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Method for biologically removing sulfureted hydrogen from marsh gas

A biological method, hydrogen sulfide technology, applied in the direction of chemical instruments and methods, separation methods, gas fuel, etc., can solve the problems of secondary pollution, complex regeneration process, high cost, etc. simple effect

Inactive Publication Date: 2010-07-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physicochemical methods include metal oxide oxidation method, activated carbon adsorption method, lye absorption method, etc. Among them, metal oxide oxidation method and activated carbon adsorption process are used for regeneration process, which is complicated and easy to cause secondary pollution, and lye absorption method cannot be recycled, resulting in relatively high cost. high
Biological activated sludge process and biofilter process currently exist in the biological process. The biological activated sludge process is complicated to operate and the cost is high. The biofilter process needs to pass air into the biogas, which has certain safety risks.

Method used

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  • Method for biologically removing sulfureted hydrogen from marsh gas
  • Method for biologically removing sulfureted hydrogen from marsh gas

Examples

Experimental program
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Effect test

Embodiment 1

[0020] In this embodiment, the packed spray absorption tower 1 has a height of 1 m, a diameter of 0.25 m, and a built-in polypropylene filler 3 with a height of about 0.5 m. A spray device 4 is installed on the top of the absorption tower. h 2 Biogas with an S content of 300ppm enters the tower through the biogas inlet pipe 8 in the middle of the absorption tower 1, and diffuses to the top of the tower through the packing 3 of the absorption tower 1 under the action of pressure. The residence time of the biogas in the absorption tower 1 is 2 minutes. The spray 4 at the top of the tower will contain Na 2 CO 3 The spray liquid with NaOH is sprayed on the filler 3 of the packing layer, the total volume of the spray liquid is 10L, and the biogas reacts with the spray liquid in the process of upward diffusion as follows:

[0021] h 2 S+OH-=HS-+H 2 O (1)

[0022] h 2 S+CO 3 2- =HS-+HCO 3 - (2)

[0023] CO 2 +OH-=HCO 3 - (3)

[0024] HCO ...

Embodiment 2

[0031] Embodiment 2: the difference between this embodiment and embodiment 1 is: the residence time of the biogas in the absorption tower 1 is 1.5min, and the H in the biogas in the biogas outlet pipe 17 of the absorption tower 1 2 The concentration of S is 21ppm, and the purification rate is 93%; 2 78% of the spraying liquid of S is sent back to the absorption tower 1 for circulating spraying, and the other 22% of the spraying liquid is mixed with 6ml / h nutrient solution and enters the biological filter tower 2; the residence time of the mixed liquid in the biological filter tower 2 for 30min.

Embodiment 3

[0032] Embodiment 3: the difference between this embodiment and embodiment 1 is: the residence time of the biogas in the absorption tower 1 is 1min; in the biogas in the biogas outlet pipe 17 of the absorption tower 1, H 2The concentration of S is 24ppm, and the purification rate is 92%; 2 70% of the spraying liquid of S is transported back to the absorption tower 1 for circulating spraying, and the other 30% of the spraying liquid is mixed with 7.5ml / h nutrient solution and enters the biological filter tower 2; The residence time is 60min.

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Abstract

The invention discloses a method for biologically removing sulfureted hydrogen from a marsh gas, which comprises the following steps: (1) introducing the marsh gas from an air inlet of a filling spray absorber; (2) removing the H2S from the marsh gas by filling and reacting the marsh gas with spray liquid, wherein the spray liquid is a solution containing NaOH and Na2CO3; (3) discharging the purified marsh gas and the spray liquid absorbing the H2S from the absorber; (4) delivering a part of the spray liquid discharged from the absorber back to the absorber for circulated spray, adding a nutrient fluid into the other part of the spray liquid and then delivering the other part of the spray liquid into a biological filtration tower, wherein the nutrient fluid contains a nitrogen source and a phosphorus source; (5) spraying the mixed solution of the spray liquid and the nutrient fluid delivered to the biological filtration tower onto a biological filter material, introducing air from the air inlet of the biological filtration tower to allow microorganisms in the biological filter material to convert sulphions in the mixed solution into sulphate with the oxygen in the air; and (6) delivering the solution which is obtained by the treatment in the step (5) and serves as the spray liquid into the packed spray absorber for cycle use.

Description

technical field [0001] The invention relates to a biological method for removing hydrogen sulfide from biogas, which belongs to the technical field of environmental protection. Background technique [0002] Biogas is a renewable biomass energy, but the hydrogen sulfide contained in biogas is a highly toxic, foul-smelling, corrosive gas, H 2 The odor of S is very low, only 0.5ppb, and it has strong respiratory and neurotoxicity, and it stays at 300ppmH for a long time. 2 In the S environment, it will cause danger to life, while in the H environment 2 It only takes a few minutes for the S concentration to be higher than 2000ppm to be fatal. The concentration of hydrogen sulfide in biogas is generally 200-400ppm, so it must be desulfurized effectively before use. At present, the main methods of biogas desulfurization are physicochemical method and biological method. Physicochemical methods include metal oxide oxidation, activated carbon adsorption, lye absorption, etc. Amon...

Claims

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Application Information

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IPC IPC(8): B01D53/84B01D53/78B01D53/52C10L3/10
CPCY02A50/20
Inventor 史惠祥次新波万先凯
Owner ZHEJIANG UNIV
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