Dock derusting sewage treatment method

Abstract

The invention relates to the technical field of sewage treatment, in particular to a dock rust removal sewage treatment method which specifically comprises the following steps: S1, guiding dock rust removal sewage through a water inlet pipeline; s2, one end of the water inlet pipeline is connected into an integrated sewage treatment tank, so that impurities in the dock rust removal sewage are deposited and filtered; s3, the integrated sewage treatment tank is communicated with a biochemical reaction tank to remove microorganisms in the dock rust removal sewage; s4, adopting a membrane treatment device to communicate with the biochemical reaction tank by arranging a pump to remove dissolved salts, colloids, microorganisms, organic matters and the like in water; s5, a water outlet pipeline is arranged and used for guiding liquid, one end of the water outlet pipeline is connected with the membrane treatment device and used for guiding out the treated sewage, according to the dock ship rust removal sewage treatment scheme, rust, paint powder and microorganisms in water can be effectively removed, effluent can be directly recycled to serve as a high-pressure rust removal water source, and the water treatment efficiency is improved. The method is time-saving and labor-saving in operation, simple and practical, high in recovery efficiency, low in treatment cost and short in period.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a method for treating dock rust removal sewage. Background Art

[0002] With the increasing requirements for environmental protection, the traditional sandblasting rust removal process has been replaced by the high-pressure water rust removal process due to its large dust, loud noise, and large amount of mineral sand produced. The commonly used method for rust removal of dock ships is to use an ultra-high pressure water gun to remove rust from the outer plate. The principle is to generate a high-pressure water flow through a pressure pump and spray the water at a high speed onto the rusted surface. The high-speed water flow can impact and remove the rust layer and peel it off the metal surface. Its efficiency is three times that of the traditional sandblasting rust removal process. Due to its wet operation characteristics, it also greatly reduces dust emissions, and the problem of unorganized pollution caused by sandblasting dust has been fundamentally reversed. However, the use of high-pressure water rust removal technology will produce ship rust removal sewage, which contains a large amount of rust, paint powder, and microorganisms attached to the hull. Direct discharge will pollute the surrounding environment, so it also needs to be treated.

[0003] A Chinese invention patent (authorization announcement number: CN215633721U) discloses a sewage suction machine, comprising: a vacuum pump, an electric control box, a sewage suction pump, a rolling door, a sewage inlet, a liquid level observation port, a universal brake wheel, a water filter, a discharge trough, a forklift trough, a primary filter cartridge, a secondary filter cartridge, a tertiary filter cartridge, a water flow hole, a guardrail, a lifting lug, a handle, an air extraction filter, and a ladder. Rolling doors or hand-pushing doors are arranged at the front, rear, and side. One end of the sewage inlet is connected to a recovery pipe, and the other end enters a primary cabin of the sewage suction machine. The cabin is provided with a liquid level observation port. The sewage treated by coarse filtration in the primary cabin is discharged after passing through the filter cartridge cabin.

[0004] However, the above-mentioned device cannot recycle the wastewater after treating it. With the continuous advancement of the construction of a green standardization system for ship repair and construction, in order to meet the requirements of green development, quality management, safe production, and environmental protection of enterprises, and to respond to the country's "dual carbon" and energy conservation and emission reduction requirements, there is an urgent need for a method that can recycle rust removal wastewater. Summary of the invention

[0005] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution that can solve the above-mentioned problems.

[0006] A method for treating wastewater from shipyard rust removal, the wastewater treatment method is specifically as follows:

[0007] S1: Used to guide the dock derusting sewage through the water inlet pipeline;

[0008] S2: one end of the water inlet pipe is connected to an integrated sewage treatment tank to allow impurities in the dock rust removal sewage to be deposited and filtered;

[0009] S3: The integrated sewage treatment tank is connected to the biochemical reaction tank to remove microorganisms from the dock rust removal sewage;

[0010] S4: using a membrane treatment device to remove dissolved salts, colloids, microorganisms, organic matter, etc. in the water by setting a pump to connect the biochemical reaction pool;

[0011] S5: A water outlet pipeline is provided for guiding liquid, and one end of the water outlet pipeline is connected to the membrane treatment device for discharging the treated sewage.

[0012] As a further solution of the present invention: the integrated sewage treatment tank includes a coagulation zone, a sedimentation zone and a sand filtration zone. The dock rust removal sewage flows through the coagulation zone to coagulate large particle agglomerates, then flows through the sedimentation zone to sediment large particle agglomerates, and then passes through the sand filtration zone to filter small particle suspended matter.

[0013] As a further solution of the present invention: the coagulation zone is provided with a first dosing device, the first dosing device comprises a PAC agent and a PAM agent, the PAC agent is mixed with the PAM agent to mix the dock rust removal wastewater to coagulate large particle agglomerates.

