標題: Treatment of high-level arsenic-containing wastewater by fluidized bed crystallization process
作者: Huang, Chihpin
Pan, Jill R.
Lee, Maosung
Yen, Shihming
環境工程研究所
Institute of Environmental Engineering
關鍵字: arsenic;arsenic sulfide;fluidized bed crystallization;GaAs wastewater
公開日期: 1-Mar-2007
摘要: Gallium arsenide technology has been widely applied in the communication and optical electronics industries. The process of chip manufacturing produces a stream of wastewater unique in its low flow rate and high arsenic concentration. Fluidized bed crystallization (FBC) technology combines the advantages of a fluidized bed reactor and crystallization. It is highly efficient with low capital and operational costs, while producing no sludge. The waste from the FBC is small in volume, high in crystal purity and recyclable. Jar tests were first performed to evaluate the precipitation of arsenic sulfide. Then a lab-scale fluidized bed reactor was applied to screen critical operational parameters and the process was optimized to meet the wastewater discharge standard. The results obtained in this study confirmed that the FBC process is capable of treating wastewater containing high concentrations of arsenic, reducing the concentration to mu g L-1 levels. Sulfide dosage and operating pH are the two most significant parameters determining the residual arsenic concentration of the effluent, with optimum conditions of pH = 2 and S/As = 2.2 to meet the local discharge limit. (c) 2007 Society of Chemical Industry
URI: http://dx.doi.org/10.1002/jctb.1671
http://hdl.handle.net/11536/11036
ISSN: 0268-2575
DOI: 10.1002/jctb.1671
期刊: JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Volume: 82
Issue: 3
起始頁: 289
結束頁: 294
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