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2014•Advanced materials researchOpen access

Flocculant Screening for the Pretreatment of Printing and Dyeing Wastewater

Shan Hong Lan, Ping Ma, Shi Wen Geng, Jia Hao Sun, Hui Xia Lan, Heng Zhang

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Abstract

Study on the pretreatment of printing and dyeing wastewater with PAC、Fe2(SO4)3and FeCl3was carried out. Effects of the flocculants dosage, pH on the treatment efficiency were studied. The results showed that with PAC, Fe2(SO4)3and the FeCl3dosage rising, the treatment effect first decreased and then increased and when the addition amount was 300 mg.L-1、300mg.L-1and 250 mg.L-1,the COD removal efficiency achieved 69%、78%、74% , respectively. With the rising of pH, the treatment effects of the three types of flocculants increased first and then decreased, the optimum pH of PAC and Fe2(SO4)3was 7and the best pH of FeCl3was 6. At last, the settle ability and the amount of the producing floc were studied, the results showed that the settle ability was the best and the least amount of sludge produced by FeCl3flocculation. Keywords: printing and dyeing wastewater, pretreatment, flocculants, screening.

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What this paper is about

Study on the pretreatment of printing and dyeing wastewater with PAC、Fe2(SO4)3and FeCl3was carried out. Effects of the flocculants dosage, pH on the treatment efficiency were studied. The results showed that with PAC, Fe2(SO4)3and the FeCl3dosage rising, the treatment effect first decreased and then increased and when the addition amount was 300 mg.L-1、300mg.L-1and 250 mg.L-1,the COD removal efficiency achieved 69%、78%、74% , respectively. With the rising of pH, the treatment effects of the three types of flocculants increased first and then decreased, the optimum pH of PAC and Fe2(SO4)3was 7and the best pH of FeCl3was 6. At last, the settle ability and the amount of the producing floc were studied, the results showed that the settle ability was the best and the least amount of sludge produced by FeCl3flocculation. Keywords: printing and dyeing wastewater, pretreatment, flocculants, screening.

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Available abstract

Study on the pretreatment of printing and dyeing wastewater with PAC、Fe2(SO4)3and FeCl3was carried out. Effects of the flocculants dosage, pH on the treatment efficiency were studied. The results showed that with PAC, Fe2(SO4)3and the FeCl3dosage rising, the treatment effect first decreased and then increased and when the addition amount was 300 mg.L-1、300mg.L-1and 250 mg.L-1,the COD removal efficiency achieved 69%、78%、74% , respectively. With the rising of pH, the treatment effects of the three types of flocculants increased first and then decreased, the optimum pH of PAC and Fe2(SO4)3was 7and the best pH of FeCl3was 6. At last, the settle ability and the amount of the producing floc were studied, the results showed that the settle ability was the best and the least amount of sludge produced by FeCl3flocculation. Keywords: printing and dyeing wastewater, pretreatment, flocculants, screening.

Key concepts: Flocculation, Wastewater, Chemistry, Dyeing, Nuclear chemistry, Pulp and paper industry, Chromatography, Treatment effect

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