• Title/Summary/Keyword: Nutrients

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Estimation of Nutrients Transport in Kamak Bay using the Eco-hydrodynamic Model (생태계모델을 이용한 가막만의 영양염 거동 특성 평가)

  • 김동명
    • Journal of Environmental Science International
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    • v.12 no.7
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    • pp.745-751
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    • 2003
  • The three-dimensional eco-hydrodynamic model was applied to estimate the physical process in terms of nutrients and net uptake(or regeneration) rate of nutrients in Kamak Bay for scenario analysis to find proper management plan. The estimation results of the physical process in terms of nutrients shelved that transportation of nutrients is dominant in surface level while accumulation of nutrients is dominant in bottom level. In the case of dissolved inorganic nitrogen, the results showed that the net uptake rate was 0∼60 mg/㎡/day in surface level(0∼3m), and the net regeneration rate was 0.0∼10.0 mg/㎡/day in middle level(3∼6m) and above 10mg/㎡/day in bottom level(6m∼below). In the case of dissolved inorganic phosphorus, the net uptake rate was 0.0∼3.0 mg/㎡/day in surface level, and the net regeneration rate was 0.5∼1.5 mg/㎡/day in middle level and 1.0∼3.0 mg/㎡/day in bottom level. These results indicates that net uptake and transport of nutrients are occurred predominantly at the surface level and the net generation and accumulation are dominant at bottom level. Therefore, it is important to consider the re-supplement of nutrients due to regeneration of bottom water.

Nature of Japanese Diet : Variations in Intake of Nutrients and Foods

  • Tokudome, Yuko;Imaeda, Nahomi;Ikeda, Masato;Hagaya, Teruo;Tokudom, Shinkan
    • Journal of Community Nutrition
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    • v.5 no.2
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    • pp.72-82
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    • 2003
  • We here outlined our study on the variations in intake of nutrients based on four season 7 consecutive day weighed diet records (WDRs) from 80 Japanese female dietitians in 1996 - 1997. Furthermore, we reviewed Japanese, Korean and international articles investigating variability in consumption of foods as well as nutrients. The relative contributions of variation for all nutrients by person were greater than those by day, week and season. Within individual variances were greater than that between individual variances, being generally observed in Korea and in the world. The ratios of within- vs. between-individual variations ranged from 1.3-26.9 in our study, the ratios being greatest in Korean, followed by Japanese and western people. Based on within individual coefficients of variation, minimal days necessary for estimating nutrient consumption per person within 10% (20%) of the true mean with 95% confidence intervals were estimated. They ranged from 10-35 (3-9) days for energy and major nutrients and 15-640(4-160) days for micro-nutrients. Two Japanese studies reported that the ratios for foods were as a whole greater than those for nutrients, except for cereals, rice and milk. (J community Nutrition 5(2) : 72-82,2003).

A method of environmental management using an ecological numerical model in Jindong Bay (진동만에서 생태계모델을 이용한 환경관리기법)

  • 김동선
    • Journal of Environmental Science International
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    • v.12 no.3
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    • pp.345-358
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    • 2003
  • Jindong bay at the northwestern part of Jinhae bay suffers from the occurrence of red tides in summer every year. In order to study the management methods of coastal environments, an ecological numerical model has been developed. The model experiments was forecasted that the load of nutrients from the land and field concentration will be cut down per 10% each. When we cut down 57.2% nitrogen load in the inner bay and 38.4% phosphorous load in the outer bay of bottom layer of the nutrients load from land and field concentration, the seawater quality standard levels up first grade. When we cut down 86.5% nutrients in the inner bay and 93.0% nutrients in the outer bay, the concentration of chlorophyll a decreases below 3.2 $\mu\textrm{g}$/(equation omitted)(an individual concentration of phytoplankton : 10,000cel1/ml), i.e. the red tides do not occur.

