Green Processing Unit, Sustainable Design, Scion, Private Bag 3020, Rotorua 3046, New Zealand.
Waste Manag. 2012 Sep;32(9):1669-77. doi: 10.1016/j.wasman.2012.04.004. Epub 2012 May 19.
In this study four diverse solid waste substrates (coal, Kraft pulp solids, chicken feathers and chicken processing waste) were thermally pre-treated (70, 140 and 200 °C), under an inert (nitrogen) or oxidative (oxygen) atmosphere, and then anaerobically digested. Membrane inlet mass spectrometry during the thermal and thermo-chemical reactions was successfully used to establish oxygen and carbon dioxide gas fluxes and product formation (acetic acid). There was significant solids hydrolysis pre-treatment at 200 °C under an oxidative atmosphere, as indicated by a decrease in the volatile suspended solids and an increase in dissolved organic carbon. Greater concentrations of volatile fatty acids were produced under oxidative conditions at higher temperatures. The methane yield more than tripled for feathers after pre-treatment at 140 °C (under both atmospheres), but decreased after oxidative pre-treatment at 200 °C, due to the destruction of available carbon by the thermo-chemical reaction. Methane yield more than doubled for the Kraft pulp solids with the 200 °C pre-treatment under oxidative conditions. This study illustrated the power of wet oxidation for solids destruction and its potential to improve methane yields generated during anaerobic digestion.
在这项研究中，四种不同的固体废物基质（煤、牛皮纸浆固体、鸡毛和鸡肉加工废物）在惰性（氮气）或氧化性（氧气）气氛下分别进行了 70°C、140°C 和 200°C 的热预处理，然后进行厌氧消化。在热和热化学反应过程中，成功地使用膜入口质谱法来建立氧气和二氧化碳气流以及产物形成（乙酸）。在氧化性气氛下，200°C 下的固体水解预处理非常显著，挥发性悬浮固体减少，溶解有机碳增加。在较高温度下的氧化性条件下，产生了更高浓度的挥发性脂肪酸。羽毛在 140°C 下进行预处理（在两种气氛下）后，甲烷产量增加了两倍以上，但在 200°C 下进行氧化性预处理后，甲烷产量下降，因为热化学反应破坏了可用的碳。牛皮纸浆固体在 200°C 下进行氧化性预处理后，甲烷产量增加了一倍以上。这项研究说明了湿式氧化在固体破坏方面的威力及其在提高厌氧消化过程中产生的甲烷产量方面的潜力。
