Preparation of Diatomite Composite Flocculant and Its Coagulation Efficiency for Polluted Seawater

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Abstract

Purification and activation of raw diatomite were operated by calcination and alkaline treatment. The raw diatomite and purified diatomite were characterized by BET adsorption and scanning electron microscopy (SEM) to determine the optimal condition of calcination and alkaline treatment. The diatomite composite flocculant was prepared by using purified diatomite and ferric sulphate. The removal efficiency of ammonium nitrogen (NH₃-N), total phosphorous (TP) and COD_Mn were investigated by coagulation with diatomite composite flocculant. The optimal calcination temperature for the raw diatomite produced from Jinlin Changbai was 500 ℃. The NaOH concentration of alkaline treatment for diatomite-101 and diatomite-104 were 1 mol/L and 4 mol/L respectively. After purification and activation, the micropores structure was more evident and the specific surface area was higher. The excellent coagulation effects were obtained when the diatomite composite flocculant was prepared by placing purified diatomite with ferric sulphate at the ratio of 9:1. At the diatomite composite flocculant dosing rate of 60 mg/L, the removal efficiencies for NH₃-N, TP and COD_Mn were 26.25%, 94.81% and 44.42% respectively. A comparison between ferric sulphate and diatomite composite flocculant showed that the removal efficiencies for NH₃-N, TP and COD_Mn were improved by 3.93%, 12.54% and 6.09% respectively.

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	Articles by authors
	Wang Wenhua
	Jiang Tianxiang
	Zhang Xiaoqing
	Qiu Jinquan
	Wang Jing
	Zhang Yushan

Keywords： diatomite； polluted seawater； coagulation； removal efficiency

Received 2014-03-19;

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Wang Wenhua, Jiang Tianxiang, Zhang Xiaoqing, Qiu Jinquan, Wang Jing, Zhang Yushan.Preparation of Diatomite Composite Flocculant and Its Coagulation Efficiency for Polluted Seawater[J] Chemcial Industry and Engineering, 2015,V32(6): 41-46

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