• Title/Summary/Keyword: 용존유기질소

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Distribution of Water Masses and Distribution Characteristics of Dissolved Inorganic and Organic Nutrients in the Southern Part of the East Sea of Korea: Focus on the Observed Data in September, 2011 (동해 남부 해역의 수괴 분포와 용존 무기 및 유기 영양염의 분포 특성: 2011년 9월 관측자료를 중심으로)

  • Kwon, Hyeong Kyu;Oh, Seok Jin;Park, Mi Ok;Yang, Han-Soeb
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.17 no.2
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    • pp.90-103
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    • 2014
  • Distribution characteristics of water masses, dissolved inorganic and organic nutrients were investigated in the southern part of the East Sea of Korea in September, 2011. On the basis of the vertical profiles of temperature, salinity and dissolved oxygen, water masses in the study area were divided into 4 major groups, such as WM (water mass)-I, WM-II, WM-III, WM-IV. Their characteristics were similar to Tsushima Surface Water (TSW), Tsushima Middle Water (TMW), North Korea Cold Water (NKCW) and East Sea Proper Water (ESPW), respectively. In the vertical profiles of dissolved nutrients, dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) concentrations were highest in the WM-IV, followed by WM-III, WM-II, WM-I. On the contrary, distribution of dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) were highest in the WM-I, followed by WM-II, WM-III, WM-IV. Although the DIN : DIP ratio in all of the water masses was similar to Redfield ratio(16), the DIN : DIP ratio in mixed layer was about 5.3, indicating that inorganic nitrogen is the limiting factor for the growth of phytoplankton. However, the DON proportion in dissolved total nitrogen (DTN) was about 70% in the mixed layer where inorganic nitrogen is limiting factor. Thus, enriched DON may play an important source of the nutrient for the growth of phytoplankon in the East Sea.

Effects of Dissolved Organic Nitrogen on the Growth of Dominant Phytoplankton in the Southwestern Part of East Sea in Late Summer (늦여름 동해 남서해역에서 용존 유기 질소가 우점 식물플랑크톤의 생장에 미치는 영향)

  • Kwon, Hyeong-Kyu;Jeon, Seul-Gi;Oh, Seok-Jin
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.22 no.1
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    • pp.42-51
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    • 2016
  • We investigated the distribution of dissolved nutrients, phytoplankton community structure and utilization of nitrogen compounds by dominant species in the southwestern part of East Sea in September, 2014. Dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) were lower in the surface layer, and concentrations were increased with depth. Dissolved organic nitrogen (DON) and dissolved organic phosphorus were the opposite of dissolved inorganic nutrients. Although DIN DIP ratio in all of the water masses was higher than Redfield ratio (16), DIN : DIP ratio in mixed layer was about 2, indicating that inorganic nitrogen is the limiting factor for the growth of phytoplankton. In particular, DON proportion in dissolved total nitrogen was about 88 % in the mixed layer where inorganic nitrogen is limiting factor. The dominant species Chaeotceros debilis and Prorocentrum minimum were able to grow using DIN as well as DON such as urea and amino acids. Therefore, DON utilization of phytoplankton may play a role as a survival strategy in the DIN-limited conditions of East Sea.

Formation of Organic Chloramines during Monochloramination of Natural Organic Matters (천연유기물과 모노클로라민의 반응시 유기성 클로라민 생성)

  • Lee, Wontae
    • Journal of Korean Society of Environmental Engineers
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    • v.36 no.9
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    • pp.604-608
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    • 2014
  • This study investigated influence of dissolved organic nitrogen (DON) in natural organic matter (NOM) on the formation of organic chloramines upon monochloramination. Ratios of dissolved organic carbon (DOC) to DON of the 16 NOM isolates ranged from 7 to 47 mg-C/mg-N. Levels of organic chloramines maxed in 24 hours at $0.16mg-Cl_2/mg-N$ in average. The yields were relatively lower, but decay of organic chloramines were slower than those upon chlorination. Organic chloramines formed upon monochloramination decreased by 56% in average in 120 h. NOM with lower DOC/DON ratios formed more organic chloramines. NOM fractions such as hydrophobic, hydrophilic, transphilic, and colloidal did not significantly impact formation of organic chloramines. As the monochloramine doses increased, more organic chloramines were produced ($R^2=0.91$). Overestimation of disinfection capacity due to the formation of organic chloramines may not be concerns for monochloramine systems since only 6% of monochloramine could be converted to organic chloramines upon monochloramination of NOM.

