A soil conditioner for improving the fertility of saline-alkali land and its application

Abstract

The invention relates to a soil conditioner for improving saline-alkali land fertility, and an application thereof. The invention belongs to the field of soil conditioners. The soil conditioner provided by the invention is prepared through the following steps: active sludge is dried, the dried sludge is crushed and the crushed sludge is sieved, such that active sludge powder is obtained; corn cobs are washed, the washed corn cobs are dried, the dried corn cobs are crushed and the crushed corn cobs are sieved, such that corn cob powder is obtained; the active sludge powder is mixed with the corn cob powder; pyrolysis is carried out for 1.5-4h at a temperature of 300-500 DEG C in a nitrogen atmosphere; and cooling is carried out, such that the soil conditioner is obtained. The soil conditioner provided by the invention is simple in preparation method. Corn cobs which are crop waste and active sludge which is discharged from a secondary sedimentation tank of a sewage treatment system are adopted as raw materials, such that cost is low, and the recycling of waste resources is realized. The soil conditioner can effectively improve the soil fertility of saline-alkali land, improve saline-alkali soil nutritional indicators, enhance soil nitrogen fixation capacity, and reduce soil pH value.

Description

technical field

[0001] The invention relates to a soil conditioner for improving the fertility of saline-alkali land and an application thereof, belonging to the field of soil conditioners. Background technique

[0002] According to the statistics of the second national soil census organized by the Ministry of Agriculture, the area of ​​saline soil in my country is 520 million mu. Among them, 240 million mu of saline soil, 12.9991 million mu of alkaline soil, and 270 million mu of salinized and alkalized soil. The large area and wide distribution of saline soil in my country are rare in the world. From the coast of the East China Sea on the Pacific coast to the Tarim and Jungar Basins in the west, from Hainan Island in the south to the Hulunbuir Plateau in the northernmost Inner Mongolia, there are saline soils everywhere. However, the arid climate conditions in Inner Mongolia have led to an increasing area of ​​saline-alkali land. At present, the area of ​​saline-alkali l...

Examples

Embodiment 1

[0036] A soil improver for improving the fertility of saline-alkali land, said soil improver is prepared by the following method:

[0037] Step 1. The activated sludge is naturally air-dried first, then pulverized by a sealed sample preparation grinder, and finally passed through a 100-mesh sieve and the activated sludge powder under the sieve is collected;

[0038] Step 2. The corn cob is first washed with deionized water, then air-dried naturally, then crushed by a high-speed universal grinder, and finally passed through a 10-mesh sieve to collect the corn cob powder under the sieve;

[0039]Step 3. After mixing 2.86g of activated sludge powder and 7.14g of corn cob powder evenly, put them into a tubular electric furnace with nitrogen, set the nitrogen rate to 300mL / min, and the heating rate to 15°C / min. Pyrolyze at a pyrolysis temperature of 325° C. for 3 hours, and cool to obtain the soil conditioner.

[0040] The pyrolysis temperature in step 3 of this implementation is ...

Embodiment 2

[0049] A soil improver for improving the fertility of saline-alkali land, said soil improver is prepared by the following method:

[0050] Step 1. The activated sludge is naturally air-dried first, then pulverized by a sealed sample preparation grinder, and finally passed through a 100-mesh sieve and the activated sludge powder under the sieve is collected;

[0051] Step 2. The corn cob is first washed with deionized water, then air-dried naturally, then crushed by a high-speed universal grinder, and finally passed through a 10-mesh sieve to collect the corn cob powder under the sieve;

[0052] Step 3. After mixing 2.86g of activated sludge powder and 7.14g of corn cob powder evenly, put them into a tubular electric furnace with nitrogen, set the nitrogen rate to 300mL / min, and the heating rate to 15°C / min. Pyrolyze at a pyrolysis temperature of 325° C. for 0.5 h, and cool to obtain the soil conditioner.

[0053] The pyrolysis time in step 3 of this implementation is 0.5h, an...

