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알루미나시멘트와 생석회를 이용한 오염수 중의 음이온 침전 제거
Removal of Anoins by Precipitation using Alumina Cement and Lime from Polluted Water
HWAHAK KONGHAK, October 1999, 37(5), 746-751(6), NONE
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Abstract
회분식 반응이에서의 알루미나 시멘트와 생석회를 이용한 고농도 오염수에서의 질산엽과 다른 오염 음이온의 침전 제거에 관하여 살펴보았다. 알루미나 시멘트와 생석회를 질산염을 비롯한 여러 음이온 오염수에 첨가하면 소화된 알루미네이트 음이온 착화합물을 형성하여 침전시킴을 알 수 있다. 회분식 반응기에서 침전에 의한 음이온제거를 위한 최적조건을 살펴보았고 질산염 침전에 대한 다른 음이온의 효과를 알아보기 위해 질산염과 여러 음이온을 이용한 일련의 실험을 수행하였다. 이를 통해 질산염 제거속도와 제거율은 다른 음이온의 존재에 따라 영향을 받는다는 사실을 확인하였다. 침전반응후 수화된 알루미나 시멘트의 늑성은 주사전자현미경(scanning electron microscopy, SEM), 열질량분석법(thermogravimetric analysis, TGA) 및 X-선 회절분석법(X-ray diffractometry, XRD) 분석을 통해 살펴보았다. 후처리 공정으로 Na2CO3와 황산을 이용한 중화반응을 통하여 처리수 중 녹아있는 알루미나 및 칼슘 이온을 각각 제거할 수 있음을 확인하였다.
The Removals of nitrate and other undesirable anions by adding alumina cement and lime from highly polluted water with various anions were studied in a batch reactor. By adding alumina cement and lime to the anion polluted water, various anions including nitrate, sulphate, phosphate, and chloride were precipitated, formed to hydrates of anoin aluminate complex. The precipitation conditions of anoin removal in batch reactor was optimized. To determine the influence of specific anions in nitrate precipitation, a series of tests were performed with nitrate and various specific anions. As the result, the removal rate and yield of nitrate were found to be affected by the existence of other specific anion. After the precipitation reaction, the characteristics of hydrated alumina cement including specific anions were investigated by scanning electron microscopy, thermogravimetric analysis, and X-ray diffractometry. Post-treatments including sodium carbonate addition and neutralization with sulfuric acud alleviated the levels of aluminium and calcium ion concentrations dissolved in treated water.
Keywords
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Young JF, Cement Concrete Res., 2, 415 (1972)
Hvlica J. Roztocka D, Sahu S, Cement Concrete Res., 2, 294 (1992)
