• 한국물환경학회지
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• 제25권4호
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• pp.547-552
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• 2009

Because of refractory property of light, the travel path of UV light becomes longer than the straight line and shorter solely in water as UV light passes sequentially through air, quartz and water. Note that water significantly absorbs UV light. Hence, UV intensity shall be estimated to be lower when refraction is neglected than it is considered. Reflection is also critical for the design of UV radiation system. While the reflection at the interface of air and quartz is low enough to ignore, it is too high to be ignored at the interface of quartz and water. Assuming constant power, smaller length to width ratio of UV reactor is beneficial and single-lamp system is preferred to multi-lamps. Under the given cross section, optimal lamp positions could be decided. For example of an elliptical reactor with dual lamps, the optimal lamp locations shall be the 1/3 and 2/3 position of the longer axis.

• 한국환경과학회지
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• 제14권3호
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• pp.327-333
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• 2005

The performance of ozone contactor in ozone-BAC advanced water treatment process was evaluated by the degree of decomposition of organic matters. The degree was measured by the analyses of $UV_{254}$ absorbance and the concentrations of DOC and BDOC for the sand filtered water and the ozone treated water, respectively. In addition, the ozone concentration in the contactor, required for the maximum BDOC concentration, was selected as the optimum concentration, and the appropriate residential time of ozone treated water in a reservoir was recommended based on the residual ozone concentration in the treated water. The following results were obtained from the pilot scale experiments. By ozonation $UV_{254}$ absorbance was decreased, and BDOC concentration was increased. The change of DOC concentration by ozonation was negligible, but the excess input of ozone resulted in the removal of the small amount of BDOC by complete oxidation. The optimum ozone concentration was 0.58mg $O_3/mg$ DOC. In order to remove residual ozone, 20minutes of the residential time were enough after ozonation.

• 조명전기설비학회논문지
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• 제15권1호
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• pp.70-77
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• 2001

본 논문에서는 고도정수처리설비에 활용되는 오존접촉조의 반응 특성을 퍼지 모델 형태로 표현하는 방법을 제안한다. 퍼지모델에 사용될 입력 및 출력 변수들은 오존처리의 목적과 정수장의 수질관리항목을 기준으로 선정하였다. 제안된 입력 변수들은 용존유기탄소농도, $UV_{254}$흡광도, 과망간산칼륨소비량, 주입오존농도, 수온 및 접촉시간이며, 출력변수들은 용존유기탄소농도, $UV_{254}$흡광도 및 과망간산칼륨소비량이다. 입력변수들에 대한 소속도 함수들은 삼각형 형태로 설계하였으며, 파이롯플랜트에서 취득한 조업데이터를 참고하여 소속도를 결정했다. 퍼지모델의 결론부는 선형식 형태로 설계하였으며, 선형식에 포함되는 상수들은 조업데이터를 이용하여 최소자승법으로 구했다. 또한 출력 변수들간에 상호 영향이 없다는 특성으로부터 전체 퍼지모델로을 각 변수별로 독립적인 기능을 갖는 3개의 부분 퍼지모델로 분할하여 설계함으로서 계산과 이해의 편리를 도모하였다. 모의실험을 통해 제안된 퍼지모델의 타당성을 확인해 본 결과, 모델의 튜닝시에 사용한 입력 데이터에 대해 퍼지모델의 출력이 조업데이터와 거의 동일함을 알 수 있었다.