[0014] As a further solution of the present invention: the coagulation zone includes a first coagulation zone and a second coagulation zone, the first coagulation zone and the second coagulation zone are provided with an air stirring pipeline and a PAC dosing device pipeline, the PAC dosing device pipeline is introduced into the first coagulation zone, the PAM dosing device pipeline is introduced into the second coagulation zone, and a quartz sand filter layer and a water distribution pipe are provided in the sand filter zone.

[0015] As a further solution of the present invention: the biochemical reaction tank comprises a first reaction tank and a second reaction tank which are connected in sequence, and a mixed filler is suspended in the first reaction tank; an MBR device is arranged in the second reaction tank, and a sludge return pump is arranged in the second reaction tank, and the pump is connected to the first reaction tank through a pipeline.

[0016] As a further solution of the present invention: the biochemical reaction pool is provided with an aeration pipe and also includes an aeration fan, and the aeration fan and the aeration pipe output aeration.

[0017] As a further solution of the present invention: a rotor flow meter and a manual valve are arranged on the aeration pipe to adjust the gas volume.

[0018] As a further solution of the present invention: the membrane of the membrane treatment device is a reverse osmosis membrane.

[0019] As a further solution of the present invention: the membrane treatment device is provided with a security filter, a high-pressure pump and a reverse osmosis membrane treatment device. After the extremely fine suspended matter is removed from the security filter, the rust-removing wastewater is pumped into the reverse osmosis membrane by the high-pressure pump and discharged from the outlet pipe under high-pressure filtration.

[0020] As a further solution of the present invention: the biochemical reaction tank is provided with a second dosing device, which includes a citric acid dosing device and an antiscalant dosing device. The citric acid is used to chemically clean the reverse osmosis membrane to restore its efficiency, and the antiscalant dosing device is used to remove scale in the biochemical reaction tank.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The shipyard ship rust removal wastewater treatment scheme of the present invention adopts physical, chemical and biochemical methods to operate, which can effectively remove rust, paint powder and microorganisms in the water. The effluent can be directly reused as a high-pressure rust removal water source. The operation is time-saving and labor-saving, simple and practical, with high recovery efficiency, low treatment cost and short cycle.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a process flow chart of the ship dock ship rust removal wastewater treatment program.

[0026] Figure 2 It is a plan view of an integrated sewage treatment plant.

[0027] Figure 3 It is an elevation view of an integrated sewage treatment plant.

[0028] Figure 4 This is a large-scale picture of the MBR treatment device.

[0029] In the figure: 1-water inlet pipeline, 2-first dosing device, 3-coagulation section, 4-sedimentation section, 6-sand filter section, 7-first reaction tank, 8-mixed filler, 9-second reaction tank, 10-reflux pump, 11-MBR membrane, 12-explosion fan, 13-rotor flowmeter, 14-water outlet pump, 15-security filter, 16-second dosing device, 17-scaling agent, 18-citric acid, 19-high-pressure pump, 20-membrane treatment device, 21-water outlet pipeline, 22-second coagulation zone, 23-connecting pipe, 24-first coagulation zone, 25-internal explosion outlet, 26-bottom explosion outlet. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0034] See also Figure 1 In an embodiment of the present invention, a method for treating wastewater from shipyard rust removal is provided, and the wastewater treatment method is specifically as follows:

[0035] S1: Used to guide the dock derusting sewage through the water inlet pipeline

[0036] S2: One end of the water inlet pipeline is connected to an integrated sewage treatment tank to allow impurities in the dock rust removal sewage to be deposited and filtered.

[0037] S3: The integrated sewage treatment tank is connected to the biochemical reaction tank to remove microorganisms from the dock rust removal sewage.

[0038] S4: using a membrane treatment device to remove dissolved salts, colloids, microorganisms, organic matter, etc. in the water by setting a pump to connect the biochemical reaction pool.

[0039] S5: A water outlet pipeline is provided for guiding liquid, and one end of the water outlet pipeline is connected to the membrane treatment device for discharging the treated sewage.

[0040] Further Figures 1 to 3 As shown, in an embodiment of the present invention, the integrated sewage treatment tank includes a coagulation zone, a sedimentation zone and a sand filtration zone. The dock rust removal sewage flows through the coagulation zone to coagulate large particle agglomerates, then flows through the sedimentation zone to precipitate large particle agglomerates, and then passes through the sand filtration zone to filter small particle suspended matter. The coagulation zone is provided with a first dosing device, and the first dosing device includes a PAC agent and a PAM agent. The PAC agent is mixed with the PAM agent to mix the dock rust removal sewage to coagulate large particle agglomerates.

