CN114394724A - Method for improving sludge anaerobic fermentation hydrogen yield by using calcium hypochlorite - Google Patents
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- 239000010802 sludge Substances 0.000 title claims abstract description 108
- 238000000855 fermentation Methods 0.000 title claims abstract description 74
- 239000001257 hydrogen Substances 0.000 title claims abstract description 64
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 64
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000004151 fermentation Effects 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 238000011049 filling Methods 0.000 claims abstract description 13
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
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- 239000010865 sewage Substances 0.000 claims abstract description 10
- 238000007873 sieving Methods 0.000 claims abstract description 4
- 238000001914 filtration Methods 0.000 claims abstract description 3
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 239000007787 solid Substances 0.000 claims description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 5
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
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- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 2
- 230000003403 homoacetogenic effect Effects 0.000 abstract description 2
- 238000004090 dissolution Methods 0.000 abstract 1
- 230000000696 methanogenic effect Effects 0.000 abstract 1
- 244000005700 microbiome Species 0.000 description 11
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- -1 hydroxide ions Chemical class 0.000 description 2
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
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- 239000002028 Biomass Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 235000014113 dietary fatty acids Nutrition 0.000 description 1
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- 229930195729 fatty acid Natural products 0.000 description 1
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- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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- C02F11/06—Treatment of sludge; Devices therefor by oxidation
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Abstract
The invention relates to a method for improving the yield of sludge anaerobic fermentation hydrogen by using calcium hypochlorite, which comprises the following steps: (1) taking excess sludge generated by a secondary sedimentation tank of a municipal sewage treatment plant, and obtaining concentrated sludge after sieving, filtering and sedimentation; (2) adding calcium hypochlorite into the concentrated sludge, stirring and mixing, then filling into an anaerobic reactor, and performing fermentation reaction in an anaerobic environment to generate hydrogen, thus completing the process. Compared with the prior art, the added calcium hypochlorite can effectively break the sludge floc structure, promote the dissolution of organic matters in the sludge and provide more fermentation substrates for hydrogen production; meanwhile, the calcium hypochlorite can reduce the consumption of hydrogen by sulfate reducing bacteria, homoacetogenic bacteria, hydrogenotrophic methanogenic bacteria and the like.
Description
Technical Field
The invention belongs to the technical field of sludge treatment and resource utilization, and relates to a method for improving the yield of sludge anaerobic fermentation hydrogen by using calcium hypochlorite.
Background
Under the large background that the urbanization process is continuously promoted, the sewage treatment capacity of China is greatly improved in recent years, and the generation amount of excess sludge is rapidly increased. The related data show that the total output of the excess sludge in China exceeds 6000 million tons (the water content is 80%) in 2020. How to properly treat the excess sludge and avoid secondary pollution to the environment becomes a difficult problem for governments and sewage treatment plant managers. The residual sludge contains a large amount of organic substances including proteins, carbohydrates, lipid substances and the like, and if the organic substances can be fully and effectively utilized, the waste can be changed into valuable resources.
Anaerobic fermentation is an effective path for recycling sludge, can realize sludge reduction and stabilization, and can convert organic matters in the sludge into volatile fatty acid and hydrogen to realize resource recovery. Hydrogen has a high calorific value (142.35kg/g) as a clean energy source, and thus has received wide attention worldwide as an energy source substance. The method takes the excess sludge as a substrate and recovers the hydrogen through an anaerobic fermentation technology, and has great significance for environmental protection and energy structure optimization in China. However, the conventional sludge anaerobic fermentation process has the problems of low hydrogen yield and low hydrogen production rate, and the large-scale application of the technology is prevented.
Disclosure of Invention
The invention aims to provide a method for improving the yield of sludge anaerobic fermentation hydrogen by using calcium hypochlorite so as to improve the anaerobic fermentation efficiency and greatly improve the yield of hydrogen.
The purpose of the invention can be realized by the following technical scheme:
a method for improving the yield of sludge anaerobic fermentation hydrogen by using calcium hypochlorite comprises the following steps:
(1) taking excess sludge generated by a secondary sedimentation tank of a municipal sewage treatment plant, and obtaining concentrated sludge after sieving, filtering and sedimentation;
(2) adding calcium hypochlorite into the concentrated sludge, stirring and mixing, then filling into an anaerobic reactor, and performing fermentation reaction in an anaerobic environment to generate hydrogen, thus completing the process.
Further, in the step (1), the concentration of the concentrated sludge is 22000-24000 mg/L calculated by the total suspended solids, wherein the mass ratio of the volatile suspended solids to the total suspended solids is 55-60%.
