• Title/Summary/Keyword: nutrient ion

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Effects of Thermal Wastewater Effluent and Hydrogen Ion Potential (pH) on Water Quality and Periphyton Biomass in a Small Stream (Buso) of Pocheon Area, Korea (포천지역 계류 (부소천)의 수질과 부착조류 생물량에 온배수와 수소이온농도 (pH) 영향)

  • Jeon, Gyeonghye;Eum, Hyun Soo;Jung, Jinho;Hwang, Soon-Jin;Shin, Jae-Ki
    • Korean Journal of Ecology and Environment
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    • v.50 no.1
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    • pp.96-115
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    • 2017
  • Understanding effects of thermal pollution and acidification has long been a concern of aquatic ecologists, but it remains largely unknown in Korea. This study was performed to elucidate the effects of thermal wastewater effluent (TWE) and acid rain on water quality and attached algae in a small mountain stream, the Buso Stream, a tributary located in the Hantan River basin. A total of five study sites were selected in the upstream area including the inflowing point of hot-spring wastewater (HSW), one upstream site (BSU), and three sites below thermal effluent merged into the stream (1 m, 10 m and 300 m for BSD1, BSD2, and BSD3, respectively). Field surveys and laboratory analyses were carried out every month from December 2015 to September 2016. Water temperature ranged $1.7{\sim}28.8^{\circ}C$ with a mean of $15.0^{\circ}C$ among all sites. Due to the effect of thermal effluent, water temperature at HSW site was sustained at high level during the study period from $17.5^{\circ}C$ (January) to $28.8^{\circ}C$ (September) with a mean of $24.2{\pm}3.7^{\circ}C$, which was significantly higher than other sites. Thermal wastewater effluent also brought in high concentration of nutrients(N, P). The effect of TWE was particularly apparent during dry season and low temperature period (December~March). Temperature effect of TWE did not last toward downstream, while nutrient effect seemed to maintain in longer distance. pH ranged 5.1~8.4 with a mean of 6.9 among all sites during the study period. The pH decrease was attributed to seasonal acid rain and snow fall, and their effects was identified by acidophilic diatoms dominated mainly by Eunotia pectinalis and Tabellaria flocculosa during March and August. These findings indicated that water quality and periphyton assemblages in the upstream region of Buso Stream were affected by thermal pollution, eutrophication, and acidification, and their confounding effects were seasonally variable.

Effect of soil-ameliorator mixtures on nutrient leaching in sandy paddy soil (사질답토양(砂質畓土壤)에 수종(數種) 개량제(改良劑) 시용(施用)이 양분용탈(養分溶脫)에 미치는 영향(影響))

  • Ahn, Sang-Bae;Park, Jun-Kyu;Yeon, Beong-Yeal;Yuk, Chang-Soo
    • Korean Journal of Soil Science and Fertilizer
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    • v.20 no.2
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    • pp.131-138
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    • 1987
  • Experimental informations on the possible alternative resources of soil addition in sandy paddy soils were obtained by applying fertilizer N, P, and K to the top of 26 cm long columns containing the soil-ameliorator mixture and by determining the concentration and leaching loss of nutrients in percolated water and permeability. 1. Addition of red earth and compost to soils decreased pronouncedly the permeability. Relative magnitude of permeability was compost+slag+red earth > compost+red earth > compost > red earth > compost+slag > slag > non-added soil. 2. Concentration and leaching loss of $NH_4-N$ and $SiO_2$ were high by addition of compost-slag or red earth mixture to soils. The present of these nutrients in soils after experiment was, also, higher than that in non-added soil and in red earth to soils. 3. Those of K, Ca, and Mg were similar to $NH_4-N$ and $SiO_2$. Especially, leaching loss and present of K in soils by addition of compost to soils were higher dramatically than those of non-added soil and of red earth to soils. 4. Those of $Fe^{{+}{+}}$ in non-added soil were much higher than those by addition of compost and slag to soils. These values were the highest in 12 days after submergence, while these of $Mn^{{+}{+}}$ the lowest. 5. Concentration of $NH_4-N$ was high by addition of compost to soils, while the present of it in soils after experiment was tended to be contrary.

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The Demand Analysis of Water Purification of Groundwater for the Horticultural Water Supply (시설원예 용수 공급을 위한 지하수 정수 요구도 분석)

  • Lee, Taeseok;Son, Jinkwan;Jin, Yujeong;Lee, Donggwan;Jang, Jaekyung;Paek, Yee;Lim, Ryugap
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.12
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    • pp.510-523
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    • 2020
  • This study analyzed groundwater quality in hydroponic cultivation facilities. Through this study, the possibility of groundwater use was evaluated according to the quality of the groundwater for hydroponic cultivation facilities. Good groundwater quality, on average, is pH 6.61, EC 0.27 dS/m, NO3-N 7.64 mg/L, NH4+-N 0.80 mg/L, PO4-P 0.09 mg/L, K+ 6.26 mg/L, Ca2+ 18.57 mg/L, Mg2+ 4.38 mg/L, Na+ 20.85 mg/L, etc. All of these satisfy the water quality standard for raw water in nutrient cultivation. But in the case of farmers experiencing problems with groundwater quality, most of the items exceeded the water quality standard. As a result of the analysis, it was judged that purifying groundwater of unsuitable quality for crop cultivation, and using it as raw water, was effective in terms of water quality and soil purification. If an agricultural water purification system is constructed based on the results of this study, it is judged that the design will be easy because the items to be treated can be estimated. If a purification system is established, it can use groundwater directly in the facility and for horticulture. These study results will be available for use in sustainable agriculture and environments.