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Search / Korean Journal of Chemical Engineering
HWAHAK KONGHAK,
Vol.30, No.2, 189-199, 1992
역확산에 의한 염료폐수의 효율적 처리
Application of Counter Diffusion to Effective Treatment of Dye-Wastes
백제석, 이정학, 저윤진
고농도의 염을 함유한 염료폐수의 생물학적 처리시 염의 농도가 미생물 성장에 미치는 영향과 막분리 기술을 도입한 새로운 처리공정의 개발을 연구하였다. 회분식 활성 슬러지법으로 각각의 염농도에 대해서 적응과정을 거치기 전후에 염의 충력부하를 가했을 때, 서로 다른 염농도에서 매생물의 성장을 반응시간에 따른 용존 COD 및 MLSS의 변화로 관찰하였다. 생물학적 처리의 전처리 공정으로서 역확산(counter diffusion)법을 도입하여 염료폐수에서 염만을 선택적으로 제거시키느 실험을 하였다. 운영조건에 따라 염 제거율은 1회 통과에 20-40%였고 분리계수는 1,200-2,300이었다. 탈거수에 손실된 염료의 농도는 0.2mg/l로서 2차 오염을 일으키지 않았다. 분리기능이 저하된 막을 재처리하였을 경우 분리계수가 향상되어 막의 재사용이 가능했다. 모델식으로부터 염과 염료의 막에 대한 물질전달계수(UM, NaCl, UM,dye)는 각각 9.4와2.1l/m2/hr였고 표면처리한 막이 염의 선택적 제거에 효율적임을 보여 주었다.
The effect of salt concentration on cell growth was investigated in biological treatment of dye-wastes with high salinity. Prior to or after the acclimation of activated sludge to various salt contents, the change of soluble COD and MLSS was observed with respect to the reaction time in different salt envi-ronments. Counter diffusion technology was introduced as a pretreatment process to reduce the salt contents of dye-wastes prior to the secondary activated sludge process. The salt removal was 20-40% with one path and the separation factor was 1,200-2,300. As the loss of dye molecules than 0.2mg/l, no secondary pollution problem occurred on the stripping water side. After re-immobilization of used membrane, the separa-tion factor was increased, on the contrary, compared with the first immobilized one. Membrane permeabilities for sodium chloride(UM.NaCl) and dye molecules(UM.dye) were found to be 9.4 and 2.1l/m2/hr, respectively.
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