Biomass saline-alkali soil modifier

Abstract

The invention discloses a biomass saline-alkali soil modifier, relates to a saline-alkali soil modifier, and belongs to the field of soil improvement. In order to solve the technical problems that an existing saline-alkali soil modifier easily causes secondary pollution and is short in lasting period, the biomass saline-alkali soil modifier is prepared from, by mass, 20%-65% of dry-basis agriculture and forestry biomass acid processing residues, 5%-50% of dry-basis biomass fermentation residues and 30%-70% of water. The bulk density of the dry-basis agriculture and forestry biomass acidic processing residues and the dry-basis biomass fermentation residues after being mixed in proportion is not greater than 600kg / m < 3 >. The soil conditioner disclosed by the invention is a full-biomass-based composite conditioner, and biomass processing residues are used as raw materials, so that the soil conditioner is low in price and environment-friendly; a simple and green soil improvement method is used, and energy consumption is low; according to the soil improvement technology, the pH value of the soil is remarkably reduced, and the air permeability is remarkably improved.

Description

Technical Field

[0001] The present invention relates to a saline-alkali soil conditioner, belonging to the field of soil improvement. Background Art

[0002] Saline-alkali soils are widely distributed globally. According to statistics, the land area covered by different types of saline-alkali soils worldwide accounts for almost 10% of the total land area. These saline-alkali soils are rich in salt, dry, and compacted, which is not conducive to plant growth and is often in a barren state. Treating saline-alkali soils is beneficial to avoid the further deterioration of saline-alkali soils, repair the ecological environment in saline-alkali vulnerable areas, and is of great significance for promoting the construction of civilization. The basic methods for improving saline-alkali soils include reducing alkalinity, improving the physical properties of saline-alkali soils, fertilizing the soil, and increasing yields through planting. Among them, adding organic materials to saline-alkali soils is a measure that "kills three birds with one stone" for saline-alkali soil improvement: neutralizing the alkaline components in the soil, improving the physical properties of saline-alkali soils, and increasing soil organic matter to achieve soil fertilization.

[0003] Currently, the following problems generally exist in current saline-alkali soil conditioners:

[0004] (1) Chemical conditioners (such as gypsum, sulfur) are prone to causing secondary pollution and have a short effective period;

[0005] (2) Organic conditioners (humic acid-based) rely on fossil resources for raw materials, resulting in high costs;

[0006] (3) Single-function conditioners cannot simultaneously solve the problems of reducing alkalinity, soil compaction, and low microbial activity. Summary of the Invention

[0007] The purpose of the present invention is to provide a biomass saline-alkali soil conditioner to solve the technical problem that existing saline-alkali soil conditioners are prone to causing secondary pollution and have a short effective period.

[0008] The biomass saline-alkali soil conditioner is composed of 20%-65% dry-based agroforestry biomass acidic processing residues, 5%-50% dry-based biomass fermentation residues, and 30%-70% water by mass percentage. After the dry-based agroforestry biomass acidic processing residues and the dry-based biomass fermentation residues are mixed in proportion, the bulk density is not greater than 600 kg / m 3 .

[0009] The agroforestry biomass acidic processing residues are dry-based xylose residues, dry-based furfural residues, dry-based acid pulping residues, or dry-based residues remaining after ethanol fermentation from straw with a pH value not greater than 5.0.

[0010] The agroforestry biomass acidic processing residues are dry-based xylose residues, dry-based furfural residues, dry-based acid pulping residues, or dry-based residues remaining after ethanol fermentation from straw with a pH value of 2.2-4.0.

[0011] The dry - based acid - pulping residue refers to the residue remaining after plant fiber raw materials are treated under high temperature and high pressure by organic acid or inorganic acid methods to separate cellulose fibers, and also includes the acidic residue remaining after further separating lignin from this residue.

[0012] The biomass fermentation residue is dry - based distiller's grains, dry - based mash liquid or dry - based biogas fermentation sludge with a nitrogen element content of not less than 1%.

[0013] The present invention relates to a composite saline - alkali soil conditioner mainly composed of inexpensive biomass acidic - processing residues and biomass fermentation residues. This conditioner is rich in acids, organic carbon, nitrogen, etc., and can be naturally degraded, achieving the synergistic effects of soil pH regulation, structure repair, and fertility improvement, while also increasing the soil carbon sequestration amount.

[0014] The purpose of the present invention is to use degradable biomass for saline - alkali soil improvement, and provides a fully - biomass composite saline - alkali soil conditioner mainly composed of agricultural and forestry biomass acidic - processing residues, fermentation residues, etc. Through the acids, organic carbon, and nitrogen rich in these biomass residues, the synergistic effects of soil pH regulation, structure repair, and fertility improvement are achieved.

