In this study, the effect of salinity on the removal of organic matter and nitrogen concentrations in bioreactor was investigated using a hybrid bench scale down-flow hanging sponge (DHS) system for 145 days of operation. The reactor had three identical sections that were filled to 30% volume with Bio-Bact to serve as attached media. The DHS reactor was fed with domestic wastewater that was mixed with increasing concentration of sodium chloride from 0.5 to 3.0% stepwise. The influent and effluent concentrations of BOD₅, COD_Cr, NH₄⁺-N, and TN were analyzed to evaluate the performance of the DHS reactor during the operational period. Results indicate that when salinity was increased from 0.5 to 3.0%, the removal efficiency gradually decreased from 80.3% to 61.5% for COD_Cr, 76.4%–65.0% for BOD₅, 64.1%–48.4% for NH₄⁺-N, and 50%–36% for TN. Besides, the changes in biofilm characteristics with increasing salinity were observed during the operational period. The results indicate that salinity has a significant influence on the removal of organic matters and nitrogen transformation in the biofilm of the bioreactor. Even so, the DHS reactor revealed a good potential for treating saline wastewater.

在这项研究中，使用混合型下流式悬挂海绵 (DHS) 系统运行 145 天，研究了盐度对生物反应器中有机物去除和氮浓度的影响。反应器具有三个相同的部分，用 Bio-Bact 填充至 30% 的体积作为附着介质。向 DHS 反应器输送生活废水，该废水与逐步增加的氯化钠浓度从 0.5% 到 3.0% 混合。进出水BOD ₅、COD _Cr、NH ₄ ⁺浓度-N 和 TN 被分析以评估 DHS 反应器在运行期间的性能。结果表明，当盐度从 0.5% 增加到 3.0% 时，COD _Cr的去除效率逐渐从 80.3% 下降到 61.5 %，BOD ₅的去除效率从 80.3% 下降到65.0%，NH ₄ ⁺ -N的去除率从64.1%–48.4% 下降到TN 为 50%–36%。此外，在运行期间观察到生物膜特性随着盐度的增加而变化。结果表明，盐度对生物反应器生物膜中有机物的去除和氮的转化有显着影响。即便如此，DHS 反应器仍显示出处理含盐废水的良好潜力。