强氧化—混凝沉淀—生化组合处理双氧水生产废水的研究

发布时间：2018-07-03 20:04

本文选题：双氧水生产废水 + 铁炭微电解　；参考：《南昌大学》2017年硕士论文

【摘要】：双氧水生产废水具有高浓度,含有难降解重芳烃,水质水量不稳定的特点。本课题研究的废水是江西某化工公司制造双氧水而排放的综合污水,该废水主要包括工作液洗水、白土床再生过程所产生的凝液、氢化塔再生所产生的凝液和浸泡水、冲洗设备及地面等其它废水。该综合污水主要污染因子为CODcr和总P。测的废水CODcr为3775mg/L,磷酸盐22.45mg/L,pH为7左右。依据该废水特点,采用“Fe/C微电解+芬顿氧化+混凝沉淀+水解酸化+A/O”联合工艺处理废水,实验结论证明:1、综合单因素实验与正交实验,确定Fe/C微电解工艺各因子的最佳条件为:Fe/C值是1、Fe粉投加量是10g/L、反应pH值是2~3,反应时间是4小时。在这个反应条件下,废水经处理后,去除率为70.2%,CODcr降至1125mg/L。2、综合单因素试验和正交试验,确定Fenton氧化工艺各因子的最优条件为:双氧水投加量是4mL、反应pH值是4、反应时间是70分钟。在这个最优条件下,废水经处置后,去除率是57.1%,CODcr降到483mg/L。3、通过对比PAC和氢氧化钙的除磷效果,筛选出氢氧化钙作为中和剂,并投加聚丙烯酰胺助凝剂。小试实验得出最优混凝条件为:调节废水pH至11.5、投加聚丙烯酰胺助凝剂、搅拌时间20分钟、沉淀时间90分钟,此时总P去除率达99.1%,总P浓度降到0.2mg/L,满足排污要求。4、废水经以上组合工艺预处理后,随着水解酸化运行时间的加大,CODcr浓度减小,去除效率渐渐升高,运行时间达到10天以上后,系统处理效果逐渐稳定,对污水的CODcr去除效率在25%~30%之间。水解酸化后的废水CODcr约为300mg/L。5、A/O工艺对双氧水生产废水二级生化处理效果较好,停留时间最终达到48h,pH为中性,温度在20~25℃之间,CODcr去除效率是80%,总P去除效率是20%,水质达标。6、本项目工程投资估算,每t废水的直接运行处理费用是6.0元。
[Abstract]:The wastewater from hydrogen peroxide production is characterized by high concentration, difficult to degrade heavy aromatics and unstable water quality. The wastewater studied in this paper is a comprehensive wastewater produced by a chemical company in Jiangxi province. The wastewater mainly includes working liquid washing water, condensate produced by the regeneration process of clay bed, condensate produced by hydrogenation tower regeneration and immersion water. Washing equipment and other waste water such as floor. The main pollution factors were CODcr and total P. The CODcr of waste water was 3775 mg / L and the pH of phosphate 22.45 mg / L was about 7. According to the characteristics of the wastewater, the wastewater was treated by "Fe- / C micro-electrolytic Fenton oxidation coagulation precipitation hydrolytic acidification A / O" process. The optimum conditions of Fe / C microelectrolysis were determined as follows: 1% Fe / C = 10 g / L, pH = 2 g / L, reaction time 4 h. Under this condition, after treatment, the removal rate of CODcr was reduced to 1125mg / L. The optimum conditions of Fenton oxidation process were determined as follows: the dosage of hydrogen peroxide was 4 mL, the pH value was 4, and the reaction time was 70 minutes. Under this optimum condition, the removal rate of waste water after treatment is 57.1 mg / L ~ (-3). By comparing the phosphorus removal efficiency of PAC and calcium hydroxide, calcium hydroxide is selected as neutralizer and polyacrylamide coagulant is added. The optimum coagulation conditions are as follows: adjusting pH to 11.5, adding polyacrylamide coagulant, stirring time 20 minutes, sedimentation time 90 minutes. The removal rate of total P reached 99.1, and the total P concentration decreased to 0.2 mg / L, which met the requirements of sewage discharge. After pretreatment with the above combined process, the concentration of CODcr decreased with the increase of the operating time of hydrolysis acidification, and the removal efficiency gradually increased, and the operation time reached more than 10 days. The treatment efficiency of CODcr is between 25% and 30%. After hydrolysis and acidification, the CODcr of wastewater was about 300 mg / L. 5% A / O process had a good effect on the secondary biochemical treatment of wastewater from hydrogen peroxide production, and the residence time reached to 48 h and pH was neutral. The removal efficiency of CODcr is 80, the removal efficiency of total P is 20, the water quality is up to .6. the project investment is estimated that the cost of direct operation is 6.0 yuan per ton of waste water.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X78

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