CN116854232A - Control method and equipment for hydrogen sulfide and methane in sewage pipe network - Google Patents
Control method and equipment for hydrogen sulfide and methane in sewage pipe network Download PDFInfo
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- CN116854232A CN116854232A CN202311129069.XA CN202311129069A CN116854232A CN 116854232 A CN116854232 A CN 116854232A CN 202311129069 A CN202311129069 A CN 202311129069A CN 116854232 A CN116854232 A CN 116854232A
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- Prior art keywords
- pipe network
- sewage pipe
- sulfide
- methane
- sewage
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- 239000010865 sewage Substances 0.000 title claims abstract description 131
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 42
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 30
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 56
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 49
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims abstract description 48
- 229910052742 iron Inorganic materials 0.000 claims abstract description 38
- -1 iron ions Chemical class 0.000 claims abstract description 33
- 239000002245 particle Substances 0.000 claims abstract description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000001301 oxygen Substances 0.000 claims abstract description 30
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 30
- 150000004763 sulfides Chemical class 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 15
- 239000013049 sediment Substances 0.000 claims abstract description 11
- 241000894006 Bacteria Species 0.000 claims abstract description 9
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 7
- 230000001590 oxidative effect Effects 0.000 claims abstract description 7
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 4
- 238000005273 aeration Methods 0.000 claims description 33
- 238000001514 detection method Methods 0.000 claims description 18
- 150000002978 peroxides Chemical class 0.000 claims description 15
- 239000012159 carrier gas Substances 0.000 claims description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- 239000010802 sludge Substances 0.000 claims description 6
- 239000004343 Calcium peroxide Substances 0.000 claims description 5
- LHJQIRIGXXHNLA-UHFFFAOYSA-N calcium peroxide Chemical compound [Ca+2].[O-][O-] LHJQIRIGXXHNLA-UHFFFAOYSA-N 0.000 claims description 5
- 235000019402 calcium peroxide Nutrition 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- SPAGIJMPHSUYSE-UHFFFAOYSA-N Magnesium peroxide Chemical compound [Mg+2].[O-][O-] SPAGIJMPHSUYSE-UHFFFAOYSA-N 0.000 claims description 3
- 159000000014 iron salts Chemical class 0.000 claims description 3
- 229960004995 magnesium peroxide Drugs 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 abstract description 9
- 239000002105 nanoparticle Substances 0.000 description 15
- 230000001276 controlling effect Effects 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 244000005700 microbiome Species 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 230000003647 oxidation Effects 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 5
- 150000002505 iron Chemical class 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 3
- 231100000572 poisoning Toxicity 0.000 description 3
- 230000000607 poisoning effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000013543 active substance Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229960002089 ferrous chloride Drugs 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229910001447 ferric ion Inorganic materials 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/345—Biological treatment of water, waste water, or sewage characterised by the microorganisms used for biological oxidation or reduction of sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2307/00—Location of water treatment or water treatment device
- C02F2307/08—Treatment of wastewater in the sewer, e.g. to reduce grease, odour
-
- 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
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Microbiology (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The application relates to the technical field of sewage pipe network management, in particular to a method and equipment for controlling hydrogen sulfide and methane in a sewage pipe network. The control method of hydrogen sulfide and methane in the sewage pipe network comprises the following steps: adding iron ions into a sewage pipe network generated by sulfides and methane to form ferrous sulfide particles on the surface of sediment in the sewage pipe network; aerating the sewage pipe network formed with the ferrous sulfide particles by adopting oxygen-containing gas, and enabling the ferrous sulfide particles to react with dissolved oxygen to form hydroxyl free radicals; oxidizing sulfides in the sewage pipe network by utilizing hydroxyl radicals and inhibiting activities of sulfate reducing bacteria and methanogens in the sewage pipe network. The control method of hydrogen sulfide and methane in the sewage pipe network provided by the application can reduce the generation of sulfide in situ.
