臭氧生物活性炭工艺处理某多金属硫化矿浮选废水的小试研究

某多金属硫化矿选矿厂浮选废水水量大,目前该厂对浮选废水的处理方法为尾矿库砂滤治理,但该方法存在效率低、周期长、回用影响选矿指标等众多弊端。为高效低成本的处理浮选废水,结合浮选废水的特点(低COD、难降解、高pH),开展了臭氧氧化-生物活性炭吸附工艺处理选矿废水的小试研究。选矿废水中各残留有机药剂及pH对浮选指标的影响研究表明,废水中残留有机药剂及pH对浮选指标均有不同程度的影响。臭氧氧化-生活活性炭吸附工艺处理选矿废水的小试研究表明,水力停留时间为4 h、反应器臭氧浓度为33.3 mg/L,可获得COD去除率57%、pH降低到8的废水处理效果。将处理后的废水回用于选矿,基本消除残留药剂及pH对浮选指标的影响。本研究提供了一种处理浮选废水的新思路,对臭氧生物活性炭工艺处理浮选废水的工业应用具备参考价值。

Lab scale ozone-biological activated carbon reactor treatment of flotation wastewater from a nonferrous poly-metal ore mine

The quantity of wastewater from a multi-metal sulfide ore mineral processing process is large. Current treatment of the wastewater is by the sand filter of tailing pond. Such treatment is low efficiency, long HRT and has adverse impact on the flotation process. In this study, a lab scale ozone-biological activated carbon (BAC) reactor was used to treat flotation wastewater. Results showed that pH and residual organic regent were the key factors which affected the floation when such wastewater was directly reused. After treating by ozone-BAC reactor at hydraulic retention time of 4 h, ozone concentration of 33.3 mg/L, the COD removal increased to 57% and pH reduced to 8. Then the treated wastewater was reused on flotation, the results show that it has the same effect as fresh water. This study provides a novel method for treating flotation wastewater, meanwhile it may have referential value for industrial applications of such technology.