Liu Kai
2007
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Journal
Environmental Science Survey
Abstract
Calcium hydroxide and calcium chloride were used in chemical precipitation of fluoride from integrated circuits wastewater.Under ambient temperature,the effect calcium dosage,pH and settling time of fluoride removal were studied.Results showed that calcium hydroxide was more suitable for application dosage and pH of 8.0,the fluoride concentration fell below 10 mg/l after 60 min of stagnant settling.The quality of treated effluent satisfied the first class of integrated wastewater discharge standard(GB8978-1996).