CN115259453A - Advanced treatment device for reducing concentration of heavy metal in discharged wastewater and use method thereof - Google Patents
Advanced treatment device for reducing concentration of heavy metal in discharged wastewater and use method thereof Download PDFInfo
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- CN115259453A CN115259453A CN202210852988.9A CN202210852988A CN115259453A CN 115259453 A CN115259453 A CN 115259453A CN 202210852988 A CN202210852988 A CN 202210852988A CN 115259453 A CN115259453 A CN 115259453A
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- closed cavity
- shaped drainage
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
Abstract
The invention discloses an advanced treatment device for reducing the concentration of heavy metals in discharged wastewater and a using method thereof, wherein the advanced treatment device comprises the following steps: comprises a closed cavity; a wastewater discharge port; an arc-shaped drainage plate; a rotating shaft; one end of the lower arc plate is fixedly connected with the rotating shaft, and the bending direction of the arc surface of the lower arc plate faces the arc-shaped drainage plate; one end of the upper arc plate is fixedly connected with the rotating shaft, and the bending direction of the arc surface of the upper arc plate deviates from the arc-shaped drainage plate; the limiting plate is fixedly connected to the inner side surface of the closed cavity and is in clearance fit with the upper arc plate; a feed inlet; and (4) a water outlet. The invention has the beneficial effects that the water flow is disturbed through the S-shaped structural design of the upper arc plate and the lower arc plate and the matching of the arc-shaped flow guide plate, and after the sodium bentonite and the wastewater are fully mixed, the characteristics of high specific surface area and interlayer ion exchange of the bentonite are fully utilized, so that the efficiency of adsorbing heavy metal pollutants is improved.
Description
Technical Field
The invention relates to the technical field of advanced treatment of heavy metal wastewater, in particular to an advanced treatment device for reducing the concentration of heavy metal in discharged wastewater and a using method thereof.
Background
The discharged wastewater is generated in the treatment process of waste sulfuric acid (or wastewater) in the chemical industry, the metallurgy industry and other industries, generally, the calcium concentration of the discharged wastewater is 300-1200 mg/L, the sulfate radical concentration is 1000-8000 mg/L, a certain amount of inorganic salt (such as sodium sulfate, sodium chloride, sodium sulfite and the like), trace lead, copper, zinc and trace thallium and other heavy metal ions are also contained, due to the existence of soluble salt, the lead concentration in the discharged wastewater is about 0.6-2 mg/L, the copper concentration is about 0.6-2 mg/L, the thallium concentration is about 20-40 ug/L, and the heavy metal pollution concentration exceeds the environmental protection discharge requirement. Therefore, attention must be paid to and the problem of up-to-standard discharge of heavy metals in the wastewater must be solved. In order to achieve the standard discharge of the waste water, treatment methods such as chemical hardness reduction, softening, reverse osmosis, concentration, evaporative crystallization and the like are commonly adopted at present, the treatment process is complex, and a certain amount of solid waste or hazardous waste is generated.
For example, chinese patent publication No. CN114702098A discloses a heavy metal wastewater treatment agent and a wastewater treatment method, in which the heavy metal wastewater treatment agent is added into heavy metal wastewater, then the wastewater treatment agent and the heavy metal wastewater are fully stirred uniformly, and then the wastewater treatment is completed after standing, precipitating and filtering to remove precipitates, wherein the stirring is usually performed in a reaction tank, specifically, the feeding is performed above the reaction tank, a stirring paddle is disposed in the reaction tank, and the stirring paddle is started to stir the heavy metal wastewater treatment agent and the heavy metal wastewater in the reaction tank.
Disclosure of Invention
The invention aims to solve the technical problems that the existing heavy metal wastewater treatment method cannot ensure the heavy metal absorption effect, and stirring energy consumption by using a stirring paddle is high, so that the deep treatment device for reducing the concentration of heavy metal in discharged wastewater and the use method thereof are provided.