Further, in the step (1), the environmental temperature in the precipitation process is controlled to be 2-4 ℃, and the precipitation time is 1-1.5 days. In addition, the screening process used a 10 mesh stainless steel screen.
Further, in the step (2), calcium hypochlorite is added to the concentrated sludge in the form of solid powder, and the adding amount of the calcium hypochlorite is 0.2-1.8 g/L (concentrated sludge) based on the mass of the impure solid powder. Specifically, the amount of calcium hypochlorite added may be selected from 0.2g/L, 0.4g/L, 0.6g/L, 0.8g/L, 1.0g/L, 1.2g/L, 1.5g/L or 1.8g/L, preferably 1.5 g/L.
Furthermore, the purity of the calcium hypochlorite solid powder is 60-70%.
Further, in the step (2), nitrogen is firstly introduced into the anaerobic reactor to remove air so as to create an anaerobic environment.
Further, in the step (2), the temperature of the fermentation reaction is controlled to be 27-39 ℃, the stirring speed is controlled to be 130-180 rpm in the reaction process, and the time is 5-10 days.
Furthermore, in the step (2), the temperature of the fermentation reaction is controlled to be 34-36 ℃, and the stirring speed is controlled to be 150rpm in the reaction process.
Further, in the step (2), the generated hydrogen is collected every 0.5 days during the fermentation reaction.
Further, sludge fermentation liquor generated by fermentation reaction in the anaerobic reactor and municipal sewage are sequentially treated in the biochemical reaction tank and the secondary sedimentation tank.
The method utilizes the calcium hypochlorite to break the sludge floc, promotes a large amount of organic matters in the sludge to be dissolved into the sludge liquid phase, and further improves the hydrogen production efficiency. After the calcium hypochlorite is added into the sludge, the calcium hypochlorite can be rapidly hydrolyzed to generate hypochlorous acid and generate a large amount of hydroxide ions. The hypochlorous acid has strong oxidizing property, and can directly break extracellular polymeric substances and microbial cell membranes in the sludge to dissolve organic substances in the sludge into a sludge liquid phase to be used as a fermentation substrate for producing hydrogen. Meanwhile, the alkaline environment created by the hydroxyl ions is also beneficial to dissolving out the organic matters in the sludge, and the concentration of the dissolved organic matters is further improved. Besides promoting the sludge cracking and improving the hydrogen production efficiency, the calcium hypochlorite can also inhibit the activity of hydrogen consuming microorganisms such as sulfate reducing bacteria, homoacetogenic bacteria, hydrogenotrophic methanogens and the like, so that the consumption of the hydrogen is reduced, and the yield of the hydrogen is improved.
The invention limits the process conditions of the concentration of the concentrated sludge, the adding amount of calcium hypochlorite, the temperature and the stirring speed in the anaerobic fermentation reaction process, and the like. The concentration range of the concentrated sludge is 22000-24000 mg/L, the treatment effect is influenced by overhigh concentration, the sludge is not cracked completely, the highest hydrogen yield cannot be realized, the living biomass is insufficient due to overlow concentration, and the anaerobic fermentation efficiency is reduced. The adding range of the calcium hypochlorite is 0.2-1.8 g/L, the adding amount is not obvious in improvement of the hydrogen yield when being too low, and the hydrogen yield can be reduced when being too high.
Drawings
FIG. 1 is a graph showing the degradation rate of Volatile Suspended Solids (VSS) in examples 1-8 and comparative example 1;
FIG. 2 is a graph showing the change in dissolved chemical oxygen demand (SCOD) concentration 3 days before fermentation in examples 1 to 8 and comparative example 1;
FIG. 3 is a process flow diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the following examples, unless otherwise specified, all the conventional commercially available raw materials or conventional processing techniques in the art are indicated.
The excess sludge used in the following examples was obtained from the secondary sedimentation tank of a sewage treatment plant of Bailonggang, Shanghai. Screening and settling the residual sludge, removing supernatant and concentrating to obtain concentrated sludge for anaerobic fermentation reaction; a 10-mesh screen is adopted in the screening process; the concentration (calculated by total suspended solids) of the obtained concentrated sludge is 22000-24000 mg/L, and the proportion of volatile suspended solids to total suspended solids is 55-60%.
The process of the invention is shown in figure 3, namely, the excess sludge generated by a secondary sedimentation tank 2 of a municipal sewage treatment plant is sent into a sludge concentration tank 3 for sieving and sedimentation to obtain concentrated sludge, and then the concentrated sludge is sent into an anaerobic reactor 4 after being mixed with added calcium hypochlorite to generate hydrogen output, and simultaneously, the obtained sludge fermentation liquor and the municipal sewage are recycled and are sequentially treated by a biochemical reaction tank 1 and the secondary sedimentation tank 2.
