Wu Huanan, Wang Qian, Ko Jae Hac, Xu Qiyong
Shenzhen Engineering Laboratory for Eco-efficient Polysilicate Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, PR China.
Shenzhen Engineering Laboratory for Eco-efficient Polysilicate Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, PR China.
Waste Manag. 2018 Aug;78:164-172. doi: 10.1016/j.wasman.2018.05.032. Epub 2018 May 28.
As a main byproduct of municipal solid waste incineration (MSWI), bottom ash (BA) has become a big challenge in operating MSWI plants. The most common method for BA treatment is co-disposal with MSW in landfills, which may cause clogging in the leachate collection system (LCS). This research investigated the characteristics of geotextile clogging in landfills with BA co-disposal. The co-disposal of BA changed the characteristics of leachate, especially increasing the concentration of Ca. During the experiment, 0.14 g CaCO was precipitated in the MSW geotextile, while it increased to 0.52 g CaCO in the BA co-disposed geotextile. Based on mass balance of calcium and thermogravimetric (TG) analysis, the formation of biofilm was the main contributor to the mass increment, accounting for about 82% and 57% mass increment in the MSW and BA co-disposed geotextile, respectively. Moreover, CO in landfill gas played an important role in the clogging process, including CaCO precipitation and biofilm formation. The results suggested that the co-disposal of BA with MSW can increase the risk of geotextile clogging in landfills.
作为城市固体废弃物焚烧（MSWI）的主要副产品，底灰（BA）已成为MSWI工厂运营中的一大挑战。处理底灰最常见的方法是将其与城市固体废弃物一同填埋，这可能会导致渗滤液收集系统（LCS）堵塞。本研究调查了底灰共处置填埋场中土工织物的堵塞特性。底灰的共处置改变了渗滤液的特性，尤其是增加了钙的浓度。实验期间，城市固体废弃物土工织物中沉淀了0.14克碳酸钙，而在底灰共处置土工织物中增加到了0.52克碳酸钙。基于钙的质量平衡和热重（TG）分析，生物膜的形成是质量增加的主要原因，分别占城市固体废弃物和底灰共处置土工织物质量增加的约82%和57%。此外，填埋气中的二氧化碳在堵塞过程中起重要作用，包括碳酸钙沉淀和生物膜形成。结果表明，底灰与城市固体废弃物共处置会增加填埋场土工织物堵塞的风险。
