The resilience of SRB granules and flocs against varying pHs and hydraulic retention times (HRTs) was also examined. SRB granules and flocs efficiently removed SMX from wastewater, which was significantly higher than the aerobic sludge. SRB granules achieved significantly (p < 0.05) higher SMX removal (∼13.3 μg/g suspended solids (SS)-d) than the SRB flocs (∼11.2 μg/g SS-d) during 150-day of SRUSB reactors operation. The SMX removal by both granules and flocs was mainly attributed to biodegradation. Sorption also contributed to SMX removal, in which aromatic protein-like substances of extracellular polymeric substances played important role in SMX removal. In addition, SRB granules showed higher resilience than SRB flocs against varying pHs and HRTs. Thus, SRB-mediated biological process, especially SRB granules, could be a promising biotechnology to remove SMX from wastewaters.

AB - This study investigated sulfamethoxazole (SMX) removal and fate in sulfate-reducing up-flow sludge bed (SRUSB) reactors inoculated with sulfate-reducing bacteria (SRB) granules and flocs. The resilience of SRB granules and flocs against varying pHs and hydraulic retention times (HRTs) was also examined. SRB granules and flocs efficiently removed SMX from wastewater, which was significantly higher than the aerobic sludge. SRB granules achieved significantly (p < 0.05) higher SMX removal (∼13.3 μg/g suspended solids (SS)-d) than the SRB flocs (∼11.2 μg/g SS-d) during 150-day of SRUSB reactors operation. The SMX removal by both granules and flocs was mainly attributed to biodegradation. Sorption also contributed to SMX removal, in which aromatic protein-like substances of extracellular polymeric substances played important role in SMX removal. In addition, SRB granules showed higher resilience than SRB flocs against varying pHs and HRTs. Thus, SRB-mediated biological process, especially SRB granules, could be a promising biotechnology to remove SMX from wastewaters.

KW - Sulfamethoxazole (SMX)

KW - Sulfate reducting bacteria (SRB) granules and flocs

KW - Biodegradation

KW - Adsorption

KW - Extracellular polymeric substances (EPS)

U2 - 10.1016/j.biortech.2019.121592

DO - 10.1016/j.biortech.2019.121592

M3 - Journal article

C2 - 31176940

SN - 0960-8524

VL - 288

JO - Bioresource Technology

JF - Bioresource Technology

M1 - 121592

ER -

Removal of sulfamethoxazole (SMX) in sulfate-reducing flocculent and granular sludge systems

Abstract

Keywords

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