Method for supplementing denitrifying carbon source by utilizing excess sludge ethanol-type fermentation

A denitrification carbon source and excess sludge technology, applied in biological sludge treatment, pyrolysis treatment sludge, anaerobic digestion treatment, etc., can solve the problems of increased operating costs, toxic and side effects of denitrification system, and insufficient denitrification carbon source To avoid the accumulation of phosphorus in the system and improve the denitrification efficiency

Inactive Publication Date: 2010-11-10

长春联创水质工程有限公司

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Problems solved by technology

However, at present, my country's urban sewage BOD 5 The average level is low, and the problem of insufficient denitrification carbon source is common, which greatly limits the stable and effective function of sewage plants with biological denitrification function

[0003] Aiming at the problem of insufficient carbon sources for denitrification, early research mainly focused on adding low-molecular-weight organic substances such as methanol and ethanol to the denitrification section. This additional carbon source can increase the denitrification rate, but it is expensive

In recent years, research on external carbon sources has mainly focused on the use of industrial wastewater or landfill leachate as a carbon source for denitrification, which can not only achieve an economical way of adding additional carbon sources, but also solve the treatment proble...

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Abstract

The invention discloses a method for supplementing a denitrifying carbon source by utilizing excess sludge ethanol-type fermentation, which aims at the problems of low average level of the biochemical oxygen demand 5 (BOD5) of municipal sewage in China and ubiquitous shortage of the denitrifying carbon source. The method comprises the following steps of: allowing the excess sludge which is subjected to pyrohydrolysis pretreatment to enter a fermentation reactor; cultivating and domesticating ethanol-type zymophyte by using the sludge as a matrix; controlling the fermentation reaction to be atan ethanol-type fermentation stage; refluxing the products to a pyrohydrolysis stage; controlling the pyrohydrolysis temperature to be between 120 and 130 DEG C so that substances with boiling pointslower than 120 DEG C, such as ethanol, acetic acid and the like, exist in the form of gas; and collecting a high-quality organic carbon source which mainly comprises ethanol and acetic acid in a condensation reclaiming mode. The method has the advantages that: the denitrifying carbon source which mainly comprises the ethanol and the acetic acid effectively improves the denitrification efficiency,and the problem of phosphorus accumulation of a system caused by that the sludge after anaerobic digestion is directly used as an additional carbon source is avoided due to a special carbon source extraction mode; and the method also has the advantages of simple control condition of the whole process, easy operation and low operational cost.

Application Domain

Sludge treatment by pyrolysisTreatment with anaerobic digestion processes +1

Technology Topic

Municipal sewageChemistry +13

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Experimental program(1)

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[0020] Combine figure 1 The specific embodiments of the present invention are as follows:

[0021] Use simple liquid carbon source as the substrate to cultivate ethanol-type fermentation bacteria, and add the cultured ethanol-type fermentation bacteria to the fermentation reactor (2) as inoculation sludge, and control various parameters (pH, alkalinity, temperature, Oxidation-reduction potential, etc.) control the fermentation reactor (2) in the ethanol-type fermentation stage. After the operation is stable, the residual sludge product after the pretreatment of the thermal hydrolysis reactor (1) gradually replaces the simple liquid phase substrate, which is effective for ethanol-type fermentation. The bacteria are domesticated, and the fermentation reactor (2) is controlled in the ethanol fermentation stage with sludge as the substrate. The remaining part of the fermentation product is discharged through the sludge discharge pipe (6), and the other part is returned to the hot water through the return pipe (3) Decompose the reactor (1), and adjust the temperature between 120°C and 130°C, so that ethanol, acetic acid and other substances with boiling points below 120°C exist in gaseous form, and finally recover this part of the product through the condensation recovery device (4). The carbon source collection tank (5), the recovered high-quality organic carbon source is supplemented according to the lack of denitrification carbon source in the sewage plant.

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Classification and recommendation of technical efficacy words

Improve denitrification efficiency

Low-temperature water-resistant and sulfur-resistant denitration catalyst as well as preparation method and application thereof

InactiveCN107511158AReduced reduction in specific surface areaImprove denitrification efficiencyGas treatmentPhysical/chemical process catalystsSolventOxalate

Owner:FUDAN UNIV

Method for supplementing denitrifying carbon source by utilizing excess sludge ethanol-type fermentation

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Example Embodiment

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Description & Claims & Application Information

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