Description
Technical Field
The application relates to the technical field of sewage pipe network management, in particular to a method and equipment for controlling hydrogen sulfide and methane in a sewage pipe network.
Background
Sewer pipes are one of the important infrastructures in modern cities. However, over time, sewage networks can produce large amounts of sediment, initiating a complex series of biochemical reactions. Wherein sulfate is produced by Sulfate Reducing Bacteria (SRB)The problem of reduction to sulphide has been the focus of attention. For example, high concentration hydrogen sulfide (H) 2 S) can cause the problems of pipe network corrosion, stink and human poisoning, greatly shortens the service life of the sewage pipe network, and causes serious health risks.
Disclosure of Invention
Based on this, it is necessary to provide a control method and apparatus for hydrogen sulfide and methane in sewage pipe networks that can reduce the production of sulfide and methane.
In a first aspect, the application provides a method for controlling hydrogen sulfide and methane in a sewage pipe network, comprising the following steps:
adding iron ions into a sewage pipe network generated by sulfides and methane to form ferrous sulfide particles on the surface of sediment in the sewage pipe network;
aerating the sewage pipe network formed with the ferrous sulfide particles by adopting oxygen-containing gas, and enabling the ferrous sulfide particles to react with dissolved oxygen to form hydroxyl free radicals; oxidizing sulfides in the sewage pipe network by utilizing the hydroxyl radicals and inhibiting activities of sulfate reducing bacteria and methanogens in the sewage pipe network.
In some embodiments, at the aeration, further comprising the step of adding peroxide to the sewage network in which the ferrous sulfide particles are formed;
the peroxide comprises one or more of calcium peroxide, hydrogen peroxide and magnesium peroxide;
and according to the content of the sulfide, adding 0.5 mg-1 mg of the peroxide into the sewage pipe network containing 1mg of sulfide.
In some embodiments, 0.1mg to 0.2mg of the iron ion is added to the deposit per 1mg of sulfide content.
In some embodiments, the concentration of the ferrous sulfide particles is 0.5g/L to 2g/L.
In some embodiments, the iron ions are administered intermittently at a frequency of 1 time per week.
In some embodiments, the aeration mode is intermittent aeration, the frequency of intermittent aeration is 1 time/hour, and the time of each aeration is 5 min-15 min.
In some embodiments, the iron ions include Fe 3+ And/or Fe 2+ ；
The material providing the iron ions comprises iron salts and/or iron-containing sludge.
In a second aspect, the present application provides an apparatus for controlling the production of hydrogen sulfide and methane from a sewage network, comprising:
the first feeding system comprises a first carrying device and a first pipeline connected with the first carrying device, and is used for feeding iron ions into a sewage pipe network;
the aeration system comprises a carrier gas device and a second pipeline connected with the carrier gas device, and is used for providing oxygen-containing gas into a sewage pipe network.
In some embodiments, the apparatus further comprises a first valve, a second valve, and a detection system;
the first valve is arranged on the first pipeline, and the second valve is arranged on the second pipeline;
the device also comprises a detection system, wherein the detection system comprises detection equipment and an electrode connected with the detection equipment, and the detection system is used for detecting the concentration of sulfide in the sewage pipe network to be detected.
In some embodiments, the apparatus further comprises a second feeding system comprising a second loading device and a third pipeline connected to the second loading device, the second feeding system being for feeding peroxide into a sewage pipe network;
and a third valve is arranged on the third pipeline.
