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

Yizhuo Zhang | Zendy; Qinhuan Yang | Zendy; Hongxia Gao | Zendy; Yang Zhao | Zendy; Xuan Tang | Zendy; Changqing Zhao | Zendy; Fang Chun-yu | Zendy

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

Author(s) -

Yizhuo Zhang,

Qinhuan Yang,

Hongxia Gao,

Yang Zhao,

Xuan Tang,

Changqing Zhao,

Fang Chun-yu

Publication year - 2021

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2021.192

Subject(s) - flocculation , wastewater , chemistry , pulp and paper industry , polyacrylamide , sewage treatment , ammonium , bacillus cereus , starch , chromatography , environmental engineering , organic chemistry , environmental science , polymer chemistry , biology , bacteria , engineering , genetics

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.

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