Method for producing liquid compound fertilizer by using biogas slurry

Abstract

The invention provides a method for producing a liquid compound fertilizer by using biogas slurry. The method is characterized by comprising the following steps: a, screening and filtering biogas slurry, removing solid particles of which the grain sizes are greater than 0.25mm in the biogas slurry; b, adding a deodorant, a defoaming agent and humic substances to the biogas slurry, and then adjusting the pH of the biogas slurry to 5.5-8.5; measuring the content of kinds of nutrient elements in the biogas slurry; c, taking a part of biogas slurry in the step b and heating to 30-40 DEG C, adding a supplementary element to heated biogas slurry, and then stirring for dissolving; d, adding the heated biogas slurry to which the supplementary element is added in the step c to the biogas slurry which is not taken in the step b, diluting, mixing and stirring to an even state. The method has the beneficial effects that the required time and energy consumption for heating are reduced by adopting the technical scheme disclosed by the invention; the production efficiency is improved.

Description

technical field

[0001] The invention relates to a method for producing liquid compound fertilizer by utilizing biogas slurry. Background technique

[0002] In today's increasingly scarce energy, the use of biogas provides a solution to the energy crisis. Then large and medium-sized biogas projects will produce a large amount of biogas slurry after anaerobic fermentation of organic waste. The direct discharge of these biogas slurry into the environment will cause serious secondary pollution. Studies have shown that biogas slurry is a high-quality organic fertilizer rich in N, P, K and other elements essential for plant growth, but it is difficult to be widely used due to its nutrient imbalance and low fertilizer efficiency.

[0003] The existing method of using biogas to produce liquid compound fertilizer requires heating the biogas slurry to 70°C. Although the properties of the biogas slurry are relatively stable, the high energy consumption required for heating directly i...

Examples

Embodiment 1

[0036] Example 1 Preparation of a wide-adaptation flush-release fertilizer

[0037] The fertilizer formula is as shown in Table 1:

[0038] Table 1 Formula of wide-adapted flushing-release fertilizer

[0039] raw material weight percentage biogas slurry 45% Potassium humate 10% urea 30% superphosphate 20% potassium chloride 5%

[0040] Preparation of flush-release fertilizers recorded in the table above:

[0041] a. Use a vibration screening machine to screen and filter the biogas slurry to remove solid particles with a particle size greater than 0.25mm in the biogas slurry;

[0042] b. According to the ratio of 5kg citric acid and 2kg polypropylene glycol per ton of fertilizer, add citric acid as a flocculant and polypropylene glycol as a defoamer to the biogas slurry, and then use nitric acid to adjust the pH of the biogas slurry to 5.5-8.5; During the addition of flocculant and defoamer, conventional equipment is used to agit...

Embodiment 2

[0049] Example 2 A special foliar fertilizer for tomatoes

[0050] The fertilizer formula is shown in the table below:

[0051] Table 3 Formula table of special foliar fertilizer for tomato

[0052] raw material name weight percentage biogas slurry 90% urea 4% superphosphate 2% potassium chloride 1% Potassium humate 1% ferrous sulfate 0.5% magnesium sulfate 0.5% copper sulfate 0.2% Manganese sulfate 0.3% Zinc sulfate 0.2% Borax 0.3%

[0053] The preparation of the foliage fertilizer recorded in the table above:

[0054] a. Use a vibration screening machine to screen and filter the biogas slurry to remove solid particles with a particle size greater than 0.25mm in the biogas slurry;

[0055]b. According to the ratio of 5kg citric acid and 2kg polypropylene glycol per ton of fertilizer, add citric acid as a flocculant and polypropylene glycol as a defoamer to the biogas slurry, and then adjust th...

technical field

[0001] The invention relates to a method for producing liquid compound fertilizer by utilizing biogas slurry. Background technique

[0002] In today's increasingly scarce energy, the use of biogas provides a solution to the energy crisis. Then large and medium-sized biogas projects will produce a large amount of biogas slurry after anaerobic fermentation of organic waste. The direct discharge of these biogas slurry into the environment will cause serious secondary pollution. Studies have shown that biogas slurry is a high-quality organic fertilizer rich in N, P, K and other elements essential for plant growth, but it is difficult to be widely used due to its nutrient imbalance and low fertilizer efficiency.

[0003] The existing method of using biogas to produce liquid compound fertilizer requires heating the biogas slurry to 70°C. Although the properties of the biogas slurry are relatively stable, the high energy consumption required for heating directly i...

Examples

Embodiment 1

[0036] Example 1 Preparation of a wide-adaptation flush-release fertilizer

[0037] The fertilizer formula is as shown in Table 1:

[0038] Table 1 Formula of wide-adapted flushing-release fertilizer

[0039] raw material weight percentage biogas slurry 45% Potassium humate 10% urea 30% superphosphate 20% potassium chloride 5%

[0040] Preparation of flush-release fertilizers recorded in the table above:

[0041] a. Use a vibration screening machine to screen and filter the biogas slurry to remove solid particles with a particle size greater than 0.25mm in the biogas slurry;

[0042] b. According to the ratio of 5kg citric acid and 2kg polypropylene glycol per ton of fertilizer, add citric acid as a flocculant and polypropylene glycol as a defoamer to the biogas slurry, and then use nitric acid to adjust the pH of the biogas slurry to 5.5-8.5; During the addition of flocculant and defoamer, conventional equipment is used to agit...

Embodiment 2

[0049] Example 2 A special foliar fertilizer for tomatoes

[0050] The fertilizer formula is shown in the table below:

[0051] Table 3 Formula table of special foliar fertilizer for tomato

[0052] raw material name weight percentage biogas slurry 90% urea 4% superphosphate 2% potassium chloride 1% Potassium humate 1% ferrous sulfate 0.5% magnesium sulfate 0.5% copper sulfate 0.2% Manganese sulfate 0.3% Zinc sulfate 0.2% Borax 0.3%

[0053] The preparation of the foliage fertilizer recorded in the table above:

[0054] a. Use a vibration screening machine to screen and filter the biogas slurry to remove solid particles with a particle size greater than 0.25mm in the biogas slurry;

[0055]b. According to the ratio of 5kg citric acid and 2kg polypropylene glycol per ton of fertilizer, add citric acid as a flocculant and polypropylene glycol as a defoamer to the biogas slurry, and then adjust th...

Images