Parametric optimization of cyanobacterial coagulation at exponential and decline phases by combining polyaluminum chloride and cationic polyacrylamide

Microcystis spp. is the most common and problematic species during cyanobacterial bloom. This study employed Microcystis aeruginosa for coagulation experiments. Effects of polyaluminum chloride (PAC), cationic polyacrylamide (CPAM), and pH value on cyanobacterial removal at exponential and decline p...

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Autores principales:	Weijun Song, Yu Xie, Jiapeng Hu, Xunfang Wu, Xi Li
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	cationic polyacrylamide coagulation cyanobacterial growth phase polyaluminum chloride response surface methodology successive bloom Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/7e99d66169ec42a9a5821e37aff659c9
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spelling	oai:doaj.org-article:7e99d66169ec42a9a5821e37aff659c92021-11-05T17:03:14ZParametric optimization of cyanobacterial coagulation at exponential and decline phases by combining polyaluminum chloride and cationic polyacrylamide2709-80282709-803610.2166/aqua.2021.110https://doaj.org/article/7e99d66169ec42a9a5821e37aff659c92021-05-01T00:00:00Zhttp://aqua.iwaponline.com/content/70/3/317https://doaj.org/toc/2709-8028https://doaj.org/toc/2709-8036Microcystis spp. is the most common and problematic species during cyanobacterial bloom. This study employed Microcystis aeruginosa for coagulation experiments. Effects of polyaluminum chloride (PAC), cationic polyacrylamide (CPAM), and pH value on cyanobacterial removal at exponential and decline phases by coagulation were investigated by measuring chlorophyll a. A mathematical model between factors and response variables was established using response surface methodology (RSM). Results showed that factors of CPAM dosage, PAC dosage, and pH value could strongly affect the removal ratio of Microcystis at both exponential and decline phases. RSM revealed that the order of influence factors on the removal of chlorophyll a was CPAM > PAC > pH for Microcystis at the exponential phase, and these orders of CPAM > PAC > pH (PAC coagulation) and CPAM > PAC > pH (CPAM coagulation) were for Microcystis at the decline phase. It suggested that the growth phase of cyanobacteria was also quite important to optimize the coagulation process. Besides, a fitted model was developed, and it could well predict the removal ratio of chlorophyll a by coagulation with various treatments. The model recommended dosages of CPAM (3.72 mg/L) and PAC (10.23 mg/L) for Microcystis at the exponential phase with a pH value of 8.25, and dosages of CPAM (5.98 mg/L) and PAC (17.81 mg/L) were for Microcystis at the decline phase with a pH value of 8.21. Overall, these results would provide a technical guideline of combining PAC and CPAM to treat cyanobacteria at exponential and decline phases. HIGHLIGHTS Effects of PAC, CPAM, and pH differed for Microcystis at exponential and decline phases.; Interaction between PAC and CPAM dosages was significant during coagulation.; Fitted models could well predict the actual removal ratio of Microcystis by coagulation.; The removal ratio of Microcystis reached 82.49–94.38% with optimized dosages of PAC and CPAM.;Weijun SongYu XieJiapeng HuXunfang WuXi LiIWA Publishingarticlecationic polyacrylamidecoagulationcyanobacterial growth phasepolyaluminum chlorideresponse surface methodologysuccessive bloomEnvironmental technology. Sanitary engineeringTD1-1066Environmental sciencesGE1-350ENAqua, Vol 70, Iss 3, Pp 317-327 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cationic polyacrylamide coagulation cyanobacterial growth phase polyaluminum chloride response surface methodology successive bloom Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350
spellingShingle	cationic polyacrylamide coagulation cyanobacterial growth phase polyaluminum chloride response surface methodology successive bloom Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Weijun Song Yu Xie Jiapeng Hu Xunfang Wu Xi Li Parametric optimization of cyanobacterial coagulation at exponential and decline phases by combining polyaluminum chloride and cationic polyacrylamide
description	Microcystis spp. is the most common and problematic species during cyanobacterial bloom. This study employed Microcystis aeruginosa for coagulation experiments. Effects of polyaluminum chloride (PAC), cationic polyacrylamide (CPAM), and pH value on cyanobacterial removal at exponential and decline phases by coagulation were investigated by measuring chlorophyll a. A mathematical model between factors and response variables was established using response surface methodology (RSM). Results showed that factors of CPAM dosage, PAC dosage, and pH value could strongly affect the removal ratio of Microcystis at both exponential and decline phases. RSM revealed that the order of influence factors on the removal of chlorophyll a was CPAM > PAC > pH for Microcystis at the exponential phase, and these orders of CPAM > PAC > pH (PAC coagulation) and CPAM > PAC > pH (CPAM coagulation) were for Microcystis at the decline phase. It suggested that the growth phase of cyanobacteria was also quite important to optimize the coagulation process. Besides, a fitted model was developed, and it could well predict the removal ratio of chlorophyll a by coagulation with various treatments. The model recommended dosages of CPAM (3.72 mg/L) and PAC (10.23 mg/L) for Microcystis at the exponential phase with a pH value of 8.25, and dosages of CPAM (5.98 mg/L) and PAC (17.81 mg/L) were for Microcystis at the decline phase with a pH value of 8.21. Overall, these results would provide a technical guideline of combining PAC and CPAM to treat cyanobacteria at exponential and decline phases. HIGHLIGHTS Effects of PAC, CPAM, and pH differed for Microcystis at exponential and decline phases.; Interaction between PAC and CPAM dosages was significant during coagulation.; Fitted models could well predict the actual removal ratio of Microcystis by coagulation.; The removal ratio of Microcystis reached 82.49–94.38% with optimized dosages of PAC and CPAM.;
format	article
author	Weijun Song Yu Xie Jiapeng Hu Xunfang Wu Xi Li
author_facet	Weijun Song Yu Xie Jiapeng Hu Xunfang Wu Xi Li
author_sort	Weijun Song
title	Parametric optimization of cyanobacterial coagulation at exponential and decline phases by combining polyaluminum chloride and cationic polyacrylamide
title_short	Parametric optimization of cyanobacterial coagulation at exponential and decline phases by combining polyaluminum chloride and cationic polyacrylamide
title_full	Parametric optimization of cyanobacterial coagulation at exponential and decline phases by combining polyaluminum chloride and cationic polyacrylamide
title_fullStr	Parametric optimization of cyanobacterial coagulation at exponential and decline phases by combining polyaluminum chloride and cationic polyacrylamide
title_full_unstemmed	Parametric optimization of cyanobacterial coagulation at exponential and decline phases by combining polyaluminum chloride and cationic polyacrylamide
title_sort	parametric optimization of cyanobacterial coagulation at exponential and decline phases by combining polyaluminum chloride and cationic polyacrylamide
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/7e99d66169ec42a9a5821e37aff659c9
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_version_	1718444108028051456

Parametric optimization of cyanobacterial coagulation at exponential and decline phases by combining polyaluminum chloride and cationic polyacrylamide

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