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A method for decomposing excess sludge and its application in hydrogen production by fermentation

A technology for excess sludge and sludge, which is applied in fermentation, sludge treatment, biological sludge treatment, etc., can solve the problems of difficult sludge reduction and resource utilization, difficult to achieve hydrogen production effect, etc., and achieve high-efficiency production Hydrogen, cost reduction effect

Active Publication Date: 2018-08-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If sludge is directly used as a substrate for hydrogen production, on the one hand it is difficult to achieve the desired hydrogen production effect, and on the other hand it is also difficult to achieve sludge reduction and resource utilization

Method used

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  • A method for decomposing excess sludge and its application in hydrogen production by fermentation
  • A method for decomposing excess sludge and its application in hydrogen production by fermentation
  • A method for decomposing excess sludge and its application in hydrogen production by fermentation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: The cracking effect of 10kGy dose irradiation and alkali coupling on excess sludge

[0024] Put 1L of excess sludge in a 1L brown grinding bottle, adjust the pH of the excess sludge to 12 with sodium hydroxide solution, and accept gamma-ray irradiation with a dose of 10kGy at room temperature. The radioactive source is 60 Co. After the irradiation, the pH of the remaining sludge was adjusted to neutral to obtain the decomposed sludge; various indicators in the decomposed sludge mixture were analyzed, and the decomposed effect of the sludge was shown in Table 1.

[0025] Table 1 The cracking effect of sludge under the condition of 10kGy and pH=12

[0026]

Embodiment 2

[0027] Example 2: The cracking effect of 20kGy dose irradiation and alkali coupling on excess sludge

[0028] Put 1L of excess sludge in a 1L brown grinding bottle, adjust the pH of the excess sludge to 12 with sodium hydroxide solution, and accept gamma-ray irradiation with a dose of 20kGy at room temperature. The radioactive source is 60 Co. After the irradiation, the pH of the remaining sludge was adjusted to neutral to obtain the decomposed sludge; various indicators in the decomposed sludge mixture were analyzed, and the decomposed effect of the sludge was shown in Table 2.

[0029] Table 2 The cracking effect of sludge under the condition of 20kGy and pH=12

[0030]

Embodiment 3

[0031] Example 3: The cracking effect of 30kGy dose irradiation and alkali coupling on excess sludge

[0032] Put 1L of excess sludge in a 1L brown grinding bottle, adjust the pH of the excess sludge to 12 with sodium hydroxide solution, and accept a dose of 30kGy of gamma-ray irradiation at room temperature. The radioactive source is 60 Co. After the irradiation, the pH of the remaining sludge was adjusted to neutral to obtain the decomposed sludge; various indicators in the decomposed sludge mixture were analyzed, and the decomposed effect of the sludge was shown in Table 3.

[0033] Table 3 Cracking effect of sludge under the condition of 30kGy, pH=12

[0034]

[0035] Analyzing the results of Examples 1-3, it can be found that under the condition of pH=12, different doses of irradiation have a certain degree of cracking effect on the remaining sludge, and the cracking effect of 10kGy is poor, and the cracking effect of 20kGy is the best. It can be seen that the treatm...

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Abstract

The invention specifically relates to a disintegration method for excess sludge and application of disintegrated sludge in hydrogen production through fermentation, belonging to the technical field of hydrogen production through biological fermentation. The disintegration method disintegrates the excess sludge through irradiation and alkali coupled treatment and comprises the following concrete steps: adjusting the pH value of the excess sludge to 10 to 12 by using an alkaline solution and carrying out Gamma ray irradiation at room temperature, wherein irradiation dose is 10 to 30 kGy and a radioactive source is 60 Co; and after completion of irradiation, adjusting the pH value of the excess sludge to 7 so as to obtain the disintegrated sludge. According to the invention, through irradiation and alkali coupled treatment, full release of organic components in the excess sludge is promoted; high-efficiency hydrogen production with the disintegrated sludge as a substrate is realized; a cheap and easily available substrate source is provided for the process of biological hydrogen production; and cost for hydrogen production through fermentation is reduced. Compared with the raw sludge, the concentration of soluble COD in a sludge disintegration liquid is increased by 28 to 37 times, the concentration of polysaccharide is increased by 25 to 29 times, and the concentration of protein is increased by 32 to 37 times.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by biological fermentation, and in particular relates to a method for cracking excess sludge and its application in hydrogen production by fermentation. Background technique [0002] With the increasing energy crisis and environmental pollution, human beings began to explore renewable clean energy to partially replace the fossil energy currently used in large quantities. Hydrogen has the characteristics of high combustion calorific value and clean combustion products, and is an ideal clean energy. [0003] At present, most of the hydrogen used in the industry is obtained by electrolysis of water and steam reforming of fossil fuels. These traditional hydrogen production methods have the characteristics of high energy consumption and high dependence on fossil fuels. In order to ensure the environmental benefits of hydrogen, hydrogen production by biological fermentation has attracted pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/04C12P3/00
Inventor 王建龙阴亚楠
Owner TSINGHUA UNIV
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