정수장 플록형성지의 수리학적 특성과 교반강도가 플록형성 효율에 미치는 영향 = Effect of Hydraulic Property and Mixing Intensity of Flocculation Basin on Flocculation Efficiency in Water Treatment Plant

다국어 초록 (Multilingual Abstract)

The main purpose of the flocculation process is to make flocs bigger to be removed easily in the following processes. The flow pattern and mixing intensity have a great influence on flocculation. In this study, the flow pattern was examined by a hydraulic tracer-test, where 3 water treatment plants having 800,000 ㎥/d, 44,000 ㎥/d and 40,000 ㎥/d were employed. Also, the settling test was conducted to find out the relationship between the mixing intensity and the settling ability of flocs. The hydraulic tracer-test was conducted for the various flocculation processes that have different structures of flocculation basins. In the result, the retention time distribution (RTD) curves for the flocculation processes were quite different. In case of the inappropriate structure of the flocculation basin, the flow is not even so that the floc does not grow enough. To find out the relationship between mixing intensity and settleability of flocs, G-values were calculated and the settling test was conducted for two flocculation basins which have the same conditions except the G-value. For the flocculation basin with uneven G-value, the floc settleability was revealed poor. On the other hand, the flocculation basin with even G-value, the settleability was better than the previous one. From these experimental results, it is confirmed that the flow pattern is closely related to the structure of the flocculation basin and the settleability is affected by mixing intensity. Therefore the flow pattern and the strength of the mixing intensity should be examined sufficiently to design and operate flocculation basin.

참고문헌 (Reference)

1 "정수장 혼화공정에서 교반강도가 미치는 영향" 20 (20): 533-542, 1998

2 "정수장 플록형성지 운영 효율평가 및 개성방안" 19 (19): 511-519, 1993

3 "정수장 응집공정 설계방법의 개선방안" 137-140, 1996

4 "정수장 수리특성평가를 위한 추적자시험의 고찰" 8 (8): 19-28, 2000

5 "정수시설의 최적설계 및 유지관리" 그린테크노 619-625, 1991

6 "응집에 영향을 미치는 물리-화학 인자" 11 (11): 81-87, 1997

7 "Unit Operations and Processes in Environmental Engineering" 172-223, 1996

8 "Transport Processes and Unit Operations" prentice hall 140-153, 1995

9 "Mixing of Liquids in Chemical Processing" 44 (44): 2931-, 1952

10 "Hydraulic Analysis of Model Treatment Units" 104 (104): 785-, 1979

11 "Evaluation of Hydraulic Efficiency of Sedimentation Basins" 91 (91): 37-, 1965

12 "Breakthrough in the Tracer Studies of Sedimentation Tanks" 1969