Fenton预处理—铁强化厌氧反应器处理染料废水

发布时间：2018-01-11 22:37

本文关键词：Fenton预处理—铁强化厌氧反应器处理染料废水　出处：《大连理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：与物理法和化学法相比,使用生物法处理染料废水运行维护成本更低,具有更好的经济效益。在生物法中,采用厌氧微生物反应器处理染料废水,在很好的控制处理成本的同时,具有较高的环境友好性。然而高浓度有机废水对微生物的毒性,会影响废水的矿化效果。染料的生产属于典型的精细化工生产过程,生产过程中产品种类转换快,且多为复杂的化学反应过程,造成染料废水中有机物含量多且成分复杂,可生化性差,不宜直接利用生物法进行降解。利用高级氧化和厌氧消化技术相结合,可以有效去除难降解的高毒性有机污染物。零价铁已经被证明可以有效维持反应器内的厌氧环境,促进厌氧水解酸化,提高厌氧反应器对有机物的处理能力。而零价铁对高浓度染料废水的两相厌氧处理中产甲烷过程的影响,尤其是对经过Fenton预处理后的废水的厌氧处理,研究较少。因此本实验以某染料生产工厂产生的高浓度染料废水作为处理对象,通过Fenton高级氧化技术预处理与厌氧生物处理技术相结合,考察零价铁对两相厌氧反应器产甲烷段的强化作用。本论文基于以上设想展开研究,并得到了以下结论：1、利用Fenton氧化技术对高浓度有机废水进行预处理,通过采用COD:H2O2:Fe2+质量比为1：0.3：0.2,将染料废水的可生化性由0.0808提高到了0.3350,为后续的生物处理提供良好的基础。2、通过向两相厌氧反应器产甲烷段添加零价铁,考察零价铁对两相厌氧反应器产甲烷段的强化作用。与传统厌氧反应器相比,COD去除率由60%提高至87%,甲烷产量由0.17 L/h提高到了0.26 L/h,零价铁的添加对厌氧反应器具有明显的促进作用。3、零价铁作为还原剂,降低反应器内的氧化还原电位,优化厌氧微生物的生存环境。零价铁与有机酸的反应在降低反应器内H+含量的同时,可有效富集嗜氢产甲烷菌,提高H2利用率,降低H2分压,促进有机酸的分解代谢,提高对废水中有机物矿化的效果。4、零价铁在厌氧反应器反应过程中生成铁离子,铁离子作为营养物质被微生物所利用,提高了厌氧反应器污泥中的铁离子含量。同时,厌氧微生物消耗零价铁表面的氧化产物,维持了零价铁对有机污染物的还原降解能力。5、将Fe3+加入厌氧反应器中,可提高厌氧污泥中铁还原菌的活性,通过电子传递还原Fe3+的同时氧化降解有机物,提高了COD的去除效果。因此作为工业废料的铁屑可不经过去除表面铁锈的前处理,待铁屑表面的铁锈消耗完之后,即可作为零价铁继续发挥对厌氧反应器的强化作用。
[Abstract]:Compared with physical method and chemical method, biological method of dye wastewater treatment operation and maintenance cost is lower, it has better economic benefit. In the biological process, the anaerobic reactor for the treatment of dye wastewater, in good control of processing costs at the same time, environmental friendliness is higher. However, the high concentration organic wastewater on microorganisms the toxicity will affect the effect of mineralization. Dye production wastewater is a typical chemical production process, the production process products fast conversion, and more complex chemical reactions, resulting in dye wastewater organic matter content and complex composition and poor biodegradability, not directly degraded by biological method combined. The use of advanced oxidation and anaerobic digestion technology, can effectively remove the high toxicity of organic pollutants are difficult to degrade. Zero valent iron has been shown to effectively maintain the anaerobic environment inside the reactor, To promote the anaerobic hydrolysis acidification, improve the processing ability of anaerobic reactor for organic compounds. And zero valent iron in High Concentration Dye Wastewater two-phase anaerobic methanogenic process, especially after the anaerobic treatment of wastewater pretreated by Fenton research less. Therefore the high concentration of dye wastewater in this experiment, a production factory dye as the processing object, through the combination of Fenton technology of advanced oxidation pretreatment and anaerobic biological treatment technology, investigation of zero valent iron on the strengthening effect of two-phase anaerobic reactor methane production period. This thesis launches the research based on the above idea, and got the following conclusions: 1, the high concentration organic wastewater was treated by Fenton oxidation by using COD:H2O2:Fe2+ technology, the ratio of 1:0.3:0.2, the biodegradability of dyeing wastewater was increased from 0.0808 to 0.3350, to provide a good basis for the subsequent biological treatment The.2 foundation, through to the two-phase anaerobic reactor methane production period of adding zero valent iron, effects of zero valent iron on the strengthening effect of two-phase anaerobic reactor methane producing period. Compared with the traditional anaerobic reactor, the removal rate of COD increased from 60% to 87%, methane production increased from 0.17 L/h to 0.26 L/h, adding zero valent iron has a significant effect on the.3 anaerobic reactor, zero valent iron as a reductant to reduce the oxidation-reduction potential of the reactor, optimization of anaerobic microbial environment. Zero valent iron and organic acid in the reaction to reduce the content of H+ in the reactor at the same time, can effectively enrich thermophilic hydrogen and methane bacteria, improve H2 the utilization rate, reduce the partial pressure of H2, promote the decomposition of the organic acid metabolism, improve the effect of.4 on organic matter in wastewater mineralization, zero valent iron generated in the reaction of anaerobic reactor in the process of iron ions, iron ions as nutrients by microorganisms, improve the anaerobic reactor The iron content in sludge. At the same time, anaerobic microorganisms consume zero valent iron surface oxidation products, to maintain the ability of.5 zero valent iron reductive degradation of organic pollutants, add Fe3+ anaerobic reactor, anaerobic sludge can improve the iron reducing bacteria activity, through electron transfer reduction of Fe3+ and oxidative degradation of organic compounds. To improve the removal efficiency of COD. So as the industrial waste scrap iron without pretreatment to remove surface rust, iron after surface rust consumed, can be used as zero valent iron continue to play a strengthening of the anaerobic reactor used.

【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X788

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