• 대한환경공학회지
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• 제29권6호
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• pp.662-669
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• 2007

Rhodamine B(RhB) 폐수의 색도와 COD 제거를 위해 $O_3$, $UV/TiO_2$, $O_3/UV$ 및 $O_3/UV/TiO_2$ 공정과 같은 고급산화법의 영향을 연구하였다. 오존 공정의 경우 오존 농도가 높을수록 탈색속도가 높아졌으며, $UV/TiO_2$와 $O_3/UV/TiO_2$ 공정의 최적 $TiO_2$ 농도는 0.4 g/L 였다. $O_3/UV$ 공정은 오존 공정에 비해 초기 탈색속도상수가 높고 탈색종결시간도 줄어드는 것으로 나타났다. 실험에 적용한 공정의 초기 탈색속도상수의 순서는 $O_3/UV/TiO_2>O_3/UV>O_3>UV/TiO_2$로 나타났다. 모든 공정의 탈색속도가 COD로 표시한 무기화 속도보다 빠르고, COD는 처리에 시간이 더 소요되는 것으로 나타났다. COD 제거속도는 $O_3/UV/TiO_2>O_3/UV>UV/TiO_2{\geqq}O_3$의 순서로 나타났다. 네 공정 중에서 광촉매와 오존 공정을 조합한 $O_3/UV/TiO_2$ 공정이 염료 폐수와 같은 폐수의 색도와 COD 제거에 적절한 것으로 나타났다.

• 생명과학회지
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• 제13권6호
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• pp.917-923
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• 2003

P. aeruginosa EMS1에 의한 수용성 절삭유의 생물학적 처리를 위한 환경요인과 최적조건을 검토한 결과는 다음과 같다. 절삭유속에 함유된 각종 성분을 이용한 P aeruginosa EMSl의 생육 및 절삭유 분해 가능성을 검토하기 위하여 증류수에 절삭유를 1% 농도로 첨가하여 멸균한 후, P aeruginosa EMSl를 접종하여 균체 생육도 및 COD 제거율을 조사한 결과, 균주의 생육도는 극히 미약하고 약 12%의 COD 제거능을 가지고 있었다. 이것은 균주의 생육과 효율적인 COD제거능을 위하여 절삭유 속에 함유된 성분 외의 다른 일반적인 배지성분이 필요함을 시사한다. P. aeruginosa EMS1에 의한 1% 수용성 절삭유의 COD 제거율과 균주 생육도 향상을 위한 최적 배지조성은 0.3% NH_4NO_3,\; 0.05%\; K_2HPO_4,\; 0.04% KH_2PO_4,\; 0.05%\; MgSO_4.7H_2O,\; 0.03%\; CaCl_2.2H_2O,\; 0.04%\; FeSO_4.7H_2O$이었고, 최적배양 조건은 pH 7,$30^{\circ}C$, 50m$\ell$ / 300m$\ell$flask이었다. 이 조건에서 배양 4일 후, 87%의 COD가 제거되었다. 최적배지에서 COD 제거에 미치는 절삭유 농도의 영향을 조사한 결과, 절삭유 농도가 낮을수록 relative COD(%)가 낮았으며, 균체 생육도가 높음을 알 수 있었다. 따라서 본 연구의 결과를 바탕으로 하여 현재 폐절삭유의 처리를 위해 시행되고 있는 물리화학적 처리 시스템의 후속 공정으로 생물학적 처리시스템을 구축하고, 표준 균주로서 P. aeruginesa EMS1이 사용될 경우, 잔여 절삭유의 완전 분해가 가능할 것으로 사료된다.

• Journal of Microbiology and Biotechnology
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• 제26권5호
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• pp.900-908
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• 2016

The effects of algal inoculation on chemical oxygen demand (COD) and total nitrogen (TN) removal, and indigenous bacterial dynamics were investigated in municipal wastewater. Experiments were conducted with municipal wastewater inoculated with either Chlorella vulgaris AG10032, Selenastrum gracile UTEX 325, or Scenedesmus quadricauda AG 10308. C. vulgaris and S. gracile as fast growing algae in municipal wastewater, performed high COD and TN removal in contrast to Sc. quadricauda. The indigenous bacterial dynamics revealed by 16S rRNA gene amplification showed different bacterial shifts in response to different algal inoculations. The dominant bacterial genera of either algal case were characterized as heterotrophic nitrifying bacteria. Our results suggest that selection of indigenous bacteria that symbiotically interact with algal species is important for better performance of wastewater treatment.