In the following examples, calcium hypochlorite having a purity of 60 to 70% was purchased from Shanghai Aladdin.
Example 1
(1) Adding the screened residual sludge into an organic glass reactor with the working volume of 1L, settling for 1 day in an environment at 4 ℃, and removing the supernatant to obtain a raw material for anaerobic fermentation (namely a concentrated sludge sample).
(2) 0.2g/L of calcium hypochlorite is added into the reactor and stirred uniformly to fully disperse and dissolve the calcium hypochlorite. And then, filling nitrogen into the reactor for 3min to create an oxygen-free environment, sealing, and then placing the reactor in a constant-temperature shaking table for anaerobic fermentation reaction. Under the action of various functional microorganisms in the sludge, organic matters in the sludge are converted into hydrogen. The whole anaerobic fermentation process lasts for 10 days, the temperature is controlled to be 35 +/-1 ℃, the stirring speed is 150rpm, and the cumulative hydrogen yield is 2.65mL/g VSS.
Example 2
(1) Adding the screened residual sludge into an organic glass reactor with the working volume of 1L, settling for 1 day in an environment at 4 ℃, and removing the supernatant to obtain a raw material for anaerobic fermentation (namely a concentrated sludge sample).
(2) 0.4g/L of calcium hypochlorite is added into the reactor and stirred uniformly to fully disperse and dissolve the calcium hypochlorite. And then, filling nitrogen into the reactor for 3min to create an oxygen-free environment, sealing, and then placing the reactor in a constant-temperature shaking table for anaerobic fermentation reaction. Under the action of various functional microorganisms in the sludge, organic matters in the sludge are converted into hydrogen. The whole anaerobic fermentation process lasts for 10 days, the temperature is controlled to be 35 +/-1 ℃, the stirring speed is 150rpm, and the cumulative hydrogen yield is 5.13mL/g VSS.
Example 3
(1) Adding the screened residual sludge into an organic glass reactor with the working volume of 1L, settling for 1 day in an environment at 4 ℃, and removing the supernatant to obtain a raw material for anaerobic fermentation (namely a concentrated sludge sample).
(2) 0.6g/L of calcium hypochlorite is added into the reactor and stirred uniformly to fully disperse and dissolve the calcium hypochlorite. And then, filling nitrogen into the reactor for 3min to create an oxygen-free environment, sealing, and then placing the reactor in a constant-temperature shaking table for anaerobic fermentation reaction. Under the action of various functional microorganisms in the sludge, organic matters in the sludge are converted into hydrogen. The whole anaerobic fermentation process lasts for 10 days, the temperature is controlled to be 35 +/-1 ℃, the stirring speed is 150rpm, and the cumulative hydrogen yield is 7.47mL/g VSS.
Example 4
(1) Adding the screened residual sludge into an organic glass reactor with the working volume of 1L, settling for 1 day in an environment at 4 ℃, and removing the supernatant to obtain a raw material for anaerobic fermentation (namely a concentrated sludge sample).
(2) 0.8g/L of calcium hypochlorite is added into the reactor and stirred uniformly to fully disperse and dissolve the calcium hypochlorite. And then, filling nitrogen into the reactor for 3min to create an oxygen-free environment, sealing, and then placing the reactor in a constant-temperature shaking table for anaerobic fermentation reaction. Under the action of various functional microorganisms in the sludge, organic matters in the sludge are converted into hydrogen. The whole anaerobic fermentation process lasts for 10 days, the temperature is controlled to be 35 +/-1 ℃, the stirring speed is 150rpm, and the cumulative hydrogen yield is 9.47mL/g VSS.
Example 5
(1) Adding the screened residual sludge into an organic glass reactor with the working volume of 1L, settling for 1 day in an environment at 4 ℃, and removing the supernatant to obtain a raw material for anaerobic fermentation (namely a concentrated sludge sample).
(2) Adding 1.0g/L calcium hypochlorite into the reactor, and uniformly stirring to fully disperse and dissolve the calcium hypochlorite. And then, filling nitrogen into the reactor for 3min to create an oxygen-free environment, sealing, and then placing the reactor in a constant-temperature shaking table for anaerobic fermentation reaction. Under the action of various functional microorganisms in the sludge, organic matters in the sludge are converted into hydrogen. The whole anaerobic fermentation process lasts for 10 days, the temperature is controlled to be 35 +/-1 ℃, the stirring speed is 150rpm, and the cumulative hydrogen yield is 11.42mL/g VSS.
