煤矸石基多孔基质对土壤溶质运移的影响

doi:10.19964/j.issn.1006-4990.2024-0040

Abstract

Abstract:

The proposal was to address the issues of nutrient deficiency，drought，water scarcity，and lack of topsoil in mining areas by utilizing coal gangue to prepare a porous matrix.This matrix was then chosen as a substitute material for topsoil in ecological restoration.Furthermore，its feasibility was evaluated from the perspective of solute transport.The impact of coal gangue-based porous matrix on the migration characteristics of Cl^- and Na⁺ in soil was investigated through vertical column miscible displacement experiments，revealing the influence patterns of porous matrix on soil pore distribution and solute transport in saturated soil.The results indicated that the penetration time of Cl^- and Na⁺ was reduced when the content of the porous matrix ranged from 10% to 30%.It was due to the fact that the porous matrix with a small amount of doping filled the soil particles with one another，resulting in an increase in the number of small pores and the formation of a more complex migration path.Moreover，the porous matrix had a strong adsorption capacity for Na⁺，and thus the penetration time of Cl^- and Na⁺ was prolonged.As the addition of porous matrix continued to increase（>30%），the lower bulk density of the porous matrix led to an increase in saturated hydraulic conductivity，which in turn shortened the breakthrough time for Cl^-and Na⁺gradually.The application of 30% porous matrix resulted in a decrement of Cl^- and Na⁺ concentrations in the effluent by 1.65%~46.30% and 10.12%~32.88%，respectively.The transport of Cl^- and Na⁺ was primarily governed by convection.The distribution of soil pores and the adsorptive properties of the soil were the major factors affecting solute transport.The compound mode of mixing coal gangue-based porous matrix with loess at a volume ratio of 3∶7 could effectively reduce solute transport.

Key words: porous matrix, solute transport, breakthrough curve, CDE model, coal gangue

CLC Number:

TQ127.2

CHAI Chunjing, FENG Zhengjun, WU Haibin, SHI Xiaokai, ZHANG Junjie, SONG Huiping. Effect of coal gangue-based porous matrix on soil solute transport[J]. Inorganic Chemicals Industry, 2024, 56(9): 107-116.

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样品	ρ（Na⁺入流液）/（mg·L^-1）	ρ（Cl^-入流液）/（mg·L^-1）	ρ_b/ （g·cm^-3）	饱和含水量/（cm³·cm^-3）
T1	1 150	1 775	1.31	0.498 6
T2	1 150	1 775	1.26	0.520 1
T3	1 150	1 775	1.17	0.545 8
T4	1 150	1 775	1.08	0.563 3
T5	1 150	1 775	0.85	0.612 8

样品	平均孔隙流速（v）/（cm·h^-1）	水动力弥散系数（D）/（cm²·h^-1）	弥散度（λ）/ cm	佩克莱数（P_e）	决定系数（R²）	均方误差（MSE）
T1	1.599±0.025	0.343±0.188	0.215±0.123	139.700±60.455	0.998	1 167
T2	1.525±0.044	0.611±0.191	0.401±0.136	74.838±29.307	0.994	3 273
T3	1.473±0.061	0.580±0.332	0.394±0.251	76.156±36.985	0.999	485.2
T4	1.423±0.084	1.003±0.564	0.705±0.460	42.567±22.902	0.999	492.3
T5	3.524±0.323	11.496±0.729	3.262±0.435	9.196 ±1.451	1.000	133.5

样品	线性分配系数K_d	决定系数R²
T1	0.558±0.003	0.985
T2	0.743±0.007	0.991
T3	0.723±0.008	0.984
T4	0.840±0.013	0.983
T5	1.398±0.015	0.975

样品	延迟因子（R）	平均孔隙流速（v）/（cm·h^-1）	水动力弥散系数（D）/（cm²·h^-1）	弥散度（λ）/ cm	佩克莱数（P_e）	决定系数（R²）	均方误差（MSE）
T1	2.466±0.007	1.334±0.084	7.170±0.926	5.376±1.043	5.581±1.074	0.996	787
T2	2.806±0.018	1.335±0.129	8.760±1.528	6.562±1.690	4.572±1.071	0.990	1825
T3	2.553±0.008	1.019±0.081	9.930±0.579	9.747±1.207	3.078±0.395	0.976	3959
T4	2.611±0.025	1.324±0.107	7.590±0.644	5.732±0.954	5.234±0.809	0.991	1918
T5	2.939±0.012	3.153±0.331	25.790±2.478	8.181±1.536	3.667±0.635	0.993	1519

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Effect of coal gangue-based porous matrix on soil solute transport

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