Abstract:

As China gradually enters into the “mainly incinerated， lastly landfill” waste terminal treatment pattern， cities are actively promoting “zero landfill” for primary domestic waste. Waste incineration plants and their leachate treatment have become a hot topic of concern in the industry. Compared with landfill leachate， leachate from waste incineration plant has higher concentration of COD_Cr and SS， which makes treatment more difficult， and relatively lower ammonia nitrogen content and suitable carbon to nitrogen ratio， which is conducive to denitrogenation treatment. Taking the leachate treatment project of a domestic waste incineration plant as an example， the water quality characteristics， the important and difficult points of process selection and process system design were elaborated. The leachate treatment scale was 800 m³/d. The combined treatment process of internal circulation（IC） anaerobic reactor + two-stage A/O+UF+NF+RO was adopted to ensure that the effluent met the water quality standard of supplementary water of open circulating cooling water system in The Reuse of Urban Recycling Water： Water Quality Standard for Industrial Uses（GB/T 19923—2005）. The combined treatment process has the advantages of efficient degradation of organic matter and ammonia nitrogen， strong resistance to shock load， stable effluent quality and low operation cost. The reclaimed water， concentrate， biogas， sludge and odor generated by leachate treatment system were co-processed by the incineration system，saving project investment， site area， operating costs， and achieving zero discharge of leachate treatment. Since the project was running， all treatment units had been operating normally， and the effluent quality had stably met the design requirements. The operating cost of leachate treatment system was RMB 32.36/m³.

Key words: waste incineration plant, leachate, IC anaerobic reactor, co-processing

摘要：

随着我国逐步进入“焚烧为主，填埋托底”的垃圾终端处理格局，各地均开始积极推进原生生活垃圾“零填埋”。垃圾焚烧厂及其渗滤液的处理成为行业关注的热点。相比于垃圾填埋场渗滤液，垃圾焚烧厂的渗滤液COD_Cr和SS浓度更高，处理难度增加，其氨氮含量相对较低，碳氮比协调，有利于脱氮处理。以某生活垃圾焚烧厂的渗滤液处理项目为例，详细阐述了水质特性、工艺选择的重难点和工艺系统设计。渗滤液处理规模为800 m³/d，采用IC厌氧反应器+两级A/O+UF+NF+RO组合处理工艺，确保出水达到《城市污水再生利用 工业用水水质》（GB/T 19923—2005）中敞开式循环冷却水系统补充水的水质标准。该组合处理工艺具有高效降解有机物和氨氮，耐冲击负荷能力强，出水水质稳定达标，运行成本低等优点。渗滤液处理系统产生的回用水、浓缩液、沼气、污泥、臭气通过焚烧系统协同处理，节省了项目投资、占地面积和运行成本，实现了渗滤液处理零排放。该项目运行至今各处理单元均正常运行，出水水质稳定达到设计要求。渗滤液处理系统运行成本为32.36元/m³。

关键词: 垃圾焚烧厂, 渗滤液, IC厌氧反应器, 协同处理

CLC Number: 

• X703.1