Method and apparatuses for pretreating sewage plant excess sludge by microwave method and producing hydrogen by fermentation

A technology for excess sludge and pretreatment, applied in the direction of fermentation, etc., can solve the problems of increased production costs, low hydrogen purity, high manufacturing requirements, etc., and achieve the effects of cost savings, increased hydrogen purity, and low manufacturing costs

Inactive Publication Date: 2009-04-22
HUNAN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

This method has a long delay time (the period from the start of fermentation to hydrogen production), low purity of hydrogen, and large power consumption, high requirements for equipment manufacturing, and increased production costs

Method used

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  • Method and apparatuses for pretreating sewage plant excess sludge by microwave method and producing hydrogen by fermentation

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Effect test

Embodiment 1

[0035] Take 100ml of sludge from the secondary settling tank of urban sewage plant, the concentration of which is MLSS (mixed solid suspended solids) is 16.52g / L. Microwave pretreatment was performed for 2 minutes, and the power of the microwave reactor was 560W. To release the organic nutrients in the sludge, kill the methanogens and pathogenic bacteria at the same time, and release some heavy metals adsorbed in the sludge. After pretreatment, the nutrients in the sludge were released, and the protein content of the original sludge increased from 25.40mg / L to 410.52mg / L; the carbohydrate content increased from 18.72mg / L to 202.65mg / L; SCOD (Soluble COD) increased from 1520mg / L of the original sludge to 2840mg / L.

[0036]Then put the pretreated sludge in a serum bottle, add 5ml of hydrogen production seed sludge, control the temperature at 35°C, and blow nitrogen for 5 minutes to remove the oxygen in the air above the remaining sludge and maintain the anaerobic state of the f...

Embodiment 2

[0038] Take 1 liter of anaerobic granular sludge and heat it in a water bath at 80°C for 2 hours as a seed sludge for hydrogen production.

[0039] 10 liters of residual sludge from a sewage plant with an MLSS of 15.21g / L is pumped into the microwave reactor 2 through the raw sludge inlet 1 by the transfer pump 12, and the pretreatment is 10 minutes with a power of 800W. Then another delivery pump 12 continuously pumps the pretreated sludge into the fermentation hydrogen production reactor 5 through the sludge inlet 3 through the pipeline, adds 1 liter of hydrogen production seed sludge, and controls the temperature to 35°C through the heater. Turn on the agitator 6 to mix the hydrogen-producing seed mud and the sludge evenly. Hydrogen is produced after 12 hours, and the hydrogen is collected by the hydrogen collection device 7 through the hydrogen outlet 11. On average, every 10 liters of sludge can produce 1000-3000ml of hydrogen, the maximum hydrogen production rate is 10....

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Abstract

The invention discloses a method and a device for pretreating excess sludge of a sewage plant by a microwave method for fermentation to produce hydrogen. The method comprises the following steps: microwave is utilized to pretreat the excess sludge of the sewage plant for 2 to 20 minutes, then the sludge pretreated by the microwave is placed into a sealed fermentation hydrogen production reactor, hydrogen production seed sludge which accounts for 5 to 15 percent of the volume of the excess sludge is grafted, the temperature is controlled to between 25 and 45 DEG C for fermentation hydrogen production, and hydrogen is produced after 8 to 15 hours. The device comprises a microwave generator, the fermentation hydrogen production reactor and a hydrogen collection device, wherein the top of the fermentation hydrogen production reactor is provided with a hydrogen outlet, while the bottom is provided with a sludge inlet and a sludge discharge outlet; the microwave generator is connected with the sludge inlet of the fermentation hydrogen production reactor; the hydrogen collection device is connected with the hydrogen outlet of the fermentation hydrogen production reactor; and the fermentation hydrogen production reactor is provided with a stirrer and a heater. The method has the advantages that the method has large hydrogen yield and short delay time, can improve the biological redegradation capability of the sludge, can release heavy metals in the sludge, reduce the pollution of landfill treatment to soil, and has simple equipment, low cost and less energy consumption.

Description

technical field [0001] The invention belongs to a method for fermenting hydrogen production from residual sludge in a sewage plant, in particular to a method for pretreating sludge by microwave irradiation, adding hydrogen production seed sludge to ferment hydrogen production, and belongs to the reuse and recycling of solid waste in environmental protection. The field of clean energy production. The present invention also includes a device for implementing the above method. Background technique [0002] Due to the massive use of non-renewable resources such as coal and oil, human beings are not only facing the depletion of resources, but also pollute the environment and produce the greenhouse effect. In the future, fossil fuels will inevitably be replaced by non-polluting fuels. Hydrogen is a clean energy source that produces only water when burned, not greenhouse gases. Moreover, the heat generated by hydrogen combustion is 142.35KJ / g, which is 2.75 times that of hydroca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P3/00
Inventor 郭亮李小明曾光明杨麒谢波周屹廖德祥
Owner HUNAN UNIV
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