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DOI : ,    Vol.8, No.1, 9 ~ 19, 2000
A study on the characteristic properties of flocculation factors
정호진Ho Jin Chung,송수욱Soo Uook Song
This study analyses the characteristic properties which affect flocculation by measurement of residual turbidity using Jar-tester with industrial waste water which includes various hazardous materials. The followings are the optimum dosage of coagulant used: 299.7㎎/ℓ for aluminium sulphate, 64.9㎎/ℓ for ferric chloride, 25㎎/ℓ for PAC(Poly Aluminium Chloride) and 20㎎/ℓ for PAX(Poly Aluminium Chloride Silicate). In the case of the effect of each coagulant depending on pH, aluminium sulphate was the most effective at the alkali zone (i.e. pH 9∼12), ferric chloride was the neutral zone (i.e. pH 7∼9). PAC and PAX were less affected by pH, but well flocculated from the neutral zone (i.e. pH 6). The effect of water temperature has also been studied for the flocculation process. The difference of water temperature strongly affects on the flocculation process and the optimum temperature was normal temperature (20℃) for flocculation process. The structural properties of flocs was analysed by the observation of residual turbidity, and the volume and shape of the produced flocs. The floc structures of ferric chloride and PAC were comparatively denser and stronger than those of aluminium sulphate and PAX. The effect of flocculation of PAC and PAX was better than that of aluminium sulphate and ferric chloride. All these results could be applicable for basic reference to develop a new flocculation technique where the efficiency of flocculation has improved.
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