甲硫醇钠生产废水高级氧化技术的研究

发布时间：2018-10-18 19:37

【摘要】：甲硫醇钠是一种的有机中间体,能够合成多种重要物质,在市场中的需求逐渐增加。甲硫醇钠有许多合成方式有,但是采取最多的生产工艺是用硫氢化钠(NaHS)和硫酸二甲酯(C2H6O4S)为原料,发生反应生成甲硫醇(CH4S),再甲硫醇被碱液吸收制成甲硫醇钠(CH3NaS)。目前在甲硫醇钠的生产过程中,由于企业生产管理或者治理方法的限制,导致企业周边水和大气环境受到污染。2016年6月山东省某企业违规生产甲硫醇钠,在没有任何处理设施的情况下违规生产,恶臭气味逸散,导致周边环境极其恶劣。因此针对此类特种废水,研制经济、有效治理甲硫醇钠生产废水的技术不仅能够使甲硫醇钠产量满足市场发展,而且能够解决甲硫醇钠废水污染问题,这具有很大的经济价值和实际意义。本论文的主要包括以下内容:(1)甲硫醇钠生产废水主要成分的分析研究;(2)不同氧化剂对甲硫醇钠废水去除COD效果的对比研究;(3)芬顿试剂对甲硫醇钠废水实验条件的优化;(4)初步探究电化学氧化技术扫描速率对模拟甲硫醇钠废水氧化还原电位的影响。采用亚甲基蓝分光光度法(GB/T16489-1996)对甲硫醇钠废水硫含量进行分析,知该废水水样中硫化物的含量为5mg/L;在碱性条件下,甲硫醇与碘发生氧化还原反应生产双硫醚,在通过碘量法测得废水水样中甲硫醇钠的含量为75.6g/L;采用重量法(HJ/T51-1999)测量溶液全盐量,废水水样经处理后处理液的盐含量为77g/L;通过对比四种不同氧化剂对该水样的COD去除效果,知芬顿试剂对甲硫醇钠废水水样的处理效果十分显著,该甲硫醇钠废水COD去除率能够达到99%,且COD值为202mg/L,满足排入城镇污水下水道二级标准,并且从最后处理液中能够回收芒硝。通过模拟甲硫醇钠水样所做的电化学进行初步探究,得知其氧化还原电位随扫描速率的增大而增大,但浓度的大小并不影响其氧化还原电位。
[Abstract]:Sodium methylmercaptate is an organic intermediate, which can synthesize many important substances, and the demand in the market is increasing gradually. Sodium methylmercaptate is synthesized in many ways, but the most widely used production process is to use sodium sulphide (NaHS) and dimethyl sulfate (C2H6O4S) as raw materials to produce methyl mercaptan (CH4S), and then methyl mercaptan is absorbed by alkali to form sodium methionol (CH3NaS). At present, in the production process of sodium methionol, the water and atmospheric environment around the enterprise is polluted due to the restriction of the production management or management methods of the enterprise. In June 2016, a certain enterprise in Shandong Province illegally produced sodium methionol. In the absence of any processing facilities, illegal production, odor emission, resulting in an extremely harsh surrounding environment. Therefore, for this kind of special wastewater, the technology of developing economical and effective treatment of sodium methionol production wastewater can not only make the production of sodium methionol meet the market development, but also solve the pollution problem of sodium methionol wastewater. This has great economic value and practical significance. The main contents of this thesis are as follows: (1) the analysis of the main components of sodium methionol wastewater; (2) the comparative study on the removal of COD from sodium methionol wastewater by different oxidants; (3) the experimental conditions of Fenton reagent for sodium methionol wastewater. (4) the effect of scanning rate of electrochemical oxidation technology on the redox potential of simulated sodium methionol wastewater was investigated. The sulfur content of sodium methionol wastewater was analyzed by methylene blue spectrophotometry (GB/T16489-1996), and the sulfides content in the wastewater was found to be 5 mg / L. In alkaline condition, methionol redox with iodine to produce disulfide. The content of sodium methylmercaptate in wastewater was 75.6 g / L by iodine method, the total salt content of solution was measured by gravimetric method (HJ/T51-1999), the salt content of treated solution was 77 g / L, and the COD removal efficiency of the water sample was compared with four different oxidants. The COD removal rate of sodium methionol wastewater can reach 99mg / L, and the COD value is 20mg / L, which meets the secondary standard of sewage discharge into urban sewage, and can recover mirabilite from the final treatment solution. By simulating the electrochemical properties of sodium methionol in water, it is found that the redox potential increases with the increase of the scanning rate, but the concentration does not affect the redox potential.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X783

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