• 한국환경보건학회지
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• 제35권1호
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• pp.64-70
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• 2009

The aims of this study is to examine the effects of the changes in HRT(Hydraulic Retention Time) and media charge in a water-mill, among other operation factors, on the nitrogen and phosphorus removal in order to use up-flow anaerobic reactors, anoxic reactors and water-mill aerobic reactors for sewage treatment. The extension of HRT improved the nitrogen removal efficiency, however the removal pattern was constant regardless of HRT. The removal of phosphorus was constant (80%-90%) regardless of the change in HRT. The removal rate with change in influx load varied such that at the OLR (Organic Load Rate) of 1-3 kg/d, the T-N removal efficiency was 80.7%-88.9% and the T-P removal efficiency was 82.9%-89.3% while at the NLR (Nitrogen Loading Rate) of 0.108-0.156 kg/d the removal efficiencies were 80.7-88.9% (T-N) and 82.9-89.3% (T-P). The analyses of the nitrogen and phosphorous removal characteristics with the C/N and C/P ratio showed that the mean T-N removal rate was 88% at the C/N ratio of 1.2-2.6, and that the mean T-P removal rate was 86% at the C/P ratio of 7.2-14.1. Also, the analysis of nitrogen and phosphorous removal characteristics were analyzed in relation to media charge. The comparison between with and without media charge in the water-mill showed that while the nitrogen removal efficiencies were 86-94% and 85-89% respectively, the difference of phosphorous removal efficiencies were between the two conditions was not significant, thus it suggested that the media charge has less effect on the removal efficiency of phosphorous compared to that of nitrogen.

• 한국수산과학회지
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• 제26권2호
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• pp.173-181
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• 1993

아산만에서 영양염 및 입자성 유기물의 계절적 변화를 조사하였다. 영양염은 8월에 높고 2월에 낮았으며 무기 질소와 인산 인의 원자비는 5월의 24.8을 제외 하고는 Redfield ratio와 유사하였다. 5월에 인산 인을 제외한 다른 영양염들은 염분이 $31.5{\sim}32.0\%0$까지는 염분이 증가할수록 감소하였으나 그 후 다시 증가하여 하구 내에서 영양염 공급이 있음을 시사해주고 있다. 그러나 8월의 조사에서 영양염과 염분이 좋은 역상관 관계는 이 시기에 영양염 공급원이 담수 유입으로 추정된다. chlorophyll a 농도는 5월에 최대이었고 조사시기 동안 Rb/Ra(Rb: fluorescence before acidification, Ra: fluorescence after acidification) 비가 비교적 낮아 조사해역의 식물플랑크톤이 생리적으로 성장하기에 나쁜 환경에 있는 것으로 사료된다. 입자성 유기 규소(PBSi)와 입자성 유기탄소(POC)의 비가 낮고 PBSi/chlorophyll a 비 및 POC/chlorophyll a 비가 상대적으로 높아 아산만에서 저층으로부터 많은 non-living detritus의 공급이 있는 것으로 판단된다.

• 한국환경복원기술학회지
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• 제18권5호
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• pp.37-48
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• 2015

Soil nutrient management is important to maintain the constant productivity of seedling production in the nursery for successful forest restoration. This study investigated the effects of organic manure and chemical fertilizer application levels on the growth, soil properties, and nutrient concentrations of yellow poplar seedlings. One-year-old yellow poplar seedlings were treated with the combination of 3 level organic manures(0, 5 Mg/ha, 10 Mg/ha; mixture of poultry manure, cattle manure, swine manure, and sawdust) and 3 level nitrogen-phosphorus-potassium(NPK) chemical fertilizers(0, 1x(urea, $30g/m^2$; fused superphosphate, $70g/m^2$; potassium chloride, $15g/m^2$), 2x). Organic manure significantly increased the soil pH and the concentrations of nitrogen, available phosphorous, exchangeable potassium, calcium, and magnesium. In contrast, the NPK chemical fertilizer decreased the soil pH and exchangeable calcium concentration, did not affect the soil concentrations of nitrogen and magnesium, and increased the concentrations of available phosphorous and exchangeable potassium. Both organic manure and NPK chemical fertilizer treatments increased the seedling height, root collar diameter, and dry weight by 39% and 25%, respectively. The treatment with manure 5 Mg/ha and NPK 2x chemical fertilizer mostly increased seedling dry weight by 2.6 times more than that of the control. Compared to the effects of the fertilization treatments on the soil properties, the effects on nutrient concentrations in the leaves were relatively small. These findings indicate that organic manure that was derived from livestock byproducts and sawdust can be utilized with chemical fertilizer to improve seedling production as well as conserving soil quality.

