In this study, a pilot-scale down-flow hanging sponge (DHS) reactor was operated in the community plant of Bangkok for the treatment of domestic wastewater (COD 285 mg/L, BOD 105 mg/L) collected by separate sewer to evaluate the reactor’s feasibility as a decentralized treatment system. The DHS reactor was operated for 600 days at ambient temperatures of 25–30 °C, both with constant flow conditions and with fluctuating flow conditions that simulated wastewater discharge patterns of the community. The results indicate that under constant flow at an HRT of 5 h, the volumetric loading rates of 0.36 kgBOD/m³-sponge/day and 0.16 kgN/m³-sponge/day were the optimum operational conditions of the DHS reactor in order to satisfy the effluent discharge standards. The DHS achieved removal rates of 89, 95, 91 and 90% for COD, BOD, TSS and NH₄-N. Under the fluctuating flow condition, improvement of denitrification was confirmed at volumetric loading rates of 0.50 kgBOD/m³-sponge/day and 0.18 kgN/m³-sponge/day. The fluctuating flow of wastewater positively affects retained sludge activities in terms of homogenizing sludge concentration and stimulating oxygen uptake rates. These results suggest that the DHS reactor can be applied as a decentralized treatment system for domestic wastewater with fluctuating flow rates in tropical regions.

在这项研究中，在曼谷的社区工厂中运行了一个中试规模的下流式悬挂海绵（DHS）反应器，用于处理由单独的下水道收集的生活污水（COD 285 mg / L，BOD 105 mg / L），以评估反应堆作为分散处理系统的可行性。DHS反应器在25–30°C的环境温度下运行600天，流量条件恒定且流量条件波动，可模拟社区的废水排放模式。结果表明，在HRT为5 h的恒定流量下，体积负荷率为0.36 kgBOD / m ^3-海绵/天和0.16 kgN / m ³-海绵/天是DHS反应器的最佳运行条件，以满足废水排放标准。DHS对COD，BOD，TSS和NH ₄ -N的去除率分别为89％，95％，91％和90％。下波动流动状态，脱硝的改善在0.50 kgBOD /米的容积负荷率，确认³ -sponge /天和0.18 KGN /米³ -sponge /天。废水的波动对均匀化污泥浓度和刺激氧气吸收率有积极影响。这些结果表明，DHS反应器可以用作生活污水的分散处理系统，在热带地区流速波动较大。