臭氧氧化—生化法处理凡口铅锌矿废水及其循环利用  

Ozone Oxidation-biochemical Method Combined Treatment of Fankou Lead-zinc Mine Wastewater and Recycling

作　　者：刘威 王俊 段连鑫 蒋少军 LIU Wei;WANG Jun;DUAN Lianxin;JIANG Shaojun(Fankou Lead Zinc Mine of Shenzhen Zhongjin Lingnan nonferrous Co., Ltd., Shaoguan 512300, Guangdong, China;School of environment, South China Normal University, Guangzhou 510006, Guangdong, China)

机构地区：[1]深圳市中金岭南有色股份有限公司凡口铅锌矿,广东韶关512300 [2]华南师范大学环境学院,广东广州510006

出　　处：《矿产保护与利用》2021年第4期28-34,共7页Conservation and Utilization of Mineral Resources

基　　金：广东省科技计划项目(2018SG00118);广东省科技计划(2015B020237003)。

摘　　要：基于凡口铅锌矿选矿废水特性的解析及技改需要,以“初期氧化+预处理+生化处理法”工艺处理选矿废水。通过研究不同O_(3)浓度、催化氧化时间和不同水力停留时间(HRT)对废水处理效果的影响,考察处理后废水回用对选矿指标的影响,评估该工艺的可行性。结果表明,初期氧化阶段,利用O_(3)直接或间接氧化废水中残留药剂;协同预处理去除废水中Ca^(2+)和重金属;后续的生化处理进一步提升出水质量。在O_(3)浓度为60 mg/L,催化氧化时间为20 min,水力停留时间为16.71 h,能够将废水COD浓度降至为34.32 mg/L,去除率为91.9%;HRT和O_(3)浓度的增加对废水处理效果显著;将处理后废水回用于选矿工艺,与清水的选矿指标接近。该工艺在运行稳定下不仅能够实现选矿废水高效处理和回用,处理成本较低为2.65元/m^(3),该工艺可为国内类似铅锌选厂废水的处理及回用提供借鉴。This study was analyzing the beneficiation wastewater of Fankou lead-zinc mine and meeting the technical upgrade requirements,the research on the treatment of wastewater with the technology of"initial oxidation+pretreatment+biochemical treatment"was carried out to explore the wastewater with different ozone,catalytic oxidation time and different hydraulic retention time.Moreover,the influence of wastewater reuse after treatment on mineral processing index was investigated,and the feasibility of the process was evaluated.The results show that O_(3) was used to directly or indirectly oxidize the residual organic chemicals in the wastewater in the initial oxidation,;the co-pretreatment removes Ca^(2+) and heavy metals in the wastewater;the subsequent biochemical treatment further improves the quality of the water.In addition,the ozone concentration is 60 mg/L,the catalytic oxidation time is 20 min,and the hydraulic retention time is 16.71 h,which can reduce the wastewater COD concentration to 34.32 mg/L,and the removal rate is 91.9%.Further research shows that the increase in hydraulic retention time and ozone concentration significantly improves the wastewater treatment effect.Reusing the treated wastewater for ore beneficiation can effectively eliminate the influence of reused water on the instability factors of ore beneficiation,and it is close to the beneficiation index of clean water.Under stable operation,this process can not only realize the efficient treatment and reuse of mineral processing wastewater,but also has a lower processing cost of 2.65￥/m^(3),which can provide usable technical experience for the reuse of wastewater from domestic lead-zinc processing plants.

关 键 词：选矿废水 臭氧氧化 生化法 水力停留时间 回用 凡口铅锌矿 

分 类 号：TD926.5[矿业工程—选矿]