CN115893784A - Method for reducing hydrogen sulfide generation in sludge treatment process - Google Patents
Method for reducing hydrogen sulfide generation in sludge treatment process Download PDFInfo
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- CN115893784A CN115893784A CN202211524284.5A CN202211524284A CN115893784A CN 115893784 A CN115893784 A CN 115893784A CN 202211524284 A CN202211524284 A CN 202211524284A CN 115893784 A CN115893784 A CN 115893784A
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- sludge
- hydrogen sulfide
- calcium peroxide
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- 239000010802 sludge Substances 0.000 title claims abstract description 67
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000019086 sulfide ion homeostasis Effects 0.000 title claims abstract description 13
- 230000008569 process Effects 0.000 title claims abstract description 10
- 239000004343 Calcium peroxide Substances 0.000 claims abstract description 44
- LHJQIRIGXXHNLA-UHFFFAOYSA-N calcium peroxide Chemical compound [Ca+2].[O-][O-] LHJQIRIGXXHNLA-UHFFFAOYSA-N 0.000 claims abstract description 44
- 235000019402 calcium peroxide Nutrition 0.000 claims abstract description 44
- 238000000855 fermentation Methods 0.000 claims abstract description 35
- 230000004151 fermentation Effects 0.000 abstract description 14
- 239000010865 sewage Substances 0.000 abstract description 13
- 239000002994 raw material Substances 0.000 abstract description 9
- 239000006228 supernatant Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 abstract description 3
- 241000894006 Bacteria Species 0.000 abstract description 2
- 102000004190 Enzymes Human genes 0.000 abstract description 2
- 108090000790 Enzymes Proteins 0.000 abstract description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 2
- 230000000813 microbial effect Effects 0.000 abstract description 2
- 231100000331 toxic Toxicity 0.000 abstract description 2
- 230000002588 toxic effect Effects 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 206010011224 Cough Diseases 0.000 description 1
- 206010023644 Lacrimation increased Diseases 0.000 description 1
- 206010028813 Nausea Diseases 0.000 description 1
- 101710138657 Neurotoxin Proteins 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000009360 aquaculture Methods 0.000 description 1
- 244000144974 aquaculture Species 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000004317 lacrimation Effects 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000008693 nausea Effects 0.000 description 1
- 239000002581 neurotoxin Substances 0.000 description 1
- 231100000618 neurotoxin Toxicity 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000004666 short chain fatty acids Chemical class 0.000 description 1
- 235000021391 short chain fatty acids Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002602 strong irritant Substances 0.000 description 1
- 238000013268 sustained release Methods 0.000 description 1
- 239000012730 sustained-release form Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 210000004916 vomit Anatomy 0.000 description 1
- 230000008673 vomiting Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Landscapes
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a method for reducing hydrogen sulfide generation in a sludge treatment process by intermittent and pulse feeding of calcium peroxide. The specific method comprises the following steps: (1) Naturally settling primary sludge and excess sludge generated by an urban sewage treatment plant, removing supernatant, and concentrating to obtain a fermentation raw material; (2) Adding calcium peroxide into the obtained fermentation raw material, and performing anaerobic fermentation treatment to inhibit the generation of hydrogen sulfide. The sludge is fed in an intermittent and pulse mode, after the calcium peroxide is added, sulfate reducing bacteria are obviously influenced, and the activity of microbial enzymes is greatly inhibited, so that the generation of hydrogen sulfide in the anaerobic fermentation process of the sludge can be greatly inhibited. Through the rapid, efficient, low-investment and effective operation, the generation of toxic and harmful hydrogen sulfide gas in the anaerobic fermentation treatment of the sludge is reduced, and the method has important significance for the treatment and disposal of the sludge.
Description
Technical Field
The invention belongs to the technical field of environmental protection and sludge treatment recycling, and particularly relates to a method for reducing hydrogen sulfide generation in a sludge treatment process by intermittently and pulse adding calcium peroxide.
