渗滤液灌溉及覆盖土壤类型对城市固体废弃物填埋场氧化亚氮排放的影响

[Effects of leachate irrigation and cover soil type on N2O emission from municipal solid waste landfill].

作者信息

He Pin-Jing, Chen Miao, Zhang Hou-Hu, Shao Li-Ming

机构信息

State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.

出版信息

Ying Yong Sheng Tai Xue Bao. 2008 Jul;19(7):1591-6.

PMID:18839924

Abstract

By the method of static chamber, the seasonal and diurnal variations of N2O fluxes in two full-scale municipal solid waste (MSW) landfills covered with sandy and clay soils were measured to study the effects of leachate irrigation and cover soil type on the landfill N2O emission. The results showed that the N2O flux in the MSW landfill covered with sandy soil was (242 +/- 576) microg N2O-N x m(-2) x h(-1) in summer, being 3.2 times (P > 0.05) as high as that in spring [(74.4 +/- 314) microg N2O-N x m(-2) x h(-1), while the N2O flux in the MSW landfill covered with clay soil was (591 +/- 767) microg N2O-N x m(-2) x h(-1) in summer, being 2.2 times (P < 0.05) as high as that in spring [(269 +/- 335) microg N2O-N x m(-2) x h(-1)]. Leachate irrigation promoted the N2O emission from the soil cover of the landfill covered with sandy soil, and the N2O flux in the landfill was 1 time higher than that of the control (P > 0.05). Under leachate irrigation, the average N2O flux in spring and summer in the landfill covered with sand soil was (211 +/- 460) microg N2O-N x m(-2) x h(-1), being only 1/2 of that [(430 +/- 605) microg N2O-N x m(-2) x h(-1)] in the landfill covered with clay soil without leachate irrigation (P > 0.05 ). Therefore, no matter leachate irrigation was conducted or not, the N2O emission from MSW landfill could be minimized by covering with infertile sandy soil.

摘要

采用静态箱法，对两座分别覆盖沙土和黏土的全尺寸城市生活垃圾填埋场中N2O通量的季节和日变化进行了测量，以研究渗滤液灌溉和覆盖土壤类型对填埋场N2O排放的影响。结果表明，夏季覆盖沙土的生活垃圾填埋场N2O通量为(242±576)μg N2O-N·m-2·h-1，是春季[(74.4±314)μg N2O-N·m-2·h-1]的3.2倍(P>0.05)；而夏季覆盖黏土的生活垃圾填埋场N2O通量为(591±767)μg N2O-N·m-2·h-1，是春季[(269±335)μg N2O-N·m-2·h-1]的2.2倍(P<0.05)。渗滤液灌溉促进了覆盖沙土的填埋场土壤覆盖层的N2O排放，该填埋场的N2O通量比对照高1倍(P>0.05)。在渗滤液灌溉条件下，覆盖沙土的填埋场春夏季平均N2O通量为(211±460)μg N2O-N·m-2·h-1，仅为未进行渗滤液灌溉的覆盖黏土的填埋场[(430±605)μg N2O-N·m-2·h-1]的1/2(P>0.05)。因此，无论是否进行渗滤液灌溉，用贫瘠的沙土覆盖均可使生活垃圾填埋场的N2O排放降至最低。