• Title/Summary/Keyword: Acid Soil

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아세트산의 농도에 따른 Ferrous Soil의 동전기 정화 거동

  • 이정철;김병일;조대호;김수삼
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2003.09a
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    • pp.306-309
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    • 2003
  • The natural soil containing organic matter and ferrous is used in the Electrokinetic-Flushing Remediation(EFR) tests. A series of tests are carried out through controlling the concentration of acetic acid in the EFR cell. The test results showed that the electrical potential in X/L=0.9 is increased with the increasing of the concentration, and pH in the sample is the similar at all of the region because of the buffer capacity of natural soil. Finally, the efficiency of EFR is enhanced at acetic acid of 1mM. But it may not be not strongly affected by the concentration of acetic acid.

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Biodegradability of Polylactic Acid Fabrics by Enzyme Hydrolysis and Soil Degradation

  • Lee, So Hee
    • Textile Coloration and Finishing
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    • v.29 no.4
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    • pp.181-194
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    • 2017
  • The biodegradability of polylactic acid(PLA) fabrics was evaluated by two methods: enzyme and soil degradation. Three different enzymes were selected to evaluate. Degradation times were measured at optimal enzyme treatment conditions. Biodegradation by enzymatic hydrolysis was compared with soil degradation. As a result, biodegradation created cracks on the fiber surface, which led to fiber thickening and shortening. In addition, new peak was observed at $18.5^{\circ}$ by degradation. Moreover, cracks indicating biofragmentation were confirmed by enzyme and soil degradation. By enzyme and soil degradation, the weight loss of PLA fabrics was occurred, there through, the tensile strength decreased about 25% by enzyme hydrolysis when 21 days after, and 21.67% by soil degradation when 60 days after. Furthermore, the biodegradability of PLA fabrics by enzymatic and soil degradation was investigated and enzymatic degradation was found to be superior to soil degradation of PLA fabrics. Among the three enzymes evaluated for enzymatic degradation, alcalase was the most efficient enzymes. This study established the mechanism of biodegradation of PLA nonwovens, which might prove useful in the textile industry.

Studies on the humus soil reclaimed by farming for cultivation (화전토양(火田土壤)의 부식(腐植)에 관(關)한 연구(硏究))

  • Kwag, Pan-Ju
    • Applied Biological Chemistry
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    • v.9
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    • pp.153-159
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    • 1968
  • In this paper the auther investigated the chemical properties, process of humification and type of humic acid in soils which were reclaimed by farming for cultivation in Kangwondo. The results obtained in this studies were summarized as follows: 1. General chemical components of these soil were similar to the ordinary soil but C.E.C. and humus contents were found much more 2. Humic acid and fulvic acid which were extracted with NaOH from soil were greater than those of Na-pyrophosphate(Na-p.) and NaF. Hmus contents and PQ% were increased much more in the upper layer than in the lower layer. 3. Degree of humification of humic acid extracted with NaOH. was very similar to those extracted with Na-pyrophosphate. Humification degree of humic acid extracted with NaF was lower than humic acid which were extracted with NaOH and Na-pyrophosphate. But humification degree of humic acid extracted with NaOH was similar to that with Na-pyrophosphate. Humic acid in B soil and the upper layer was higher than A, C soil and the lower layer of soil, in humification degree. 4. Humic acids extracted with NaOH and Na-pyrophosphate from soil were fractionated by Mg into two parts ${\alpha}$ type and ${\beta}$ type humic acid. Humic acids of ${\alpha}$ and ${\beta}$ type extracted with NaOH were higher than these of Na-pyrophosphate in humification degree. In this soil the humification degree of humic acid was not changed during the period of cultivation. 5. ${\alpha}$, ${\beta}$ type humic acid extracted with NaOH were very similar to the humic acid extracted with Na-pyrophosphate in shapes of absorption curves.

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CHEMICAL DECONTAMINATION OF SOIL CONTAMINATED WITH Cs-137

  • H. J. Won;Kim, G. N.;C. H. Jung;Park, W. K.;Kim, M. G.;W. Z. Oh;Park, J. H.
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2004.02a
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    • pp.83-95
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    • 2004
  • The removal efficiency of several washing agents on the $Cs^+$ ion was investigated. Leaching of $Cs^+$ ion from the soil surface by washing agents is affected by the exchange capability of the washing solution. Reuse tests of the effective soil washing agents such as $BaCl_2$, NaOH, citric acid+ $HNO_3$ and oxalic acid were performed. NaOH, citric acid + $HNO_3$ and oxalic acid solutions can be reused after passing through the ion exchange column. Among the tested solutions, both of citric acid+ $HNO_3$ and oxalic acid were effective for the decontamination of TRIGA research reactor soil. The radioactivity of soils can be reduced to a release level by the successive application.

