CN108975461B - Device and method for degassing hydrogen sulfide gas in drainage pipe network - Google Patents
Device and method for degassing hydrogen sulfide gas in drainage pipe network Download PDFInfo
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- CN108975461B CN108975461B CN201810810739.7A CN201810810739A CN108975461B CN 108975461 B CN108975461 B CN 108975461B CN 201810810739 A CN201810810739 A CN 201810810739A CN 108975461 B CN108975461 B CN 108975461B
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- hydrogen sulfide
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- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 91
- 239000007789 gas Substances 0.000 title claims abstract description 75
- 238000007872 degassing Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000945 filler Substances 0.000 claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 claims abstract description 12
- -1 iron ions Chemical class 0.000 claims abstract description 11
- 239000010865 sewage Substances 0.000 claims description 39
- 238000007689 inspection Methods 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000012546 transfer Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004880 explosion Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 11
- 150000002505 iron Chemical class 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000003487 electrochemical reaction Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- VGPSUIRIPDYGFV-UHFFFAOYSA-N [N].O[N+]([O-])=O Chemical compound [N].O[N+]([O-])=O VGPSUIRIPDYGFV-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000007954 hypoxia Effects 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/4618—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/4618—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water
- C02F2001/4619—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water only cathodic or alkaline water, e.g. for reducing
-
- 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
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Physical Water Treatments (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention provides a drainage pipe network hydrogen sulfide gas removing device which comprises a supporting foot, a side plate, a cross rod and an impeller, wherein the side plate is arranged on the supporting foot; the impeller 4 is made of iron carbon filler. The invention also provides a method for degassing the hydrogen sulfide gas in the drainage pipe network, which uses the device for degassing the hydrogen sulfide gas in the drainage pipe network. The device and the method for degassing hydrogen sulfide gas in a drainage pipe network utilize the impeller to reoxygenate the water body, are beneficial to removing the hydrogen sulfide in the water body, further remove the hydrogen sulfide by utilizing iron ions released by the iron-carbon filler, remove the hydrogen sulfide gas in a drainage pipeline from the source, ensure the personal safety of workers and remove the potential safety hazard of pipeline explosion; the lifting piece is utilized to transfer and lift the device, so that the position of the device in the drainage pipe network is controlled, the purpose that workers do not need to go into the well is achieved, and the application cost of the hydrogen sulfide gas removing device in the drainage pipe is greatly reduced.
Description
Technical Field
The invention belongs to the field of water treatment equipment, relates to treatment of harmful gas in a drainage pipe network, and particularly relates to a device and a method for degassing hydrogen sulfide gas in the drainage pipe network.
Background
The urban drainage pipe network is an important component of urban infrastructure, and the stable operation of the urban drainage pipe network plays an important role in the life of residents and the urban environment. However, in recent years there has been an increasing problem with sewer pipes, and the most discussed is the effect of harmful gases in sewer pipes. Because the sewage stays in the pipeline for a long time, an anaerobic environment is easily formed in the bottom mud, and a large amount of toxic and harmful gas can be generated in a drainage pipe network by some anaerobic microorganisms.
The content of sulfate in the municipal sewage is 40-200 mg/l, and the sulfate in a pipe network is easy to be reduced by sulfate reducing bacteria to generate a large amount of hydrogen sulfide gas which is also a main component of toxic and harmful gas in a pipeline. The inhaled cell tissue hypoxia of human body can cause, can lead to shock in severe cases and even endanger life, if not in time get rid of from the sewage pipe network, produce very big potential safety hazard to the maintenance staff. The hydrogen sulfide gas emits foul smell, and the bad influence is also generated on the urban environment and the comfort level of the life of residents. In addition, hydrogen sulfide gas build up in the network can cause corrosion to the pipeline, and Vinck considers that the cost of repairing pipeline corrosion is 10% of the cost of sewage collection and treatment, and may be even higher. Therefore, the removal of hydrogen sulfide gas in the drain network is very critical to the development of the city.
