Method for preparing organic fertilizer by dry-type high-temperature anaerobic fermentation of papermaking sludge

A technology of high-temperature anaerobic fermentation and papermaking sludge, which is applied to organic fertilizers, sewage/sludge fertilizers, sludge treatment, etc., to achieve good shape, reduce ammonia volatilization, and low energy consumption

Inactive Publication Date: 2011-12-14
ZHONGCHENG HONGTIAN BEIJING ENVIRONMENT TECH DEV
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing organic fertilizers using papermaking sludge as a raw material and using composite microbial degradation technology for dry-type high-temperature anaerobic fermentation, so as to solve the problems of energy saving and environmental protection in the resource development process of papermaking sludge

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  • Method for preparing organic fertilizer by dry-type high-temperature anaerobic fermentation of papermaking sludge
  • Method for preparing organic fertilizer by dry-type high-temperature anaerobic fermentation of papermaking sludge

Examples

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Embodiment 1

[0035] (1) Adjusting the water content of papermaking sludge to prepare mixed sludge

[0036] Papermaking sludge with a moisture content of 75-80% is used as raw material, and the papermaking sludge and regulator are mixed uniformly at a mass ratio of 2.5:2-3.0:2 ​​without standing still. The above mixture is sent to extrusion dehydration equipment through a conveyor to obtain mixed sludge with a moisture content of 50-55%, a carbon / nitrogen mass ratio (C / N) of 25:1-35:1, and an organic matter content of 60%-65%. .

[0037] (2) High temperature anaerobic fermentation reaction of mixed sludge in fermentation bin

[0038] The mixed sludge prepared in the step (1) enters the fermentation bin, and is fermented according to the mass ratio of the dry powder complex microbial flora to the mixed sludge of 1.5-2.0%. The mixed material reacts in the fermentation bin under the control of automatic temperature control and stirring equipment. The computer system controls the air supply i...

Embodiment 2

[0046] (1) Adjusting the water content of papermaking sludge to prepare mixed sludge

[0047] Papermaking sludge with a moisture content of 75-80% is used as raw material, and the papermaking sludge and regulator are mixed uniformly at a mass ratio of 2.5:2-3.0:2 ​​without standing still. The above mixture is sent to extrusion dehydration equipment through a conveyor to obtain mixed sludge with a moisture content of 50-55%, a carbon / nitrogen mass ratio (C / N) of 25:1-35:1, and an organic matter content of 60%-65%. . The energy of the press dewatering equipment for adjusting the water content of the paper sludge is provided by the biogas produced during the fermentation process.

[0048] Steps (2)-(5) are the same as in Example 1.

Embodiment 3

[0050] Step (1) is with embodiment 1.

[0051] (2) High temperature anaerobic fermentation reaction of mixed sludge in fermentation bin

[0052] The mixed sludge prepared in the step (1) enters the fermentation bin, and is fermented according to the mass ratio of the dry powder complex microbial flora to the mixed sludge of 1.5-2.0%. The mixed material reacts in the fermentation bin under the control of automatic temperature control and stirring equipment. The computer system controls the air supply in the early stage and cultivates aerobic microorganisms to make the papermaking sludge decompose, dehydrate and deodorize in a short time. The temperature control is automatically adjusted in the fermentation chamber. After 1 day, the temperature rises to 37°C, and the temperature is maintained at 37°C for 2 days. During this process, intermittent stirring is maintained every 3 hours, and the stirring time is 30 minutes each time. Then, after 1.5 days, the temperature rises to 50...

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Abstract

The invention discloses a method for preparing organic fertilizers by using composite microbial degradation technology dry-type high-temperature anaerobic fermentation with papermaking sludge as raw material, which specifically includes the following steps: (1) adjusting the water content of papermaking sludge to prepare mixed sludge; 2) The mixed sludge undergoes high-temperature anaerobic fermentation reaction in the fermentation bin, and the biogas generated by the reaction is recovered and purified through special system equipment; (3) After the anaerobic fermentation reaction, the material exits the fermentation bin for post-ripening and drying; (4) Post-fermentation post-ripening The product is crushed and sieved to obtain a powdery fermented material; (5) the powdered fermented material is mixed and granulated to prepare an organic fertilizer. The method for preparing the organic fertilizer of the invention improves the efficiency of the dry high-temperature anaerobic fermentation process in the economic benefit cycle, and has the effects of energy saving and environmental protection.

Description

technical field [0001] The invention relates to a method for preparing organic fertilizer by using industrial waste, in particular to a method for preparing organic fertilizer by using papermaking sludge as raw material and adopting composite microbial degradation technology for dry-type high-temperature anaerobic fermentation. Background technique [0002] The traditional sludge treatment methods in my country and even in the world mainly include water system dumping, incineration, landfill, land utilization, etc. The dumping of the water system pollutes the water body and destroys the ecological balance in the water; incineration consumes a lot of energy and investment, and the dust pollutes the air, which is not energy-saving, although the reduction is obvious; landfill pollutes the soil and groundwater; land use, although it is harmful to the soil Fertility helps, but its own heavy metal grayscale soil pollution, and parasites also affect the environment. [0003] The t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F7/00C02F11/04
CPCY02E50/343Y02A40/20Y02E50/30Y02W10/20Y02W30/40
Inventor 唐俊柏李楠闫大志孙晓奇
Owner ZHONGCHENG HONGTIAN BEIJING ENVIRONMENT TECH DEV
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