남조류 Microcystis sp.가 고농도로 함유된 원수의 효율적인 정수처리를 위한 황토분말의 적용 (Application of Yellow Clay Powder for Efficient Treatment of Cyanobacterium Microcystis sp. -Laden Source Water in Drinking Water Treatment Facility)

서지정보

· 발행기관 : 대한환경공학회
· 수록지 정보 : 대한환경공학회지 / 44권 / 11호 / 397 ~ 405페이지
· 저자명 : 이혜진, 이유진, 배은영, 장경혁, 염훈식, 손희종

초록

목적 : 본 연구에서는 Microcystis sp.가 대번성시 침전보조제로서 황토분말 투입효과를 평가하였다. 방법 : Microcystis sp.가 고농도로 함유된 원수의 전산화(pre-oxidation) 처리 및 응집·침전실험은 쟈-테스터로 수행하였다. 전산화 처리 여부, 황토분말 투입농도 및 응집보조제인 폴리아민 투입농도에 따른 침전 후 상등수의 탁도와 입자물질을 분석하여 처리효율을 평가하였다. 결과 및 토의 : 황토분말 투입농도에 따른 응집·침전 후의 상등수 잔류탁도 및 입자물질을 평가한 결과, 전산화 처리 여부에 관계없이 황토분말 투입농도가 증가할수록 상등수의 탁도와 입자물질은 감소하였다. 특히, 전산화 처리를 수행하지 않은 조건에서 침전 후의 상등수 탁도와 입자물질은 현저히 감소하였다. 또한, 황토분말(50 mg/L)과 폴리아민(1.0 mg/L)을 함께 투입하면 전산화 처리 조건에 비해 전산화 처리를 하지 않은 조건에서 탁도는 25%, 입자물질 수는 41% 정도 감소하였다. 침전슬러지의 농축효율을 평가한 결과, 황토분말을 투입하면 황토분말을 투입하지 않은 조건에 비하여 전산화 처리 여부에 관계없이 31∼38% 이상 농축효율이 상승하였다. 그러나 전산화 처리를 하면 동일한 황토분말과 폴리아민 투입조건에서 전산화 처리를 하지 않은 경우에 비하여 농축효율이 27∼34% 정도 감소하였다. 결론 : Microcystis sp.가 고농도로 함유된 원수에 황토분말을 투입하면 전산화 처리 여부에 관계없이 응집·침전 이후에 탁도와 입자물질의 수가 효과적으로 감소하였다. 특히, 전산화 처리를 하지 않은 경우에는 전산화 처리를 한 경우에 비해 응집·침전 후 탁도와 입자물질의 수가 현저히 감소하였고, 응집보조제인 폴리아민과 함께 사용할 경우 탁도와 입자물질의 제거에 더욱 효과적이었다. 또한, 황토분말 투입에 따라 농축효율이 불량한 Microcystis sp. 함유 슬러지의 농축효율도 개선되었다. 주제어: 남조류, 마이크로시스티스, 황토 분말, 침전, 정수처리 공정

영어초록

Objectives : This study evaluated the effect of dosing yellow clay powder as a sedimentation aid when Microcystis sp. bloomed. Methods : The pre-oxidation (chlorination and ozonation) treatment and coagulation/precipitation experiments of Microcystis sp. laden source water were performed with a jar-tester. The treatment efficiency was evaluated by analyzing the turbidity and particle matters of the supernatant after sedimentation according to the pre-oxidation treatment, the concentrations of yellow clay powder and polyamine dosing. Results and Discussion : As a result of evaluating the turbidity and particle matters of supernatant after coagulation/sedimentation according to the dosing concentration of yellow clay powder, the turbidity of supernatant decreased as the dosing concentration of yellow clay powder increased regardless of pre-oxidation treatment. In particular, under the conditions in which the pre-oxidation treatment was not performed, turbidity and particle matters of the supernatant after sedimentation were significantly reduced. In addition, when yellow clay powder (50 mg/L) and polyamine (1.0 mg/L) were dosing together, the turbidity was reduced by 25% and the number of particle substances by 41% in the condition without the pre-oxidation treatment compared to the pre-oxidation treatment condition. As a result of evaluating the concentration efficiency of sedimentation sludge, when yellow clay powder was added, the concentration efficiency increased by more than 31∼38% regardless of pre-oxidation treatment compared to the condition in which yellow clay powder was not added. However, when the pre-oxidation treatment was performed, the concentration efficiency decreased by about 27∼34% compared to the case where the pre-oxidation treatment was not performed under the same yellow clay powder and polyamine dosing conditions. Conclusions : When yellow clay powder is added to Microcystis sp.-laden source water, turbidity and particle matters are effectively reduced after coagulation/sedimentation regardless of whether or not it is pre-oxidation treatment. In particular, when the pre-oxidation is not performed, the turbidity and particle matters after coagulation/sedimentation are significantly reduced as compared with the pre-oxidation treatment, and when used together with a polyamine is more effective. In addition, the sludge concentration efficiency of Microcystis sp.-containing sludge with poor concentration efficiency was improved by dosing yellow clay powder. Key Words : Cyanobacteria, Microcystis sp., Yellow Clay Powder, Sedimentation, Drinking Water Treatment Process

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