표준정수처리공정에서 분말활성탄과 중간염소를 이용한 지오스민 저감방안 (Removal of Geosmin by Combined Treatment of PAC and Intermediate Chlorination in the Conventional WTP)

서지정보

· 발행기관 : 대한환경공학회
· 수록지 정보 : 대한환경공학회지 / 37권 / 1호 / 7 ~ 13페이지
· 저자명 : 김태균, 최재호

초록

본 연구에서는 맛․냄새 물질 발생시 표준정수처리공정에서 지오스민과 활성탄 주입량을 효과적으로 저감하는 방안을 제시하였다. 염소처리방식에 따른 지오스민 제거효율을 평가한 결과, 저농도(< 25 ng/L)의 경우 전염소와 중간염소를 동시에운영할 경우 지오스민 제거율은 46%인 반면, 중간염소로 운영한 공정의 지오스민 제거율은 57%로 나타났다. 중농도(25~79ng/L)에서는 전염소와 중간염소로 운영한 지오스민 제거율은 59%, 중간염소로 운영한 지오스민 제거율은 87%로 나타났다.
고농도(> 80 ng/L)에서도 전염소와 중간염소를 동시에 운영한 지오스민 제거율은 67%인 반면 중간염소로 운영한 지오스민제거율은 95%로 나타나 중간염소로 운영시 제거율이 높아지는 것으로 나타났다. 지오스민 농도별 측정결과와 활성탄 투입량의 상관성을 분석한 결과, 결정계수(R2)는 0.96 으로 나타나 적합한 분말활성탄 조견표를 제안하였다. 또한, 지오스민 물질발생 초기에 중간염소와 활성탄을 동시에 투입 시 원수농도가 급격히 증가하여도 지오스민의 입자성 물질을 지속적으로 제거할 수 있어 활성탄 저감 뿐만 아니라 정수 기대농도도 만족할 수 있었다.

영어초록

In this study, the effective treatment reducing geosmin and dosage of PAC was suggested when taste & odor compoundsflow in. The removal efficiency of geosmin was evaluated with types of chlorination. In case of low geosmin concentration below25 ng/L, removal efficiency of geosmin was estimated at 46% by combined treatment of pre and intermediate-chlorination. But,in the exclusive intermediate-chlorination treatment, removal efficiency of geosmin was increased to 57%. In the medium geosminconcentration (25~79 ng/L), removal efficiency of geosmin was estimated at 59% by combined treatment. But, in the exclusiveintermediate-chlorination treatment, removal efficiency of geosmin was increased to 87%. When high geosmin concentration above80 ng/L flows in, removal efficiency of geosmin was estimated at 69% by combined treatment. However, in the exclusive intermediatechlorinationtreatment, removal efficiency of geosmin was increased to 95%. Then, the exclusive intermediate-chlorination has animportant effect on removal of geosmin. After correlation of geosmin concentration and dosage of PAC was analyzed, the coefficientof determination was estimated at 0.96. And, the proper PAC dosage chart was proposed. Also, at a initial occurrence of geosmin,when the combined treatment by intermediate-chlorination and PAC was applied, particle-bound geosmin should be removedcontinuously. Finally, it is proved that the combined treatment was effective to remove the geosmin by threshold levels as well as toreduce the dosage of PAC.

참고자료

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