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아크릴폐수를 광촉매로 전처리하여 막오염인자를 최소화한 후 막조합공정에 적용하였다. 한외여과막과 정밀여과막을 역삼투막과 조합을 이루어 막조합공정을 구성하였으며 광촉매처리수를 온도 및 압력변화에 따라 막조합공정에 적용하여 분리특성을 확인하였다. 정밀여과막 모듈 혹은 한외여과막 모듈의 투과수는 역삼투모듈로 보내지며 역삼투 모듈의 최종적인 투과량은 모듈 set 2 (MWCO 200,000 UF+RO)의 역삼투 모듈이 우수하였다. UF 및 MF 모듈에서 TDS, T-N 및 COD의 제거효율은 온도 및 압력변화에 영향을 받지 않고 제거효율 또한 낮음을 알 수 있었다. 그러한 결과로 RO 모듈에서 TDS, T-N 및 COD가 우수한 제거효율을 보였다. UF 및 MF모듈에서의 탁도 제거효율은 우수한 경향(제거효율 99% 이상)을 보였다. 막조합공정에서 처리된 광촉매처리수는 배출 허용기준치를 충족하고, 재활용이 가능하였다.
After membrane fouling factors in acrylic wastewater were minimized by pretreatment process accompanied with TiO2, it was utilized in MF/UF/RO process. After composing of ultrafiltration/reverse osmosis or microfiltration/reverseosmosiss module set according to types and kinds of membrane, the separation characteristics were examined with the variation temperature and pressure using pretreated acrylic wastewater by membrane module sets. The permeate of ultrafiltration or microfiltration module was sent to reverse osmosis module. It was found that final permeate flux of reverse osmosis module in module set 2 (MWCO 200,000 UF+RO) was excellent. It was shown that the removal efficiency of TDS, T-N and COD was very low and was not dependent on the variation of temperature and pressure in UF and MF modules. From the above result, the removal efficiency of TDS, T-N and COD was very excellent in RO module. The removal efficiency of turbidity in UF and MF module was very high (> 99% removal efficiency). Final water quality of acrylic wastewater treated by the membrane module set was satisfied with effluent allowances limit and membrane module sets were ascertained to reuse wastewater.
