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鄭滎淑,孫仁植 釜産工業大學校 1984 論文集 Vol.25 No.-
The activated sludge process is efficient in the wastewater treatment, but we can point out the difficult solid-liquid separation, sludge bulking by the filamentous bacteria, and rising sludge by denitrification in the clairifier. In the grickling filter, by the clogging and plugging the effluent quality is worse than the activated sludge process. But it is good for solid-liquid separation by long SRT, and for less sludge production. The FMAS process takes the advantages of the processes. When the retention time is less than 8 hours, the less the influent concentration is, the better the COD removal efficiency is in comparison with the aeration only system. When the influent concentration is same and the retention time is more than 4 hours, the COD removal effiency in the FMAS process is very different from that of the aeration only system. The SCOD removal efficiency in the FMAS process is better than the aeration system independent of the retention time. The SS removal efficiency is not affected by the influent concentration, and when the retention time is more than 5 hours SS is removed more than 90%. As the res-ults of this experiment, the parameters for microoranism growth is as follows: K??=5.46/hr, 2.20hr, Y=0.33-0.31㎏ MLSS/㎏ BOD-day, K??=0.20-0.49, K??=1.34-3.71/hr. Cpnsequently, we can get the better effluent quality without clairifier system by the FMAS process than those by the aeration only system, and can get the sludge treatment and disposal easily. When the influent concentration is low, organic removal rate is high but when the influent concentration is high, it is as same as those of the aeration only system. The quantity of adsorbed sludge per the surface area of media is much than other data.
전오존 주입이 낙동강 상수원수질 및 응집효과에 미치는 영향
류동춘,정형숙,양병수 ( Dong Choon Ryou,Hyung Sook Chung,Byung Soo Yang ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.4
In advanced water treatment, it has been reported that pre-ozonation attributed to the preceeding processes through the enhancement of coagulation by the oxidation of algae, organic, and inorganic matters in the raw water as well as it enhanced the quality of the treated water by preventing the formation of the disinfection by-products. In this research, in order to find the effects of the pre-ozonation on the conventional water treatment system with raw water from the Nak-dong River and to get the optimal design factors and the operational conditions of ozone, the followings were concluded from the batch experiments. 1. The variation of DOC and UV-254 concentrations during ozone oxidation of raw water were not much at the ozone dosage of 2 to 3㎎/ℓ and contact time of 3 to 5minutes, while the disinfection efficiency for algae based on chlorophyll-a concentration was increased according to the increase of ozone dosage and contact time. 2. At the coagulation-sedimentation test followed by pre-ozonation, turbidity removal efficiency was not improved apparently independent from ozone contact time. But the capability of coagulation was increased compared to the case without preozonation. 3. Optimal ozone dosage to the raw water will increase the DOC and UV-254 removal efficiencies through the coagulation improvement. 4. The optimal operational conditions for pre-ozonation to improve the efficiency of the coagulation -sedimentation process in the existing water treatment plant were found to be ozone dosage of 2 to 3㎎/ℓ and contact time of 3 to 5 minutes. 5. Based on this experiment, the pre-ozonation may improve the raw water quality in the Nak Dong River.