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Method for retarding inhibition of palmitic acid on anaerobic digestion methane production of waste grease

An anaerobic digestion, palmitic acid technology, applied in chemical instruments and methods, waste fuel, water treatment parameter control, etc., can solve the problems of reducing the rate of methane production, hindering the transfer of nutrients and electrons, and washing out sludge by flotation.

Inactive Publication Date: 2021-06-15
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There are also certain problems in the process of anaerobic digestion of waste oils and fats, in which the degradation of long-chain fatty acids is considered to be the rate-limiting step in the process of anaerobic digestion of waste oils and fats, because long-chain fatty acids are easily adsorbed to the cell surface and hinder nutrients And the transfer of electrons will also cause sludge flotation and be washed out of the reactor
Studies have found that long-chain fatty acids have toxic and inhibitory effects on different anaerobic digestion microorganisms (cooperative β-oxidizers and methanogens), which ultimately lead to a decrease in the rate of methane production

Method used

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  • Method for retarding inhibition of palmitic acid on anaerobic digestion methane production of waste grease

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Embodiment 1

[0021] The present embodiment provides a method for alleviating the inhibition of palmitic acid on methane production from anaerobic digestion of waste oil and fat, which specifically includes the following steps:

[0022] In this example, calcium palmitate was used as the reaction substrate, and three groups of anaerobic digestion flasks with a total volume of 150 mL were set up, and three parallel samples were set in each group, namely the calcium palmitate group. In the initial stage of the reaction, according to the ratio of substrate to inoculum of 1:1 (gVS / gVS), 20 mL of inoculated sludge was added to each group of anaerobic digestion flasks, and then the corresponding amount of calcium palmitate was added, respectively Nitrogen was passed through the anaerobic digestion bottle for 5 minutes, and the air was exhausted to maintain anaerobic conditions.

[0023] All anaerobic digestion flasks were subjected to anaerobic digestion at a temperature of 35-37 °C and a rotation...

Embodiment 2

[0025] The present embodiment provides a method for alleviating the inhibition of palmitic acid on methane production from anaerobic digestion of waste oil and fat, which specifically includes the following steps:

[0026] In this example, magnesium palmitate was used as the reaction substrate, and three groups of anaerobic digestion flasks with a total volume of 150 mL were set up, and three parallel samples were set in each group, namely the magnesium palmitate group. In the initial stage of the reaction, according to the ratio of substrate to inoculum of 1:1 (gVS / gVS), 20 mL of inoculated sludge was added to each group of anaerobic digestion flasks, and then the corresponding amount of magnesium palmitate was added, respectively Nitrogen was passed through the anaerobic digestion bottle for 5 minutes, and the air was exhausted to maintain anaerobic conditions.

[0027] All anaerobic digestion flasks were subjected to anaerobic digestion at a temperature of 35-37 °C and a ro...

Embodiment 3

[0029] The present embodiment provides a method for alleviating the inhibition of palmitic acid on methane production from anaerobic digestion of waste oil and fat, which specifically includes the following steps:

[0030] In this example, aluminum palmitate was used as the reaction substrate, and three groups of anaerobic digestion flasks with a total volume of 150 mL were set up, and three parallel samples were set in each group, namely the aluminum palmitate group. In the initial stage of the reaction, according to the ratio of substrate to inoculum of 1:1 (gVS / gVS), 20 mL of inoculated sludge was added to each group of anaerobic digestion flasks, and then the corresponding amount of aluminum palmitate was added, respectively Nitrogen was passed through the anaerobic digestion bottle for 5 minutes, and the air was exhausted to maintain anaerobic conditions.

[0031] All anaerobic digestion flasks were subjected to anaerobic digestion at a temperature of 35-37 °C and a rotat...

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Abstract

The invention relates to a method for retarding inhibition of palmitic acid on anaerobic digestion methane production of waste grease. The method specifically comprises the following steps: carrying out saponification reaction on palmitic acid and four metal ions (Ca<2+>, Mg<2+>, Al<3+> and Fe<3+>) to generate saponified matters, adding the generated saponified matters into an anaerobic digestion reactor, adding an inoculum to enable the ratio of the saponified matters to the inoculum to be 1(gVS / gVS), and performing anaerobic digestion under the conditions of the temperature of 35-37 DEG C and the rotation speed of 150 rpm. Therefore, such that the degradation of the long-chain fatty acid is promoted, the methane yield (92-124%) and the palmitic acid resource conversion rate (17.02-42.81%) are improved, and the calcium palmitate is particularly prominent. Compared with the prior art, the methane production rate of the waste grease is increased, the inhibition effect of long-chain fatty acid is relieved, the activity of anaerobic digestion methanogens is improved, and the method is easy to implement.

Description

technical field [0001] The invention belongs to the field of anaerobic digestion of organic waste, and in particular relates to a method for slowing the inhibition of palmitic acid on methane production from anaerobic digestion of waste oils and fats Background technique [0002] In recent years, the use of anaerobic digestion technology to treat organic waste and recover biomass energy has attracted more and more attention. Under this trend, since waste oil has high methane production potential, which is 2.4 times higher than carbohydrates and 2 times higher than protein, the treatment method of waste oil is also transferred from traditional treatment methods and biodiesel to anaerobic Digestive Technology. [0003] There are also certain problems in the anaerobic digestion process of waste oils and fats, in which the degradation of long-chain fatty acids is considered as the rate-limiting step in the process of anaerobic digestion of waste oils and fats, because long-chai...

Claims

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Application Information

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IPC IPC(8): C02F11/04C12P5/02C02F101/34
CPCC02F11/04C12P5/023C02F2209/28C02F2101/34Y02E50/30
Inventor 吴坤何霞
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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