التفاصيل البيبلوغرافية
| العنوان: |
EFFECTS OF FLY ASH, SILTY CLAY LOAM AND LOAMY SAND ON THE HYDRAULIC CONDUCTIVITY AND AIR PERMEABILITY OF COAL GANGUE. |
| المؤلفون: |
Min Chen, Xiaoyang Chen, He Huang, Benle Liu, Zhiyong Hu |
| المصدر: |
Fresenius Environmental Bulletin; Apr2018, Vol. 27 Issue 4, p2035-2042, 8p |
| مستخلص: |
Hydraulic conductivity and air permeability of surface soil in land reclamation using waste material has important implications for land restoration. Coal gangue, a waste material of coal extraction, is one of the most used materials in China for land reclamation. This material, however, consisting of rock fragments and having a high number of macropores, has high infiltration rates and poor water holding capacities. Coal gangue also contains heavy metal elements which are readily leached and pose environmental problems for local groundwater sources. In order to identify the most suitable soil matrix for land reclamation, we investigated the effects of coal ash, silty clay loam and loamy sand on infiltration and air permeability in coal gangue. Results of the van Genuchten model accurately fitted the water characteristic curves of samples and showed that the presence of coal ash and silty clay loam in coal gangue can improve the saturated moisture content. The formation of mixed matrices creates more flow channels in the soils and reduces cumulative infiltration and ks. Coal gangue mixed with silty clay loam effectively improves air permeability in the samples. ka values of coal gangue are less than those for the coal gangue-fly ash mixture (G-A) for low water content; coal gangue mixed with fly ash will decrease air permeability. We found that silty clay loam is the most effective medium to improve coal gangue properties. [ABSTRACT FROM AUTHOR] |
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