The dissolution characteristics of calcium sulfide and utilization as a precipitation agent in acidic wastewater effluent treatment

被引：10
作者：
Zvimba, J. N. [1 ]
Mulopo, J. [1 ]
De Beer, M. [1 ]
Bologo, L. [1 ]
Mashego, M. [1 ]
机构：
[1] CSIR, Pretoria, South Africa
来源：
WATER SCIENCE AND TECHNOLOGY | 2011年 / 63卷 / 12期
关键词：
calcium sulfide; dissolution; precipitation; wastewater effluent; METAL; REMOVAL;
D O I：
10.2166/wst.2011.599
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The dissolution characteristics of CaS in the presence of CO(2) has been investigated by monitoring sulfide speciation, solution conductivity and pH during dissolution. The sulfide speciation associated with CaS dissolution was utilized for metal precipitation from acidic wastewater effluents. The mechanism involved in the dissolution process was observed to be pH-dependent, characterized by increased solution conductivity as the HS(-) species becomes dominant in solution in the form of the Ca(HS)(2) complex. The replacement of HS(-) by CO(3)(2-) in the Ca(HS)(2) complex triggered CaCO(3) precipitation and H(2)S stripping and this was characterized by decreased solution pH and conductivity. The sulfide to total metal molar ratio was observed to have an effect on the pH and therefore sulfide speciation as well as extent of metal removal. The utilization of CaS in the treatment of acidic wastewater effluents demonstrated complete metal removal, with the potential of a pH-controlled selective metal removal and recovery.
引用
收藏
页码：2860 / 2866
页数：7
相关论文
共 22 条
[1]  
*APHA, 1992, STAND METH EX WAT WA
[2]  
BENEFIELD LD, 1982, PROC CHEM WATER WAST
[3]  
Bhattacharyya D., 1981, AICHE S SER WATER, P31
[4]  
GARRELS RM, 1958, GEOCHIM COSMOCHIM AC, V15, P113
[5]  
Jackson E., 1986, Hydrometallurgical extraction and reclamation
[6]  
Janaun J., 2006, J SUSTAIN SCI MANAG, V1, P58
[7]  
Kim B M., 1981, AIChE Symposium Series Vol, V77, No, P39
[8]  
Kim B.M., 1983, Environ. Progress, V2, P175, DOI DOI 10.1002/EP.670020309
[9]   An exploration into the sulphide precipitation method and its effect on metal sulphide removal [J].
Lewis, A ;
van Hille, R .
HYDROMETALLURGY, 2006, 81 (3-4) :197-204
[10]  
MARUYAMA T, 1975, J WATER POLLUT CON F, V47, P962
123