[0041] Working principle of this embodiment: the integrated sewage treatment tank is divided into a coagulation section, a sedimentation section and a sand filter section. The rust-removing sewage is first mixed with the PAC and PAM agents added by the dosing device 1 in the coagulation section. PAC is added in the first grid of the coagulation device, and PAM is added in the second grid of the coagulation device. PAC and PAM agents enable most of the free rust and paint powder in the water to condense into large particles. The mixed sewage flows into the sedimentation section through the bottom opening. An inclined tube filler is set in the sedimentation section to divide the sedimentation tank into a series of shallow sedimentation layers, which utilizes the laminar flow principle and improves the treatment capacity of the sedimentation tank; the addition of the inclined tube filler shortens the particle sedimentation distance, thereby shortening the sedimentation time; the inclined tube filler increases the sedimentation area of ​​the sedimentation tank, thereby improving the treatment efficiency. The coagulated sewage flows from bottom to top through the inclined tube filler, and the large particles in it move mutually in each shallow sedimentation layer and complete separation, but there are still some small particles of suspended matter in the sewage, which flow into the sand filter section along with the sewage from the upper outlet weir in the sedimentation section.

[0042] Further Figures 1 to 3 As shown, in the embodiment of the present invention, the coagulation zone includes a first coagulation zone and a second coagulation zone, an air stirring pipeline and a PAC dosing device pipeline are provided in the first coagulation zone and the second coagulation zone, the PAC dosing device pipeline is introduced into the first coagulation zone, the PAM dosing device pipeline is introduced into the second coagulation zone, a quartz sand filter layer and a water distribution pipe are provided in the sand filter zone, the biochemical reaction tank includes a first reaction tank and a second reaction tank connected in sequence, a mixed filler is suspended in the first reaction tank; an MBR device is provided in the second reaction tank, a sludge return pump is provided in the second reaction tank, and the pump is connected to the first reaction tank through a pipeline.

[0043] Working principle of this embodiment: The biochemical pool is divided into two compartments, namely the first reaction pool and the second reaction pool. Mixed fillers are suspended in the first reaction pool; an MBR device is set in the second reaction pool. Mixed fillers are developed on the basis of soft fillers and semi-soft fillers, and they have the advantages of both. Its structure is to change the plastic disc buckle into a double-circle large plastic ring, and press the aldehyded fiber or polyester yarn on the ring to make the fiber bundle evenly distributed; the inner circle is a snowflake-shaped plastic branch, which can not only hang the film, but also effectively cut the bubbles, and improve the transfer rate and utilization rate of oxygen. The water and gas biofilm is fully exchanged, and the organic matter in the water is efficiently treated. The MBR membrane adopts a flexible flat membrane, which brings together the series of advantages of traditional flat membranes and hollow fiber membranes, and is a new series of membrane component products.

[0044] Membrane bioreactor (MBR) is a new water treatment technology that combines a membrane separation unit with a biological treatment unit. It uses membrane components to replace secondary sedimentation tanks to maintain high active sludge concentration in the bioreactor to reduce the land occupation of sewage treatment facilities, and to reduce the amount of sludge by maintaining low sludge load. MBR has the following main features: high treatment efficiency and good effluent quality; compact equipment and small footprint; easy to achieve automatic control and simple operation and management.

[0045] Further Figures 1 to 4 As shown, in the embodiment of the present invention, an aeration pipe is provided in the biochemical reaction tank, and also includes an aeration fan. The aeration fan and the aeration pipe output aeration. A rotor flowmeter and a manual valve are provided on the aeration pipe to adjust the gas volume.

[0046] Working principle of this embodiment: an aeration pipe is provided in the biochemical reaction pool, and air is pumped into the two biochemical reaction pools through the matching aeration fan. A rotor flowmeter and a manual valve are provided on the aeration pipe of each pool to adjust the air volume to meet different needs.

[0047] The sewage first enters the first reaction tank, where aeration and mixed fillers remove most of the organic matter and microorganisms in the water. It flows into the second reaction tank through the weir plate. After the sewage in the second reaction tank passes through the biological and filtration effects of the MBR, the clean water is pumped out by a pump and pumped into the membrane treatment device through a pipeline.

[0048] Further Figures 1 to 4 As shown, in the embodiment of the present invention, the membrane of the membrane treatment device adopts a reverse osmosis membrane, and a security filter, a high-pressure pump and a reverse osmosis membrane treatment device are arranged in the membrane treatment device. After the extremely fine suspended matter is removed in the security filter, the rust-removing sewage is pumped into the reverse osmosis membrane by the high-pressure pump and discharged from the outlet pipe under high-pressure filtration.

