Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon

Powered Activated Carbon – Membrane Bioreactors (PAC-MBRs) have been used with good results for slightly polluted water treatment. Our batch experiments showed that the transmembrane pressure of a PAC-MBR was 25% less than that of a MBR in one period of test, which indicated that PAC did help contro...

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Autores principales:	Yongji Zhang, Xiaotong Wang, Hexiu Ye, Lingling Zhou, Zhiling Zhao
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	membrane fouling pac-mbrs slightly polluted source water surface morphologies Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/ffc2a2b5ccbf40ea817cbf1c325593ae
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spelling	oai:doaj.org-article:ffc2a2b5ccbf40ea817cbf1c325593ae2021-11-06T10:50:37ZEffect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon0273-12231996-973210.2166/wst.2021.037https://doaj.org/article/ffc2a2b5ccbf40ea817cbf1c325593ae2021-03-01T00:00:00Zhttp://wst.iwaponline.com/content/83/5/1005https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Powered Activated Carbon – Membrane Bioreactors (PAC-MBRs) have been used with good results for slightly polluted water treatment. Our batch experiments showed that the transmembrane pressure of a PAC-MBR was 25% less than that of a MBR in one period of test, which indicated that PAC did help control the fouling in MBRs. Based on this observation, several mechanisms of membrane fouling of MBRs and PAC-MBRs were investigated to have some insight into how PAC brought a positive impact. The total resistances decreased by 60% and different resistances were redistributed after adding PAC. The dominant one changed from filtration resistance to cake resistance. These smaller cake resistances resulted from the PAC because, showing in the scanning electron microscopy pictures, it made the cake layer looser and rougher than that on a normal membrane. Meanwhile, the analysis of the membrane eluent showed that the addition of PAC changed the microbial species and its metabolites on the membrane and effectively reduced the adsorption of hydrophilic organic molecules on the membrane surface. Additionally, PAC prevented polypeptide compounds from being trapped inside the pores of membranes, so the cake on the PAC-MBR contaminated membrane surface was easier to scrape off. In the test of cleaning methods, alkaline cleaning removed the most organics from contaminated membranes to restore membrane performance.Yongji ZhangXiaotong WangHexiu YeLingling ZhouZhiling ZhaoIWA Publishingarticlemembrane foulingpac-mbrsslightly polluted source watersurface morphologiesEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 5, Pp 1005-1016 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	membrane fouling pac-mbrs slightly polluted source water surface morphologies Environmental technology. Sanitary engineering TD1-1066
spellingShingle	membrane fouling pac-mbrs slightly polluted source water surface morphologies Environmental technology. Sanitary engineering TD1-1066 Yongji Zhang Xiaotong Wang Hexiu Ye Lingling Zhou Zhiling Zhao Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon
description	Powered Activated Carbon – Membrane Bioreactors (PAC-MBRs) have been used with good results for slightly polluted water treatment. Our batch experiments showed that the transmembrane pressure of a PAC-MBR was 25% less than that of a MBR in one period of test, which indicated that PAC did help control the fouling in MBRs. Based on this observation, several mechanisms of membrane fouling of MBRs and PAC-MBRs were investigated to have some insight into how PAC brought a positive impact. The total resistances decreased by 60% and different resistances were redistributed after adding PAC. The dominant one changed from filtration resistance to cake resistance. These smaller cake resistances resulted from the PAC because, showing in the scanning electron microscopy pictures, it made the cake layer looser and rougher than that on a normal membrane. Meanwhile, the analysis of the membrane eluent showed that the addition of PAC changed the microbial species and its metabolites on the membrane and effectively reduced the adsorption of hydrophilic organic molecules on the membrane surface. Additionally, PAC prevented polypeptide compounds from being trapped inside the pores of membranes, so the cake on the PAC-MBR contaminated membrane surface was easier to scrape off. In the test of cleaning methods, alkaline cleaning removed the most organics from contaminated membranes to restore membrane performance.
format	article
author	Yongji Zhang Xiaotong Wang Hexiu Ye Lingling Zhou Zhiling Zhao
author_facet	Yongji Zhang Xiaotong Wang Hexiu Ye Lingling Zhou Zhiling Zhao
author_sort	Yongji Zhang
title	Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon
title_short	Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon
title_full	Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon
title_fullStr	Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon
title_full_unstemmed	Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon
title_sort	effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/ffc2a2b5ccbf40ea817cbf1c325593ae
work_keys_str_mv	AT yongjizhang effectandmechanismofreducedmembranebioreactorfoulingbypowderedactivatedcarbon AT xiaotongwang effectandmechanismofreducedmembranebioreactorfoulingbypowderedactivatedcarbon AT hexiuye effectandmechanismofreducedmembranebioreactorfoulingbypowderedactivatedcarbon AT linglingzhou effectandmechanismofreducedmembranebioreactorfoulingbypowderedactivatedcarbon AT zhilingzhao effectandmechanismofreducedmembranebioreactorfoulingbypowderedactivatedcarbon
_version_	1718443834030948352

Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon

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