Method for promoting sludge to produce organic acid utilizing surface active agent

A technology of surfactants and organic acids, applied in the direction of microorganism-based methods, biochemical equipment and methods, sludge treatment, etc., to achieve the effects of recycling polluted environment, optimizing sludge treatment system, and increasing hydrolysis rate

Active Publication Date: 2006-08-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no reports on the use of surfactants to promote acid production in sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In a reactor with a working volume of 5 liters made of plexiglass, add the remaining sludge (its water content is 99.4%, pH=6.84) produced by the traditional activated sludge process as a substrate for fermentation acid production, at room temperature , adding surfactant fatty alcohol polyoxyethylene ether carboxylate sodium, through the action of microorganisms contained in the sludge itself, the sludge organic matter in the non-water soluble state is converted into organic acid. Among them, the ratio of the amount of surfactant to the dry weight of the sludge is 0.15:1, the residence time of the sludge in the reactor is 3 days, and 180.76 mg / L of organic acid (calculated by chemical oxygen demand) is produced.

Embodiment 2

[0030]In a reactor with a working volume of 5 liters made of plexiglass, add the remaining sludge (its water content is 99.4%, pH=6.84) produced by the traditional activated sludge process as a substrate for fermentation acid production, at room temperature , add cationic surfactant tetradecyl dimethyl benzyl ammonium chloride to the reactor, through the action of the surfactant and the microorganisms contained in the sludge itself, the sludge organic matter in the non-water soluble state is converted into organic acid. Wherein, the ratio of the amount of surfactant to the dry weight of the sludge is 0.01:1, and the residence time of the sludge in the reactor is 3 days. 129.59 mg / L of organic acid (calculated by chemical oxygen demand) was obtained.

Embodiment 3

[0032] In a reactor with a working volume of 5 liters made of plexiglass, add the remaining sludge (its water content is 99.4%, pH=6.84) produced by the traditional activated sludge process as a substrate for fermentation acid production, at room temperature , add non-ionic surfactant Tween-80 into the reactor, the ratio of its dosage to the dry weight of the sludge is 0.1:1, and the residence time of the sludge in the reactor is 5 hours. 87.02 mg / L of organic acid (based on chemical oxygen demand) was obtained.

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Abstract

This invention relates to a method for promoting sludge to producing organic acid with a surface active agent, which takes the elementary deposition mud, residural sludge or their mixtures of a pollutant water process plant as the raw material to turn the undissolved sludge organics in the mud to organic acid acted by microbials in the mud, the ratio of the volume of the surface active agent and the dry sludge is 0.01: 1-0.3 : 1 and sludge stays for 5 hours ¿C 30 days in the reactor, which reduces volume of sludge and pollution to the environment and uses it as the resource.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for promoting the production of organic acids from sludge by using surfactants. Background technique [0002] In recent years, biological methods have been widely used in the treatment of urban sewage, but a large amount of sludge (including primary sludge and residual sludge) is produced in this process. According to a survey of 29 urban sludge treatment plants in China in 1996, the amount of sludge produced per 10,000 tons of wastewater is 0.3-3.0 tons (dry weight). In order to prevent secondary pollution, these sludges must be properly treated to stabilize them. [0003] Anaerobic digestion produces methane (CH 4 ) and other energy materials, and become a common method for sludge stabilization. Organic acids (especially short-chain fatty acids, including acetic acid, propionic acid, etc.) are very important intermediate products produce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/40C02F11/00C12R1/01
Inventor 陈银广姜苏周琪顾国维
Owner TONGJI UNIV
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