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Method for improving washed soil

A soil and leaching technology, used in the restoration of polluted soil, can solve the problems of soil water retention, poor fertilizer retention, fertility decline, nutrient loss, etc., and achieve the effect of increasing water retention capacity, high feasibility and low cost.

Inactive Publication Date: 2014-07-02
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while the leaching agent removes soil pollutants, the water and fertilizer retention capacity of the soil after leaching is poor, nutrients are lost, and fertility decreases.
[0003] At present, there are few reports on the improvement of leached soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] According to the hydrometer method, the proportion of sand grains of 0.025 mm in the leaching soil is determined. The leaching soil is 10 kg, and the sand grains larger than 0.025 mm are 6.8 kg. The added fungal chaff composite additive includes fungal chaff, biogas residue and fulvic acid, uniformly mixed according to 355:97:38, and its content is: 0.58 kg of decomposed fungal chaff, 0.16 kg of biogas residue, and 0.06 kg of fulvic acid.

Embodiment approach

[0020] 1. Determine the proportion of sand grains in the leaching soil of 0.025 mm according to the hydrometer method.

[0021] (1) Sample weighing: Weigh 50 grams of soil sample passing through a 2 mm sieve into a 500 ml Erlenmeyer flask;

[0022] (2) Disperse soil particles: According to the soil pH, choose the following dispersants respectively: 50 grams of calcareous soil samples, add 0.5mol / L sodium phosphate (Na3PO4) 60 ml; neutral soil samples 50 grams, add 0.25mol / L Sodium oxalate (Na2C2O4) 50ml, acid soil sample 50g, add 0.5mol / L sodium hydroxide (NaOH) 50ml. Add 250 ml of water to the Erlenmeyer flask, add the dispersant, shake well and let stand for 2 hours. Shake the Erlenmeyer flask, put a small funnel on the mouth of the bottle, place it on a hot plate to heat, and boil slightly for 1 hour. Shake the Erlenmeyer flask frequently during the boiling process to prevent soil particles from accumulating at the bottom of the bottle and forming hard lumps.

[0023] (3...

Embodiment 2

[0028] According to the hydrometer method, the proportion of sand grains of 0.025 mm in the leaching soil is determined. The leaching soil is 10 kg, and the sand grains larger than 0.025 mm are 4.0 kg. The added fungal chaff composite additive includes fungal chaff, biogas residue and fulvic acid, uniformly mixed according to 355:97:38, and its content is: 0.36 kg of decomposed fungal chaff, 0.10 kg of biogas residue, and 0.04 kg of fulvic acid.

[0029] Its implementation:

[0030] 1. Determine the proportion of sand grains in the leaching soil of 0.025 mm according to the hydrometer method.

[0031] (1) Sample weighing: Weigh 50 grams of soil sample passing through a 2 mm sieve into a 500 ml Erlenmeyer flask;

[0032] (2) Disperse soil particles: According to the soil pH, choose the following dispersants respectively: 50 grams of calcareous soil samples, add 0.5mol / L sodium phosphate (Na3PO4) 60 ml; neutral soil samples 50 grams, add 0.25mol / L Sodium oxalate (Na2C2O4) 50ml, ...

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Abstract

The invention discloses a method for improving washed soil, and relates to a method for improving soil. The method for improving washed soil comprises the following process: determining the proportion of sand granules of 0.025mm of washed soil according to a hydrometer method, when the proportion of sand granules greater than 0.025mm of the washed soil is 60%-80%, the additive amount of mushroom residue composite additives is 8wt%-10wt%; when the proportion of sand granules greater than 0.025mm of the washed soil is 40%-60%, the additive amount of mushroom residue composite additives is 3wt%-5wt%, and when the proportion of sand granules greater than 0.025mm of the washed soil is below 40%, the additive amount of mushroom residue composite additives is 1.5wt%-2.5wt%; and mushroom residue composite additive is formed by uniformly mixing mushroom residue after decomposition treatment, biogas residue and fulvic acid according to the mass ratio of 355:97:38. The method not only can be used for increasing the water retaining capacity of the washed soil, but also can replenish nutritional ingredients of the washed soil, meanwhile, is low in cost, has no engineering modification, and is high in feasibility in actual applications.

Description

technical field [0001] The invention relates to a method for improving soil, in particular to a method for improving rinsing soil. Background technique [0002] Soil is the most important material basis for agricultural production. However, with the increase in the types and quantities of industrial waste, agricultural chemical substances and urban pollutants in China, the degree of heavy metal pollution in my country's soil is intensifying, and the polluted area is expanding year by year. In the past 50 years, at least 20 million hm of heavy metal-polluted soil in my country 2 ; Pesticide pollution area is about 13 million to 16 million hm 2 . Due to the complexity of the environment in heavy metal-contaminated soils, decontamination of contaminated soils has become a challenging technical problem. After 30 years of research and application, it has developed rapidly. At present, a series of physical, chemical and biological technologies have been developed to treat soil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 侯永侠胡晓钧吴海东李玉双宋雪英陈红亮杨继松
Owner SHENYANG UNIV
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