CN109939558A - A kind of method of biogas desulfurization - Google Patents

Abstract

The invention discloses a kind of methods of biogas desulfurization to contain desulfurization microorganism, significant desulfurization effect has not only saved cost, moreover it is possible to recycle with commercially available desulfurization microbial ratio the method includes carrying out biogas desulfurization using cow dung in cow dung.

Description

A kind of method of biogas desulfurization

Technical field:

The invention belongs to biogas fermentation field more particularly to a kind of biogas desulfurization methods.

Background technique:

Biogas is biomass energy, belongs to renewable resource, with rapid development of economy, organic waste, high concentration The anaerobic digestion techniques of organic wastewater are rapidly developed and are promoted, and the cleaning development and utilization of biogas is increasingly becoming main research Direction.Biogas is a kind of mixed gas, mainly in addition to this also contains H2S containing CH4 and CO2.Hydrogen sulfide to pipeline, instrument, Metal equipment has corrosivity, also, the sulfur dioxide that hydrogen sulfide generates that burns also has certain pollution to environment.How by natural pond Hydrogen sulfide in gas removes, and is the key link in biogas production process.

The method of biogas removal hydrogen sulfide has dry desulfurization, wet desulphurization and biological desulphurization.Dry desulfurization needs continually With changing desulfurizing agent, cause large labor intensity, operating cost high, large-scale application has been eliminated.Wet desulphurization uses lye (NaOH Or Na2CO3) and biogas counter current contacting removing hydrogen sulfide, by specific catalyst (naphthoquinones substance) in regeneration tank, by alkali Vulcanization hydrogen catalysis after liquid absorbs generates elemental sulfur, thiosulfate, sulfate, while lye is largely regenerated, can be after Continue and absorb hydrogen sulfide in scrubbing tower, complex process needs staff on duty, and equipment investment cost is big.Biological desulphurization is by a certain amount of sky Conductance enters in the biogas containing hydrogen sulfide, and mixed gas is by biofilter, bio-trickling filter to remove hydrogen sulfide, biological desulphurization Need to control temperature and reaction time, condition is harsh.

Biological desulfurizing technology includes biofiltration process, biosorption process and biological island, and three kinds of systems belong to Open System System, microbial population change with environment and are changed.During biological desulphurization, the sulfurous pollutants of oxidation state for biology through going back Then original work generation sulfide or H2S generate simple substance removal of sulphur through biological oxidation process again.Biological desulfurizing technology is the eighties The conventional desulfurization substitution new process to grow up, has many advantages: being not required to catalyst and oxidant (except air), be not required to locate Physicochemical sludge, generates seldom biological pollution, and sulphur, high-efficient, odorless are recycled in low energy consumption.

Summary of the invention:

The present invention provides a kind of methods of biogas desulfurization, and the method includes using cow dung to carry out the step of desulfurization to biogas Suddenly.

On the other hand, the application that the present invention also provides cow dungs in biogas desulfurization.

On the other hand, the present invention also provides cow dungs to prepare the application in biogas desulfurizer.

In one embodiment, the cow dung is the cow dung from farm.

In one embodiment, the cow dung is the cow dung by Air Exposure.

Preferably, the condition of the Air Exposure is as follows: Ventilation Rate is 1-10L/ hours, it is preferable that 3-5L/ hours；It exposes The gas time be 12-48h, preferably 24-36h, more preferably for 24 hours.

Preferably, the temperature of the Air Exposure is room temperature, is preferably carried out in aeration purification device；Preferably, described The solid content in cow dung after Air Exposure is 1-10%, preferably 3-5%.

In another embodiment, the cow dung also passes through pre-treatment step before Air Exposure；The pretreatment packet It includes: by cow dung plus water cleaning, purification, removing the silt particle in cow dung；Preferably, after adding water, solid content is 1- in cow dung water 10%, preferably 1-5%, more preferable 1-2%.

In another embodiment, cow dung can also use simultaneously with other desulfurizing agents, it is preferable that biological desulphurization agent, The biological desulphurization agent is selected from green sulfur bacteria and/or thiobacillus denitrificans.

Technical scheme is as follows:

The utility model has the advantages that the present invention using cow dung directly as desulfurizing agent, desulfurization microorganism is contained in cow dung, desulfurization effect is aobvious It writes, with commercially available desulfurization microbial ratio, has not only saved cost, moreover it is possible to recycle；If directlying adopt desulfurization microorganism Desulfurization is carried out, the growth and breeding of desulfurization microorganism needs nutriment, after biogas fermentation device has run a fermentation period, Desulfurization microbes face the risk that vigor is lost and desulphurizing ability reduces need to supplement de- again in order to improve desulfurization effect Sulphur microorganism；But the nutritional ingredient in cow dung itself can be used as substance needed for desulfurization microorganism grows, it is therefore, pure with separating The desulfurization microbial ratio of change can be recycled using cow dung directly as desulfurizing agent, and in actual use, cow dung is made 5-10 can be used for desulfurization layer, and no replacement is required, has not only saved cost, has also improved utilization efficiency.

Detailed description of the invention:

Fig. 1 biogas fermentation device schematic diagram, wherein 1- tank body, 2- tank deck, 3- desulfurization oxidant layer, 4- air storing cavity, 5- biogas Collecting pipe, 6- desulfurizing agent support device, 7- supporting course, 8- material interface, 9- column, 10- air pipeline, 11- flowmeter, 12- Regulating valve, 13- check-valves, 14- air pump.