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Behaviors of Chloronicotinyl Insecticide Acetamiprid in Soil (Chloronicotinyl계 살충제 Acetamiprid의 토양 환경중 동태)

  • Hong, Min-Kee;Park, Jong-Woo;Kim, Jang-Eok
    • Korean Journal of Environmental Agriculture
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    • v.20 no.3
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    • pp.162-168
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    • 2001
  • This study was conducted to evaluate the degradation, adsorption and desorption and leaching of acetamiprid in soils. The half-life of acetamiprid in field condition was $1.7{\sim}3.3$ days in Bokhyun soil and, in case of laboratory condition, 15.5 days. Adsorption of acetamiprid was equilibrated in 12 hours incubation. In adsorption experiment using modified soils, such as oxidized soil, oxidized soil added humic acid, fulvic acid, kaolinite or montmorillinite, adsorption rate of acetamiprid was the highest in the oxidized soil added fulvic acid. The desorption rate was the lowest in the oxidized soil added fulvic acid. The adsorption and desorption results should be suggested that acetamiprid could be strongly adsorbed with soil humic materials, especially fulvic acid. When the mobility of acetamiprid in soil was calculated according to GUS (Groundwater Ubiquity Score) equation, it was prove to non-leacher, and it was confirmed in the leaching experiment with soil column. Most of acetamiprid was remained in the upper 30 cm of the soil column after eluting with water and it was not even detected in leachate.

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A Study on the Development of Soil Neutrailizing-agent using Waste Materials (Waste-lime, Oyster, Bottom-ash) (폐자원(폐석회, 굴패각, 바닥재)을 이용한 토양 중화제 개발 연구)

  • Oh, SeungJin;Cho, Mihyeon;Park, Chan-O;Jung, Moon-Ho;Lee, Jai-Young
    • Journal of Soil and Groundwater Environment
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    • v.17 no.6
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    • pp.92-101
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    • 2012
  • Korea shows the soil pH is 5.8 ~ 6.2 by many factors including the geological structure and climate condition. There is known as the cause for soil acidification by weathering of the mineral, excessive use of the chemical fertilizer, and extensively diffused acid rain. The purpose of research is environmentally-friendly material neutralization technology development utilizing the waste resources against by acid soil. The experiment analyze the physico-chemical property of the acid soil and waste resource materials (waste lime, oyster shell, bottom ash). The Batch-Test was performed under 3 stage. As a result, the acid soil showed up acid soil about 3.19. And waste lime, oyster, bottom ash showed the alkalinity with 9.62, 10.08, 9.17. In case of 1 batch-test experimental result, waste lime and oyster shell, the alkalinity was shown over 7.5 and the good efficiency was showed, on the other hands, the bottom ash showed the pH 4 the neutralization efficiency which is low. waste resource materials to be applied to 2 steps was chosen as the waste lime except the bottom ash and oyster. In 2 step batch-test experiment, it was exposed to be the most appropriate in case of doing the combination ratio of the waste lime and oyster shell with 9 : 1. It was exposed to be efficient most in the effeciency and aspect of economical efficiency combination ratio of the soil and materials was 9.6 : 0.6 with 3 step batch-test experimental result.

A Study on Acid soil amendment by Addition of Sewage Treatment Sludge mixed Oyster Shell (하수슬러지와 굴껍질의 혼합첨가에 의한 산성토양 교정효과)

  • Moon, Jong-Ik;Choi, Sung-Moon;Sung, Nak-Chang;Huh, Mock;Kim, Boo-Gil;Kim, Chul
    • Journal of the Korea Organic Resources Recycling Association
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    • v.9 no.2
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    • pp.66-70
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    • 2001
  • In this study farm soil was tested under artificial acid rain(pH = 5.34), which is average pH of Pusan metropolitan area. and to find out the soil's acid neuralization capacity, soil acidity, CEC(cation exchange capacity)and akaline meatals, such as K, Ca and Na were tested. Because oyster shells(OS) had portion of alkaline metals, OS could play a role in acid soil amendment. And soil addition of sewage treatment sludge(STS) could be a alternative for disposal method. The purpose of this study is to evlauate acid soil amendment using STS and OS. In case of soil and STS, mixing ratio was10:0, 9:1, 8:2, 7:3. And STS mixed OS was also added in acid soil as same ratio as STS. Throught the experiment, soil acidity was stationary state with slight decrease, and CEC was also stationary state but with slight increase. Allkaline metals showed differences in concentration, but all of them were tend to decrease. In conclusion, STS mixed OS could play a part in amendment of acid soil.

