Application of a modified biological flocculant in total nitrogen treatment of leather wastewater

Leather wastewater harms the ecological environment and human health. In this study, a modified bio-flocculant was prepared to facilitate treatment of leather wastewater. A bio-flocculant produced by Bacillus cereus was combined with amphoteric starch and modified using a cerium ammonium nitrate ini...

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Autores principales:	Yizhuo Zhang, Qinhuan Yang, Hongxia Gao, Yang Zhao, Xuan Tang, Changqing Zhao, Chunyu Fang
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	amphoteric starch bio-flocculant graft copolymerization orthogonal optimization tannery wastewater total nitrogen removal Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/2871fa5579634552b47c6ee0eefdc723
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spelling	oai:doaj.org-article:2871fa5579634552b47c6ee0eefdc7232021-11-06T11:09:39ZApplication of a modified biological flocculant in total nitrogen treatment of leather wastewater0273-12231996-973210.2166/wst.2021.192https://doaj.org/article/2871fa5579634552b47c6ee0eefdc7232021-06-01T00:00:00Zhttp://wst.iwaponline.com/content/83/12/2901https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Leather wastewater harms the ecological environment and human health. In this study, a modified bio-flocculant was prepared to facilitate treatment of leather wastewater. A bio-flocculant produced by Bacillus cereus was combined with amphoteric starch and modified using a cerium ammonium nitrate initiator. Single factor optimization and orthogonal optimization were used to determine the optimal preparation conditions as follows: amphoteric starch-to-flocculant ratio = 22:30; reaction temperature = 64 °C; initiator dosage = 2.00%; reaction time = 15 min; stirring speed = 600 rpm; and flocculation system pH = 8.0. At a dosage of 1 g/L added to simulated leather industry wastewater, the flocculation efficiency (98.17%) and the total nitrogen removal efficiency (100.00%) of modified bio-flocculant was superior to that achieved by 1 g/L of unmodified bio-flocculant (72.16% and 50.00%, respectively), amphoteric starch (8.50% and 0.00%) and polyacrylamide (95.55% and 75.00%). Analysis of natural and flocculated precipitates in the wastewater showed that the modified bio-flocculant significantly changed several characteristics of the flocculated particles; in addition, it promoted the removal of nitrogenous substances in the process of denitrification. These changes helped explain the material's flocculating ability. The results confirmed that the modified bio-flocculant was an effective additive for treating leather wastewater. HIGHLIGHTS A modified biological flocculant was successfully prepared by using biological flocculant and amphoteric starch.; The modified biological flocculant has an excellent treatment effect on leather wastewater.; The flocculation rate of leather wastewater can reach 98.17%, and the removal rate of total nitrogen can reach 100%.;Yizhuo ZhangQinhuan YangHongxia GaoYang ZhaoXuan TangChangqing ZhaoChunyu FangIWA Publishingarticleamphoteric starchbio-flocculantgraft copolymerizationorthogonal optimizationtannery wastewatertotal nitrogen removalEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 12, Pp 2901-2910 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	amphoteric starch bio-flocculant graft copolymerization orthogonal optimization tannery wastewater total nitrogen removal Environmental technology. Sanitary engineering TD1-1066
spellingShingle	amphoteric starch bio-flocculant graft copolymerization orthogonal optimization tannery wastewater total nitrogen removal Environmental technology. Sanitary engineering TD1-1066 Yizhuo Zhang Qinhuan Yang Hongxia Gao Yang Zhao Xuan Tang Changqing Zhao Chunyu Fang Application of a modified biological flocculant in total nitrogen treatment of leather wastewater
description	Leather wastewater harms the ecological environment and human health. In this study, a modified bio-flocculant was prepared to facilitate treatment of leather wastewater. A bio-flocculant produced by Bacillus cereus was combined with amphoteric starch and modified using a cerium ammonium nitrate initiator. Single factor optimization and orthogonal optimization were used to determine the optimal preparation conditions as follows: amphoteric starch-to-flocculant ratio = 22:30; reaction temperature = 64 °C; initiator dosage = 2.00%; reaction time = 15 min; stirring speed = 600 rpm; and flocculation system pH = 8.0. At a dosage of 1 g/L added to simulated leather industry wastewater, the flocculation efficiency (98.17%) and the total nitrogen removal efficiency (100.00%) of modified bio-flocculant was superior to that achieved by 1 g/L of unmodified bio-flocculant (72.16% and 50.00%, respectively), amphoteric starch (8.50% and 0.00%) and polyacrylamide (95.55% and 75.00%). Analysis of natural and flocculated precipitates in the wastewater showed that the modified bio-flocculant significantly changed several characteristics of the flocculated particles; in addition, it promoted the removal of nitrogenous substances in the process of denitrification. These changes helped explain the material's flocculating ability. The results confirmed that the modified bio-flocculant was an effective additive for treating leather wastewater. HIGHLIGHTS A modified biological flocculant was successfully prepared by using biological flocculant and amphoteric starch.; The modified biological flocculant has an excellent treatment effect on leather wastewater.; The flocculation rate of leather wastewater can reach 98.17%, and the removal rate of total nitrogen can reach 100%.;
format	article
author	Yizhuo Zhang Qinhuan Yang Hongxia Gao Yang Zhao Xuan Tang Changqing Zhao Chunyu Fang
author_facet	Yizhuo Zhang Qinhuan Yang Hongxia Gao Yang Zhao Xuan Tang Changqing Zhao Chunyu Fang
author_sort	Yizhuo Zhang
title	Application of a modified biological flocculant in total nitrogen treatment of leather wastewater
title_short	Application of a modified biological flocculant in total nitrogen treatment of leather wastewater
title_full	Application of a modified biological flocculant in total nitrogen treatment of leather wastewater
title_fullStr	Application of a modified biological flocculant in total nitrogen treatment of leather wastewater
title_full_unstemmed	Application of a modified biological flocculant in total nitrogen treatment of leather wastewater
title_sort	application of a modified biological flocculant in total nitrogen treatment of leather wastewater
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/2871fa5579634552b47c6ee0eefdc723
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Application of a modified biological flocculant in total nitrogen treatment of leather wastewater

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