電芬頓法處理絡(luò)合銅鎳電鍍廢水試驗(yàn)研究
[Abstract]:The complex heavy metal in electroplating wastewater is the key point in the treatment of this kind of wastewater, and the key to the effective removal of complex heavy metals lies in the breaking of the complex. At present, Fenton oxidation is often used to break the wastewater, but this method has many problems, such as high sludge yield, long residence time and low utilization rate of chemicals. Compared with the traditional Fenton method, the electric Fenton method has the advantages of high utilization ratio of H_2O_2 and Fe2, low sludge production and so on. It can effectively treat the electroplating wastewater containing complex heavy metals and avoid the shortcomings of the traditional Fenton process. The selection of electrode materials is very important in electric Fenton. Although there have been many related research results, the preparation of electrode materials is difficult and the price is too high to be applied in practice. In this paper, iron, aluminum and graphite, which are easily available in the market and low price, will be taken as the research object. By comparing the treatment effect and cost of different electrode materials for wastewater containing Ni-EDTA and Cu-EDTA, the optimal electrode materials which can be used in practical engineering will be selected. On the basis of this, the suitable operating condition parameters of the process are determined by small scale test and pilot-scale operation. The main factors affecting the treatment of copper and nickel complex wastewater by electric Fenton method with iron, aluminum and graphite as electrodes were investigated through a small scale experiment. The treatment efficiency and treatment cost of the three electrode materials under the optimum conditions were compared synthetically. The experimental results show that the three electrode materials, electric Fenton method, have a good removal effect on both Ni-EDTA and Cu-EDTA simulated wastewater. After comprehensive comparison, the iron electrode is optimal. When the initial pH value is 2.0, the current density is 20 Ma / cm ~ (-2) and the hydrogen peroxide dosage is 6 mL/L h, the removal rates of Ni and Cu are 98.54% and 99.8% respectively, and the comprehensive cost is 12.75 yuan / ton water. The process parameters and characteristics of Cu/Ni-EDTA wastewater were optimized by using simulated wastewater. The experimental results show that when the electrode spacing is 2 cm, the current density is 20 Ma / cm ~ (-2), the hydrogen peroxide is continuously added and the dosage is 6 mL/L / h, the existence of heavy metal to achieve a better removal effect. Citric acid and hypophosphate can inhibit the electric Fenton method of iron electrode. The removal of Ni and Cu in the treatment of Cu/Ni-EDTA simulated wastewater by ferroelectric Fenton method was mainly carried out by flocculation and precipitation of metal ions and hydroxide precipitation by adding OH-. At the same time, a small amount of metal ions moved to the plate with the current adsorption and removal. For the actual wastewater, the main process parameters of the electric Fenton process were determined under the conditions of different complex state heavy metal concentrations (2-30 mg/L). Under the conditions of residence time 0.5 ~ (-1) h, hydrogen peroxide dosage 3.4-8.5 mL/L / h, current density 20-30 mA/cm~2, Cu and Ni can be discharged stably, and COD and TP can be removed to some extent.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:X781.1
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