Technical Field
With the continuous acceleration of the urbanization process, the sewage treatment capacity of sewage treatment plants is increasing, and the output of excess sludge is also increasing. Because the sources of the sewage are varied, the sewage may contain various pollutants, and the substances finally enter a sewage treatment plant through a municipal pipe network, so that the residual sludge contains a large amount of pathogenic microorganisms, heavy metals and organic pollutants, and secondary pollution is easily caused to the environment due to improper treatment and disposal.
The treatment cost of the excess sludge is high, but the organic matters and nutrient substances in the excess sludge can be recycled by producing energy substances. Anaerobic fermentation is an effective treatment method for realizing harmlessness and recycling, can degrade biodegradable organic matters, stabilize and reduce excess sludge, kill pathogens, and can recover a large amount of short-chain fatty acids, hydrogen, methane and other products with high added values from the sludge, thereby achieving the effect of changing waste into valuable and having great effect on relieving the current energy crisis.
The anaerobic fermentation of the sludge can degrade organic matters to produce high value-added products and can also produce hydrogen sulfide gas. The odor emitted by the hydrogen sulfide pollutes the environment and can also cause certain harm to human bodies. Hydrogen sulfide is a highly toxic gas soluble in water, colorless, and smelly of a rotten egg, and is a strong irritant, suffocating neurotoxin. Odor can be smelled at very low concentration, more than 10ppm can produce partial symptom reaction, such as lacrimation, cough, nausea, vomit and the like, and the life of more than 300ppm of human body can be threatened. Due to the serious harm of hydrogen sulfide gas to health, the control research of hydrogen sulfide becomes one of important hot problems concerned by research institutions and the like. Therefore, it is necessary to find a method for inhibiting the production of hydrogen sulfide by anaerobic fermentation of sludge, which is simple, safe, cheap and efficient.
Calcium peroxide is used as peroxide with oxidizability and slow release, is widely applied to the fields of aquaculture, agriculture, medicine, water treatment and the like, and has the advantages of low price, strong oxidizing ability, safety, convenience in operation and use and the like. The sustained release type means that when calcium peroxide is dissolved in an aqueous medium, it is slowly decomposed into hydrogen peroxide, oxygen and calcium hydroxide. Based on this particular physicochemical characteristic, calcium peroxide has been used as an additive for sludge pretreatment. The calcium peroxide can effectively promote the breaking of sludge cells and increase the release of organic matters, so that the calcium peroxide is widely used for removing pollutants in sewage, dehydrating the sludge and producing volatile fatty acid and hydrogen through anaerobic fermentation, however, a method for reducing the generation of hydrogen sulfide in the sludge treatment process by using the calcium peroxide is not reported so far.
Disclosure of Invention
The invention aims to provide a method for inhibiting the anaerobic fermentation of sludge from generating hydrogen sulfide, namely, a mode of intermittently and pulse adding calcium peroxide is adopted to reduce the generation of hydrogen sulfide in the sludge treatment process. The method can effectively reduce the adding frequency of the medicines and save the medicine cost and the operation cost, thereby providing a control method for controlling the anaerobic fermentation of the sludge to produce the hydrogen sulfide, which is quick and efficient, has small investment and no potential risk to the environment.
In order to achieve the purpose, the technical method adopted by the invention comprises the following steps:
(1) And naturally settling primary sludge and excess sludge from the municipal sewage treatment plant. The settling time was 24 hours and the temperature was 4 ℃.
(2) Removing supernatant, and concentrating to obtain residual sludge with volatile solid content of 20-35g/L to obtain fermentation raw material.
(3) And (3) adding calcium peroxide into the sludge for mixing treatment, and fermenting in an anaerobic environment.
In the step (3), 3 times of equal-amount pulse type adding is adopted, the adding interval is 10-30 minutes, and the mode can obviously inhibit the generation of hydrogen sulfide by only changing the adding mode under the condition of not increasing the actual using amount, so that a better control effect is achieved.
(4) The fermented sludge is treated discontinuously by using calcium peroxide, the calcium peroxide is added into the reactor in a short period, and the sludge is treated in a short time by using the calcium peroxide again after 5 to 10 days. In fact, the inventors believe that the optimal time period for treating the sludge will depend on the specific operating parameters of the particular environment. The optimal period of treatment and rest can be readily determined by one skilled in the art by performing fairly straightforward experiments.
