| environ. |
landfill gas Landfill gas is generated in landfill sites by the anaerobic decomposition of domestic refuse (municipal solid waste). It consists of a mixture of gases and is colourless with an offensive odour due to the traces of organosulphur compounds. Aside for its unpleasantness, it is highly dangerous as methane is explosive in concentrations in air between 5 per cent, the Lower Explosive Limit (LEL), and the Upper Explosive Limit (UEL) of 15 per cent. Landfill gas must be controlled at all operational landfill sites, whether actively or passively vented or both especially in the case of deep sites (填埋气体是由垃圾填埋场的生活垃圾(市区固体废弃物)厌氧分解产生的。它是一种混合气体，无色，并由于有有机硫化合物的有臭味。除了其令人不愉快的味道等，这种气体是非常危险的，甲烷浓度在空气中爆炸的下爆炸极限是百分之五，上爆炸极限是百分之十五。垃圾填埋气体必须在堆填区的所有可控区域内予以控制，无论是其自动释放或被动地释放，以及在深埋场同时利用两种方法。) |
