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Anaerobic digestion potential of urban organic waste: a case study in Malmoe

机译：城市有机废物的厌氧消化潜力：以马尔默为例

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A study of existing organic waste types in Malmoe, Sweden was performed. The purpose was to gather information about organic waste types in the city to be able to estimate the potential for anaerobic treatment in existing digesters at the wastewater treatment plan (WWTP). The urban organic waste types that could have a significant potential for anaerobic digestion amount to about 50 000 tonnes year~(-1) (sludge excluded). Some of the waste types were further evaluated by methane potential tests and continuous pilot-scale digestion. Single-substrate digestion and co-digestion of pre-treated, source-sorted organic fraction of municipal solid waste, waste-water sludge, sludge from grease traps and fruit and vegetable waste were carried out. The experiments showed that co-digestion of grease sludge and WWTP sludge was a better way of making use of the methane potential in the grease trap sludge than single-substrate digestion. Another way of increasing the methane production in sludge digesters is to add source-sorted organic fraction of municipal solid waste (SSOFMSW). Adding SSOFMSW (20% of the total volatile solids) gave a 10-15% higher yield than could be expected by comparison with separate digestion of sludge respective SSOFMSW. Co-digestion of sludge and organic waste is beneficial not just for increasing gas production but also for stabilizing the digestion process. This was seen when co-digesting fruit and vegetable waste and sludge. When co-digested with sludge, this waste gave a better result than the separate digestion of fruit and vegetable waste. Considering single-substrate digestion, SSOFMSW is the only waste in the study which makes up a sufficient quantity to be suitable as the base substrate in a full-scale digester that is separated from the sludge digestion. The two types of SSOFMSW tested in the pilot-scale digestion were operated successfully at mesophilic temperature. By adding SSOFMSW, grease trap sludge and fruit and vegetables waste to sludge digesters at the wastewater treatment plant, the yearly energy production from methane could be expected to increase from 24 to 43 GWh.
机译：对瑞典马尔默市现有的有机废物类型进行了研究。目的是收集有关城市有机废物类型的信息，以便能够根据废水处理计划（WWTP）估算现有沼气池中厌氧处理的潜力。可能具有很大厌氧消化潜力的城市有机废物类型约为每年5万吨〜（-1）（不包括污泥）。通过甲烷潜力测试和连续中试规模消化，进一步评估了某些废物类型。对经过处理的，按源分类的城市固体废物，废水污泥，油脂捕集器产生的污泥以及果蔬废物进行了单底物消化和共同消化。实验表明，与单底物消化相比，共消化油脂污泥和WWTP污泥是利用油脂捕集污泥中甲烷潜力的更好方法。增加污泥消化池中甲烷产量的另一种方法是添加按来源分类的城市固体废物有机成分（SSOFMSW）。加入SSOFMSW（占总挥发性固体的20％），与分别消化污泥的SSOFMSW相比，可得到的产率高出10-15％。污泥和有机废物的共消化不仅有益于增加气体产量，而且有利于稳定消化过程。这是在共同消化水果和蔬菜废物及污泥时看到的。当与污泥一起消化时，与单独消化水果和蔬菜废物相比，这种废物产生了更好的结果。考虑到单底物消化，SSOFMSW是研究中唯一的废物，其浪费量足以适合作为与污泥消化分离的全尺寸消化池的基础底物。在中试消化中测试的两种SSOFMSW在中温温度下成功运行。通过向污水处理厂的污泥消化池中添加SSOFMSW，隔油池污泥以及水果和蔬菜废物，预计甲烷的年发电量将从24 GWh增加到43 GWh。

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