Laboratoire des Sciences et Techniques de l'Eau et de l'Environnement, Institut National de l'Eau, Université d'Abomey-Calavi, Abomey-Calavi, Bénin E-mail:
Institut National de la Recherche Scientifique (INRS Eau Terre et Environnement), Université du Québec, Québec, Canada.
Water Sci Technol. 2021 Mar;83(6):1499-1510. doi: 10.2166/wst.2021.073.
The present study aims to fill the data gap analysis in urban wastewaters characteristics in Benin and its statistical analysis. Physicochemical parameters such as pH, electrical conductivity (EC), Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD), Total Kjeldahl Nitrogen (TKN), Total Phosphorus (TP) and UV Absorbance at 254 nm, were determined on domestic (greywater and blackwater) and industrial (hospital, pharmaceutical and commercial laundry) wastewater in Cotonou city. Analysis of variance showed a strong significant difference in the physico-chemistry of the various effluents. The pharmaceutical wastewater has the highest concentration of organic pollution (COD = 5,912 ± 1,026 mg/L, Abs.UV254 = 2.667 ± 0.327 cm). The organic load of blackwater is mainly in particulate and biodegradable form. Besides, the correlation study showed the limits of pH and EC as an indicator of organic load. Furthermore, the choice of COD or BOD as the main design parameter would be limited to blackwater treatment. Abs.UV254 was found to be the parameter having a strong relationship with other parameters of all effluents except blackwater. It then takes priority over COD for the treatment of greywater and industrial wastewater. For future wastewater treatment plant design, we recommend to consider Abs.UV254 as an important parameter.
本研究旨在填补贝宁城市废水中理化特性及其统计分析方面的数据空白。在科托努市，对家庭（灰水和黑水）和工业（医院、制药和商业洗衣房）废水进行了 pH 值、电导率（EC）、化学需氧量（COD）、生化需氧量（BOD）、总凯氏氮（TKN）、总磷（TP）和 254nm 紫外吸光度等理化参数的测定。方差分析显示，各种废水的理化性质存在显著差异。制药废水的有机污染浓度最高（COD=5912±1026mg/L，Abs.UV254=2.667±0.327cm）。黑水的有机负荷主要以颗粒态和可生物降解的形式存在。此外，相关性研究表明，pH 值和 EC 可作为有机负荷的指标。此外，选择 COD 或 BOD 作为主要设计参数将仅限于黑水的处理。Abs.UV254 被发现与除黑水以外的所有废水的其他参数具有很强的关系。因此，它优先于 COD 用于处理灰水和工业废水。对于未来的废水处理厂设计，我们建议将 Abs.UV254 作为一个重要参数。
