Laboratory of Applied Chemistry, Unity of Methodology and Environment, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco.
Institute of Urban Water Management and Environmental Engineering, Ruhr-Universität Bochum, Bochum, Germany.
Environ Technol. 2020 Aug;41(20):2657-2669. doi: 10.1080/09593330.2019.1578830. Epub 2019 Feb 17.
In the present study, the treatability of olive mill wastewater (OMWW) using an anaerobic fixed bed biofilm reactor packed with granular activated carbon (GAC) and inoculated with non-acclimated biomass was performed in a semi-continuous mode under mesophilic conditions. Three organic loading rates (OLR) varied from 0.94 to 2.81 g COD/(L d) were applied. The results of batch adsorption tests on GAC and the experimental data from PBBR-GAC operation were used to set up a COD mass balance in order to investigate the effect of adsorption on the COD removal during the three anaerobic treatment steps. Despite the slight accumulation of volatile fatty acids (VFAs) during the second and the third steps, between 735 and 1135 mg COD/L (as acetic acid), a stable environment for methanogens was maintained for a period of 104 days. During the three steps, degradation levels were up to 80% of COD and 85% of phenolic compounds. An averaged specific biogas production of 1.77 L/d and a methane (CH) concentration of about 60%, corresponding to a CH yield of 0.31 L CH/g COD, were reached at an OLR of 2.81 g COD/(L d). The results show that the COD mass balance was not closed during the first two steps, while in the third step, it could be around 96%. This finding suggests that the adsorption of organic substances on activated carbon occur just during the two first steps, while at 2.81 g COD/(L d) OLR no adsorption is occurring and the introduced COD becomes completely available for CH production.
在本研究中，采用厌氧固定床生物膜反应器（填充颗粒活性炭（GAC）并接种非驯化生物量），在中温条件下以半连续模式处理橄榄磨废水（OMWW）。应用了三个有机负荷率（OLR），范围从 0.94 到 2.81 g COD/（L d）。使用 GAC 的批量吸附试验结果和 PBBR-GAC 运行的实验数据建立了 COD 质量平衡，以研究吸附对三个厌氧处理步骤中 COD 去除的影响。尽管在第二和第三步中挥发性脂肪酸（VFAs）略有积累，但在 104 天的时间内，仍为产甲烷菌维持了一个稳定的环境，其乙酸含量为 735 至 1135 mg COD/L。在这三个步骤中，COD 的降解水平高达 80%，酚类化合物的降解水平高达 85%。在 OLR 为 2.81 g COD/（L d）时，达到了平均特定沼气产量为 1.77 L/d 和甲烷（CH）浓度约为 60%，对应于 0.31 L CH/g COD 的 CH 产率。结果表明，在前两个步骤中 COD 质量平衡未封闭，而在第三个步骤中，其可以达到约 96%。这一发现表明，有机物质在活性炭上的吸附仅发生在前两个步骤中，而在 2.81 g COD/（L d）OLR 下，没有发生吸附，引入的 COD 完全可用于 CH 生产。