In the step (3), the total amount of the calcium peroxide is 0.05-0.25g/g VSS, preferably 0.1-0.15g/g VSS. The fermentation environment is anaerobic, that is, adding calcium peroxide into sludge, introducing nitrogen (nitrogen purity is 90.00-99.99%) for 5min to remove oxygen in the reactor, sealing, and placing the reactor into a shaking table at 35 deg.C and shaking speed of 125 rpm/min.
In the step (3), the anaerobic fermentation time of the sludge is 12 to 25 days.
In a preferred embodiment, the calcium peroxide is added in an amount of 0.1 to 0.15g/g VSS. Although the dosage of the calcium peroxide can inhibit the anaerobic fermentation of the sludge from generating the hydrogen sulfide within a certain range, and within a certain range, the inhibition effect on the anaerobic fermentation of the sludge from generating the hydrogen sulfide is more obvious along with the increase of the dosage of the calcium peroxide. However, in consideration of the relationship between the cost of raw materials and the yield of hydrogen sulfide, the amount of calcium peroxide used in the present invention is preferably in the range of 0.1 to 0.15g/g VSS.
When the calcium peroxide is added in the step-by-step pulse mode in the step (3), the adding interval time is preferably 10-20 minutes.
When the calcium peroxide is added in the step (4) in an intermittent manner, the adding interval is preferably 6-8 days.
Due to the adoption of the technical scheme, the invention has the following achievements:
1. the invention utilizes the advantages that the calcium peroxide reacts with water to generate hydrogen peroxide, calcium hydroxide and oxygen, and further generates active oxygen free radicals such as hydroxyl free radicals and the like to inhibit the anaerobic fermentation of the sludge to generate hydrogen sulfide. The method can obviously inhibit the abundance of sulfate reducing bacteria in the excess sludge, reduce the activity of related microbial enzymes, has important significance for realizing large-scale application of anaerobic fermentation of the sludge, and has positive influence on environmental protection.
2. Compared with the prior art, the invention can obviously reduce the generation of hydrogen sulfide in the sludge treatment process within extremely short action time, adopts an intermittent and pulse feeding mode, effectively reduces the feeding frequency of calcium peroxide, and saves the medicine cost and the operation cost.
3. The invention inhibits the generation of toxic and harmful substances of hydrogen sulfide in the anaerobic fermentation of the sludge, reduces the harm to the environment and even human bodies, can promote the safe and effective popularization of the anaerobic fermentation of the sludge, and has important significance for the reduction and the recycling of the sludge. The strategy of adding calcium peroxide for pretreatment has the advantages of environmental friendliness and environmental economy for practical application, and further expands the application field of calcium peroxide in engineering.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The present invention is further described with reference to specific embodiments, but the scope of the present invention is not limited thereto.
Example 1: influence of single simple addition of calcium peroxide on production of hydrogen sulfide
(1) Naturally settling sludge generated by an urban sewage treatment plant at 4 ℃ for 1 day in an organic glass container with the working volume of 4L, and removing supernatant to obtain the fermented raw material.
(2) Adding 500mL of the sludge obtained in the step (1) into a reactor, adding 0.1g/g VSS calcium peroxide, stirring uniformly, filling nitrogen into the reactor, keeping for 5min to remove oxygen, sealing the reactor, and placing the reactor into a shaking table for anaerobic fermentation, wherein the shaking table fermentation temperature is 35 +/-1 ℃, the shaking speed is 125rpm/min, the fermentation time (namely the residence time of the sludge in the reactor) is 13d, and the yield of hydrogen sulfide is 152.397 x 10 -4 mg/g VSS。
Example 2: influence of single simple addition of calcium peroxide on production of hydrogen sulfide
(1) Naturally settling sludge generated by an urban sewage treatment plant at 4 ℃ for 1d in an organic glass container with the working volume of 4L, and removing supernatant to obtain a fermented raw material.
