Effects of Stepwise Adjustment of C/N during the Start-Up of Submerged Membrane Bioreactors (SMBRs) on the Aerobic Denitrification of Wastewater

Based on the improved high-efficiency sewage treatment performance of submerged membrane bioreactors (SMBRs), we focused on how to adjust the C/N ratio of the influent water during reactor start-up to prevent an excessive C/N ratio from causing membrane fouling. In this study, an experimental method...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Yinan Zhang, Yuxin Fang, Banglong Wang, Hangjun Zhang, Jiafeng Ding
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	microbial communities C/N ratio submerged membrane bioreactors (SMBRs) biofilm formation Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/a3c902042d55457f918cf26475d0098c
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:a3c902042d55457f918cf26475d0098c
record_format	dspace
spelling	oai:doaj.org-article:a3c902042d55457f918cf26475d0098c2021-11-25T19:15:59ZEffects of Stepwise Adjustment of C/N during the Start-Up of Submerged Membrane Bioreactors (SMBRs) on the Aerobic Denitrification of Wastewater10.3390/w132232512073-4441https://doaj.org/article/a3c902042d55457f918cf26475d0098c2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4441/13/22/3251https://doaj.org/toc/2073-4441Based on the improved high-efficiency sewage treatment performance of submerged membrane bioreactors (SMBRs), we focused on how to adjust the C/N ratio of the influent water during reactor start-up to prevent an excessive C/N ratio from causing membrane fouling. In this study, an experimental method of gradually adjusting the influent C/N ratio to quickly start the reactor was proposed, and the results showed that biofilm formation in R1 (SMBR, three influent C/N ratios of 5, 10, and 20) was approximately completed in 32 days, shorter than that (40 days) required in R2 (SMBR, influent C/N ratio of 20). Higher removal efficiencies of 76.4% for TN, 70.1% for COD, and 79.2% for NH<sub>3</sub>-N were obtained in R1 than in R2. The high-throughput sequencing results indicated that after 150 days of operation, the Shannon index of bacteria in R1 increased from 2.97 to 4.41 and the growth of <i>Nakamurella</i>, <i>Ferruginibacter</i>, and <i>Rhodanobacter</i> was promoted in the reactor, which indicated substantial microbial diversity in the biofilm. Therefore, gradually adjusting the influent C/N ratio could effectively enhance the nitrogen removal performance of denitrification microbial communities in SMBRs. This study offers a reliable approach for starting the SMBR-enhanced biological nutrient removal process in wastewater treatment plants by gradually adjusting the influent C/N ratio.Yinan ZhangYuxin FangBanglong WangHangjun ZhangJiafeng DingMDPI AGarticlemicrobial communitiesC/N ratiosubmerged membrane bioreactors (SMBRs)biofilm formationHydraulic engineeringTC1-978Water supply for domestic and industrial purposesTD201-500ENWater, Vol 13, Iss 3251, p 3251 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	microbial communities C/N ratio submerged membrane bioreactors (SMBRs) biofilm formation Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
spellingShingle	microbial communities C/N ratio submerged membrane bioreactors (SMBRs) biofilm formation Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Yinan Zhang Yuxin Fang Banglong Wang Hangjun Zhang Jiafeng Ding Effects of Stepwise Adjustment of C/N during the Start-Up of Submerged Membrane Bioreactors (SMBRs) on the Aerobic Denitrification of Wastewater
description	Based on the improved high-efficiency sewage treatment performance of submerged membrane bioreactors (SMBRs), we focused on how to adjust the C/N ratio of the influent water during reactor start-up to prevent an excessive C/N ratio from causing membrane fouling. In this study, an experimental method of gradually adjusting the influent C/N ratio to quickly start the reactor was proposed, and the results showed that biofilm formation in R1 (SMBR, three influent C/N ratios of 5, 10, and 20) was approximately completed in 32 days, shorter than that (40 days) required in R2 (SMBR, influent C/N ratio of 20). Higher removal efficiencies of 76.4% for TN, 70.1% for COD, and 79.2% for NH<sub>3</sub>-N were obtained in R1 than in R2. The high-throughput sequencing results indicated that after 150 days of operation, the Shannon index of bacteria in R1 increased from 2.97 to 4.41 and the growth of <i>Nakamurella</i>, <i>Ferruginibacter</i>, and <i>Rhodanobacter</i> was promoted in the reactor, which indicated substantial microbial diversity in the biofilm. Therefore, gradually adjusting the influent C/N ratio could effectively enhance the nitrogen removal performance of denitrification microbial communities in SMBRs. This study offers a reliable approach for starting the SMBR-enhanced biological nutrient removal process in wastewater treatment plants by gradually adjusting the influent C/N ratio.
format	article
author	Yinan Zhang Yuxin Fang Banglong Wang Hangjun Zhang Jiafeng Ding
author_facet	Yinan Zhang Yuxin Fang Banglong Wang Hangjun Zhang Jiafeng Ding
author_sort	Yinan Zhang
title	Effects of Stepwise Adjustment of C/N during the Start-Up of Submerged Membrane Bioreactors (SMBRs) on the Aerobic Denitrification of Wastewater
title_short	Effects of Stepwise Adjustment of C/N during the Start-Up of Submerged Membrane Bioreactors (SMBRs) on the Aerobic Denitrification of Wastewater
title_full	Effects of Stepwise Adjustment of C/N during the Start-Up of Submerged Membrane Bioreactors (SMBRs) on the Aerobic Denitrification of Wastewater
title_fullStr	Effects of Stepwise Adjustment of C/N during the Start-Up of Submerged Membrane Bioreactors (SMBRs) on the Aerobic Denitrification of Wastewater
title_full_unstemmed	Effects of Stepwise Adjustment of C/N during the Start-Up of Submerged Membrane Bioreactors (SMBRs) on the Aerobic Denitrification of Wastewater
title_sort	effects of stepwise adjustment of c/n during the start-up of submerged membrane bioreactors (smbrs) on the aerobic denitrification of wastewater
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/a3c902042d55457f918cf26475d0098c
work_keys_str_mv	AT yinanzhang effectsofstepwiseadjustmentofcnduringthestartupofsubmergedmembranebioreactorssmbrsontheaerobicdenitrificationofwastewater AT yuxinfang effectsofstepwiseadjustmentofcnduringthestartupofsubmergedmembranebioreactorssmbrsontheaerobicdenitrificationofwastewater AT banglongwang effectsofstepwiseadjustmentofcnduringthestartupofsubmergedmembranebioreactorssmbrsontheaerobicdenitrificationofwastewater AT hangjunzhang effectsofstepwiseadjustmentofcnduringthestartupofsubmergedmembranebioreactorssmbrsontheaerobicdenitrificationofwastewater AT jiafengding effectsofstepwiseadjustmentofcnduringthestartupofsubmergedmembranebioreactorssmbrsontheaerobicdenitrificationofwastewater
_version_	1718410112452788224

Effects of Stepwise Adjustment of C/N during the Start-Up of Submerged Membrane Bioreactors (SMBRs) on the Aerobic Denitrification of Wastewater

Ejemplares similares