Department of Civil & Environmental Engineering, Hanyang University, 55 Hanyangdaehak-ro, Ansan City, Gyeonggi-do, 426-791, Republic of Korea.
Plant Engineering Center, Institute for Advanced Engineering, 51 Goan-ro, Yongin City, Gyeonggi-do, 175-28, Republic of Korea.
J Environ Manage. 2019 Nov 1;249:109397. doi: 10.1016/j.jenvman.2019.109397. Epub 2019 Aug 20.
In this study, the optimum conditions of thermal-alkali pre-treatment and the performance of ammonia stripping were investigated for improving solubilization efficiency and methane yield in the anaerobic co-digestion of food waste (FW) and sewage sludge (SS). The reaction temperature, NaOH concentration and reaction time for the thermal-alkali pre-treatment were investigated to determine optimum pre-treatment conditions. Solubilization rate, volatile suspended solids (VSS) reduction rate and total volatile fatty acid (VFAs) yields were improved with increasing reaction temperature, NaOH concentration and reaction time. In addition, by applying the optimum pre-treatment conditions (140 °C, 60 meq/L and 60 min), the experimental methane yield of thermal-alkali pre-treatment of a mixture of FW and SS was 483.0 ± 15.7 mL CH/g VS, which was about 84% higher than that of the untreated one. However, after thermal-alkali pre-treatment, the NH concentration of the thermal-alkali pre-treatment liquid showed a concentration that could inhibit anaerobic digestion, so ammonia stripping was performed to remove NH. As a result, the experimental methane yield was increased by about 7% compared to when ammonia stripping was not performed.
在这项研究中，研究了热碱预处理的最佳条件和氨汽提的性能，以提高食品废物（FW）和污水污泥（SS）厌氧共消化中的溶解效率和甲烷产量。研究了热碱预处理的反应温度、NaOH 浓度和反应时间，以确定最佳预处理条件。随着反应温度、NaOH 浓度和反应时间的增加，溶解率、挥发性悬浮固体（VSS）减少率和总挥发性脂肪酸（VFAs）产量均得到提高。此外，通过应用最佳预处理条件（140°C、60 meq/L 和 60 min），FW 和 SS 混合物的热碱预处理的实验甲烷产率为 483.0±15.7 mL CH/g VS，约比未处理的高 84%。然而，热碱预处理后，热碱预处理液中的 NH 浓度表现出抑制厌氧消化的浓度，因此进行了氨汽提以去除 NH。结果表明，与不进行氨汽提相比，实验甲烷产量增加了约 7%。
