摘要
研究了硫化钠和重金属捕集剂(DTC)联合对酸性含铬废水中铬的去除效果,选定了最佳操作参数,并在此基础上利用响应曲面法,以总铬去除率为响应指标,对处理工艺参数进行优化。结果表明,在第1阶段,初始pH为2.5,硫化钠质量浓度为2.18 g/L,反应75 min;第2阶段,初始pH为3.0,捕集剂体积分数为0.004 m L/L,反应75 min时,Cr(Ⅵ)和总铬去除率分别达到100%和93.19%;通过优化实验拟合的二次回归模型可以较真实地反映条件参数对总铬去除率的影响。
The coordination effect of sodium sulfide and heavy metal composite trapping agent（ DTC） on the treatment of chromium-containing acidic wastewater has been studied and the optimal operation parameters are settled.Furthermore,response surface methodology has been applied to optimize process parameters of wastewater treatment with the removal rate of total chromium as a response index. The results show that pH is 2. 5,dosage of sodium sulfide is2. 18 g/L,reaction time is 75 min in the first stage,and pH is 3. 0,dosage of heavy metal composite trapping agent is0. 004 m L/L,reaction time is 75 min in the second stage,finally the removal ratio of Cr（ Ⅵ） and total chromium can reach 100% and 93. 19% respectively. The quadratic regression model fit by optimal experiments can reflect really the influence of condition parameters on the removal ratio of total chromium.
出处
《现代化工》
CAS
CSCD
北大核心
2017年第5期106-110,共5页
Modern Chemical Industry
基金
河南省科技攻关项目(162102310402)
郑州市科技攻关项目(20150237)
河南工程学院博士基金(D2015008)
关键词
铬
工业废水
复合硫化法
响应曲面法
chromium
industrial wastewater
composite sulfuration process
response surface methodology
