Biopolymeric flocculant extracted from potato residues using alkaline extraction method and its application in removing coal fly ash from ash-flushing wastewater generated from coal fired power plant

Weijie Liu; Yan Hao; Jihong Jiang; Cong Liu; Aihua Zhu; Jingrong Zhu; Zhen Dong

doi:10.3934/environsci.2017.1.27

AIMS Environmental Science, 2017, 4(1): 27-41. doi: 10.3934/environsci.2017.1.27. Research article

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Biopolymeric flocculant extracted from potato residues using alkaline extraction method and its application in removing coal fly ash from ash-flushing wastewater generated from coal fired power plant

Weijie Liu, Yan Hao, Jihong Jiang, Cong Liu, Aihua Zhu, Jingrong Zhu, Zhen Dong

School of Life Science, The Key Laboratory of Biotechnology for Medicinal Plant of Jiangsu Province, Jiangsu Normal University, Xuzhou 221116, Jiangsu Province, China
† These authors contributed equally to this work.

Received: , Accepted: , Published:

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Ash-flushing wastewater generated by coal fired power plant generally contains high massive suspended coal fly ashes, which limit the recycling of ash-flushing wastewater and contaminate the environment due to the release of heavy metals from coal fly ashes. In this study, the Biopolymeric Flocculant extracted from Potato Residues (BFPR) under alkaline condition was applied to treat ash-flushing wastewater. The extraction conditions were optimized. The results showed that the highest yield of 58.77% BFPR was extracted from potato residues under the optimum condition: temperature 100 °C, potato residue concentration 42.09 g/L, extraction time 25.27 min, NaOH concentration 0.48 M and MgSO4•7H2O concentration 0.4 g/L. Gel permeation chromatography analysis indicated that the approximate molecular weight (MW) of BFPR was 4781 kDa. Fourier transform infrared spectroscopy indicated the presence of carboxyl, hydroxyl, and methoxyl groups in BFPR. Furthermore, BFPR showed good flocculating efficiency of 93.44% to ash-flushing wastewater when 8.3 mg/L BFPR was added, and thus achieved the recycling of ash-flushing wastewater.

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Keywords: biopolymeric flocculant; potato residues; coal fly ashes; ash-flushing wastewater

Citation: Weijie Liu, Yan Hao, Jihong Jiang, Cong Liu, Aihua Zhu, Jingrong Zhu, Zhen Dong. Biopolymeric flocculant extracted from potato residues using alkaline extraction method and its application in removing coal fly ash from ash-flushing wastewater generated from coal fired power plant. AIMS Environmental Science, 2017, 4(1): 27-41. doi: 10.3934/environsci.2017.1.27

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