铁碳微电解—紫外—UASB处理乙二醇废水的试验研究
发布时间：2018-10-26 20:31
【摘要】：乙二醇生产废水具有有机物浓度高,成分复杂,有一定毒性,难生物降解等特点,因此,开发针对该类废水的有效处理技术非常必要。本研究先采用铁碳微电解—紫外组合工艺对乙二醇废水进行预处理,再采用升流式厌氧污泥床(UASB)工艺做进一步处理,以达到出水要求。研究考察了不同因素对预处理及UASB反应器运行效果的影响,为该工艺处理乙二醇废水提供参考依据。首先,对乙二醇废水的预处理进行了研究,探讨了微电解氧化时间、初始浓度、紫外照射时间、照射半径的变化对COD去除率的影响,通过正交试验确定了工艺的最佳运行参数。结果表明,在铁碳微电解工段HRT=3.0 h,紫外氧化工段的紫外照射时间为3.0 h、照射半径为4.6 cm、原液稀释10倍的条件下,组合工艺的出水COD去除率可以达到70%。此外,通过正交试验得到各个因素对处理效果的影响主次顺序为:初始浓度紫外照射时间照射半径,其中对试验结果影响极为显著的因素是废水的初始浓度。在预处理的基础上完成了UASB反应器的启动,研究了UASB反应器对废水的处理效果。在UASB的启动过程中通过控制进入反应器有毒物质的浓度,向反应器中投加氢氧化钠、微量金属等方法来提高反应器碱度和微生物生长所需的微量元素,以促进反应器中微生物快速生长,缩小了UASB反应器的启动时间,进而能够完成UASB反应器的快速启动。考察UASB反应器启动后乙二醇浓度和pH值对运行效果的影响,结果表明,进水pH控制在7.5~8.5的范围内,温度在27℃~32℃之间,水力停留时间为10h,进水中乙二醇浓度为3000mg/L时,COD去除率可以达到92%,反应器达到最佳运行状态。通过铁碳微电解—紫外—UASB组合工艺处理后的乙二醇废水,有机物浓度大大降低,可满足后续的好氧生物处理要求。
[Abstract]:The wastewater from ethylene glycol production has the characteristics of high concentration of organic matter, complex composition, certain toxicity and difficult biodegradation. Therefore, it is necessary to develop an effective treatment technology for this kind of wastewater. In this study, the process of iron-carbon micro-electrolysis combined with UV was used to pre-treat ethylene glycol wastewater, and then the up-flow anaerobic sludge bed (UASB) process was used for further treatment, in order to meet the requirement of effluent. The effects of different factors on pretreatment and operation of UASB reactor were investigated in order to provide a reference for the treatment of ethylene glycol wastewater by this process. Firstly, the pretreatment of ethylene glycol wastewater was studied, and the effects of micro-electrolysis oxidation time, initial concentration, ultraviolet irradiation time and irradiation radius on the removal rate of COD were discussed. The optimum operation parameters were determined by orthogonal test. The results showed that under the conditions of HRT=3.0 h, UV oxidation stage external irradiation time 3.0 h, irradiation radius 4.6 cm, dilution 10 times, the effluent COD removal rate of the combined process could reach 70%. In addition, the effects of various factors on the treatment effect were obtained by orthogonal experiment in the order of initial concentration of ultraviolet irradiation time radiation radius, among which the most significant influence on the experimental results was the initial concentration of wastewater. On the basis of pretreatment, the start-up of UASB reactor was completed, and the effect of UASB reactor on wastewater treatment was studied. During the start-up of UASB, the alkalinity of the reactor and the trace elements needed for microbial growth can be improved by controlling the concentration of toxic substances entering the reactor and adding sodium hydroxide and trace metals into the reactor. In order to promote the rapid growth of microorganisms in the reactor, reduce the start-up time of UASB reactor, and then complete the rapid start of UASB reactor. The effects of ethylene glycol concentration and pH value on the operation effect of UASB reactor after start-up were investigated. The results showed that the influent pH was controlled in the range of 7.5 ~ 8.5, the temperature was 27 鈩，
本文编号：2296864
[Abstract]:The wastewater from ethylene glycol production has the characteristics of high concentration of organic matter, complex composition, certain toxicity and difficult biodegradation. Therefore, it is necessary to develop an effective treatment technology for this kind of wastewater. In this study, the process of iron-carbon micro-electrolysis combined with UV was used to pre-treat ethylene glycol wastewater, and then the up-flow anaerobic sludge bed (UASB) process was used for further treatment, in order to meet the requirement of effluent. The effects of different factors on pretreatment and operation of UASB reactor were investigated in order to provide a reference for the treatment of ethylene glycol wastewater by this process. Firstly, the pretreatment of ethylene glycol wastewater was studied, and the effects of micro-electrolysis oxidation time, initial concentration, ultraviolet irradiation time and irradiation radius on the removal rate of COD were discussed. The optimum operation parameters were determined by orthogonal test. The results showed that under the conditions of HRT=3.0 h, UV oxidation stage external irradiation time 3.0 h, irradiation radius 4.6 cm, dilution 10 times, the effluent COD removal rate of the combined process could reach 70%. In addition, the effects of various factors on the treatment effect were obtained by orthogonal experiment in the order of initial concentration of ultraviolet irradiation time radiation radius, among which the most significant influence on the experimental results was the initial concentration of wastewater. On the basis of pretreatment, the start-up of UASB reactor was completed, and the effect of UASB reactor on wastewater treatment was studied. During the start-up of UASB, the alkalinity of the reactor and the trace elements needed for microbial growth can be improved by controlling the concentration of toxic substances entering the reactor and adding sodium hydroxide and trace metals into the reactor. In order to promote the rapid growth of microorganisms in the reactor, reduce the start-up time of UASB reactor, and then complete the rapid start of UASB reactor. The effects of ethylene glycol concentration and pH value on the operation effect of UASB reactor after start-up were investigated. The results showed that the influent pH was controlled in the range of 7.5 ~ 8.5, the temperature was 27 鈩，
本文编号：2296864
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