Embodiment 3

[0059] A soil improver for improving the fertility of saline-alkali land, said soil improver is prepared by the following method:

[0060] Step 1. The activated sludge is naturally air-dried first, then pulverized by a sealed sample preparation grinder, and finally passed through a 100-mesh sieve and the activated sludge powder under the sieve is collected;

[0061] Step 2. The corn cob is first washed with deionized water, then air-dried naturally, then crushed by a high-speed universal grinder, and finally passed through a 10-mesh sieve to collect the corn cob powder under the sieve;

[0062] Step 3. After mixing 1.67g of activated sludge powder and 8.33g of corn cob powder evenly, put it into a tubular electric furnace with nitrogen, set the nitrogen rate to 300mL / min, and the heating rate to 15°C / min. Pyrolysis at a pyrolysis temperature of 450° C. for 3 hours, and cooling to obtain the soil conditioner.

[0063] The mass ratio of activated sludge powder and corn cob powd...

technical field

[0001] The invention relates to a soil conditioner for improving the fertility of saline-alkali land and an application thereof, belonging to the field of soil conditioners. Background technique

[0002] According to the statistics of the second national soil census organized by the Ministry of Agriculture, the area of ​​saline soil in my country is 520 million mu. Among them, 240 million mu of saline soil, 12.9991 million mu of alkaline soil, and 270 million mu of salinized and alkalized soil. The large area and wide distribution of saline soil in my country are rare in the world. From the coast of the East China Sea on the Pacific coast to the Tarim and Jungar Basins in the west, from Hainan Island in the south to the Hulunbuir Plateau in the northernmost Inner Mongolia, there are saline soils everywhere. However, the arid climate conditions in Inner Mongolia have led to an increasing area of ​​saline-alkali land. At present, the area of ​​saline-alkali l...

Examples

Embodiment 1

[0036] A soil improver for improving the fertility of saline-alkali land, said soil improver is prepared by the following method:

[0037] Step 1. The activated sludge is naturally air-dried first, then pulverized by a sealed sample preparation grinder, and finally passed through a 100-mesh sieve and the activated sludge powder under the sieve is collected;

[0038] Step 2. The corn cob is first washed with deionized water, then air-dried naturally, then crushed by a high-speed universal grinder, and finally passed through a 10-mesh sieve to collect the corn cob powder under the sieve;

[0039]Step 3. After mixing 2.86g of activated sludge powder and 7.14g of corn cob powder evenly, put them into a tubular electric furnace with nitrogen, set the nitrogen rate to 300mL / min, and the heating rate to 15°C / min. Pyrolyze at a pyrolysis temperature of 325° C. for 3 hours, and cool to obtain the soil conditioner.

[0040] The pyrolysis temperature in step 3 of this implementation is ...

Embodiment 2

[0049] A soil improver for improving the fertility of saline-alkali land, said soil improver is prepared by the following method:

[0050] Step 1. The activated sludge is naturally air-dried first, then pulverized by a sealed sample preparation grinder, and finally passed through a 100-mesh sieve and the activated sludge powder under the sieve is collected;

[0051] Step 2. The corn cob is first washed with deionized water, then air-dried naturally, then crushed by a high-speed universal grinder, and finally passed through a 10-mesh sieve to collect the corn cob powder under the sieve;

[0052] Step 3. After mixing 2.86g of activated sludge powder and 7.14g of corn cob powder evenly, put them into a tubular electric furnace with nitrogen, set the nitrogen rate to 300mL / min, and the heating rate to 15°C / min. Pyrolyze at a pyrolysis temperature of 325° C. for 0.5 h, and cool to obtain the soil conditioner.

[0053] The pyrolysis time in step 3 of this implementation is 0.5h, an...

Embodiment 3

[0059] A soil improver for improving the fertility of saline-alkali land, said soil improver is prepared by the following method:

[0060] Step 1. The activated sludge is naturally air-dried first, then pulverized by a sealed sample preparation grinder, and finally passed through a 100-mesh sieve and the activated sludge powder under the sieve is collected;

[0061] Step 2. The corn cob is first washed with deionized water, then air-dried naturally, then crushed by a high-speed universal grinder, and finally passed through a 10-mesh sieve to collect the corn cob powder under the sieve;

[0062] Step 3. After mixing 1.67g of activated sludge powder and 8.33g of corn cob powder evenly, put it into a tubular electric furnace with nitrogen, set the nitrogen rate to 300mL / min, and the heating rate to 15°C / min. Pyrolysis at a pyrolysis temperature of 450° C. for 3 hours, and cooling to obtain the soil conditioner.

[0063] The mass ratio of activated sludge powder and corn cob powd...

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