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The most important nutrients in controlling water quality are: carbon, nitrogen and phosphorus. They are essential to the growth of all living organisms. These are the nutritional pillars of bacteria, fish, trees and humans. Unfortunately, when a water body or plan becomes rich in these nutrients, particularly phosphorus, this causes some organisms such as algae to grow in abundance which makes the environment ugly. These algae are usually undesirable and may inevitably cause changes in pH, dissolved oxygen, colour and turbidity of the water environment, hence the environment becomes eutrophic and its color turns to green. To address and solve the eutrophication issue, the amount of phosphorus discharged into the receiving milieu must be reduced; and this constitutes the main purpose of our research. We proceeded so as to make a physico-chemical phosphorus removal from urban waste water. The physico-chemical treatment is based on looking for and finding the optimal dose of the various added coagulants. The aim of our work is to confirm the efficiency of the chemical treatment through use: lime, ferric chloride and aluminum sulfate as coagulant for this treatment.

Phosphorus Removal of Urban Wastewater by Physico- Chemical Treatment: Waterways Euthrophication Prevention