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A method for combined removal of hydrogen sulfide from biogas with iron-containing compound and mesophilic acidophilic thiobacterium

A technology of acidic thiobacillus and iron compounds, which is applied in the direction of chemical instruments and methods, separation methods, bacteria, etc., can solve the problem that the desulfurization stability is easily affected by the ambient temperature, etc., to achieve reduced amount, high removal efficiency, Effect of reducing cost and workload

Active Publication Date: 2019-10-22
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its desulfurization stability is easily affected by the ambient temperature.

Method used

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  • A method for combined removal of hydrogen sulfide from biogas with iron-containing compound and mesophilic acidophilic thiobacterium

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Experimental program
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Effect test

Embodiment 1

[0027] This embodiment provides a method of adding different concentrations of FeCl 2 On-line desulfurization and biological desulfurization by adding mesophilic acidophilic thiobacterium strains were used to jointly remove hydrogen sulfide from biogas.

[0028]Step 1: Carry out recovery culture of mesophilic acidophilus Thiobacillus strain, draw 0.3~0.5mL of 9K medium with a sterile pipette, drop it into the ampoule, shake gently, so that the freeze-dried bacteria dissolve and form a suspension, absorb all The bacterial suspension was transferred to 5 mL of 9K medium, and the stirring speed was 170 r / min, and the temperature was 40-45 ° C for 48-72 hours. Since the strains were stored in freeze-drying, the lag period was long, so the cultured one generation The mesophilic acidophilus thiobacillus culture solution was inoculated into 5mL liquid medium at an inoculum volume of 3%~5%, and the same culture conditions were carried out for two consecutive subcultures, and the recov...

Embodiment 2

[0042] This embodiment provides a method of adding different concentrations of Fe(OH) 3 On-line desulfurization and biological desulfurization by adding mesophilic acidophilic thiobacterium strains were used to jointly remove hydrogen sulfide from biogas.

[0043] Step 1, take 7 groups of desulfurization devices, numbered C0 to C6, and add 80mL of the fermentation broth obtained in step 2 to each desulfurization device A;

[0044] Step 2: Take 7 groups of combined desulfurization devices, numbered D0 to D6, add 80 mL of the fermentation broth obtained in step 2 of Example 1 to each combined desulfurization device A, add 80 mL of 9K medium to each combined desulfurization device B, and inoculate 3%~ 5% the mesophilic acidophilus bacterium liquid obtained in step 1 of embodiment 1;

[0045] Step 3, do a blank test without adding iron-containing compounds to the A device of C0, and add Fe(OH) to the A device of C1-C6 in sequence 3 The amount is 0.16mmol, 0.32 mmol, 0.64 mmol, 0...

Embodiment 3

[0055] This embodiment provides a kind of Fe(OH) 3 , FeCl 2 and FeCl 3 According to the online desulfurization mixed in different proportions and the biological desulfurization with mesophilic acidophilus thiobacterium strains, the experiment of joint removal of hydrogen sulfide in biogas was carried out.

[0056] Step 1: Take 8 groups of desulfurization devices, numbered E0 to E7, and add 80 mL of the fermentation broth obtained in step 2 to each desulfurization device A;

[0057] Step 2: Take 8 groups of combined desulfurization devices, numbered F0 to F7, add 80 mL of the fermentation broth obtained in step 2 of Example 1 to each combined desulfurization device A, add 80 mL of 9K medium to each combined desulfurization device B, and inoculate 3%~ 5% the mesophilic acidophilus bacterium liquid obtained in step 1 of embodiment 1;

[0058] Step 3, use No. E0 A device as a blank test without adding iron-containing compounds, and add 2.88 mmol FeCl in turn to E1-E7 A devices ...

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Abstract

The invention discloses a method for removing hydrogen sulfide in biogas through combination of an iron-containing compound and Acidithiobacillus caldus. The method comprises 1) iron-containing compound desulfurization: adding an iron-containing compound along with fed materials into a biogas production reactor and carrying out synchronous biogas raw material fermentation and iron-containing compound desulfurization, and 2) biological desulfurization: feeding the biogas subjected to iron-containing compound desulfurization into the fermentation liquid of Acidithiobacillus caldus, detecting hydrogen sulfide content of the biogas and collecting the biogas when the hydrogen sulfide content satisfies the standard. The method has high desulfurization efficiency and reduces the cost and workload of later desulfurization processes. After the combined removal, the hydrogen sulfide content of the biogas is less than 5ppm and more preferably less than 1ppm so that it is proved that the hydrogen sulfide is substantially completely removed.

Description

technical field [0001] The invention belongs to the technical field of bioenergy, and in particular relates to a method for jointly removing hydrogen sulfide in biogas with iron-containing compounds and mesophilic acidophilic thiobacteria. Background technique [0002] With the rapid development of the economy, the demand for energy around the world is increasing day by day. In the energy structure, fossil energy such as oil and coal still occupies a dominant position. If human beings rely too much on these traditional fossil energy, their non-renewability will definitely cause an energy crisis. As a new green energy, biogas has gradually attracted people's attention. Biogas is a mixed gas, generally containing CH 4 60%~70%, CO 2 30%~40%, a small amount of H 2 S, water vapor, NH 3 Wait. Among them, hydrogen sulfide is harmful to personal safety, environment and equipment. For personal safety, hydrogen sulfide has a strong stimulating effect on mucous membranes and is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/10B01D53/84B01D53/52C12P5/02C12N1/20
CPCB01D53/52B01D53/84B01D2258/05C10L3/103C12N1/20C12P5/023Y02A50/20Y02E50/30
Inventor 贾红华韩周周俊壅晓雨陈非儿周华姜岷韦萍
Owner NANJING TECH UNIV
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