Municipal water supply and drainage sewage pretreatment equipment and method

Abstract

The invention relates to the technical field of sewage treatment, in particular to municipal water supply and drainage sewage pretreatment equipment and method.The municipal water supply and drainage sewage pretreatment equipment comprises a treatment box, a water inlet pipe, a water outlet pipe, a reaction assembly, a plurality of partition plates, a plurality of net plates and a precipitation box, the water inlet pipe and the water outlet pipe are arranged on the treatment box, and the partition plates are alternately arranged in the treatment box, so that water flow flows in an S shape; the reaction assembly comprises a feeding box, a distribution pipe and a stirring rod set, the distribution pipe is provided with a plurality of discharging holes and arranged above the partition plate, the stirring rod set is arranged on one side of the distribution pipe, the net plate is arranged on one side of the stirring rod set, and the sedimentation box is arranged at the bottom of the treatment box. Therefore, sewage can be stirred, mixed and filtered for multiple times during flowing through the arrangement of multiple stages of partition plates and net plates, so that the sewage can be continuously treated, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a municipal water supply and drainage sewage pretreatment device and method. Background Art

[0002] Municipal water supply and drainage refers to the water supply and drainage system planned, constructed and managed by the municipal authorities within the city. The system aims to ensure the safe drinking water supply in the city, meet the needs of residents' daily life and industrial production, and effectively collect, transport and treat sewage and rainwater to prevent urban waterlogging, protect the environment and the sustainable use of water resources.

[0003] The existing sewage treatment device needs to add the reactant into the reaction box when treating sewage, stir it for a period of time, and then discharge it for the next treatment after the sewage reaction is completed. This makes it impossible to continuously treat the sewage, thereby reducing the treatment efficiency. Summary of the invention

[0004] The object of the present invention is to provide a municipal water supply and drainage sewage pretreatment device and method, which aims to enable the sewage to be stirred, mixed and filtered multiple times during flow through the provision of multi-stage partitions and mesh plates, thereby continuously treating the sewage and improving work efficiency.

[0005] To achieve the above-mentioned objectives, in a first aspect, the present invention provides a municipal water supply and drainage sewage pretreatment device, comprising a treatment box, an inlet pipe, an outlet pipe, a reaction component, a plurality of partitions, a plurality of mesh plates and a sedimentation box, wherein the inlet pipe and the outlet pipe are arranged on the treatment box, and a plurality of the partitions are alternately arranged in the treatment box so that the water flows in an S shape, the reaction component comprises a feeding box, a distribution pipe and a stirring rod group, the distribution pipe has a plurality of discharge holes, the distribution pipe is arranged above the partition, the stirring rod group is arranged on one side of the distribution pipe, the mesh plate is arranged on one side of the stirring rod group, and the sedimentation box is arranged at the bottom of the treatment box.

[0006] Among them, the feeding box includes a box body, a pressure pump, a pressure sensor and a liquid level sensor. The pressure pump is arranged on one side of the box body, the pressure sensor is arranged on the box body for detecting the pressure value in the box body, and the liquid level sensor is used to detect the liquid level height in the box body.

[0007] The stirring rod comprises a stirring rod body, a stirring blade and a stirring motor. The stirring rod body is rotatably arranged on one side of the partition. The stirring blade is fixed on the stirring rod body. The output end of the stirring motor is connected to the stirring rod body.

[0008] Among them, the mesh plate includes a mesh plate body, a spring, a first permanent magnet and a first electromagnet. The mesh plate body is rotatably arranged in the box and is located between two adjacent staggered partitions. The first permanent magnet is fixed on the mesh plate body. The first electromagnet is arranged on one side of the first permanent magnet. The spring is used to reset the mesh plate body. The first electromagnet is periodically energized to drive the mesh plate body to shake.

[0009] Wherein, the mesh plate further comprises a sealing strip, which is fixed on the mesh plate body and is located between the mesh plate body and the processing box.

[0010] Wherein, the sedimentation box comprises a box body, a discharge pipe and a valve, the discharge pipe is fixed on one side of the box body, and the valve is arranged on the discharge pipe.

[0011] Wherein, the municipal water supply and drainage sewage pretreatment equipment also includes a sedimentation processor, and the sedimentation processor is used to clean the impurities in the box body.

[0012] In a second aspect, the present invention also provides a method for using a municipal water supply and drainage sewage pretreatment device, comprising: flowing the filtered sewage into a treatment tank through a water inlet pipe;

[0013] The sewage flows along an S-shaped path under the partitions of multiple baffles;

[0014] The reaction liquid is discharged from the plurality of discharge holes through the distribution pipe by the feed box, and then stirred and mixed by the stirring rod group to obtain a reaction precipitate, and the reaction precipitate is filtered through a mesh plate;

[0015] The reaction precipitate enters the precipitation box for collection;

[0016] The sewage after multi-stage filtration is discharged through the outlet pipe.

