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준 경험 생물막 모델(Semi-Empirical Biofilm Model)을 이용한 BAF 운전평가 및 적정 운전방안 도출
유광태 ( Kwang Tae Yoo ),김종락 ( Jong Rack Kim ),윤주환 ( Zuw Han Yun ),황호재 ( Hojae Hwang ),이한샘 ( Han Saem Lee ),김성표 ( Sung Pyo Kim ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.3
The objective of this study is to find out whether the developed semi-empirical biofilm model can be applicable to real BAF pilot-scale wastewater treatment. In addition, the optimum operating conditions of BAF as a function of process variables such as organic loading change can be drawn based on the simulation results of model. The results will provide the economic and efficient BAF process design and operating control. As a result, developed semi-empirical biofilm model which is relatively simple compared to mathematical model can simulate three BAF processes consisted of 25 layers within 1 seconds. When this model was used for simulating real pilot scale BAF process and the simulated water quality values were compared to experimental ones, simulated TCOD, SCOD, TN, NH4 +-N, NOx --N, alkalinity values were different to experimental ones within 21%, 20%, 8.1%, 48%, 10%, and 23%, respectively. Therefore, if the BAF system was equipped with automatic control, the BAF process can be better efficiently adapted under the condition of significant change of influent loading.
김재희 ( Jae Hee Kim ),유광태 ( Kwang Tae Yoo ),전환돈 ( Hwan Tae Yoo ),장재선 ( Jae Sun Jang ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.2
Due to the deterioration of water supply network and the deficiency of raw water, the water utility of local governments have performed various projects to improve their revenue water ratio. However, it is very difficult to estimate the cost for maintaining the revenue water ratio at higher level after completing the project, because local governments have different conditions affecting the operating and maintenance cost of water supply network. The purpose of this study is to present a procedure to estimate the operating and maintenance cost required to maintain the target revenue water ratio of the water supply network. For this purpose, we estimated the cost used only for operation and maintenance of water supply network of 164 local governments with the aid of K-Mean Clustering Analysis and the data from 40 representative local governments. Then, the regression analysis was performed to find relationship between revenue water ratio and the operating and maintenance cost with two different data sets generated by two classification methods; the first method classifies the local governments by means of k-means clustering, and the other classifies the local governments according to the index standardized by the operating and maintenance cost per unit length of water mains per revenue water ratio. The results shows that the method based on the index standardized by the cost and revenue water ratio of each government produces more reliable results for finding regression equations between revenue water ratio and the operating and maintenance cost only for water supply network. The estimated regression equations for each group can be used to estimate the cost required to keep the target revenue water ratio of the local government.
생석회를 이용한 하수소화슬러지의 복토재와 토지재료재로서의 이용 가능성
최의소(Eui So Choi),유광태(Kwang Tae Yoo) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.3
Applicability of lime stabilized sludge as a landfill cover material or soil conditioner was discussed. Optimum quick lime dosage was about 60% of total solid(dry base) for landfill cover material and about 80%(dry basis) for soil conditioner. The lime stabilized sludge reduced MPN of Colifom to 99.99% and was classified as SP-SM or SW-SM with a permeability of 0.32 to 5.8×10E-4 ㎝/sec. EP toxicity test was conducted on allowable heavy metal concentrations.