• 한국환경과학회지
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• 제12권7호
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• pp.791-799
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• 2003

This study was carried out to get more operational characteristics of the sequencing batch biofilm reactors with media volume/reactor volume ratio of 15 %, 25 % and 35 %. Experiments were conducted to find the effects of the media packing ratio on organic matters and nutrients removal. Three laboratory scale reactors were fed with synthetic wastewater. During studies, the operation mode was fixed. The organic removal efficiency didn't show large difference among three reactor of different packing media ratios. However, from the study results, the optimum packing media ratios for biological nutrient removal was shown as 25%. The denitrifying PAOs could take up and store phosphate using nitrate as electron acceptor.

• 상하수도학회지
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• 제10권1호
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• pp.78-84
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• 1996

The presence of ammonia, usually in the form of ammonium ion ($NH_4{^+}$), can enhance bacterial growth m the distribution system and make the production of drinking water more costly if ammonium must be removed to ensure good disinfection. Removal of ammonia by biological oxidation could be economical which prevents excess chlorine dosage In this research, effects of hydraulic retention time (HRT) and media type on the ammonia removal efficiencies of submerged biofilm reactor were investigated. The biofilm reactors combined the characteristics of high biological solids capture efficiency and good hydraulic control. The results indicate that biofilms can remove over 77 percent of the ammonia with HRT of longer than 2 hr even at low temperature ranging from 14.6 to $16.6^{\circ}C$. The HRT has a significant effect on nitrification. The overall nitrification and efficiency of ammonia removal increase with increasing HRT. It has also been observed that when the fibrous media was used, the ammonia removal, nitrification rate and endurance to shock improved.

• Biotechnology and Bioprocess Engineering:BBE
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• 제5권1호
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• pp.65-70
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• 2000

An approximated analytical solution of mathematical model for the three phase fluidized bed bioreactor (TFBBR) was proposed using the linearization technique to describe oxygen utilization rate in wastewater treatment. The validation of the model was done in comparison with the experimental results. Satisfactory agreement was obtained in the comparison of approximated analytical solution and numerical solution in the oxygen concentration profile of a TFBBR. The approximated solutions for three modes of the liquid phase flow were compared. The proposed model was able to predict the biomass concentration, dissolved oxygen concentration the height of efficient column, and the removal efficiency.

• 한국환경과학회:학술대회논문집
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• 한국환경과학회 2018년도 정기학술대회 발표논문집
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• pp.50-50
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• 2018

• 대한설비공학회지:설비저널
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• 제18권3호
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• pp.240-249
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• 1989

• 환경위생공학
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• 제11권2호
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• pp.43-52
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• 1996

Using rotating biological contactor(RBC) with artificial endogenous stage and aerobic fixed biofilm reactor(AFBR), organic material removal and biological nitrification of piggery wastewater has been studied at a pilot plant. RBC was operated in the endogenous phase at a interval of every 25 days. The concentration of COD, BOD and TKN in influent wastewater were from 2,940 to 3,800 mg/L, from 1,190 to 1,850 mg/L and from 486 to 754 mg/L respectively. The maximum active biomass content represented as VSS per unit aera was $2.0mg/cm$^{2}$ and biofilm dry density of $17mg/cm^{3}$ was observed at biofilm thickness of $900{\;}{\mu}m$. It was observed that the pilot scale RBC/AFBR process exhibited 72 percentage to 93 percentage of BOD removal, In order to obtain more than 90 percentage of BOD removal, the organic loading rate to the RBC/AFBR process should be maintained less than $0.09{\;}m^{3}/m^{2}{\cdot}day(125.9g{;\}BOD/m^{3}{\cdot}d$. The TKN removal efficiencies was from 45.5 to 90.9 percentage according to vary influent loading rate, It was estimated that the RBC/AFBR process consumed approximately 6.2 mg/L(as $CaCO_{3}$) of alkalinity per 1 mg/L of $NH_{3}$-N oxidized as the nitrification took piace.

