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Anaerobic digestion method based on self-sustaining air floatation screening

A technology of anaerobic digestion and air flotation, applied in microorganism-based methods, anaerobic digestion treatment, chemical instruments and methods, etc. The function of anaerobic digestion of oil to produce methane, avoid excessive dosing of materials at one time, and the effect of high degree of automation

Inactive Publication Date: 2020-10-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the emergence of the second-generation anaerobic reactor represented by the flow anaerobic sludge bed (UASB) and the third-generation anaerobic reactor represented by the expanded granular sludge bed (EGSB), the anaerobic treatment of sewage The organic loading (OLR) was increased to 50kgCOD(m 3 d) -1 Even 100kg COD(m 3 d) -1 As mentioned above, anaerobic technology has made great achievements in the field of sewage treatment, and anaerobic theory is relatively perfect day by day, but the progress of anaerobic technology in the field of organic solid waste is still slow
Due to its complex structure, organic solid waste has many technical difficulties in the anaerobic fermentation process, and the development of reactors for organic solid waste is relatively lagging behind

Method used

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Embodiment 1

[0035] An anaerobic digestion method based on self-sustained air flotation screening, the process flow chart is as follows figure 1 shown, including the following steps:

[0036] (1) Anaerobic digestion fiber pretreatment: anaerobic digestion fiber is pretreated with acetic acid at 90°C for 2 hours, and the liquid-solid ratio is 12mL / g; after the acetic acid pretreatment is completed, it is pretreated with ammonia water at 95°C for 1.5h, the pretreatment is complete After washing and drying;

[0037] (2) Prepare anaerobic fermentation strains: add anaerobic digestion sludge and fat-degrading bacteria to the basic medium as anaerobic fermentation strains; the anaerobic digestion sludge, fat-degrading bacteria and basic medium The mass ratio is 15:2:100;

[0038] (3) Mixing materials: the anaerobic digested fiber, municipal sludge and anaerobic fermentation bacteria that were pretreated in step (1) are mixed to obtain a mixture; the anaerobic digested fiber, municipal sludge a...

Embodiment 2

[0050] A kind of anaerobic digestion method based on self-sustaining air flotation screening, comprises the following steps:

[0051] (1) Anaerobic digestion fiber pretreatment: anaerobic digestion fiber is pretreated with acetic acid at 90°C for 2 hours, and the liquid-solid ratio is 12mL / g; after the acetic acid pretreatment is completed, it is pretreated with ammonia water at 95°C for 1.5h, the pretreatment is complete After washing and drying;

[0052] (2) Prepare anaerobic fermentation strains: add anaerobic digestion sludge and fat-degrading bacteria to the basic medium as anaerobic fermentation strains; the anaerobic digestion sludge, fat-degrading bacteria and basic medium The mass ratio is 20:1:100;

[0053] (3) Mixing materials: the anaerobic digested fiber, municipal sludge and anaerobic fermentation bacteria that were pretreated in step (1) are mixed to obtain a mixture; the anaerobic digested fiber, municipal sludge and anaerobic fermentation bacteria are mixed ...

Embodiment 3

[0065] A kind of anaerobic digestion method based on self-sustaining air flotation screening, comprises the following steps:

[0066] (1) Anaerobic digestion fiber pretreatment: anaerobic digestion fiber is pretreated with acetic acid at 90°C for 2 hours, and the liquid-solid ratio is 12mL / g; after the acetic acid pretreatment is completed, it is pretreated with ammonia water at 95°C for 1.5h, the pretreatment is complete After washing and drying;

[0067] (2) Prepare anaerobic fermentation strains: add anaerobic digestion sludge and fat-degrading bacteria to the basic medium as anaerobic fermentation strains; the anaerobic digestion sludge, fat-degrading bacteria and basic medium The mass ratio is 10:3:100;

[0068] (3) Mixing materials: the anaerobic digested fiber, municipal sludge and anaerobic fermentation bacteria that were pretreated in step (1) are mixed to obtain a mixture; the anaerobic digested fiber, municipal sludge and anaerobic fermentation bacteria are mixed ...

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Abstract

The invention discloses an anaerobic digestion method based on self-sustaining air floatation screening, andbelongs to the field of anaerobic fermentation. The method comprises the steps of anaerobicdigestion fiber pretreatment, anaerobic fermentation strain preparation, mixing, feeding, fermentation and air floatation screening. According to the anaerobic digestion method based on self-sustaining air floatation screening, by adding the step of self-sustaining air floatation screening, the effects of self-sustaining air floatation-screening-backflow of high-activity microorganisms and discharging of more difficult-to-degrade materials are achieved, the mass transfer effect can be enhanced, the reaction period is shortened, and the problem of insufficient degradation caused by material shortage in the anaerobic digestion process of organic solid waste is effectively avoided. Semi-continuous fermentation is adopted, the matrix conversion rate is increased, and the problem that a systemis unstable due to the fact that too many materials are added at a time and the load is too high and acidification is likely to happen to cause fermentation failure are solved.

Description

technical field [0001] The invention relates to the field of anaerobic fermentation, in particular to an anaerobic digestion method based on self-sustained air flotation screening. Background technique [0002] Biogas is mainly produced through microbial anaerobic digestion technology using organic matter such as urban domestic garbage, sewage sludge, animal manure, straw, and industrial organic waste. The main component of biogas produced is methane, which accounts for 40-60% of the total. %. The complete combustion of each cubic meter of biogas is equivalent to the heat generated by the combustion of 0.7kg of standard coal, so biogas is an important renewable biomass energy. [0003] The utilization methods of organic solid waste mainly include solidification molding, thermochemical conversion, anaerobic digestion and other technologies, among which the anaerobic digestion technology mainly uses anaerobic microorganisms to convert it into CH 4 , CO 2 or H 2 . CH 4 It...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F3/34C02F9/14C12N1/20C12R1/01
CPCC02F1/24C02F3/2893C02F3/34C02F2209/02C12N1/20
Inventor 戴晓虎华煜张悦李晓鸥
Owner TONGJI UNIV
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