• Title/Summary/Keyword: Nutrients loading

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Sreamflow, Nutirnets loading estimation for KEUMGANG estrury using SWAT2000 model (SWAT2000 모형을 이용한 금강하구호의 유출량 및 영양염류 부하량 산정)

  • Moon, Jong-Pil;Kim, Tai-Cheol
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2005.10a
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    • pp.496-501
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    • 2005
  • SWAT2000 model directly estimate the loading of water, and nutrients from land areas in a watershed. it allows to add nutrient loading from the point sourece like a sewage treatment plant and it also has a GIS interface which can easily see the spatial relationship between subbasins. For better assessment of nutrients loading to KEUMGANG estuary, SWAT2000 model applied to KEUMGANG estuary watershed. Model calibration and verification was firstly poerformed at Gongju site duing the period $1999{\sim}2003$. $R^2$ value was 0.96 for streamflow, 0.94 for T-N load and 0.52 for T-P load. The accuracy of the model at Gongju site suggest that the SWAT2000 can be available to estimate streamflow, Nutrients loading to the KEUMGANG estuary.

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Prediction of Nutrient Loading from Paddy Fields (II) - Model Application - (논에서의 영양물질 배출량 추정 (II) - 모형의 적용 -)

  • 김현수;정상옥;김진수;오승영
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.44 no.5
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    • pp.106-115
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    • 2002
  • The objective of this study was to evaluate the GLEAMS-PADDY model by applying it to estimate nutrients loading from paddy-field areas. Field data from Soro region of Chungbuk province during May to September 1999 were used for model application. Field data collected include the amounts of rainfall, irrigation water, drainage water, ET, and Percolation in hydrology Part. T-N and T-P concentrations in the rain water, irrigation water, ponded water, drainage water and percolated water were measured. The comparisons of observed and simulated water balance components and nutrient concentrations showed reasonably good agreements and the GLEAMS-PADDY model may be used to simulate nutrients loading from paddy fields. Futher research was suggested to include the erosion submodel in the GLEAMS-PADDY model to better simulate the nutrient behavior. In addition, the pesticide submodel also recommended to be included in order to simulate the various pesticide applied in paddy fields.

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.

Development of GLEAMS-PADDY Model for Nutrients Loading Simulation from Paddy-field Areas (논에서의 영양물질 부하량 예측모형 개발)

  • Kim, Hyun-Soo;Jung, Sang-Ok;Kim, Jin-Soo
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2001.10a
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    • pp.445-450
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    • 2001
  • The objective of this study is to develop the GLEAMS-PADDY model for nutrients loading simulation from paddy-field areas. This model is developed by modifying the GLEAMS model. The model is composed of hydrology, sediment and chemical parts. The model was evaluatd using field data. The model estimates water balance and nutrients concentrations reasonably well. The model can be applied to find BMP's in the paddy areas.

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Analysis of the Characteristics of Nutrients Loading and the Water Purification Function in the Paddy-fields (논의 영양물질 배출부하 특성과 수질정화 기능 분석)

  • Kim Hyoon Soo;Kim Jin Soo;Kim Young Il;Cheong Byeong Ho
    • KCID journal
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    • v.11 no.1
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    • pp.36-44
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    • 2004
  • The objective of this study is to analyze the characteristics of the nutrients loading and the water purification function in the paddy-fields. This study was carried out based on the research data in the three case studies. 1. Irrigation requirement is m

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Runoff Loading of Nutrients from a Paddy Field during Non-Cropping Season (비영농기간 단일필지 논으로부터 영양물질의 유출량)

  • 조재영;한강완;최진규;구자웅;손재권
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 1999.10c
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    • pp.759-764
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    • 1999
  • In intensive agriculture, exceeded chemical fertilizer application would increase the concentration of nitrate nitrogen in groundwater. Consequently, it could bring the eutrophication in lakes and streams. The present study examined runoff loading of nitrogen and phosphorus from the paddy field during non-cropping season. The runoff loading of total-N, ammonia-N, nitrate-N and total-P were 12.96kg/ha, 5.42kg/ha, 1.52kg/ha and 1.41kg/ha. When the runoff loading of nutrients was compared by runoff water and sediments. About 70-80% of total-N by runoff water and the rest 20-30% by runoff sediments were flowed into streams. But 60-70% of total-P by runoff sediments and the rest 30-40% by runoff water were flowed into streams. The phosphorus compounds, which were flowed into streams by runoff sediments and then sedimented, keep exchanging with water at water body in undelivered condition. And it moves gradually into water layer. This process can cause eutrophication continually and repeatedly in water environment. So, a sound program is needed to reduce soil erosion from farmlands.