(2) Adding 500mL of the sludge obtained in the step (1) into a reactor, adding 0.15g/g VSS calcium peroxide, stirring uniformly, filling nitrogen into the reactor, keeping for 5min to remove oxygen, sealing the reactor, and placing the reactor into a shaking table for anaerobic fermentation, wherein the shaking table fermentation temperature is 35 +/-1 ℃, the shaking speed is 125rpm/min, the fermentation time (namely the residence time of the sludge in the reactor) is 13d, and the yield of hydrogen sulfide is 90.5266 x 10 -4 mg/g VSS。
Example 3: influence of intermittent and pulse addition of calcium peroxide on generation of hydrogen sulfide
(1) Naturally settling sludge generated by an urban sewage treatment plant at 4 ℃ for 1d in an organic glass container with the working volume of 4L, and removing supernatant to obtain a fermented raw material.
(2) Adding 500mL of the sludge obtained in the step (1) into a reactor, adding 0.1g/g VSS calcium peroxide in an intermittent and pulse mode (the adding total amount is the same as that of the embodiment example (1), the adding intermittent time is 8 days, the pulse interval is 15 minutes), stirring uniformly, filling nitrogen into the reactor for 5 minutes to remove oxygen, sealing the reactor, and putting the reactor into a shaking table for anaerobic fermentation, wherein the shaking table fermentation temperature is 35 +/-1 ℃, the oscillation speed is 125rpm/min, the fermentation time (namely the retention time of the sludge in the reactor) is 13d, and the yield of hydrogen sulfide is 121.5547 x 10 -4 mg/g VSS。
Example 4: influence of intermittent and pulse calcium peroxide addition on hydrogen sulfide production
(1) Naturally settling sludge generated by an urban sewage treatment plant at 4 ℃ for 1d in an organic glass container with the working volume of 4L, and removing supernatant to obtain a fermented raw material.
(2) Adding 500mL of the sludge obtained in the step (1) into a reactor, adding 0.15g/g VSS calcium peroxide in an intermittent and pulse mode (the adding total amount is the same as that in the embodiment example (2), the adding intermittent time is 8 days, the pulse interval is 15 minutes), stirring uniformly, filling nitrogen into the reactor for 5 minutes to remove oxygen, sealing the reactor, and putting the reactor into a shaking table for anaerobic fermentation, wherein the shaking table fermentation temperature is 35 +/-1 ℃, the oscillation speed is 125rpm/min, the fermentation time (namely the retention time of the sludge in the reactor) is 13d, and the yield of hydrogen sulfide is 71.0537 x 10 -4 mg/g VSS。
Comparative example 1
(1) Naturally settling sludge generated by an urban sewage treatment plant at 4 ℃ for 1d in an organic glass container with the working volume of 4L, and removing supernatant to obtain a fermented raw material.
(2) Adding 500mL of the sludge obtained in the step (1) into a reactor, adding no calcium peroxide, uniformly stirring, and feeding into the reactorIntroducing nitrogen gas, maintaining for 5min to remove oxygen, sealing the reactor, and performing anaerobic fermentation in a shaking table at 35 + -1 deg.C under shaking speed of 125rpm/min for 13d, wherein the yield of hydrogen sulfide is 309.0909 × 10 -4 mg/g VSS。
The hydrogen yields of the examples and comparative examples are shown in table 1:
TABLE 1 fermentation comparison of examples and comparative examples
As can be seen from the table, the hydrogen sulfide production of examples 1 to 4 was greatly reduced from that of comparative example 1, and particularly, the hydrogen sulfide production of examples 2 and 4, which were intermittently and pulsatingly added under optimum conditions, was most reduced from that of comparative example 1.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many modifications to the invention, which are possible or equivalent variations, without departing from the spirit and scope of the invention. Therefore, it is intended to cover any and all such modifications and changes as fall within the true scope of the invention.
