Dipartimento di Meccanica e Materiali, Università Mediterranea di Reggio Calabria, Reggio Calabria, Italy.
J Hazard Mater. 2010 Sep 15;181(1-3):962-8. doi: 10.1016/j.jhazmat.2010.05.107. Epub 2010 May 31.
The membrane-based processes are among the most used techniques for leachate treatment in modern landfills but its environmental, technical and economical sustainability strongly depends on the disposal of concentrated leachate that is produced there. This paper presents the monitoring study of the landfill of the municipality of Monsummano Terme (Pistoia province, Tuscany, Italy) named "Il Fossetto" where concentrated leachate obtained during membrane treatment is recirculated. The findings resulting from the first 30 months of monitoring of concentrated leachate recirculation show that leachate production did not increase significantly and that only a few quality parameters (i.e. COD, Nickel and Zinc) presented a moderate increase. Moreover, the latest data on biogas composition seem to indicate a reduction in methane content that, if confirmed, could be related to the partial inhibition of methanogens due to the competition of sulphate reducing bacteria. The non-accumulation of other conservative pollutants such as Ammonia Nitrogen and Chloride in the leachate is still under investigation and needs to be better clarified. The overall sustainability of the reinjection as a means of disposing of the concentrated leachate produced by membrane treatment should be further analysed and evaluated in the long term.
膜处理工艺是现代垃圾填埋场中最常用的渗滤液处理技术之一，但该技术的环境、技术和经济可持续性在很大程度上取决于浓缩渗滤液的处理。本文介绍了意大利托斯卡纳皮斯托亚省蒙松马诺泰尔梅市（Monsummano Terme）名为“Il Fossetto”的垃圾填埋场的监测研究，该填埋场对膜处理过程中产生的浓缩渗滤液进行了再循环。浓缩渗滤液再循环监测的头 30 个月的结果表明，渗滤液的产生并没有显著增加，只有少数质量参数（即 COD、镍和锌）略有增加。此外，关于沼气成分的最新数据似乎表明甲烷含量有所降低，如果这一情况得到证实，可能与硫酸盐还原菌的竞争导致产甲烷菌受到部分抑制有关。其他保守污染物（如氨氮和氯）在渗滤液中没有累积，这仍在调查中，需要进一步澄清。长期来看，还需要进一步分析和评估再注入作为处理膜处理产生的浓缩渗滤液的方法的整体可持续性。
