Effects of hydraulic retention time on adsorption behaviours of EPS in an A/O-MBR: biofouling study with QCM-D

Abstract Extra-cellular polymeric substances (EPS) are a major cause of membrane fouling in membrane bioreactors (MBRs). In this study, an anoxic–oxic membrane bioreactor (A/O-MBR) was run continuously for 98 days. The runs were divided into three stages according to hydraulic retention time (HRT) (...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Xudong Wang, Botao Cheng, Cunrui Ji, Miao Zhou, Lei Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/991d1b7346304c21a93c0a365ee699b2
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:991d1b7346304c21a93c0a365ee699b2
record_format	dspace
spelling	oai:doaj.org-article:991d1b7346304c21a93c0a365ee699b22021-12-02T16:06:55ZEffects of hydraulic retention time on adsorption behaviours of EPS in an A/O-MBR: biofouling study with QCM-D10.1038/s41598-017-03190-12045-2322https://doaj.org/article/991d1b7346304c21a93c0a365ee699b22017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03190-1https://doaj.org/toc/2045-2322Abstract Extra-cellular polymeric substances (EPS) are a major cause of membrane fouling in membrane bioreactors (MBRs). In this study, an anoxic–oxic membrane bioreactor (A/O-MBR) was run continuously for 98 days. The runs were divided into three stages according to hydraulic retention time (HRT) (11.8, 12.5 and 14.3 h, respectively). EPS were extracted from the reactor under the different HRTs. A quartz crystal microbalance with dissipation monitoring (QCM-D) and Fourier transform infrared (FT–IR) were used to study the adherence layer structures and the adsorption behaviours of EPS on the membrane surface. The results indicated that the removal rate of TN was more susceptible to HRT than NH3-N. The observations in the QCM-D suggested that at the lowest HRT (11.8 h), the structure of the adsorption layer is loose and soft and the fluidity was better than for HRTs of 12.5 or 14.3 h. It is likely one of the major reasons for the rapidly blocking of the membrane pores. Furthermore, the higher EPS adherence as analyzed in the QCM-D and EPS concentration could induce a higher osmotic pressure effect, leading to a rapid membrane-fouling rate.Xudong WangBotao ChengCunrui JiMiao ZhouLei WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xudong Wang Botao Cheng Cunrui Ji Miao Zhou Lei Wang Effects of hydraulic retention time on adsorption behaviours of EPS in an A/O-MBR: biofouling study with QCM-D
description	Abstract Extra-cellular polymeric substances (EPS) are a major cause of membrane fouling in membrane bioreactors (MBRs). In this study, an anoxic–oxic membrane bioreactor (A/O-MBR) was run continuously for 98 days. The runs were divided into three stages according to hydraulic retention time (HRT) (11.8, 12.5 and 14.3 h, respectively). EPS were extracted from the reactor under the different HRTs. A quartz crystal microbalance with dissipation monitoring (QCM-D) and Fourier transform infrared (FT–IR) were used to study the adherence layer structures and the adsorption behaviours of EPS on the membrane surface. The results indicated that the removal rate of TN was more susceptible to HRT than NH3-N. The observations in the QCM-D suggested that at the lowest HRT (11.8 h), the structure of the adsorption layer is loose and soft and the fluidity was better than for HRTs of 12.5 or 14.3 h. It is likely one of the major reasons for the rapidly blocking of the membrane pores. Furthermore, the higher EPS adherence as analyzed in the QCM-D and EPS concentration could induce a higher osmotic pressure effect, leading to a rapid membrane-fouling rate.
format	article
author	Xudong Wang Botao Cheng Cunrui Ji Miao Zhou Lei Wang
author_facet	Xudong Wang Botao Cheng Cunrui Ji Miao Zhou Lei Wang
author_sort	Xudong Wang
title	Effects of hydraulic retention time on adsorption behaviours of EPS in an A/O-MBR: biofouling study with QCM-D
title_short	Effects of hydraulic retention time on adsorption behaviours of EPS in an A/O-MBR: biofouling study with QCM-D
title_full	Effects of hydraulic retention time on adsorption behaviours of EPS in an A/O-MBR: biofouling study with QCM-D
title_fullStr	Effects of hydraulic retention time on adsorption behaviours of EPS in an A/O-MBR: biofouling study with QCM-D
title_full_unstemmed	Effects of hydraulic retention time on adsorption behaviours of EPS in an A/O-MBR: biofouling study with QCM-D
title_sort	effects of hydraulic retention time on adsorption behaviours of eps in an a/o-mbr: biofouling study with qcm-d
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/991d1b7346304c21a93c0a365ee699b2
work_keys_str_mv	AT xudongwang effectsofhydraulicretentiontimeonadsorptionbehavioursofepsinanaombrbiofoulingstudywithqcmd AT botaocheng effectsofhydraulicretentiontimeonadsorptionbehavioursofepsinanaombrbiofoulingstudywithqcmd AT cunruiji effectsofhydraulicretentiontimeonadsorptionbehavioursofepsinanaombrbiofoulingstudywithqcmd AT miaozhou effectsofhydraulicretentiontimeonadsorptionbehavioursofepsinanaombrbiofoulingstudywithqcmd AT leiwang effectsofhydraulicretentiontimeonadsorptionbehavioursofepsinanaombrbiofoulingstudywithqcmd
_version_	1718384791903010816

Effects of hydraulic retention time on adsorption behaviours of EPS in an A/O-MBR: biofouling study with QCM-D

Ejemplares similares