Removing Phenols from Post-Processing
Wastewater Originating from Underground Coal
Gasification Using Coagulation-Flocculation
and the H2O2/UV Process

Thomas, Maciej; Zdebik, D.; Niewiara, Ewa

doi:10.15244/pjoes/81270

Cited by 7 publications

(2 citation statements)

References 16 publications

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“…Many toxic compounds in UCG wastewater are challenging to decompose if only biological methods are used [130]. Thomas et al present the possibility of phenol removal from UCG effluents by using coagulation-flocculation and the H 2 O 2 /UV process [131]. Treatment of coal gasification wastewater by catalytic oxidation with trace ozone is another promising technique [132].…”

Section: Research Of Environmental and Health Impacts Of Underground ...mentioning

confidence: 99%

Investigation of Underground Coal Gasification in Laboratory Conditions: A Review of Recent Research

Kačur,

Laciak,

Durdán

et al. 2023

Energies

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The underground coal gasification (UCG) technology converts coal into product gas and provides the option of environmentally and economically attractive coal mining. Obtained syngas can be used for heating, electricity, or chemical production. Numerous laboratory coal gasification trials have been performed in the academic and industrial fields. Lab-scale tests can provide insight into the processes involved with UCG. Many tests with UCG have been performed on ex situ reactors, where different UCG techniques, the effect of gasification agents, their flow rates, pressures, and various control mechanisms to improve gasification efficiency and syngas production have been investigated. This paper provides an overview of recent research on UCG performed on a lab scale. The study focuses on UCG control variables and their optimization, the effect of gasification agents and operating pressure, and it discusses results from the gasification of various lignites and hard coals, the possibilities of steam gasification, hydrogen, and methane-oriented coal gasification, approaches in temperature modeling, changes in coal properties during gasification, and environmental risks of UCG. The review focuses on laboratory tests of UCG on ex situ reactors, results, and the possibility of knowledge transfer to in situ operation.

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Section: Research Of Environmental and Health Impacts Of Underground ...mentioning

confidence: 99%

Investigation of Underground Coal Gasification in Laboratory Conditions: A Review of Recent Research

Kačur,

Laciak,

Durdán

et al. 2023

Energies

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“…The extensive effort has been devoted to developing various cost-effective and environmentally friendly processes to removal of hazardous and refractory organic compunds from the wastewater. So far, integrated engineering systems including biological and chemical advanced treatment system as holistic approach have been considered to clean up of UCG wastewater [2,[8][9][10]. The development of an appropriate treatment method to remove pollutants from UCG wastewater is extremly important for the successful application of UCG technology in energy transformation.…”

Section: Introductionmentioning

confidence: 99%

Constructed wetland as a green remediation technology for the treatment of wastewater from underground coal gasification process

Jałowiecki,

Strugała-Wilczek,

Ponikiewska

et al. 2024

PLoS ONE

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The wastewater from underground coal gasification (UCG) process has extremely complex composition and high concentrations of toxic and refractory compounds including phenolics, aliphatic and aromatic hydrocarbons, ammonia, cyanides, hazardous metals and metalloids. So, the development of biological processes for treating UCG wastewater poses a serious challenge in the sustainable coal industry. The aim of the study was to develop an innovative and efficient wetland construction technology suitable for a treatment of UCG wastewater using available and low-cost media. During the bioremediation process the toxicity of the raw wastewater decreased significantly between 74%—99%. The toxicity units (TU) ranged from values corresponding to very high acute toxic for raw wastewater to non-toxic for effluents from wetland columns after 60 days of the experiment. The toxicity results correlated with the decrease of some organic and inorganic compounds such as phenols, aromatic hydrocarbons, cyanides, metals and ammonia observed during the bioremediation process. The removal percentage of organic compounds like BTEX, PAHs and phenol was around 99% just after 14 days of treatment. A similar removal rate was indicated for cyanide and metals (Zn, Cr, Cd and Pb). Concluded, in order to effectively assess remediation technologies, it is desirable to consider combination of physicochemical parameters with ecotoxicity measurements. The present findings show that wetland remediation technology can be used to clean-up the heavily contaminated waters from the UCG process. Wetland technology as a nature-based solution has the potential to turn coal gasification wastewater into usable recycled water. It is economically and environmentally alternative treatment method.

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Degradation of refractory organics in concentrated leachate by the Fenton process: Central composite design for process optimization

Güvenç

Varank

2020

Front. Environ. Sci. Eng.

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Removing Phenols from Post-Processing Wastewater Originating from Underground Coal Gasification Using Coagulation-Flocculation and the H2O2/UV Process

Cited by 7 publications

References 16 publications

Investigation of Underground Coal Gasification in Laboratory Conditions: A Review of Recent Research

Investigation of Underground Coal Gasification in Laboratory Conditions: A Review of Recent Research

Constructed wetland as a green remediation technology for the treatment of wastewater from underground coal gasification process

Degradation of refractory organics in concentrated leachate by the Fenton process: Central composite design for process optimization

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