• Title/Summary/Keyword: Chemical oxidation

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Comparison of Land Farming and Chemical Oxidation based on Environmental Footprint Analysis (환경적 footprint 분석을 통한 토양경작법과 화학적산화법의 비교)

  • Kim, Yun-Soo;Lim, Hyung-Suk;Park, Jae-Woo
    • Journal of Soil and Groundwater Environment
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    • v.20 no.3
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    • pp.7-14
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    • 2015
  • In this study, land farming and chemical oxidation of a diesel-contaminated site is compared to evaluate the environmental impact during soil remediation using the Spreadsheet for Environmental Footprint Analysis by U.S. EPA. Each remediation process is divided into four phases, consisting of soil excavation, backfill and transportation (Phase 0), construction of remediation facility (Phase 1), remediation operation (Phase 2), and restoration of site and waste disposal (Phase 3). Environmental footprints, such as material use, energy consumption, air emission, water use and waste generation, are analyzed to find the way to minimize the environmental impact. In material use and waste generation, land farming has more environmental effect than chemical oxidation due to the concrete and backfill material used to construct land farming facility in Phase 1. Also, in energy use, land farming use about six times more energy than chemical oxidation because of cement production and fuel use of heavy machinery, such as backhoe and truck. However, carbon dioxide, commonly considered as important factor of environmental impact due to global warming effect, is emitted more in chemical oxidation because of hydrogen peroxide production. Water use of chemical oxidation is also 2.1 times higher than land farming.

Monitoring the Leachate Toxicities from a Pilot Landfill Treated with Chemical Oxidation using Hydrogen Peroxide and Aeration (과산화수소수와 통기에 의한 Chemical oxidation법을 적용한 모형 매립지로부터 생성된 침출수의 독성 monitoring)

  • Cho, Eun-Ah;Tameda, Kazuo;Hanashima, Masataka;Yoshijaki, Koudai;Uchida, Masanobu;Higuchi, Sotaro
    • Environmental Analysis Health and Toxicology
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    • v.23 no.4
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    • pp.307-314
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    • 2008
  • 폐기물 매립지의 조기 안전화를 위해 여러 가지 Chemical Oxidation법이 개발되어 왔지만, 이 방법을 폐기물 매립지에 적용하고 난 후에 생성될 수 있는 부산물들이 주변 환경에 영향을 줄 가능성이 있다. 그래서, 이 방법을 실제 매립지에 적용하기 전에, 일본 키타큐슈에 있는 소각재가 묻혀 있는 모형 매립지에 다섯 가지 조건 -A, 콤포스트 추가; B, 과산화수소수 살수; 과산화수소수+공기주입; D, 공기주입; E, control- 을 적용하여 그 효능을 테스트하였고, 이 매립지에서 이 방법들의 적용 후에 생성되는 침출수의 급성 독성을 세 가지 microbiotests를 이용하여 monitoring하였다. 테스트 기간 중, 침출수의 수질은 개선되었고, 그 급성 독성은 점차적으로 감소하였다. 과산화수소수와 공기의 조합을 적용한 후 생성된 침출수의 급성 독성이 가장 빨리 감소하여 폐기물 매립지의 조기 안정화에 도움을 주었다. 이러한 독성 시험 결과는 몇 가지 화학적 parameters와 상관성이 있었고 여기에 사용된 급성 독성 테스트법은, 매립지 안정화를 위한 Chemical Oxidation법의 적용 후, 침출수 수질을 monitoring하는데 적절하였다. 그러므로 폐기물 매립지의 조기 폐지 기준에 독성 시험의 포함을 고려해 볼 필요가 있다고 생각한다.

Mechanism of Intercalation Compounds in Graphite with Hydrogen Sulfate (I. Study of Intermediate Phase between 2 Stage and 1 Stage in Graphite Hydrogen Sulfate with Anodic Oxidation) (흑연에 황산을 Intercalation 시킬때의 Mechanism 규명 (I. 전기적 산화방법에 의한 Graphite Salts의 중간상에 관한 연구))