For the control of the hydrogen sulfide gas, domestic research is relatively few, most of the research focuses on removing the hydrogen sulfide gas volatilized into the air in the drainage pipeline, and most of the research focuses on static adsorption of chemicals or degassing of the hydrogen sulfide gas by adopting an adsorption material attached to an air extraction device. Due to the influence of temperature, chemical change and biological flora in the water body, hydrogen sulfide gas in the drainage pipeline is continuously generated and has certain solubility, and the removal efficiency of the hydrogen sulfide gas in the drainage pipeline network is not high by a mode of removing the hydrogen sulfide outside the water body; there have been many studies on hydrogen sulfide gas in special drainage pipelines abroad, but although special aeration equipment is adopted abroad, a lot of studies on control measures are still carried out. These method measures can be generally divided into three categories:
(1) the oxidation-reduction potential of the sewage environment in the pipeline is improved, and the generation of sulfide and methane is controlled.
(2) The pH value of the sewage environment is improved, and the activity of methanogen and sulfate reducing bacteria is inhibited.
(3) And adding metal salt to control hydrogen sulfide and methane.
These measures, while effective in controlling hydrogen sulfide, have various drawbacks. For example, the measures for improving the oxidation-reduction potential include that although hydrogen sulfide can be controlled by injecting oxygen and adding nitric acid nitrogen, the consumption of fatty acid is increased to a certain extent, and the adverse effect is generated on the downstream denitrification and descaling; the soda lime added for increasing the pH value has complex equipment and very high cost when being continuously added; iron salt addition is also very effective for hydrogen sulfide control in pipelines, but continuous addition equipment is complex and can result in increased cost of harmful gas control.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a device and a method for degassing hydrogen sulfide gas in a drainage pipe network, so as to solve the problem that the hydrogen sulfide gas in the drainage pipe network cannot be efficiently removed at low cost by the hydrogen sulfide removing device in the drainage pipe network in the prior art.
In order to solve the technical problem, the application adopts the following technical scheme:
a kind of drain pipe network hydrogen sulfide gas removing device, including supporting the foot, side plate installed on supporting the foot, cross bar installed on side plate and impeller installed on cross bar;
the impeller is made of iron-carbon filler.
The invention also discloses a method for degassing the hydrogen sulfide gas in the drainage pipe network, which uses the device for degassing the hydrogen sulfide gas in the drainage pipe network;
the device for degassing the hydrogen sulfide gas in the drainage pipe network is placed in the water body in the inspection well of the drainage pipe network.
The invention also has the following technical characteristics:
specifically, at least two lifting lugs are further fixed on the side plates, and a hanging piece is hooked on each lifting lug.
Specifically, the side plate is at least one.
Specifically, at least one group of bearings are installed on the side plates, and the cross rod penetrates through and is installed on the inner rings of the bearings.
Specifically, each cross rod is provided with at least one impeller;
the impeller comprises a wheel seat, blades and wheel seat holes, wherein the wheel seat holes are through holes in the wheel seat, and the number of the blades is at least three, and the blades are uniformly and fixedly connected to the wheel seat.
Specifically, the wheel seat and the blades are integrally formed by pressing a common iron-carbon filler capable of releasing iron ions after being baked at high temperature.
Specifically, the hydrogen sulfide gas degassing device for the drainage pipe network is placed in the water body of a drop well or a mud trap at the intersection of the sewage branch pipes of the drainage pipe network.
Compared with the prior art, the invention has the beneficial technical effects that:
compared with the general method of adding ferric salt and nitric acid nitrogen, the device and the method for removing the gas from the hydrogen sulfide gas in the drainage pipe network have the following advantages: domestic sewage is discharged every day, the dosage is large, and the cost is high; the equipment releases iron ions into the sewage by utilizing the electrochemical corrosion of iron and carbon, and the cost is far lower than that of a medicament adding method;
compared with the traditional method and equipment, the device and the method for degassing the hydrogen sulfide gas in the drainage pipe network have the advantages that sewage in the pipe network continuously flows, a large amount of microorganisms exist, the demand of oxygen is high, and the equipment effectively accelerates the mass transfer of air in the inspection well into the sewage;
(III) the device and the method for degassing the hydrogen sulfide gas in the drainage pipe network utilize the short contact time in the sewage inspection well to form iron ions with relatively low concentration. Because of the interaction with Fe (OH)2Compared with FeS, the solubility of FeS is lower, so that hydrogen sulfide in sewage can be effectively removed at low concentration.
(IV) the device and the method for degassing the hydrogen sulfide gas in the drainage pipe network creatively reoxygenate the water body in the underground pipe network by applying the device, further remove the dissolved hydrogen sulfide in the water body, remove the hydrogen sulfide gas in the drainage pipe network from the source, ensure the personal safety of workers and remove the potential safety hazard of pipeline explosion.
