三维电解-A/O-臭氧工艺处理垃圾填埋场后期渗滤液  

Three‑dimensional Electrolysis-A/O-Ozone Process for Treatment of the Leachate in the Later Stage of Landfill

作　　者：柯水洲[1] 李书平 马晶伟[1] 李小琴 李嘉茵 KE Shui‑zhou;LI Shu‑ping;MA Jing‑wei;LI Xiao‑qin;LI Jia‑yin(School of Civil Engineering,Hunan University,Changsha 410082,China;Guangzhou Sunny Environmental Protection Technology Co.Ltd.,Guangzhou 510663,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]广州桑尼环保科技有限公司,广东广州510663

出　　处：《中国给水排水》2023年第23期1-7,共7页China Water & Wastewater

基　　金：国家自然科学基金资助项目(52070076);湖南省住房和城乡建设厅课题。

摘　　要：针对生活垃圾填埋场后期及封场后渗滤液氨氮浓度高、可生化性差、碳氮比失衡、生化处理困难等问题,采用三维电解-A/O-臭氧氧化组合工艺处理某生活垃圾填埋场的后期渗滤液,通过连续流运行调试及相关工艺参数调节,实现了工艺稳定运行及出水达标。最佳运行参数如下:连续流进水流量为3 L/h,pH为8~9;电解单元电解时间为16 h,电流强度为25 A;A/O工艺硝化及反硝化段停留时间均为16 h,硝化液回流比为200%,进水中投加碳源(葡萄糖)维持碳氮比(COD/TN)为9∶1;臭氧发生器出口臭氧浓度为56 mg/L(气态),臭氧催化氧化段进气量为3 L/min。组合工艺对COD、氨氮、总氮、总磷的去除率分别为96.41%、99.91%、98.68%和98.18%,出水水质达到《生活垃圾填埋场污染控制标准》(GB 16889—2008)中表2的要求;该系统的运行费用约为6.51元/m^(3)。Aiming at the problems of high ammonia nitrogen concentration,poor biodegradability,carbon-nitrogen ratio imbalance,and difficulty in biological treatment of leachate in the later stage of domestic waste landfill and after the landfill closure,a combined process of the three‑dimensional electrolysis,A/O and ozonation was employed to treat the leachate in the later stage of a landfill.Through the continuous operation and commissioning of the combined process system and the adjustment of related process parameters,the stable performance and effluent quality were achieved.The optimal operating parameters were as follow:continuous inlet flow of 3 L/h,pH of 8-9,the electrolysis time of 16 h,the current intensity of 25 A,the residence time of nitrification and denitrification of 16 h,the reflux ratio of nitrification liquid of 200%,the carbon to nitrogen ratio(COD∶TN)of 9∶1 by adding glucose as carbon source,the ozone concentration at the ozone generator outlet of 56 mg/L(gaseous),and the gas intake rate of the ozone catalytic oxidation section of 3 L/min.The removal rate of COD,NH_(3)-N,TN,and TP was 96.41%,99.91%,98.68%and 98.18%,respectively.The effluent quality met the requirements of Standard for Pollution Control on the Landfill Site of Municipal Solid Waste(GB 16889-2008),and the operating cost of the system was 6.51 yuan/m^(3).

关 键 词：垃圾填埋场后期渗滤液 三维电解 A/O 臭氧催化氧化 全量化处理 

分 类 号：TU992[建筑科学—市政工程]