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정수처리장에서 직분사 용존공기부상조와 맥동식 침전지의 Chl-a 제거특성 비교 연구
김정웅 ( Jeong-woong Kim ),최영익 ( Young-ik Choi ),정진희 ( Jin-hee Jung ),권민지 ( Min-ji Keon ),김한석 ( Han-seok Kim ),장성호 ( Seong-ho Jang ),정병길 ( Byung-gil Jung ) 한국환경기술학회 2022 한국환경기술학회지 Vol.23 No.6
This research was to compare the Chl-a removal characteristics of a direct-spraying dissolved air flotation(DAF) tank and a pulsator clarifier in water treatment plant. Alum(Aluminum sulfate) and PAC were used. The Chl-a removal efficiency during the operation of the direct-spraying DAF tank and the pulsator clarifier in the summer when algae is frequently generated were 68.3(25.0∼91.3) % and 39.1(9.1∼71.9) %, respectively. It was found that the direct-spraying DAF process is more effective than the pulsator clarifier in removing algae. In the case of the direct-spraying DAF tank, the correlation coefficient (R2) showed a high correlation of 0.8821 at Chl-a concentration below 20.0 mg/m<sup>3</sup>. Also, The change in removal efficiency was not significant at Chl-a concentrations above 20.0 mg/m<sup>3</sup>. In particular, the removal efficiency was less than 50 % at a Chl-a concentration below 8 mg/m3. Therefore, the direct-spraying DAF tank was more effective in removing algae than the pulsator clarifier, as it showed higher removal efficiency not only during the algal bloom period but also in the low Chl-a concentration. In terms of the economic feasibility of the direct-spraying DAF process, it is evaluated that the unit price of this algae removal technology is 21.47 won/m<sup>3</sup>.
직분사 DAF 공정을 이용한 정수장 유입 원수의 탁도 및 SS 제거특성
김정웅 ( Jeong-woong Kim ),정병길 ( Byung-gil Jung ),권민지 ( Min-ji Keon ),정진희 ( Jin-hee Jung ),최영익 ( Young-ik Choi ) 한국환경기술학회 2022 한국환경기술학회지 Vol.23 No.4
This research examines the installation and operation of a direct-spraying dissolved air flotation process to remove turbidity and SS (Suspended solids) in the pulsator clarifier of A water treatment plant in B city. To evaluate the performance of the direct-spraying DAF (Dissolved Air Flotation) process, experiments were conducted with raw water before chemical input. As polymer coagulants, Alum (Aluminum sulfate) and PAC (Poly aluminum chloride) are selected in this research, as these are the most widely used in water treatment processes. Installation scales on the site are 50,000 m<sup>3</sup>/d of water treatment capacity of the direct-spraying DAF process, and 10,000 m<sup>3</sup>/d of the wastewater treatment process. For raw water before PAC is added, turbidity and SS removal efficiency of the direct-spraying DAF process at several PAC concentrations (8 mg/L, 15 mg/L, 20 mg/L and 30 mg/L, respectively) are highest at the PAC concentration of 20 mg/L. In particular, during the trial run, the mean turbidity removal efficiency was 91.0 % at the optimum PAC concentration of 20 mg/L in raw water before chemical input.