According to the control method for hydrogen sulfide and methane in the sewage pipe network, iron ions are added into the sewage pipe network, and the iron ions can react with sulfides in the sewage pipe network to form ferrous sulfide precipitates; aeration can improve the dissolved oxygen in the sewage pipe networkFerrous sulfide (FeS) can form hydroxyl radical in situ on the surface of the sewage pipe network through catalytic oxygen). On one hand, the hydroxyl radical can improve the sulfide oxidation efficiency of the interface of the water and sewage pipe network, thereby reducing the concentration of sulfide in sewage; meanwhile, the method can oxidize various pollutants in the sewage pipe network, and an active substance inhibition layer is formed on the surface of the sewage pipe network, so that the formation of sulfides can be avoided from the source; on the other hand, the hydroxyl free radicals can also change the activities and community structures of microorganisms, and increase the relative abundance of Sulfide Oxidizing Bacteria (SOB) on the surface layer of the sewage pipe network to synchronously promote the oxidization of sulfide by the microorganisms, so that the in-situ reduction of sulfide yield in the sewage pipe network is realized. The method can realize long-term and high-efficiency control of sulfide in the sewage pipe network, and avoid corrosion of sulfide to the sewage pipe network pipeline and formation of toxic and harmful gas (methane).
In addition, the control method of hydrogen sulfide and methane in the sewage pipe network provided by the application has the characteristics of low cost, convenience in operation and environmental friendliness.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a method for controlling hydrogen sulfide and methane in a sewage network according to one embodiment;
FIG. 2 is a schematic diagram of a control device for hydrogen sulfide and methane in a sewage network according to an embodiment;
FIG. 3 is a graph showing the sulfide content over time in the method for controlling hydrogen sulfide and methane in sewage pipes according to example 1 and comparative examples 1 and 2;
fig. 4 is a graph showing the concentration of hydroxyl radicals over time in the control methods of hydrogen sulfide and methane in sewage pipes in examples 1 to 3 and comparative example 2.
Reference numerals illustrate: 100. a first feeding system; 101. a first loading device; 102. a first pipe; 103. a first valve; 200. an aeration device; 201. a carrier gas device; 202. a second pipe; 203. a second valve; 300. a detection system; 301. a detection device; 302. an electrode; 400. a second feeding system; 401. a second loading device; 402. a third conduit; 403. and a third valve.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Terminology:
the term "and/or" as used herein includes the scope of selection of any one of two or more of the items listed in relation to each other and also includes any and all combinations of the items listed in relation to each other, including any two of the items listed in relation to each other, any more of the items listed in relation to each other, or all combinations of the items listed in relation to each other. For example, "a and/or B" includes A, B and "a and B in combination" three parallel schemes.
In this document, unless otherwise indicated, "one or more" means any one of the listed items or any combination of the listed items. Similarly, "one or more" and the like are otherwise indicated for the case of "one or more", and the same is understood unless otherwise indicated.
Herein, "further," "still further," "special," "such as," "for example," "illustrated," etc. are used for descriptive purposes to indicate that there is a relationship between the various claims that follow and that they cover, but are not to be construed as limiting the prior art nor as limiting the scope of protection herein. In this context, a (e.g., B), where B is one non-limiting example of a, is understood not to be limited to B, unless otherwise stated.
Herein, "optional" refers to the presence or absence of the possibility, i.e., to any one of the two juxtaposed schemes selected from "with" or "without". If multiple "alternatives" occur in a technical solution, if no particular description exists and there is no contradiction or mutual constraint, then each "alternative" is independent. In the present application, "optionally containing", and the like are described, meaning "containing or not containing". "optional component X" means that component X is present or absent, or that component X is present or absent.
Herein, in the "first aspect", "second aspect", "third aspect", "fourth aspect", etc., the terms "first", "second", "third", "fourth", etc. are used for descriptive purposes only, and are not to be construed as indicating or implying a relative importance or quantity, nor are they to be construed as implying an importance or quantity of the indicated technical features. Moreover, the terms "first," "second," "third," "fourth," and the like are used for non-exhaustive list description purposes only, and are not to be construed as limiting the number of closed forms.
In this context, the technical features described in open form include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.