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LAND FARMING OF WATER PLANT ALUM SLUDGE ON ACID MINERAL SOIL AFFECTED BY ACID WATER

  • Lee, Seung-Sin;Kim, Jae-Gon;Moon, Hi-Soo;Kang, Il-Mo
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2001.04a
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    • pp.182-186
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    • 2001
  • An acid forest surface soil as a land farming medium was treated with a water plant alum sludge at 0 to 18%. Indian mustard was grown in the treated soil in a greenhouse for 5 weeks and watered with pH 4 tap water adjusted with a mixed acid (1HNO$_3$: 2H$_2$SO$_4$) during plant growth. Changes in soil property, leachate chemistry, plant growth, and plant uptake of elements by the sludge treatment were determined. The alum sludge treatment increased buffer capacity to acidity, hydraulic conductivity, water holding capacity, and phosphate adsorption of the soil and decreased bulk density and mobility of small particles. The sludge treatment reduced leaching of Al, Mg, K, Na, and root elongation. Plant did uptake less amount of the cations and P but more Ca with the sludge treatment.

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Responses of Low-Quality Soil Microbial Community Structure and Activities to Application of a Mixed Material of Humic Acid, Biochar, and Super Absorbent Polymer

  • Li, Fangze;Men, Shuhui;Zhang, Shiwei;Huang, Juan;Puyang, Xuehua;Wu, Zhenqing;Huang, Zhanbin
    • Journal of Microbiology and Biotechnology
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    • v.30 no.9
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    • pp.1310-1320
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    • 2020
  • Low-quality soil for land reuse is a crucial problem in vegetation quality and especially to waste disposal sites in mining areas. It is necessary to find suitable materials to improve the soil quality and especially to increase soil microbial diversity and activity. In this study, pot experiments were conducted to investigate the effect of a mixed material of humic acid, super absorbent polymer and biochar on low-quality soil indexes and the microbial community response. The indexes included soil physicochemical properties and the corresponding plant growth. The results showed that the mixed material could improve chemical properties and physical structure of soil by increasing the bulk density, porosity, macro aggregate, and promote the mineralization of nutrient elements in soil. The best performance was achieved by adding 3 g·kg-1 super absorbent polymer, 3 g·kg-1 humic acid, and 10 g·kg-1 biochar to soil with plant total nitrogen, dry weight and height increased by 85.18%, 266.41% and 74.06%, respectively. Physicochemical properties caused changes in soil microbial diversity. Acidobacteria, Bacteroidetes, Chloroflexi, Cyanobacteria, Firmicutes, Nitrospirae, Planctomycetes, and Proteobacteria were significantly positively correlated with most of the physical, chemical and plant indicators. Actinobacteria and Armatimonadetes were significantly negatively correlated with most measurement factors. Therefore, this study can contribute to improving the understanding of low-quality soil and how it affects soil microbial functions and sustainability.

Studies on the Detergency Characteristics of Free Fatty Acid in Oily Soil (Part II. Detergency of Particulate Soil) (오염중의 유리지방산이 세척성에 미치는 영향 제2보 고형오염의 세척성)

  • Kim Eun Ok;Kim Sung Reon
    • Journal of the Korean Society of Clothing and Textiles
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    • v.4 no.1_2
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    • pp.43-48
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    • 1980
  • The effect of free fatty acid in fatty soil on the detergency of particulate soil was investigated. Cotton lawn fabric was soiled with the mixture of polmitic acid, hydrogenated fat, paraffin oil and iron oxide black altering the contents of palmitic acid and was laundered with different sur-fastants under various temperature and alkalinity. The rate of soil removal was estimated by means of the spectoometic analysis of iron on the fabric before and after washing. The results of dergency were compared those obtained by reflactance and K/S value from Kubelka-Munk equation which were derived from reflactance measurements.

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