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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%.
하수처리수 방류 하천의 물환경과 저서성 대형무척추동물 군집 생태 연구
손정원 ( Jung-won Son ),곽진숙 ( Jin-suk Kwag ),조갑제 ( Gab-je Cho ),류동춘 ( Dong-choon Ryou ) 한국물환경학회(구 한국수질보전학회) 2021 한국물환경학회지 Vol.37 No.3
Water quality, benthic macroinvertebrate communities, and other factors were investigated to explore the effects of the effluent discharge from a sewage treatment plant into Jwagwang stream in Busan in 2019. During the study period, the flow rate of this stream was in the range of 10,400 ㎥/day to 52,200 ㎥/day except for the discharge of about 24,000 ㎥/day of the effluent. After discharge, the flow velocity increased by about 65% and the water depth increased by about 40%. At sites downstream of the discharge point, BOD, COD, TOC, T-N, T-P, and other water quality values were worse than those of the upstream sites. The periphytic algal chlorophyll-a concentrations in the natural substrata were higher than those of the upstream sites, especially in May and August. However, at sites downstream of the discharge point, the individual numbers of Annelida were decreased and individual numbers of the insecta of arthropoda were increased. Also, species numbers and the diversity and dominance indexes were improved in the sites downstream of the discharge point. The functional feeding groups (FFGs) of collector-filterers were increased and the habitat orientation groups (HOGs) of sprawlers, burrowers, and clingers were especially increased at the sites with additional reclaimed wastewater effluent flow. Regardless of the effluent discharge, BMI, an indicator of ecological stream health using benthic macroinvertebrate species, did not show large gaps between the study points. Although the water quality of the sites downstream of the discharge point was much worse than those upstream, their ecosystem soundness was better than those of the upstream sites from an ecological perspective.