A study on the measurement of nutrients release from sediment (영양염 용출 측정에 관한 고찰)

  • 김도희
    • Journal of Environmental Science International
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    • v.11 no.12
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    • pp.1333-1337
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    • 2002
  • A significant fraction of nutrients, such as nitrogen and phosphorus released from sediment are utilized by primary production in the shallow water of coast and lake. The purpose of this study is to introduce the mechanism of nutrients release from sediment and to introduce the methods of the measurement of nutrient released from sediment. One approach is to calculate nutrients released from sediment by a concentration gradient between sediment pore waters and overlying water based on the Fick's law. The other approaches of measurement are the undisturbed sediment core experiments and measurement of nutrient released from sediment by the in situ chamber equipment.

The Comparison of Nutrients intake and Dietary Environment between Rural and Asylum Elderly in partial area of Kyunggi (경기일부지역 농촌노인과 양로원 노인의 영양섭취상태와 식생활환경요인의 비교)

  • 박양자;이승교
    • Korean Journal of Rural Living Science
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    • v.7 no.1
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    • pp.39-50
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    • 1996
  • This study was carried out to investigate nutrients intake and dietary environments of rural and asylum elderly in partial Kyunggi area. Results were as followes: (1) Educational level of 2 groups of rural and asylum elderly was only literacy, And rural elderly worked more than the aged of asylum. (2) The nutrients intake of rural elderly was very small quantity: Energy intake was 62% of RDA, that of protein 59%, calcium 56%, and iron 72% only. This nutrients intake state was lower than that of asylum elderly. (3) Health score CMI was selected 31 cases of items for aged. Ryal elderly received 11.7/31, but the scores of asylum elderly were 7.1 only. It means that asylum elderly felt more healthy than rural. (4) The correlation Serum TG was significant with protein fat and calcium, but serum calcium was not significant with intake of calcium. The nutrients intake was correlated with CMI score and dietary habit score.

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Comparison of the Blood Lipid , Insulin and Nutrients Intake by Fat Distribution of Obese Male in Korea (비만 남자 대학생의 비만 유형에 따른 혈중 지질, 인슐린 농도 및 영양소섭취량 비교 연구)

  • 김순경
    • Journal of Nutrition and Health
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    • v.31 no.1
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    • pp.72-79
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    • 1998
  • This study was intended to figure out the difference of the blood lipids, insulin and nutrients intake by fat distribution among the obese young male in Korean. Twenty-eight male college students participated in this study, whose to find out body fat distributions were classified on the basis of Waist /hip ratio (WHR) into three groups-upper body type (UBTM), intermediate body type(IBTM) and lower body type (LBTM). To conduct this study, anthropometric measurements , blood pressure, serum lipids and insulin levels, and daily nutrients intake were analized . The results are as follows : The three body type groups showed significant differences each other in waist circumference(p<0.05), WTR(p<0.001) and body fat percentage (p<0.05). Also they showed significant difference each other in the daily construction in the daily energy intake. But they did not show significant differences in the blood pressure, serum lipids and insulin levels. From the above results, we could concluded that the body fat distribution in obese the young men could affect nutrients intake pattern.

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The Study on Eating behavior and Nutrients intake about Seoul, Cheon Nam region. (지역에 따른 섭식태도 및 영양섭취 실태에 관한 조사연구 -서울.전남 일부지역을 중심으로-)

  • 손경희
    • Journal of the Korean Home Economics Association
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    • v.26 no.1
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    • pp.63-71
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    • 1988
  • This study was attempted to investigate the difference f eating behavior and nutrients intake according to Region. The summarized results are as follows; the economic values were most important scores and highest ranks for most of subjects, followed by health and social. subjects in Cheon Nam consider health values more important than those in Seoul, who consider social values more important than former. Food habits of subjects in both regions belonged to "Fair" group, the score of food habit it in Cheon Nam was higher than those in Seoul. Though Subjects in both regions showed similar in level of nutrients intake, Cheon nam are a little higher than Seoul(average 1~2%). This survey showed the more they concerned with health value, the better food habits and nutrients intake they had. The residents in Cheon Nam regarded health more importantly and had better food habits, and higher standard of nutrients intake than those in Seoul. in Seoul.

