Biogas slurry deep treatment method and application

A treatment method and technology for biogas slurry, applied in the field of deep treatment of biogas slurry, can solve problems such as environmental pollution, waste, and inability to reflect the value of nutrients, and achieve simple process flow, loose storage conditions, and flexible control of multi-effect evaporation. The effect of concentration multiples

Inactive Publication Date: 2015-09-30
南京元凯生物能源环保工程有限公司
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AI Technical Summary

Problems solved by technology

Even after pretreatment to remove most of the harmful components and solid particles in the biogas slurry, the value of nutrients cannot be reflected due to the existence of a large amount of free water in the biogas slurry
In addition, due to the seasonality of plant fertilization, in the season when fertilization is not required, the disorderly discharge of excess biogas slurry causes environmental pollution and waste

Method used

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  • Biogas slurry deep treatment method and application
  • Biogas slurry deep treatment method and application

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Embodiment Construction

[0023] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

[0024] The biogas slurry deep treatment method of the present invention is mainly through the three-stage membrane system and the multi-effect evaporation system S 4 To be done. Among them, the three-stage membrane system includes ultrafiltration S 1 , nanofiltration S 2 and reverse osmosis system S 3 . Among them, a transition pool is set behind each stage of the membrane system to temporarily store the clear liquid filtered by the membrane system, and each stage of the membrane system and the multi-effect evaporation system are also connected to concentrated water pools 1-4 respectively.

[0025] Such as figure 1 As shown, the method for preparing foliage fertilizer by biogas slurry deep treatment specifically includes the following steps:

[0026] (1) Ultrafiltration: The biogas slurry after pretreatment flows in the tube side o...

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Abstract

The invention discloses a biogas slurry deep treatment method. The method comprises the steps that pretreated biogas slurry is used as a raw material, and ultrafiltration, nanofiltration, reverse osmosis and multi-effect evaporation are performed in sequence; the membrane diameters of different membrane filtering systems are different, grade separation of different components in biogas slurry can be achieved, and then biogas slurry concentrated solutions obtained through different filtration ways can form leaf fertilizer of different grades. Meanwhile, the multi-effect evaporation technology and the membrane filtration technology are effectively combined, the disadvantage that the concentration multiple of the membrane separation technology is small is avoided, multi-effect evaporation is performed on the condition of the high temperature relative to the membrane, and biological bacteria in biogas slurry can be killed, so that the storage condition the final product is mild, and the problem that the product goes bad does not need to be considered. The biogas slurry deep treatment method has the advantages that the membrane separation technological process is simple and the fluid flow controllability is high, and further has the advantage that multi-effect evaporation can flexibly control the concentration multiple.

Description

technical field [0001] The invention belongs to the field of biogas slurry treatment, and in particular relates to a biogas slurry deep treatment method. 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 is a high-quality organic fertilizer. Such as figure 2 As shown, since the biogas slurry not only contains conventional nutrients required by plants such as crops and flowers, such as nitrogen, phosphorus, potassium, magnesium, calcium, etc., but also active organic components, such as humic acid, indole acetic acid, lactic acid bacteria, Plant hormones such as gibberellins and cytokinins, as well as organic molecules such as B vitamins, amino acids, proteolytic enzymes, and certain antibiotics. These components coordinate with each other and exist in the biogas slurry in the form of quick-acting nutrients and biopesticides, which can not onl...

Claims

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Application Information

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IPC IPC(8): C02F9/10C05F3/00C05F11/10
CPCY02A40/20
Inventor 杨蕴毅盛爱红李向花吴凯王超林秦岭
Owner 南京元凯生物能源环保工程有限公司
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