Technical Research & Development Division, Sanki Engineering Co., Ltd., 1742-7 Shimotsuruma, Yamato, Kanagawa 242-0001, Japan.
Water Sci Technol. 2012;66(6):1186-94. doi: 10.2166/wst.2012.297.
An up-flow anaerobic sludge blanket (UASB) - down-flow hanging sponge (DHS) was applied to Japanese municipal sewage treatment, and its treatability, energy consumption, and sludge production were evaluated. The designed sewage load was 50 m(3)/d. The sewage typically had a chemical oxygen demand (COD) of 402 mg/L, a suspended solids (SS) content of 167 mg/L, and a temperature of 17-29 °C. The UASB and DHS exhibited theoretical hydraulic retention times of 9.7 and 2.5 h, respectively. The entire system was operated without temperature control. Operation was started with mesophilic anaerobic digested sludge for the UASB and various sponge media for the DHS. Continuous operational data suggest that although the cellulose decomposition and methanogenic process in the UASB are temperature sensitive, stable operation can be obtained by maintaining a satisfactory sludge volume index and sludge concentration. For the DHS, the cube-type medium G3-2 offers superior filling rates, biological preservation and operational execution. The SS derived from the DHS contaminated the effluent but could be removed by optional sand filtration. A comparison with conventional activated sludge (CAS) treatment confirmed that this system is adequate for municipal sewage treatment, with an estimated energy requirement and excess sludge production approximately 75 and 85% less than those of CAS, respectively.
上流式厌氧污泥床（UASB）-下流式悬挂式海绵（DHS）被应用于日本城市污水处理，评估了其处理能力、能耗和污泥产量。设计的污水负荷为 50 m³/d。污水的化学需氧量（COD）通常为 402 mg/L，悬浮物（SS）含量为 167 mg/L，温度为 17-29°C。UASB 和 DHS 的理论水力停留时间分别为 9.7 和 2.5 h。整个系统在没有温度控制的情况下运行。UASB 使用中温厌氧消化污泥启动，DHS 使用各种海绵介质启动。连续运行数据表明，尽管 UASB 中的纤维素分解和产甲烷过程对温度敏感，但通过维持令人满意的污泥体积指数和污泥浓度，可以获得稳定的运行。对于 DHS，G3-2 型立方体型介质具有较高的填充率、生物保存和操作执行能力。DHS 产生的 SS 污染了出水，但可以通过可选的砂滤去除。与传统活性污泥（CAS）处理的比较证实，该系统适用于城市污水处理，估计能源需求和剩余污泥产量分别比 CAS 低约 75%和 85%。