Dominance and Survival Strategy of Toxic Dinoflagellate Alexandrium tamarense and Alexandium catenella Under Dissolved Inorganic Nitrogen-limited Conditions (용존태 무기질소 제한 하에서 유독와편모조류 Alexandrium tamarense와 Alexandium catenella의 생존과 우점화 전략)

  • Kwon, Hyeong Kyu;Park, Ji A;Yang, Han-Soeb;Oh, Seok Jin
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.16 no.1
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    • pp.25-35
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    • 2013
  • Dominance and survival strategy of toxic dinoflagellate Alexandrium tamarense and A. catenella under the dissolved inorganic nitrogen (DIN) limited conditions were examined in the laboratory and field observations. In Masan Bay, DIN was limiting factor for growth of phytoplankton during spring to early summer when Alexandrium spp. have been observed. They have a disadvantageous position compared with diatoms because Ks of nitrate calculated from growth kinetics experiment of A. tamarense and A. catenella was higher than diatoms. However, A. tamarense and A. catenella were able to grow using dissolved organic nitrogen (DON) compounds such as urea and amino acids as well as DIN. Therefore, DON utilization of A. tamarense, A. catenella might contribute to not only their population growth but also dominance and interspecific competition in the DIN-limited conditions in Masan Bay.

Assessment of the Organic and Nitrogen Fractions in the Sewage of the Different Sewer Network Types by Respirometric Method (미생물 호흡률 측정에 의한 관거시스템 유형별 하수의 기질 분율 평가)

  • Park, Jong-Bu;Hur, Hyung-Woo;Kang, Ho;Chang, Sung-Oun
    • Journal of Korean Society of Environmental Engineers
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    • v.31 no.8
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    • pp.649-654
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    • 2009
  • Respirometric analysis of domestic sewage by measuring oxygen uptake rate(OUR) was carried out for the experimental assessment of the organic and biomass fractions. The data of the organic and biomass fractions in sewage is essential for the activated sludge model to optimize the biological treatment plant. As a result of this study, the fractions of readily biodegradable substrate($S_S$), slowly biodegradable substrate($X_S$), inert soluble substrate($S_I$), inert particular substrate($X_I$) and heterotrophic biomass($X_{HAB}$) were about 26.6%, 41.5%, 8.5%, 14.7% and 8.7% on the basis of chemical oxygen demand($COD_{Cr}$), respectively. And the fractions of nitrogen were also studied. The fractions of soluble nitrate nitrogen($S_{NO}$), soluble ammonia nitrogen($S_{NH}$), soluble nonbiodegradable organic nitrogen($S_{NI}$), soluble biodegradable organic nitrogen($S_{ND}$) and slowly biodegradable organic nitrogen($X_{ND}$) were about 3.7%, 64.9%, 4.7%, 9.4% and 17.4%, respectively.

Removal of Dissolved Organic Nitrogen from Surface Water and Reclaimed Water by Coagulation (지표수 및 재이용수내 용존 유기질소의 응집처리)

  • Lee, Wontae;Choi, June-Seok;Oh, Hyun Je
    • Journal of Korean Society of Environmental Engineers
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    • v.34 no.11
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    • pp.729-734
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    • 2012
  • During chlorination processes dissolved organic nitrogen (DON) can form toxic nitrogenous disinfection byproducts and organic chloramines which have little or no bactericidal activity. DON needs to be removed before chlorination processes to reduce the formation of those products. This study investigated the removal of DON from surface water and reclaimed water by coagulation with aluminum sulfate (alum) and a cationic polymer (polyDADMAC). Removal characteristics of dissolved organic carbon (DOC) and ultraviolet absorbance at 254 nm ($UVA_{254}$) were compared with that of DON. Coagulation with alum removed DON, DOC, and $UVA_{254}$ with similar trends, but the removal of $UVA_{254}$ was highest. A dual coagulation strategy of alum and cationic polymer improved the removal of DON. Coagulation with cationic polymer alone was not effective due to its narrow range of charge neutralization. DON in reclaimed water was easier to remove than that in surface water, and higher molecular weight fraction (>10,000 Da) of DON was preferentially removed.

Influence of Dissolved Organic Nitrogen on Organic Chloramine Formation during Chlorination (염소 소독시 DON이 유기성 클로라민 생성에 미치는 영향)

  • Lee, Won-Tae
    • Journal of Korean Society of Environmental Engineers
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    • v.33 no.7
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    • pp.481-484
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    • 2011
  • Although formation of organic chloramines have been studied for decades, most of them have involved model organic compounds (e.g., amino acids) but not naturally occurring organic nitrogen in water. This study investigated formation of organic chloramines during chlorination of 16 natural organic matters (NOM) solutions which were isolated from surface water and contained dissolved organic nitrogen (DON). Organic chloramine yields per chlorine consumption was $0.25mg-Cl_2/mg-Cl_2$. Upon chlorination of NOM solutions, organic chloramines were rapidly formed within 10 minutes. The average organic chloramine yields upon addition of chlorine in to NOM solutions were $0.78mg-Cl_2/mg-DON$ at 10 minutes and $0.16mg-Cl_2/mg-DON$ at 24 hours. Organic chloramine yields increased as the dissolved organic carbon/dissolved organic nitrogen (DOC/DON) ratios decreased. Chlorination of molecular weight (10,000 Da) fractionated samples showed that the influence of DON molecular weights on the organic chloramine formation was minimal.

