A method for improving the efficiency of anaerobic digestion of organic wastewater and its application

An anaerobic digestion and organic wastewater technology, applied in anaerobic digestion treatment, chemical instruments and methods, waste fuels, etc., can solve the problems of long domestication time, heavy preparation work, and inability to economically and effectively increase the degradation rate of propionic acid. Achieve the effects of increasing the rate of methane production, promoting absorption, improving economy and effectiveness

Active Publication Date: 2022-06-24
HENAN AGRICULTURAL UNIVERSITY
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Problems solved by technology

[0003] Although there have been reports on the technology of improving the activity of hydrogen and acetic acid in the anaerobic digestion system, the bacteria to be added need to be purchased or cultivated with special anaerobic equipment, or conductive materials should be added to domesticate the anaerobic sludge
These measures require a lot of preparatory work and a long time for acclimatization. When the anaerobic digestion system is acidified, it cannot economically and effectively increase the degradation rate of propionic acid.

Method used

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  • A method for improving the efficiency of anaerobic digestion of organic wastewater and its application
  • A method for improving the efficiency of anaerobic digestion of organic wastewater and its application
  • A method for improving the efficiency of anaerobic digestion of organic wastewater and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The inoculum is the anaerobic activated sludge taken from the UASB reactor with an organic load of 5kg / (m 3 ·d), the daily volume gas production rate is 2.1L / (L·d).

[0038] The formula of propionic acid anaerobic medium is as follows: 1L deionized water is added with 2g sodium propionate, NaHCO 3 4g, Na 2 HPO 4 ·2H 2 O 530mg, KH 2 PO 4 410mg, NH 4 Cl 300mg, CaCl 2 ·2H 2 O 110mg, MgCl 2 ·6H 2 O 100mg, NaCl 300mg, FeCl 2 ·4H 2 O 4.5mg, EDTA·Na 2 1.65mg, trace element liquid 1mL, vitamin liquid 1mL.

[0039] Trace element liquid formula (mg / L): H 3 BO 4 50, ZnCl 2 50, CuCl 2 ·H 2 O 38, MnCl 2 ·4H 2 O 50, CoCl 2 ·6H 2 O 50, NiCl 2 ·6H 2 O 92, Na 2 SeO 3 ·5H 2 O 26, Na 2 WO 4 ·2H 2 O 33, Na 2 MoO 4 ·2H 2 O 24.

[0040] Vitamin liquid formula (mg / L): biotin 4, niacin 40, vitamin B6 10, vitamin B2 20, vitamin B140, vitamin B12 20, folic acid 20, lipoic acid 40, para-aminobenzoic acid 20.

[0041] The preparation method of propionic acid...

Embodiment 2

[0048] The difference between this example and Example 1 is that the anaerobic activated sludge is directly inoculated into the anaerobic digestion system without enrichment culture.

[0049] According to the steps in Example 1, construct the same anaerobic digestion system, inoculate 7 mL of sludge without enrichment culture, and culture according to the steps in Example 1. Gas production, gas composition and VFAs composition were measured every two days. The above 6 groups were carried out 3 parallel experiments. Compared with the anaerobic digestion system without adding dodecyl dimethyl betaine, the anaerobic digestion system adding 1, 5, 10 and 50 mg / L dodecyl dimethyl betaine, the maximum methane production rate respectively Improved by 51.36%, 47.68%, 46.88% and 86.59%.

Embodiment 3

[0051] The difference between this example and Example 1 is that dodecyl dimethyl betaine is directly added to the influent of the anaerobic digestion reactor.

[0052] Two UASB reactors with an effective volume of 4L were selected, and the influent water was diluted with waste molasses to a COD of 8000mg / L, and baking soda was added to adjust the alkalinity to 3000mg / L (with CaCO 3 The seed sludge is the anaerobic activated sludge taken from the UASB reactor in Example 1, and the inoculum volume is 1L.

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Abstract

The invention provides a method for improving the efficiency of anaerobic digestion of organic wastewater and an application thereof, belonging to the technical field of anaerobic digestion of organic wastewater. The present invention greatly improves the activity of hydrogen-producing acetogenic bacteria and methanogenic bacteria in the anaerobic digestion system by adding dodecyl dimethyl betaine to the organic wastewater anaerobic digestion system, thereby increasing the activity of propionic acid and acetic acid Degradation rate, which helps the anaerobic digestion system to recover from acidification, and increases the rate of methane production in anaerobic digestion.

Description

technical field [0001] The invention belongs to the technical field of anaerobic digestion of organic waste water, and in particular relates to a method for improving the efficiency of anaerobic digestion of organic waste water and its application. Background technique [0002] With the advancement of industrialization and urbanization, energy crisis and environmental pollution have become major problems facing our country. Anaerobic digestion of organic wastewater can not only remove pollutants economically and efficiently, but also recover renewable energy such as hydrogen and methane, so it has received extensive attention and applications. The complex organic matter generates methane and carbon dioxide after the combined action of hydrolyzed and fermented bacteria, hydrogen-producing acetogenic bacteria and methanogenic bacteria. Different groups of microorganisms cooperate and restrict each other. The stable progress of the anaerobic digestion process is the result of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C12P5/02
CPCC02F3/28C12P5/023C02F2305/04C02F2305/06C02F2209/08Y02E50/30
Inventor 张玉鹏刘凤琴刘红恩卢凯歌李畅袁志良陈云
Owner HENAN AGRICULTURAL UNIVERSITY
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