College of Engineering, China Agricultural University, Beijing 100083, China; R&D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development and Reform Committee (BGFeuls), Beijing 100083, China.
Swedish Centre for Resource Recovery, University of Borås, Borås, Sweden.
Bioresour Technol. 2020 Aug;310:123470. doi: 10.1016/j.biortech.2020.123470. Epub 2020 May 1.
The slow hydrolysis rate and ammonia inhibition effects significantly limit the performance of anaerobic digestion (AD) of nitrogen rich wastes. An innovative two-stage AD was therefore investigated for chicken manure by combining hyper-thermophilic (70 °C) pretreatment and a anaerobic membrane bioreactor (AnMBR). An in-situ stripping unit was assembled into the AnMBR to remove the ammonium-N, thus alleviating the inhibition effects. Through the 120-day experiment, the hydraulic retention time was optimized at 15 days for AnMBR with a constant retention 4 days for pretreatment. The hydrolysis efficiency and methane yield reached 72.4% and 352 mL-CH/g-VS respectively. About 3000 mg/L ammonium-N was removed through stripping, attributing to methane yield increased by 139 mL-CH/g-VS and volatile fatty acids decreased by 2683 mg/L compared to the control. No significant fouling was observed for the membrane. Conclusively, the combined two-stage AD process may offer an alternative approach for the treatment of nitrogen rich organic waste.
富含氮的废物在进行厌氧消化（AD）时，由于水解速度缓慢和氨抑制作用，其性能受到显著限制。因此，通过将超嗜热（70°C）预处理与厌氧膜生物反应器（AnMBR）相结合，研究了一种用于鸡粪的创新两段式 AD。在 AnMBR 中组装了一个原位汽提单元以去除氨氮，从而减轻抑制作用。通过 120 天的实验，水力停留时间优化为 AnMBR 为 15 天，预处理的恒定停留时间为 4 天。水解效率和甲烷产量分别达到 72.4%和 352 mL-CH/g-VS。通过汽提去除了约 3000 mg/L 的氨氮，与对照相比，甲烷产量增加了 139 mL-CH/g-VS，挥发性脂肪酸减少了 2683 mg/L。膜没有出现明显的结垢。总之，组合的两段式 AD 工艺可能为处理富含氮的有机废物提供了一种替代方法。