함안군 강변여과수 지역의 철.망간 산화-환원 특성 연구

  • Park Seong-Min;Kim Jin-Hun;Seo Min-U;Kim Hyeong-Su
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2005.04a
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    • pp.94-98
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    • 2005
  • 강변여과방식의 시험 취수가 진행 중에 있는 범람원지역의 산화-환원 반응을 밝히기 위해 10개의 간이 관측정을 설치하여 수질 모니터링을 수행하였다. 분석 결과 하천수에 인접한 지역에서 강한 환원환경이 생성되는 것을 확인하였으며, 이는 하천수 내 용존 유기 탄소가 인근 범람원 지역에 퇴적 산화되어 나타난 결과였다. 즉 퇴적된 용존 유기 탄소가 감소하면서 용존 산소와 질산성 질소는 감소시키지만, 이러한 환경변화가 수처리 시 문제가 될 수 있는 용존 망간의 농도를 증가시키게 되며, 따라서 향후 이 지역에 대한 추가적인 분석과 함께 집수정으로 통해 유출되는 용존 망간에 대한 대책이 필요한 것으로 조사되었다.

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Characteristics of Marine Environment and Primary Productivity of Phytoplankton in the Seaweed Bed of Northwestern Coast of Jeju Island During Autumn 2014 (2014년 추계 제주 북서부 해조장에서 해양환경과 식물플랑크톤의 일차생산력 특성)

  • KWON, HYEONG KYU;YANG, HAN SOEB;YOON, YANG HO;CHOI, OK IN;CHOI, IM HO;OH, SEOK JIN
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.20 no.4
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    • pp.180-191
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    • 2015
  • Marine environmental characteristics and primary productivity of phytoplankton were investigated in seaweed bed of northwestern coast of Jeju Island during Autumn, 2014. The trophic state based on dissolved inorganic nitrogen and phosphorus was mesotrophic. The Redfield ratio was less than 16, indicating that nitrogen was the limiting factor for the growth of phytoplankton. Dissolved organic nitrogen and phosphorus accounts for 63 and 46% of the dissolved total nitrogen and phosphorus, respectively. Light utilization efficiency (${\alpha}$) and maximum photosynthetic capacity ($P_m{^B}$) were highest in the Donggwi (third-year marine forest), followed by Gonae (one-year marine forest), Biyangdo (natural seaweed bed) and Geumneung (whitening area). The primary productivity of phytoplankton in the Donggwi, Gonae and Biyangdo also was higher than that in the Geumneung. Although nitrogen is the limiting factor, enriched dissolved organic nitrogen might play an important role to maintain primary productivity. In addition, phytoplankton community through photosynthesis could produce about 14% of phytoplankton carbon in one hour. These results will be able to use the important information for material cycle and ecological valuation of seaweed bed.

The Importance of Dissolved Organic Nutrients on the Interspecific Competition between the Harmful Dinoflagellate Cochlodinium polykrikoides and the Diatom Skeletonema sp. (유해 와편모조류 Cochlodinium polykrikoides와 규조류 Skeletonema sp.의 종간경쟁에서 용존 유기 영양염의 중요성)

  • Kwon, Hyeong Kyu;Kim, Hyun Jung;Yang, Han-Soeb;Oh, Seok Jin
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.19 no.4
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    • pp.232-242
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    • 2014
  • We investigated the interspecific competition between the harmful dinoflagellate Cochlodinium polykrikoides and diatom Skeletonema sp. based on the utilization and uptake of dissolved organic nutrients. C. polykrikoides and S. costatum were able to grow using dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) as well as dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP). This result indicates that the utilization of dissolved organic nutrients may play a role in surviving strategy in the DIN or DIP-limited environments. The half-saturation constants (Ks) of urea and glycerophosphate (glycero-P) calculated from uptake kinetics experiment of C. polykrikoides was lower than those of Skeletonema sp. This result indicates that Skeletonema sp. have higher affinity for dissolved organic nutrients, such as urea and glycero-P, than C. polykrikoides. Although Skeletonema sp. have higher affinity of dissolved organic nutrients, C. polykrikoides could effectively uptake for urea and glycero-P at sub-saturating nutrient concentrations (${\alpha}$ (${\rho}_{max}/Ks$) of C. polykrikoides was higher than Skeletonema sp.. Therefore, C. polykrikoides by utilization and effectively uptake of dissolved organic nutrients under monoculture may have an advantageous position in the interspecific competition with Skeletonema sp. in the low nutrient environments.