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采用重金属捕集剂三巯三嗪三钠(TMT)深度处理低含量矿山废水中Cu2+、Zn2+、Pb2+、Cd2+、Cr3+等多种混合重金属离子,研究了pH、添加量、搅拌时间、反应时间、温度以及絮凝剂等因素对处理效果的影响。结果表明,调节废水pH为7左右,投加0.4 mL质量分数为10%的TMT溶液,室温下搅拌5 min再添加适量联合絮凝剂,总反应20 min后,各重金属离子去除率均达到98%以上,出水中所考察的重金属离子含量均远低于GB 8978-1996排放要求,捕集产物稳定性高,二次污染风险小。因此,TMT在深度处理低浓度多金属离子共存的矿山废水领域具有较好的应用前景。
A series of mixed heavy metal ions such as Cu2 +, Zn2 +, Pb2 +, Cd2 + and Cr3 + in mine wastewater with low content were deeply treated with the heavy metal trapping agent trityltriazine trisodium (TMT). The effects of pH, addition amount, stirring time, reaction time, Temperature and flocculant and other factors on the treatment effect. The results showed that when the pH value of wastewater was adjusted to about 7, 0.4 mL of TMT solution with 10% mass fraction was added and stirred for 5 min at room temperature, and then the appropriate amount of flocculant was added. After 20 min of total reaction, the removal rates of heavy metal ions reached 98% , The content of heavy metal ions in the effluent was much lower than the emission requirements of GB 8978-1996, the stability of the captured product was high, and the risk of secondary pollution was small. Therefore, TMT has a good application prospect in the field of mine wastewater that coexists with low concentration of multi-metal ions in depth.