Process for dephosphatation of sewage waters

The invention relates to processes for dephosphatation of sewage waters, particularly sewage waters formed at the livestock farms. The process, according to the invention, includes treatment of waters with a coagulating-precipitating agent, the coagulation-precipitation of phosphates and their separation by filtration, at the same time as coagulating-precipitating agent is used sugar production defecate, taken in a ratio of the calcium content recalculated in respect of the phosphor content in the sewage waters of (5...7):1. Inventia se refera la procedeele de defosfatare a apelor uzate, in particular a apelor uzate provenite de la crescatoriile de animale. Procedeul, conform inventiei, include tratarea apelor cu un agent de coagulare-precipitare, coagularea-precipitarea fosfatilor si separarea lor prin filtrare, totodata in calitate de agent de coagulare-precipitare se utilizeaza defecat de la producerea zaharului, luat intr-un raport al continutului de calciu recalculat fata de continutul de fosfor din apele uzate de (5...7):1.