Method for improving sludge anaerobic fermentation and acid production

A sludge anaerobic fermentation and sludge technology, applied in the direction of fermentation, etc., can solve the problem of limited cell wall damage, achieve the effects of shortening the time of sludge anaerobic fermentation, increasing the rate of sludge hydrolysis, and improving efficiency

Inactive Publication Date: 2010-07-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkaline pretreatment, which has been studied more, can pro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] In a reactor made of plexiglass with a working volume of 1 liter, add the remaining sludge of the municipal sewage treatment plant (with a water content of 99.2%, pH=6.76) for anaerobic fermentation to produce acid, and the reaction temperature is 25±1℃ (The present invention is used for any conventional temperature, here only 25±1℃ is taken as an example, the following examples are the same), the ultrasonic energy density and the action time are respectively 1kw / L and 10min, and the residence time in the reactor is 8 hours. The volatile organic acid produced is 86.98 mg per liter (in terms of chemical oxygen demand).

Example Embodiment

[0026] Example 2

[0027] In a reactor made of plexiglass with a working volume of 1 liter, add the remaining sludge of the municipal sewage treatment plant (with a water content of 99.2%, pH=6.76) for anaerobic fermentation to produce acid, and the reaction temperature is 25±1℃ . The ultrasonic energy density and action time were 1kw / L and 10min, respectively, and the residence time in the reactor was 1 day. The produced volatile organic acid was 79.6 mg per liter (calculated by chemical oxygen demand).

Example Embodiment

[0028] Example 3

[0029] In a reactor made of plexiglass with a working volume of 1 liter, add the remaining sludge of the municipal sewage treatment plant (with a water content of 99.2%, pH=6.76) for anaerobic fermentation to produce acid, and the reaction temperature is 25±1℃ . The pH value was adjusted to 10, the residence time in the reactor was 4 days, and the volatile organic acid produced was 506 mg per liter (in terms of chemical oxygen demand).

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Abstract

The invention discloses a method for improving sludge anaerobic fermentation and acid production, belonging to the environmental protection technical field. The method is taken as follows: the residual sludge of municipal sewage plants are used as the raw material, wall breaking action is applied to the microorganisms in the sludge by control of the operating parameters of ultrasonic in order to ensure most of the organic substances in the cells of the microorganisms to be dissolved, lye is added to the sludge to regulate the pH value of the sludge, and the sludge is transformed furthest from the solid phase to the liquid phase and made to produce volatile organic matter under the action of the lye and the microorganisms. The invention further improves the quantity of the organic acid produced from the sludge on the basis of sludge innoxiousness and resource utilization.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a method for increasing acid production by anaerobic fermentation of sludge. Background technique [0002] The primary sludge and excess sludge produced in the sewage treatment process of urban sewage plants contain not only nutrients such as N, P, and K, and a large amount of organic matter, but also a certain amount of pathogenic microorganisms, heavy metals, and other harmful components. Improper disposal of sludge will cause environmental pollution and waste of resources. With the rapid development of my country's social economy and the continuous increase of urban population, the scale and number of urban sewage plants are constantly increasing. The amount of sludge produced in the sewage treatment process has also increased greatly, and the form of sludge treatment in my country is very severe. [0003] Among the numerous sludge treatment methods, anaerobic ...

Claims

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Application Information

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IPC IPC(8): C12P7/40
Inventor 严媛媛冯雷雨张超杰朱洪光周琪
Owner TONGJI UNIV
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