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강준원,김종배 ( Joon Wun Kang,Jong Bae Kim ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.2
상수원수의 생분해도를 평가하는 방법으로 AOC(동화가능유기탄소)방법을 사용하여 보았다. van der Kooij가 제시하였던 기존의 AOC방법은 P17, NOX의 특정균주를 사용하였으며 본 연구에서는 낙도강수의 오존처리수에서 분리한 Acinetobacter calcoaceticus균주로 부터 AOC 측정 방법을 제시하였다. 본 실험에서 분리동정한 이 균주는 오존처리수에서 분리되는 세균의 대표적인 것이었으나, 오존처리를 하지않은 원수에서는 전혀분리되지 않았다. 분리균주의 생물활성도를 평가하기 위하여 sodium acetate와 oxalate를 영양원으로하여 탄소원의 농도 대비 세균증식수의 상관관계를 고찰한 결과 기존의 Pl7, NOX균주와 유사한 Yield Coefficient값을 관찰할 수 있었다. 이 균주를 사용한 AOC측정 방법의 가장 큰 장점은 세균의 증식속도가 Pl7, 또는 NOX에 비하여 매우 빠르기 때문에 AOC측정에 소요되는 배양시간을 단축할 수 있는 큰 잇점이 있다. 실증 Plant실험결과, AOC농도가 오존처리한 후 증가되었으며 염소소독 후에도 감소하지 않았다 이와같은 조건에서, 후-오존처리리공정후에 AOC의 농도를 줄일 수 있는 생물활성탄과같은 후처리공정을 설치하는것이 바람직 하다고 본다. The effect of ozone application in the drinking water on the production of assimilable organic carbon (AOC) was evaluated. The typical procedure to determine AOC is suggested by van der Kooij, which is the method of bacterial growth measurement by colony forming units using the strain P17 and/or NOX. The bacterial indicator species used for this study is Acinetobncter calcoaceticus which was isolated and identified ozonating the Nakdong river water. This strain could never be isolated from the raw water, but this strain was the predominant isolate in the ozonated water. Within a short incubation time, this organism was found to replicate well on acetate and oxalate as a sole carbon source. The yield coefficient of this organism for acetate and oxalate are the same order of magnitude of the value of P17 and NOX. The advantage of AOC determination using A. calcoaceticus might be the shortening of assay time due to the more rapid growth of this organism compared with that of P17 and NOX. With the full scale experiments, A.calcoaceticus was found to increase after ozonation, but did not decrease upon chlorination. The addition of biological treatment process such as biological activated carbon (BAC) filters after post-ozonation may appear to be an ideal solution to reduce the AOC concentration.
TCE , PCE 존재하에서 오존 / 과산화수소 정수처리공정에 의한 부산물 생성에 관한 연구
강준원,박훈수 ( Joon Wun Kang,Hoon Soo Park ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.2
A bench scale investigation was conducted of by products of trichloroethylene(TCE) and tetrachloroethylene(PCE) oxidation by the ozone/hydrogen peroxide advanced oxidation process(AOP). Post-chlorination of ozone/peroxide treated water was also investigated. Byproducts analyzed for TCE and PCE destruction in the ozone/peroxide experiments were chloral hydrate and di-and trichloroacetic acid (DCA and TCA). In TCE spiked (500∼700 ppb) ozone/peroxide runs, chloral hydrate was formed up to the level of 0.2 ppb and was slowly destroyed as the run progressed. Dichloroacetic acid and trichloroacetic acid was produced by the oxidation of TCE and PCE, respectively. In the post-chlorination experiments of PCE Spiked ozone/peroxide runs, concentration of chloral hydrate, DCA, and TCA were higher in the chlorinated water, but the levels seems to be quite below the maximum contamination level goal(MCLG) of USEPA.