[0049] Working principle of this embodiment: The membrane of the membrane treatment device adopts a reverse osmosis membrane, and a security filter and a high-pressure pump are provided at the front end of the reverse osmosis membrane. The principle of reverse osmosis technology is to separate these substances and water under the action of a pressure higher than the osmotic pressure of the solution, based on the fact that other substances cannot pass through the semipermeable membrane. The membrane pore size of the reverse osmosis membrane is very small, so it can effectively remove dissolved salts, colloids, microorganisms, organic matter, etc. in the water. The sewage after biochemical treatment is first pumped into the security filter, and the scale inhibitor is added through the scale inhibitor dosing device in the dosing device 2 at the front end of the security filter. After the extremely fine suspended matter is removed in the security filter, the rust-removing sewage is pumped into the reverse osmosis membrane by a high-pressure pump, and the water is discharged into the clean water tank in the dock after high-pressure filtration, waiting for reuse. The citric acid dosing device of the dosing device 2 regularly chemically cleans the reverse osmosis membrane to restore its efficiency.

[0050] Further Figures 1 to 4 As shown, in an embodiment of the present invention, the biochemical reaction tank is provided with a second dosing device, which includes a citric acid dosing device and an antiscalant dosing device. The citric acid is used to chemically clean the reverse osmosis membrane to restore its efficiency, and the antiscalant dosing device is used to remove scale in the biochemical reaction tank.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A method for treating rust removal wastewater in a dock, characterized in that: The sewage treatment method is specifically as follows: S1: Used to guide the dock derusting sewage through the water inlet pipeline S2: One end of the water inlet pipeline is connected to an integrated sewage treatment tank to allow impurities in the dock rust removal sewage to be deposited and filtered. S3: The integrated sewage treatment tank is connected to the biochemical reaction tank to remove microorganisms from the dock rust removal sewage. S4: using a membrane treatment device to remove dissolved salts, colloids, microorganisms, organic matter, etc. in the water by setting a pump to connect the biochemical reaction pool. S5: A water outlet pipeline is provided for guiding liquid, and one end of the water outlet pipeline is connected to the membrane treatment device for discharging the treated sewage.

2. The method for treating dock rust removal wastewater according to claim 1, characterized in that: The integrated sewage treatment pool includes a coagulation zone, a sedimentation zone and a sand filtration zone. The dock rust removal sewage flows through the coagulation zone to coagulate large particle agglomerates, then flows through the sedimentation zone to sediment large particle agglomerates, and then passes through the sand filtration zone to filter small particle suspended matter.

3. The method for treating dock rust removal wastewater according to claim 2, characterized in that: The coagulation zone is provided with a first dosing device, which includes a PAC agent and a PAM agent. The PAC agent is mixed with the PAM agent to mix the dock rust removal wastewater to condense large particle agglomerates.

4. The method for treating dock rust removal wastewater according to claim 3, characterized in that: The coagulation zone includes a first coagulation zone and a second coagulation zone, wherein an air stirring pipeline and a PAC dosing device pipeline are arranged in the first coagulation zone and the second coagulation zone, wherein the PAC dosing device pipeline is introduced into the first coagulation zone, and the PAM dosing device pipeline is introduced into the second coagulation zone, and a quartz sand filter layer and a water distribution pipe are arranged in the sand filter zone.

5. The method for treating dock rust removal wastewater according to claim 1, characterized in that: The biochemical reaction pool comprises a first reaction pool and a second reaction pool connected in sequence, wherein a mixed filler is suspended in the first reaction pool; an MBR device is arranged in the second reaction pool, and a sludge return pump is arranged in the second reaction pool, and the pump is connected to the first reaction pool through a pipeline.

6. The method for treating dock rust removal wastewater according to claim 1, characterized in that: The biochemical reaction pool is provided with an aeration pipe and also includes an aeration fan, and the aeration fan and the aeration pipe output explosive gas.

7. The method for treating dock rust removal wastewater according to claim 6, characterized in that: A rotor flow meter and a manual valve are installed on the aeration pipe to adjust the gas volume.

8. The method for treating dock rust removal wastewater according to claim 1, characterized in that: The membrane of the membrane treatment device adopts a reverse osmosis membrane.

9. The method for treating dock rust removal wastewater according to claim 8, characterized in that: The membrane treatment device is equipped with a security filter, a high-pressure pump and a reverse osmosis membrane treatment device. After the extremely fine suspended matter is removed from the rust-removing wastewater in the security filter, it is pumped into the reverse osmosis membrane by the high-pressure pump and discharged from the outlet pipe under high-pressure filtration.

10. The method for treating dock rust removal wastewater according to claim 1, characterized in that: The biochemical reaction tank is provided with a second dosing device, which includes a citric acid dosing device and an antiscalant dosing device. The citric acid is used for chemically cleaning the reverse osmosis membrane to restore its efficiency, and the antiscalant dosing device is used for removing scale in the biochemical reaction tank.

Images