Method for promoting organic acid yield from sludge

An organic acid and sludge technology, which is applied in the field of increasing the output of organic acids in sludge production, can solve the problems of high investment and operating costs, application restrictions, etc., and achieve the effect of reducing resources, shortening time, and optimizing the sludge treatment system

Inactive Publication Date: 2007-12-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are several existing methods for increasing the hydrolysis rate of sludge: heat treatment, thermochemical treatment, mechanical treatment, ultrasonic treatment and enzyme treatment, etc. However, due to the high investment and operating costs, the application of these pretreatment methods is limited. very restrictive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In a reactor with a working volume of 5 liters made of plexiglass, add the remaining sludge (its water content is 99.2%, pH=6.76) produced by the traditional activated sludge method as the substrate for fermentation and acid production, and the reaction temperature is 21±1°C (the present invention is applicable to any conventional temperature, here only 21±1°C is taken as an example, the following examples are the same), through the action of microorganisms contained in the sludge itself, the sludge organic matter in the non-water dissolved state is converted into organic acids. The residence time of the sludge in the reactor is 3 days, and 62.43 milligrams of organic acid per liter (calculated by chemical oxygen demand) is produced.

Embodiment 2

[0028] In a reactor with a working volume of 5 liters made of plexiglass, add the remaining sludge (its water content is 99.2%, pH=6.76) produced by the traditional activated sludge method as the substrate for fermentation and acid production, and the reaction temperature is 21±1°C. Anionic surfactant sodium lauryl sulfate is added to the reactor, through the action of anionic surfactant and the microorganisms contained in the sludge itself, the sludge organic matter in a non-water-soluble state is converted into an organic acid. Wherein, the ratio of the amount of anionic surfactant to the dry weight of the sludge is 0.01:1, and the residence time of the sludge in the reactor is 5 hours. 48.23 milligrams per liter of organic acid (based on chemical oxygen demand) were obtained.

Embodiment 3

[0030] In a reactor with a working volume of 5 liters made of plexiglass, add the remaining sludge (its water content is 99.2%, pH=6.76) produced by the traditional activated sludge method as the substrate for fermentation and acid production, and the reaction temperature is 21±1°C. The pH value of the sludge in the reactor is adjusted to 8, and the non-water-soluble sludge organic matter is converted into an organic acid through the action of the alkaline pH value and the microorganisms contained in the sludge itself. The residence time of the sludge in the reactor was 5 hours. 71.42 milligrams per liter of organic acid (based on chemical oxygen demand) was obtained.

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Abstract

The invention belongs to envrionmental protection technique field, in detail relates to a method for increasing organic aicd output through adding anion surface active agent and controlling basic pH value. It takes primary sludge, excess sludge or mixture of them in wastewater treatment plant, converses organic matter in insoluble sludge to organic acid maximumly by adding anion surface active agent, controlling basic pH and employing bacteria function in said sludge. The ratio between consumption amount of anion surface active agent and sludge dry amount is 0.01: 1- 0.1- 1, the pH is controlled between 8 to 12 for bacteria action, the retention time of sludge in reactor is from 5 hours to 30 days. The invention increases organic acid output when makes full use of sludge and reduces environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a method for increasing the output of organic acids produced from sludge. Background technique [0002] Wastewater biological nitrogen and phosphorus removal process is an important means to prevent water eutrophication. In the process of microbial removal of nutrients such as nitrogen and phosphorus, they need a large amount of dissolved organic compounds as carbon sources, such as easily biodegradable organic compounds (such as methanol, acetic acid, etc.) are conducive to the denitrification process, and short-chain fatty acids ( Including acetic acid, propionic acid, etc.) are beneficial to the enhanced biological phosphorus removal by phosphorus accumulating bacteria. However, in most cases, the short-chain fatty acids in wastewater cannot meet the needs of microorganisms to remove nitrogen and phosphorus at the same time, especially the concentration of organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/40C02F11/02
Inventor 陈银广姜苏张礼平周琪顾国维
Owner TONGJI UNIV
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