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Comparison of bio-clogging characteristics of geotextiles in MSW and bottom ash co-disposal landfills
Waste Management ( IF 7.1 ) Pub Date : 2020-10-27 , DOI: 10.1016/j.wasman.2020.10.003
Qian Wang , Jae Hac Ko , Qiyong Xu

Bio-clogging of geotextile is a big challenge for the leachate collection system in landfills. It is important to understand the characteristics of geotextile bio-clogging to develop control technologies. This study investigated the characteristics of geotextile bio-clogging in municipal solid waste landfill (MSW_G) and bottom ash (BA) co-disposal landfill (BA_G). Results showed that the bio-clogging mass of per area in MSW_G and BA_G was 49 ± 5 g/m2 and 57 ± 3 g/m2, respectively. Bio-clogging was dominated by live cells in both MSW_G and BA_G. The confocal laser scanning microscopy images revealed that live cells percentage was 46% in MSW_G, while it increased to 77% in BA_G. In contrast, the percentage of the dead cells was 47% and 9% in MSW_G and BA_G, respectively. The biofilm formed in BA _G was thinner and denser than that in MSW_G. Based on the microbial analysis, the biofilms of BA_G had a higher genetic amount and diversity than these of MSW_G. The total amount of extracellular polymeric substances in BA_G was 45.29 ± 4.52 mg/g volatile suspended solids, which was 1.5 times of that in MSW_G. The co-disposal of BA increased the microbial diversity and accelerated bio-clogging due to the high calcium concentration. These findings provide a better understanding of the bio-clogging characteristics, which is helpful to control bio-clogging in co-disposal landfills.



中文翻译:

都市固体废弃物和底灰共同处置垃圾填埋场土工生物堵塞特征的比较

土工织物的生物堵塞是垃圾填埋场渗滤液收集系统的一大挑战。重要的是要了解土工织物生物堵塞的特征,以开发控制技术。本研究调查了市政固体垃圾填埋场(MSW_G)和底灰(BA)共处理垃圾填埋场(BA_G)中土工布生物堵塞的特征。结果表明,MSW_G和BA_G中每单位面积的生物阻塞质量为49±5 g / m 2和57±3 g / m 2, 分别。在生物垃圾中,MSW_G和BA_G中的活细胞占主导地位。共聚焦激光扫描显微镜图像显示,MSW_G中活细胞百分比为46%,而BA_G中活细胞百分比增加至77%。相反,MSW_G和BA_G中死细胞的百分比分别为47%和9%。BA _G中形成的生物膜比MSW_G中的生物膜薄且致密。根据微生物分析,BA_G的生物膜比MSW_G具有更高的遗传数量和多样性。BA_G中细胞外聚合物的总量为45.29±4.52 mg / g挥发性悬浮固体,是MSW_G中的1.5倍。由于高钙浓度,BA的共同处置增加了微生物多样性并加速了生物堵塞。这些发现可以更好地理解生物阻塞特性,

更新日期:2020-10-30
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