LIXiang-dong,CHENFang-fang,YAOPeng,et al.Treatment of Landfill Leachate Membrane Concentrate via Low Temperature Evaporation Technology[J].China Water & Wastewater,2025,41(3):84-88.
低温蒸发技术处理垃圾渗滤液膜浓缩液
- Title:
- Treatment of Landfill Leachate Membrane Concentrate via Low Temperature Evaporation Technology
- 摘要:
- 采用低温蒸发技术对某垃圾焚烧厂渗滤液反渗透膜浓缩液进行减量化处理，考察了系统的运行稳定性、减量化效果、污染物去除效果、综合运行成本，评估了处理反渗透膜浓缩液的污染情况，并探究了换热器污染控制措施。结果表明，采用该技术可实现平均浓缩倍率达到2 倍，低温蒸发系统运行稳定，产水电导率均值小于26 μS/cm，脱盐率为99.9%，产水COD均值小于20 mg/L，Cl- 浓度小于7 mg/L，pH接近中性，总体水质优于《城市污水再生利用 工业用水水质》（GB/T 19923—2005）中再生水用作工业用水水源的水质标准。系统采用垃圾焚烧厂废热作为热源，可不考虑热源成本，综合运行成本为14.88 元/m3。系统换热器为主要污染部位，换热器污染速率与浓缩倍率呈正相关，污染物以有机物为主，可通过在线化学清洗和调控浓缩倍率实现对污染速率的控制。
- Abstract:
- Low temperature evaporation technology was employed to decrease the concentration of reverse osmosis (RO) concentrate from the leachate of a garbage incineration plant. This study examined the operational stability, reduction efficiency, pollutants removal performance, and comprehensive operating cost of the system. Additionally, it evaluated the environmental impact of the RO concentrate after treatment and investigated pollution control measures for the heat exchanger. By employing this technology, the average concentration ratio could be doubled. The low temperature evaporation system operated stably, with the average conductivity of the produced water being less than 26 μS/cm. The desalination rate reached as high as 99.9%, while the average COD of the produced water was below 20 mg/L and the average Cl- concentration was less than 7 mg/L. Additionally, the pH remained near neutral. The overall water quality significantly surpassed the limits outlined in The Reuse of Urban Recycling Water—Water Quality Standard for Industrial Uses (GB/T 19923-2005). The system utilized waste heat from the garbage incineration plant as a heat source. Without accounting for the cost of this heat source, the comprehensive operating cost was 14.88 yuan/m3. The system’s heat exchanger was the main pollutant site, and the pollution rate of the heat exchanger exhibited a positive correlation with the concentration ratio. The primary pollutants consisted of organic compounds. This pollution rate could be effectively managed through online chemical cleaning and by adjusting the concentration ratio.
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