| Chemical flocculation,among many methods of pollutants-removing in sewage,is characterized by a simply process ,a convenient operation,economical and effective. it can simplify the complex water-processing process by adding flocculant to the Sewage to remove the tiny suspended and colloid particles which are difficult to be precipitated by using the natural precipitation method. This experiment choose three kinds of usual used inorganic flocculants: Ferric chloride (FeCI3), vitriolic(A12(S04)3,Poly aluminum Chloride (PAC),and an organic polymer flocculant : polyacrylamide(PAM) to give a research on the deep-processing effect of this three kinds of flocculants on the sewage.through the experiment. Before the experiment turbidity,CODCr,TP,TN were: 156NTU,68.8,35.79,3.84.it determined the dose of the four kinds of flocculants,the optimal pH value and the optimum hydraulic condition.it also conducted a survey on the organic and inorganic flocculant's association。The results were as follows:when the flocculant working separately,the rate of the pollutants removal from high to low are PAC> AL2(SO4)3> FeCI3>PAM.it suggested that PAC had a good effects when its optimal dosage is 80mg/L, and the rates of removal of turbidity, Turbidity,CODCr, TN,TP were 80.29%,64.53%,60.92%,30.15% respectively. And the optimal pH value were AL2(SO4)3:pH =6;FeCL3: pH = 5;PAC pH = 8 respectively.From the results what we can see above we can conclude that FeCL3 can has an optimal Flocculation effect when it in the weak acidity condition,AL2(SO4)3 in the neutral,and PAC in the weak alkaline.(2).when the organic and inorganic flocculant,the rates of removal of pollutants from low to high are FeCL3+PAM≈AL2(SO4)3+PAM |
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