In order to save utilized water

the blowdown water from circulating water system in some power plants is used as make-up water for chemical desalting water in said power plants after treatment.Seeing from deeds in operation

the effect of treatment by coagulation and clarification for said blowdown water isn't good.For this

starting with the antiscale and coagulating mechanism of said antiscalant and coagulant

the influence of phospherous antiscalant upon the coagulation effect has been analysed.On the basis of a large amount of carried out tests

a scheme of controlling the pH value of blowdown water through adding NaOH has been put forward

the coagulant is polyiron

the coagulant aid being polyacrylamide

so as to be beneficial to form the precipitation of CaCO3 and Mg(OH)2

reducing the dispersive effect of said antiscalant

increasing the turbidity of water and the density of vitriol flowers

improving the effect of coagulation and clarification.Through application of said scheme into second-phase project of Guohua Dingzhou Power Plant

good effectiveness of coagulation has been achieved.