Enhancing pollutant removal efficiency in urban domestic wastewater treatment through the hybrid multi-soil-layering (MSL) system: A case study in Morocco

Aya Kammoun, N. Ouazzani, Abdelhafid El Alaoui El Fels, A. Hejjaj, L. Mandi
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Abstract

This paper evaluates the performance and potential of a full-scale hybrid multi-soil-layering (MSL) system for the treatment of domestic wastewater for landscape irrigation reuse. The system integrates a solar septic tank and sequential vertical flow MSL and horizontal flow MSL components with alternating layers of gravel and soil-based material. It operates at a hydraulic loading rate of 250 L/m2/day. Results show significant removal of pollutants and pathogens, including total suspended solids (97%), chemical oxygen demand (COD) (88.57%), total phosphorus (TP) (79.93%), and total nitrogen (88.49%), along with significant reductions in fecal bacteria indicators (4.21 log for fecal coliform and 3.90 log for fecal streptococci) and the pathogen Staphylococcus sp. (2.43 log). The principal component analysis confirms the effectiveness of the system in reducing the concentrations of NH4, COD, TP, PO4, fecal coliforms, fecal streptococci, and fecal staphylococci, thus supporting the reliability of the study. This work highlights the promising potential of the hybrid MSL technology for the treatment of domestic wastewater, especially in arid regions such as North Africa and the Middle East, to support efforts to protect the environment and facilitate the reuse of wastewater for landscape irrigation and agriculture.
通过混合多土层(MSL)系统提高城市生活污水处理的污染物去除效率:摩洛哥案例研究
本文评估了用于处理景观灌溉回用的生活污水的全规模混合多土层(MSL)系统的性能和潜力。该系统集成了太阳能化粪池以及交替铺设砾石层和土壤层的连续垂直流 MSL 和水平流 MSL 组件。该系统的水力负荷率为 250 升/平方米/天。结果显示,污染物和病原体的去除率很高,包括总悬浮固体(97%)、化学需氧量(88.57%)、总磷(79.93%)和总氮(88.49%),同时粪便细菌指标(粪大肠菌群 4.21 log、粪链球菌 3.90 log)和病原体葡萄球菌(2.43 log)也明显减少。主成分分析证实了该系统在降低 NH4、COD、TP、PO4、粪大肠菌群、粪链球菌和粪葡萄球菌浓度方面的有效性,从而证明了研究的可靠性。这项工作凸显了混合 MSL 技术在处理生活废水方面的巨大潜力,尤其是在北非和中东等干旱地区,以支持保护环境和促进景观灌溉和农业废水回用的努力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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