Assessment of the chemical, microbiological and toxicological aspects of post-processing water from underground coal gasification

Pankiewicz-Sperka, Magdalena; Stańczyk, Krzysztof; Płaza, Grażyna; Kwaśniewska, Jolanta; Nałęcz‐Jawecki, Grzegorz

doi:10.1016/j.ecoenv.2014.06.036

Cited by 13 publications

(5 citation statements)

References 39 publications

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“…Moreover, since the raw coal undergoes complex physical and chemical changes upon underground gasification, the macromolecules in the coal easily crack to form tiny molecular benzene rings, aliphatic chain hydrocarbons, aromatic hydrocarbons, tar, and other harmful pollutants. This complicates the composition of the resulting gas. − …”

Section: Resultsmentioning

confidence: 99%

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

et al. 2022

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The potential pollution risk of underground coal gasification (UCG) has become a key factor restricting the development of UCG industrialization. Therefore, studying the migration and diffusion behavior of harmful pollutants is of great significance for preventing UCG pollution. In this paper, a large-scale three-dimensional similar simulation experimental device for UCG is used to simulate the gasification of Tianjin fat coal under actual working conditions. The rock layer around the simulated coal seam was sampled after the gasification was completed, the contaminants in the samples were examined by XRD, and the changes in the relative content of the contaminants at different sampling points were studied by FTIR. The results showed that benzene, phenols, aldehydes, aromatic hydrocarbons, and aromatic heterocyclic compounds remained after the gasification of No. 7 sampling point in Qianjiang, Tianjin, and that the main pollutants were aromatic hydrocarbons. The migration and enrichment of phenol and aldehyde pollutants were about the same on the east and west sides of the gasification center, while benzene pollutants were more easily migrated and enriched than aromatic heterocyclic compounds. The migration distance of phenolic pollutants on the south side of the gasification area is smaller than that of other pollutants and their maximum vertical distance from the gasification reaction area to the south is about 0.7 m. The results can provide a scientific basis for pollutant risk identification and prevention and control in the later UCG field test.

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Section: Resultsmentioning

confidence: 99%

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

et al. 2022

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“…In our study, for a better comparison of the FIP of examined powder, they are shown in a specially prepared chart. For this purpose, the MTC values have been converted into units of toxicity: TU = 100/MTC, and then the percentage TU was calculated for each strain by taking the TU value for the most sensitive strain as 100% [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

Selected Quality Attributes of Freshwater Mussel Powder as a Promising Ingredient for Pet Food

Konieczny

Andrzejewski

Yang

et al. 2021

Animals

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The aim of this study was to describe the quality attributes of a freeze-dried preparation obtained from freshwater mussel Sinanodonta woodiana (SW) soft tissue in respect to its potential as a novel pet food ingredient. After ecotoxicological testing of the raw material with MARA (Microbial Assay for Risk Assessment), the basic physico-chemical properties of the powder, such as approximate composition, bulk density, color parameters, water activity, electrophoretic analysis (SDS-PAGE), solubility, gelling and emulsifying capacity, were analyzed. The powder with a water activity of 0.43 offers a toxically safe preparation that contains over 34% protein/100 g of dry matter (DM). The SDS-PAGE profile showed twelve protein bands with a molecular weight (MW) ranging from >250 to 10 kDa. Taurine content has been estimated at an essential amount above 150 mg/100 g of DM. The powder possessed desirable emulsifying properties with 230 mL per 1 g and demonstrated the ability to form a firmer gel with a strength of 152.9 g at a temperature above 80 °C with at least 10% protein content. The L*, a*, and b* values characterizing powder color were found to be 69.49, 16.33, and 3.86, respectively. The SW mussel powder seems to be a promising ingredient that can be added with other binding or gelling agents in order to improve both the taste and acceptance of the final pet food products.

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“…Many researchers have carried out experimental studies on tar behaviors in UCG, including lab test [10][11][12][13][14] and field test [15][16][17][18][19][20]. Kumari et al [10,11] studied the CO 2 dry reforming of tar through lab-scale ex-situ experiment, and found the catalytic effect of coal char on the tar conversion to light gas, which offers a new method to improve the product gas quality.…”

Section: Introductionmentioning

confidence: 99%

“…Mandal et al [13] uses FTIR method to study the chemical bonds and molecular structure of tar from lab UCG experiment. Researchers from the Central Mining Institute (Poland) [14] studied the environmental risk of the waste water in lab tests, and found high toxicity from both organic and inorganic content in the waste water. Zhou et al [15] investigated the effect of pyrolysis temperature, operating pressure, water influx, and gasification agent injection on the production, viscosity, and compound content of tar from UCG trial at Inner Mongolia, China.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Tar Samples from Reaction Zone and Outlet in Ex-Situ Underground Coal Gasification Experiment

Dong

et al. 2021

Energies

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Tar remaining in the gasification cavity during underground coal gasification (UCG) is an important pollution source, while the reported studies only focus on the tar behavior at the outlet. The present work aims to compare the tar properties from the reaction zone and the outlet, analyze the tar evolution during gasification, and discuss possible measures to control tar pollution. Tar was sampled with a self-developed equipment from an ex-situ underground coal gasification experimental system and analyzed by GC-MS. The gas composition, temperature, and PM10 were also compared for the reaction zone and the outlet. Compared with the tar from reaction zone, the tar from outlet has a smaller percentage of high boiling point content, PAHs, C, O, N, S, Cl, Si, and a larger percentage of H. The PAHs percentage in tar at the outlet in this work is closer to the field data than the lab data from literature, indicating the experimental system gives a good simulation of tar behavior in underground coal gasification. Condensation due to a fast temperature drop is one of the main reasons for PAHs decreasing. Tar cracking and soot formation also cause the decrease of heavy tar, proven by the light gas and particulate matter results.

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Assessment of the chemical, microbiological and toxicological aspects of post-processing water from underground coal gasification

Cited by 13 publications

References 39 publications

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

Selected Quality Attributes of Freshwater Mussel Powder as a Promising Ingredient for Pet Food

Comparison of Tar Samples from Reaction Zone and Outlet in Ex-Situ Underground Coal Gasification Experiment

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