Method for preparation of organic fertilizer from organic solid waste

A technology of organic solids and organic fertilizers, applied to the preparation of organic fertilizers, organic fertilizers, biochemical equipment and methods, etc., can solve the problems of poor dehydration performance of mud cakes, long hydraulic retention time, and insufficient killing of pathogenic bacteria, and achieve effective results Good, more mature compost, and improved processing capacity

Inactive Publication Date: 2017-03-22
JIANGSU UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the disadvantages of traditional organic solid waste preparation process such as low solid content, long hydraulic retention time, large digester volume, poor dehydration performance of mud cake after digestion, insufficient pathogenic bacteria killing, etc., and provide a A kind of method that organic solid waste prepares organic fertilizer

Method used

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  • Method for preparation of organic fertilizer from organic solid waste

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Effect test

Embodiment 1

[0036] Dewatered sludge with a moisture content of 97.5% in urban sewage treatment plants is sent to the preheating heat exchanger, and the steam from the buffer heat exchanger preheats the sludge to a temperature of 90°C; then it is intermittently and quantitatively sent to the thermal hydrolysis tank Inside, the sludge in the thermal hydrolysis tank is treated with steam at a temperature of 190°C and a pressure of 1.0Mpa at multiple points, and the temperature in the tank is 170°C and the pressure is 0.6Mpa for thermal hydrolysis treatment for 30 minutes; The treated sludge has a solid content of 15%. After thermal hydrolysis, the material enters the buffer heat exchanger to flash and release preheated steam, so that the sludge temperature drops to 55°C and then enters the anaerobic reactor. The anaerobic reactor adopts buffer The heat source of the heat exchanger is kept warm, and the anaerobic reactor is pumped into the anaerobic reactor under the double action of the agita...

Embodiment 2

[0038] Dewatered sludge with a water content of 97.5% and kitchen waste with a water content of 85% in urban sewage treatment plants are blended into 88% mixed organic waste (that is, the solid content is 12%), which is transported to the buffer heat exchanger, and the waste heat steam After the mixture is preheated, the temperature is 80°C; then it is intermittently and quantitatively transported to the thermal hydrolysis tank, and the sludge in the thermal hydrolysis tank is fed with steam at a temperature of 190°C and a pressure of 1.0Mpa at multiple points, the tank The internal temperature is 170°C, the pressure is 0.6Mpa, and the thermal hydrolysis treatment is carried out for 50 minutes; the solid content of the sludge after thermal hydrolysis treatment is 25%. After thermal hydrolysis, the material enters the buffer heat exchanger to flash and release preheated steam. The sludge temperature is lowered to 55°C and then enters the anaerobic reactor. The anaerobic reactor ...

Embodiment 3

[0040]Dewatered sludge with a water content of 97.5% and chicken manure with a water content of 75% in urban sewage treatment plants are blended into 80% mixed organic waste (that is, the solid content is 20%), which is transported to the buffer heat exchanger, and the waste heat steam will After the mixture is preheated, the temperature is 90°C; then it is intermittently and quantitatively transported to the thermal hydrolysis tank, and the sludge in the thermal hydrolysis tank is fed with steam at a temperature of 190°C and a pressure of 1.0Mpa at multiple points. The temperature is 170°C, the pressure is 0.6Mpa, and the thermal hydrolysis treatment is carried out for 40 minutes; the solid content of the sludge after thermal hydrolysis treatment is 25%. After thermal hydrolysis, the material enters the buffer heat exchanger to flash to release preheated steam, so that the After the mud temperature drops to 55°C, it enters the anaerobic reactor. The anaerobic reactor adopts th...

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Abstract

The invention discloses a method for preparation of an organic fertilizer from organic solid waste. The method includes: preheating an organic solid waste mixture with a solid content of 2.5-20% by a preheating reactor, then using hot steam with a pressure of 0.6MPa and at a temperature of 155-170DEG C to conduct thermal hydrolysis and digestion, making the treated material enter a fluidized anaerobic reactor by a buffer heat exchanger to carry out anaerobic digestion biogas production reaction, applying the produced biogas to a front-end heating link, sending a mixture obtained by anaerobic reaction to a screw type dehydrator and conducting steam drying and dehydration, adding a proper conditioning agent into a filter cake, then sending the mixture to a composting system to carry out aerobic composting treatment, thus finally obtaining the organic fertilizer. Compared with the traditional method of preparing organic fertilizer from organic solid waste, the method provided by the invention has the characteristics of high degree of automation, short biogas production time and high efficiency, achieves cyclic utilization of heat energy, greatly reduces the dosage of the conditioning agent, and has better effect.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method for preparing organic fertilizer from organic solid waste. Background technique [0002] In recent years, my country's economy has developed rapidly, people's living standards have been improving day by day, higher requirements have been placed on the environment, and the efficiency of sewage treatment has been gradually improved. The residual sludge of urban sewage treatment plants is rich in organic matter, nitrogen, phosphorus and other nutrients, and has considerable fertilizer effects. [0003] With the improvement of living standards, the amount of kitchen waste is also increasing day by day. How to treat kitchen waste in a harmless and resourceful manner and realize the effective recycling of kitchen waste has great significance for my country's economic and environmental development. [0004] Anaerobic digestion and aerobic composting of organic so...

Claims

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Application Information

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IPC IPC(8): C05F7/00C05F15/00C05F17/00C12M1/107C02F11/04
CPCC02F11/04C05F3/00C05F7/00C05F17/50C12M1/107C05F11/00C05F9/00Y02A40/20Y02E50/30Y02P20/129Y02W30/40
Inventor 庄苍伟孔峰张晓叶程洁红马闪闪
Owner JIANGSU UNIV OF TECH
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