Please take a look at this useful RG link.

Article Methods for Removing of Phosphates from Wastewater

Through chemical precipitation by using coagulants

It is usually added in the form of lime Ca(OH)2. It reacts with the natural alkalinity in the wastewater to produce calcium carbonate, which is primarily responsible for enhancing SS removal.

Ca(HCO3)2 + Ca(OH)2 à 2CaCO3 ↓+ 2H2O

As the pH value of the wastewater increases beyond about 10, excess calcium ions will then react with the phosphate, to precipitate in hydroxylapatite:

10 Ca2+ + 6 PO43- + 2 OH- ↔ Ca10(PO4)*6(OH)2 ↓

Because the reaction is between the lime and the alkalinity of the wastewater, the quantity required will be, in general, independent of the amount of phosphate present. It will depend primarily on the alkalinity of the wastewater. The lime dose required can be approximated at 1.5 times the alkalinity as CaCO3. Neutralisation may be required to reduce pH before subsequent treatment or disposal. Recarbonation with carbon dioxide (CO2) is used to lower the pH value.

Read more: https://www.lenntech.com/phosphorous-removal.htm#ixzz6SoAlDwtx

Please also see the following RG links.

Article Technologies to Remove Phosphorus from Wastewater

Article Sorptive Removal of Phosphate From Wastewater Using Activated Red Mud

Article REMOVAL OF PHOSPHATE FROM WASTEWATER USING LOW-COST ADSORBENTS

Conference Paper Removal of Phosphate from wastewater using natural adsorbents

Phosphorous removal processes. The removal of phosphorous from wastewater involves the incorporation of phosphate into TSS and the subsequent removal from these solids. ... Chemical precipitation is used to remove the inorganic forms of phosphate by the addition of a coagulant and a mixing of wastewater and coagulant.

https://www.lenntech.com/phosphorous-removal.htm#:~:text=Phosphorous%20removal%20processes,subsequent%20removal%20from%20these%20solids.&text=Chemical%20precipitation%20is%20used%20to,mixing%20o

If you choose remove phosphate by biological treatment looking for less costs, you can use aerobic filters followed by anaerobic reactors. It have a high efficiency removal of nutrientes such nitrogen and phosphorus.

Please have a look at the following attached document.

Ok thank you so much Harasit Kumar Paul José Henrique Pastorelli Junior Anwar A. Abdulla @ Arvind Singh @ Jitesh Solanki Anwar A. Abdulla

Add calcium for precipitation, then filter.

In the case of waste water treatment, activated sludge may help you.

Mourad Amara Thanks a lot i will try it

CuSO4 solution, 1%

Hi Razika,

if very low effluent phosphate concentration are required (i.e. below

Dual media such as GEH and Activated carbon can be tried

By adding Alum and magnesium chloride salt. The reaction between Alum and phosphate leads to Aluminium phosphate. The reaction between Aluminium phosphate and magnesium chloride leads to magnesium phosphate and aluminium chloride.

This magnesium phosphate can be separated easily since it is heavy molecule. After that add a small quantity of sulphuric acid to it. Now phosphate is turned into phosphoric acid. And this goes into the atmosphere.