School of Environment, Tsinghua University, Beijing 100084, China.
J Environ Manage. 2013 Oct 15;128:259-65. doi: 10.1016/j.jenvman.2013.05.014. Epub 2013 Jun 10.
Waste samples at different depths of a covered municipal solid waste (MSW) landfill in Beijing, China, were excavated and characterized to investigate the impact of intermediate soil cover on waste stabilization. A comparatively high amount of unstable organic matter with 83.3 g kg(-1) dry weight (dw) total organic carbon was detected in the 6-year-old MSW, where toxic inorganic elements containing As, Cd, Cr, Cu, Mn, Ni, Pb, and Zn of 10.1, 0.98, 85.49, 259.7, 530.4, 30.5, 84.0, and 981.7 mg kg(-1) dw, respectively, largely accumulated because of the barrier effect of intermediate soil cover. This accumulation resulted in decreased microbial activities. The intermediate soil cover also caused significant reduction in moisture in MSW under the soil layer, which was as low as 25.9%, and led to inefficient biodegradation of 8- and 10-year-old MSW. Therefore, intermediate soil cover with low permeability seems to act as a barrier that divides a landfill into two landfill cells with different degradation processes by restraining water flow and hazardous matter.
对中国北京的一个有覆盖层的城市固体废物（MSW）填埋场不同深度的废物样本进行了挖掘和特征分析，以研究中间土壤覆盖对废物稳定化的影响。在有 6 年历史的 MSW 中，检测到相当大量的不稳定有机物，其总有机碳干重（dw）为 83.3gkg(-1)，其中含有 As、Cd、Cr、Cu、Mn、Ni、Pb 和 Zn 的有毒无机元素分别为 10.1、0.98、85.49、259.7、530.4、30.5、84.0 和 981.7mgkg(-1)dw，大量积累是由于中间土壤覆盖的阻隔作用。这种积累导致微生物活性降低。中间土壤覆盖还导致土壤层下 MSW 中的水分显著减少，低至 25.9%，导致 8 年和 10 年的 MSW 生物降解效率低下。因此，渗透性低的中间土壤覆盖似乎起到了阻隔作用，通过抑制水流和有害物质，将填埋场分成两个具有不同降解过程的填埋单元。
