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상수처리시 Fe (3) 응집제를 이용한 응집동력학에 관한 연구 : 수온과 황산이온의 영향
강임석(Lim Seok Kang),(John L . Cleasby) 한국수처리학회 1995 한국수처리학회지 Vol.3 No.2
The effects of low water temperature and sulfate ion on flocculation kinetics were examined using ferric nitrate as a coagulant to coagulate kaolin clay in water under tightly controlled treatment conditions. Both the particle size distribution data obtained from Automatic Image Analysis system and the on-line measurement of the degree of turbidity fluctuation in a flowing suspension by Photometric Dispersion Analyzer were used to measure flocculation kinetics. Results show that cold water temperature had a pronounced detrimental effect on flocculation kinetics. For improving flocculation kinetics at low temperature, maintaining constant pOH to adjust water chemistry for temperature changes was found to be partially effective, but only in the more acidic pH range studied (≤pH 6.8). However, the improved performance did not reach the performance at room temperature. In addition, sulfate ion added to kaolin suspension played an important role in the flocculation process, not only improving flocculation kinetics at more acidic pH levels but also changing surface charge of particles.