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Method for accelerating anaerobic propionic acid and butyric acid decomposition by utilizing ethanol and charcoal

A biochar, butyric acid technology, applied in chemical instruments and methods, anaerobic digestion treatment, biological water/sewage treatment, etc. The effect of low investment cost

Active Publication Date: 2017-06-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the effect received is not obvious
The reason has been attributed to the fact that acidifying bacteria that break down propionate and butyrate and transfer the resulting electrons directly to acetogenic methanogens, such as Geobacter, are less abundant in conventional anaerobic digestion units

Method used

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  • Method for accelerating anaerobic propionic acid and butyric acid decomposition by utilizing ethanol and charcoal
  • Method for accelerating anaerobic propionic acid and butyric acid decomposition by utilizing ethanol and charcoal

Examples

Experimental program
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Effect test

Embodiment 1

[0039] An upflow anaerobic digestion unit with an effective volume of 1L is inoculated with 400mL of anaerobic sludge, and the sludge concentration (MLSS) is 13g / L. The concentration of propionic acid in wastewater is 5137.5mgCOD / L. Analytical pure ethanol with a concentration ≥ 99.7% was added to the wastewater according to the COD ratio of 4:1, and the anaerobic digestion device was operated for 15 days. The pH in the anaerobic digestion unit is controlled at 7.2, and the temperature is controlled at 37°C. The hydraulic retention time of the anaerobic digestion unit is controlled at 12 hours. Weigh 5g of biochar (flaky, particle size 20-30mm) and add it to the biochar filling layer in the anaerobic digestion device, seal the anaerobic digestion device, and run the anaerobic digestion device for 15 days. Gradually reduce the amount of ethanol added in the wastewater, according to the COD ratio of ethanol and wastewater from 4:1 to 3:2, 2:3, 1:4, until the wastewater does no...

Embodiment 2

[0041] An upflow anaerobic digestion unit with an effective volume of 1L is inoculated with 400mL of anaerobic sludge, and the sludge concentration is 13g / L. The concentration of butyric acid in wastewater is 5137.5mgCOD / L. Analytical pure ethanol with a concentration ≥ 99.7% was added to the wastewater according to the COD ratio of 4:1, and the anaerobic digestion device was operated for 15 days. The pH in the anaerobic digestion unit is controlled at 7.2, and the temperature is controlled at 37°C. The hydraulic retention time of the anaerobic digestion unit is controlled at 12 hours. Take 5g of flake biochar with a particle size of 20-30mm and add it to the biochar filling layer in the anaerobic digestion device, seal the anaerobic digestion device, and run the anaerobic digestion device for 15 days. Gradually reduce the amount of ethanol added in the wastewater, and reduce the COD ratio of ethanol to wastewater from 4:1 to 3:2, 2:3, and 1:4 until there is no ethanol in th...

Embodiment 3

[0043] An upflow anaerobic digestion unit with an effective volume of 1L is inoculated with 350mL of anaerobic sludge, and the sludge concentration is 17g / L. The concentration of propionic acid in wastewater is 5031mgCOD / L. Analytical pure ethanol with a concentration ≥ 99.7% was added to the wastewater according to the COD ratio of 4:1, and the anaerobic digestion device was operated for 10 days. The pH in the anaerobic digestion unit is controlled at 7.2, and the temperature is controlled at 37°C. The hydraulic retention time of the anaerobic digestion unit is controlled at 6.7 hours. Take 10g of biochar (flaky, particle size 20-25mm) and add it to the biochar filling layer in the anaerobic digestion device, seal the anaerobic digestion device, and run the anaerobic digestion device for 10 days. Gradually reduce the amount of ethanol added in the wastewater, according to the COD ratio of ethanol to wastewater from 4:1 to 3:1, 2:1, until the wastewater does not contain etha...

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Abstract

The invention discloses a method for accelerating anaerobic propionic acid and butyric acid decomposition by utilizing ethanol and charcoal. The method comprises the following steps: adding ethanol into wastewater containing propionic acid or butyric acid according to a ratio 4:1 to 1:1 of chemical oxygen demand, and operating an anaerobic digestion device; controlling the hydraulic retention time of the device as well as the pH value and temperature in the device; adding charcoal into a charcoal filling layer in the device, and sealing the device; gradually reducing the addition amount of ethanol after the device is operated until the wastewater does not contain any ethanol, and monitoring the concentration of the propionic acid or butyric acid in the effluent of the device and methane yield in the device. According to the technical scheme, the method can achieve the technical effects that the decomposition rate of the anaerobic propionic acid or butyric acid is accelerated, a methane production acid balance is maintained, and the methane yield is improved. The technology is low in investment cost and simple to operate, and the effect is obviously improved. The method disclosed by the invention can be used for the anaerobic digestion device which is positioned in acidification state or in which methanation is inhibited, and can also be used for upgrading and rebuilding of the anaerobic digestion device for resisting high wastewater inlet load impact.

Description

technical field [0001] The invention relates to the field of environmental protection. Background technique [0002] Anaerobic methanation technology is currently one of the most realistic and effective methods to realize the energy conversion of pollutants. Anaerobic acid production and methanogenesis are quite different in terms of microbial ecology and metabolic speed, which can easily lead to an imbalance of methanation and stop. When anaerobic methanation fails, it often manifests as an increase in the concentration of propionic acid and butyric acid in the anaerobic digestion unit, which destroys the acid balance of anaerobic methanation, thereby inhibiting methane production. [0003] For half a century, the metabolism of anaerobic propionate and butyrate has been considered as a process in which acidifying bacteria exchange hydrogen electrons with methanogens, that is, interspecies hydrogen transfer—acidifying bacteria decompose propionate or butyrate to acetate and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F3/34C02F101/34
CPCC02F3/28C02F3/34C02F2101/34Y02E50/30
Inventor 张耀斌赵智强全燮李杨
Owner DALIAN UNIV OF TECH
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