电催化氧化法去除黄金冶炼废水中氰化物和氨氮试验研究

对黄金冶炼废水进行了电催化氧化处理研究,考察了氯离子质量浓度、极板间距、电流密度等因素对氰化物和氨氮去除效果的影响。最佳工艺参数为:废水初始pH值9.28、氯离子初始质量浓度25 g/L、极板间距20 mm、电流密度16.3 mA/cm2、废水循环流速64 mL/min。在最佳工艺条件下,电解150 min,氰化物质量浓度从28.84 mg/L降至0.20 mg/L,氨氮质量浓度从700 mg/L降至7 mg/L,去除率分别为99.3%、99.0%,处理后废水中的总氰、氨氮均可达到《GB 8978—1996污水综合排放标准》一级标准。

Experimental research on removing cyanide and ammonia nitrogen from industrial waste water produced by gold smelting with electro-catalytic oxidation process

Research started with treating industrial waste water produced by gold smelting with electro-catalytic oxidation process, during which the influences of chloride ion mass concentration, plate clearance and current density on the removal of cyanide and ammonia nitrogen were analyzed. The result shows the optimal conditions for removing cyanide and ammonia nitrogen with electro-catalytic oxidation process are like this： the initial pH of waste water 9.28, initial chloride ion concentration 25 g/L ,plate clearance 20 mm, current density 16.3 mA/cm2, and waste water circulation velocity 64 mL/min. With the above conditions and electrolysis time 150 min, the cyanide concentration de- creases from 28.84 mg/L to 0.20 rag/L, and ammonia nitrogen from 700 mg/L to 7 mg/L. The removal rate is respec- tively 99.3 % and 99.0 %. The cyanide and ammonia nitrogen concentration remained in the treated water has reached of Grade 1 requirements of Integrated waste water discharge standard （ GB 8978 - 1996）. The power consump- tion per ton water is 13.1 kw · h.