(V) the device for removing the hydrogen sulfide gas in the drainage pipe network has a simple structure, and the hanging piece is used for lowering and hanging, so that the position of the equipment in the drainage pipe network is controlled, the aim that workers do not need to go into a well is fulfilled, and the application cost of the device for removing the hydrogen sulfide gas in the drainage pipe network is greatly reduced.
Drawings
FIG. 1 is a schematic isometric view of the overall structure of the present invention;
FIG. 2 is a schematic view of the placement of the present invention in a launder;
FIG. 3 is a schematic axial view of the impeller construction of the present invention;
FIG. 4 is a schematic view of the installation of the apparatus of the present invention in a manhole (sectioned in the direction of water flow);
FIG. 5 is a schematic view of the installation of the apparatus of the present invention in a manhole (cut-off flow direction section);
FIG. 6 is a graph showing the results of measurements of hydrogen sulfide removal efficiency at different contact times in accordance with the present invention;
FIG. 7 shows the measurement results of hydrogen sulfide removal efficiency of the present invention at different iron salt dosages;
the meaning of the individual reference symbols in the figures is: 1-supporting feet, 2-side plates, 3-cross rods, 4-impellers, 5-lifting lugs, 6-lifting pieces, 7-bearings, 8-inspection wells, 41-wheel seats, 42-blades and 43-wheel seat holes.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention fall within the protection scope of the present invention. The present invention will be described in further detail with reference to examples.
Example (b):
the embodiment provides a hydrogen sulfide gas degassing device for a drainage pipe network, which comprises a supporting foot 1, a side plate 2 installed on the supporting foot, a cross rod 3 installed on the side plate 2 and an impeller 4 installed on the cross rod 3, as shown in fig. 1 to 5;
the impeller 4 is made of iron carbon filler.
The embodiment also provides a method for degassing the hydrogen sulfide gas in the drainage pipe network, which uses the device for degassing the hydrogen sulfide gas in the drainage pipe network;
the device for degassing the hydrogen sulfide gas in the drainage pipe network is placed in the water body in the drainage pipe network inspection well 8.
As a specific scheme of the hydrogen sulfide gas degassing device for the drainage pipe network in this embodiment, two lifting lugs 5 are further fixed on the side plate 2 in this embodiment, and a hanging piece 6 is hooked on the lifting lugs 5.
As a preferable scheme of the device for degassing hydrogen sulfide gas in a drainage pipe network of the present embodiment, the number of the side plates 2 in the present embodiment is two.
As a preferable scheme of the device for degassing hydrogen sulfide gas in a drainage pipe network of the embodiment, eight groups of bearings 7 are installed on the side plate 2 of the embodiment, and the cross rod 3 is installed on the inner ring of the bearing 7 in a penetrating manner.
As a preferable scheme of the device for degassing hydrogen sulfide gas in a drainage pipe network of the present embodiment, eight impellers 4 are mounted on each cross bar 3 of the present embodiment; the impeller 4 comprises a wheel seat 41, blades 42 and wheel seat holes 43, the wheel seat holes 43 are through holes on the wheel seat 41, and the blades 42 are four blades uniformly and fixedly connected on the wheel seat 41.
As a preferable scheme of the device for degassing hydrogen sulfide gas in a drain pipe network of this embodiment, the wheel seat 41 and the blades 42 of this embodiment are integrally formed by pressing a common iron-carbon filler capable of releasing iron ions after being baked at a high temperature.
As a preferable scheme of the method for degassing the hydrogen sulfide gas in the drainage pipe network of the embodiment, the device for degassing the hydrogen sulfide gas in the drainage pipe network of the embodiment is placed in the water body of a drop well or a mud-sinking well at the intersection of the sewage branch pipes in the drainage pipe network.
The device and the method for degassing hydrogen sulfide gas in the drainage pipe network have simple and feasible design and structure, the device is placed in water in a drainage pipeline, the water body is further reoxygenated by using the disturbance of the impeller 4 on the flow of the water body, and the hydrogen sulfide gas in the drainage pipe network is removed by using the high efficiency of releasing iron ions by using the common iron-carbon filler in the sewage treatment process.