• Environmental Engineering Research
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• 제10권6호
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• pp.283-293
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• 2005

Characteristics of sulfur-based autotrophic denitrification in a semi-continuous type reactor and the kinetic parameters were studied. Enriched autotrophic denitrifying culture was used for the reactor operation. Biomass growth on sulfur particles and in the liquid medium was monitored using the DAPI staining method. From the result of ion concentration changes and the biomass growth, maximum specific growth rate, ${\mu}_{max}$, and the half velocity constant, $K_M$, were estimated as $0.61\;d^{-1}$ and 3.66 mg/L, respectively. Growth yield coefficient, Y values for electron acceptor and donor were found as 0.49 gVSS/g N and 0.16 gVSS/g S. The biomass showed specific denitrification rate, ranging 0.86-1.13 gN/g VSS-d. A half-order equation was found to best simulate the denitrification process in the packed bed reactor operated in the semi-continuous mode.

• 한국물환경학회지
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• 제27권5호
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• pp.646-653
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• 2011

The combined system of sequencing batch biofilm reactor (SBBR) and membrane SBR (MSBR) was operated with sewage to evaluate the COD utilization for biological nutrient removal (BNR). The SBBR was operated for nitrification reactor, while denitrifying PAO (dPAO) was cultivated in MSBR with anaerobic-anoxic operation. In the SBBR and MSBR system, the enhanced biological phosphorus removal (EBPR) was successfully achieved with higher N removal. The COD utilization in combined SBBR-MSBR system was significantly reduced compared to ordinary BNR (up to 3.1 g SCOD/g (N+P) and 1.6 g SCOD/g (N+P) with different C/N/P ratio). The results suggest that a dPAO process could effectively reduce carbon energy (=COD) requirement. The combination of oxic-SBBR and anaerobic-anoxic MSBR for dPAO utilization could be an attractive alternative to upgrade the process performance in weak sewage.

• 대한환경공학회지
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• 제22권10호
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• pp.1789-1797
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• 2000

질산화에 요구되는 산소량과 탈질소화에 요구되는 탄소원의 양을 감소시킬 수 있는 암모니아성 질소의 아질산성 질소로의 부분적 질산화 반응을 유도하기 위해 생물막 반응기를 이용하여 고농도 암모니아성 질소를 함유하고 있는 혐기성 소화슬러지 탈수여액을 대상으로 알칼리도/암모니아성 질소의 농도비, pH, FA(free ammonia), 온도변화에 따른 아질산성 질소의 축적현상에 대한 연구를 수행하였다. 실험결과 유입수의 알칼리도/암모니아성 질소의 농도비를 증가시킴에 따라 유출수의 아질산성 질소의 축적도 증가하였으며, 이는 알칼리도의 농도가 증가함에 따라 반응기내의 pH가 높게 유지됨으로서 FA의 농도가 증가하게 되어 Nitrobacter의 성장을 선택적으로 저해시키기 때문인 것으로 판단된다. 일정한 알칼리도/암모니아성 질소의 농도비 조건에서 온도가 증가할수록 아질산성 질소의 축적도 증가하였다.

• 대한환경공학회지
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• 제22권5호
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• pp.971-980
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• 2000

가용성 메탄산화효소를 분비하는 혼합 메탄자화균총을 celite R-635에 고정화시켜 TCE 분해를 위한 새로운 형식의 가압 산기식 혼합 메탄자화균총 고정층 생물막 반응기를 설계하였다. Celite R-635에서 용출되는 용액의 pH는 약 4시간 후부터 안정화되어서 중성 영역에 도달하므로 더 이상 중화할 필요가 없었다. 혼합 메탄자화균 생물막을 완전히 형성하기 위해서는 130일이 걸렸으며, 처음에 흰색을 띠고 있었던 celite는 점차 붉게 변해 갔었다. 생물막이 형성된 후에는 메탄과 산소를 각각 2.5~4, 8~10 ppm씩 공급할 때 하루 동안 체류한 후 0.5~1, 1~2 ppm 정도로 농도가 낮아졌다. 초기에 2 ppm의 TCE를 메탄자화균 고정층 생물막 반응기에서 10시간 동안 체류시켰을 때 79.9%의 분해 효율을 보였다.