The Studies Of The Combinationtechnology Of Micro-electrolysis And Electroflocculation Deal With Lead And Zinc Smelting Waste Water

Lead-zinc smelting industry is one of the main large pollutant emissions with heavy metal in the non-ferrous metal industry. Lead-zinc smelting wastewater is complex, and well bring serious environmental pollution. It including heavy metals (lead, zinc, cadmium, chromium, cobalt, nickel, copper, etc.), arsenic, acids, fluorides, chlorides, etc.. Currently, the main treatment method of lead and zinc smelting wastewater is lime precipitation, sulfide precipitation, and ferrite, but these methods can not meet the actual need.Therefore an urgent need for a high efficiency and availability treatment technology for treatment with lead and zinc smelting waste water. The iron-carbon micro-electrolysis technology is a simple, inexpensive and effective wastewater treatment technologies used in wastewater treatment technology, is currently one of the hotspots in the field. Luo fa Sheng et al. studied the iron-carbon micro-electrolysis-flocculation treatment with wastewater, their findings proved that the micro-electrolysis-flocculation is an efficient, simple, low-cost technology. However, the electrode potential than iron heavy metal ions and arsenic treatment rate is still low, the final water reuse will bring some problems to the smelting process. Electrolysis is a more mature treatment process, through flocculation, complexation, redox, flotation and combined effects to removal contaminants from the water. The technology is high efficiency, low concentration waste water removal efficiency is also good, but the technology is the high energy consumption, and require high influent pH.This study on the basis of the the other people’study,is proposed a new type of micro-electrolysis-electroflocculation coupling technique to treat lead and zinc smelting waste water from Mengzi Mining Company Limited’s actual situation and the processing requirements. The final water reaches the surface III types of water standards. In this study, the test analysis of the orthogonal experimental design conditions of come to the following conclusion:the micro-electrolysis water pH is the most important impact of factors affecting the treatment effect, electrolytic pH is the second. The technology of the coupling process parameters:the pH of the beginning of the micro-electrolysis is2.5, reaction time of micro-electrolysis is35min, the iron-carbon mass ratio is2.5:2, dosage of the PAM is 2ppm, electrolytic pH is6, the pressure of electrolytic is2V, time of electrolysis25min, the spacing of plate1.4cm, two flocculation pHis9.5,two flocculation PAM dosage is5.25ppm; Under the optimum conditions of the micro-electrolysis-electricity, Cu2+of the effluent water is0.026mg/L, Zn2+of the effluent water is <0.001mg/L, Cd2+of the effluent water is0.002mg/L, Pb2+of the effluent water is of the effluent water is,and total As of the effluent water is0.012mg/L, all of they are reached the surface of III types of water standards.Addition, compare the treatment effect and other economic and technical indicators with lime precipitation、micro-electrolysis-flocculation, lime precipitation-electroflocculation, and lime precipitation-electrodeposition, find this technical feasibility and superiority. The study by scanning electron microscopy and spectroscopy analysis (SEM and EDS), the surface of iron-carbon before and after micro-electrolysis and the product of electrolytic-flocculation combined with the respective reaction process simple analysis of the mechanism; Analysis the interaction of the ion by the Nernst equation and cyclic voltammetry. In short, experimental studies have shown that "micro-electrolysis electricity flocculation coupling technology is an effective and feasible new technology.This study is to solve the problem of heavy metal pollution in smelting waste water, afford a useful and new technology to the smelting waste water treatment.