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Method for production of liquid fertilizer from biogas slurry

A liquid and biogas slurry technology, applied in liquid fertilizer, application, nitrogen fertilizer, etc., can solve the problems of high water content, high equipment cost, difficult processing, etc., and achieve high organic matter content, low continuous production, and low solid content. Effect

Inactive Publication Date: 2018-07-24
中节能绿碳(遵义)环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using biogas slurry as liquid fertilizer, the main problem at present is that there are many suspended solids and large particle size. If it is directly used as a liquid fertilizer raw material, it will cause nutrient flocculation and block irrigation equipment.
The existing technology uses graded sedimentation tanks, decanter centrifugal classifiers, plate-and-frame filter presses, etc. for solid-liquid separation. The graded sedimentation tanks can gradually separate suspended solids in the biogas slurry, and the cost is low, but the processing time is long and the floor area is large. Continuous production cannot be realized; although horizontal screw centrifugal classifiers and plate and frame filter presses can achieve continuous production and reduce the solid content of biogas slurry to less than 1%, the cost of equipment is high, and a large amount of additional filter aids and flocculants need to be added Such auxiliary materials not only affect the fertilizer efficiency of biogas slurry, but also produce a large amount of fine slag with high moisture content and difficult treatment
Moreover, the above-mentioned technology forces the separation of suspended solids rich in organic matter and beneficial microorganisms. After treatment, the nutrient content in the biogas slurry becomes lower, and the total nutrient content is generally lower than 1%, which greatly affects the fertilizer efficiency of the biogas slurry.

Method used

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  • Method for production of liquid fertilizer from biogas slurry
  • Method for production of liquid fertilizer from biogas slurry
  • Method for production of liquid fertilizer from biogas slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Utilize biogas slurry to produce humic acid-containing water-soluble fertilizer (balanced type), comprising the following steps:

[0029] The first step, pretreatment: use a sand mill to coarsely grind and emulsify the raw liquid of biogas slurry for 5 times;

[0030] The second step, one-time compounding: pump 300kg of biogas slurry that has been coarsely ground by a sand mill for 5 times into the blending reaction kettle through a diaphragm pump, add 60kg of fulvic humic acid at a speed of 150r / min, and add it after it is completely dissolved 195kg UAN solution (specific gravity 1.3g / L), then add 320kg ammonium polyphosphate solution (specific gravity 1.28g / L), and finally add 100kg potassium chloride, after completely dissolving, add biogas slurry stock solution that has been coarsely ground 5 times and set the volume to 1 ton ;Stir and emulsify at 20°C and 500r / min for 20min;

[0031] The third step is fine grinding: the semi-finished liquid fertilizer is ground fo...

Embodiment 2

[0037] Utilize the biogas slurry to produce the water-soluble fertilizer (high potassium type) containing humic acid, comprising the following steps:

[0038] The first step, pretreatment: use a sand mill to coarsely grind and emulsify the raw liquid of biogas slurry for 5 times;

[0039] The second step, one-time compounding: pump 300kg of biogas slurry that has been coarsely ground by a sand mill for 5 times into the blending reaction kettle through a diaphragm pump, add 60kg of fulvic humic acid at a speed of 150r / min, and add it after it is completely dissolved 234kg UAN solution (specific gravity 1.3g / L), then add 192kg ammonium polyphosphate solution (specific gravity 1.28g / L), and finally add 180kg potassium chloride, after completely dissolving, add biogas slurry stock solution that has been coarsely ground 5 times and set the volume to 1 ton ;Stir and emulsify at 30°C and 500r / min for 30min;

[0040] The third step is fine grinding: the semi-finished liquid fertilize...

Embodiment 3

[0046] The production of amino acid-containing water-soluble fertilizer from biogas slurry comprises the following steps:

[0047] The first step, pretreatment: use a sand mill to coarsely grind and emulsify the raw liquid of biogas slurry for 5 times;

[0048] The second step, one-time compounding: pump 300kg of biogas slurry that has been coarsely ground by a sand mill for 5 times into the blending reaction kettle through a diaphragm pump, add 300kg of amino acid raw powder at a speed of 150r / min, and add 160kg after it is completely dissolved Chelate trace elements (the mass percentages of each element are as follows: Fe4%, Mn2%, Zn5%, B2%), after completely dissolving, add biogas slurry stock solution that has been coarsely ground 5 times and set the volume to 1 ton; at 30°C, 500r / Stir and emulsify for 20 minutes at 1 min;

[0049] The third step is fine grinding: the semi-finished liquid fertilizer is ground for a second time through a colloid mill, and then put into a ...

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Abstract

The invention provides a method for production of a liquid fertilizer from biogas slurry. The method includes: pretreatment: subjecting stock biogas slurry to rough grinding and emulsification; primary compounding: according to the variety of the to-be-prepared liquid fertilizer, adding the pretreated stock biogas slurry into a blending reaction kettle and performing stirring, adding an auxiliarymaterial of certain ratio to a constant volume, then conducting constant temperature stirring emulsification to obtain a semi-finished product liquid fertilizer; fine grinding: carrying out secondarygrinding, filter pressing and third grinding on the semi-finished product liquid fertilizer in order; secondary compounding: putting the semi-finished product liquid fertilizer subjected to fine grinding in a stirring reaction kettle, adding an assistant of certain ratio and adjusting the PH value to 5.5-8.5, and then stirring the substances evenly; and filter pressing, metering, and packaging. The method provided by the invention adopts a multiple grinding way for refining treatment of suspended matters in the biogas slurry, not only keeps the macromolecular organic nutrients in the biogas slurry, but also improves the organic matter content of the biogas slurry raw material, the organic matter content is up to 4%, and the fertilizer efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of liquid fertilizer production, in particular to a method for producing liquid fertilizer by utilizing biogas slurry. Background technique [0002] Biogas slurry is the residue produced by anaerobic fermentation of organic waste such as human and animal manure and crop straw in a biogas digester. It contains nitrogen, phosphorus, potassium, magnesium and calcium and other elements needed for plant growth, rich in amino acids and various growth factors. hormones, vitamins, etc. Scientific application of biogas slurry will increase the content of organic matter and nutrient elements in the soil, improve soil structure, and increase soil fertility. Using biogas slurry as liquid fertilizer, the main problem at present is that there are many suspended solids and large particle size. If it is directly used as a liquid fertilizer raw material, it will cause nutrient flocculation and block irrigation equipment. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05B7/00C05C11/00C05G3/00C05G5/20C05G5/27C05D1/02C05D9/02C05F9/04C05F11/02
Inventor 车艳丽张慧敏邹登相
Owner 中节能绿碳(遵义)环保有限公司
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