絮凝-电解法处理镀镍废水

Treatment of nickel electroplating wastewater by flocculation-electrolysis method

采用复合絮凝及电解的方法研究了镀镍废水的处理。经过滤的废水(含Ni2+826.8mg/L)先以NaOH溶液调节pH至9.0自然沉淀,接着在pH=8.7下加入KAl(SO4)2·12H2O 0.133g/L、聚合硫酸铁(PFS)0.167g/L和阳离子聚丙烯酰胺(CPAM)0.167g/L进行絮凝,然后在槽电压4.5V下电解4h。处理后的废水中Ni2+含量为0.376mg/L,达到排放要求。

The treatment of nickel electroplating wastewater was studied by composite flocculation and electrolysis processes. The previously filtered wastewater containing 826.8 mg/L Ni2＋ was treated by the following steps： （1） precipitation by adjusting pH to 9.0 with NaOH solution; （2） flocculation with KAl（SO4）2.12H2O 0.133 g/L, polyferric sulfate （PFS） 0.167 g/L, and cationic polyacrylamide （CPAM） 0.167 g/L at pH 8.7; and （3） electrolysis at a cell voltage of 4.5 V for 4 h. The treated wastewater contained 0.376 mg/L Ni2＋, meeting the emission standard.