[0015] Advantages of the present invention:

[0016] 1. Lignin contains polar groups such as phenolic hydroxyl, alcoholic hydroxyl, and carboxyl groups. Due to its high complexing ability, it can be used to improve the utilization efficiency of plant nutrients in the soil.

[0017] 2. Lignin has the ability to regenerate through photosynthesis under natural conditions, and its regeneration rate is about 50 billion tons / year.

[0018] Beneficial effects of the present invention:

[0019] (1) The soil conditioner of the present invention is a fully - biomass - based composite conditioner. The raw materials used are biomass processing residues, which are inexpensive and environmentally friendly.

[0020] (2) It uses a simple and green soil improvement method with low energy consumption.

[0021] (3) The soil improvement technology used in the present invention significantly reduces the soil pH value and significantly improves the soil air permeability. Description of the drawings

[0022] Figure 1 is the control chart of Experiment 1 and Experiment 2;

[0023] Figure 2 is the growth status chart of alfalfa in autumn in Experiment 1;

[0024] Figure 3 is the growth status chart of alfalfa in autumn in Experiment 2. Detailed implementation manners

[0025] The technical solution of the present invention is not limited to the specific implementation manners listed below, and also includes any combination among the specific implementation manners.

[0026] Specific implementation manner one: The biomass saline-alkali soil conditioner in this implementation manner is composed of 20%-65% dry-base agroforestry biomass acidic processing residues, 5%-50% dry-base biomass fermentation residues and 30%-70% water by mass percentage. After the dry-base agroforestry biomass acidic processing residues and the dry-base biomass fermentation residues are mixed in proportion, the bulk density is not greater than 600 kg / m 3 .

[0027] Specific implementation manner two: The difference between this implementation manner and the first specific implementation manner is that the agroforestry biomass acidic processing residues are dry-base xylose residues, dry-base furfural residues, dry-base acid pulping residues or dry-base residues remaining after ethanol fermentation from straw with a pH value not greater than 5.0. Others are the same as the first specific implementation manner.

[0028] Specific implementation manner three: The difference between this implementation manner and the first or second specific implementation manner is that the agroforestry biomass acidic processing residues are dry-base xylose residues, dry-base furfural residues, dry-base acid pulping residues or dry-base residues remaining after ethanol fermentation from straw with a pH value of 2.2-4.0. Others are the same as the first or second specific implementation manner.

[0029] Specific implementation manner four: The difference between this implementation manner and any one of the first to third specific implementation manners is that the dry-base acid pulping residues refer to the residues remaining after plant fiber raw materials are treated under high temperature and high pressure by organic acid or inorganic acid method and cellulose fibers are separated, and also include the acidic residues remaining after lignin is further separated from the residues. Others are the same as any one of the first to third specific implementation manners.

[0030] Specific implementation manner five: The difference between this implementation manner and any one of the first to fourth specific implementation manners is that the biomass fermentation residues are dry-base distiller's grains, dry-base mash or dry-base biogas fermentation sludge with a nitrogen element content not less than 1%. Others are the same as any one of the first to fourth specific implementation manners.

[0031] Specific implementation manner six: The difference between this implementation manner and any one of the first to fifth specific implementation manners is that the biomass fermentation residues are dry-base corn distiller's grains with a nitrogen element content not less than 1%. Others are the same as any one of the first to fifth specific implementation manners.

[0032] The following experiments are used to verify the effect of the present invention:

[0033] Experiment one:

[0034] Biomass saline-alkali soil conditioner, consisting of 5 tons of furfural residues with a moisture content of 64% and a pH value of 2.2, and 2 tons of corn distillers grains with a moisture content of 70%. It is converted into 1.8 tons of dry-based furfural residues, 0.6 tons of dry-based corn distillers grains (nitrogen element content 3.22%), 4.6 tons of water, and the dry-based specific gravity (bulk density) is 263 kg / m 3 .

[0035] Apply the biomass saline-alkali soil conditioner to improve 1 mu of saline-alkali soil sample with a pH value of 10.0 in Anda City, Heilongjiang Province. In the early spring, evenly spread the above-mentioned mass of the whole biomass composite soil conditioner on the surface of the saline-alkali land, use a rotary tiller to rotary till and stir the surface soil, and then sow alfalfa grass seeds. The growth status comparison of alfalfa grass in autumn can be seen in the attached drawings of the specification.

