电子电镀高浓度COD铜镍混合废水处理技术研究

发布时间：2018-05-21 20:20

本文选题：电子电镀 + 高COD　；参考：《南昌航空大学》2017年硕士论文

【摘要】：电子电镀行业生产过程中会产生大量既含高浓度有机物、又含重金属的混合废水。目前单一COD废水和单一重金属废水的处理研究报道比较多,但同时对含有两者的废水处理研究却较少。针对这种现状,本论文从某电子线路板企业现场调研出发,得出废水污染源主要来自铜板刷磨、化学镀铜镀镍、微蚀酸洗和退膜等工序,通过对公司进行一个月的水质监测,发现综合废水中总铜浓度范围在53.80~140.94 mg/L之间、总镍浓度在0.199~9.602 mg/L之间、COD浓度在1113.42mg/L~2490.16 mg/L之间,属于典型的高浓度COD铜镍混合废水。对此分别采用臭氧光催化法、中和沉淀法、铁碳微电解法处理该废水,考察单一工艺方法的去除效果,并得出各个工艺的最佳参数,通过实验研究表明:(1)臭氧光催化法降解废水COD时,控制条件为:pH=3、臭氧流量在70mg/min、UV紫外光照射时间在70 min、双氧水投加量为70 ml/L,结果表明废水中COD浓度从1691.87 mg/L降低至200.19 mg/L,去除率达到88.17%。(2)中和沉淀法处理有机物铜镍混合废水时,pH=9为最佳工艺参数,此时Cu2+的浓度从102.35 mg/L降低至3.38 mg/L,去除率为96.70%;Ni2+的浓度从9.24mg/L降低至0.77 mg/L,去除率为91.67%;COD的浓度从1691.87 mg/L降低至1258.23 mg/L,去除率为25.63%。(3)铁碳微电解法处理有机物铜镍混合废水时,分别设计了单因素实验和正交实验,结果表明对Cu2+去除的最佳工艺条件为:pH值为4、铁屑投加量为55g/L、铁碳质量比为1/1、反应时间为80 min,Cu2+浓度从102.35 mg/L降低至2.61mg/L,去除率为97.45%;对Ni2+去除的最佳工艺条件为:pH值为4、铁屑投加量为50 g/L、铁碳质量比为1/1、反应时间为80 min,Ni2+浓度从9.24 mg/L降低至1.03 mg/L,去除率为88.85%。可以看出臭氧光催化法对COD、中和沉淀和铁碳微电解法对铜镍离子,都有良好的去除效果,但是都无法同时使废水中COD和铜镍离子达到排放标准。因此本文最后结合各单一工艺确定的最佳处理条件,确定了“臭氧光催化/微电解中和”的组合工艺,对高浓度COD铜镍混合废水进行处理研究。最终使废水中Cu2+浓度从102.35 mg/L降至0.46 mg/L、去除率为99.55%,Ni2+浓度从9.24 mg/L降至0.39 mg/L、去除率为95.78%,COD浓度从1691.87 mg/L降至172.56 mg/L、去除率为89.80%。结果表明“臭氧光催化/微电解中和”组合工艺在最佳的实验条件下,对高浓度COD铜镍混合废水进行处理时,达到了本课题研究的目的。
[Abstract]:A large amount of mixed wastewater containing both high concentration of organic matter and heavy metal will be produced in the production process of electronic electroplating industry. At present, there are many reports on the treatment of single COD wastewater and single heavy metal wastewater, but there are few researches on the treatment of wastewater containing both of them at the same time. In view of this situation, based on the field investigation of an electronic circuit board enterprise, this paper draws the conclusion that the pollution source of wastewater mainly comes from the processes of copper brushing, electroless copper plating and nickel plating, micro-etching acid washing and film removal, etc. Through the monitoring of the water quality of the company for one month, It was found that the concentration of total copper in the wastewater ranged from 53.80 to 140.94 mg/L, and the concentration of total nickel between 0.199 and 9.602 mg/L was found to be in the range of 1113.42mg/L~2490.16 mg/L, which was a typical high concentration COD copper-nickel mixed wastewater. The wastewater was treated by ozone photocatalytic method, neutralization precipitation method and iron-carbon micro-electrolysis method respectively. The removal effect of the single process was investigated, and the optimum parameters of each process were obtained. The experimental results show that COD is degraded by ozone photocatalytic method. The results showed that the concentration of COD in wastewater decreased from 1691.87 mg/L to 200.19 mg / L, and the removal rate reached 88.17% 路L ~ (-1). The optimum technological parameters were pH 9. At this time, the concentration of Cu2 was reduced from 102.35 mg/L to 3.38 mg / L, the removal rate of 96.70% Ni2 was reduced from 9.24mg/L to 0.77 mg / L, the concentration of Cu2 was reduced from 1691.87 mg/L to 1258.23 mg / L, and the removal rate was 25.63%. Single factor experiment and orthogonal experiment were designed respectively. The results show that the optimum process conditions for Cu2 removal are as follows: the pH value is 4, the iron chip dosage is 55g / L, the iron-carbon mass ratio is 1 / 1, the reaction time is 80 mg/L and the concentration of Cu2 is reduced from 102.35 mg/L to 2.61 mg / L, and the removal rate is 97.45%. 4, the amount of iron scraps is 50 g / L, the ratio of iron to carbon is 1 / 1, and the reaction time is 80 mg/L. The concentration of Ni2 is reduced from 9.24 mg/L to 1.03 mg / L, and the removal rate is 88.85. It can be seen that the ozone photocatalytic method has a good effect on the removal of copper-nickel ions from COD, neutralization precipitation and iron-carbon micro-electrolysis, but neither of them can make the COD and Cu-Ni ions in the wastewater meet the discharge standard at the same time. Therefore, the combined process of "ozone photocatalysis / micro-electrolysis neutralization" was determined according to the optimal treatment conditions determined by each single process, and the treatment of high concentration COD copper-nickel mixed wastewater was studied. Finally, the Cu2 concentration in the wastewater was reduced from 102.35 mg/L to 0.46 mg / L, the removal rate was 99.55% from 9.24 mg/L to 0.39 mg / L, the removal rate was 95.78% from 1691.87 mg/L to 172.56 mg / L, and the removal rate was 89.80%. The results show that the combined process of "ozone photocatalysis / micro electrolysis neutralization" can achieve the purpose of this research when the mixed wastewater of high concentration COD copper and nickel is treated under the optimum experimental conditions.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X781.1

【相似文献】