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유재정 ( Yu Jae Jeong ),민경석 ( Min Gyeong Seog ),박정민 ( Park Jeong Min ),황동진 ( Hwang Dong Jin ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.1
Reactive dyeing wastewater, a toxic and refractory pollutant, was treated by an electrochemical method using Ti/IrO₂ as anode and Stainless Steel 316 as cathode. A number of experiments were carried out in a batch and continuous system. Artificial samples and samples from mill were used for the treatment. Operation parameters, such as electrode shape(net or plate), the content of free chlorine evolution, effect of electrolyte, the effect of supporting electrolyte concentration, current density, pH and electrode gab were investigated for their influences on COD and color removal efficiencies during electrolysis. Finally, a continuous system using wastewater sampled from mill was operated. Results show that important factors for the increase in the pollutants removal efficiency were electrical properties of the electrode, the kind and concentration of electrolyte, and current density. The result indicate that the electrochemical treatment method is effective for the removal of color and COD from reactive dyeing wastewater.
연구논문 : 남강중권역 오염부하 전망 및 삭감 시나리오별 하류 수질예측
유재정 ( Jae Jeong Yu ),신석호 ( Suk Ho Shin ),윤영삼 ( Young Sam Yoon ),강두기 ( Doo Kee Kang ) 한국환경영향평가학회 2012 환경영향평가 Vol.21 No.4
Namgang mid-watershed is located in downstream of Nakdong river basin, There are many pollution sources arround this area and it`s control is important to manage a water quality of Nakdong river, A target year of Namgang mid-watershed water environment management plan is 2013, To predict a water quality at downstream of Namgang, we have investigated and forecasted the pollutant source and it`s loading, There are some plan to construction the sewage treatment plants to improve the water quality of Nam river. Those are considered on predicting water quality. As results, it is shown that the population is 343,326 and sewerage supply rate is 79.2% and the livestock is 1,662,000 in Namgang mid-watershed, It is estimated that the population is 333,980, the sewerage supply rate is 86.9% in 2013, The milk cow and cattle were estimated upward and the pigs were downward by 2013. The generated loading of BOD and TP is 75,957 kg/day and 4,311 kg/day, discharged loading is 18,481 kg/day and 988 kg/day respectively in 2006, It were predicted upward the discharged loading of BOD and TP by 4.08% and 6.3% respectively. The results of water quality prediction of Namgang4 site were 2.5 mg/L of BOD and 0.120 mg/L of TP in 2013. It is over the target water quality at that site in 2015 about 25.0% and 9.1% respectively. Consequently, there need another counterplan to reduce the pollutants in that mid-watershed.
유재정 ( Jae Jeong Yu ),이혜진 ( Hae Jin Lee ),이경락 ( Kyung Lak Lee ),이인정 ( In Jeong Lee ),정강영 ( Gang Young Jung ),천세억 ( Se Uk Cheon ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.5
This study was carried out to investigate algal community structures and their correlations with environmental factors on five weir areas in the Nakdong River, South Korea. Water qualities, hydrodynamics, meteorological conditions and algal species compositions were observed in studied sites from May 2010 to Dec. 2013. Results showed that average total phosphorus concentration of 2013 was decreased by 52.4% in comparing with that from 2010 to 2011. Chlorophyll.a concentrations were positive significant with water temperature, pH, total phosphorus and total nitrogen, but is not significant with turbidity and suspended solids. Seasonal successions of algae were observed that Stephanodiscus sp. was dominant species with 65.3% of dominant frequency in studied site. Large algal biomass of the low temperature-adapted diatoms were observed during temperature range of 4~9°C, but large cyanobacterial biomass mainly during high temperature period ranged from 22°C to 32°C. Microcystis sp. dominated during high water temperature in summer. The yearly correlations of algal biomass with accumulated solar radiations were not significant but seasonal correlations of summer from June to August were significant with correlation coefficient 0.33 (p<0.05). There were not significant correlations between turbidities and algal biomass. Turbidity and suspended solids concentrations were not significant correlation with algal biomass. According to the results, algal communities had strong correlation with water temperature and had partially correlation with solar radiation. For an effective management of algal blooms, water managers should survey with more long-term monitoring of various environmental factors and algal communities.
유재정 ( Jae Jeong Yu ),이경락 ( Keung Lak Lee ),이혜진 ( Hye Jin Lee ),황정화 ( Jeong Wha Hwang ),류희성 ( Heuy Seong Lyu ),신라영 ( La Young Shin ),박아름 ( A Reum Park ),천세억 ( Se Uk Chen ) 한국물환경학회 2015 한국물환경학회지 Vol.31 No.2
The construction of the eight large weirs in the Nakdong River, the second largest river in Korea, caused big changes in the physical environment of the water system. Algal communities and their correlations with environmental factors, mainly nutrients were studied at five weir areas in the Nakdong River from 2010 to 2013. Water quality, hydrodynamics and algal composition were investigated. Results showed that flow velocities were reduced compared with that before weir construction near the areas where are located in the mid and upstreams of the Nakdong River. A seasonal algal community succession was observed and it was mainly correlated with temperature and phosphorus. Diatoms were dominated from winter to spring months and massive diatomic blooms of Stephanodiscus sp. occurred early in March during survey period. Cyanobacterial blooms of Microcystis sp. occurred from July to September 2013 and was preceded by the lower total phosphorus concentration of 0.05 mg L-1. The correlations between total phosphorus concentrations and algal abundances were not significant during the survey periods. However, significant correlation with cyanobacteria was found in the period of weir construction after only at the GG survey site and blooms periods of 7 times in the survey sites, and its correlation coefficients were 0.53 (p<0.001) and 0.42 (p<0.01) respectively. When algal bloom was observed, partially low nutrient concentration was observed in the Nakdong River. In conclusion, partially low nutrient concentration which may result from algal bloom was observed, and we presume it caused the reduction of algal abundunces.
NTrend 1.0에 의한 낙동강 수질 장기변동 추세분석
유재정 ( Jae Jeong Yu ),신석호 ( Suk Ho Shin ),윤영삼 ( Young Sam Yoon ),송재기 ( Jae Kee Song ) 한국물환경학회 2010 한국물환경학회지 Vol.26 No.6
The effect of seasonality on water quality variation is very significant. Generally, it reduce the power of the trend extraction. A parametric time-series model was used for detecting trends in historic constituent concentration data. The effect of seasonality is able to remove from time series decomposition technique. According to such statistic methode, long-term water quality trend analysis system (NTrend 1.0) was developed by Nakdong River Water Environmental Research Center. The trend analysis of BOD variation was conducted with NTrend 1.0 at Goreong and Moolkum site in Nakdong river to show the effect of water quality management action plan. Power test of trend extraction was tried each case of `deseasonalized and deannulized` data and `deseasonalized` data. Analysis period was from 1989 to 2006, and it`s period was divided again three times, 1989~1993, 1994~1999 and 2000~2006 according to action plan period. The BOD trend was downward in Goreong site during three times and it`s trend slope was very steep, and upward in Moolkum during 1989~1993, but it was turned downward during 1994~1999 and 2000~2006. It was revealed that it`s very effective to reduce the concentration of BOD by water quality management action plan in that watershed. The result of power test was shown that it is high for trend extraction power in case of `deseasonalized` data.