• 한국양식학회지
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• 제10권4호
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• pp.435-438
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• 1997

전기분해를 이용한 해수의 암모니아성 질소 및 대장균 제거에 효과적이었다. 암모니아의 제거효율은 전류의 세기가 클수록, 반응 시간이 길수록, 극판간격이 좁을수록 증가하였다. 해수내 250/100 m\ell$의 대장균은 모든 실험 조건에서 검출되지 않아, 살균 목적으로 전기분해가 매우 효과적이었다. 암모니아의 제거 효율은 잔류 염소의 농도에 따라 증가하였다. 암모니아의 제거 효율과 잔류 염소와의 관계는 다음과 같다.$NH_4^+-N(%)=4cdotlog[Residual\;chlorine(mg/\ell)+28(r=0.892)$

• 상하수도학회지
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• 제20권6호
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• pp.875-883
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• 2006

The carbon and nitrogen removal process using PVA-gel (Polyvinyl Alcohol) immobilized microorganisms was studied. The process has been operated under diverse process conditions for 12 months. The process consists of denitrification with internal recycle of 300%, nitrification, aerobic digestion reactors and settling tank. Nitrificatoin and nitrogen removal efficiency according to gel packing ratio and temperature were studied. Yield for Heterotrophs ($Y_H$), decay coefficient for Heterotrophs($b_H$) in aerobic digestion reactor were determined to seize sludge reduction mechanism and compared with typical data of activated sludge process. Then SRT in aerobic digestion reactor was determined on an experimental basis and sludge reduction efficiency was calculated. The process was implemented successfully with sludge reduction efficiency of 92.0~98.5% on a basis of biomass.

• 상하수도학회지
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• 제24권1호
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• pp.73-83
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• 2010

This study was performed to increase the removal efficiency of the biofilter packed with granular sulfur in municipal wastewater reclamation facility. Constituent units were influent water tank, denitrification tank, BOD reduction tank and outlet. And, the major operation factor is a biofilter packed with submerged granular sulfur. Actual wastewater and synthetic wastewater were used as influent wastewater. Experimental condition was divided into two phases according to the amount of a phosphorus coagulant. Total phosphorus removal efficiency was insignificant at mode I that phosphorus coagulant was not injected. The average influent and effluent total phosphorus concentrations at mode II were 0.5 ~ 1.0 mg/L and 0.27 mg/L, respectively. As for COD and BOD effluent concentrations, COD was 3.0 mg/L and BOD was 1.0 mg/L. Additionally, nitrogen removal rates were high at low influent DO concentration. In conclusion, a new process, biofilter packed with granular sulfur is expected to treat high-rate nitrogen wastewater and expected to be utilized as an alternative of technological innovation for the nitrogen treatment.

• 한국환경과학회지
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• 제28권7호
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• pp.629-637
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• 2019

The purpose of this study was to evaluate the effect of high-salinity wastewater on the microbial activity of Aerobic Granule Sludge (AGS). Laboratory-scale experiments were performed using a sequencing batch reactor, and the Chemical Oxygen Demand (COD), nitrogen removal efficiency, sludge precipitability, and microbial activity were evaluated under various salinity injection. The COD removal efficiency was found to decrease gradually to 3.0% salinity injection, and it tended to recover slightly from 4.0%. The specific nitrification rate was 0.043 - 0.139 mg $NH_4{^+}-N/mg$ $MLVSS{\cdot}day$. The specific denitrification rate was 0.069 - 0.108 mg $NO_3{^-}-N/mg$ $MLVSS{\cdot}day$. The sludge volume index ($SVI_{30}$) ultimately decreased to 46 mL/g. The specific oxygen uptake rate decreased from an initial value 120.3 to a final value 70.7 mg $O_2/g$ $MLVSS{\cdot}hr$. Therefore, salinity injection affects the activity of AGS, causing degradation of the COD and nitrogen removal efficiency. It can be used as an indicator to objectively determine the effect of salinity on microbial activity.

