复合酸化剂对电镀污泥中铬、铜的去除效果

以电镀加工厂产生的污水污泥作为主要研究对象,研究了柠檬酸、硝酸、过氧化氢为复合酸化剂,Fe3+为增效剂对电镀污泥中铬和铜的去除效果,考察了酸化剂的浓度、反应时间、摇床转速、污泥pH、Fe3+浓度等因素对污泥中重金属去除效率的影响。结果表明:在室温下,含0.15 mol/L柠檬酸、1.5%过氧化氢、0.25 mol/L硝酸的复合酸化剂与增效剂2.0g/L Fe3+溶液共同处理污泥,固液比为1∶10,以150 r/min的转速振荡4 h,对污泥中Cr的去除效率达到80.02%,Cu的去除效率可达到92.89%,使污泥中残留Cr、Cu含量均符合国家污泥农用标准。

Removal effects of acidulant on Cr and Cu in electroplating sludge

The removal effects of Cr and Cu from electroplating sludge were studied by using citric acid,nitric acid,hydrogen peroxide as compound acidulant and using ferric ion as synergist.The influences of compound acidulant concentration,reaction time,rotational speed,pH value and ferric ion concentration on the removal efficiency of heavy metals were investigated.The results showed that ferric nitrate was dissolved by 0.15 mol/L citric acid and 0.25 mol/L nitric acid containing 1.5% hydrogen peroxide,and the optimal mass concentration of ferric ion was 2.0 g/L.At the room temperature,keeping to sludge-liquid ratio at 1:10,the specimens were swung for 4 hours in the rotational speed at 150 r/min.And the max removal rates of Cr and Cu were about 80.02% and 92.89%,respectively.And the residual quantity of heavy metals in the sewage sludge was measured up to national standards of agricultural sludge.