The Pilot Study of the Influence of Free Ammonia on Membrane Fouling during the Partial Nitrosation of Pig Farm Anaerobic Digestion Liquid

The problem of membrane fouling is a key factor restricting the application of the membrane bioreactor (MBR) in the partial nitrosation (PN) and anaerobic ammonia oxidation (anammox) processes. In this study, the pilot-scale continuous flow MBR was used to start up the partial nitrosation process in...

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Autores principales:	Hanxiao Bian, Zhiping Zhu, Qianwen Sui, Shunli Wang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	membrane bioreactor free ammonia partial nitrosation membrane fouling Chemical technology TP1-1185 Chemical engineering TP155-156
Acceso en línea:	https://doaj.org/article/237f0623e77143d3b9f835a8048e2f77
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spelling	oai:doaj.org-article:237f0623e77143d3b9f835a8048e2f772021-11-25T18:20:09ZThe Pilot Study of the Influence of Free Ammonia on Membrane Fouling during the Partial Nitrosation of Pig Farm Anaerobic Digestion Liquid10.3390/membranes111108942077-0375https://doaj.org/article/237f0623e77143d3b9f835a8048e2f772021-11-01T00:00:00Zhttps://www.mdpi.com/2077-0375/11/11/894https://doaj.org/toc/2077-0375The problem of membrane fouling is a key factor restricting the application of the membrane bioreactor (MBR) in the partial nitrosation (PN) and anaerobic ammonia oxidation (anammox) processes. In this study, the pilot-scale continuous flow MBR was used to start up the partial nitrosation process in order to investigate the change trend of mid-transmembrane pressure (TMP) in the process of start-up, which was further explored to clarify the membrane fouling mechanism in the pilot-scale reactor. The results showed that the MBR system was in a stable operating condition during the partial nitrosation operation and that the online automatic backwash operation mode is beneficial in alleviating membrane fouling and reducing the cost of membrane washing. Particular attention was paid to the influence trend of free ammonia (FA)on membrane fouling, and it was found that the increase in FA concentration plays the most critical role in membrane fouling. The increase in FA concentration led to an increase in the extracellular polymer (EPS), dissolved microorganism product (SMP) and soluble chemical oxygen demand (SCOD) concentration. FA was extremely significantly correlated with EPS and SCOD, and the FA concentration was approximately 20.7 mg/L. The SCOD<sub>eff</sub> (effluent SCOD concentration) concentration was approximately 147 mg/L higher than the SCOD<sub>inf</sub> (influent SCOD concentration) concentration. FA mainly affects membrane fouling by affecting the concentration of EPS and SCOD.Hanxiao BianZhiping ZhuQianwen SuiShunli WangMDPI AGarticlemembrane bioreactorfree ammoniapartial nitrosationmembrane foulingChemical technologyTP1-1185Chemical engineeringTP155-156ENMembranes, Vol 11, Iss 894, p 894 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	membrane bioreactor free ammonia partial nitrosation membrane fouling Chemical technology TP1-1185 Chemical engineering TP155-156
spellingShingle	membrane bioreactor free ammonia partial nitrosation membrane fouling Chemical technology TP1-1185 Chemical engineering TP155-156 Hanxiao Bian Zhiping Zhu Qianwen Sui Shunli Wang The Pilot Study of the Influence of Free Ammonia on Membrane Fouling during the Partial Nitrosation of Pig Farm Anaerobic Digestion Liquid
description	The problem of membrane fouling is a key factor restricting the application of the membrane bioreactor (MBR) in the partial nitrosation (PN) and anaerobic ammonia oxidation (anammox) processes. In this study, the pilot-scale continuous flow MBR was used to start up the partial nitrosation process in order to investigate the change trend of mid-transmembrane pressure (TMP) in the process of start-up, which was further explored to clarify the membrane fouling mechanism in the pilot-scale reactor. The results showed that the MBR system was in a stable operating condition during the partial nitrosation operation and that the online automatic backwash operation mode is beneficial in alleviating membrane fouling and reducing the cost of membrane washing. Particular attention was paid to the influence trend of free ammonia (FA)on membrane fouling, and it was found that the increase in FA concentration plays the most critical role in membrane fouling. The increase in FA concentration led to an increase in the extracellular polymer (EPS), dissolved microorganism product (SMP) and soluble chemical oxygen demand (SCOD) concentration. FA was extremely significantly correlated with EPS and SCOD, and the FA concentration was approximately 20.7 mg/L. The SCOD<sub>eff</sub> (effluent SCOD concentration) concentration was approximately 147 mg/L higher than the SCOD<sub>inf</sub> (influent SCOD concentration) concentration. FA mainly affects membrane fouling by affecting the concentration of EPS and SCOD.
format	article
author	Hanxiao Bian Zhiping Zhu Qianwen Sui Shunli Wang
author_facet	Hanxiao Bian Zhiping Zhu Qianwen Sui Shunli Wang
author_sort	Hanxiao Bian
title	The Pilot Study of the Influence of Free Ammonia on Membrane Fouling during the Partial Nitrosation of Pig Farm Anaerobic Digestion Liquid
title_short	The Pilot Study of the Influence of Free Ammonia on Membrane Fouling during the Partial Nitrosation of Pig Farm Anaerobic Digestion Liquid
title_full	The Pilot Study of the Influence of Free Ammonia on Membrane Fouling during the Partial Nitrosation of Pig Farm Anaerobic Digestion Liquid
title_fullStr	The Pilot Study of the Influence of Free Ammonia on Membrane Fouling during the Partial Nitrosation of Pig Farm Anaerobic Digestion Liquid
title_full_unstemmed	The Pilot Study of the Influence of Free Ammonia on Membrane Fouling during the Partial Nitrosation of Pig Farm Anaerobic Digestion Liquid
title_sort	pilot study of the influence of free ammonia on membrane fouling during the partial nitrosation of pig farm anaerobic digestion liquid
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/237f0623e77143d3b9f835a8048e2f77
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The Pilot Study of the Influence of Free Ammonia on Membrane Fouling during the Partial Nitrosation of Pig Farm Anaerobic Digestion Liquid

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