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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.
김상구,류동춘 ( Sang Goo Kim,Dong Choon Ryou ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.2
This study was conducted through jar-test and pilot-plant test to research coagulation effect of pre-ozonation on the contaminated water by organic matter (TOC), inorganic matter (kaolin) and algae specially diatom (chlorophyll-a). Pre-ozonation had not coagulation effect on the kaolin water further more acted as coagulation deteriorator on the organic matter water which imvolved humic acid more than 2㎎/ℓ as total organic carbon (TOC). But it had good coagulation effect on the nutriented water more than 40μ/ℓ as chlorophyll-a. Therefore pre-ozonation utility is desired for treating nutriented source water. We had added ozone to the netriented raw water increasingly 1㎎/ℓ from 1 to 5㎎/ℓ, About l∼3㎎/ℓ ozone treated water was appeared lower residual turbidity than of 5㎎/ℓ ozone contacted water and untreated water after jar-test. Compared residual turbidity of l㎎/ℓ ozone treated water to 3㎎/ℓ, we did not find significant difference of residual turbidity between two jar-test data. So we proposed 1㎎/ℓ as optimum pre-ozone dose for nutriented water. And pre-ozonation process had better coagulation effect to the higher chlorophyll-a concentration water. Authors also found out that pre-ozonation could save coagulant about 25%.
김상구(Sang Goo Kim),류동춘(Dong Choon Ryou),최근주(Keun Joo Choi),송미정(Mi Jeong Song),나영신(Young Shin Na),류재익(Jae Ick Ryoo),신판세(Pan Se Shin) 한국수처리학회 2000 한국수처리학회지 Vol.8 No.2
Generally the turbidity of surface water increased tens or hundreds times rapidly by degree of rainfall and intensity. High turbid water have problems with lower alkalinity and many fine particles smaller than 1.0㎛. High turbid water needs higher coagulant dose for removing the particles especially fine particles which have comparatively larger specific area. But lower alkalinity can not react sufficiently with added coagulant to form aluminium hydroxide for removing the fine particles. Therefore lime is supplied for increasing raw water alkalinity, it is necessity increasing coagulant for good coagulation after lime added. For increasing particle to particle collision chance, high velocity gradient and longer flocculation time is needed. Though higher velocity gradient can increasing collision chance, can not make large floc so lower velocity gradient needed for making large floc to the last flocculation stage. Proper arrangement of baffles or compartmentalizations in the flocculation basin can reduce short-circuiting and extend flocculation time. The around-the-end and over-and-under baffled channel are more effective to prolong detention time than diffuser wall.