Herein, reference is made to a value interval (i.e., a range of values), where the distribution of the values selected within the value interval is considered continuous, and includes two value endpoints (i.e., a minimum value and a maximum value) of the value interval, and each value between the two value endpoints, unless otherwise indicated. When a numerical range merely points to integers within the numerical range, unless expressly stated otherwise, both endpoints of the numerical range are inclusive of the integer between the two endpoints, and each integer between the two endpoints is equivalent to the integer directly recited. When multiple numerical ranges are provided to describe a feature or characteristic, the numerical ranges may be combined. In other words, unless otherwise indicated, the numerical ranges disclosed herein are to be understood as including any and all subranges subsumed therein. The "numerical value" in the numerical interval may be any quantitative value, such as a number, a percentage, a proportion, or the like. "numerical intervals" allows for the broad inclusion of numerical interval types such as percentage intervals, proportion intervals, ratio intervals, and the like.
In this document, a plurality of steps are referred to in a method flow, and unless explicitly stated differently herein, the steps are not strictly limited to the order of execution, which may be performed in other orders than as described. Moreover, any step may comprise a plurality of sub-steps or phases, which are not necessarily performed at the same time, but may be performed at different times, the order of their execution is not necessarily sequential, but may be performed in turn or alternately or simultaneously with other steps or sub-steps or portions of phases of other steps.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms herein above will be understood by those of ordinary skill in the art as the case may be.
The term "sludge" refers to a precipitate formed or discharged by a sewage treatment device, which belongs to a hydrophilic substance of a gelatinous structure; the main component is organic matter, and has the characteristic of easy decomposition and stink.
There are large amounts of sulfate and microorganisms (sulfate reducing bacteria) in the sludge, resulting in the production of high concentrations of sulfide (H 2 S), thus causing corrosion of the mesh tube and causing malodor and poisoning of the human body. Therefore, there is a need to provide a method for controlling hydrogen sulfide and methane in sewage networks to reduce sulfides, especially H 2 S is formed, so that the service life of the sewage pipe network is prolonged, and the problems of malodor and human poisoning are avoided.
Referring to fig. 1, in a first aspect, the present application provides a method for controlling hydrogen sulfide and methane in a sewage pipe network, which includes steps S100 to S200.
According to the control method for hydrogen sulfide and methane in the sewage pipe network, iron ions are added into the sewage pipe network, and the iron ions can react with sulfides in the sewage pipe network to form ferrous sulfide precipitates; aeration can increase the concentration of dissolved oxygen in a sewage pipe network, and ferrous sulfide (FeS) can form hydroxyl radicals on the surface of the sewage pipe network in situ through catalytic oxygen). On one hand, the hydroxyl radical can improve the sulfide oxidation efficiency of the interface of the water and sewage pipe network, thereby reducing the concentration of sulfide in sewage; meanwhile, the method can oxidize various pollutants in the sewage pipe network, and an active substance inhibition layer is formed on the surface of the sewage pipe network, so that the formation of sulfides can be avoided from the source; on the other hand, the hydroxyl free radicals can also change the activities and community structures of microorganisms, and increase the relative abundance of Sulfide Oxidizing Bacteria (SOB) on the surface layer of the sewage pipe network to synchronously promote the oxidation of the microorganisms to sulfides, so that the in-situ reduction of sulfide yield in the sewage pipe network is realized. The method can realize long-term and high-efficiency control of sulfide in the sewage pipe network, and avoid corrosion of sulfide to the sewage pipe network pipeline and formation of toxic and harmful gas (methane).
In addition, the control method of hydrogen sulfide and methane in the sewage pipe network provided by the application has the characteristics of low cost, convenience in operation and environmental friendliness.
Step S100: ferrous sulfide particles are formed on the surface of sediment in a sewage pipe network.
Iron ions are added into a sewage pipe network generated by sulfides and methane so as to form ferrous sulfide particles on the surface of sediment in the sewage pipe network.
