烧结、球团企业含铊脱硫废水处理技术研究

Study on Treatment Technology of Thallium-containing Desulfurization Waste Water in Sintering and Pelletizing Enterprises

通过开展对含铊脱硫废水处理技术的研究,提出了“氧化+化学沉淀+混凝沉淀、重金属捕收剂”这一工艺技术。通过调整次氯酸钠氧化剂、pH、聚合氯化铝(PAC)、重金属捕收剂及聚丙烯酰胺(PAM)的浓度(设定值),确定满足铊去除要求的最佳配比。试验结果表明,当次氯酸钠氧化剂、PAC、重金属捕收剂及PAM浓度分别为1 500 mg/L、200 mg/L、1 300 mg/L、4 mg/L及pH值为10时,铊的去除率为99.75%,可以满足脱硫废水中铊的排放标准要求。

The process technology of “oxidation+chemical precipitation+coagulating sedimentation and heavy metal collector” is proposed through studying the treatment technology of thallium-containing desulfurization waste water as well as the optimal proportion meeting the requirements of removing thallium is determined by adjusting the concentration(set value) of oxidant(sodium hypochlorite), pH, polyaluminum chloride(PAC), heavy metal collector and polyacrylamide(PAM). The experimental results showed that the removal efficiency of thallium was 99.75% when the concentrations of oxidant(sodium hypochlorite), PAC, heavy metal collector and PAM were 1 500 mg/L, 200 mg/L, 1 300 mg/L, 4 mg/L respectively and pH value was 10, which could meet the requirements of discharge standard for thallium in desulfurization waste water.