Hartmann Hinrich, Ahring Birgitte K
The Environmental Microbiology/Biotechnology Research Group, Technical University of Denmark, BioCentrum-DTU, Building 227, Soltofts Plads, DK-2800 Lyngby, Denmark.
Water Res. 2005 Apr;39(8):1543-52. doi: 10.1016/j.watres.2005.02.001. Epub 2005 Apr 1.
Anaerobic digestion of the organic fraction of municipal solid waste (OFMSW) was investigated in two thermophilic (55 degrees C) wet digestion treatment systems R1 and R2. Initially OFMSW was co-digested with manure with a successively higher concentration of OFMSW, at a hydraulic retention time (HRT) of 14-18 d and an organic loading rate (OLR) of 3.3-4.0 g-VS/l/d. Adaptation of the co-digestion process to a OFMSW:manure ratio of 50% (VS/VS) was established over a period of 6 weeks. This co-digestion ratio was maintained in reactor R2 while the ratio of OFMSW to manure was slowly increased to 100% in reactor R1 over a period of 8 weeks. Use of recirculated process liquid to adjust the organic loading to R1 was found to have a beneficial stabilization effect. The pH rose to a value of 8 and the reactor showed stable performance with high biogas yield and low VFA levels. The biogas yield from source-sorted OFMSW was 0.63-0.71 l/g-VS both in the co-digestion configuration and in the treatment of 100% OFMSW with process liquid recirculation. This yield is corresponding to 180-220 m3 biogas per ton OFMSW. VS reduction of 69-74% was achieved when treating 100% OFMSW. None of the processes showed signs of inhibition at the free ammonia concentration of 0.45-0.62 g-N/l.
在两个嗜热（55摄氏度）湿式消化处理系统R1和R2中，对城市固体废物有机部分（OFMSW）的厌氧消化进行了研究。最初，OFMSW与粪便进行共消化，OFMSW的浓度逐渐升高，水力停留时间（HRT）为14 - 18天，有机负荷率（OLR）为3.3 - 4.0克挥发性固体/升/天。在6周的时间内，使共消化过程适应OFMSW与粪便的比例为50%（VS/VS）。在反应器R2中保持该共消化比例，而在8周的时间内，反应器R1中OFMSW与粪便的比例缓慢增加至100%。发现使用循环工艺液来调节R1的有机负荷具有有益的稳定作用。pH值升至8，反应器表现出稳定的性能，沼气产量高且挥发性脂肪酸（VFA）水平低。在共消化配置以及用工艺液循环处理100%的OFMSW时，源分类OFMSW的沼气产量为0.63 - 0.71升/克挥发性固体。该产量相当于每吨OFMSW产生180 - 220立方米沼气。处理100%的OFMSW时，挥发性固体减少了69 - 74%。在游离氨浓度为0.45 - 0.62克氮/升时，没有任何一个过程显示出抑制迹象。
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