臭氧氧化二级出水回用于选矿浮选的适用性  

Feasibility of ozonation advanced treatment of secondary effluent for water reuse in flotation unit of mineral processing plants

作　　者：窦培谦 孙春宝[2] 张达鑫[3] 王毅力[3] DOU Peiqian;SUN Chunbao;ZHANG Daxin;WANG Yili(College of Safety Engineering,China University of Labor Relations,Beijing 100048,China;College of Civil and Resource Engineering,University of Science&Technology Beijing,Beijing 100083,China;College of Environmental Science and Engineering,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]中国劳动关系学院安全工程学院,北京100048 [2]北京科技大学土木与资源工程学院,北京100083 [3]北京林业大学环境科学与工程学院,北京100083

出　　处：《环境工程学报》2022年第6期1845-1852,共8页Chinese Journal of Environmental Engineering

基　　金：教育部第二批新工科研究与实践项目“新工科产教融合、校企合作机制模式探索与实践”(E-XTYR20200607);国家“十二五”水体污染控制与治理科技重大专项子课题(2012ZX07105-002-03);国家重点研发计划项目(2017YFC0505303)。

摘　　要：为优化干旱矿区浮选单元的取水结构,降低市政污水处理厂二级出水的回用风险,以内蒙古某铜钼矿为代表性研究对象,采用臭氧氧化工艺对该区域市政污水处理厂二级出水进行深度处理,探讨其对水中病原微生物的去除效果,研究处理后的二级出水对浮选指标的影响以及相应的健康风险,评估氧化处理工艺的二级出水回用于选矿浮选单元的适用性。结果表明,二级出水中大肠杆菌浓度具有明显的季节分布性,最高浓度可达3.85×10^(6)个·mL^(-1),轮状病毒检出率为77.78%,直接回用具有一定风险;而且浮选用水的水质对浮选指标影响较大,随着COD、悬浮物浓度的下降,精矿中铜、钼的品位和回收率相应增加,浮选指标得到改善;采用臭氧氧化处理工艺二级出水,在臭氧投加量为6 mg·L^(-1)、氧化时间为10 min、不调节pH的情况下,二级出水中粪大肠杆菌衰减率可达3.44lg个·L^(-1)。在该工艺条件下,使用处理后的二级出水进行浮选,浮选产品指标合格,且粪大肠杆菌单次暴露感染风险为4.71×10^(-8)~1.35×10^(-6),年暴露感染风险为1.59×10^(-6)~4.70×10^(-4),均为可接受水平。In order to optimize the water supply structure of flotation unit in mineral processing plant of arid area and decrease the recycle risk of secondary effluent in wastewater treatment plant(WWTP),a coppermolybdenum mine located in Inner Mongolia was taken as the representative case,ozonation oxidation was employed to perform the advanced treatment of secondary effluent from a WWTP in this region.Then the removal efficiency of pathogenic microorganisms in secondary effluent was determined,the influence of treated secondary effluent on the flotation indices and the corresponding health risk were studied,the feasibility of these treated secondary effluent for water reuse in flotation unit of mineral processing plants was also evaluated.The results showed that the Fecal coliform concentration in secondary effluent had an obvious seasonal distribution characteristic with the highest concentration of 3.85×10^(6)mL^(-1),the detection rate of rotavirus was 77.78%,these indicated that direct reuse of secondary effluent had a potential risk.Moreover,the water quality for floatation had a significant effect the flotation indices.With the decrease of COD and suspended solids in water,the grade and recovery of copper and molybdenum in the concentrate increased,and the flotation indices were improved.When ozonation oxidation was used to treat secondary effluent,the attenuation rate of Fecal coliform could reach 3.44log·L^(-1) at ozone dosage of 6 mg·L^(-1),oxidation time of 10 min and non-adjusted pH.Under these conditions,the treated secondary effluent could meet the flotation water quality requirements and the qualified flotation products were achieved.Moreover,the single and the annual exposure risk of Fecal coliform were4.71×10^(-8)~1.35×10^(-6) and 1.59×10^(-6)~4.70×10^(-4),respectively,which were both at an acceptable level.

关 键 词：干旱矿区 臭氧氧化 浮选 病原微生物 

分 类 号：X52[环境科学与工程—环境工程]