| Our country, China, is a developing country and the economy has been growing at a high speed. At the same time, the amount of industrial solid waste is also increasing rapidly. Industrial solid waste which contains heavy metal can pollute the enviroment more seriously. What is worse, it often affect human health. Therefore, the study on stabilization/solidification of industrial solid waste is very essential.Several different technologies on stabilization/solidification of three kinds of industrial solid waste are studied in this essay. Materials used in the experiment are cement, lime, sludge, Mg O, Na2 S, KS-101 and KS-201. The optimum process conditions are determined by orthogonal tests. The cost is also calculated.The stabilization/solidification of arsenic sulfide waste are studied using cement, lime, sludge, Mg O. The result shows that the optimum process conditions are as follows: sludge=2.0g/g,lime=1.0g/g,Mg O=0.01g/g, cement=0.4g/g.The concentration of As in the leachate can be reduced from 1762mg/L to 1.37mg/L. It can meet the standard of GB18598-2001(2.5mg/L). Two ton sludge is needed for dispose of arsenic sulfide waste. The aim of dealing waste with waste is reached.The stabilization/solidification of nickel waste and zinc waste are studied using Na2 S, KS-101, KS-201 and cement. The result shows that the optimum process conditions are as follows: Na2S=0.07g/g(0.03g/g), KS-101=0.02g/g(0.02g/g), KS-201=0.03g/g(0.03g/g), cement=0.2g/g(0.2g/g). The concentrations of Ni and Zn in the leachate can be reduced from 1587mg/L and 1438 mg/L to 2.09mg/L and 2.92 mg/L. It can meet the standard of GB18598-2001(Ni:15 mg/L, Zn:75 mg/L). The mechanism of stabilization/solidification is also studied.Using cement solidification and chelating agent stabilization combined and waste to dispose waste, not only processing effect is improved but also more effective utilization of landfill. |
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