• 한국물환경학회지
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• 제30권5호
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• pp.503-511
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• 2014

The temporal and spatial analyses of total nitrogen (TN) fractionation were conducted in order to understand 1) total nitrogen components in streams and 2) their patterns in rainy and dry seasons. The result showed that the concentration of nitrogen components in stream water was lower in non-urban area and getting higher in urban area. Dissolved total nitrogen (DTN) was 95~97.7% of total nitrogen in streams, and the proportion of dissolved organic nitrogen (DON) and ammonia nitrogen ($NH_3-N$) was higher with increasing urban area. The concentration of total nitrogen and nitrate nitrogen ($NO_3-N$) were highest in winter among four seasons. The result was showed that concentration of $NH_3-N$ was same variation as concentrations of TN and $NO_3-N$ in urban-rural complex and urban areas, except rural areas. During rainy season, concentrations of particulate organic nitrogen (PON) and $NH_3-N$ increased in rural areas and decreased in both urban-rural complex and urban areas. Correlation between total nitrogen components and land uses was positively correlated with site > paddy, and negatively correlated with forest. The variation of total nitrogen concentration was determined by $NO_3-N$ in non-urban areas, by $NO_3-N$ and $NH_3-N$ in urban-rural complex and by $NH_3-N$ in the urban areas.

• 한국연초학회지
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• 제12권2호
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• pp.91-101
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• 1990

A field experiment was conducted to find out the effects of field productivity, variety and nitrogen rate on the yield, quality, chemical constituents and physical properties of burley cured leaf in three field with different productivity(Degree of field productivity: A ; high, B ; medium, C : low) during successive two years(1988~89). The yield and quality were remarkably lowered when nitrogen fertilizer being applied much in low productive field. As compared with Burley 21, KB101 showed high yield, particularly the yield of KB101 in low productive field was relatively high. The effect of nitrogen rate on the yield was somewhat different according to field productivity and production year. When the nitrogen fertilizer being applied above 22.5kg/10a, the added nitrogen had no effect on the yield. Total nitrogen content of cured leaf grown in low productive field was high while total alkaloid was low, therefore total alkaloid/total nitrogen ratio was remarkably low. The lightness, red and yellow color of cured leaf grown in low productive field was remarkably low. As compared with Burley 21, the contents of total alkaloid and total nitrogen and shatter resistance index of cured leaf was somewhat low, while the filling power, lightness, red and yellow color were slightly high. Total nitrogen content of cured leaf was increased remarkably by nitrogen addition, but total alkaloid was not increased though the nitrogen fertilizer being applied above 22.5kg/10a. The filling power and shatter resistance index of cured leaf grown in high nitrogen plot, and the lightness and yellow color were low while the red color was relatively high. It comes into question that the visual quality being increased as well as increment of yield and nitrogenous compounds by nitrogen addition in high productive field. In low productive field, it is considerable that nitrogen addition for high yield should be prohibited because it causes the decrement of yield and quality, on the contrary.

• 한국산업융합학회 논문집
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• 제5권3호
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• pp.213-218
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• 2002

Total nitrogen is a major pollutant which mostly causes eutrophication and red tide. Wastewater effluent from printing of cotton-viscose rayon containing high concentrations of total nitrogen can not be effectively treated with a typical biological treatment process. This paper provides a new treatment process and experimental results for the removal of high strength nitrogen from dyeing wastewater. The optimum conditions of air stripping for the removal of total nitrogen include around pH 12, temperature $60^{\circ}C$ with 60 minutes of stripping time. In case of a filtration-air stripping process, an initial level ($500mg/{\ell}$) of total nitrogen was significantly reduced to below $60mg/{\ell}$. Deconite was synthesised for further decomposition of organic nitrogen. Thus, a filtration-decomposition-air stripping process was possibly achieved, by which a high level ($900mg/{\ell}$) of total nitrogen was effectively removed to below $60mg/{\ell}$ P. Finally, a continuous new process for the removal of total nitrogen is proposed and confirmed, based on batch experimental results, and its process validity is further discussed throughout.

• 한국환경보건학회지
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• 제28권5호
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• pp.1-3
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• 2002

This study was to evaluate on the removal efficiencies of total nitrogen and phosphorus in municipal wastewater at MUNR process using sludge carbon source for environmental micro-organism. The removal efficiencies of total suspended solid were 85.9~91％, total nitrogen were 38.6~87.2％ and total phosphorus were 30.8~39.0％, respectively. It was shown that removal efficiency of nitrogen was effectively influenced by sludge carbon source treated with ultrasonication. The removal efficiency of total phosphorus was low because the sludge was not wasted during this treatment.

• 한국연초학회지
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• 제1권2호
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• pp.120-126
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• 1979

목포, 남원, 예산지방에서 각각 재배한 Burley 엽중의 nitroate form nitrogen, alkaloid form nitrogen, ammonia form nitrogen, protein form nitrogen과 form nitrogen의 함량을 조사하였다. Total nitrogen 중에서 protein form nitrogen이 차지하는 비율이 30-33%로써 가장 높았고, nitrate form nitrogen이 10∼23%, alkaloid form nitrogen이 8∼16%, ammonia form nitrogen이 6∼9%, 그리고 amide form nitrogen이 2∼2%였다. Nitrate form nitrogen의 함량 비율은 예산, 남원, 목포 순으로 증가하는데 반하여 alkaloid form nitrogen은 반대되는 현상을 보였다. 등급에 따라서는 alkaloid form nitrogen과 ammonia form nitrogen의 함량 비율의 순위는 H5>3>L1>3>5이였으며 nitrate form nitrogen은 이와 반대되는 경향이었다.

