• 생태와환경
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• 제38권spc호
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• pp.58-61
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• 2005

Environmental polluting materials from road surface drainage are a significant nonpoint source influenced to the eutrophication of lake and ecosystems with a transport development in recent years. To elucidate the discharge characteristics, the changing patterns in concentrations of polluting materials such as suspended solid (SS), chemical oxygen demand (COD), nitrogenous and phosphorus nutrients in drainage waters, were investigated during rainfall. Load variation of COD concentration in drainage water samples was closely related to that of SS concentration. This indicates that SS contained a greater part of organic matter. A quite difference between the past pavement and the new well-drainage pavement system was observed in the concentrations of SS and COD in drainage waters. Appreciable concentrations of nitrite and nitrate were determined in drainage waters. The present results indicate that the drainage water from road surfaces is a significant nonpoint source, and that the well-drainage pavement system introduced to skid prevention has an effect on the decreases of pollutants.

• 한국농공학회지
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• 제43권6호
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• pp.163-173
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• 2001

This study describes the characteristics of concentrations of pollutants such as total nitrogen(T-N), total phosphorous(T-P), and chemical oxygen demand(COD) at paddy areas during 2-year irrigation periods. The most common order in average concentrations of T-P and COD is podded water > irrigation(or drainage) water > percolated water. Most of pollutants concentrations in drainage water are lower than those in irrigation water after early July due to large uptake of pollutants by rice crop and denitrification. The exponential L (load)-Q(discharge) equations for classified irrigation periods are significant at 0.001 level for irrigation and drainage waters. For drainage water, the concentrations of T-N and COD slightly decrease with discharge, while the T-P concentrations slightly increase with discharge.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2004년도 학술발표회
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• pp.395-398
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• 2004

Characteristics of concentration of pollutants such as total nitrogen(T-N), total phosphorus(T-P) and chemical oxygen demand(COD) during dry days of $2002\~2003$ were investigated for streamwater from a rural watershed. Water was sampled and discharge was measured at 5-days intervals at outlet of study area. The mean concentrations of pollutants in non-irrigation and irrigation period not significantly different. For increasing discharge in 2002, TN concentration increased but COD concentrations decreases.

• 한국농공학회:학술대회논문집
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• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
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• pp.657-662
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• 1999

This study was conducted for the purpose of assessing the pollutant removal possibilities of sedimentation pool formed by deep dredging of a reservir inlet. Water quality data were collected in the Masan reservoir, whose inlet has been dredged deep like sedimentation pool. The average concentration of chemical oxygen demand(COD), total nitrogen(T-N) adnd total phosphorous(T-P) in the deep dredged area were 8.3∼28.4mg/$\ell$ (COD), 2.0∼6.0mg/$\ell$(T-N), 0.17∼1.34mg/$\ell$(T-P), which were 3.3% (COD) , 30.6%(T-N) and 46.4%(T-P) higher than those of middle part of the reservoir. From these results, it was considered the deep dredged area in the inlet of reservoir might play a key role to improve reservoir water quality.

• 한국수산과학회지
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• 제37권6호
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• pp.498-504
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• 2004

Removal of waste generated by Paralichthys olivaceus in the seawater aquarium using a foam separator was investigated. Protein concentration without a foam separator continuously increased until 3 days after stocking and reached at 25 mg/L after 5 days stocking, but protein concentration became lower than the initial protein concentration (2.5 mg/L) with a foam separator. The trends of other fish wastes such as ammonia, total suspended solids (TSS) and chemical oxygen demand (COD) were similar to protein. Dissolved oxygen (DO) in the aquarium decreased below 6.0 mg/L without a foam separator, but with a foam separator the average DO in the aquarium was 7.3 mg/L. Foam separation with the increase of superficial air velocity (SAV) was more effective than that with the fixed SAV. This study showed that wastewater. treatment of seawater aquarium using a foam separator is effective method for a fish waste removal and oxygen supply.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2008년도 제39차 학술발표회
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• pp.115-116
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• 2008

The textile wastewater discharged from printing and dyeing processes is characterized by high chemical oxygen demand(COD), low biochemical oxygen demand(BOD), and heavy color. The release of dyes into the environment constitutes only small proportion of water pollution, but dyes are visible in small quantities due to their brilliance. In this study, We are investigated to optimization of Ozone Oxidation process for Decolorization.

