Optimization of electrocoagulation process parameters for enhancing phosphate removal in a biofilm-electrocoagulation system

This study aimed to enhance the removal of phosphate in synthetic rural sewage by using a continuous electrocoagulation (EC) combined with biofilm process in an integrated system. Characteristic indexes of biofilm process effluent covering pH, dissolved oxygen (DO), suspended solids (SS), chemical o...

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Autores principales:	Jie Zeng, Min Ji, Yingxin Zhao, Thomas Helmer Pedersen, Hao Wang
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	biofilm system box-behnken design combination electrocoagulation periodic polarity switching phosphate removal Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/ae0bec480fa246f6874fce6ff35915d6
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spelling	oai:doaj.org-article:ae0bec480fa246f6874fce6ff35915d62021-11-06T11:05:47ZOptimization of electrocoagulation process parameters for enhancing phosphate removal in a biofilm-electrocoagulation system0273-12231996-973210.2166/wst.2021.132https://doaj.org/article/ae0bec480fa246f6874fce6ff35915d62021-05-01T00:00:00Zhttp://wst.iwaponline.com/content/83/10/2560https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732This study aimed to enhance the removal of phosphate in synthetic rural sewage by using a continuous electrocoagulation (EC) combined with biofilm process in an integrated system. Characteristic indexes of biofilm process effluent covering pH, dissolved oxygen (DO), suspended solids (SS), chemical oxygen demand (COD) and phosphate maintained a narrow fluctuation range and tended not readily to influence the phosphate removal of subsequent electrocoagulation. Three parameters including inter-electrode distance, current intensity and reaction time were selected to investigate the performance of enhancing phosphate removal. On the strength of single-factor tests, the Box-Behnken design (BBD) coupled with response surface methodology (RSM) was applied to investigate the individual and mutual interaction impacts of the major operating parameters and to optimize conditions. The optimum conditions were found to be inter-electrode distance of 1.8 cm, current density of 2.1 mA/cm2 and EC reaction time of 34 min, and phosphate removal efficiency of 90.24% was achieved along with less than 1 mg/L in case of periodic polarity switching mode, which raised removal efficiency by 10.10% and reduced operating cost by 0.13 CNY/g PO4− compared to non-switching mode. The combination of biofilm processing and electrocoagulation treatment was proven to be a valid and feasible method for enhancing phosphate removal. HIGHLIGHTS The combined biofilm and EC system was used to enhance phosphate removal.; BBD was applied to optimize various operation parameters on phosphate removal.; Phosphate removal of 90.24% was observed at optimal conditions.; Utilization of periodic polarity switching achieved a better effect.;Jie ZengMin JiYingxin ZhaoThomas Helmer PedersenHao WangIWA Publishingarticlebiofilm systembox-behnken designcombinationelectrocoagulationperiodic polarity switchingphosphate removalEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 10, Pp 2560-2574 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	biofilm system box-behnken design combination electrocoagulation periodic polarity switching phosphate removal Environmental technology. Sanitary engineering TD1-1066
spellingShingle	biofilm system box-behnken design combination electrocoagulation periodic polarity switching phosphate removal Environmental technology. Sanitary engineering TD1-1066 Jie Zeng Min Ji Yingxin Zhao Thomas Helmer Pedersen Hao Wang Optimization of electrocoagulation process parameters for enhancing phosphate removal in a biofilm-electrocoagulation system
description	This study aimed to enhance the removal of phosphate in synthetic rural sewage by using a continuous electrocoagulation (EC) combined with biofilm process in an integrated system. Characteristic indexes of biofilm process effluent covering pH, dissolved oxygen (DO), suspended solids (SS), chemical oxygen demand (COD) and phosphate maintained a narrow fluctuation range and tended not readily to influence the phosphate removal of subsequent electrocoagulation. Three parameters including inter-electrode distance, current intensity and reaction time were selected to investigate the performance of enhancing phosphate removal. On the strength of single-factor tests, the Box-Behnken design (BBD) coupled with response surface methodology (RSM) was applied to investigate the individual and mutual interaction impacts of the major operating parameters and to optimize conditions. The optimum conditions were found to be inter-electrode distance of 1.8 cm, current density of 2.1 mA/cm2 and EC reaction time of 34 min, and phosphate removal efficiency of 90.24% was achieved along with less than 1 mg/L in case of periodic polarity switching mode, which raised removal efficiency by 10.10% and reduced operating cost by 0.13 CNY/g PO4− compared to non-switching mode. The combination of biofilm processing and electrocoagulation treatment was proven to be a valid and feasible method for enhancing phosphate removal. HIGHLIGHTS The combined biofilm and EC system was used to enhance phosphate removal.; BBD was applied to optimize various operation parameters on phosphate removal.; Phosphate removal of 90.24% was observed at optimal conditions.; Utilization of periodic polarity switching achieved a better effect.;
format	article
author	Jie Zeng Min Ji Yingxin Zhao Thomas Helmer Pedersen Hao Wang
author_facet	Jie Zeng Min Ji Yingxin Zhao Thomas Helmer Pedersen Hao Wang
author_sort	Jie Zeng
title	Optimization of electrocoagulation process parameters for enhancing phosphate removal in a biofilm-electrocoagulation system
title_short	Optimization of electrocoagulation process parameters for enhancing phosphate removal in a biofilm-electrocoagulation system
title_full	Optimization of electrocoagulation process parameters for enhancing phosphate removal in a biofilm-electrocoagulation system
title_fullStr	Optimization of electrocoagulation process parameters for enhancing phosphate removal in a biofilm-electrocoagulation system
title_full_unstemmed	Optimization of electrocoagulation process parameters for enhancing phosphate removal in a biofilm-electrocoagulation system
title_sort	optimization of electrocoagulation process parameters for enhancing phosphate removal in a biofilm-electrocoagulation system
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/ae0bec480fa246f6874fce6ff35915d6
work_keys_str_mv	AT jiezeng optimizationofelectrocoagulationprocessparametersforenhancingphosphateremovalinabiofilmelectrocoagulationsystem AT minji optimizationofelectrocoagulationprocessparametersforenhancingphosphateremovalinabiofilmelectrocoagulationsystem AT yingxinzhao optimizationofelectrocoagulationprocessparametersforenhancingphosphateremovalinabiofilmelectrocoagulationsystem AT thomashelmerpedersen optimizationofelectrocoagulationprocessparametersforenhancingphosphateremovalinabiofilmelectrocoagulationsystem AT haowang optimizationofelectrocoagulationprocessparametersforenhancingphosphateremovalinabiofilmelectrocoagulationsystem
_version_	1718443753810690048

Optimization of electrocoagulation process parameters for enhancing phosphate removal in a biofilm-electrocoagulation system

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