  • 고영신;한경석;이풍헌
    • Journal of the Korean Ceramic Society
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    • v.22 no.6
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    • pp.5-8
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    • 1985
  • Graphite has been oxidized to graphite hydrogen sulfate in concentrated $H_2SO_4$. Anodic oxidation and chemical oxidation of graphite in $H_2SO_4$ generally leads to the formation of intercalation compounds of the ionic salt type through incorporation of $H_2SO_4^-$ions and $H_2SO_4$ molecules into the graphite. Several other reactions also accur at various points of the charging cycle. But there is no satisfactory kinetics and mechanism of intercalationin graphite. We have studied them with anodic oxidation and chemical oxidation. We found six distinct phenomena between 2nd stage and 1st stage in chemical oxidation. We examined them in detail by the following in the measurements electrical oxidation. X-ray diffractions UV-Vis spectroscopy density measurements. We could obtained a equation for kinetic according to the reaction rate from this results and mechanism of intercalation between 2nd stage and 1st stage with hydrogen sulfate in graphite. Three thesis were written for the mechanism of intercalation compounds in graphite with hydrogen sulfate ; first thesis is anodic oxidation second thesis is chemical oxidation and definition of transit phase between 2nd etc the third thesis is the kinetic mechanism of intercalation compounds in graphite with Hydrogen sulfate. This thesis is the first paper among three thesis as anodic oxidation.

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The Characteristics of Atrazine Decomposition by Photo-chemical Oxidation Process (광화학적 산화처리에 의한 Atrazine 분해 특성)

  • Choi, Hyun-Jin;Park, Jong-Il;Lee, Tae-Jin
    • Journal of Korean Society of Environmental Engineers
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    • v.27 no.8
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    • pp.829-836
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    • 2005
  • In this study, the characteristics of atrazine decompositon with photo-chemical oxidation process was investigated by the oxidation products analysis. The main products of the process were OIET(2-hydroxy-4-ethylamino-6-isopropylamino s-triazine), OIAT(2-hydroxy-4-amino-6-isopropylamino s-triazine) and OAAT(2-hydroxy-4,6-diamino-s-triazine), resulting i n dechlorination or hydroxylation as the main mechanism of the photo-chemical oxidation process. Through the material balance analysis of TOC and chloride ion in the aqueous solution, it was concluded that mineralization of the atrazine was not occurred but the dechlorination of atrazine had been completed.

Effect of Pre-oxidation of Pitch by H2O2 on Porosity of Activated Carbons (과산화수소에 의한 산화가 핏치계 활성탄소의 기공성질에 미치는 영향)

  • Kim, Young-Ha;Park, Soo-Jin
    • Applied Chemistry for Engineering
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    • v.21 no.2
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    • pp.183-187
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    • 2010
  • Activated carbons (ACs) have been prepared from pitch by the combination of a chemical oxidation with different $H_2O_2$ concentrations i.e., 5, 15, and 25 wt% and a chemical activation with KOH at a constant KOH/pitch ratio of 3/1. The influence of $H_2O_2$ solution on the microporous properties of the pitch and the final activated carbons were invested using XRD, FT-IR, XPS, $N_2$-adsorption, and SEM. XRD indicated that the value of interplanar distance $d_{002}$ increased by chemical oxidation. FT-IR and XPS results showed that the chemical oxidation promoted the formation of surface oxygen functionalities. Also, the specific surface area of the resulting ACs was increased with increasing the concentration of $H_2O_2$ chemical oxidation and showed a maximum value of $2111m^2/g$ at 25 wt% $H_2O_2$ concentration.

Evaluation of Remediation Efficiency of In-Situ Chemical Oxidation Technology Applying Micro Bubble Ozone Oxidizer Coupled with Pneumatic Fracturing Equipment (마이크로버블 오존 산화제와 공압파쇄 장치를 연계 적용한 지중 화학적 산화법의 정화효율 평가)

  • Oh, Seung-Taek;Oh, Cham-Teut;Kim, Guk-Jin;Seok, So-Hee;Kim, Chul-Kyung;Lim, Jin-Hwan;Ryu, Jae-Bong;Chang, Yoon-Young
    • Journal of Soil and Groundwater Environment
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    • v.17 no.4
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    • pp.44-50
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    • 2012
  • A new type of chemical oxidation technology utilizing micro bubble ozone oxidizer and a pneumatic fracturing equipment was developed to enhance field applicability of a traditional chemical oxidation technology using hydrogen peroxide as an oxidizer for in-situ soil remediation. To find an efficient way to dissolve gaseous ozone into hydrogen peroxide, ozone was injected into water as micro bubble form then dissolved ozone concentration and its duration time were measured compared to those of simple aeration of gaseous ozone. As a result, dissolved ozone concentration in water increased by 31% (1.6 ppm ${\rightarrow}$ 2.1 ppm) and elapsed time for which maximum ozone concentration decreased by half lengthened from 9 min to 33 min. When the developed pneumatic fracturing technology was applied in sandy loam, cracks were developed and grown in soil for 5~30 seconds so that the radius of influence got longer by 71% from 392 cm to 671 cm. The remediation system using the micro bubble ozone oxidizer and the pneumatic fracturing equipment for field application was made and demonstrated its remediation efficiency at petroleum contaminated site. The system showed enhanced remediation capacity than the traditional chemical oxidation technology using hydrogen peroxide with reduced remediation time by about 33%.

