次氯酸钙处理EDTA-Ni络合废水  

Treatment of EDTA-Ni Wastewater by Calcium Hypochlorite

作　　者：谭侃 何龙 李姗婷 肖勇俊 张艳华 Tan Kan;He Long;Li Shanting;Xiao Yongjun;Zhang Yanhua(Dongjiang Environmental Co.,Ltd.,Shenzhen 518000,China)

机构地区：[1]东江环保股份有限公司,广东深圳518000

出　　处：《广东化工》2021年第13期117-118,共2页Guangdong Chemical Industry

基　　金：广东省省级科技计划项目(2018B030323016)。

摘　　要：采用次氯酸钙氧化处理EDTA-Ni络合废水,氧化破络后再用氢氧化钙沉镍。重点研究了氧化阶段的初始p H、反应温度、次氯酸钙用量、反应时间对出水总有机碳(TOC)和镍的影响。结果表明,次氯酸钙氧化处理EDTA-Ni络合废水优选工艺条件为:氧化初始p H=7、氧化反应温度30℃、次氯酸钙用量40 g/L、氧化反应时间210 min。在优化工艺条件下,出水镍为0.03 mg/L,满足《电镀污染物排放标准》(GB21900-2008)表3要求,出水TOC为35.6 mg/L,去除率为95.11%。EDTA-Ni wastewater was oxidized by calcium hypochlorite, and then Ni was removed by precipitation with calcium hydroxide. The effects of initial oxidation p H, oxidation temperature, calcium hypochlorite dosage and oxidation time on TOC and Ni concentration in the effluent were studied respectively. The results showed that the optimal reaction conditions for oxidization were initial oxidation at p H=7, oxidation temperature of 30 ℃, calcium hypochlorite dosage of 40 g/L and oxidation time of 90 min. Under optimized conditions, the concentration of Ni in the effluent was 0.03 mg/L, which met the requirement of the Emission Standard of Pollutants for Electroplating(GB 21900-2008), the concentration and removal rate of TOC were 35.6 mg/L and 95.11 %, respectively.

关 键 词：次氯酸钙 镍 EDTA 氧化 破络 

分 类 号：TQ[化学工程]