Specific embodiment:

The preparation of 1 desulfurizing agent of embodiment

The present invention, as biogas desulfurizer, selects the cow dung from Shandong, Inner Mongol Deng Di farm, by ox using cow dung Excrement is brushed in the desulfurizing agent support device 6 of biogas fermentation device shown in FIG. 1, so as to realize the effect of biogas desulfurization.

As shown in Figure 1, biogas fermentation device includes tank body 1 and tank deck 2；Desulfurizing agent is provided between the tank body and tank deck Layer 3, in the application, desulfurization oxidant layer 3 is cow dung；Air storing cavity 4 is formed between the desulfurization oxidant layer and tank deck, is passed through for storing The biogas of desulfurization；The desulfurizing agent is placed in desulfurizing agent support device 6, and the desulfurizing agent support device is strainer, strainer Aperture is 1.5mm；The strainer is placed on supporting course 7, supporting course be at spoke-like arrangement nylon rope, from middle standing pillar 9 to Tank body 1 installs the thick nylon rope of a 8-10mm every a distance, forms supporting course.Load-bearing is placed on tank interior material circle On face 8.Collecting methane pipe 5 is additionally provided on tank deck 2, tank deck 2 is air film top, and the material on air film top is PE material, air film top The sealing of the surrounding outer on surrounding outer and tank body top.When the collecting methane in air storing cavity to a certain extent when, due in tank body Pressure increase, will lead to air film flatulence and expand, at this time can pass through collecting methane pipe discharge biogas.It is also set up on tank body 1 free Feed channel 10 is additionally provided with flowmeter 11, regulating valve 12, check-valves 13 and air pump 14 on the air pipeline 10.

In order to improve the desulfurization effect of cow dung, inventor pre-processes cow dung.Firstly, washing, purification cow dung, are removed Silt is removed, guarantees that solid content is 1-10% in cow dung water；Later, air, Ventilation Rate 2-10L/ are passed through in cow dung Hour, duration of ventilation 12-48h；The solid content in cow dung finally obtained is maintained at 1-10%.

In order to optimize the desulfurization effect of cow dung, the present invention has carried out two factorial experiments, using different Ventilation Rates and leads to The gas time pre-processes cow dung, and the desulfurization effect of cow dung under the conditions of different disposal is verified by trial test, sulphur in biogas before handling The content for changing hydrogen is 2000ppm, experimental design and the results are shown in Table 1.

Influence of the 1 cow dung pretreating process of table to desulfurization effect

Note: the hydrogen sulfide content in table 1 before biogas treatment is 2000ppm

As shown in Table 1, when duration of ventilation lower than 20 it is small when or be higher than 36 it is small when, the desulfurization effect of cow dung is bad, This is because the too short breeding for being unfavorable for desulfurization microorganism in cow dung of duration of ventilation, still, if the time is too long, other in cow dung Microorganism also can mass propagation, the desulfurization effect of desulfurization microorganism can be weakened.When duration of ventilation is in 20-36h, Ventilation Rate 3-7L/ hours, the desulfurization effect of cow dung was preferable, especially duration of ventilation be for 24 hours, Ventilation Rate be 3-5L/ hours, cow dung Desulfurization effect is best.

All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system reality For applying example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring to embodiment of the method Part explanation.

The above description is only an example of the present application, is not intended to limit this application.For those skilled in the art For, various changes and changes are possible in this application.All any modifications made within the spirit and principles of the present application are equal Replacement, improvement etc., should be included within the scope of the claims of this application.

Claims (10)

1. a kind of method of biogas desulfurization, which is characterized in that the method includes using cow dung to carry out desulfurization to biogas.

2. the method according to claim 1, wherein the cow dung is the cow dung by Air Exposure.

3. according to the method described in claim 2, it is characterized in that, the condition of the Air Exposure is as follows: Ventilation Rate 1- 10L/ hours, it is preferable that 3-5L/ hours；Aeration time is 12-48h, preferably 24-36h, more preferably for 24 hours.

4. according to the method in claim 2 or 3, which is characterized in that the temperature of the Air Exposure is room temperature, is preferably being exposed It is carried out in air purifying apparatus.

5. according to method described in claim 2-4, which is characterized in that the solid content in cow dung after the Air Exposure For 1-10%, preferably 3-5%.

6. according to method described in claim 2-5, which is characterized in that the cow dung is before Air Exposure also by pretreatment step Suddenly；The pretreatment includes: that cow dung is added water cleaning, purification, removes the silt particle in cow dung.

7. according to the method described in claim 6, it is characterized in that, solid content is 1- in cow dung water after cow dung adds water 10%, preferably 1-5%, more preferable 1-2%.

8. method described in -7 according to claim 1, which is characterized in that the cow dung can also make simultaneously with other desulfurizing agents With；Preferably, the desulfurizing agent is biological desulfurizing agent, it is furthermore preferred that the biological desulphurization agent is selected from green sulfur bacteria and/or takes off Nitrogen Thiobacillus.

9. application of the cow dung in biogas desulfurization.

10. cow dung is preparing the application in biogas desulfurizer.