Example 6
(1) Adding the screened residual sludge into an organic glass reactor with the working volume of 1L, settling for 1 day in an environment at 4 ℃, and removing the supernatant to obtain a raw material for anaerobic fermentation (namely a concentrated sludge sample).
(2) Adding 1.2g/L calcium hypochlorite into the reactor, and uniformly stirring to fully disperse and dissolve the calcium hypochlorite. And then, filling nitrogen into the reactor for 3min to create an oxygen-free environment, sealing, and then placing the reactor in a constant-temperature shaking table for anaerobic fermentation reaction. Under the action of various functional microorganisms in the sludge, organic matters in the sludge are converted into hydrogen. The whole anaerobic fermentation process lasts for 10 days, the temperature is controlled to be 35 +/-1 ℃, the stirring speed is 150rpm, and the cumulative hydrogen yield is 12.87mL/g VSS.
Example 7
(1) Adding the screened residual sludge into an organic glass reactor with the working volume of 1L, settling for 1 day in an environment at 4 ℃, and removing the supernatant to obtain a raw material for anaerobic fermentation (namely a concentrated sludge sample).
(2) Adding 1.5g/L calcium hypochlorite into the reactor, and uniformly stirring to fully disperse and dissolve the calcium hypochlorite. And then, filling nitrogen into the reactor for 3min to create an oxygen-free environment, sealing, and then placing the reactor in a constant-temperature shaking table for anaerobic fermentation reaction. Under the action of various functional microorganisms in the sludge, organic matters in the sludge are converted into hydrogen. The whole anaerobic fermentation process lasts for 10 days, the temperature is controlled to be 35 +/-1 ℃, the stirring speed is 150rpm, and the cumulative hydrogen yield is 17.06mL/g VSS.
Example 8
(1) Adding the screened residual sludge into an organic glass reactor with the working volume of 1L, settling for 1 day in an environment at 4 ℃, and removing the supernatant to obtain a raw material for anaerobic fermentation (namely a concentrated sludge sample).
(2) Adding 1.8g/L calcium hypochlorite into the reactor, and uniformly stirring to fully disperse and dissolve the calcium hypochlorite. And then, filling nitrogen into the reactor for 3min to create an oxygen-free environment, sealing, and then placing the reactor in a constant-temperature shaking table for anaerobic fermentation reaction. Under the action of various functional microorganisms in the sludge, organic matters in the sludge are converted into hydrogen. The whole anaerobic fermentation process lasts for 10 days, the temperature is controlled to be 35 +/-1 ℃, the stirring speed is 150rpm, and the cumulative hydrogen yield is 14.06mL/g VSS.
Example 9
(1) Adding the screened residual sludge into an organic glass reactor with the working volume of 1L, settling for 1 day in an environment at 4 ℃, and removing the supernatant to obtain a raw material for anaerobic fermentation (namely a concentrated sludge sample).
(2) Adding 1.5g/L calcium hypochlorite into the reactor, and uniformly stirring to fully disperse and dissolve the calcium hypochlorite. And then, filling nitrogen into the reactor for 3min to create an oxygen-free environment, sealing, and then placing the reactor in a constant-temperature shaking table for anaerobic fermentation reaction. Under the action of various functional microorganisms in the sludge, organic matters in the sludge are converted into hydrogen. The whole anaerobic fermentation process was continued for 3 days while the temperature was controlled at 35. + -. 1 ℃ and the stirring speed was 150rpm, and the cumulative hydrogen production was 14.32mL/g VSS.
Comparative example 1
(1) Adding the screened residual sludge into an organic glass reactor with the working volume of 1L, settling for 1 day in an environment at 4 ℃, and removing the supernatant to obtain a raw material for anaerobic fermentation (namely a concentrated sludge sample).
(2) And (3) filling nitrogen into the reactor for 3min to create an oxygen-free environment, sealing, and placing the reactor in a constant-temperature shaking table for anaerobic fermentation reaction. Under the action of various functional microorganisms in the sludge, organic matters in the sludge are converted into hydrogen. The whole anaerobic fermentation process lasts for 10 days, the temperature is controlled to be 35 +/-1 ℃, the stirring speed is 150rpm, and the cumulative hydrogen yield is 2.01mL/g VSS.
The hydrogen yields of examples 1 to 9 and comparative example 1 are shown in table 1. It can be seen that the hydrogen production of examples 1 to 9 is significantly improved compared to comparative example 1, wherein the improvement of example 7 is 7.49 times as much as that of comparative example 1, that is, the optimum calcium hypochlorite concentration for promoting the anaerobic fermentation of sludge to produce hydrogen is 1.5 g/L.