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Runoff Loading on Nutrients from a Paddy Field during Non-Cropping Season (비영농기간 단일필지 논으로부터 영양물질의 유출부하량)

  • 조재영
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.42 no.2
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    • pp.63-70
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    • 2000
  • The present study was carried out for 7-months (from October 1.1997 to April 30. 1998) at a rice cultivation area blocked from livestock farming, farmstead and industrial complex to investigate the runoff loading of nitrogen and phosphorus in a plot(5,000$m^2$) paddy field areas. The runoff loading of total-N, amminia-N nitrate-N and total-P were 12.96kg/ha, 5.42kg/ha, 1.52kg/ha and 1.41kg/ha , respectively. When the runoff loading of nutrients was compared by dissolved and adsorbed forms, about 66% of total-N by dissolved form and the rest 34% by adsorbed form were flowed into streams. But 56% of total-P by adsorbed form and the rest 44% by dissolved form were flowed into streams. The phosphrous compounds , which were flowed into streams by runoff sediments and then sedimented, keep exchanging with water at water body in undelivered condition. And it moves gradually into water layer. This process can cause eutrophication continually and repeatedly in water environment . So, a sound program is needed to reduce soil erosion from farmlands.

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Investigation of Hanwoo manure management and estimation of nutrient loading coefficients on land application

  • Won, Seunggun;You, Byung-Gu;Ra, Changsix
    • Journal of Animal Science and Technology
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    • v.57 no.5
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    • pp.20.1-20.8
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    • 2015
  • Background: In order to prepare for the regulation about the limit of manure production, the status of manure management and the amount of nutrients in the compost discharged from Hanwoo breeding farm shall be known. This study aimed to find the practical amount of nutrients (volatile solids, VS; total nitrogen, T-N; total phosphorus, T-P) in manure, and compost samples collected from 40 Hanwoo breeding farms and the loss of the nutrients was calculated during the composting period, which supports to develop nutrient loading coefficients (NLCs) for each nutrient. Results: Although the addition of bedding materials for composting caused the increase of the VS amount before composting, the comparison of VS, N, and P amounts in between manure and compost showed the lower VS by 4 % as well as T-N and T-P amounts by 69 and 40 %, respectively, of which values were corresponded with the NLCs of 0.96, 0.31, and 0.60 for VS, N, and P, respectively, based on the questionnaire, and sample analyses. Considering with the environmental impacts including land application from Hanwoo manure, P loss should be zero before and after composting. In this regard, nitrogen loss of 50 % occurs and VS was increased by 30 %. In addition, feasible cases for the calculations based on the notification from Ministry of Environment were compared with this study. Conclusions: The development of NLCs from Hanwoo manure in this study implies that the loss of nutrients in manure occurs during the composting or storing period. The mass balances of N and P from livestock manure to land application may be overestimated over the practical values. It is necessary to build up the database about each livestock category other than Hanwoo.

Water Balance and Nutrient Losses of Paddy Fields Irrigated from a Pumping Station (양수장지구 구획논 물수지와 영양염류 유출부하)

  • Choi, Jin-Kyu;Koo, Ja-Woong;Son, Jae-Gwon;Cho, Jae-Young;Yoon, Kwang-Sik;Han, Kuk-Heon
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2001.10a
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    • pp.394-398
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    • 2001
  • The study was carried out to investigate the water balance and losses of nutrients from paddy fields during cropping period. The size of paddy fields was 95 ha and the fields were irrigated from a pumping station. The runoff loading was the highest in June because of the high concentrations of nutrients due to applied fertilizer. When the runoff losses of nutrients were compared to applied chemical fertilizer, it was found that 39.1 % to 42.5 % of nitrogen lost via runoff while runoff losses of phosphorus account for 6.3 % to 8.0 % of the total applied amount during cropping period. When the ratio was calculated between nutrients losses by infiltration and the applied of chemical fertilizer, two year results showed 9.1 % to 10.7 % for nitrogen and 0.2 % for phosphorus, respectively.

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Nutrient production from Korean poultry and loading estimations for cropland

  • Won, Seunggun;Ahmed, Naveed;You, Byung-Gu;Shim, Soomin;Kim, Seung-Su;Ra, Changsix
    • Journal of Animal Science and Technology
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    • v.60 no.2
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    • pp.3.1-3.9
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    • 2018
  • Background: Poultry breeding has increased by 306% in Korea, inevitably increasing the production of manure which may contribute to environmental pollution. The nutrients (NP) in the manure are essential for crop cultivation and soil fertility when applied as compost. Excess nutrients from manure can be accumulated on the land and can lead to eutrophication. Therefore, a nutrient load on the finite land should be calculated. Methods: This study calculates the nutrient production from Korean poultry by investigating 11 broiler and 16 laying hen farms. The broiler manure was composted using deep litter composting while for layer deep litter composting, drying, and simple static pile were in practice. The effect of weight reduction and storing period during composting was checked. Three weight reduction cases of compost were constructed to calculate nutrient loading coefficients (NLCs) using data from; i) farm investigation, ii) theoretical P changes (${\Delta}P=0$), and iii) dry basis. Results: During farm investigation of broiler and layer with deep litter composting, there was a 68 and 21% N loss whereas 77 and 33% P loss was found, respectively. In case of layer composting, a loss of 10-56% N and a 52% P loss was observed. Drying manure increased the P concentrations therefore NLCs calculated using dry basis that showed quite higher reductions (67% N; 53% P). Nutrient loss from farm investigation was much higher than reported by Korean Ministry of Environment (ME). Conclusions: Nutrients in manure are decreased when undergo storing or composting process due to microbial action, drying, and leaching. The nutrient load applied to soil is less than the fresh manure, hence the livestock manure management and conservation of environment would be facilitated.