Critical analysis by comparison between water quality models applied to polluted rivers: Contributions to health, water and sanitation

ABSTRACT The focus of this article is to analyze the presence of organic matter in sewage from BOD-DO models. The model relates to the pollution of a water body by organic matter and the decrease in dissolved oxygen levels caused by the respiration of microorganisms involved in sewage purification. It is highlighted the modeling of different types of pollutant loading release, presenting four types of them, and the effects on the natural water bodies’ self-purification, from two patterns of transport provided by the receiving body; first for a smaller flow and then there is a flow increase. This work also discusses how mathematical models can intervene effectively in the discharge of sewage after treatment and if these can contribute to public health, sanitation and improved conservation of water resources.

摘要 本研究聚焦于基于生化需氧量-溶解氧（BOD-DO）模型分析污水中有机物的赋存特征。该模型用于阐释水体受有机物污染的过程，以及污水净化过程中相关微生物呼吸作用所引发的溶解氧水平下降现象。研究重点阐述了四类不同污染物负荷排放的建模流程，并基于受纳水体的两种输运模式（先为小流量工况，后为流量增大工况），分析了其对自然水体自净能力的影响。本研究同时探讨了数学模型如何有效管控处理后污水的排放环节，以及此类模型能否助力提升公共卫生水平、改善环境卫生状况并优化水资源保护工作。