[0036] Experiment 2:

[0037] Biomass saline-alkali soil conditioner, consisting of 3 tons of acid pulping residues with a moisture content of 30% and a pH value of 3.5, and 2 tons of corn wine mash liquid with a moisture content of 80%. It is converted into 2.1 tons of dry-based acid pulping residues, 0.4 tons of dry-based corn wine mash (nitrogen element content 3.22%), 2.5 tons of water, and the dry-based specific gravity (bulk density) is 464 kg / m 3 .

[0038] Apply the biomass saline-alkali soil conditioner to improve 1 mu of saline-alkali soil sample with a pH value of 10.0 in Anda City, Heilongjiang Province. In the early spring, evenly spread the above-mentioned mass of the whole biomass composite soil conditioner on the surface of the saline-alkali land, use a rotary tiller to rotary till and stir the surface soil, and then sow alfalfa grass seeds. The growth status comparison of alfalfa grass in autumn can be seen in the attached drawings of the specification.

[0039] Experiment 3:

[0040] Biomass saline-alkali soil conditioner, consisting of 6.0 tons of xylose residues with a moisture content of 33% and a pH value of 4.2, and 1.0 ton of fermentation residues with a moisture content of 65%. It is converted into 4.0 tons of dry-based xylose residues, 0.35 tons of dry-based fermentation sludge (nitrogen element content 1.60%), 2.6 tons of water, and the dry-based specific gravity (bulk density) is 407 kg / m 3 .

[0041] Apply the biomass saline-alkali soil conditioner to improve 1 mu of saline-alkali soil sample with a pH value of 10.0 in Anda City, Heilongjiang Province. In the early spring, evenly apply the above-mentioned mass of the whole biomass composite soil conditioner on the surface of the saline-alkali land, use a rotary tiller to rotary till and stir the surface soil, and then sow alfalfa grass seeds. As a result, the alfalfa grass grows lushly.

[0042] Experiment 4:

[0043] Biomass saline-alkali soil conditioner, which consists of 4.0 tons of acid residue after delignification with a moisture content of 31% and a pH value of 3.8, and 1.0 ton of fermented waste residue with a moisture content of 61%. After conversion to dry basis, it is 2.76 tons of acid residue after delignification, 0.39 tons of dry basis fermented waste residue (nitrogen element content 1.35%), and 1.85 tons of water. The dry basis specific gravity (bulk density) is 585 kg / m 3 .

[0044] Apply the biomass saline-alkali soil conditioner to improve 1 mu of saline-alkali soil sample with a pH value of 10.0 in Anda City, Heilongjiang Province. In the early spring, apply the above-mentioned quality of the whole biomass composite soil conditioner evenly on the surface of the saline-alkali soil, and use a rotary tiller to till and stir the surface soil, and then sow alfalfa grass seeds. As a result, the alfalfa grass grows vigorously.

Claims

1. A biomass saline-alkali soil conditioner, characterized in that The biomass saline-alkali land conditioner is composed of 20%-65% dry basis agroforestry biomass acidic processing residues, 5%-50% dry basis biomass fermentation residues and 30%-70% water by mass percentage. After the dry basis agroforestry biomass acidic processing residues and the dry basis biomass fermentation residues are mixed in proportion, the bulk density is not more than 600 kg / m 3 .

2. The biomass saline-alkali land conditioner according to claim 1, wherein The agroforestry biomass acid processing residues are dry-based xylose residues, dry-based furfural residues, dry-based acid pulping residues or dry-based residues remaining after ethanol production from straw fermentation with a dry basis pH value not greater than 5.

0.

3. The biomass saline-alkali soil conditioner according to claim 1, characterized in that The agroforestry biomass acid processing residues are dry-based xylose residues, dry-based furfural residues, dry-based acid pulping residues or dry-based residues remaining after ethanol production from straw fermentation with a dry basis pH value of 2.2 - 4.

0.

4. The biomass saline-alkali land conditioner according to claim 2 or 3, wherein The dry-based acid pulping residues refer to the residues remaining after plant fiber raw materials are treated under high temperature and high pressure by organic acid or inorganic acid methods and cellulose fibers are separated, and also include the acidic residues remaining after lignin is further separated from the residues.

5. The biomass saline-alkali land conditioner according to claim 1, wherein The biomass fermentation residues are dry-based distiller's grains, dry-based mash or dry-based biogas fermentation sludge with a nitrogen element content not less than 1%.

6. The biomass saline-alkali soil conditioner according to claim 1, characterized in that The biomass fermentation residues are dry-based corn distiller's grains with a nitrogen element content not less than 1%.

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