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Method for improving anaerobic digestion of waste oil and fat to produce methane through saponification pretreatment

An anaerobic digestion, waste oil technology, applied in waste fuel, fermentation and other directions, can solve the problems of reducing microorganisms, reducing the rate of methane production, sludge flotation and scouring, etc.

Pending Publication Date: 2021-03-19
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Waste oil is degraded into long-chain fatty acids after hydrolysis, and the enrichment of long-chain fatty acids is the main reason for inhibiting anaerobic digestion. transport of substances, followed by flotation and scouring of sludge, which will reduce the contact and utilization of microorganisms to substrates and ultimately affect methane production; and methanogens) have a toxic effect, which eventually leads to a decrease in the rate of methane production

Method used

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  • Method for improving anaerobic digestion of waste oil and fat to produce methane through saponification pretreatment
  • Method for improving anaerobic digestion of waste oil and fat to produce methane through saponification pretreatment
  • Method for improving anaerobic digestion of waste oil and fat to produce methane through saponification pretreatment

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Embodiment 1

[0029] The present embodiment provides a kind of preparation of calcium soap and the method for improving anaerobic methanogenesis of waste oil and fat, specifically comprise the following steps:

[0030] This example uses CaSO 4 As a source of calcium, Ca 2+ Three ratios with LCFAs, respectively 0.25, 0.5, 1 (mol / mol) to prepare calcium soap.

[0031] At room temperature, first add 5mL of sodium hydroxide solution (1mol / L) to a 100mL beaker, then add 5g of rapeseed oil to hydrolyze at 200rpm for 10min, and then add the corresponding amount of CaSO 4 , where Ca 2+ : LCFAs=1 This group added 5ml of ultrapure water (easy to stir), and finally sealed the mouth of the beaker with tinfoil, and stirred at 450rpm.

[0032] Take a small amount of generated samples at regular intervals and scan them with a Fourier transform infrared spectrometer (FTIR-HATR), until there are obvious characteristic peaks of calcium soap, stop stirring, and generate calcium soap. (a) type calcium soap...

Embodiment 2

[0036] The present embodiment provides a kind of preparation of calcium soap and the method for improving anaerobic methanogenesis of waste oil and fat, specifically comprise the following steps:

[0037] This embodiment adopts Ca(OH) 2 As a source of calcium, Ca 2+ Three ratios with LCFAs, respectively 0.25, 0.5, 1 (mol / mol) to prepare calcium soap.

[0038] At room temperature, first add 5mL of sodium hydroxide solution (1mol / L) to a 100mL beaker, then add 5g of rapeseed oil to hydrolyze at 200rpm for 10min, and then add the corresponding amount of Ca(OH) to the beaker 2 , and finally seal the mouth of the beaker with tinfoil, and stir with 450rpm rotating speed.

[0039] Take a small amount of generated samples at regular intervals and scan them with a Fourier transform infrared spectrometer (FTIR-HATR), until there are obvious characteristic peaks of calcium soap, stop stirring, and generate calcium soap. (b) type calcium soap spectrum as shown figure 1 (b) shown.

[...

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Abstract

The invention relates to a method for improving anaerobic digestion of waste oil and fat to produce methane through saponification pretreatment. The method comprises the following steps: carrying outsaponification reaction on waste oil and fat and calcium ions at room temperature under an alkaline condition in a calcium / oil molar ratio of 0.25-1, adding generated calcium soap into an anaerobic digestion reactor, adding an inoculum to enable the ratio of the calcium soap to the inoculum to be 0.5 (gVS / gVS), and carrying out anaerobic digestion under the conditions that the temperature is 35-37DEG C and the rotating speed is 150 rpm. Degradation of long-chain fatty acids in the oil and fat is promoted, and the methane yield is increased. Compared with the prior art, the method has the advantages that the methane production rate of the waste oil and fat is increased, the inhibition effect of long-chain fatty acids is relieved, the activity of anaerobic digestion for methane production 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 preparing calcium soap by saponification pretreatment to improve the methane production performance of waste oil anaerobic digestion Background technique [0002] With the global energy crisis and the increasing greenhouse effect, the search for clean, sustainable and renewable energy has attracted much attention. Under this trend, since waste oil has a high methane potential, which is 2.4 times higher than that of carbohydrates and 2 times higher than that of protein, the treatment of waste oil is also transferred from traditional landfill and incineration to organic waste. Anaerobic digestion technology for conversion to biogas. [0003] Anaerobic digestion is a promising technology for recovering bioenergy from biomass or biosolid waste, and it is one of the more effective waste oil treatment methods at present. This technology can...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 吴坤何霞郝家厚
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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