It is understood that the iron ion may be Fe 3+ And/or Fe 2+ The method comprises the steps of carrying out a first treatment on the surface of the The material providing the iron ions comprises iron salts and/or iron-containing sludge. Wherein the iron salt comprises a soluble iron salt and/or iron salt nanoparticles, the soluble iron salt comprising one or more of, but not limited to, ferric sulfate, ferrous sulfate, ferric nitrate, ferrous nitrate, ferric chloride, and ferrous chloride; the iron salt nanoparticles include ferrous sulfide (FeS) nanoparticles. Preferably, the substance providing iron ions is FeS nanoparticles. The FeS nano particles are selected to realize cyclic utilization, namely, after the FeS nano particles are added, iron ions react with sulfide generated by SRB in the sewage pipe network to form FeS nano particles again, and the reformed FeS nano particles can provide iron ions, so that the control of the sulfide in the sewage pipe network can be realized without continuously adding a large amount of chemical agents.
In some embodiments, 0.1mg to 0.2mg of iron ion is added to each deposit containing 1mg of sulfide, based on the sulfide content. The addition amount of iron ions is controlled within the above range, and the problem of cost increase caused by excessive iron ions can be avoided on the basis of significantly removing sulfides (at least more than 75% of sulfides can be removed).
Furthermore, in order to reduce the cost, the iron ions are added intermittently, and the frequency of intermittent addition is quantitatively supplemented according to the loss rate of FeS particles caused by sewage flushing, so that the surface of the sediment is kept at the stable concentration of the FeS particles. It will be appreciated that the rate of loss can be measured by the iron content of the deposit surface per unit time. In the application, the loss rate of FeS particles is less than or equal to 1m/s, preferably 0.3m/s to 0.5m/s. It should be noted that, under the condition that sewage flows at a very low flow rate or does not flow, feS particles basically cannot run off, and after a certain amount of FeS nano particles are added, continuous formation of hydroxyl radicals can be realized.
In some embodiments, the intermittent dosing is at a frequency of 1 per week.
In some embodiments, the concentration of ferrous sulfide particles is 0.5g/L to 2g/L, e.g., 0.6g/L, 0.7g/L, 0.8g/L, 0.9g/L, 1g/L, 1.1g/L, 1.2g/L, 1.3g/L, 1.4g/L, 1.5g/L, 1.6g/L, 1.7g/L, 1.8g/L, 1.9g/L. The content of the formed hydroxyl radical can be regulated and controlled by regulating and controlling the concentration of ferrous sulfide particles. Controlling the concentration of ferrous sulfide particles within the above-described range ensures that a sufficient amount of hydroxyl radicals are formed for sulfide removal.
The sewage is mainly generated by domestic water drainage. Which is typically present in low flow, low ramp pipes. Therefore, the method for controlling the generation of hydrogen sulfide and methane in the sewage pipe network is particularly suitable for the sewage pipe in the environment.
Step S200: preparing hydroxyl radicals.
Aerating the sewage pipe network formed with the ferrous sulfide particles by adopting oxygen-containing gas, and enabling the ferrous sulfide particles to react with dissolved oxygen to form hydroxyl free radicals; oxidizing sulfides in the sewage pipe network by utilizing the hydroxyl radicals and inhibiting activities of sulfate reducing bacteria and methanogens in the sewage pipe network.
"aeration" refers to the process of forcing oxygen in a gas to transfer into a sewer network to obtain sufficient dissolved oxygen. In addition, aeration can also prevent suspended bodies in the sewage pipe network from sinking, strengthen contact between organic pollutants and microorganisms and dissolved oxygen, and ensure that the microorganisms have oxidative decomposition effect on the organic pollutants in the sewage pipe network under the condition of sufficient dissolved oxygen.
In some embodiments, the method further comprises the step of adding peroxide to the sewage network formed with the ferrous sulfide particles during aeration. The release of the oxygen-containing gas can be further promoted by adding peroxide, and the concentration of dissolved oxygen is increased.
