Larson Steven L, Martin William A, Şengör S Sevinç, Wade Roy, Altamimi Faris
U.S. Army Engineer Research and Development Center, Environmental Laboratory, 3909 Halls Ferry Rd., Vicksburg, MS 39180, USA.
U.S. Army Engineer Research and Development Center, Installation Support Division, 3909 Halls Ferry Rd., Vicksburg, MS 39180, USA.
Sci Total Environ. 2021 Jun 10;772:145574. doi: 10.1016/j.scitotenv.2021.145574. Epub 2021 Feb 4.
Optimization of methane production rate can potentially decrease the operational lifetime of the landfill site and assist with better management of methane harvesting from the landfill cells. Increased moisture content in landfill cells is known to increase the rate of methane production. Several natural biopolymers can sustain moisture content in a solid matrix while providing a scaffolding for microbial communities to grow. This research examined the effect of the biopolymer, produced by Rhizobium tropici, on bench-scale methane generation from municipal solid waste. The addition of the R. tropici biopolymer increased the rate of methane production from 27% to 78% when compared to the control study for low and high concentrations of biopolymer amendment, respectively. R. tropici biopolymer shortened the lag phase by up to six days over the control, depending on the level of biopolymer amendment added to the solid waste. The mechanism appears to be facilitating biofilm formation through the combination of increased moisture retention and surface modification of the solid waste. Incorporation of biopolymer amendment in the alternative daily cover activities at commercial landfills could provide a viable approach for full scale application.
优化甲烷产生速率可能会缩短垃圾填埋场的运营寿命，并有助于更好地管理从垃圾填埋单元中收集甲烷。已知垃圾填埋单元中水分含量增加会提高甲烷产生速率。几种天然生物聚合物可以在固体基质中保持水分含量，同时为微生物群落生长提供支架。本研究考察了热带根瘤菌产生的生物聚合物对城市固体废物实验室规模甲烷生成的影响。与低浓度和高浓度生物聚合物添加量的对照研究相比，添加热带根瘤菌生物聚合物分别使甲烷产生速率提高了27%至78%。根据添加到固体废物中的生物聚合物添加量水平，热带根瘤菌生物聚合物比对照缩短了长达6天的滞后期。其机制似乎是通过增加水分保持和固体废物表面改性的组合来促进生物膜形成。在商业垃圾填埋场的替代日覆盖活动中加入生物聚合物添加剂可为大规模应用提供一种可行的方法。
