• Title/Summary/Keyword: 정수지 개선

Search Result 5, Processing Time 0.021 seconds

정수지 소독능 진단에 관한 고찰

  • 박승철;이창수
    • Proceedings of the Korean Environmental Sciences Society Conference
    • /
    • 2004.11a
    • /
    • pp.205-206
    • /
    • 2004
  • 국내 정수처리에 있어 기존 장티프스, 콜레라 등과 같은 병원성 세균의 소독 뿐만아니라 최근에는 지아디아, 크립토스포리디움과 같은 병원성 원생동물의 불활성화에 대하여 많은 관심을 가져야 하며 적정한 소독능을 확보하기 위해서는 정수지의 도류벽 설치, 용량확장, 수위비조절 및 잔류염소 농도 조절 등의 운영 및 시설개선이 필요한 것으로 판단된다.

  • PDF

Internal Short-circuiting Estimation in Clearwell : Part B. Improving T10/T Using Intra Basin and Diffuser Wall by Applying ISEM to Field (정수지 내부 단락류 발생 평가 : Part B. 내부 단락류 평가 방법의 현장 적용을 통한 내부 도류벽과 정류벽을 이용한 T10/T 증가분석)

  • Shin, Eunher;Lee, Seungjae;Kim, Sunghoon;Park, Heekyung
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.22 no.1
    • /
    • pp.113-120
    • /
    • 2008
  • A large majority of clearwell must be modified with maintaining the present baffles since they were underground built with the material like concrete. Therefore it is unreasonable to apply the previous research in clearwell modification which is studied with the assumption that distance between baffles is constant. In this study, internal short-circuiting estimation method (ISEM), which has the advantage of being applied at any condition, is applied to evaluate modification of A clearwell and modify B and C clerwell which have unusual characteristics. After analyzing the hydraulic efficiency at current state, modifications, where baffles, intra basins and diffuser walls are additionally installed, are considered and evaluate using ISEM. And the effect of intra basin and diffuser wall on $T_{10}/T$ is estimated and application feasibility of ISEM is evaluated. The improvement of intra basins is almost same with that of baffles. Also, short-circuiting in effluent zone can be reduced with the same level of channel zone if intra basin is added in effluent zone. However, effect range is restricted to the next channel zone. Diffuser wall can obtain the lower ISI than minimum ISI of cases where baffles and intra basins are installed. Therefore, additional improvement of $T_{10}/T$ value can be expected after $T_{10}/T$ value converges maximum only using baffles

Evaluation of a Gifted Education Program for Mathematically Gifted Children in Seoul Area (초등 수학 영재 프로그램 평가 - 서울시 A 교육청 평가 사례를 중심으로 -)

  • Jeong, Soo Ji;Kim, Min Kyeong
    • Journal of Elementary Mathematics Education in Korea
    • /
    • v.18 no.1
    • /
    • pp.149-168
    • /
    • 2014
  • Growing in its size, the contents of the teaching-learning programs for mathematically gifted children from A program in Seoul Metropolitan Office of Education were examined in terms of the individual subjects provided through the courses of gifted education programs, and it was evaluated based on the revised version of the existing module. As a result, the educational objectives of teaching-learning program were clear, differentiated and obtainable. Among the program, the advanced parts were more than the selective parts, which mainly consisted of numbers and calculation, shapes, regularity and problem solving parts and had latest contents of research in balance. Additionally, every part of the program needs mathematical and creative thinking and approach and has proper evaluation index for problem solving. The presented materials in the programs are specific and appropriate, though some of them did not suggest the evaluation index for cultivating personality and value clearly and the reference books. The teaching-learning programs were focusing on problem-based learning and cooperative learning and using performance assessment for evaluation.

  • PDF

Antioxidant and Synergistic Activities of Fruit and Vegetable Concentrates (과채류 농축액의 항산화 및 상승효과)

  • Jeong, Su Ji;Shim, Hee Ryung;Lee, Ji-Soo;Nam, Hee Sop;Lee, Hyeon Gyu
    • Korean Journal of Food Science and Technology
    • /
    • v.47 no.2
    • /
    • pp.240-245
    • /
    • 2015
  • The principal objective of this study was to investigate the antioxidant and synergistic effects of fruit and vegetable concentrates. Ten foods from two categories, including fruits (raspberry, blackberry, blueberry, acai berry, aronia, cranberry, wild berry, and red grape) and vegetables (spinach and cabbage) were combined in pairs. The antioxidant activity of the individual and combined samples was measured using DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate) and FRAP (ferric reducing antioxidant power) assays. Synergistic antioxidant activities of the combinations of cabbage and acai berry, and blueberry and cranberry showed the most significant (p<0.05) increase in the DPPH and FRAP assays, respectively. In addition, the combination of cabbage and red grape demonstrated significantly high synergistic interaction in both DPPH and FRAP assays (p<0.05). These results indicate the importance of strategic selection of foods and their composition ratio for maximum synergistic antioxidant activity.

A Study on the Seismic Response Formula for Improvement of Seismic Design Code of Water Treatment Underground Structures (수처리 지중구조물의 내진설계 기준 개선을 위한 지진 응답 제안식의 관한 연구)

  • Lee, Joung-Bae;Bae, Sang-Soo;Chung, Kwang-Mo;Bang, Myung-Seok
    • Journal of the Korean Geosynthetics Society
    • /
    • v.21 no.3
    • /
    • pp.41-48
    • /
    • 2022
  • Generally it was known that member forces in the earthquake resistant design is lower than those in the general design. But it is not true in cases of water treatment underground structures, which is different in each case like water treatment plant, sedimentation basin, and utility-pipe conduit. Also, looking at the scale of earthquakes that have recently occurred in Korea, large-scale earthquakes are frequent, so when the magnitude of the design seismic force increases, it is necessary to investigate the seismic behavior of the water treatment underground structure and to deal with it. In this study the change rate of member forces was investigated by the change of design load factor (earthquake acceleration design criteria), earth depth, underground water level. The pseudo-static analysis and response displacement method was applied, and various analyzes were conducted depending on the ground water and soil depth. The proposed formula in this study will be efficient when the earthquake design code of water treatment underground structures is revised.