含交联胍胶有机废水深度氧化处理研究

发布时间：2018-02-11 02:15

  本文关键词： 交联胍胶废水 铁碳微电解 Fenton氧化 絮凝沉淀 预处理　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：交联胍胶有机废水是油田开发过程中产生的一种工业废水。废水中含有大量的溶解性有机物、固体悬浮物、带电胶粒、重金属、各种无机盐以及化学添加剂等,造成其成分复杂、COD含量高、色度高、毒害大、难降解等特点。如果不经过处理直接外排,将会对周围的水体环境乃至人类健康造成很大的危害。因此,有机废水处理是工业废水处理中亟待解决的一大难题。本实验中以化学需氧量(COD)的变化为分析指标,研究了铁炭微电解法和Fenton试剂氧化法的原理、特点、影响因素以及在废水处理中的应用,并通过单因素影响试验,确定最佳的运行参数,运用正交试验确定各影响因素的重要程度;进行了提出适合有机物降解的微电解-Fenton氧化-絮凝沉淀组合工艺法。试验结果表明:铁碳微电解技术的最佳操作条件为:连续通入氧的情况下原污水稀释2倍,进水pH为3,Fe/C质量比2:3,Fe-C总加量为50 g/L,反应时间为100 min,铁碳微电解对废水COD的去除率可达到54.8%左右,正交实验结果表明,各因素对实验结果的影响主次顺序为:铁碳投加量铁碳质量比反应时间pH值,铁碳微电解工艺对该瓜胶废水有良好的处理效果;本研究选取30%双氧水和硫酸亚铁作为Fenton试剂配制材料,通过单因素和正交实验,确定了Fenton法处理瓜胶废水的最佳操作条件为Fenton氧化最佳组合条件为pH为4,H2O2/Fe2+摩尔比为25,H2O2加量为12 ml/L且分三次加入,反应时间为80 min,COD的去除率在47.4%以上,正交实验结果表明,各因素对实验结果的影响主次顺序为:pH值H2O2加量H2O2/Fe2+摩尔比反应时间;絮凝沉淀过程过考察了实验考察了CPAM加量、搅拌速率、搅拌时间、反应温度、pH值等因素对污水COD降解的影响,最终处理后污水COD由1440 mg/L降到238 mg/L,总去除率达到83.7%。最后,实验在得出的最佳处理条件下对不同组合处理工艺路线进行对比,对实验处理前后污水进行显微镜观察和紫外-可见光吸收光谱对比分析,发现有机物已被很好的降解除去,水样特征吸收峰发生蓝移,在近紫外区200 nm处一直存在一个较低的肩峰,表明溶解性大分子有机物分子结构被破坏降解成无机物和一些小分子有机物,得出了微电解-Fenton氧化-絮凝沉淀组合能有效改善交联胍胶污水水质。
[Abstract]:The organic wastewater of crosslinked guanidine gum is a kind of industrial wastewater produced in the course of oilfield development. The wastewater contains a large amount of dissolved organic matter, solid suspended matter, charged colloid, heavy metal, various inorganic salts and chemical additives, etc. It has the characteristics of high COD content, high chromaticity, high toxicity, difficult to degrade and so on. If it is not treated directly, it will cause great harm to the surrounding water environment and even human health. Organic wastewater treatment is a difficult problem to be solved urgently in industrial wastewater treatment. The principle and characteristics of iron and carbon microelectrolysis and Fenton reagent oxidation are studied in this experiment with the change of chemical oxygen demand (COD) as the analysis index. Influence factors and their application in wastewater treatment, and through the single factor influence test, determine the best operating parameters, use orthogonal test to determine the importance of each factor; The combined process of micro-electrolysis Fenton oxidation and flocculation precipitation suitable for organic degradation was put forward. The experimental results showed that the optimum operating conditions of iron-carbon microelectrolysis were as follows: the original wastewater was diluted twice under continuous oxygen supply. When the influent pH is 3% Fe / C ratio of 2: 3% Fe-C is 50 g / L, the reaction time is 100 min, the removal rate of COD in wastewater by iron and carbon microelectrolysis can reach about 54.8%. The results of orthogonal experiment show that, The influence of various factors on the experimental results was in the following order: the weight of iron and carbon was higher than the pH value of reaction time, and the process of iron and carbon microelectrolysis had a good effect on the treatment of the melon gum wastewater; In this study, 30% hydrogen peroxide and ferrous sulfate were selected as Fenton reagents to prepare the materials. The optimum operating conditions for the treatment of melon gum wastewater by Fenton process were determined as follows: the optimal combination condition of Fenton oxidation was pH 4 / H _ 2O _ 2 / Fe _ 2 = 25% H _ 2O _ 2 = 12 ml/L, and the reaction time was 80 min. The removal rate of Fenton was more than 47.4%. The influence of various factors on the experimental results was in the following order: the molar ratio of H _ 2O _ 2 to H _ 2O _ 2 and H _ 2O _ 2 / Fe _ 2 molar ratio of H _ 2O _ 2 to H _ 2O _ 2.The flocculation and precipitation process was carried out and the addition of CPAM, stirring rate and stirring time were investigated. The effect of reaction temperature, pH and other factors on the degradation of COD in wastewater. After the final treatment, the COD of wastewater was reduced from 1 440 mg/L to 238 mg / L, and the total removal rate reached 83.7%. Finally, under the optimum treatment conditions, the different combined treatment process routes were compared. The microscopical observation and UV-Vis absorption spectra of sewage before and after treatment showed that organic compounds had been well degraded and the absorption peaks of water samples were blue shifted. There has been a lower acromial at 200 nm near ultraviolet, indicating that the molecular structure of dissolved macromolecular organic compounds is destroyed and degraded into inorganic compounds and some small molecular organic compounds. It is concluded that the combination of microelectrolysis-Fenton oxidation and flocculation precipitation can effectively improve the water quality of crosslinked guanidine gel wastewater.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X741
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本文编号：1501983