• 한국환경농학회지
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• 제7권2호
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• pp.146-152
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• 1988

도시 폐기물의 퇴비화 과정중 퇴비중의 질소 화합물 함량을 시기별로 조사한 결과 다음과 같다. 1. 총 질소, 유기성 질소 및 미생물 이용 가능 질소 함량은 거의 변화가 없었으며 미생물 이용 불가능 질소 함량은 약간 증가하였다. 그러나 총 질소, 유기성 질소 및 미생물 이용 가능 질소의 유효성분 함량은 감소하였으며 미생물 이용 불가능 질소의 유효성분 함량은 거의 일정하였다. 2. 암모늄태 질소 함량은 초기에 높았다가 퇴비화가 진행됨에 따라 감소 하였으며 이적을 한 후에는 다시 증가하다가 감소하였다. 3. 질산태 질소 함량은 암모늄태 질소 함량과 반대 경향을 보였다. 4. 유기물 중 유기성 질소 함량은 증가하였으며 초기에는 완만한 증가현상을 보이다가 9주와 21주 사이에 급격히 증가하였다. 5. $F{\"{o}}rster$ 방법에 의한 총 질소 함량이 Kjeldahl 방법에 의한 것보다 높았으며 Kjeldahl 방법에 의한 총 질소 함량이 $F{\"{o}}rster$ 방법에 의한 미생물 이용 가능 질소 함량보다 6% 높았다. 6. 30주 후 총 질소 손실량은 Kjeldahl 방법으로 측정한 결과 50% $F{\"{o}}rster$ 방법으로 측정한 결과 48% 이었으며 초기 2주 내에 급격한 질소 손실이 일어났다. 7 Kjeldahl 방법에 의한 총 질소, 미생물 이용 가능 질소, $F{\"{o}}rster$ 방법에 의한 총질소 및 미생물 이용 가능 질소 상호간에 유의적인 정(+)의 상관이 있었다.

• 한국작물학회지
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• 제32권3호
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• pp.347-352
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• 1987

버어리 21을 공시품종으로 하여, 시비량을 전량기비구에서는 표준시비 외 증비 2처리와 기 추비구에서는 표준량을 기비로 하고 추비 2 처리를 두어 질소수준 및 시비방법과 수확시기의 차이가 엽중전질소 및 전알카로이드함량에 미치는 영향을 밝혀서 전질소화합물이 낮은 잎담배를 생산코자 본 시험을 수행하였던 바 그 결과를 요약하면 다음과 같다. 1. 질소 증비에 따라 부풀성이 저하되었다. 2. 질소량을 증시 할수록 성숙이 지연되었고 엽중전질소 및 알카로이드함량도 증가되었으며, 기비 보다도 추비에 의해서 그 영향이 크게 나타났다. 3. 엽중 전질소함량은 적심 전이 가장 높았고, 이후 생육기간이 길수록 감소되었는데 상위엽에서 감소폭이 더 컸다. 4. 엽중 알카로이드함량은 적심기부터 증가하여 생육기간이 길수록 점차 더 증가되었고, 상위엽에서 증자폭이 더 컸다.

• 상하수도학회지
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• 제21권3호
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• pp.295-303
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• 2007

Nitrogen compounds in municipal wastewater can be divided into biodegradable and nonbiodegradable fractions with biodegradability. Biodegradable nitrogen compounds can be removed through biological nitrification and denitrification processes, and nonbiodegradable nitrogen compounds affect the effluent quality of biological nutrient removal processes. The amount of nitrifiable nitrogen compounds, which are the sum of ammonia and biodegradable organic nitrogen, has been estimated by respirometry. Respirometry shows good estimation of the concentration of nitrifiable nitrogen when a synthetic sample of ammonium chloride is dosed. The estimated concentration of nitrifiable nitrogen compounds in municipal wastewater is close to ammonia concentration in municipal wastewater, but it is lower than that for the synthetic sample. If nitrogen assimilated into cell synthesis of nitrifiers and heterotrophs is considered, the total amounts of nitrifiable nitrogen compounds, which are nitrified and assimilated, could be more accurately estimated. The concentration of nitrifiable nitrogen compounds, which are biodegradable, is about 31 mg N/l, and this is 119% of ammonia and 94% of total nitrogen. Ammonia, nitrate, biodegradable organic nitrogen, and nonbiodegradable nitrogen are about 79%, 1%, 15%, and 5% of the total nitrogen in municipal wastewater, respectively.

• 한국토양비료학회지
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• 제50권2호
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• pp.100-105
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• 2017

Various methods for assessing soil total nitrogen (TN) and inorganic N content have been developed to manage nutrient and to understand N cycle in soil. This paper address the technical procedures in arable soil samples to conduct soil sampling, sample preparation, and measuring total N and inorganic N. Among various methods for measuring soil total nitrogen contents, Kjeldahl distillation and Indophenol blue method have widely used due to reliability and economic advances. Also, two methods can analyze more samples at the same time compared with other nitrogen measuring methods. For evaluating inorganic N content, mainly in forms of nitrate-N ($NO_3{^-}-N$) and ammonium-N ($NH_4{^+}-N$), extraction with a single reagent such as 2M KCl has been employed, followed by Kjeldahl distillation or indophenol blue methods.

• 한국환경보건학회지
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• 제28권1호
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• pp.93-97
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• 2002

The aim of this study was to evaluate on the removal effect of total nitrogen and phosphorus with municipal wastewater in ultrasonic nutrient removal (UNR) process using ultrasonic sludge carbon source. The removal efficiency for total nitrogen was 44.2% at biological nutrient removal (BNR) process, 50.8% at UNR process. The removal efficiency for total phosphorus was 45.6% at BNR process, 46.2% at UNR process. The removal of nitrogen was effectively influenced by ultrasonic sludge carbon source.