BAC 공정에서 파라벤 및 할로겐화 파라벤류의 생물분해 특성 및 동력학 평가 (Evaluation of Biodegradation Characteristics and Kinetic of Parabens and Halogenated Parabens in Biological Activated Carbon (BAC) Process)

서지정보

· 발행기관 : 대한환경공학회
· 수록지 정보 : 대한환경공학회지 / 40권 / 7호 / 290 ~ 298페이지
· 저자명 : 염훈식, 손희종, 김희영, 이윤호, 류동춘, 김창원

초록

상수원수 중에 잔존하는 methylparaben류(MPs)가 정수처리 공정으로 유입되면 염소와 반응하여 할로겐화된 paraben 류가 생성된다. 본 연구에서는 할로겐화된 paraben류들의 생물활성탄 공정에서의 생물분해 제거 특성에 대해 평가하였다.
Methylparaben (MP)와 할로겐화 MP류 5종의 생물분해능은 MP가 가장 높았으며, chloro-methylparaben (Cl-MP), bromomethylparaben (Br-MP), dichloro-methylparaben (Cl2-MP), bromo,chloro-methylparaben (Br,Cl-MP) 및 dibromo-methylparaben (Br2-MP) 순으로 나타났다. MP, Cl-MP 및 Br-MP는 수온 5 에서도 empty bed contact time (EBCT) 5분에서 완전 제거되었으나, Cl2-MP와 Br2-MP의 경우는 EBCT 15분에서도 각각 79.8%와 65.3% 제거되었으며, 수온 25 , EBCT 15분의 조건에서도각각 99.1% 및 94.6%의 제거율을 나타내어 BAC 공정에서 제어하기가 어려운 물질로 평가되었다. BAC 공정에서 수온5 ~25 에서의 Br2-MP의 생물분해 속도상수(kbio)와 반감기(t1/2)는 각각 0.0671 min-1~0.2358 min-1 및 2.9 min~10.3 min이었으며, Cl2-MP의 경우는 kbio와 t1/2이 각각 0.1005 min-1~0.3458 min-1 및 2.0 min~6.9 min이었다. Cl2-MP, Br,Cl-MP 및 Br2-MP의 생물분해 중간생성물질로 MP가 생성되며, BAC 공정 처리수 중에 MP가 잔존할 경우 후염소 처리에 의해 할로겐화-MP류의 재생성 가능성이 있어 이에 대한 추가적인 연구가 필요하였다.

영어초록

When the methylparabens (MPs) remaining in the raw water is introduced into the water treatment process, halogenated parabens are produced by reacting with chlorine. In this study, biodegradation characteristics of halogenated parabens in biological activated carbon (BAC) process were evaluated. The biodegradability of methylparaben (MP) and five halogenated MP species were highest in MP, followed by chloro-methylparaben (Cl-MP), bromo-methylparaben (Br-MP), dichloro-methylparaben (Cl2-MP), bromo,chloro-methylparaben (Br,Cl-MP) and dibromo-methylparaben (Br2-MP). MP, Cl-MP and Br-MP were completely removed under conditions of water temperature 5 and EBCT 5 min. In the case of Cl2-MP and Br2-MP, 79.8% and 65.3% of removal rate were represented at EBCT 15 min and 99.1% and 94.6% of Cl2-MP and Br2-MP were removed under conditions of water temperature 25 and EBCT 15 min. These results indicate that these compounds are difficult to control the BAC process. The biodegradation rate constants (kbio) and half-life (t1/2) of Br2-MP at the water temperature of 5 to 25 in the BAC process were 0.0671 min-1~0.2358 min-1 and 2.9 min to 10.3 min, respectively, and in case of Cl2-MP, kbio and t1/2 were 0.1005 min-1~0.3458 min-1 and 2.0 min~6.9 min, respectively. MP is produced as a biodegradation intermediate of Cl2-MP, Br, Cl-MP and Br2-MP, and if MP remains in the BAC-treated water, the possibility of regeneration of halogenated-MPs by post-chlorination and further study is needed.

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