In some embodiments, the oxygen-containing gas comprises oxygen and/or air. Wherein the concentration of oxygen is more than or equal to 20 percent.
In some embodiments, the peroxide comprises one or more of calcium peroxide, hydrogen peroxide, and magnesium peroxide.
In some embodiments, 0.5mg to 1mg peroxide is added to each deposit containing 1mg sulfide, based on the sulfide content.
In order to avoid energy consumption output of continuous oxygen supply. In the application, the aeration mode is intermittent aeration, and aeration is performed when a sewage pipe network is specifically selected to generate the highest sulfide concentration value. In some embodiments, the frequency of intermittent aeration is 1 time per hour, and the time of each aeration is 5 min-15 min.
Referring to fig. 2, in a second aspect, the present application provides a control device for hydrogen sulfide and methane in a sewage pipe network, including:
the first feeding system 100, the first feeding system 100 comprises a first carrying device 101 and a first pipeline 102 connected with the first carrying device 101, and the first feeding system 100 is used for feeding iron ions into a sewage pipe network;
aeration system 200 the aeration system 200 comprises a carrier gas device 201 and a second pipeline 202 connected to the carrier gas device 201, the aeration system 200 is used for providing oxygen-containing gas into the sewage pipe network.
The working principle of the control equipment for hydrogen sulfide and methane in the sewage pipe network and the realized effect can be as follows:
the first feeding system is used for feeding iron ions to the surface layer of the sewage pipe network, a layer of FeS particles is formed on the surface of the iron ions, the aeration system is used for introducing oxygen-containing gas into the sewage pipe network, the FeS particles are contacted with oxygen, and the FeS particles are excited to generate hydroxyl free radicals in situ. On one hand, hydroxyl radicals generated in situ and sulfide oxidation efficiency of a sewage pipe network interface are reduced, so that the concentration of sulfide in sewage is reduced; further synchronously promoting the oxidation of microorganisms to sulfides by increasing the relative abundance of Sulfide Oxidizing Bacteria (SOB) on the surface layer of the sewage pipe network; on the other hand, the sulfur production activity of the surface layer of the sewage pipe network is obviously reduced by FeS oxidation, the in-situ reduction of the yield of sulfide in the sewage pipe network is realized, and the purposes of controlling the generation of sulfide in sewage and realizing the optimized operation management of the sewage pipe network are further achieved.
The first feeding system can carry out iron ion replenishment according to the loss rate of FeS particles, so that the surface of the sediment can keep FeS particles with a certain concentration.
In some embodiments, the apparatus further comprises a first valve 103, a second valve 203, and a third valve 403; the first valve 103 is disposed on the first conduit 102, the second valve 203 is disposed on the second conduit 202, and the third valve 403 is disposed on the third conduit 402.
In the present application, the first material loading device is not limited, and any well-known container for containing ferric salt and/or iron-containing sludge may be selected, and as an exemplary illustration, the first material loading device may be a tank.
In some embodiments, the apparatus further comprises a detection system 300, wherein the detection system 300 is used for in situ detection of sulfide concentration in the sewage network to be tested. The detection system 300 includes a sulfide detection device 301 and an electrode 302 coupled to the sulfide detection device.
In some embodiments, the apparatus further comprises a second feeding system 400, the second feeding system 400 comprising a second loading device 401 and a third pipe 402 connected to the second loading device 401, the second feeding system 400 being for feeding peroxide into the sewage pipe network.
In some embodiments, third valve 403 is provided on third conduit 402.
In the present application, the first valve, the second valve and the third valve are all automatic valves. The automatic valve is arranged on the pipeline to realize automatic regulation and control, so that iron ions and peroxide can be intermittently added, intermittent aeration can be realized, excessive energy consumption can be avoided, and the cost is reduced.
In some embodiments, the first, second and third pipelines are each provided with a pump for delivering ferric ions, peroxide and oxygen-containing gas into the sewage network to be treated.
