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The Performance of Pollutant Removal Using Nonpoint Treatment Filtration Device and Analysis of the Filter Backwashing Effect
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 Title & Authors
The Performance of Pollutant Removal Using Nonpoint Treatment Filtration Device and Analysis of the Filter Backwashing Effect
Lee, Jun-ho; Yang, Seung-ho; Bang, Ki-woong;
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 Abstract
Hydrocyclone is widely used in industry, for its simple design, high capacity, low maintenance and low operational cost. The objective of this study is to develop hydrocyclone coagulation and filtration system. The system is made of hydrocyclone ballasted coagulation with polyaluminium chloride silicate (PACS) and upflow filter to treat micro particles in urban storm runoff. Roadside sediment particles (< ) was mixed with tap water to make various turbid suspensions to simulate urban storm runoff. The filter cartridge was filled with polyethylene media system and ran 1hr per everyday and total operation time were 8.19hrs and backwashing everyday after end of operation. The operation condition of flowrate was (mean ) and surface overflow rate (SOR) based on filter surface area was (mean ). The range of PACS dosage concentration was 14.0~31.5 mg/L. As the results of operation, the range of removal efficiency of turbidity, SS were 81.0~95.8% (mean 89.5%) 81.8~99.0% (mean 91.4%), respectively. An increase of filtration basin retention time brought on increased of removal efficiency of turbidity and SS, and increase of SOR brought on decreased of removal efficiency. During the first flush in urban area, storm runoff have an high concentration of SS (200~600 mg/L) and the filtration bed becomes clogged and decreased of removal efficiency. Backwashing begins when the drainage pipe valve at the filtration tank bottom is completely open (backwashing stage 1). Backwashing stage 2 was using air bubbles and water jet washing the media for 5 mins and open the drainage valve. After backwashing stage 1, 2, 61.83~64.04%, 18.53~27.51% of SS loading was discharged from filtration tank, respectively. Discharged SS loading from effluent was 7.12~14.79% and the range of residual SS loading in fliter was 2.26~5.00%. The backwashing effects for turbidity, SS were 89.5%, 91.4%, respectively. The hydrocyclone coagulation and filtration with backwashing system, which came out to solve the problems of the costly exchange filter media, and low efficiency of removing micro particles of filter type nonpoint treatment devices, is considered as an alternative system.
 Keywords
Backwash;Coagulation;Hydrocyclone;Storm runoff;Upflow filtration;
 Language
Korean
 Cited by
1.
Adphos 여재의 인 흡착특성과 식생 매트와 결합한 여과실험에 의한 효율,김지아;주광진;최이송;장광현;오종민;

Ecology and Resilient Infrastructure, 2016. vol.3. 4, pp.231-237 crossref(new window)
2.
하이드로싸이클론 응집/응결, 여과장치를 조합한 상향류식 강우유출수 여과장치 처리성능 평가,양승호;이명진;권은미;이준호;

한국도시환경학회지, 2016. vol.16. 1, pp.23-34
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Phosphate Adsorption Characteristics of a Filter Medium, Adphos, and Its Efficiency by the Filtration Experiment Combined with the Vegetation Mat, Ecology and Resilient Infrastructure, 2016, 3, 4, 231  crossref(new windwow)
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