电化学法处理垃圾渗沥液反渗透浓缩液的实验研究

发布时间：2018-09-19 16:32

【摘要】：城市垃圾在卫生填埋过程中会产生高含盐难生物降解的有机废水——垃圾渗沥液。随着垃圾渗沥液处理技术的发展,膜分离技术在一定程度上解决了垃圾渗沥液处理难题,但膜分离同时产生了一定数量的更难处理的具有超高含盐、高色度、高浓度特点的难降解废水——膜截留浓缩废液。电化学氧化法作为一种有效去除难降解有机物的高级氧化处理技术,具有环境兼容性和友好性的特点。近年来,电化学氧化法不仅引起了人们的广泛关注,而且已在垃圾渗沥液、制药废水、制革废水、印染废水、炼油废水等领域开展相关研究工作。本研究利用电化学氧化技术进行垃圾渗沥液反渗透截留浓缩液处理实验研究,处理对象取自青岛小涧西渗沥液处理有限公司MBR处理出水经DTRO系统截留的浓缩液。通过实验研究确定了适宜的电极极板材料与电解工艺统计及运行参数,具体研究内容与研究结果如下:(1)利用电絮凝和聚铁絮凝技术对浓缩液预处理实验的结果表明,利用聚铁对浓缩液进行絮凝比电絮凝更有优势,当聚铁的投加量为12.5g/L时,CODcr去除率达到52.82%。(2)电化学氧化电极材料选择实验研究结果表明,选择合适的电极材料不仅可以提高效率而且是实验成功的关键因素。电化学氧化实验结果表明,电极材料对电化学氧化处理效果影响较大,各种电极材料的电解处理效果由好到差分别为TPB电极、二氧化钌电极、二氧化铱电极、金属氧化物改性活性炭电极、氧化锡锑橡胶电极。因此,本研究选用TPB电极作为后续实验的对象。(3)利用板式电解装置对絮凝预处理后浓缩液的正交试验结果表明,各影响因素主次关系为占空比电压频率p H。其最优水平的组合方式为电压10V、频率3000Hz、占空比15%、p H=7。在最优条件下,其CODcr的去除率为76%。(4)利用同轴电解装置对浓缩液原液的单因素试验实验结果表明,在最佳工艺组合条件下(脉冲电压为15V,占空比为15%,频率为2000Hz,流量为5m3/h),电解反应历时6h时电解效果达到最佳,CODcr去除率达到82.96%。(5)同轴与板式电解装置的对比实验结果表明,同轴与板式系统相比在反应历时2h、4h、6h、8h、10h条件下,其CODcr去除率分别提高了46.2%、26.93%、14.07%、8.73%、5.60%。在达到相同的电解效果的前提下,板式系统装置需要反应历时12h,而同轴系统装置仅需要反应历时6h。因此,同轴系统装置比板式系统具有优势。(6)在电化学氧化过程中NH4+-N的去除率达到96.89%。色度的去除率达到99.00%。
[Abstract]:In the process of sanitary landfill, municipal solid waste (MSW) will produce organic wastewater with high salt content, which is difficult to biodegrade-landfill leachate. With the development of landfill leachate treatment technology, membrane separation technology has solved the problem of landfill leachate treatment to a certain extent, but membrane separation has produced a certain number of more difficult to deal with the high salt, high color, High concentration of refractory wastewater-membrane interception of concentrated waste liquid. Electrochemical oxidation, as an advanced oxidation technology for removing refractory organic compounds, has the characteristics of environmental compatibility and friendliness. In recent years, electrochemical oxidation has not only attracted widespread attention, but also has carried out related research work in the fields of leachate, pharmaceutical wastewater, tannery wastewater, printing and dyeing wastewater, refinery wastewater and so on. In this study, the treatment of landfill leachate by reverse osmosis retention concentrate was studied by electrochemical oxidation technology. The treatment object was collected from the effluent of MBR treated by DTRO system in Qingdao small Jianxi leachate treatment Co., Ltd. The suitable electrode plate material and electrolysis process statistics and operation parameters were determined through experimental research. The specific research contents and results are as follows: (1) the pretreatment experiment of concentrated liquid by electroflocculation and polyferric flocculation technology shows that; Flocculation of concentrated liquid by polyferric is more advantageous than electrocoagulation. When the dosage of polyiron is 12.5g/L, the removal rate of CODcr reaches 52.82%. (2) the experimental results of electrode material selection for electrochemical oxidation show that: (1) when the dosage of polyiron is 12.5g/L, the removal rate of CODcr can reach 52.82%. The selection of appropriate electrode materials can not only improve the efficiency but also is the key factor for the success of the experiment. The results of electrochemical oxidation experiment show that the electrode material has a great effect on the electrochemical oxidation treatment. The electrolysis treatment efficiency of various electrode materials is TPB electrode, ruthenium oxide electrode, iridium oxide electrode, etc. Metal oxide modified activated carbon electrode, tin oxide antimony rubber electrode. Therefore, the TPB electrode was selected as the object of the following experiment. (3) the orthogonal test results of the concentrated solution after flocculation pretreatment with plate electrolysis device showed that the main and secondary relationship of each factor was the duty cycle voltage frequency (pH). The optimal combination mode is voltage 10V, frequency 3000Hz, duty cycle 15pH 7. Under the optimum conditions, the removal rate of CODcr is 76%. (4) the single factor experiment results of coaxial electrolysis on the concentrated solution show that, Under the optimum process combination conditions (pulse voltage 15V, duty cycle 15, frequency 2000Hz, flow rate 5m3/h), the electrolysis effect reached the best removal rate of 82.96 when the electrolysis reaction lasted 6 h. (5) the comparison experiment results of coaxial and plate electrolysis device show that, Compared with the plate system, the removal rate of CODcr in the coaxial system was increased by 46.2and 26.93and 14.07, respectively, under the reaction duration of 2 h ~ 4 h ~ 6 h ~ (6 h) and 8 h ~ 8 h ~ (10 h). On the premise of the same electrolysis effect, the plate system needs 12 h reaction time, while the coaxial system only needs 6 h reaction time. Therefore, the coaxial system has an advantage over the plate system. (6) the removal rate of NH4-N in electrochemical oxidation process is 96.89. The removal rate of chromaticity reached 99.00.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703.1

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