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Novel process of preparing saline-alkali soil modifier using solid waste

A technology for solid waste and saline-alkali soil, applied in the field of solid waste treatment and disposal, can solve the problems of high price and unenvironmental protection of saline-alkali soil conditioner, and achieve the effect of low cost and environmental friendliness

Active Publication Date: 2017-07-07
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the large amount of saline-alkali soil in our country and the current situation that the existing saline-alkali soil amendments are expensive and not environmentally friendly, combined with the advantages of rich waste biomass and phosphogypsum resources in my country, the present invention establishes a method for preparing waste biomass and phosphogypsum. A new technology of in-situ conditioner for saline-alkali soil

Method used

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  • Novel process of preparing saline-alkali soil modifier using solid waste
  • Novel process of preparing saline-alkali soil modifier using solid waste
  • Novel process of preparing saline-alkali soil modifier using solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Material preparation

[0030] Crush the corn stalks to less than 5mm for later use. Phosphogypsum was taken from a phosphate fertilizer factory in Shandong (main impurities and their content: soluble P 2 o 5 0.11%; insoluble P 2 o 5 0.02%;Al 2 o 3 1.35%; Fe 2 o 3 0.10%; SiO 2 2.4% and Na 2 0.01%). The saline-alkali soil was taken from Weifang, Shandong (salinity 6.5‰, pH value 8.9, belonging to severe saline-alkali soil)

[0031] 2. Preparation of modifier

[0032] 1) Mix corn stalks (dry basis), phosphogypsum, and water in a ratio of 4:1:20, then mechanically stir for 30 minutes;

[0033] 2) After the mixture is transferred to the hydrothermal reactor, it is sealed;

[0034] 3) Heat the reactor to 220°C for hydrothermal treatment, stop heating after 40 minutes of hydrothermal treatment, and naturally cool to room temperature;

[0035] 4) The solid product obtained after the mixture in the reactor is subjected to centrifugal solid-liquid separation...

Embodiment 2

[0062] In addition to using pig manure instead of corn stover.

[0063] In the preparation of the improver 3), the reactor was heated to 240°C for hydrothermal treatment, and the hydrothermal treatment time was 60 minutes;

[0064] In pot experiment 5, 1) add 0.6 gram of improver to 20 grams of soil and then mechanically stir for 30 minutes to make it fully mixed with the same as Example 1.

[0065] The analysis results are shown in Table 1 and Table 2.

example 3

[0067] In addition to improving agent preparation 3), the reactor was heated to 240 ° C for hydrothermal treatment, and the hydrothermal treatment time was 90 minutes;

[0068] In pot experiment 5, 1) add 0.5 gram of improver to 20 grams of soil and then mechanically stir for 30 minutes to make it fully mixed with the same as Example 1.

[0069] The analysis results are shown in Table 1 and Table 2.

[0070] Table 1. Improvement effect of amendments on saline-alkali soil.

[0071]

[0072]

[0073] Table 2. Effects of amendments on maize growth in saline-alkaline soils.

[0074] time Comparative Test Example 1 Example 2 Example 3 2 4.97 5.14 5.21 5.46 4 6.90 6.99 7.02 7.12 6 14.02 14.95 14.99 15.27 8 24.12 26.20 26.41 27.65 10 29.89 32.23 33.25 35.24 12 33.45 34.59 35.68 37.24 14 34.52 35.64 36.98 37.95

[0075] As can be seen from Table 1, adding the improver prepared by the present inventio...

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Abstract

The invention discloses an environment-friendly novel process of a saline-alkali soil modifier suitable for waste biomass and ardealite preparation. The advantage of rich waste biomass and ardealite resources in China and the current situation of severe soil alkalization in China are taken into consideration. According to the novel process of preparing the saline-alkali soil modifier using the solid waste, the hydro-thermal treatment is conducted on the mixture after the waste biomass and a certain amount of ardealite are mixed on specific conditions, and the saline-alkali soil modifier is obtained by centrifugation and solid-liquid separation. The saline-alkali soil modifier is simple in preparation process, capable of regenerating, low in cost and capable of reducing the soil alkalization of the soil and improving soil fertility. The modifier is prepared from the waste biomass and the ardealite, the saline-alkali soil is effectively improved, and the clean resource utilization on the waste biomass and the ardealite is achieved at the same time.

Description

technical field [0001] The invention relates to the treatment and disposal of solid waste, which belongs to the new technology of resource utilization of solid waste in the field of environmental protection and comprehensive utilization of resources, and is suitable for the high-addition of large quantities of agricultural waste straw, livestock and poultry manure, etc., and industrial waste phosphogypsum. Value resource utilization. Background technique [0002] Soil salinization is one of the important stress factors of current agricultural production. For a long time, the improvement and utilization of saline-alkali soil has been one of the hot issues in the field of global degraded land management. The improvement and utilization of saline-alkali land is a long-term and complex systematic project, the core of which is to reduce the harmful salinity of the soil and improve the soil environment required for crop growth and development. Aiming at the problem that tradition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K101/00C09K109/00
CPCC09K17/40C09K2101/00C09K2109/00
Inventor 刘振刚盖超
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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