Process for preparing saline-alkali soil conditioner from 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 non-environmental protection of saline-alkali soil improvers, and achieve low-cost and environmentally friendly effects

Active Publication Date: 2021-02-02
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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  • Process for preparing saline-alkali soil conditioner from solid waste
  • Process for preparing saline-alkali soil conditioner from solid waste
  • Process for preparing saline-alkali soil conditioner from 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

Combining the advantages of rich waste biomass and phosphogypsum resources in my country and the serious soil salinization status in my country, the present invention establishes a new process suitable for preparing an environmentally friendly saline-alkali soil improver from waste biomass and phosphogypsum. In this process, the waste biomass is mixed with a certain amount of phosphogypsum, then subjected to hydrothermal treatment under certain conditions, and centrifuged for solid-liquid separation to obtain the saline-alkali soil improver. The soil improver of the invention has a simple preparation process, is reproducible, and has low cost, can significantly reduce the salinization degree of soil, and improve soil fertility. The improving agent of the invention is prepared from waste biomass and phosphogypsum, and realizes clean resource utilization of waste biomass and phosphogypsum while efficiently improving saline-alkali soil.

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 Patents(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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