微电解技术及其组合工艺预处理直接染料废水实验研究

发布时间：2018-05-29 05:52

本文选题：直接染料废水 + 预处理　；参考：《兰州大学》2015年硕士论文

【摘要】：直接染料是染料行业产量最大的一类染料。直接染料废水具有水量大、成分复杂、色度高、酸碱度变化大、可生化性差等特点,处理难度大,需要对其进行预处理。传统废水预处理技术(如吸附法、臭氧氧化法等)处理直接染料废水都存在着处理效果不好或处理成本高等不足,研究经济有效的直接染料废水预处理技术具有较强的理论意义以及社会实践价值。本文针对配制的直接染料大红废水进行染料废水处理模拟研究。采用微电解技术对直接染料废水进行预处理,以色度去除率和COD去除率作为评价指标,通过多次单因素实验确定微电解技术预处理染料废水的最佳条件,确定最佳条件后扩大废水处理规模。针对出水颜色偏黄问题,在微电解技术处理后采用絮凝沉淀法和砂滤技术对出水做进一步深度预处理,提高废水的处理效果。研究成果如下：(1)微电解技术预处理染料废水的最佳反应条件为：pH为1.2-1.3,铁碳比为1：1,铁碳投加量为45克/L(废水)；该条件下废水色度去除率在99%左右；COD去除率30%左右。(2)染料废水经过微电解技术预处理后再进行絮凝沉淀和砂滤处理,可使出水色度与COD去除率分别提高至99.8%、60%左右；同时可将出水中99.9%以上的铁去除。(3)与单独微电解技术相比,微电解联合絮凝沉淀法及砂滤技术处理模拟染料废水能够更加有效地去除废水色度和COD,提高废水处理效果。
[Abstract]:Direct dyes are the most productive dyes in the dyestuff industry. Direct dye wastewater has the characteristics of large water quantity, complex composition, high chromaticity, large change of pH and alkalinity, poor biodegradability and so on. Traditional wastewater pretreatment techniques (such as adsorption, ozone oxidation, etc.) for direct dye wastewater treatment have some shortcomings, such as poor treatment efficiency or high treatment cost. It is of great theoretical significance and social practical value to study the economic and effective pretreatment technology of direct dye wastewater. In this paper, the treatment of direct dye red wastewater was simulated. The direct dyestuff wastewater was pretreated by microelectrolysis technology. The color removal rate and COD removal rate were taken as the evaluation indexes. The optimum conditions for pretreatment of dyestuff wastewater by microelectrolysis technology were determined through many single factor experiments. The scale of wastewater treatment was expanded after the optimum conditions were determined. Aiming at the problem of yellowing of effluent color, flocculation precipitation method and sand filtration technology were used to further pre-treat the effluent after micro-electrolysis treatment to improve the treatment effect of wastewater. The results are as follows: (1) the optimum reaction conditions for the pretreatment of dye wastewater by microelectrolysis are as follows: the pH value is 1.2-1.3, the ratio of iron to carbon is 1: 1, and the dosage of iron and carbon is 45 g / L (wastewater removal rate is about 99%, COD removal rate is about 30%, and COD removal rate is about 30%.) The dye wastewater was treated by flocculation precipitation and sand filtration after pretreatment with micro-electrolysis technology. The chromaticity of effluent and the removal rate of COD can be increased to about 99.8%, and the iron removal rate of more than 99.9% in effluent can be compared with that of micro-electrolysis. The treatment of simulated dyestuff wastewater by microelectrolysis combined with flocculation precipitation and sand filtration can effectively remove the chroma and COD of the wastewater and improve the treatment effect of the wastewater.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X788

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