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Method for enhancing production of medium-chain fatty acid by anaerobic fermentation of residual sludge

A medium-chain fatty acid, anaerobic fermentation technology, applied in the field of environmental engineering by using magnetite to improve the production of medium-chain fatty acids from urban surplus activated sludge

Active Publication Date: 2021-10-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, VFAs are highly hydrophilic, and how to cost-effectively separate them from aqueous solutions remains a challenge.

Method used

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  • Method for enhancing production of medium-chain fatty acid by anaerobic fermentation of residual sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Schematic diagram of the reactor structure for anaerobic fermentation to produce medium-chain fatty acids figure 1 As shown, the effective volume is 500mL, the mixing method is mechanical stirring, and the temperature control mode is heating in a water bath. Add 200 g of pyrolysis sludge fermentation liquid into the reactor, and add 200 g of anaerobic digestion sludge;

[0029] (2) Add the ethanol of 240mM in the anaerobic reactor, add the sodium 2-bromoethylsulfonate (methane inhibitor) of 5g / L;

[0030] (3) Using 2M hydrochloric acid solution, the initial pH of the reactor was adjusted to 6.5;

[0031] (4) Add 5g / L, 200-mesh magnetite powder (the main component is ferroferric oxide) into the reactor, blow off the air in the reactor with nitrogen for 10min, and seal the air collecting bag to ensure the system strict anaerobic state;

[0032] (5) The fermentation reaction temperature is 35°C, the rotating speed of the mechanical stirring paddle is 150rpm / min, and...

Embodiment 2

[0035] (1) Add 200 g of pyrolysis sludge fermentation liquid to the anaerobic fermentation reactor, and add 200 g of anaerobic digestion sludge;

[0036] (2) Add the ethanol of 240mM in the anaerobic reactor, add the sodium 2-bromoethylsulfonate (methane inhibitor) of 5g / L;

[0037] (3) Using 2M hydrochloric acid solution, the initial pH of the reactor was adjusted to 6.5;

[0038] (4) Add 10g / L, 200-mesh magnetite powder (the main component is ferroferric oxide) into the reactor, blow off the air in the reactor with nitrogen for 10min, and seal the air collecting bag to ensure that the system strict anaerobic state;

[0039] (5) The fermentation reaction temperature is 35°C, the rotating speed of the mechanical stirring paddle is 150rpm / min, and the sequential batch feeding and discharging mode is adopted. After 20 days, the VFAs and MCFAs in the fermentation broth are determined by gas chromatography, wherein hexanoic acid is MCFAs The main component of COD, with a concent...

Embodiment 3

[0042] (1) Add 200 g of pyrolysis sludge fermentation liquid to the anaerobic fermentation reactor, and add 200 g of anaerobic digestion sludge;

[0043] (2) Add the ethanol of 240mM in the anaerobic reactor, add the sodium 2-bromoethylsulfonate (methane inhibitor) of 5g / L;

[0044] (3) Using 2M hydrochloric acid solution, the initial pH of the reactor was adjusted to 6.5;

[0045] (4) Add 20g / L, 200-mesh magnetite powder (the main component is ferroferric oxide) into the reactor, blow off the air in the reactor with nitrogen for 10min, and seal and connect the air bag to ensure the system strict anaerobic state;

[0046] (5) The fermentation reaction temperature is 35°C, the rotating speed of the mechanical stirring paddle is 150rpm / min, and the sequential batch feeding and discharging mode is adopted. After 20 days, the VFAs and MCFAs in the fermentation broth are determined by gas chromatography, wherein hexanoic acid is MCFAs The main component is 13.28g COD / L, accountin...

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Abstract

The invention relates to a method for increasing the production of the medium-chain fatty acid by the residual activated sludge through the magnetite, electron transfer in the anaerobic fermentation process is enhanced through the magnetite, the yield and component proportion of the medium-chain fatty acid in sludge fermentation liquid can be greatly increased, the capacity of producing the medium-chain fatty acid through anaerobic fermentation of the sludge is improved, and the method is an effective reinforcing means for sludge recycling.

Description

technical field [0001] The invention belongs to environmental engineering and relates to the technical field of water treatment, in particular to a method for using magnetite to promote urban residual activated sludge to produce medium-chain fatty acids. Background technique [0002] With the continuous growth of population and economy and the continuous deepening of various industrial revolutions, environmental pollution, resource and energy crises have become global problems faced by mankind. Especially in the process of sewage treatment, if a large amount of excess activated sludge is not properly treated and disposed of, it will pose a huge threat to the environment. However, surplus sludge is rich in organic carbon. According to statistics, my country's annual sludge output is expected to exceed 90 million tons in 2025. Facing such a huge amount of urban surplus sludge, if it is used as a resource, it will be a huge carbon source treasure trove. Sludge biological resou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/64C02F11/04C02F11/00
CPCC12P7/6409C02F11/04C02F11/00Y02E50/30
Inventor 文湘华陈湛朱诗惠孙晨翔田泽申黄霞
Owner TSINGHUA UNIV