The technical scheme of the invention is as follows: the advanced treatment device for reducing the concentration of heavy metal in the discharged wastewater comprises a closed cavity; the waste water discharge port is positioned on the side surface of the closed cavity; one end of the arc-shaped drainage plate is hinged with the inner side face of the closed cavity, so that the arc-shaped drainage plate surrounds the wastewater discharge port; the rotating shaft is arranged in the closed cavity; one end of the lower arc plate is fixedly connected with the rotating shaft, and the bending direction of the arc surface of the lower arc plate faces the arc-shaped drainage plate; one end of the upper arc plate is fixedly connected with the rotating shaft, and the bending direction of the arc surface of the upper arc plate deviates from the arc-shaped drainage plate; the driving mechanism is positioned on the outer side of the closed cavity and is in transmission connection with the rotating shaft; the limiting plate is fixedly connected to the inner side surface of the closed cavity and is in clearance fit with the upper arc plate; the feed inlet is formed in the bottom of the closed cavity, and the projection of the feed inlet is positioned between the arc-shaped drainage plate and the lower arc plate; and the water outlet is formed in the side wall of the closed cavity below the limiting plate.
The improvement of the scheme is that the outer surface of the cambered surface of the lower arc plate is hinged with a swing rod.
The further improvement of above-mentioned scheme is the feed inlet communicates with the bottom that connects the hopper, the top that connects the hopper is equipped with the belt weigher, belt weigher top is equipped with the feed bin, the feed bin bottom is equipped with the star valve.
The further improvement of the scheme is that the lower water level meter is arranged on the inner side of the closed cavity and below the arc-shaped drainage plate, and the lower water level meter is in signal connection with the star-shaped valve to control the opening of the star-shaped valve.
According to the scheme, the inner side of the closed cavity is provided with an upper water level meter above the arc-shaped drainage plate, the height of the upper water level meter is lower than the highest point of the upper arc plate, and the upper water level meter is in signal connection with the star-shaped valve to control the closing of the upper water level meter.
In the scheme, the water outlet is communicated with the filter press through a pump.
The use method of the advanced treatment device for reducing the concentration of heavy metals in discharged wastewater comprises the following steps: (1) Rotating the rotating shaft to enable the upper arc plate and the lower arc plate to rotate anticlockwise around the rotating shaft until the lower arc plate is contacted with the bottom of the closed cavity, and separating the closed cavity into a left cavity and a right cavity by the lower arc plate and the upper arc plate; (2) The wastewater discharge inlet is opened, wastewater to be treated is input into the closed cavity, the wastewater impacts the arc-shaped drainage plate to enable the arc-shaped drainage plate to deflect around the hinged part of the arc-shaped drainage plate and the closed cavity, a gap is formed between the lower part of the arc-shaped drainage plate and the side wall of the closed cavity, and the wastewater is drained into the left cavity; (3) When the waste water liquid level in the left cavity rises to a take the altitude, continuously drop into sodium bentonite in to airtight cavity by the feed inlet, sodium bentonite and waste water intensive mixing, the liquid level when left cavity risees to the regional back of last arc board, go up the arc board pressurized around pivot clockwise rotation, the arc board is around pivot clockwise rotation under the drive, when going up the arc board and blocked by the limiting plate, airtight cavity formation passageway is kept away from to the bottom of lower arc board, the waste water that has mixed sodium bentonite is discharged into the delivery port from this passageway.
The invention has the advantages that the dynamic stirring of a stirring paddle is cancelled, the water flow is disturbed through the S-shaped structural design of the upper arc plate and the lower arc plate and the matching of the arc-shaped drainage plate, when the sodium bentonite and the wastewater are fully mixed, the characteristics of higher specific surface area and interlayer ion exchange of the bentonite are fully utilized, the efficiency of adsorbing heavy metal pollutants is improved, and the sodium bentonite and the wastewater are discharged from a water outlet.