• 한국염색가공학회지
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• 제9권6호
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• pp.26-32
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• 1997

In order to remove the pollutants effectively in the dye-processing wastewater by chemical precipitation, coagulation and flocculation test was carried out using several coagulants on various reaction conditions. It was found that the Ferric sulfate was best coagulant for the treatment of mixed dye-processing wastewater. When the Ferric sulfate dosage was 1,100mg/$\ell$, the COD removal rate was very high(50%), and the color was removed very effectively. The COD was decreased relatively well up to 40%, when Alum was dosed as coagulant. But it was difficult to remove the color effectively. Test results about COD removal for the Ferrous sulfate and the Ferric chloride used were mostly same as those of the Alum used. However, the color removal by the Ferrous sulfate was much better than the case of the Alum or the Ferric chloride. It was found that the COD removal was increased and the sludge yield was decreased by pH control before polymer flocculant addition, during the jar test for the Ferrous sulfate and the Ferric sulfate as a coagulant.

• 한국환경과학회지
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• 제15권1호
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• pp.67-75
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• 2006

The degradation of Rhodamine B (RhB) in water was investigated in laboratory-scale experiments, using five advanced oxidation Processes (AOPs) $UV/H_2O_2$, lenten, photo-lenten, $UV/TiO_2,\;UV/TiO_2/H_2O_2$. The photodegradation experiments were carried out in a fluidized bed photoreactor equipped with an immersed 32 W UV-C lamp as light source. initial decolorization rate and COD removal efficiency were evaluated and compared. The results obtained showed that the initial decolorization rate constant was quite different for each oxidation process. The relative order of decolorization was: photo-fenton > $UV/TiO_2/H_2O_2$ > fenton > $UV/H_2O_2$ > $UV/TiO_2$ > UV > $H_2O_2$. The relative order of COD removal was different from decolorization: photo-fenten ${\fallingdotseq}$ $UV/TiO_2/H_2O_2\;>\;UV/TiO_2\;>\;fenton\;>\;UV/H_2O_2$. The Photo-lenten and $UV/TiO_2/H_2O_2$ processes seem to be appropriate for decolorization and COD removal of dye wastewater.

• 상하수도학회지
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• 제22권5호
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• pp.581-587
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• 2008

In this study, we investigated the buffering effect with different COD, $NH_4{^+}-N$ and TP shock loads on the performance of lab-scale Sequencing Batch Reactor(SBR) using synthetic wastewater. This study was operated under the following conditions : HRT, 12 hrs : MLSS, 2,000 mg/L : F/M ratio, $0.2kgCOD/kgMLSS{\cdot}d$ : SRT, 20days, and was increased by a factor, COD : ranging from 200-2000 mg/L, $NH_4{^+}-N$ : ranging from 30-300 mg/L, T-P : ranging from 5-50 mg/L in the reactor. As results, COD removal rate at different shock loads was decreased until 42.1%(stable state : 95%) and concentration with effluent was higher than 695 mg/L(at Run 6). In case of $NH_4{^+}-N$ removal rate was decreased until 35.8% from 97.0% and also T-P removal rate was decreased until 5.0%. Effluent concentrations of COD, $NH_4{^+}-N$ and T-P were rapidly increased according to shock loads and needed 3, 4 and 6 additional cycle times for recovering the stable condition.

