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Method for producing ethyl alcohol through anaerobic fermentation of excess sludge

A technology of anaerobic fermentation and excess sludge, applied in biological sludge treatment and other directions, can solve problems such as difficult operation and achieve the effect of resource utilization

Inactive Publication Date: 2019-05-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent obtains denitrification carbon sources mainly ethanol and acetic acid through ethanol-type fermentation of excess sludge, thereby improving denitrification efficiency, but this technology requires the cultivation of exclusive ethanol-type fermentation bacteria, and the thermal hydrolysis stage needs to control the reaction temperature Between 120 and 130 °C, the actual operation is more difficult; how to find a new technology for releasing carbon sources in sludge with high ethanol accumulation and relatively easy operation has become an urgent problem for scientific researchers to solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Dehydrate the remaining sludge from the sewage treatment plant to a solid concentration of 12%, add peanut shells at a rate of 7g of filler per 1kg of sludge, mix well and sterilize at 123°C and 0.14MPa for 30 minutes , and the sludge was naturally cooled to room temperature.

[0015] (2) Yeast activation: dissolve the yeast in 10 times distilled water, and place it in a constant temperature water bath shaker at 35°C for 10 minutes, and then transfer it to a constant temperature of 30°C for 15 minutes.

[0016] (3) Transfer all the activated yeast liquid to the sterilized sludge (measure the yeast liquid according to the ratio of the added mass of yeast to 1.5 / 1000 of the mass of fermented sludge), stir evenly, and adjust the fermentation mixing system pH value to 5.0; after sealing, place in a constant temperature water bath shaker at 32°C for anaerobic fermentation for 8 days; distill the fermentation mixture, and the concentration of ethanol in the distillate com...

Embodiment 2

[0018] Dehydrate the remaining sludge from the sewage treatment plant to a solid concentration of 20%, add corn stalks as a filler, add activated yeast liquid after high-temperature sterilization, adjust the pH value of the fermentation mixed system to 5.4, and keep the temperature at 36°C The anaerobic fermentation was carried out for 8 days under the same conditions, and the rest of the conditions were the same as in Example 1; the concentration of ethanol in the distillate component was 3530 mg / L.

Embodiment 3

[0020] Dehydrate the remaining sludge from the sewage treatment plant to a solid concentration of 30%, add bran at a rate of 10 g of filler per 1 kg of sludge, mix well and perform high-temperature sterilization; cool it naturally to room temperature, and put it into The activated yeast liquid was added, and the amount of yeast added was 3 / 1000 of the mass of the fermentation sludge; the pH value of the fermentation mixed system was adjusted to 5.4, and the anaerobic fermentation was carried out at a constant temperature of 34°C for 6 days; the other conditions were the same as those in the implementation Example 1 is the same; the concentration of ethanol in the distillate component is 4260 mg / L.

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PUM

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Abstract

The invention discloses a method for producing ethyl alcohol through anaerobic fermentation of excess sludge. The method comprises the steps that the excess sludge is dehydrated, and thus the mass percent concentration of solid matter in the sludge is 12-30%; then a plant filling agent is added, even mixing is conducted, and then high-temperature sterilization is conducted; the sterilized sludge is cooled to the room temperature, activated yeast liquid is added, the initial pH value of sludge anaerobic fermentation is 5.0-6.0, the fermentation time is 5-8 d, the reaction temperature is 32-42 DEG C, and after the sludge is subjected to anaerobic fermentation, a fermentation mixture is distilled to obtain the ethyl alcohol. According to the method, part of organic matter in the sludge is converted into low-molecular carbon source components such as the ethyl alcohol, and resource utilization of the sludge is achieved while the sludge is disposed.

Description

technical field [0001] The invention discloses a method for producing ethanol by anaerobic fermentation of excess sludge, and relates to the technical field of treatment, disposal and resource utilization of excess sludge in urban sewage treatment plants. Background technique [0002] With the improvement of my country's sewage treatment capacity, the surplus sludge output of urban sewage treatment plants is increasing day by day. Compared with the rapid growth of sludge production, the construction of sludge treatment and disposal facilities in my country is relatively lagging behind, and the phenomenon of random piles of sludge without treatment and disposal occurs from time to time, which has a serious impact on the surrounding ecological environment. [0003] In view of the relative shortage of carbon sources in the influent water of many urban sewage treatment plants in my country, the use of surplus sludge to develop internal carbon sources has attracted much attention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04
Inventor 刘树根吴孟杨虹朱南文
Owner KUNMING UNIV OF SCI & TECH