Department of Civil and Environmental Engineering, Nagaoka University of Technology, Niigata 940-2188, Japan.
Business Department, Global Business Division, NJS Co., LTD., Tokyo 105-0023, Japan.
Bioresour Technol. 2024 Sep;408:131160. doi: 10.1016/j.biortech.2024.131160. Epub 2024 Jul 27.
A down-flow hanging sponge (DHS) reactor is a trickling filter system used for wastewater treatment, which employs sponges to retain biomass. This study assessed the process performance of a compact DHS combined with a sedimentation tank with seven phases at varying hydraulic retention times (HRT) over 500 days. The BOD of the DHS effluent was maintained at 4.0 ± 0.5 mg·L for the shortest HRT 0.3 ± 0.1 h. The nitrification efficiency was considerably impacted by the reduced HRT, with NH-N and NO-N concentrations of 9.0 ± 1.2 mgN·L and 2.2 ± 0.5 mgN·L, respectively. Nevertheless, the effluent complied with effluent discharge standards throughout the trial period. The number of comammox 16S rRNA gene copies ranged from 5.58 to 13.2 × 10 copies·mL, indicating that sponges biomass retained carrier can provide favorable conditions for comammox growth and could contribute to nitrification in the high-rate DHS reactor.
下向流悬挂式海绵（DHS）反应器是一种用于废水处理的滴滤滤池系统，采用海绵来保留生物量。本研究评估了紧凑 DHS 与沉淀槽结合使用的处理效果，在 500 多天的时间内，在不同水力停留时间（HRT）下进行了七个阶段的实验。在最短的 HRT 0.3±0.1 h 下，DHS 出水的 BOD 保持在 4.0±0.5 mg·L。硝化效率受到缩短 HRT 的显著影响，NH-N 和 NO-N 浓度分别为 9.0±1.2 mgN·L 和 2.2±0.5 mgN·L。然而，在整个试验期间，出水均符合排放标准。共氨氧化 16S rRNA 基因拷贝数范围为 5.58 到 13.2×10 拷贝·mL，表明海绵生物量保留载体可为共氨氧化生长提供有利条件，并有助于在高负荷 DHS 反应器中进行硝化。