TABLE 1
The degradation rate of VSS and the concentration of SCOD after calcium hypochlorite treatment in examples 1-8 and comparative example 1 are shown in FIGS. 1 and 2, respectively. Wherein, the degradation rate of VSS is measured after 1 day of fermentation, and the method is introduced in the water and wastewater standard test method published by Chinese architecture industry publishers; the concentration of SCOD was measured 3 days before fermentation using a hashed COD kit. It can be seen that the VSS degradation rate of comparative example 1 is only 2.8%, while the VSS degradation rate of example 7 is 10.2%, indicating that calcium hypochlorite greatly promotes the sludge cracking, so that a large amount of sludge solids are dissolved into the liquid phase, which results in a significant increase in SCOD concentration, provides more substrate for the anaerobic fermentation hydrogen production, and is beneficial to improving the hydrogen production efficiency.
Example 10:
compared with example 7, most of them are the same except that in this example, the temperature is controlled to 35. + -. 1 ℃ instead of 27. + -. 1 ℃.
Example 11:
compared with example 7, most of them are the same except that in this example, the temperature is controlled to 35. + -. 1 ℃ instead of 39. + -. 1 ℃.
Example 12:
compared with example 7, most of the results were the same, except that in this example, the stirring speed was changed to 150r/min and 130 r/min.
Example 13:
compared with example 7, most of the results were the same, except that in this example, the stirring speed was changed from 150r/min to 180 r/min.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A method for improving the yield of sludge anaerobic fermentation hydrogen by using calcium hypochlorite is characterized by comprising the following steps:
(1) taking excess sludge generated by a secondary sedimentation tank of a municipal sewage treatment plant, and obtaining concentrated sludge after sieving, filtering and sedimentation;
(2) adding calcium hypochlorite into the concentrated sludge, stirring and mixing, then filling into an anaerobic reactor, and performing fermentation reaction in an anaerobic environment to generate hydrogen, thus completing the process.
2. The method for improving hydrogen yield of sludge anaerobic fermentation by using calcium hypochlorite according to claim 1, wherein in the step (1), the concentration of the concentrated sludge is 22000-24000 mg/L calculated by total suspended solids, wherein the mass ratio of volatile suspended solids to total suspended solids is 55-60%.
3. The method for improving the hydrogen yield of anaerobic sludge fermentation by using calcium hypochlorite according to claim 1, wherein in the step (1), the environmental temperature in the precipitation process is controlled to be 2-4 ℃, and the precipitation time is 1-1.5 days.
4. The method for improving hydrogen production in anaerobic fermentation of sludge by using calcium hypochlorite as claimed in claim 1, wherein in the step (2), the calcium hypochlorite is added to the concentrated sludge in the form of solid powder in an amount of 0.2-1.8 g/L.
5. The method for improving the hydrogen yield of the anaerobic fermentation of sludge by using the calcium hypochlorite as claimed in claim 4, wherein the purity of the calcium hypochlorite solid powder is 60-70%.
6. The method for improving hydrogen yield of sludge anaerobic fermentation by using calcium hypochlorite as claimed in claim 1, wherein in step (2), nitrogen is introduced into the anaerobic reactor to remove air so as to create an anaerobic environment.
7. The method for improving the hydrogen yield of anaerobic sludge fermentation by using calcium hypochlorite according to claim 1, wherein in the step (2), the fermentation reaction temperature is controlled to be 27-39 ℃, the stirring speed is controlled to be 130-180 rpm in the reaction process, and the time is 5-10 days.
8. The method for improving the hydrogen yield of the anaerobic fermentation of the sludge by utilizing the calcium hypochlorite as claimed in claim 7, wherein in the step (2), the temperature of the fermentation reaction is controlled to be 34-36 ℃, and the stirring speed in the reaction process is controlled to be 150 rpm.
9. The method for improving hydrogen production in anaerobic fermentation of sludge by using calcium hypochlorite as claimed in claim 1, wherein in the step (2), the generated hydrogen is collected every 0.5 days during the fermentation reaction.
10. The method for improving hydrogen production of sludge anaerobic fermentation by using calcium hypochlorite as claimed in claim 1, wherein the sludge fermentation liquid generated by fermentation reaction in the anaerobic reactor can be used as a supplementary carbon source for sewage biochemical reaction tank.
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| CN116081908A (en) * | 2023-02-10 | 2023-05-09 | 青岛理工大学 | Method for removing pathogens and antibiotics in chicken manure and improving methane and hydrogen yield |
Citations (5)
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