In some embodiments, the pipeline in which the sewage pipe network is located has a drop structure. The existence of a drop structure often leads to the formation of a sewage pipe network, malodor appears, and the sewage pipe network needs to be treated; in addition, the drop structure can obviously increase the oxygen content in the sewage pipe network, thereby reducing the aeration rate and the capacity consumption.
The present application will be described in further detail with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The experimental methods in the following examples, in which specific conditions are not noted, are preferably referred to the guidelines given in the present application, and may be according to the experimental manual or conventional conditions in the art, the conditions suggested by the manufacturer, or the experimental methods known in the art.
In the specific examples described below, the measurement parameters relating to the raw material components, unless otherwise specified, may have fine deviations within the accuracy of weighing. Temperature and time parameters are involved, allowing acceptable deviations from instrument testing accuracy or operational accuracy.
Example 1
The control equipment for hydrogen sulfide and methane in the sewage pipe network used in this embodiment is shown in fig. 2. The control method of hydrogen sulfide and methane in the sewage pipe network comprises the following steps:
the ends of the first and second pipes were fed into a sewage network containing 10mg sulphide. Under the regulation and control of the first valve and the second valve, feS nano particles are intermittently added to form FeS particle sediment with the concentration of 2g/L on the surface of the sediment; and intermittently introducing air into the sewage pipe network through the aeration system. Wherein, the frequency of FeS nano particles is 1 time/week; the frequency of intermittent air ventilation is 1 time/hour, and the time of each aeration is 10 minutes.
Optionally, during aeration, calcium peroxide can be added through a third pipeline, and the content of the calcium peroxide in the sewage pipe network is 20mg/L.
As can be seen from FIG. 3, after 60min of treatment in this example, the sulfide content in the sewage network is significantly reduced, and the sulfide removal amount can be as high as 11.4mg S/L. As can be seen from fig. 4, after 180min of treatment in this example, the concentration of hydroxyl radicals on the surface of the deposit gradually increased over time; at 180min, the concentration of the hydroxyl radical can reach 37.8+/-0.7 mu M.
Example 2
The process of example 2 is essentially the same as that of example 1, except that: feS particles precipitate at a concentration of 1g/L formed on the surface of the deposit. Wherein, the frequency of FeS nano-particles is 1 time/week.
As can be seen from fig. 4, after 180min of treatment in this example, the concentration of hydroxyl radicals on the surface of the deposit gradually increased over time; at 180min, the concentration of hydroxyl radicals can reach 27.4 [ mu ] M+/-4.3 [ mu ] M.
Example 3
The process of example 3 is essentially the same as that of example 1, except that: feS particles precipitate at a concentration of 0.5g/L formed on the surface of the deposit. Wherein, the frequency of FeS nano-particles is 1 time/week.
As can be seen from fig. 4, after 180min of treatment in this example, the concentration of hydroxyl radicals on the surface of the deposit gradually increased with time; at 180min, the concentration of hydroxyl radicals can reach 18.6mu.M+/-1.3 mu.M.
From examples 1 to 3, it is understood that the amount of hydroxyl radicals generated is closely related to the concentration of the FeS pellet formed, and that the amount of hydroxyl radicals generated increases as the concentration of FeS pellet increases.
Examples 4 to 6
The methods of examples 4-6 are substantially the same as the preparation methods of examples 1-3, except that: ferrous chloride is used to replace FeS nanoparticles. The test results of examples 4-6 are similar to those of examples 1-3, and are not repeated here.
Comparative example 1
The control method of hydrogen sulfide and methane in the sewage pipe network adopted in comparative example 1 is basically the same as that in example 1, except that: feS nano particles are added into the sewage pipe network only through the first feeding system. As shown in FIG. 3, after the treatment of this comparative example for 60min, the sulfide content in the sewage pipe network was unchanged.
