Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan.
Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572, Japan.
Environ Sci Pollut Res Int. 2020 May;27(15):17587-17595. doi: 10.1007/s11356-019-06651-4. Epub 2019 Oct 31.
In this study, an integrated system of siphon-driven self-agitated anaerobic reactor (SDSAR) and anaerobic fixed bed reactor (AFBR) was conducted for the treatment of wastewater from food waste disposer (FWD), and the effect of influent total solids (TS) concentration on the process performance was evaluated. When the influent TS concentration increased from 7.04 to 15.5 g/L, the methane gas production rate increased from 0.45 to 0.92 L-CH/L/day. However, with the influent TS concentration of food waste (FW) further increased to 23.5 g/L, a large amount of scum formed and accumulated in the SDSAR. According to the result of chemical oxygen demand (COD) recovery, the proportion of COD remained in the effluent at different TS concentrations was only around 2%. On the other hand, with an increase in TS concentration, the proportion of COD remained in the reactors increased significantly. Our results demonstrated that effluent from the integrated system can meet the water quality requirements recommended by Japan Sewage Works Association (JSWA) for wastewater from FWD. In addition, to enhance the process stability, the influent TS concentration should be maintained below 15.5 g/L.
在这项研究中，采用虹吸驱动自搅拌厌氧反应器（SDSAR）和厌氧固定床反应器（AFBR）集成系统处理食物垃圾处理器（FWD）废水，并评估了进水总固体（TS）浓度对工艺性能的影响。当进水 TS 浓度从 7.04 增加到 15.5 g/L 时，甲烷气体产率从 0.45 增加到 0.92 L-CH/L/天。然而，当进水食物垃圾（FW）TS 浓度进一步增加到 23.5 g/L 时，大量的浮渣在 SDSAR 中形成并积累。根据化学需氧量（COD）回收率的结果，在不同 TS 浓度下，废水中残留的 COD 比例仅约为 2%。另一方面，随着 TS 浓度的增加，废水中残留的 COD 比例显著增加。研究结果表明，集成系统的出水可以满足日本污水厂协会（JSWA）推荐的 FWD 废水水质要求。此外，为了提高工艺稳定性，进水 TS 浓度应保持在 15.5 g/L 以下。