The device and the method for degassing the hydrogen sulfide gas in the drainage pipe network are completely different in device and removal mode and principle although common iron-carbon fillers in a sewage treatment process are also used. In the treatment process of the sewage treatment plant, the contact time of the sewage and the iron-carbon filler is longer, the concentration of iron ions is high, and more Fe (OH) is formed3、Fe(OH)2The colloid achieves the aim of reducing the COD of the wastewater by utilizing the flocculation of the colloid; however, in the device and the method for degassing the hydrogen sulfide gas in the drainage pipe network, the relatively low concentration of iron ions is formed by utilizing the short contact time in the sewage inspection well. Because of the interaction with Fe (OH)2Compared with FeS, the solubility of FeS is lower, so that hydrogen sulfide in sewage can be effectively removed at low concentration.
The device and the method for degassing the hydrogen sulfide gas in the drainage pipe network change the traditional measure of continuously adding iron salt, and sewage in an inspection well drives the impeller 4 to roll when flowing through the device for degassing the hydrogen sulfide gas in the drainage pipe network, so that the reoxygenation effect of the sewage is increased, and the cathode reaction of the electrochemical reaction of the iron-carbon filler is accelerated: o is2+2H2O+4e→4OH-More iron ions are released into the sewage, and the alkalinity of the sewage is increased, so that the aim of controlling the hydrogen sulfide is fulfilled.
As shown in the attached figure 4, the area I is an upstream pipeline of the inspection well, the area II is the inspection well, and the area III is a downstream pipeline. The device is placed in a zone II, sewage flows into the drainage pipe network hydrogen sulfide gas degassing device from the zone I, the impeller 4 is driven by water flow to roll, the mass transfer efficiency of air in the inspection well to the sewage is increased, and the filler can also perform electrochemical reaction with the sewage:
anode: 2Fe → 2Fe2++4e-
Cathode: o is2+2H2O+4e→4OH-
The invention relates to a device and a method for degassing hydrogen sulfide gas in a drainage pipe network, which are carried out by the following steps:
the method comprises the following steps: and designing and installing proper quantity of impellers 4 according to the initial hydrogen sulfide concentration in water and the water quantity of the drainage pipe network, and assembling the drainage pipe network hydrogen sulfide gas degassing device.
Step two: the device for degassing hydrogen sulfide gas in a drainage pipe network is placed into the water body in a drainage pipe network inspection well 8 through a hanging piece 6, preferably into the water body of a drop well or a mud trap at the junction of sewage branch pipes, and the overall angle of the device is adjusted.
Step three: the whole device is periodically overhauled and the impeller 4 is replaced, so that the hydrogen sulfide dissolved in the water body in the drain pipe network is continuously removed and kept at a low level.
Simulation experiment for performance test
(1) Experimental example:
firstly, measuring the removal efficiency of hydrogen sulfide
800mL of domestic sewage is added into 8 beakers with 1.5L, 100g of filler is added, and the contact time of the filler is set to be 0.5min, 1min, 1.5min, 2min, 2.5min, 3min, 3.5min and 4min respectively. The numbers are a, b, c, d, e, f, g and h. And measuring the content of the hydrogen sulfide after sealing and storing for 8 hours.
As shown in FIG. 6, in the case of 800ml of domestic sewage, hydrogen sulfide was not substantially generated when the reaction time was 7min and the filler was 100 g.
Second, the number of the devices and the amount of the filler are calculated
Setting the pipe diameter of a drainage pipe network to be 0.3m, the fullness to be 0.5, the diameter of an inspection well to be 0.8m, the flow speed of sewage to be 0.6m/s and the reaction contact time to be 1s, and calculating to obtain the corresponding relation between the number of the devices and the weight of the filler and the reaction time in each device on the basis of a certain hydrogen sulfide control effect, wherein the specific relation is shown in table 1:
TABLE 1 number of units according to the invention and amount of filler based on reaction time
(2) Comparative example:
800mL of sewage is respectively added into 8 beakers with 1.5L, and concentrated iron salt with the concentration of 100mg/L is added into the beakers with the amount of 40, 80, 120, 160, 200, 240, 280 and 320mL, so that the concentration gradient of the iron salt in the sewage is 5mg/L, 10mg/L, 15mg/L, 20mg/L, 25mg/L, 30mg/L, 35mg/L and 40mg/L, and the serial numbers are No. 1, 2, 3, 4, 5, 6, 7 and 8. And measuring the content of the hydrogen sulfide after sealing and storing for 8 hours.
