Department of Ecological and Environmental Sciences, University of Helsinki, Niemenkatu 73 C, FIN-15140, Lahti, Finland.
Waste Manag. 2010 May;30(5):779-86. doi: 10.1016/j.wasman.2009.12.014. Epub 2010 Jan 12.
In the present study, we investigated the effects of two bulking materials, Sphagnum peat and pine wood chips, on the early stages of biowaste composting in two pilot-scale processes. Emphasis was placed on studying the formation conditions of malodorous compost gases in the initial phases of the processes. The results showed that gas emission leaving an open windrow and a closed drum composting system contained elevated concentrations of fermentative microbial metabolites when acid Sphagnum peat (pH 3.2) was used as a bulking material. Moreover, the gas emission of the peat amended drum composter contained a high concentration of odour (up to 450,000oum(-3) of air). The highest odour values in the outlet gas of peat amended composts coincided with the elevated concentrations of volatile organic compounds such as acetoin and buthanedion. We conclude that the acidifying qualities of composting substrates or bulking material may intensify odour emission from biowaste composts and prolong the early stages of the composting process.
在本研究中，我们研究了两种膨化材料——泥炭藓和松木屑——对两个中试规模生物废物堆肥过程早期阶段的影响。重点研究了在工艺初始阶段恶臭堆肥气体形成的条件。结果表明，当使用酸性泥炭藓（pH3.2）作为膨化材料时，开放式条垛和封闭式转鼓堆肥系统中气体排放物含有较高浓度的发酵微生物代谢物。此外，泥炭改良转鼓堆肥器的气体排放物含有高浓度的气味（空气中高达 450,000oum(-3)）。泥炭改良堆肥中出口气体的最高气味值与挥发性有机化合物（如乙酰丙酮和丁二酮）的浓度升高相一致。我们得出结论，堆肥基质或膨化材料的酸化特性可能会加剧生物废物堆肥的气味排放，并延长堆肥过程的早期阶段。
