Enhancement of dry anaerobic batch digestion of the organic fraction of municipal solid waste by an aerobic pretreatment step

E.ten Brummeler, I.W. Koster
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引用次数: 80

Abstract

The start-up of the dry anaerobic batch digestion by the BIOCEL-concept of the organic fraction of municipal solid waste (MSW) is unbalanced when a methanogenic inoculum (digested sewage sludge) is added to a total solids concentration of 35%. The unbalanced conditions are the result of the rapid degradation of easily-degradable compounds which are present in the organic fraction. Enhancement of the first start-up of the dry batch digestion was tried by applying an aerobic partial-composting step. By this aerobic treatment the easily degradable compounds are removed. After the composting step the anaerobic digestion will be limited by the conversion of the ligno-cellulose part of the organic fraction. It appeared that at least 19·5% of the volatile solids (VS) should be converted during the aerobic composting period before acid formation in the digestion was in balance with the methane formation. This amount of aerobically degraded VS means a 40% loss of potential biogas. The loss of a part of the biogas is a major drawback to the partial composting as a method for enhancing the start-up of the dry anaerobic digestion. A shorter composting period which is combined with another start-up method might be a feasible method to decrease the energy input of the dry digestion process.

用好氧预处理步骤增强城市生活垃圾有机组分的干式厌氧分批消化
当产甲烷菌(消化的污水污泥)添加到总固体浓度为35%时,biocel概念对城市生活垃圾(MSW)有机部分进行干式厌氧分批消化的启动是不平衡的。不平衡的条件是由于存在于有机组分中的易降解化合物的快速降解的结果。通过施用好氧部分堆肥步骤,尝试提高干批消化的首次启动。通过这种好氧处理去除易降解的化合物。在堆肥步骤之后,厌氧消化将受到有机组分中木质素-纤维素部分转化的限制。结果表明,在好氧堆肥过程中,至少有19.5%的挥发性固体(VS)需要转化,消化过程中的酸生成与甲烷生成才能达到平衡。这个数量的好氧降解VS意味着潜在沼气损失40%。部分沼气的损失是部分堆肥作为一种提高干式厌氧消化启动的方法的主要缺点。缩短堆肥周期并结合另一种启动方法可能是减少干消化过程能量输入的可行方法。
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