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Biogas residue biological stability rapid test method and system

A technology of biological stability and testing method, which is applied in the field of quick testing of biological stability of biogas residues, can solve the problems of mold breeding test results, test timeliness defects, uneven gas-solid mass transfer, etc., so as to save test time and be highly repeatable property, and the effect of increasing the reaction rate

Active Publication Date: 2020-09-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aerobic respiration rate test usually requires a moisture content of about 50%. If the moisture content is too high, local anaerobia will easily occur. If the moisture content is too low, mold may grow on the surface of the material and affect the final test results.
The aerobic respiration rate is often suitable for the evaluation of the biological stability of compost products, and the moisture content of fresh biogas residues is usually greater than 80%. Oxygen problem, and additional inoculation of aerobic bacteria is required
Anaerobic methanogenesis potential (BMP) is another method used to measure the biodegradability of garbage, but its anaerobic methanogenesis potential requires more than 21 days, which makes the timeliness of the test have great defects

Method used

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  • Biogas residue biological stability rapid test method and system
  • Biogas residue biological stability rapid test method and system

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Experimental program
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Effect test

Embodiment 1

[0042] The rapid test device for the biological stability of biogas residues in this embodiment includes a culture bottle 1 , a lye absorption bottle 7 , a gas flow meter 8 , a relay 10 and a metering pump 4 , wherein the biogas residue sample 2 is filled in the culture bottle 1 . The lye absorption bottle 7 is connected with the culture bottle 1, and the nitrogen produced in the culture bottle 1 is according to figure 1 The nitrogen flow direction 6 in the flow flows to the lye absorption bottle 7. Gas flowmeter 8 is connected with described lye absorption bottle 7. The relay 10 is electrically connected with the gas flow meter 8 and receives the electrical signal sent by the gas flow meter 8 . The filling pump 4 is a metering pump, and its input end of the metering pump is connected to the KNO 3 The output end of the solution storage tank is connected to the culture bottle 1 , and the metering pump is electrically connected to the relay 10 . The metering pump is provided ...

Embodiment 2

[0046] Take the biogas residue produced in the catering waste batch anaerobic digestion reactor for 3 days, and record it as D3. Adjust the solid content of biogas residue to 5%, inject the biogas residue with adjusted solid content into culture bottle 1, and add 2mol / L KNO 3 solution into the culture bottle 1, so that the concentration of nitrate in the biogas residue is 250mg-N / L. After replacing the headspace of the culture bottle 1 with helium, the culture bottle 1 was placed in an incubator at 20° C. and 150 rpm for cultivation. The schematic diagram of the rapid evaluation biogas residue stability test system is as follows: figure 1 shown.

[0047]After 216 hours of cultivation, the corresponding nitrate removal efficiency of the D3 reactor was 55.8±0.4 mg-N / g-VS, (VS was calculated as the volatile solids of the initial biogas residue).

Embodiment 3

[0049] Take the biogas residue produced in the catering waste batch anaerobic digestion reactor on day 21 and day 43, and record it as D21. Adjust the solid content of biogas residue to 5%, inject the biogas residue with adjusted solid content into culture bottle 1, and add 2mol / L KNO 3 solution into the culture bottle 1, so that the concentration of nitrate in the biogas residue is 250mg-N / L. After replacing the headspace of the culture bottle 1 with helium, the culture bottle 1 was placed in an incubator at 20° C. and 150 rpm for cultivation. The schematic diagram of the rapid evaluation biogas residue stability test system is as follows: figure 1 shown. After 216 hours of cultivation, the corresponding nitrate removal efficiency of the D21 reactor was 53.9±0.1 mg-N / g-VS (VS was calculated as the volatile solids of the initial biogas residue).

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Abstract

The invention relates to a biogas residue biological stability rapid test method and system. The test steps are as follows: S1, collecting a biogas residue sample, adjusting the moisture content, andthen adding the sample into a culture bottle; S2, adding a KNO3 solution into the culture bottle, and starting reaction; S3, metering the amount of gas generated in the culture bottle, and when the amount of the generated gas reaches a preset threshold value, adding a KNO3 solution with a set value into the culture bottle; and S4, metering the adding amount of the KNO3 solution, and correspondingly performing calculating according to the adding amount of the KNO3 solution to obtain the quantified biogas residue biological stability. Compared with the prior art, the characteristic of high denitrification activity of biogas residues is utilized, exogenous inoculums do not need to be introduced, and the influence of the exogenous inoculums on the test accuracy is avoided; nitrate radicals areused as an electron acceptor, so that the reaction rate can be increased, and the test time is saved; and the biochemical reaction in the culture bottle is carried out in a homogeneous system, and the test result has higher repeatability.

Description

technical field [0001] The invention relates to the fields of environmental protection and comprehensive utilization of resources, in particular to a method and system for rapidly testing the biological stability of biogas residues. Background technique [0002] Organic waste such as kitchen waste is usually treated by anaerobic digestion process. Biostability refers to the degree to which a material can no longer be degraded by microorganisms in a specific environment and tends to be stable. Kitchen waste recycling products with high biological stability have higher fertilizer efficiency and lower risk of environmental pollution after being applied to soil. On the one hand, the biological stability of biogas residues is closely related to the operation status of anaerobic digestion reactors, and on the other hand, it is an important indicator of the subsequent land use of biogas residues. [0003] The biostability of biogas residues is essentially determined by the undegr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12Q1/02C12M1/34C12M1/24C12M1/107C12M1/00
CPCC12Q1/02C12M23/08C12M29/00C12M29/20C12M41/00C12Q2304/40
Inventor 彭伟何品晶吕凡邵立明章骅郝丽萍
Owner TONGJI UNIV
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