Drawings
FIG. 1 is a schematic view of the deep processing apparatus of the present invention in a normal state;
FIG. 2 is a schematic view of the deep processing apparatus according to the present invention;
FIG. 3 is a schematic view of embodiment 2 of the present invention;
FIG. 4 is a schematic view of embodiment 3 of the present invention;
in the figure, the filter press comprises a closed cavity 1, a waste water discharge port 2, an arc-shaped drainage plate 3, an arc-shaped drainage plate 4, a rotating shaft 5, a lower arc plate 6, an upper arc plate 7, a limiting plate 8, a feed inlet 9, a water outlet 10, a swing rod 11, a receiving hopper 12, a belt weigher 13, a storage bin 14, a star valve 15, a lower water level meter 16, an upper water level meter 17 and a filter press.
Detailed Description
The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments based on the embodiments in the present invention, without any inventive work, will be apparent to those skilled in the art from the following description.
As shown in fig. 1-2, example 1: the advanced treatment device for reducing the concentration of heavy metal in discharged wastewater comprises a closed cavity 1; a wastewater discharge port 2, which is positioned on the side surface of the closed cavity; one end of the arc-shaped drainage plate 3 is hinged with the inner side surface of the closed cavity, so that the arc-shaped drainage plate surrounds a wastewater discharge port, the arc-shaped drainage plate is attached to the inner side surface of the closed cavity in a normal state, and the arc-shaped drainage plate can be opened when water flow impact is received; the rotating shaft 4 is arranged in the closed cavity; one end of the lower arc plate 5 is fixedly connected with the rotating shaft, and the bending direction of the arc surface of the lower arc plate faces the arc-shaped drainage plate; the upper arc plate 6, one end of the said upper arc plate is fixedly connected with spindle and the bending direction of its cambered surface deviates from the arc drainage plate, lower arc plate and upper arc plate form the S-shaped structure that the crooked cambered surface is opposite, the length of the lower arc plate is greater than the upper arc plate, in order to guarantee the stability of the S-shaped structure under the normal state, the S-shaped structure isolates the closed cavity into two chambers of left and right sides, the distance between arc drainage plate and the S-shaped structure is enough for the arc drainage plate to rotate certain angle; the driving mechanism is positioned outside the closed cavity and is in transmission connection with the rotating shaft, the driving mechanism can be a handle, the rotating shaft can be rotated by manually rotating the handle, and the driving mechanism can also be a motor, and the rotating shaft is driven to rotate by the motor; the limiting plate 7 is fixedly connected to the inner side surface of the closed cavity and is in clearance fit with the upper arc plate; the feeding hole 8 is formed in the bottom of the closed cavity, and the projection of the feeding hole is positioned between the arc-shaped drainage plate and the lower arc plate, so that sodium bentonite thrown from the feeding hole can directly fall into the left cavity; and the water outlet 9 is formed in the side wall of the closed cavity below the limiting plate.
