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Preparation method of biogas slurry cured organic fertilizer

A technology of organic fertilizer and biogas slurry, which is applied in the preparation of organic fertilizer, organic fertilizer, and bio-organic part treatment, etc., can solve the problem of high operating cost, achieve the effects of increasing fertilizer efficiency, reducing use, and reducing impact

Active Publication Date: 2015-06-03
QINGDAO TIANREN ENVIRONMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using 4 steps, the heat has been developed and used many times, the heat consumption per cubic feed is about 190 kWh, and the operating cost is extremely high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0012] A kind of preparation method of biogas slurry solidified organic fertilizer of the present invention comprises the following steps:

[0013] (1) Crush the crop stalks in a grinder to 1-5cm, and send them into the mixing tank.

[0014] (2) The biogas slurry is mixed with the straw by spraying on the top of the mixing tank for aerobic fermentation. Because the straw has good water absorption characteristics and has good porosity after water absorption, it is beneficial to the enrichment of nutrients in the subsequent aerobic fermentation process. The contact area between the straw and the biogas slurry can be enlarged by spraying, so that the straw can better absorb the biogas slurry, so as to achieve the purpose of absorbing the biogas slurry.

[0015] The process condition of carrying out aerobic fermentation in the described stirring tank is:

[0016] a. C / N: C / N is an important consideration parameter for raw material adjustment. The most suitable C / N control for ae...

Embodiment 1

[0027] A preparation method of biogas slurry-solidified organic fertilizer, specifically, crushing 6 tons of crop straw to 1-2 cm, and sending it into a mixing tank; spraying 1 ton of biogas slurry into the mixing tank at the top of the mixing tank to mix with the straw, Carry out aerobic fermentation, then send it to an aerobic fermentation tank for re-fermentation, maintain the humidity in the aerobic fermentation tank at 50%, add ammonium bicarbonate to make the carbon-nitrogen ratio 25:1, sufficient oxygen and phosphorus and potassium; then send it to granulation The granulation is carried out in the machine, and clay and animal manure are added into the granulator at the same time, the addition amount is 0.8% of the mass of the straw, and the finished product is made into a finished product through a conventional follow-up process for packaging.

[0028] After measurement, the fertilizer contains 60% organic matter (calculated on a dry basis), 10% of total nutrients (calcu...

Embodiment 2

[0031] A preparation method of biogas slurry-solidified organic fertilizer, specifically, crushing 8 tons of crop straw to 2-3 cm, and sending it into a mixing tank; spraying 1 ton of biogas slurry into the mixing tank at the top of the mixing tank to mix with the straw, Carry out aerobic fermentation, then send it to an aerobic fermentation tank for re-fermentation, maintain the humidity in the aerobic fermentation tank at 60%, add ammonium bicarbonate to make the carbon-nitrogen ratio 30:1, sufficient oxygen and phosphorus and potassium; then send it to granulation The granulation is carried out in the machine, and clay is added into the granulator at the same time, the addition amount is 1.2% of the mass of the straw, and the finished product is made into a finished product through a conventional follow-up process for packaging.

[0032] After measurement, the fertilizer contains 64% organic matter (calculated on an oven-dried basis), 14% of total nutrients (calculated on an...

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PUM

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Abstract

The invention provides a preparation method of a biogas slurry cured organic fertilizer. The preparation method comprises the following steps: crushing crop straws, mixing with biogas slurry in a stirring tank, then fermenting in an aerobic fermentation tank, then pelletizing in a pelletizer, carrying out conventional subsequent treatment process to obtain a finished product and packaging. By utilizing the method, nutritional elements of N, P, K and the like in the biogas slurry can be enriched to produce organic fertilizer, so that the fertilizer efficacy is increased and the influence of the biogas slurry emission on the environment can be reduced.

Description

technical field [0001] The invention relates to a method for preparing solid organic fertilizer by utilizing biogas slurry, which belongs to the field of fertilizer processing. technical background [0002] Biogas slurry is rich in nutrients, but most of it is water, which is difficult to use directly. Abroad, biogas slurry fertilizer is mainly concentrated through multi-effect evaporation as a commercial fertilizer. This technology mainly concentrates biogas slurry through low pressure or osmosis process. For example, a biogas project named Bioconstruct in Kaarssen, Germany processes 100,000 tons of cow dung and 30,000 tons of corn stalks every year. The project completed the biogas slurry concentrator in 2006. Through the vacuum evaporation process, the liquid is divided into 2 parts: clean water and concentrate. Because of the separation into multiple steps, vacuum evaporators (VE) can be performed at low temperatures. Under vacuum, evaporation can be achieved at 4...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05F17/00C05F15/00
CPCY02W30/40
Inventor 贾志莉
Owner QINGDAO TIANREN ENVIRONMENT