Claims (5)
1. A method for reducing hydrogen sulfide generation in a sludge treatment process is characterized by mainly comprising the following steps:
the method reduces the problem of hydrogen sulfide generation by anaerobic fermentation by adding calcium peroxide with the concentration of 0.05-0.25g/g VSS into the sludge; the calcium peroxide is added into the sludge in an intermittent and pulse adding mode, the adding interval is 10-30 minutes, the sludge is treated discontinuously by the calcium peroxide for 5-10 days, and then the residual sludge is treated in a short time by the calcium peroxide again.
2. The method of claim 1 for reducing hydrogen sulfide production during sludge treatment, wherein: the concentration of calcium peroxide is in the range of 0.05-0.25g/g VSS, preferably 0.1-0.15g/g VSS.
3. The method of claim 1 for reducing hydrogen sulfide production during sludge treatment, wherein: the calcium peroxide is added in an intermittent and pulse manner.
4. The method of claim 1 for reducing hydrogen sulfide production during sludge treatment, wherein: when the calcium peroxide is added in a step-by-step pulse mode, 3 steps of equal addition are preferably adopted, and the optimal addition interval is 10-20 minutes.
5. The method of claim 1 for reducing hydrogen sulfide production during sludge treatment, wherein: when the calcium peroxide is added in an intermittent mode, the interval time of the intermediate addition is preferably 6-8 days.
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| CN202211524284.5A CN115893784A (en) | 2022-12-01 | 2022-12-01 | Method for reducing hydrogen sulfide generation in sludge treatment process |
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| CN202211524284.5A CN115893784A (en) | 2022-12-01 | 2022-12-01 | Method for reducing hydrogen sulfide generation in sludge treatment process |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4620928A (en) * | 1983-09-29 | 1986-11-04 | Wasserverband Raumschaft Lahr | Process for reducing the hydrogen sulfide content in anaerobic decomposition processes, especially in sludge digestion processes |
| JP2006087970A (en) * | 2004-09-21 | 2006-04-06 | Toshinari Iruma | Odor reduction method in concentration tank of water purification facilities |
| CN107445279A (en) * | 2017-07-21 | 2017-12-08 | 西安建筑科技大学 | Calper calcium peroxide is used to control the loss of landscape water body foul smell and the application of bed mud sediment upturning |
| CN110204160A (en) * | 2019-05-30 | 2019-09-06 | 湖南大学 | A method of inhibit sludge anaerobic fermentation to generate hydrogen sulfide |
| CN112661375A (en) * | 2020-12-23 | 2021-04-16 | 福州大学 | Method for deodorizing sludge through catalytic oxidation of hydroxyl radicals, deodorized sludge and application |
| CN115159690A (en) * | 2022-06-23 | 2022-10-11 | 浙江大学 | Method for controlling sewage odor by using nitrate and calcium peroxide together |
-
2022
- 2022-12-01 CN CN202211524284.5A patent/CN115893784A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4620928A (en) * | 1983-09-29 | 1986-11-04 | Wasserverband Raumschaft Lahr | Process for reducing the hydrogen sulfide content in anaerobic decomposition processes, especially in sludge digestion processes |
| JP2006087970A (en) * | 2004-09-21 | 2006-04-06 | Toshinari Iruma | Odor reduction method in concentration tank of water purification facilities |
| CN107445279A (en) * | 2017-07-21 | 2017-12-08 | 西安建筑科技大学 | Calper calcium peroxide is used to control the loss of landscape water body foul smell and the application of bed mud sediment upturning |
| CN110204160A (en) * | 2019-05-30 | 2019-09-06 | 湖南大学 | A method of inhibit sludge anaerobic fermentation to generate hydrogen sulfide |
| CN112661375A (en) * | 2020-12-23 | 2021-04-16 | 福州大学 | Method for deodorizing sludge through catalytic oxidation of hydroxyl radicals, deodorized sludge and application |
| CN115159690A (en) * | 2022-06-23 | 2022-10-11 | 浙江大学 | Method for controlling sewage odor by using nitrate and calcium peroxide together |
Non-Patent Citations (1)
| Title |
|---|
| 朱书景等: "《固体废物处理与资源化》", vol. 1, 30 June 2022, 武汉大学出版社, pages: 71 * |
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