甘油洗涤废水的净化处理研究

发布时间：2018-03-01 10:24

  本文关键词： 甘油 电芬顿 活性污泥法 芬顿 COD 废水　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：甘油洗涤废水是电缆套生产过程中产生的污水,其具有有机物浓度高、可生化性差、无机离子浓度低的特点,污水中含有醛、酮、缩醛、缩酮以及聚合物,直接排放会危害水生生物、污染环境。目前针对这类污废水的处理技术比较少见,同时国家对企业污废水的排放标准提高,企业需要对污废水进行更有效的处理,因此探寻对甘油洗涤废水有效的处理方法具有现实意义。工业甘油在各行业有广泛的应用。为了探寻一种合适的甘油洗涤废水处理方法,本次研究以某电缆套制造企业在生产过程中产生的实际甘油洗涤废水为实验材料,采用芬顿试剂法以及电芬顿法对废水进行预处理,以提高废水可生化性,确定两种方法对废水的处理效果以及最佳操作条件。然后对预处理废水进行活性污泥法处理。本次研究得出,芬顿试剂法最佳操作条件为废水初始p H=3,硫酸亚铁投加量2.0 g/L,30%过氧化氢投加量为4.0 ml/L,反应时间2 h,废水的COD去除率约为33%;电芬顿法最佳操作条件为在无搅拌的操作条件下,p H=4,2.0 g/L硫酸钠,0.50 g/L Fe SO4·7H2O,恒定电流0.03 A,COD去除率约为55%。两种方法相比,电芬顿法对废水的COD去除效果更好。对处理过的废水可生化性进行测定,电芬顿处理的废水可生化性明显提高,这有利于对废水进行生物法处理。活性污泥法进一步处理电芬顿出水,在污泥质量浓度4000 mg/L左右,溶解氧为6 mg/L左右时,水温11℃左右,反应时间24 h的条件下,逐步提高进水COD浓度,活性污泥法运行稳定,处理效果较好。在进水COD浓度为1000 mg/L左右时,出水COD浓度低于50 mg/L;在进水COD浓度为1800 mg/L左右时,出水COD浓度约为120 mg/L,在进水COD浓度为4000 mg/L左右时,出水COD浓度约为270 mg/L,达到《污水综合排放标准》(GB8978-1996)的三级排放标准,可以排入城市管网。本次研究针对甘油洗涤废水进行初步处理方法探讨,使用的电芬顿法-活性污泥法联合工艺处理有一定的效果。
[Abstract]:Glycerol washing wastewater is a kind of wastewater produced in the process of cable sleeve production. It has the characteristics of high concentration of organic matter, poor biodegradability and low concentration of inorganic ions. The wastewater contains aldehydes, ketals, acetals, ketals and polymers. Direct discharge will harm aquatic organisms and pollute the environment. At present, the treatment technology for this kind of wastewater is relatively rare. At the same time, the state standards for discharge of wastewater from enterprises have been raised, so enterprises need to deal with wastewater more effectively. Therefore, it is of practical significance to explore an effective treatment method for glycerol washing wastewater. Industrial glycerol is widely used in various industries. In order to find a suitable treatment method for glycerin washing wastewater, In this study, the actual glycerol washing wastewater produced in a cable sleeve manufacturing enterprise was used as the experimental material, and the wastewater was pretreated by Fenton reagent method and electric Fenton method in order to improve the biodegradability of the wastewater. Determine the two methods of wastewater treatment and the best operating conditions. Then the pretreatment of wastewater treatment by activated sludge process. The optimal operating conditions of Fenton reagent method were as follows: initial pH _ 3 of wastewater, dosage of ferrous sulfate 2.0 g / L ~ (30%) hydrogen peroxide 4.0 ml 路L ~ (-1), reaction time 2 h, COD removal rate of wastewater about 33%, and operation without stirring was the best operation condition of electric Fenton method. Under this condition, the removal rate of 0.50 g / L Fe SO4 路7H _ 2O with constant current of 0.03 Ag 路7H _ 2O was about 55%. The biodegradability of treated wastewater was determined and the biodegradability of wastewater treated by electric Fenton method was improved obviously. This is beneficial to the biological treatment of wastewater. The activated sludge process is used to further treat the electric Fenton effluent. When the sludge concentration is about 4 000 mg/L, the dissolved oxygen is about 6 mg/L, the water temperature is about 11 鈩，

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