[논문]Effects of Polyelectrolyte Dosage, Kaoline Particles and pH on Flocculation of Humic Acid by Catonic Polyelectrolytes

Kam, Sang-Kyu; Kim, Dae-Kyoung; Lee, Min-Gyu

doi:10.5322/jes.2003.12.8.861

Effects of Polyelectrolyte Dosage, Kaoline Particles and pH on Flocculation of Humic Acid by Catonic Polyelectrolytes 원문보기

한국환경과학회지 = Journal of the environmental sciences, v.12 no.8, 2003년, pp.861 - 870

Kam, Sang-Kyu (Division of Civil and Environmental Engineering, Cheju National University) , Kim, Dae-Kyoung (Division of Civil and Environmental Engineering, Cheju National University) , Lee, Min-Gyu (Division of Chemical Engineering, Pukyong National University)

Abstract ▼ AI-Helper

Using a simple continuous optical technique, coupled with measurements of zeta potential, the effects of polyelectrolyte dosage, kaoline particles and pH on flocculation of humic acid by several cationic polyelectrolytes, have been examined. The charge density of a polyelectolyte is important in determining the optimum dosage and in the removal of humic acid. The optimum dosage is less for the polyelectrolytes of higher charge density and is the same regardless of the presence of kaoline particles of different turbidity. At the dosage, the removal of humic acid is higher for the polyelectrolytes of higher charge density and the zeta potential of humic acid approaches to near zero, With increasing pH of humic acid, the optimum dosage increases and the flocculation index value obtained at the dosage decreases in the following pH 7 ＞ pH 5 ＞ pH 9, regardless of polyelectrolytes.

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제안 방법

Flocculation tests were carried out in a 300 mL Pyrex beaker with 200 mL of humic acid solutions at a concentration of 25 mg/L containing different kaoiline suspensions (0, 15, 35 and 55 NTU), which were placed into a water bath to maintain a constant temperature (20 ℃). In these cases, the humic acid solutie nsNwere adjusted to pH 5, 7 and 9 with 0.
of polyelectrolyte dosing. The results obtained from this study may provide an usefill information on flocculation characteristics between humic acid and cationic polyelectrolytes.

이론/모형

Flocculation monitor is a Photometric Dispersion Analyzer (PDA 2000, Rank Brothers, Cambridge, UK), the principles of which have been given by Gregory and Nelson.꺼 Basically, the intensity of narrow beam of light transmitted through a flowing suspension is monitored by a photodetector, the output of which consists of a steady (de) component and a much smaller fluctuating (ac) component (The ac component arises from randon variations in the number of particles in the suspensions and the fact that the sample is continuously being renewed by flow.

참고문헌 (21)

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원문보기 상세보기
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Effects of Polyelectrolyte Dosage, Kaoline Particles and pH on Flocculation of Humic Acid by Catonic Polyelectrolytes 원문보기

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Effects of Polyelectrolyte Dosage, Kaoline Particles and pH on Flocculation of Humic Acid by Catonic Polyelectrolytes 원문보기

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