University of Jyväskylä, Department of Biological and Environmental Science, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
University of Jyväskylä, Department of Biological and Environmental Science, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
Waste Manag. 2014 Oct;34(10):1853-9. doi: 10.1016/j.wasman.2014.06.005. Epub 2014 Jul 4.
In this study, mono-digestion of rendering wastes and co-digestion of rendering wastes with potato pulp were studied for the first time in continuous stirred tank reactor (CSTR) experiments at 55°C. Rendering wastes have high protein and lipid contents and are considered good substrates for methane production. However, accumulation of digestion intermediate products viz., volatile fatty acids (VFAs), long chain fatty acids (LCFAs) and ammonia nitrogen (NH4-N and/or free NH3) can cause process imbalance during the digestion. Mono-digestion of rendering wastes at an organic loading rate (OLR) of 1.5 kg volatile solids (VS)/m(3)d and hydraulic retention time (HRT) of 50 d was unstable and resulted in methane yields of 450 dm(3)/kg VS(fed). On the other hand, co-digestion of rendering wastes with potato pulp (60% wet weight, WW) at the same OLR and HRT improved the process stability and increased methane yields (500-680 dm(3)/kg VS(fed)). Thus, it can be concluded that co-digestion of rendering wastes with potato pulp could improve the process stability and methane yields from these difficult to treat industrial waste materials.
本研究首次在 55°C 的连续搅拌槽式反应器（CSTR）实验中，对制革废物的单消化和制革废物与马铃薯浆的共消化进行了研究。制革废物具有高蛋白和高脂肪含量，被认为是生产甲烷的良好基质。然而，在消化过程中，消化中间产物如挥发性脂肪酸（VFAs）、长链脂肪酸（LCFAs）和氨氮（NH4-N 和/或游离 NH3）的积累会导致过程失衡。在有机负荷率（OLR）为 1.5kg 挥发性固体（VS）/m(3)d 和水力停留时间（HRT）为 50d 的条件下，制革废物的单消化不稳定，甲烷产率为 450dm(3)/kgVS(进料)。另一方面，在相同的 OLR 和 HRT 下，制革废物与马铃薯浆（湿重 60%）的共消化提高了工艺稳定性，并增加了甲烷产率（500-680dm(3)/kgVS(进料)）。因此，可以得出结论，制革废物与马铃薯浆的共消化可以提高这些难以处理的工业废物的工艺稳定性和甲烷产率。
