Zou Lianpei, Song Lin, Li Man, Wang Xuan, Huang Xiang, Zhang Yaning, Dong Bin, Zhou John, Li Xiaowei
School of Environmental and Chemical Engineering, Key Laboratory of Organic Compound Pollution Control, Ministry of Education, Shanghai University, Shanghai 200444, China.
College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
ACS Omega. 2021 Aug 19;6(34):22103-22113. doi: 10.1021/acsomega.1c02678. eCollection 2021 Aug 31.
Studies have shown that anaerobic digestion (AD) has an effect on the liquid and solid product property of sequential pyrolysis, but its influence on the gaseous products is lacking. In this study, syngas produced by pyrolysis from three raw organic solid wastes and the corresponding digestates, i.e., food waste, vinasse, and cow manure were investigated. AD causes a decrease in the contents of volatile solid, fixed carbon, C, H, and N and an increase in the S content. The weight loss of the wastes mainly occurs at 200-550 °C during the pyrolysis and the loss of the food waste and vinasse is higher than that of cow manure. In the carbon (C)-containing gas, AD leads to a decrease in the CH content of the syngas, implying that the heat values of the digestates are lower than that of the raw substrates. After AD, the total amount of nitrogen (N)-containing gas from the vinasse increases by 40.1%, while that from cow manure decreases by 14.1%. On the contrary, the total amount of sulfur (S)-containing groups in the syngas from vinasse drop by 22.0%, while that from cow manure increases by 9.1%. In addition, slight changes in the C-, N-, and S-containing gases are found from food waste. The results indicate that AD has a different effect on the N- and S- containing gaseous groups from different organic solid wastes, and the mechanisms deserve further investigation. The findings supply a theoretical foundation for environmental-friendly application of syngas from the digestates.
研究表明，厌氧消化（AD）对顺序热解的液体和固体产物性质有影响，但对气态产物的影响尚缺乏研究。本研究对三种原始有机固体废物及其相应消化产物（即食物垃圾、酒糟和牛粪）热解产生的合成气进行了研究。厌氧消化导致挥发性固体、固定碳、碳、氢和氮含量降低，硫含量增加。废物的失重主要发生在热解过程中的200 - 550℃，食物垃圾和酒糟的失重高于牛粪。在含碳（C）气体中，厌氧消化导致合成气中CH含量降低，这意味着消化产物的热值低于原始底物。厌氧消化后，酒糟中含氮（N）气体的总量增加了40.1%，而牛粪中含氮气体的总量减少了14.1%。相反，酒糟合成气中含硫（S）基团的总量下降了22.0%，而牛粪合成气中含硫基团的总量增加了9.1%。此外，食物垃圾产生的含碳、氮和硫气体有轻微变化。结果表明，厌氧消化对不同有机固体废物中含氮和含硫气态基团有不同影响，其作用机制值得进一步研究。这些发现为消化产物合成气的环境友好应用提供了理论基础。
