earticle

영어

This research work aims at highlighting the importance of wastewater treatment generally and removing phosphorus from these waters specifically, in order to preserve our environment. Reducing the rejected quantity of phosphorus, nutrient element, in the receiving environments, enables the restriction of the phenomenon of water streams eutrophication. This is the primary objective of our research. Both the chemical and biological treatments are recognized as effective for phosphorus removal from waste water. In our study, we worked on phosphorus removal from urban wastewater through three treatments types: chemical, biological, and a combined one. The findings of the chemical treatment demonstrated a good treatment efficiency of the organic matter: 95% of DCO and 88% of phosphorus; as per the biological treatment: 60% of DCO and 49% of phosphorus were found. A further treatment has been conducted through combining the first couple of treatments. This combination method seeks to find the optimal dose of the different conventional coagulants namely lime, ferric chloride and aluminum sulfate .The combined treatment resulted in a better phosphorus removal efficiency: 83% of phosphorus and 96% of DCO. The obtained results proved to be highly encouraging and incite the responsible / heads of STEP to adapt and apply this type of treatment which revealed to be an appropriate purification technique of wastewater.