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RISS 인기검색어
- 검색키워드
- 저자 : Lars Gillberg ) (검색결과 4 건)
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곽종운,Gillberg, Lars 한국수처리기술연구회 1995 한국수처리학회지 Vol.3 No.4
This study was accomplished to grasp the influences of coagulant basicity on P removal and alkalinity decrease in sewage water treatment with prepolymerized or monomerized Al-based coagulants. P removal efficiency resulted in the range of 80-96% using the coagulants with different basicities. Al-based coagulants with OH/Al ratios up to 1.8 were dosed to precipitate ortho-P and particles at the same time, while Al polymers with basicities of 2.1 were found to precipitate particles preferably. At higher doses, however, ortho-P was precipitated to an increasing degree. Total removal rate of P seemed to be remarkably influenced by thickness of the water. The coagulant with an OH/Al ratio of 1.1 was the most effective in precitating phosphorus from the thickest water, but in the thinnest water the coagulant with 1.9 was at its best. The alkalinity consumed strongly decreased with increasing basicity of the coagulant used. When the coagulant is dosed in an amount up to the threshold concentration, alkalinity depression was low, but if exceeded, alkalinity showed the significant decrease. Turbidity removal was more effective using the coagulant with OH/Al ratio of 2.1. The presence of Ca ions in sewage water was a positive effect for SS removal due to double layer depression, but they caused to increase the coagulant since Ca ions are favorable to react with P compounds.
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Influences of pH and Coagulant Basicity in Precipitating Orthophosphate by Al / Fe Salts
( Jong Woon Kwak,Lars Gillberg ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.1
본 연구에서는 철염/알루미늄 염이 조제수내에 들어있는 ortho-P 침전효과에 미치는 영향에 대하여 분석하였다. 응집제의 성능평가는 Jar test을 통하여 수행하였으며, 응집조제수는 Na₂HPO₄, 2H₂0 NaH₂PO₄ H₂O, and H₃PO₄를 사용하여 실험실적으로 제조하였다. 알칼리도조절은 NaHCO₃ 를 사용하여 조절하였다. Ortho-P의 제거효율은 용액의 pH뿐 아너라 사용한 금속염의 종류, 염기도에 의해서도 큰 영향을 받았다. 또한 응집제의 OH/Al(OH/Fe)비는 ortho-P의 제거반응에 상당한 영향을 미쳤으며, 비가 높을수록 ortho-P의 제거율은 감소하는 경향으로 나타났다. Ortho-P의 침전효과는 주어진 조건에서 pH에 따라 상당히 달라졌다. 본 실험에 따르면 ortho-P의 제거는 수산화 알루미늄보다는 초기 수화반응에서 생성된 알루미늄이온에 의하여 촉진되었다. pH가 높은 범위에서는 전반적으로 수산화알루미늄에 의해 제거되는 경향을 보여주었다. Ferrous sulfate경우 좁은 pH범위에서 ortho-P가 잘 제거되는 반면, aluminum 혹은 ferric 염은 보다 넓은 pH범위에서 ortho-P를 제거하였으나 pH=5이상에서는 제거율이 감소하였다. 또한 pH가 높은 범위에서 ortho-P의 제거율을 증가시키기 위해서는 초기교반강도를 증가시키는 것이 유리하였으며, 응집제의 염기도가 높을 때에도 유사한 경향을 보여 주었다. 특히 pH가 7.5이상인 범위에서 ferrous sulphate는 초기교반강도에 민감한 반응을 보였다. Non ortho-P나 SS는 응집제의 OH/Al비가 증가할수록 유리하였으며, 반면 ortho-P는 OH/Al 값이 낮을수록 제거율이 증가하였다. 이러한 반응은 서로 경쟁적으로 일어났으며 pH가 높을 수록 수화반응이 촉진되어 ortho-P의 제거율은 상대적으로 감소하나, 입자성 P의 제거는 상대적으로 유리하였다. The removal of ortho-phosphates(ortho-P) was conducted by several aluminum and iron salts at different pH on a laboratory scale. All experimental tests was conducted by jar tests. Three phosphorous compounds as the sources of ortho-P were used for the standard waters: Na₂HPO₄: 2H₂O, NaH₂PO₄, H₂O, and H₃PO₄. The molar ratio of Al/P (aluminum/phosphorus) in all doses was 1. The influence of pH on the removal of ortho-P was described when aluminum salts of different basicities, ferric and ferrous salts were added to solutions of ortho-P and in turn, when solutions of ortho-P to fresh hydroxides. More ortho-P was precipitated by the fresh hydrolysis products of the metal salts than by the metal hydroxides. Ferrous sulfate precipitated ortho-P in a narrow pH range, but aluminum and ferric salts precipitated ortho-P in a broad pH range. It was concluded that flashing mixing is critical to both high pH and low basicity of the coagulant in removing ortho-P. The removal of ortho-P by the ferrous salt was found to be more sensitive to the way of mixing than the other salts. In practice, removals of both non-ortho-P and suspended solid was enhanced with increasing coagulant basicity, but rather that of ortho-P was decreased.
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