The Treatment Of Contained Heavy Metals Flotation Wastewater By Pulse Electrolysis-enhanced Micro-electrolysis Fluidized Bed Method

In recent years, significant heavy metal pollution incidents have erupted because of the emission of containing heavy metals pollutant by non-ferrous metals industry, which seriously threat people’s life and property safety. Therefore, the control of heavy metal pollution is both the key aspect and difficult aspect of the current environmental pollution control in China, which already has drawn great attention of state and government at all levels. Countries have issued a series of policies, laws and regulations to reduce the emission of heavy metals, and reduce the heavy metal pollution. In2011, the "twelfth five-year" plan for the prevention and control of heavy metal pollution obtained the formal approval of the state council, Hunan, Sichuan, Yunnan and other14provinces were listed as the key management areas, and the country planed to invest a lot of money and encouraged the research on related technology and theory of heavy metals.For non-ferrous metal ore dressing in flotation wastewater containing heavy metal ions and flotation reagents at the same time, a new method of pulse electrolysis-enhanced micro-electro lysis fluidized bed method was developed based on traditional micro electrolysis, which wad used to research the flotation and removal of heavy metals in wastewater and flotation reagents.In the experiment of treating simulated wastewater with the method of pulse electrolysis-enhanced micro-electro lysis fluidized bed, the initial pH of4the solution, current density of20mA/cm2, pulse cycle for2s, plate spacing is5mm meet the optimal experiment condition. Under the optimal experiment condition, the residual concentration of Cu2+, Pb2+, Zn2+, butyl xanthate, amino-dithiophosphate and CODcr in effluent reached0.024mg/L respectively,0.131mg/L,0.151mg/L,1.23mg/L,0.58mg/L and46.6mg/L respectively, removal rate reached99.44%,99.7%,94.43%,99.08%,81.89%and99.08%respectively. Meanwhile, the value of BOD5/CODCr in increased from0.564to0.739, greatly improving the actual wastewater biological sex.The method of impulse current strengthen micro electrolysis in the fluidized bed technology and flocculation precipitation and the method of microbial flocculation method were employed at the same time to deal with the actual wastewater, resulting in the residual concentration of Cu2+, Pb2+, Zn2+, butyl xanthate and amino-dithiophosphate in practical wastewater reached0.003mg/L,0.012mg/L,0.017mg/L,0.031mg/L and0.028mg/L respectively, and the removal rate reached99.93%,99.97%,99.37%,99.77%and91.25%respectively, both of which meet the first-level value of the Integrated wastewater discharge standard"(GB8978-1996).The method of the pulse electro lysis-enhanced micro-electrolysis fluidized bed method, the method of direct current-enhanced micro-electrolysis fluidized bed method and the method of micro-electrolysis fluidized bed method were compared with each other for their treatment effect on practical wastewater. The results showed that the method of pulse electro lysis-enhanced micro-electro lysis fluidized bed method was best, and the method of direct current-enhanced micro-electrolysis fluidized bed was better.