Landfill leachate is high-strength wastewater containing harmful pollutants and very rich in ammonia (NH₃), an undesired element in wastewaters. NH₃ is used as a liquid fertilizer in agriculture and as a reactant in many other fields. The present study investigated the reclamation of NH₃ during the treatment of middle-age landfill leachate by direct contact membrane distillation (DCMD) with polytetrafluoroethylene (PTFE) and polyvinylidene difluoride (PVDF) 0.45 µm pore size membranes. Synthetic and real wastewaters were used during the study. pH, temperature and salt content of the solution highly affected the reclamation efficiency of NH₃. Low reclamation of NH₃ from the real leachate was reported compared to synthetic solutions, due to the solution characteristic. With low salinity, high salinity synthetic solution and real landfill leachate as feed solutions heated to 60 °C, the reclamation efficiency of NH₃ by PTFE membrane, determined as the best membrane in this study, was 81.1%, 97.6% and 58.4, respectively. The autopsy of the PTFE membrane by SEM analysis, FTIR and contact angle, after 72 h operation showed very little damage to the membrane but depicted the deposition of some particles on the membrane surface, causing the flux to drop from 12.7 to 11.9 L/m² h.

中文翻译：

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通过膜蒸馏从高氨污染溶液中回收氨氮

垃圾渗滤液是一种高强度废水，含有有害污染物，并且非常富含氨（NH ₃），这是废水中不希望的元素。NH ₃在农业中用作液体肥料，并在许多其他领域用作反应物。本研究调查了中龄垃圾填埋场渗滤液处理过程中的NH ₃的回收，该过程采用孔径为0.45 µm的聚四氟乙烯（PTFE）和聚偏二氟乙烯（PVDF）的直接接触膜蒸馏（DCMD）。在研究过程中使用了合成废水和实际废水。溶液的pH值，温度和盐含量极大地影响NH ₃的再生效率。NH _3的低回收据报道，由于溶液的特性，从真实渗滤液中提取的水与合成溶液相比有所增加。在将低盐度，高盐度合成溶液和实际垃圾填埋场渗滤液作为加热到60°C的进料溶液的情况下，被确定为本研究最佳膜的PTFE膜对NH ₃的再生效率分别为81.1％，97.6％和58.4。 。通过SEM分析，FTIR和接触角对PTFE膜进行尸检，在操作72小时后，对膜的破坏很小，但描绘出一些颗粒在膜表面的沉积，导致通量从12.7降至11.9 L / m ² 小时