Enhancing Biological Treatability of Landfill Leachate by Chemical Oxidation

Kim, Yeong-Kwan; Huh, In-Ryang

doi:10.1089/ees.1997.14.73

Cited by 50 publications

(31 citation statements)

References 8 publications

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“…Under the optimal condition of 200 mg l −1 of H 2 O 2 and 300 mg l −1 of ferrous ion, 70% of residual COD in the UASB effluent was removed. Kim and Huh [10] employed Fenton oxidation to enhance biological treatability of landfill leachate. The ratio of BOD 20 /COD increased after the oxidation indicating Fenton oxidation could be effective prior to the biological process.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Fenton process for the treatment of landfill leachate

Zhang

Choi

Huang

2005

Journal of Hazardous Materials

357

174

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Section: Introductionmentioning

confidence: 99%

Optimization of Fenton process for the treatment of landfill leachate

Zhang

Choi

Huang

2005

Journal of Hazardous Materials

357

174

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“…The Fenton process, one of advanced oxidation processes (AOPs), has been widely applied to remove organic matter from landfill leachate as a pre-treatment or post-treatment process [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. However, conventional Fenton process cannot remove chemical oxygen demand (COD) efficiently from landfill leachate.…”

Section: Introductionmentioning

confidence: 99%

Removal of COD from landfill leachate by electro-Fenton method

Zhang

Zhou

2006

Journal of Hazardous Materials

276

120

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“…It has been used to decontaminate the organic wastewaters containing polychlorinated-biphenyls (PCBs) , dyes , dinitrotoluene (Mohanty and Wei, 1993), benzene, tuloene, xylene (BTX) , chlorinated aliphatic hydrocarbons (CAHs) (Tang and Huang, 1997), polycyclic aromatic hydrocarbons (PAHs) (Qiang et al, 2000), and landfill l eachates (Kim and Huh, 1997). In this process, concentrated H 2 O 2 has to be purchased, transported and stored.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Processes for In-Situ Treatment of Contaminated Soils - Final Report - 09/15/1996 - 01/31/2001

Huang¹

2001

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Contamination of soils by toxic organic pollutants is an environmental concern. The insitu electrokinetic (EK) technology is an emerging process to remediate the contaminated soils. Since the electro-osmotic (EO) flow rate and sorption behaviors of pollutants are two critical factors of the process, this study focuses on understanding the partition of nonionic organic contaminants in soil-water system, mechanisms of the EO flow, and the transport of organic compounds under an externally applied electrostatic field. The target compounds include chlorinated organic compounds and polycyclic aromatic hydrocarbons (PAHs). In order to improve the treatment efficiency, surfactant and bio-surfactant were used. A thermodynamic concept, fugacity, was introduced to illustrate the interactions between organics and the soil. A semi-empirical equation was derived to describe the EO flow rate in unsaturated soils. Moverover, the diffusion-advection-sorption model was used to simulate the transport of nonionic organic contaminants in the presence of an electrostatic field.The sorption experiments were conducted with various initial solute concentrations and different soil to solution ratios. The selected chlorinated organics include tetrachloroethylene (PCE), trichloroethylene (TCE), carbon tetrachloride, and chloroform. Results show that Langnuir isotherm can be used to express the distribution behavior of these chlorinated organic compounds i n the soil-water system. In addition to the hydrophobicity (K ow ), the concentration of organic compound and soil to solution ratio can influence the distribution behavior also. In order to illustrate the effects of the organic concentration and soil to solution ratio, the activity coefficient was used.The activity coefficient, γ, a relative interaction based on chosen reference state, is a useful means to express the quantitative feature of the organic-soil interaction without detailed information of their interaction mechanisms. By comparing the activity coefficients, γ w and γ s (i.e., X s /X w ), one can illustrate the trend of organic distribution at the soil-water interfaces.The concentration effect can be explained by the changes in the adsorption of organic onto the soil surface. Based on the experimental results, when increasing the organic compound concentrations, the activity coefficient, γ w , can be considered as a constant and γ s increases due to the increase of interaction energy. The change of γ s makes the sorption isotherms of PCE, TCE, carbon tetrachloride, and chloroform non-linear. According to γ s , it can be seen that the sorption between these selceted chlorinated organics and the soil is exothermic.The effect of soil to solution ratio can be attributed to the presence of dissolved organic matter (DOM) in the liquid phase. DOM enhances the organic dissolution, which in turns increases the organic concentration, i.e., X w . Therefore, the partition coefficients of these chlorinated compounds, i.e., X s /X w , decrease with increasing the soil to solution ...

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Enhancing Biological Treatability of Landfill Leachate by Chemical Oxidation

Cited by 50 publications

References 8 publications

Optimization of Fenton process for the treatment of landfill leachate

Optimization of Fenton process for the treatment of landfill leachate

Removal of COD from landfill leachate by electro-Fenton method

Electrochemical Processes for In-Situ Treatment of Contaminated Soils - Final Report - 09/15/1996 - 01/31/2001

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