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Nutrients removal enhancement using a modified rotating activated bacillus contactor (RABC) process (수정 RABC 공정을 이용한 영양염류 제거능 제고에 관한 연구)

  • Kim, Sunhee;Kim, Donghwan;Jang, Giung;Kim, Eung-Ho
    • Journal of Korean Society of Water and Wastewater
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    • v.30 no.1
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    • pp.99-104
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    • 2016
  • This study was performed to develop a new process technology for advanced wastewater treatment using a modified Rotating Activated Bacillus Contactor (RABC) process that adopts anoxic-oxic suspended biomass tanks to enhance nutrients removal. A modified lab-scale RABC process was applied to examine its applicability and to obtain the design factors for the optimum operation of the system. The modified RABC process showed a little more stable and high nutrients removal efficiency than the prototype RABC process: about 70% of nitrogen and 55% of phosphorous removal when the low organic loading (influent COD 200mg/L). However, the processing efficiency of nutrients removal rates was enhanced to great extent when high organic loading: nitrogen 90% and phosphorous 85% (influent COD 500mg/L). High organic loading stimulated extremely good biomass attachment on the reticular carrier RABC stage and the excellent nutrients removal, nevertheless with almost no offensive odor.

The Impact on Water Quality from Blue-Green Algae Microcystis Natural Phytoplankton by Algal Assay (생물검정에 의한 남조류 Microcystis가 수질에 미치는 영향)

  • Shin, Jae-Ki;Cho, Kyung-Ja
    • Journal of Environmental Science International
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    • v.9 no.3
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    • pp.267-273
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    • 2000
  • In order to understand the impact for decomposition of blue-green algae Microcystis on water quality, the algae were cultivated with collection of natural population during approximately one month, when water-bloom of Microcystis dominated at August 31, 1999 in the lower part of the Okchon Stream. The enrichment of inorganic NㆍP nutrients didn't in algal assay and the effect of Microcystis on water duality was assessed from the variation of nutrients by algal senescence. Microcystis population seemed to play a temporary role of sink for nutrients in the water body. Initial algal density of Microcystis was 2.3×10/sup 6/ cells/㎖. When Microcystis population died out under light condition, algal NㆍP nutrients between 9∼12 days affected to increase of biomass after reuse by other algal growth as soon as release to the ambient water. However, cellular nutrients under dark condition were almost moved into the water during algal cultivation. NH₄, NO₃ and SRP concentration were highly increased with 160, 17 and 79 folds, respectively relative to the early. As a result, the senescence of Microcystis population seemed to be an important biological factor in which cause more eutrophy and increase of explosive algal development by a lot of nutrients transfer to water body. There are significantly observed an effort of reduce for production of inner organic matters such a phytoplankton as well as load pollutants from watershed in side of the water quality management of reservoir.

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Adsorption and Leaching Characteristics of the Artificial Soils Produced from Sludge (슬러지를 이용하여 생산한 인공토양의 흡착 및 용출 특성)

  • 윤춘경;김선주;임융호;정일민
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.40 no.4
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    • pp.77-84
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    • 1998
  • Adsorption and leaching characteristics of the artificial soils produced from water and wastewater treatment sludges were examined. The batch adsorption test and TCLP leaching test were used, and constituents of interest were heavy metals and nutrients. As, Cr, Cu, Pb, and Cd were analyzed for metals, and nitrogen and phosphorus were analyzed for nutrients. All the artificial soils showed strong adsorption and low leaching for the heavy metals, which implies that the artificial soils may not be hazardous to the environment due to heavy metals and even they can be utilized effectively to remove metals in solution like mine and industrial wastewaters. This is quite promising result because in most case heavy metals are the most concern in the application of sludge product to the farmland. For the nutrients, generally, artificial soils showed high adsorption and low leaching except artificial soil from wastewater sludge produced by low temperature firing. The artificial soils produced from water treatment sludge were active in adsorbing nutrients and showed low leaching that they can be practically used to remove nutrients in advanced treatment process of the wastewater. The artificial soils produced from wastewater treatment sludge were less active in adsorbing nutrients and showed high teaching. However, they could be used usefully if applied properly to the plant growing because of their fertilizing effect. Based on the test results, overall, the artificial soils were thought to be not hazardous to the environment and they could be more useful if applied properly.

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