The use method of the advanced treatment device for reducing the concentration of heavy metals in discharged wastewater comprises the following steps: (1) The upper arc plate and the lower arc plate rotate anticlockwise around the rotating shaft by rotating the rotating shaft until the lower arc plate is contacted with the bottom of the closed cavity, the stability of the S-shaped structural state can be ensured at the moment because the length of the lower arc plate is greater than that of the upper arc plate, the closed cavity is isolated into a left cavity and a right cavity by the lower arc plate and the upper arc plate, and the closed cavity can only rotate clockwise but not anticlockwise due to the characteristic of the S-shaped structure; (2) The waste water discharge inlet is opened, waste water to be treated is input into the closed cavity, the waste water impacts the arc-shaped drainage plate to enable the arc-shaped drainage plate to deflect around the hinged position of the arc-shaped drainage plate and the closed cavity, a gap is formed between the lower part of the arc-shaped drainage plate and the side wall of the closed cavity, and the waste water is drained into the left cavity, so that the waste water is deflected to easily form turbulence in the left cavity, and the mixing with sodium bentonite is facilitated; (3) When the waste water liquid level in the left cavity rises to a certain height, continuously adding sodium bentonite into the sealed cavity through the feed inlet, the sodium bentonite can be fully mixed with waste water forming turbulence to form mixed liquid, when the mixed liquid level of the left cavity rises to the upper arc plate area, the sodium bentonite stops being added at the moment, the upper arc plate is pressed to rotate clockwise around the rotating shaft, the lower arc plate is driven to rotate clockwise around the rotating shaft, when the upper arc plate is blocked by the limiting plate, the bottom of the lower arc plate is far away from the sealed cavity to form a channel, the waste water mixed with the sodium bentonite is discharged into the right cavity from the channel and finally discharged out of the water outlet, in the process, the mixed liquid disturbance caused by the rotation of the S-shaped structure is generated, the mixed liquid moves vertically from the upper arc plate position to the lower arc plate position, the sodium bentonite is fully contacted with the waste water, when the liquid level of the left cavity falls to the lower arc plate area, the mixed liquid is used for pushing the right of the lower arc plate, the mixed liquid returns to the initial state, the channel is closed, the mixed liquid discharged from the channel is guaranteed to be fully mixed liquid, and the left mixed liquid is reserved in the mixed liquid in the left mixed liquid.
As a preferable example of the embodiment 1, the outer surface of the cambered surface of the lower arc plate is hinged with a swing rod 10, and the swing rod has the function of freely swinging when being impacted by water flow so as to accelerate the stirring of the waste water and the sodium bentonite. Enough distance is kept between the swing rod and the arc-shaped drainage plate, and the swing of the swing rod is prevented from being interfered by the arc-shaped drainage plate.
Example 2: as shown in fig. 3, the difference from embodiment 1 is that the feed inlet is communicated with the bottom of a receiving hopper 11, the top of the receiving hopper is provided with a belt weigher 12, a storage bin 13 is arranged above the belt weigher, and the bottom of the storage bin is provided with a star valve 14.
Waste water (the total amount of heavy metals in the waste water is not higher than 5 mg/L, and the flow is 5-50 m 3/h) generated by the waste sulfuric acid (or the waste water) after neutralization-precipitation treatment enters an advanced treatment device. The waste water generated by treating the waste sulfuric acid (or waste water) through neutralization-precipitation treatment is completely neutralized by alkaline substances (such as lime, caustic soda and the like), contains a certain amount of sulfate radicals, calcium, magnesium and other substances, and contains trace pollutants such as heavy metals, and the like, so that the environment-friendly discharge requirement is difficult to achieve.
The sodium bentonite is fed from a feed bin 13 through a star valve 14, is metered through a belt weigher 12, is conveyed to a receiving hopper 11, is conveyed into an advanced treatment device through the receiving hopper, is fully mixed, realizes the full mixing reaction of the bentonite and the wastewater, and adsorbs heavy metal pollutants. The total amount of lead, copper, zinc and thallium adsorbed by the sodium bentonite is about 5-15 g/kg, and because a certain amount of sulfate radicals, calcium ions, sodium ions and other substances exist in the wastewater, the adding amount of the sodium bentonite is determined according to the water inflow of the reaction tank and is 5-20 kg/m3Ensuring the total heavy metal content of the bentonite adsorption treatment. The deep treatment device can realize the intensive mixing of bentonite and waste water, and make full use of bentonite has higher specific surface area and the characteristics of ion exchange between the layers, promotes its efficiency of adsorbing heavy metal pollutants. The effluent of the mixing reaction tank is conveyed into a filter press 18 through a slurry pump for solid-liquid separation to obtain filtrate and filter cakes. Filtrate obtained by solid-liquid separationThe medium heavy metal pollutants meet the requirements of discharge standards, can be directly taken into a drainage pipeline to be discharged, and can also be used as inlet water for treating reuse water. Discharging the filtrate into a wastewater discharge pipeline, and recovering a filter cake. The filter cake can be used as a ball binder for metallurgy.
