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상수원수 내 천연유기물질의 계절적 변화와 정수공정에서의 제거특성
배병욱,김영일,임봉수,방미란 ( Byung Uk Bae,Young Il Kim,Bong Su Lim,Mi Ran Bang ) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.2
The seasonal variations of natural organic matters(NOM) in drinking water source and their removal characteristics through water treatment processes were investigated for two kinds of source waters in Kum-River. The quality of raw water at the Chungju water treatment plant(WTP) was stable throughout one year of sampling period. However, the source water at the Puyo WTP showed higher variations in DOC(dissolved organic carbon) and turbidity compared to the Chungju WTP. The SUVA(specific UV absorbance) values of both raw waters were less than 3 and had a trend to decrease after coagulation/sedimentation process. This results indicate that relatively large organic matters which have higher absorptivity per unit DOC might be easily removed during coagulation process. The AHS(aquatic humic substance) contents of both raw waters varied seasonally, but the Puyo WTP had a relatively higher AHS contents than the Chungju WTP. Results from the change in molecular weight distribution(MWD) before and after AHS measurement showed that AHS was mainly composed of organics higher than MW 1,000. The PAC(powdered activated carbon) might be used as an effective method for removing organic matters, especially for AHS, and the addition of PAC before coagulation showed the most satisfactory result with respect to DOC removal.
배병욱(Byung-Uk Bae) 대전대학교 환경문제연구소 2006 환경문제연구소 논문집 Vol.10 No.-
Analysis of design parameters of residual treatment process at eight model water treatment plants, which were located in the four major watersheds, showed that there were large differences between those design parameters and the actual conditions. In this background, a new procedure was proposed and applied to the Chungju water treatment plant as an example of the optimum design of residual treatment process based on the characteristics of raw water. In this design example, a filter backwash recycle system consisting of a surging tank and sedimentation basin was newly proposed for more safe recycle of spent backwash water. It is expected that the design procedure proposed in this study would be estimated as a meaningful attempt to develope new design procedure for the domestic water industry.
배병욱(Byung-Uk Bae) 대전대학교 환경문제연구소 2005 환경문제연구소 논문집 Vol.9 No.-
본 연구에서는 정수장에서 슬러지 처리용으로 사용되고 있는 중력식 농축조의 최적 설계와 운전을 위한 새로운 방법을 제안하였다. 8개 모델정수장 원수의 탁도 데이터를 분석한 결과, 원수의 종류에 따라 탁도와 고탁도 지속기간에 큰 차이가 있음을 확인하였다. 또한, 원수의 종류와 계절에 따라 한계 고형물 플럭스 (limiting solid flux, SFL)가 크게 변함을 확인하였다. 현행 설계기준에 의해 농축조를 설계할 경우, 다음과 같은 이유로 인해 농축조를 과소하게 설계가 우려 가 있다. 첫째, 설계탁도를 초과하는 고탁도가 일주일 이상 지속되기 때문에 장마철에 발생하는 슬러지 발생량에 충분히 대응하기 어려울 가능성이 있다. 둘째, 처리대상 슬러지의 한계 고형물 플럭스 자체가 현행 설계기준 (10 to 20 kg TS/m²/day)보다 작기 때문에 현재와 같은 방법으로 설계되는 농축조의 면적은 발생하는 슬러지를 처리하는데 요구되는 면적보다 크게 작을 우려가 있다. 이상과 같은 결과에 근거하여, 설계탁도를 95 % 확률탁도에서 80 % 확률탁도로 낮추고, 고탁도 기간에는 폴리머를 농축보조제로 사용하며, 그리고 보다 유연한 한계 고형물 플럭스를 설계에 적용하는 방안을 새로운 설계기준으로 제시하였다. A new procedure for the optimum design and operation of gravitational sludge thickeners in drinking water treatment plants (WTPs) has been proposed. Data analysis on raw water turbidity at eight model WTPs showed large differences in both turbidity and period of sustained high turbidity, depending on the type of water supply. The limiting solid flux (SFL) also varied remarkably according to water supply and season. Current design standards are likely to under-estimate the needed capacity of thickeners at WTPs taking water from reservoirs due to the following reasons. First, since the period of sustained high turbidity exceeding design turbidity lasts more than one week, designs to current standards may be inadequate to cope with the peak sludge production during the rainy season. Second, since the SFL of the sludge itself is usually lower than the design standard (10 to 20 kg TS/m²/day), the area of the thickener may be much less than that required for treating the sludge produced. Based on these findings, the new design guideline focuses on the adjustment of design turbidity from 95 % down to 80 % probability turbidity, intermittent use of polymer as a thickening aid during higher-than-design sludge production, and application of a more flexible range of solid loading rates.
배병욱(Byung-Uk Bae) 유기성자원학회 1995 유기물자원화 Vol.3 No.2
유가공폐수 처리를 위한 UASB 의 성능과 운전상의 문제점을 조사하였다. 인공 유가공폐수는 부하3.9kg COD/m3. day까지 성공적으로 운전이 가능하였으며, 이 때 90% 이상의 COD 제거율과 단위체적당 1. 23 1/1. day 의 가스가 발생하였다. 그러나,부하 2.1kg COD/m3 .day 에서는 침전부 표변에스컴층이 형성되면서 슬러지부상과 유실이 관찰되었다. 혈청병 (SBT) 실험으로 측정된 우유공장 실폐수와 아이스크림폐수의 생화학적 메탄생성능(BMP) 은 각각 0.135, 0.66ml CH4/mg CODadded 이었다. 반응조의 슬러지 활성도는 식종 초기에 0.159g COD-CH4/g VSS.d 에서 운전 90 일이 경과하 는 동안에 8배 이상 증가하였다. The performance and the operational problems of UASB(Upf!ow Anaerobic Sludge Blanket) reactor for treatment of dairy wastewaters were investigated. Synthetic milk wastewater was successfully treated up to the loading rate of 3.9kg COD/m3.day, with a specific gas production rate of 1. 23 1/1. day and a COD removal efficiency of over 90%. However, the sludge rising was observed at the loading rate of 2.1kg COD/m3.day, due probably to the formation of scum layer at the surface of settling compartment. The BMP(biochemical methane potentiaI) of raw milk wastewater and ice cream wastewater, measured by using SBT(serum bottle test) , were 0.135 and 0.66ml CH4/mg COD.dded, respectively. The sludge activity increased more than 8 times from 0.159g COD-CH4/g VSS. d during 90 days of operation.