组合物化工艺处理高含盐采气废水研究

发布时间：2018-03-01 05:01

本文关键词： 采气废水酸析 Fenton 吸附　出处：《西南科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：高含盐采气废水具有水质成分复杂、油类物质含量高、矿化度高、COD含量高、氯离子浓度高、难以生化等特点。生物法或单一物化法无法将其处理后达标排放,该类废水的治理已成为安全处置各类工业废水中的难题。本课题采取多种方法联用的方式,组成新的处理工艺,并通过试验探寻处理高含盐采气废水的最优组合工艺,具有现实的研究意义和潜在的应用价值。本试验选用酸析-Fenton-活性炭吸附组合工艺处理川西某气井采气废水,通过实验探讨处理该废水的可行性、污染指标相应变化及各个因素对处理效果的影响,最终确定组合工艺的最佳反应条件。首先,在分析采气废水各项水质指标的基础上进行酸析实验。在p H值为1时,SS、油类物质、色度、COD去除率可分别达到91%、30%、32%和27%,油水分离效果较好。然后,以Fenton氧化法处理酸析后的废水,开展对废水COD去除的影响因素分析,以正交试验确定Fenton法的最佳处理条件。数据表明Fenton法处理废水的最佳操作条件为:H2O2/COD为7,H2O2/Fe2+(摩尔比)为3,p H值为1,反应时间为120min;此时COD、SS、油类物质、色度的去除率可分别达到64%、97%、89%、93%,处理效果显著。最后,对经Fenton氧化处理后的废水,采用活性炭进行吸附处理。吸附试验考查了吸附材料的不同投加量以及吸附时间对废水COD去除率的影响。结果表明,常温下按20g/L投加活性炭,反应11h后,出水COD去除率可达57%,处理后出水澄清透明。从经济技术及实际应用出发,考虑将Fenton试剂及吸附材料分批次投加,优化物化组合工艺,COD去除率显著增大。由此可得分批投加药剂会进一步提高反应效果。在组合工艺最佳处理条件下,CODcr值低于100mg/L,处理后出水指标达到国家《污水综合排放标准》(GB8978-1996)一级标准。经估算,该组合工艺处理采气废水外排达标的运行成本费用累计为19.64~34.88元/m3。综上所述,酸析-Fenton氧化-活性炭吸附工艺在技术和经济上是行之有效的,具有良好的应用价值和推广前景。
[Abstract]:The wastewater with high salt content is characterized by complex water quality, high oil content, high salinity, high COD content, high chloride ion concentration, difficult biochemistry and so on. The treatment of this kind of wastewater has become a difficult problem in the safe disposal of all kinds of industrial wastewater. In this paper, a new treatment process is formed by using a variety of methods, and the optimal combination process for the treatment of high salt gas recovery wastewater is explored through experiments. It is of practical significance and potential application value. In this experiment, a combination of acidation-Fenton-activated carbon adsorption process was used to treat gas recovery wastewater from a gas well in western Sichuan, and the feasibility of treating the wastewater was discussed through experiments. The corresponding change of pollution index and the influence of various factors on the treatment effect, finally determine the best reaction conditions of the combined process. First of all, On the basis of analyzing the water quality index of gas recovery wastewater, the acid analysis experiment was carried out. When pH value was 1:00 / SS, the removal rate of oil substance and chromaticity Fenton could reach 91% and 27% respectively. The separation effect of oil and water was better. Then, the wastewater after acid analysis was treated by Fenton oxidation method. Carry out the analysis of influencing factors on COD removal of wastewater, The optimum treatment conditions of Fenton method were determined by orthogonal test. The data show that the optimal operating conditions of Fenton process for wastewater treatment are as follows: the COD of Fenton is 7H _ 2O _ 2 / Fe _ 2 (molar ratio) is 3 / H _ H = 1 and the reaction time is 120 min, and the COD _ (2) / H _ (2) / Fe _ (2) is 120 min. The removal rate of chromaticity can reach 64 / 97 / 993, respectively, and the treatment effect is remarkable. Finally, the wastewater treated by Fenton oxidation, The effects of different dosage of adsorbed materials and adsorption time on the removal rate of COD in wastewater were investigated. The results showed that the activated carbon was added at 20 g / L at room temperature for 11 h. The removal rate of COD in effluent can reach 57%, and the effluent is clear and transparent after treatment. From the point of view of economic, technical and practical application, the batch addition of Fenton reagent and adsorption material is considered. The COD removal rate of the optimized physico-chemical combination process increased significantly, and the reaction effect could be further improved by adding chemicals in batches. Under the optimum treatment conditions, the CODcr value was lower than 100 mg / L, and the effluent after treatment reached the national wastewater synthesis. Combined emission standard (GB 8978-1996). The total operating cost of the combined process is 19.64 ~ 34.88 yuan / m ~ (3). To sum up, the acidation-Fenton oxidation-activated carbon adsorption process is effective in technology and economy, and has good application value and popularizing prospect.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X741

【参考文献】