[1]HUANG Diannan,JIAO Meiyi,LI Lin,et al.Water Infiltration and Redistribution of Improved Sand by Sludge Mixing[J].Research of Soil and Water Conservation,2020,27(01):189-196.
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Water Infiltration and Redistribution of Improved Sand by Sludge Mixing
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 01
Page number:
189-196
Column:
Public date:
2020-02-20
- Title:
- Water Infiltration and Redistribution of Improved Sand by Sludge Mixing
- Keywords:
- dewatered sludge; sandy soil; water infiltration; soil improvement
- CLC:
- S152.7+1
- DOI:
- -
- Abstract:
- To explore the effect of dewatered sludge from urban domestic sewage plants as soil amendments on wind erosion of sandy soil, determine an appropriate mixing proportion of sludge and sandy soil, the test was carried out by mixing centrifugal dewatered sludge with desert surface soil in proportions of 10%, 15%, 20%, 30%, and 50%. Water infiltration capacity, soil moisture content and soil water retention capacity were selected as indicators, the law of water infiltration and soil water retention in different ‘sludge-sand’ composite soils with different mixing ratios were studied to determine the optimum sludge blending ratio and the best water retaining layer. The results showed that the mixing ratio of sludge and sand had a great influence on the moisture infiltration wetting front; the ‘sludge-sand’ composite soil with a mixing ratio of 10% had the shortest infiltration time and the highest rate, while the composite soil with 30% and 50% mixing ratio had longer infiltration time and shorter rate; soil moisture cumulative infiltration under the different ratios of sludge and sand mixing decreased in the order: 10%(54.15 cm)>15%(47.12 cm)>20%(40.80 cm)>sand(34.97 cm)>30%(23.10 cm)>50%(12.68 cm). The relationship between cumulative infiltration and time followed Kostiakov soil water infiltration model. In the test of soil moisture content and redistribution of water in soil with different ratios of sludge and sand, the mixed sandy soil with 20% sludge is the best choice, and soil layer with the best water holding is 40—60 cm layer.
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Last Update:
2020-02-25