MADong-bing,YUEZheng,DINGXi-ming,et al.Application of Two-stage AO, Built-in Ultrafiltration and Two-stage Nanofiltration Process for the Treatment of Landfill Leachate[J].China Water & Wastewater,2022,38(18):78-82.
两级AO+内置式超滤+两级纳滤工艺处理垃圾渗滤液
- Title:
- Application of Two-stage AO, Built-in Ultrafiltration and Two-stage Nanofiltration Process for the Treatment of Landfill Leachate
- Keywords:
- landfill leachate; two-stage AO; NF; concentrate
- 摘要:
- 设计采用两级AO+内置式超滤+两级纳滤工艺处理天津市某垃圾填埋场渗滤液，处理规模为700 m3/d。一级纳滤浓缩液采用两级芬顿高级氧化处理工艺，出水回流至均衡池，处理规模为218 m3/d；二级纳滤浓缩液直接回流至超滤出水池。生化系统产生的生化污泥和浓缩液处理系统产生的化学污泥，分别经浓缩压滤脱水后含水率达到60%，生化污泥脱水滤液回流至均衡池，化学污泥脱水滤液回流至一级芬顿反应池，泥饼运至填埋场填埋处置。系统建成后运行至今，出水水质满足《生活垃圾填埋场污染控制标准》（GB 16889—2008）中的表2标准，COD、NH3-N、TN及TP总去除率分别达到99.3%、99.9%、99.0%、92.3%。该工艺处理效果良好、运行稳定、自动化程度高。项目的实施解决了该垃圾填埋场渗滤液处理能力不足的问题，具有良好的环境效益和社会效益。
- Abstract:
- A process consisting of two-stage AO, built-in ultrafiltration and two-stage nanofiltration was designed to treat leachate from a landfill in Tianjin, and its treatment scale was 700 m3/d. A two-stage Fenton advanced oxidation process was employed to treat the primary nanofiltration concentrate, its treatment scale was 218 m3/d, and the effluent was returned to the equalization tank. The secondary nanofiltration concentrate was returned directly to the ultrafiltration outlet tank. The biochemical sludge produced by the biochemical system and the chemical sludge produced by the concentrate treatment system were dehydrated by concentration and pressure filtration to reduce the water content to 60%. The biochemical sludge dewatering filtrate was returned to the equalization tank, the chemical sludge dewatering filtrate was returned to the primary Fenton reaction tank, and the sludge cake was transported to a landfill for landfill disposal. Since the completion of the system, the effluent quality met the table 2 limit specified in Standard for Pollution Control on the Landfill Site of Municipal Solid Waste (GB 16889-2008), and the removal efficiencies of COD, NH3-N, TN and TP reached 99.3%, 99.9%, 99.0% and 92.3%, respectively. The process had a good treatment performance, stable operation and high degree of automation. The implementation of the project has solved the problem of insufficient leachate treatment capacity of the original project, and has good environmental and social benefits.
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