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Device and process for strengthening two-phase anaerobic digestion by utilizing Fenton iron sludge and iron-containing biochar

An anaerobic digestion and biochar technology, applied in the field of solid waste recycling, can solve the problems of slow mutual trophic metabolism, low efficiency of hydrolysis and acidification in the former phase, acid-producing bacteria and methanogens in the latter phase, etc., and achieves excellent promotion effect. , the effect of increasing redox and improving biocompatibility

Active Publication Date: 2022-05-27
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is to solve the problem of low efficiency of hydrolysis and acidification in the front phase of the two-phase anaerobic process and slow mutual support metabolic rate of acid-producing bacteria and methanogenic bacteria in the latter phase, and proposes A device and process for strengthening two-phase anaerobic digestion using Fenton iron slime and iron-containing biochar

Method used

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  • Device and process for strengthening two-phase anaerobic digestion by utilizing Fenton iron sludge and iron-containing biochar
  • Device and process for strengthening two-phase anaerobic digestion by utilizing Fenton iron sludge and iron-containing biochar
  • Device and process for strengthening two-phase anaerobic digestion by utilizing Fenton iron sludge and iron-containing biochar

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Experimental program
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Effect test

Embodiment 1

[0040] A process for processing organic solid waste using the above-mentioned device includes the following specific operation steps:

[0041] The excess sludge produced by a domestic sewage treatment plant is used as the raw material of organic solid waste, diluted with tap water to a solid content of about 6.3%, and the total COD concentration of the diluted sludge is about 65000g / L. The Fenton iron sludge produced by a landfill leachate treatment plant is used as the raw material. After dehydration, the solid content is 20%, the iron content (calculated as iron element) is 40%, and the organic content is 14%.

[0042] Up-flow anaerobic sludge bed reactors with working volumes of 1L and 2L were used as hydrolysis acidification reactors and methanogenesis reactors, respectively, and the anaerobic fermentation tank sludge was inoculated, so that the volume proportion of the introduced sludge in the reactors was 20% respectively. and 40%.

[0043] The dewatered Fenton iron slu...

Embodiment 2

[0052] A method for preparing iron-containing biochar using sludge and Fenton iron sludge, comprising the following steps:

[0053] The content of iron and carbon in Fenton iron sludge and anaerobic sludge was determined by elemental analyzer.

[0054] The Fenton iron sludge and the sludge from the sedimentation tank were mixed in the material conditioning tank to make the iron-carbon ratio of the mixture 1:1, and then loaded into a quartz boat.

[0055] The quartz boat containing the mixture was sent into a tube furnace, and fired at 500° C. under nitrogen atmosphere for 2 hours to convert the biomass of the sludge into biochar and ferric iron into ferric tetroxide.

[0056] When the tube furnace naturally returned to room temperature, the fired biochar was taken out and ground into powder and passed through a 100-mesh sieve. The obtained sample was the iron-containing biochar prepared from Fenton iron sludge.

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Abstract

The invention provides a device and a process for strengthening two-phase anaerobic digestion by utilizing Fenton iron sludge and iron-containing biochar. The device mainly comprises a feeding tank, a dehydration tank, a hydrolytic acidification reactor, a methanogenesis reactor, a material adjusting tank and a carbonization furnace. The process comprises the following steps: mixing organic solid wastes and Fenton iron sludge, feeding the mixture into a hydrolytic acidification reactor, and exciting a dissimilatory iron reduction process by using the Fenton iron sludge as an iron source to enhance the hydrolytic acidification efficiency of organic matters. The discharged material of the hydrolytic acidification reactor is precipitated, the precipitated supernatant is put into a methanogenesis reactor as a substrate for methanogenesis, the precipitated sludge is mixed with Fenton iron sludge to prepare iron-containing biochar, and the iron-containing biochar is put into the methanogenesis reactor as a filler. By utilizing the device and the process, the hydrolytic acidification efficiency and the methane production rate of the two-phase anaerobic process can be effectively improved, and the operation stability of the reactor is improved. And meanwhile, the reduction of the Fenton iron sludge can be realized, and the treatment cost is reduced.

Description

technical field [0001] The present invention relates to the field of solid waste recycling technology. Background technique [0002] The total amount of municipal sludge, kitchen waste, agricultural product waste, livestock manure and other organic solid wastes produced in my country is about 6.3 billion tons, and the potential to convert it into biological natural gas through anaerobic digestion can reach hundreds of billions of m3 3 , which can greatly reduce the use of high-carbon energy such as fossils in my country. It is generally believed that anaerobic digestion includes four stages of hydrolysis, acidification, hydrogen production, acetic acid production and methane production, which need to be completed by the corresponding functional microorganisms. However, because the metabolic rate of acid-producing microorganisms is often higher than that of methanogenic bacteria, the macromolecular organic matter cannot be used by methanogenic bacteria in time after hydrolys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00B09B3/65B09B3/40B09B3/70B09B101/70
CPCB09B3/00B09B5/00Y02E50/30
Inventor 张耀斌王名威赵智强
Owner DALIAN UNIV OF TECH
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