The experimental result is shown in figure 7, and the experimental result can be obtained that basically no hydrogen sulfide is produced when the concentration of iron salt added into 800mL of sewage is 35-40 mg/L.
Blank control group: 800ml of sewage is added into a 1.5L beaker, no treatment is carried out, and the measured hydrogen sulfide content is 14.3ppm after the beaker is sealed and stored for 8 hours.
(3) Cost measurement and calculation under simultaneous removal efficiency
It can be seen from the data of the experimental example and the comparative example that the removal effect on the domestic sewage is relatively similar on the following four adding working conditions, and the cost measurement experiment is calculated according to the four working conditions in the table 2:
TABLE 2 Experimental and comparative examples with similar final gas concentrations
The hydrogen sulfide removal cost under the same control efficiency was calculated from four operating points in the table as follows:
the price of the commercial 1t ferric trichloride is about 2800 yuan. The price of 1t of filler is about 600 yuan, and the continuous service life is about 30 d.
The treatment effect is calculated according to the percentage reduction of gas relative to the blank group, for example, 80ml of iron salt is added, the gas concentration is 9.5, and the treatment effect is calculated as follows: (14.3-9.5)/14.3-33.56%. The specific calculation results are shown in table 3:
TABLE 3 cost estimation based on similar conditions and treatment Effect
Performance test experimental result analysis: from the cost comparison of 4 working condition points, the cost of adding the filler is 30-50% lower than that of adding the ferric salt, and the iron salt adding mode and the maintenance workload in the drainage pipe network are far higher than those of the equipment for maintaining and replacing the filler.
From the experimental results, the device and the method for degassing the hydrogen sulfide gas in the drainage pipe network have the advantages that the use cost is greatly reduced, and the working difficulty and the working amount of equipment or material adding are relatively low when the same removal effect is given.
Moreover, the increase of the reoxygenation to the water body when the device is used in the water body is not considered in the natural performance test experiment, but the device can increase the reoxygenation in the water body in the hydrogen sulfide degassing process without any problem in the actual use process. Therefore, the application of the device can accelerate the cathode reaction of the electrochemical reaction of the iron-carbon filler, release more iron ions into the sewage, increase the alkalinity of the sewage and further improve the removal efficiency of the hydrogen sulfide in the water body. That is, the cost-effectiveness ratio during actual use of the device of the present invention can be further higher than the results shown in table 3.
Claims (7)
1. A gas removal device for a hydrogen sulfide gas in a drainage pipe network is characterized by comprising a supporting foot (1), a side plate (2) arranged on the supporting foot, a cross rod (3) arranged on the side plate (2) and an impeller (4) arranged on the cross rod (3);
the impeller (4) comprises a wheel seat (41), blades (42) and a wheel seat hole (43);
the wheel seat (41) and the blades (42) are integrally formed by pressing a common iron-carbon filler capable of releasing iron ions after being baked at high temperature.
2. The drainpipe network hydrogen sulfide gas degassing device of claim 1, wherein at least two lifting lugs (5) are fixed on the side plate (2), and a hanging piece (6) is hooked on the lifting lugs (5).
3. The drainpipe network hydrogen sulfide gas degassing device of claim 1, wherein the side plate (2) is at least one.
4. The drainpipe network hydrogen sulfide gas degassing device as claimed in claim 3, wherein at least one set of bearings (7) is installed on the side plate (2), and the cross bar (3) is installed in the inner ring of the bearing (7) in a penetrating manner.
5. The drainpipe network hydrogen sulfide gas removal device as claimed in claim 4, wherein each cross bar (3) is provided with at least one impeller (4);
the wheel seat holes (43) are through holes on the wheel seat (41), and the number of the blades (42) is at least three, and the blades are uniformly and fixedly connected to the wheel seat (41).
6. A method for degassing hydrogen sulfide gas in a drainage pipe network, which is characterized by using the device for degassing hydrogen sulfide gas in the drainage pipe network according to any one of claims 1-5;
the device for degassing the hydrogen sulfide gas in the drainage pipe network is placed in the water body in the inspection well (8) of the drainage pipe network.
7. The method for degassing hydrogen sulfide gas in a drainage pipe network according to claim 6, wherein the device for degassing hydrogen sulfide gas in a drainage pipe network is placed in the water body of a drop well or a mud pit at the junction of the sewage branch pipes in the drainage pipe network.
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