Feasibility Study on Remediation for Railroad-contaminated Soil with Waste-lubricant (윤활유 유래 철도 오염토양의 정화방법 연구)

  • Park, Sung-Woo;Shin, Min-Chul;Jeon, Chil-Sung;Baek, Ki-Tae;Lee, Jae-Young
    • Journal of Soil and Groundwater Environment
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    • v.13 no.2
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    • pp.30-35
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    • 2008
  • In this study, the feasibility of soil washing, chemical oxidation and sonication was investigated to treat lubricantcontaminated railroad soil. Tergitol, a non-ionic surfactant, was used as a washing agent with or without iso-propyl acohol as a cosolvent. However, it was not effective to remove lubricant from soil even though tergitol was the most effective washing agent for diesel-contaminated soil. The cosolvent reduced the overall washing efficiency. Chemical oxidation removed 30% of lubricant from contaminated soil. Soil washing after chemical oxidation extracted additionally 16-17% of lubricant. Sonication enhanced-soil washing showed enhanced overall efficiency of soil washing. Lubricant-contaminated soil should be remediated by the other technology used for diesel-contaminated soil.

Enhancement of Biodegradation Rate of Petroleum Hydrocarbons-contaminated Soil with Addition of Organic Composite Nutrients and a Chemical Oxidation (유기성 영양분 첨가 및 화학적 산화 연계를 통한 유류오염 토양의 생물학적 정화효율 향상에 관한 연구)

  • Kim, Guk-Jin;Oh, Seung-Taek;Lee, Cheol-Hyo;Seo, Sang-Ki;Kang, Chang-Hwan;Chang, Youn-Young
    • Journal of Soil and Groundwater Environment
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    • v.13 no.3
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    • pp.59-66
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    • 2008
  • A biological study was conducted to evaluate the enhancement of landfarming of soil contaminated with petroleum hydrocarbon (TPH) applying organic composite nutrients and a chemical oxidation during bioremediation. The target value of soil TPH after treatment was 500 mg/kg TPH. Addition of an organic compost and liquid swine manure for the removal of soil THP showed higher efficiency as 84.4% and 92.2% respectively than inorganic nutrients of 80.2%. In addition to the removal of non-biodegradable portion of residual hydrocarbons in soil, a chemical oxidation was applied during tailing period of the biological remediation, which showed high remediation efficiency as 98.1% compared with single bioremediation efficiency of 84.7%.

Treatment of Photographic Wastewater by Chemical Oxidation and Biological Treatment process (화학적산화 및 생물학적처리법에 의한 사진폐액의 처리)

  • 정경훈;최형일
    • Journal of Environmental Health Sciences
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    • v.23 no.1
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    • pp.34-42
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    • 1997
  • A laboratory experiments were performed to investigate the treatment of photographic processing wastewater by chemical oxidation and biological treatment system. The effect of reaction conditions such as hydrogen peroxide dosage, ferrous sulfate dosage and pH on the COD removal in Fenton oxidation were investigated. The optimal dosage of hydrogen peroxide was 2.58 M and 3.87 M for the developing and fixing process wastewater, respectively. The Fenton oxidation was most efficient in the pH range of 3-5 and the optimal condition for initial reaction pH was 5 for a developing process wastewater. With iron powder catalyst, the COD for a developing process wastewater was removed in lower pH than with ferrous sulfate catalyst. The removal efficiency of COD for refractory compounds such as Diethyleneglycol, Benzylalcohol, Hydroxylamine Sulfate, Ammonium Thiosulfate, Ammonium Ferric EDTA and Disodium EDTA in the photogaphic wastewater was found than 90% except Potassium Carbonate. When the photographic processing wastewater after pretreatment by Fenton oxidation was treated with batch activated sludge process, the addition of $KH_2PO_4$ as a phosphorous compound improved the removal efficiency of COD. During the continuous biological treatment of developing and fixing process wastewater after pretreatment by Fenton oxidation, the effluent COD concentration less than 100 mg/l was obtained at 0.425 and 0.25 kgCOD/m$^3$.d, respectively.

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