Xu Jie, Mustafa Ahmed M, Lin Hongjian, Choe Ung Yong, Sheng Kuichuan
College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China; Department of Agricultural Engineering, Faculty of Agriculture, Suez Canal University, Ismailia 41522, Egypt.
Waste Manag. 2018 Aug;78:849-856. doi: 10.1016/j.wasman.2018.07.003. Epub 2018 Jul 7.
Incineration and burial are the current practices for pig carcasses disposal but are not environmentally friendly. Anaerobic digestion can be a better alternative if the process inhibition by carcass digestion can be ameliorated. This study successfully mitigated the inhibition in anaerobic digestion of carcasses by hydrochar addition and by co-digestion with RS and HRS. Biogas production from SP of the pretreated hydrothermal carcasses was enhanced by 60.7 to 90.8% through hydrochar addition. The highest biogas production of 450 mL/g-VS was obtained at 4 g-hydrochar/L addition. The methane content was also increased from 57.5% to up to 69.8%. Each gram of hydrochar removed 25 mg of ammonium and 50 mg of VFA. Hydrochar addition promoted the conversion of VFA to biogas by strengthening the intensity of functional groups and the immobilization of microbial biomass. Co-digestion of SP with RS or HRS also increased the biogas production, and the optimal production of 428 mL/g VS was obtained at 70% SP and 30% RS. The co-digestion of carcass SP with RS and the addition of hydrochar can be a promising solution for improving biogas production from a pig carcass, and can be potentially developed as a sustainable waste management method.
焚烧和掩埋是目前处理猪尸体的方法，但并不环保。如果能改善尸体消化对厌氧消化过程的抑制作用，厌氧消化可能是一个更好的选择。本研究通过添加生物炭以及与稻壳（RS）和热解稻壳（HRS）共消化成功减轻了尸体厌氧消化中的抑制作用。通过添加生物炭，预处理的水热尸体的污泥（SP）产生的沼气产量提高了60.7%至90.8%。添加4 g生物炭/L时，获得了最高沼气产量450 mL/g-VS。甲烷含量也从57.5%提高到了69.8%。每克生物炭去除了25 mg铵和50 mg挥发性脂肪酸（VFA）。添加生物炭通过增强官能团强度和固定微生物生物量促进了VFA向沼气的转化。SP与RS或HRS共消化也增加了沼气产量，在70%SP和30%RS时获得了428 mL/g VS的最佳产量。尸体SP与RS共消化以及添加生物炭可能是提高猪尸体沼气产量的一种有前景的解决方案，并且有可能发展成为一种可持续的废物管理方法。