• Environmental Engineering Research
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• 제23권1호
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• pp.114-119
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• 2018

Yarn dyed wastewater has to be treated prior to disposal into the water bodies due to its high content of harmful organic compounds. In this study, the performance of Chemical Oxygen Demand (COD) removal and kinetic rate constant are investigated via hybrid electrocoagulation-Fenton in a continuous system using wastewater discharged from a yarn dyed industry in Surabaya city. The wastewater was treated in a batch mode using electrocoagulation to reduce Total Suspended Solid, followed by Fenton method in a continuous system to reduce COD level. Various Fe(II) feeding modes, molar ratio of $Fe(II)/H_2O_2$, initial pH of wastewater, and flow rate are used in this study. The results show that COD removal process obeys a pseudo-first order kinetics. At $Fe(II)/H_2O_2$ ratio of 1:10, initial wastewater pH of 3.0, and feed flow rate of 30 mL/min, the COD removal efficiency was observed to be 80%, and the kinetic rate constant is $0.07046min^{-1}$. The chemical cost for the treatment estimated to be IDR 160 per L wastewater, which is cheaper than the previously reported batch system of IDR 256/L.

• 한국응용과학기술학회지
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• 제23권4호
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• pp.273-279
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• 2006

Water quality has been deteriorated by the increasing amount of industrial waste water that is due to the better standard of living. In order to lessen the polluted water and substantially reutilize it at factories, a new method is needed. The plasma generator, which uses discharge current below 1,500 voltage and processes at extremely low temperature, has more strong oxidization than current method and an advantage of miniaturizing the apparatus in dealing with waster water by producing carrier gas at room temperature. This study were measured on the 3 kinds of waster water to the plasma generator for 120 minutes. As results, COD was almost decreased and removed in 15 minutes. The results suggest that the plasma generator can be used reduce COD and removal of color for various waster water, which can be reutilized as industrial water, It would be of benefit to the country like Korea in which qualified water is deficient.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2000년도 추계학술발표대회 및 bio-venture fair
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• pp.469-472
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• 2000

4종의 각 개별균주와 6가지 2균주조합별 실험을 실시한 결과 개별균주의 경우 평균 15%로 낮은 COD제거율을 보였다. 2균주조합의 경우는 NAR3A와 NBY3A가 50.3%로 가장 우수하게 나타났으며 평균 34.9%의 제거율을 보였다. 이러한 제거율은 단일균주에 비해 약 20%향상된 수치로서 단일균주 보다는 2균주조합에 의한 것이 보다 효율적인 것으로 나타났다. 반월의 염색단지 내 폐수처리장의 폐수를 이용하여 실험한 결과 거의 비슷하게 낮은 색도제거율을 나타냈다. 이는 본 연구에 이용된 균주의 경우 단일염료의 색도를 제거하는 실험에 의해 선별되어 다양한 성상의 염료가 함유되어 있는 실제폐수의 염료를 분해하기 힘들었기 때문이다. COD제거의 경우는 비교적 우수한 효율을 나타냈다.

• 한국환경보건학회지
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• 제19권4호
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• pp.38-43
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• 1993

The characteristics of food wastewater treatment in an anaerobic packed bed reactor (APBR) with polyurethane as a packing material and sludge bed reactor (ASBR) was studied. The reactor of 9cm-ID, 150cm-height was fed in a continuous mode from bottom of reactor. For the purpose of constant temperature of reactor, water jacket was installed. The used packing materials was polyurethane sponge foam. Methane which was produced by decomposed organics collected at the top of the reactor for using as a fuel. The substrates used were synthetic, mixed and food wastewater. For the acclimatization of microorganisms, mixed wastewater was used. The major analyses were gas production, COD, pH and volatile acids. Based upon the completed works, the results are as follows: When food wastewater was fed the quantity of produced gas was less than that of synthetic wastewater, but food process saw higher methane content than synthetic process. As well as COD removal efficiency of food process reached at about 85%. In aspect of effluent volatile acid, food process showed low concentration of below 500 mg/l, therefore anaerobic reaction stabled. Conclusively food wastewater used can be digested by anaerobic treatment, especially anaerobic packed bed reactor showed 82% of COD removal, 75% of methane content, 10 l of gas production, and anaerobic sludge bed reactor did 79% of COD removal, 75% of methane content, 81 of gas production at 4 kgCOD/m$^3$day, 36$\circ$C.