• 한국환경보건학회지
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• 제26권4호
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• pp.9-14
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• 2000

In this study, the removal efficiencies of organics, nitrogens and phosphorus from municipal wastewater using $A^2$/O process were investigated. BO $D_{5}$ removal efficiencies were indicated 95% and 94% with HRT of 12 hr and 10 hr, respectively. CO $D_{Cr}$ average removal efficiency and concentration of effluent were indicated 87% and 34mg/$\ell$. SS average removal efficiency and concentration of effluent were indicated 93% and 4~17mg/$\ell$. T-N removal efficiency and concentration of effluent were shown as 60~80% and below 15mg/$\ell$. In aerobic basin, removal efficiency of N $H_4$-N was shown over 97% with N $H_4$-N volume load 0.16kg N $H_4$-N/㎥.d and in anoxic basin, denitrification efficiency was indicated over 80% with return sludge rate 0.5Q and internal recirculation rate 2.5Q. Removal efficiency and effluent concentration of phosphorus were shown over 80% and below 2 mg/$\ell$ with return sludge rate 0.5Q.Q.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2000년도 춘계학술발표대회
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• pp.361-364
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• 2000

To remove nitrogen compound from wastewater six kinds of bacillus were isolated from sludge. Each bacillus was identified as B. subtillis $I{cdot}II$, B. cereus $I{cdot}II$, B. anthracis, B. circulans. The test of effect of nutrient and cofector on the nitrogen removal showed that peptone, yeast extract, magnesium, iron, and calsium accerated the efficiency of nitrogen removal. In syringe test aerobic nitrification and denitrification was occured.

• 한국환경보건학회:학술대회논문집
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• 한국환경보건학회 2003년도 Challenges and Achievements in Environmental Health
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• pp.147-149
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• 2003

Automatic monitoring and controling system, especially DO and MLSS was faciliated for the nitrogen and phosphorus removal efficiencies. Removal efficiency of nitrogen and phosphorus by automatic monitoring and controling system, especially DO and SRT was have well adopted. and so it will be possible to use artificial intelligence logic control software such as fuzzy or neuro logic control system for WWT Plant.

• 한국연초학회지
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• 제33권1호
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• pp.16-20
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• 2011

This study was carried out in order to improve the Mohr method for protein-nitrogen concentration determining. Existing Mohr's method takes seven hours to analyze for one sample. In order to make up for these things tried to utilize filter bag(F75, ANKOM) for sample treatment. As a result of this implementation, have saved sample loss amount and analyzing time for a quarter comparing with Mohr's method. In addition, it have gotten high efficiency through five samples hydrolyze per one trial by using ANKOM hydrolysis system with 0.5% acetic acid. Besides, had a good reproducibility for analysis results in relation to nitrogen concentration determining with Dumas methodology. Thus, new Mohr's method takes one day to analyze for 40 sample. It is more efficiency about 6 times compare with existing Mohr's method. And, this modified Mohr's method was verified that is substitutable for the existing Mohr's method in statistical analysis.

• 대한환경공학회지
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• 제27권11호
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• pp.1222-1227
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• 2005

대표적인 질소제거 시스템인 무산소-산소공정을 대상으로 주어진 유입수 수질 조건에서 최대의 질소제거를 위한 최적의 슬러지 반송비를 질화/탈질 반응식을 이용하여 양론적으로 계산하였다. 양론적 계산에 고려된 수질 항목은 질화/탈질에 영향을 미치는 암모니아성 질소, 질산성질소, 알칼리도, COD, 용존산소로 설정하였다. 최대의 질소제거를 위한 최적의 슬러지 반송비를 앞의 5가지 유입수 항목으로 나타내었다. 양론적 계산에 의한 각 공정의 유출수와 최종 유출수 중의 TN농도가 실제 보고된 하 폐수 처리장의 TN농도와 잘 일치 하였다. 또한 양론적 계산에 의해 실제 처리장 최종 유출수 중의 TN농도를 ${\pm}5.0\;mg/L$ 내에서 예측 가능하였다.

• 한국방재학회 논문집
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• 제8권3호
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• pp.165-169
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• 2008

대부분의 하수처리장에서는 동절기에 수온저하로 인한 질산화 미생물의 활동저하 때문에 질소제거에 어려움을 많이 겪고 있다. 본 연구에서는 이러한 문제점을 해결하기 위하여 하수처리 시뮬레이션 프로그램인 GPS-X를 사용하여 각조의 HRT를 변화시켜 저 수온시 효율적인 질소제거를 위한 HRT의 조합을 도출하고자 하였다. 본 연구에서 도출한 최적의 HRT 조합은 0.3 hr/0.5 hr/1.36 hr/4.84 hr(PreAx/An/Ax/Ox)이고 이때의 T-N 제거율은 51.4%, $NH_4^+$-N는 57.3%의 제거율을 보였다.