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Effect of pH and Initial Phosphorus Concentration on Phosphorus Removal by Aluminum Salts

알루미늄염에 의한 인 제거 시 pH와 초기 인 농도의 영향

  • Received : 2015.10.07
  • Accepted : 2015.12.29
  • Published : 2016.04.15

Abstract

Phosphorus (P) removal by aluminum sulfate solution was investigated with varying pH and initial P concentrations. P removal was the highest at around pH 6. The pH range where P removal occurred was slightly wider at higher initial P concentrations. Compared to theoretical calculations, it was confirmed that $AlPO_4$ precipitation was the main reason for P removal at low pH. At high pH, where there should be no $AlPO_4$ precipitates, the P removal by adsorption of amorphous $Al(OH)_3$ precipitates was experimentally observed. The P removal by adding amorphous $Al(OH)_3$ precipitates prepared before the adsorption experiments, however, was lower than that by injecting aluminum sulfate solution because the prepared precipitates became larger, leading to less specific surface area available for adsorption. Ions other than sulfate had little influence on P removal.

Keywords

Adsorption;Aluminum salt;pH;Phosphorus;Precipitation

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Acknowledgement

Grant : 차세대 에코이노베이션사업(글로벌탑 환경기술개발사업)

Supported by : 환경부