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Method for producing organic fertilizer from municipal sludge

A technology of municipal sludge and organic fertilizer, applied in the preparation of organic fertilizer, organic fertilizer, sewage/sludge fertilizer, etc., can solve the problems of affecting the quality of organic fertilizer and reducing the dehydration rate, and promote the process of aerobic composting of sludge. , Improve the blocking problem, improve the effect of microbial activity

Active Publication Date: 2019-11-01
济南中合环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the prior art, sludge and biomass auxiliary materials are mixed and dehydrated and then fermented to prepare organic fertilizers. However, due to the large difference in particle size between sludge and biomass auxiliary materials, they are mixed and then dehydrated, which reduces the dehydration rate and the moisture content is too high. There will be adverse effects when large materials are fermented, which will affect the quality of organic fertilizers

Method used

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  • Method for producing organic fertilizer from municipal sludge
  • Method for producing organic fertilizer from municipal sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: a kind of method utilizing municipal sludge to produce organic fertilizer:

[0025] S1: Dehydration of mixed materials:

[0026] First lay a layer of bio-based auxiliary material with a thickness of 20-30mm on the filter cloth, lay a layer of municipal sludge with a thickness of 10-20mm on the bio-based auxiliary material layer, and then lay a layer of 20-30mm on the municipal sludge layer. The thickness of the bio-based auxiliary material layer is carried out by the high-efficiency filter press dehydration method in the patent document CN103553294B for the pressing and dehydration process;

[0027] S2: Pre-fermentation process:

[0028] The process of pre-fermenting the mixed material after S1 dehydration into the buffer silo, the pre-fermentation temperature of the mixed material during the pre-fermentation is 25-35°C, and the pre-fermentation time is 22-26h;

[0029] S3: Fermentation process:

[0030] Loading the pre-fermented mixture of S2 into ferm...

Embodiment 2

[0040] Example 2: Characterization

[0041] Table 2 organic fertilizer performance test results

[0042]

[0043] From the experimental results in Table 2, it can be seen that water can dissolve organic matter in the process of microbial reproduction, promote its metabolism, and adjust the temperature of the heap by evaporating water. If there is too much moisture, the pores of the material in the pile are small, which will affect the exchange of oxygen with the outside world, resulting in an anaerobic environment and a foul smell; if the moisture content is too low, it will affect the growth and reproduction of microorganisms, and also delay the composting process. Composting results have a big impact.

[0044] If the particle size of the material is smaller, the specific surface area of ​​the reactor body is larger, and the reaction proceeds faster. However, if the particle size is too small, it will hinder the ventilation and oxygen supply of the stack. If the particl...

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Abstract

The invention provides a method for producing an organic fertilizer from municipal sludge. The method comprises the following steps: dehydrating a mixed material containing the municipal sludge and abio-based auxiliary material, and fermenting the materials. The step of mixing and dehydrating the municipal sludge and the bio-based auxiliary materials comprises the processes of laying the municipal sludge between two layers of bio-based auxiliary materials, laying the bio-based auxiliary materials sandwiched with the municipal sludge between two layers of filter cloth, and then carrying out filter pressing dehydration. The framework provided by the bio-based auxiliary materials is fully utilized, a hydrophobic channel is provided for the mixed materials, and water removal is better facilitated. After dehydration, the water content of the mixed material is reduced to 45-52%, and the synergistic effect is obvious. Furthermore, the bio-based auxiliary material effectively solves the problem that gaps of the filter cloth are blocked by municipal sludge, so that the use efficiency of the filter cloth is improved.

Description

technical field [0001] The invention belongs to the field of municipal sludge treatment, in particular to a method for producing organic fertilizer by utilizing municipal sludge. Background technique [0002] my country produces a large amount of municipal sludge every year. According to relevant reports, my country produces about 80 million tons of high-humidity sludge. Municipal sludge is extremely difficult to dewater. At present, after most sewage treatment plants are dewatered, the sludge moisture content is generally 80 ~85%, the humidity is high, resulting in high post-processing and disposal costs. Municipal sludge generally contains a certain amount of nutrients, but the organic matter is low, the carbon-nitrogen ratio is not suitable during aerobic fermentation, and the fermentation effect is poor. [0003] On the other hand, my country's light industry and chemical industry are developing rapidly. Products such as sugar and alcohol are extracted from plants, resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F15/00C05F17/00
CPCC05F5/006C05F17/00C05F7/00C05F11/00C05F11/08Y02W30/40
Inventor 辛寒晓闫永秀赵升远
Owner 济南中合环保科技有限公司
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