• KSBB Journal
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• 제22권3호
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• pp.129-133
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• 2007

This study represents that a removal efficiency of organic matters in wastewater is activated by a sludge process using new mixed microbial population. In case of mixed microorganisms, removal rates of suspended solid (SS), biochemical oxygen demand (BOD) and chemical oxygen demand (COD) were over 90 percent under experimental condition, and removal efficiency of organic matters, sludge density index (SDI) and capillary suction time (CST) in mixed population were higher than that in not-mixed microorganism, while total kjeldahl nitrogen (TKN) and total phosphorus (T-P) which indicate a degree of eutrophication were removed easily in both case. From these results, we may propose that an application of the mixed microbial population is useful to treat domestic wastewater including a great deal of organic matters.

• 한국축산시설환경학회지
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• 제7권2호
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• pp.77-82
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• 2001

This research was carried out to investigate the daily amount and characteristics of wastewater produced from bucket milkers, pipeline, tandem ad herringbone milking system for washing operations after milking included 28 dairy farms. The average amount of wastewater produced from milking system was 9.8l/head/day. The amount of wastewater varied from a low of 8.2 litters/head/day(pipeline milking system) to 13.4 litter/head/day(herringbone milking system). The moisture content, Biochemical Oxygen Demand($BOD_5$), Chemical Oxygen Demand($COD_{Mn}$), Suspended Solids(SS), Total Nitrogen(T-N) and Total Phosphorus(T-P) concentration of wastewater were 99.9%, 394mg/l, 417.3mg/l, 1,201.3mg/l, 3.78mg/l, 0.51mg/l.

• Environmental Engineering Research
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• 제25권1호
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• pp.36-42
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• 2020

Fenton process is one of the most effective advanced oxidation processes for the removal of pollutants from wastewater. In this study, while ferrous iron was used in conventional Fenton process (CFP); nano-sized iron(II, III) oxide was experienced in modified Fenton process (MFP) as a new catalyst alternative. In order to enhance their oxidation efficiencies, both CFP and MFP were combined with ultrasonication at 53 kHz fixed frequency. Thus, the influences of both catalyst iron species and ultrasonication on color and chemical oxygen demand (COD) removals from synthetic textile wastewater including Maxilon Red GRL 200% dyestuff were investigated experimentally. While the COD and color removal rates were found as 72.5% and 69.7% via CFP; they were 87% and 75.8% by ultrasonicated CFP, respectively. The color and COD removals were 40.6% and 64.8% via MFP, and 49.9 and 73.1% by ultrasonicated MFP, respectively. Therefore, it was found that the simultaneously usage of ultrasonication with CFP and MFP was improved the COD and color removal efficiencies and oxidation rates even at lower H₂O₂ dosages, compared to individual CFP and MFP. Moreover, the color and COD removal kinetics were also modelled mathematically and compared in the study.

• 생명과학회지
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• 제21권4호
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• pp.554-560
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• 2011

제지폐수의 효율적인 생물학적 처리와 폐수특성에 적합한 미생물제제의 개발을 위하여 토양 및 산업폐수로부터 방향족 화합물에 분해활성이 높은 KN11, KN13 및 KN27 균주와 세포 외 섬유소 가수분해효소 생산 균주 GT21 등의 균주를 분리하였다. 형태학적, 생리학적 및 생화학적 분류를 통해 이들 분리주 KN11, KN13, KN27 및 GT21 등은 Acinetobacter sp., Neisseria sp., Bacillus sp., Pseudomonas sp.와 유사한 것으로 판명되어 최종적으로 각각 Acinetobacter sp. KN11, Neisseria sp. KN13, Bacillus sp. KN27, Pseudomonas sp. GT21로 명명하였다. 제지폐수 중 난분해성 물질과 COD 증가원인 물질을 분석하고자 GC/MS를 이용하여 방향족 화합물 및 그 유도체들을 검출하였다. 분리균주 Acinetobacter sp. KN11, Neisseria sp. KN13, Bacillus sp. KN27 및 Pseudomonas sp. GT21의 균체로 구성된 미생물제제 J30을 제조하여 제지폐수의 효율적 처리를 위한 연구에 사용하였다. 미생물제제 J30의 제지폐수에서 COD 제거를 위한 최적온도와 pH는 각각 $30^{\circ}C$와 7.5였으며 배양 60시간에서 최대의 COD 제거효율을 나타내었다. 실험실 규모의 pilot plant에서 미생물제제 J30의 COD 제거효율은 87%의 높은 제거효율을 나타내었다.