臭氧联合混凝沉淀法去除浮选废水中有机磷

采用臭氧-混凝沉淀法去除广西某铅锌矿选矿厂尾矿库外排废水中的有机磷。有机磷主要来源于废水中残留的巯基磷酸盐类浮选药剂苯胺黑药（二苯胺基二硫代磷酸）和丁铵黑药（二丁基二硫代磷酸铵）。实验研究表明：废水中磷的存在形式90%以上为有机磷，钙盐、铁盐和铝盐无法通过混凝沉淀将有机磷去除。研究了臭氧氧化时有机磷转化为无机磷的规律，臭氧氧化可将大部分有机磷转化为无机磷。转化后的无机磷可通过硫酸铝和PAM混凝沉淀去除，尾矿库外排废水中总磷（TP）浓度由1.4~1.7下降至0.2~0.4 mg·L-1，明显低于《铅、锌工业污染物排放标准》（GB 25466-2010）中的≤1.0 mg·L-1的要求。

Dephosphorization of flotation wastewater containing organic phosphorus using ozone-coagulation sedimentation method

Organic phosphorus in tailings-discharged wastewater from a lead-zinc concentrator in Guangxi Province was removed by ozone and coagulation sedimentation. Organic phosphorus in this wastewater mainly comes from residual thiol phosphate flotation reagents, such as aniline aerofloat (2-aniline-2-phosphorothioate) and ammonium butyl aerofloat (ammonium dibutyl dithiophosphate). The experimental results show that greater than 90% of the phosphorus in this wastewater is organic phosphorus, which could not be removed by coagulation sedimentation of calcium salt, iron salt, and aluminum salt alone. Ozone oxidation was applied in this study, by which most of the organic phosphorus was transformed into inorganic phosphorus, and then removed by coagulation sedimentation of aluminum sulfate and PAM. The total phosphorus concentrations in the tailings-discharged wastewater dropped from (1.4 to 1.7) to (0.2 to 0.4)mg·L-1, which is significantly lower than the Lead and Zinc Industry Pollutant Discharge Standard (GB 25466-2010) of 1.0 mg·L-1 emissions.