Example 3: as shown in fig. 4, the difference from embodiment 2 is that a lower level gauge 15 is arranged below the arc-shaped drainage plate inside the sealed cavity, the lower level gauge is in signal connection with the star-shaped valve to control the start of the star-shaped valve, and when the lower level gauge detects waste water, a signal is sent to the star-shaped valve to start the star-shaped valve. An upper water level meter 16 is arranged on the inner side of the closed cavity and above the arc-shaped drainage plate, the height of the upper water level meter is lower than the highest point of the upper arc plate, the upper water level meter is in signal connection with a star-shaped valve to control the upper water level meter to be closed, and the input amount of sodium bentonite is controlled by the upper water level meter and the lower water level meter.
The specific water quality parameters of the wastewater treatment are shown in the table 1:
table 1.
Claims (7)
1. Reduce the advanced treatment unit of heavy metal concentration in outer row waste water, characterized by: comprises a closed cavity (1); a waste water discharge port (2) which is positioned on the side surface of the closed cavity; one end of the arc-shaped drainage plate (3) is hinged with the inner side face of the closed cavity, so that the arc-shaped drainage plate surrounds the wastewater discharge port; the rotating shaft (4) is arranged in the closed cavity; one end of the lower arc plate (5) is fixedly connected with the rotating shaft, and the bending direction of the arc surface of the lower arc plate faces the arc-shaped drainage plate; one end of the upper arc plate (6) is fixedly connected with the rotating shaft, and the bending direction of the arc surface of the upper arc plate deviates from the arc-shaped drainage plate; the driving mechanism is positioned on the outer side of the closed cavity and is in transmission connection with the rotating shaft; the limiting plate (7) is fixedly connected to the inner side face of the closed cavity and is in clearance fit with the upper arc plate; the feeding hole (8) is formed in the bottom of the closed cavity, and the projection of the feeding hole is positioned between the arc-shaped drainage plate and the lower arc plate; and the water outlet (9) is formed in the side wall of the closed cavity below the limiting plate.
2. The advanced treatment unit for reducing the concentration of heavy metals in discharged wastewater according to claim 1, which is characterized in that: the outer surface of the cambered surface of the lower arc plate is hinged with a swing rod (10).
3. The advanced treatment device for reducing the concentration of heavy metals in discharged wastewater according to claim 1, which is characterized in that: the feed inlet communicates with the bottom that connects hopper (11), the top that connects the hopper is equipped with belt weigher (12), belt weigher top is equipped with feed bin (13), the feed bin bottom is equipped with star valve (14).
4. The advanced treatment device for reducing the concentration of heavy metals in discharged wastewater according to claim 3, which is characterized in that: and a lower water level meter (15) is arranged below the arc-shaped drainage plate on the inner side of the closed cavity and is in signal connection with the star-shaped valve to control the opening of the star-shaped valve.
5. The advanced treatment unit for reducing the concentration of heavy metals in discharged wastewater according to claim 3, wherein: an upper water level meter (16) is arranged on the inner side of the closed cavity and above the arc-shaped drainage plate, the height of the upper water level meter is lower than the highest point of the upper arc plate, and the upper water level meter is in signal connection with the star-shaped valve to control the closing of the upper water level meter.
6. The advanced treatment unit for reducing the concentration of heavy metals in discharged wastewater according to claim 1, which is characterized in that: the water outlet is communicated with a filter press (17) through a pump.