• 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.739-746
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• 1999

Discharge characteristics of organic materials and nutrients were estimated in the catchment area of relaimed area-Saemankeum-. Discharge load of BOD5 was high in the domestic system, while nitrogen and phosphorous were discharged mainly from the livestock system and the land . Load was so dependent on the precipitation that it increased in the rainy season, particulary in nitrogen and phosphorus. Loads from nonpoint sources in this area were higher compared with others.

• 미생물학회지
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• 제27권4호
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• pp.373-377
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• 1989

The effects of environmental factors on the extracellular release of organic carbon by Scenedesmus qudricauda were studied. The PER (percentage extracellular release) was greater at high temperature and at high concentration of nitrogen and phosphate. The PER variation according to the change of M/P ratio showed high values at each extreme N/P ratio. This result suggested that the limitation of nitrogen or phosphorous resulted in the accumulation of carbohydrates as photosynthetic products, and the products in high concentration were excreted through algal cell membrane.

• 한국환경복원기술학회지
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• 제14권1호
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• pp.43-55
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• 2011

This study was carried out to analyze vegetation, soil characteristic, and ordination of the Young-bong region in Woraksan National Park. Communities by species in Woraksan forest were composed of Quercus mongolica community group. This community group was classified into Pinus densiflora community, Quercus variabilis community, Carpinus cordata community and Quercus mongolica community. In the study, it was found that the composition of organic matter was 9.6~19.6%, nitrogen (0.3~0.7%), available phosphorous (4.5~8.8mg/kg), exchangeable K ($0.3{\sim}0.5cmol^+/kg$), exchangeable Ca ($1.6{\sim}6.75cmol^+/kg$), exchangeable Mg ($0.8{\sim}1.55cmol^+/kg$), cation exchange capacity (C.E.C.; $7.6{\sim}32.95cmol^+/kg$), and pH was 4.5~5.1 respectively. The Carpinus cordata community were mostly found in high elevation and high percentage of total nitrogen, C.E.C., and organic matter. Controversially, Pinus densiflora community and Quercus variabilis community were found mostly in low elevation and low percentage of total nitrogen, C.E.C., and organic matter. The Quercus mongolica community were found in medium elevation and medium percentage of total nitrogen, C.E.C., and organic matter.

• 대한환경공학회지
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• 제27권11호
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• pp.1198-1204
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• 2005

본 연구는 메탄산화균을 분리 배양하여 생물학적 질소 및 인 제거에 응용하는데 있다. 수도권 매립지의 상부 토양으로부터 NMS (nitrate mineral salt solution)배지로 분리 배양된 메탄산화균을 이용하여 영양염 제거 및 성장특성을 분석하였다. 분리 배양된 메탄산화균은 탈질의 탄소원으로서 이용될 수 있는 메탄올, 포름알데히드, 포름산으로 구성된 상당한 양의 유기물(COD 증가)을 생산하였다. 이때 메탄올의 생성속도는 $8\;mg/L{\cdot}hr$로 나타났다. 메탄산화균의 슬러지에 함유되어 있는 질소와 인의 함량을 볼 때 메탄산화균은 탈질에 필요한 탄소원 생성 뿐만 아니라 자체적으로 질소와 인을 성장기질로서 사용하는 것으로 나타났다.