Comparative example 2
The control method of hydrogen sulfide and methane in the sewage pipe network adopted in comparative example 2 is basically the same as that in example 1, except that: air is injected into the sewage pipe network only through the aeration system. As shown in FIG. 3, after 60min of treatment, the sulfide content in the sewage pipe network is reduced, but the reduction is not obvious, and the sulfide content is basically unchanged after 30min of treatment. As can be seen from FIG. 4, no hydroxyl radicals were formed after 180min of treatment in this comparative example.
As can be seen from FIG. 3, the treatment method of example 1 can achieve a sulfide removal of 11.4mg S/L in the sewage network after 60 min; the treatment method of comparative example 1 only can enable the sulfide removal amount in the sewage pipe network to reach 6mg S/L after 60min, and compared with comparative example 1, the sulfide removal amount is reduced by 5.4mg S/L. Therefore, the control method of hydrogen sulfide and methane in the sewage pipe network provided by the application can obviously improve the oxidation efficiency of sulfide under the action of iron ions and oxygen-containing gas, can avoid the generation of sulfide and methane from the source, and can obviously remove sulfide generated in the sewage pipe network.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. The scope of the application is therefore intended to be covered by the appended claims, and the description and drawings should be construed in view of the scope of the appended claims.
Claims (10)
1. The control method of hydrogen sulfide and methane in the sewage pipe network is characterized by comprising the following steps:
adding iron ions into a sewage pipe network generated by sulfides and methane to form ferrous sulfide particles on the surface of sediment in the sewage pipe network;
aerating the sewage pipe network formed with the ferrous sulfide particles by adopting oxygen-containing gas to enable the ferrous sulfide particles to react with dissolved oxygen to form hydroxyl free radicals; oxidizing sulfides in the sewage pipe network by utilizing the hydroxyl radicals and inhibiting activities of sulfate reducing bacteria and methanogens in the sewage pipe network.
2. The method of claim 1, further comprising the step of adding peroxide to said sewage network in which said ferrous sulfide particles are formed during said aeration;
the peroxide comprises one or more of calcium peroxide, hydrogen peroxide and magnesium peroxide;
and adding 0.5 to 1mg of the peroxide into each sediment containing 1mg of sulfide according to the content of sulfide.
3. The method of claim 1, wherein 0.1mg to 0.2mg of said iron ions are added to said sewage network containing 1mg of sulfide per one sulfide content.
4. The method of claim 1, wherein the concentration of the ferrous sulfide particles is 0.5g/L to 2g/L.
5. The method of any one of claims 1 to 4, wherein the iron ions are administered intermittently at a frequency of 1 time/week.
6. The method according to any one of claims 1 to 4, wherein the aeration mode is intermittent aeration, the frequency of intermittent aeration is 1 time/hour, and the time of each aeration is 5min to 15min.
7. The method of any one of claims 1-4Characterized in that the iron ions comprise Fe 3+ And/or Fe 2+ ；
The material providing the iron ions comprises iron salts and/or iron-containing sludge.
8. A control device for hydrogen sulfide and methane in a sewage pipe network, comprising:
the first feeding system comprises a first carrying device and a first pipeline connected with the first carrying device, and is used for feeding iron ions into a sewage pipe network;
the aeration system comprises a carrier gas device and a second pipeline connected with the carrier gas device, and is used for providing oxygen-containing gas into a sewage pipe network.
9. The apparatus of claim 8, further comprising a first valve, a second valve, and a detection system;
the first valve is arranged on the first pipeline, and the second valve is arranged on the second pipeline;
the detection system comprises detection equipment and electrodes connected with the detection equipment, and is used for detecting the concentration of sulfide in the sewage pipe network to be detected.
10. The apparatus of claim 8 or 9, further comprising a second feeding system comprising a second loading device and a third pipe connected to the second loading device, the second feeding system being configured to feed peroxide into a sewage pipe network;
and a third valve is arranged on the third pipeline.
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