7. The use method of the advanced treatment device for reducing the concentration of heavy metals in discharged wastewater according to claim 1, is characterized in that: the method comprises the following steps: (1) Rotating the rotating shaft to enable the upper arc plate and the lower arc plate to rotate anticlockwise around the rotating shaft until the lower arc plate is contacted with the bottom of the closed cavity, and separating the closed cavity into a left cavity and a right cavity by the lower arc plate and the upper arc plate; (2) The wastewater discharge inlet is opened, wastewater to be treated is input into the closed cavity, the wastewater impacts the arc-shaped drainage plate to enable the arc-shaped drainage plate to deflect around the hinged part of the arc-shaped drainage plate and the closed cavity, a gap is formed between the lower part of the arc-shaped drainage plate and the side wall of the closed cavity, and the wastewater is drained into the left cavity; (3) When the waste water liquid level in the left cavity rises to a take the altitude, continuously drop into sodium bentonite in to airtight cavity by the feed inlet, sodium bentonite and waste water intensive mixing, the liquid level when left cavity risees to the regional back of last arc board, go up the arc board pressurized around pivot clockwise rotation, the arc board is around pivot clockwise rotation under the drive, when going up the arc board and blocked by the limiting plate, airtight cavity formation passageway is kept away from to the bottom of lower arc board, the waste water that has mixed sodium bentonite is discharged into the delivery port from this passageway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210852988.9A CN115259453A (en) | 2022-07-20 | 2022-07-20 | Advanced treatment device for reducing concentration of heavy metal in discharged wastewater and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210852988.9A CN115259453A (en) | 2022-07-20 | 2022-07-20 | Advanced treatment device for reducing concentration of heavy metal in discharged wastewater and use method thereof |
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| CN115259453A true CN115259453A (en) | 2022-11-01 |
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| CN202210852988.9A Withdrawn CN115259453A (en) | 2022-07-20 | 2022-07-20 | Advanced treatment device for reducing concentration of heavy metal in discharged wastewater and use method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4765908A (en) * | 1985-02-04 | 1988-08-23 | Barbara Monick | Process and composition for removing contaminants from wastewater |
| CN205475614U (en) * | 2016-01-01 | 2016-08-17 | 耿洪兵 | Floor drain of easy rotating is with deodorant non return inner core assembly |
| CN206323999U (en) * | 2016-12-02 | 2017-07-14 | 云南古耕农业科技开发有限公司 | A kind of rotary multibuchet feed trough |
| CN108756790A (en) * | 2018-05-25 | 2018-11-06 | 大连船舶重工集团有限公司 | A kind of drilling rig mud disposal system based on landwaste distributing trough |
| WO2019104775A1 (en) * | 2017-11-30 | 2019-06-06 | 苏州美洁生环保工程有限公司 | Multi-cavity integrated machine for biochemical treatment of kitchen garbage |
| CN216896008U (en) * | 2022-03-18 | 2022-07-05 | 浙江精泰阀门锻造有限公司 | Erosion-resistant valve body |
-
2022
- 2022-07-20 CN CN202210852988.9A patent/CN115259453A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4765908A (en) * | 1985-02-04 | 1988-08-23 | Barbara Monick | Process and composition for removing contaminants from wastewater |
| CN205475614U (en) * | 2016-01-01 | 2016-08-17 | 耿洪兵 | Floor drain of easy rotating is with deodorant non return inner core assembly |
| CN206323999U (en) * | 2016-12-02 | 2017-07-14 | 云南古耕农业科技开发有限公司 | A kind of rotary multibuchet feed trough |
| WO2019104775A1 (en) * | 2017-11-30 | 2019-06-06 | 苏州美洁生环保工程有限公司 | Multi-cavity integrated machine for biochemical treatment of kitchen garbage |
| CN108756790A (en) * | 2018-05-25 | 2018-11-06 | 大连船舶重工集团有限公司 | A kind of drilling rig mud disposal system based on landwaste distributing trough |
| CN216896008U (en) * | 2022-03-18 | 2022-07-05 | 浙江精泰阀门锻造有限公司 | Erosion-resistant valve body |
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Application publication date: 20221101 |