Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Dept. of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai 980-8579, Japan.
Dept. of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai 980-8579, Japan; Graduate School of Environmental Studies, Tohoku University, Sendai 980-8579, Japan.
Bioresour Technol. 2015 Jun;185:308-15. doi: 10.1016/j.biortech.2015.03.019. Epub 2015 Mar 10.
This study was conducted to investigate the effects of sulfate on propionate degradation and higher organic loading rate (OLR) achievement in a thermophilic AnMBR for 373days using coffee grounds, milk and waste activated sludge (WAS) as the co-substrate. Without the addition of sulfate, the anaerobic system failed at an OLR of 14.6g-COD/L/d, with propionate accumulating to above 2.23g-COD/L, and recovery by an alkalinity supplement was not successful. After sulfate was added into substrates at a COD/SO4(2-) ratio of 200:1 to 350:1, biogas production increased proportionally with OLR increasing from 4.06 to 15.2g-COD/L/d. Propionic acid was maintained at less than 100mg-COD/L due to the effective conversion of propionic acid to methane after the sulfate supplement was added. The long-term stable performance of the AnMBR indicated that adding sulfate was beneficial for the degradation of propionate and achieving a higher OLR under the thermophilic condition.
本研究旨在探究硫酸盐对嗜热 AnMBR 中丙酸降解和更高有机负荷率（OLR）实现的影响。该 AnMBR 以咖啡渣、牛奶和废活性污泥（WAS）为共基质，在 373 天的时间里进行了实验。在不添加硫酸盐的情况下，厌氧系统在 OLR 为 14.6g-COD/L/d 时失效，丙酸积累到 2.23g-COD/L 以上，通过补充碱度的方法也未能使其恢复。当 COD/SO4(2-) 比值为 200:1 至 350:1 时，硫酸盐被添加到基质中，沼气产量随着 OLR 从 4.06g-COD/L/d 增加到 15.2g-COD/L/d 而呈比例增加。由于硫酸盐添加后丙酸被有效地转化为甲烷，丙酸的浓度一直保持在 100mg-COD/L 以下。AnMBR 的长期稳定性能表明，在嗜热条件下，添加硫酸盐有利于丙酸的降解和实现更高的 OLR。