• 한국환경복원기술학회지
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• 제9권6호
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• pp.78-85
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• 2006

This study was to analyze vegetation and soil characteristic, and ordination of Bupleurum latissimum community located in Seo-Myun, Isl. Ulleungdo. The Bupleurum latissimum community was classified into Physocarpus insularis subcommunity and Artemisia stolonifera subcommunity, and there was Artemisia stolonifera subcommunity in destroyed site of Bupleurum latissimum community. In the study sites, soil organic matter, nitrogen, available phosphorous, changeable potassium, changeable calcium, changeable magnesium concentration, cation exchangeable capacity, and soil pH were ranged from 19.0~25.6%, 0.67~0.96%, 47.8~103.0ppm, 2.4~2.8(me/100g), 13.8~15.0(me/100g), 8.4~9.0 (me/100g), 34.0~38.4(me/100g), and 5.9~6.0, respectively. The Bupleurum latissimum community had higher nitrogen, exchangeable magnesium, and available phosphorous concentration than in Bupleurum euphorbioides and Bupleurum longiradiatum community. The Berberis amurensis var. latifolia and Valeriana officinalis var. latifolia that was companion species of Bupleurum latissimum community was found in area of having high soil organic matter and nitrogen concentration. The Ligustrum foliosumwas found in shrubbery, and so the reason could give little competition with Bupleurum latissimum community. The Bupleurum latissimum is the endangered species managed by Ministry of Environments in Korea. Its community has been destroyed, and so we need any action to protect the community.

• 한국토양비료학회지
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• 제44권2호
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• pp.236-241
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• 2011

경남지역 과수원 토양 25개소를 대상으로 2010년에 토양 화학성분과 미생물 다양성을 검토하고 토성, 지형 및 작물별 주요 변동요인을 주성분분석으로 해석하였다. 토양 유효인산 및 치환성 칼륨 함량은 적정수준 보다 각각 2.6배 및 2.3배 높았으며 대부분 토양 화학성분의 최소값과 최대값 차이가 크게 나타났다. 지형적으로 산록경사지는 토양 유효인산 함량이 유의적으로 높았고 (p<0.05) 미사질양토에서 곰팡이와 형광성 슈도모나스균 개체수가 사양토 보다 유의적으로 높았다 (p<0.05). 주성분 분석결과 제 1주성분이 28.4%, 제 2주성분이 20.1%로서 전체 48.5%의 자료를 설명할 수 있었으며 제 1주성분은 토양의 세균 개체수가 가장 크게 기여하였다. 토양 유기물 함량은 곰팡이 개체수와 정의상관을 보인 반면 세균 개체수와 부의상관을 나타냈다.

• 한국산림과학회지
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• 제97권3호
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• pp.296-304
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• 2008

우리나라 노각나무 자생지 가운데 8개 지역을 대상으로 식물사회학적 방법으로 군락을 분류하고, 방형구법을 사용하여 구배분석을 실시하였다. 그 결과 노각나무군락은 고로쇠나무하위군락, 소나무하위군락, 사람주나무하위군락, 노각나무전형하위군락으로 구분되었다. 노각나무는 주로 계곡 주변에 국지적으로 분포하였으며, 토양특성은 유기물, 전질소, 유효인산, 치환성 K, 치환성 Ca, 치환성 Mg, 양이온치환용량(CEC)의 함량이 14.31~34.27%, 0.33~0.77%, 7.83~22.88(mg/kg), 0.23~1.07(me/100g), 0.29~2.93(me/100g), 0.33~1.49(me/100g), 10.47~22.48(me/100g)이며, pH는 4.65~4.96으로 약산성토양인 것으로 분석되었다. 고로쇠나무하위군락은 해발고가 가장 높고, 전질소, 치환성 Ca, Mg의 함량이 높은 입지에 분포하였으며, 소나무하위군락은 해발고가 가장 낮고, 전질소, 치환성 Ca, Mg의 함량이 가장 낮은 입지에 분포하는 것으로 나타났다.