[0017] The municipal water supply and drainage sewage pretreatment equipment and method of the present invention, the treatment box carries the whole process from the sewage entering to the completion of preliminary purification. The water inlet pipe and the water outlet pipe are respectively arranged on both sides of the treatment box to ensure that the sewage can flow in smoothly and be discharged after treatment. In order to effectively filter out larger impurities in the sewage, the filter assembly is specially arranged on one side of the water inlet pipe. A plurality of partitions are arranged inside the treatment box, and these partitions are installed in an alternating arrangement so that the water flows in an S-shaped path in the box. This design not only increases the residence time of the sewage in the treatment box, but also provides more time and space for various physical and chemical reactions, thereby improving the removal efficiency of pollutants. The feed box of the reaction assembly is used to store chemical agents, which are evenly released into the sewage through a plurality of discharge holes on the distribution pipe. The distribution pipe is located above the partition to ensure that the agent and the sewage are fully mixed. Adjacent to one side of the distribution pipe is a stirring rod group, which is used to accelerate the mixing process between the agent and the sewage, promote the progress of the chemical reaction, and improve the purification effect. A mesh plate is also provided on one side of the stirring rod group to further screen and filter fine suspended matter in the water to ensure the cleanliness of the water quality. Finally, a sedimentation box is provided at the bottom of the treatment tank to collect and store the solid waste and sludge that settles after the above treatment steps, so as to facilitate subsequent cleaning and disposal.

[0018] In summary, this municipal water supply and drainage sewage pretreatment equipment achieves efficient pretreatment of sewage by combining and using multiple functional components, laying a good foundation for subsequent deep purification treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 work.

[0020] Figure 1 It is a structural diagram of a municipal water supply and drainage sewage pretreatment device of the present invention.

[0021] Figure 2 It is the right side structural diagram of a municipal water supply and drainage sewage pretreatment device of the present invention.

[0022] Figure 3 It is a cross-sectional structural diagram of a municipal water supply and drainage sewage pretreatment device of the present invention.

[0023] Figure 4 yes Figure 3 A partial enlargement of detail A.

[0024] Figure 5 yes Figure 3A partial enlargement of detail B.

[0025] Figure 6 The present invention is a flow chart of a method for pre-treating municipal water supply and drainage sewage.

[0026] Processing box 101, water inlet pipe 102, water outlet pipe 103, reaction component 104, partition 105, mesh plate 106, sedimentation box 107, feeding box 108, distribution pipe 109, stirring rod group 110, discharge hole 111, box body 112, pressure pump 113, pressure sensor 114, liquid level sensor 115, stirring rod body 116, stirring blade 117, stirring motor 118, mesh plate body 119, spring 120, first permanent magnet 121, first electromagnet 122, box body 124, discharge pipe 125, valve 126, sedimentation processor 127, limit block 128, adjusting screw 129, baffle 130, second permanent magnet 131, second electromagnet 132, moving rod 133, scraper 134, transmission belt 135. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0029] First embodiment

[0030] See also Figure 1 to Figure 5The present invention provides a municipal water supply and drainage sewage pretreatment device, including a treatment box 101, an inlet pipe 102, an outlet pipe 103, a reaction component 104, a plurality of partitions 105, a plurality of mesh plates 106 and a sedimentation box 107, wherein the inlet pipe 102 and the outlet pipe 103 are arranged on the treatment box 101, and a plurality of the partitions 105 are alternately arranged in the treatment box 101 so that the water flows in an S shape, the reaction component 104 includes a feeding box 108, a distribution pipe 109 and a stirring rod group 110, the distribution pipe 109 has a plurality of discharge holes 111, the distribution pipe 109 is arranged above the partition 105, the stirring rod group 110 is arranged on one side of the distribution pipe 109, the mesh plate 106 is arranged on one side of the stirring rod group 110, and the sedimentation box 107 is arranged at the bottom of the treatment box 101.

[0031] In this embodiment, the treatment box 101 carries the whole process from the entry of sewage to the completion of preliminary purification. The water inlet pipe 102 and the water outlet pipe 103 are respectively arranged on both sides of the treatment box 101 to ensure that the sewage can flow in smoothly and be discharged after treatment. In order to effectively filter out larger impurities in the sewage, the filter assembly is specially placed on one side of the water inlet pipe 102. A plurality of partitions 105 are arranged inside the treatment box 101, and these partitions 105 are installed in an alternating arrangement so that the water flows in an S-shaped path in the box body 112. This design not only increases the residence time of the sewage in the treatment box 101, but also provides more time and space for various physical and chemical reactions, thereby improving the removal efficiency of pollutants. The feed box 108 of the reaction assembly 104 is used to store chemical agents, which are evenly released into the sewage through the plurality of discharge holes 111 on the distribution pipe 109, and the distribution pipe 109 is located above the partition 105 to ensure that the agent is fully mixed with the sewage. Adjacent to one side of the distribution pipe 109 is a stirring rod group 110, which is used to accelerate the mixing process between the reagent and the sewage, promote the chemical reaction, and improve the purification effect.

[0032] In addition, a mesh plate 106 is provided on one side of the stirring rod group 110 to further screen and filter fine suspended matter in the water to ensure the cleanliness of the water. Finally, a sedimentation box 107 is provided at the bottom of the treatment box 101 to collect and store solid waste and sludge settled after the above treatment steps for subsequent cleaning and disposal.

[0033] In summary, this municipal water supply and drainage sewage pretreatment equipment achieves efficient pretreatment of sewage through ingenious design and combined use of multiple functional components, laying a good foundation for subsequent deep purification treatment.

[0034] The feeding box 108 includes a box body 112, a pressure pump 113, a pressure sensor 114 and a liquid level sensor 115. The pressure pump 113 is arranged on one side of the box body 112, the pressure sensor 114 is arranged on the box body 112, and is used to detect the pressure value in the box body 112. The liquid level sensor 115 is used to detect the liquid level in the box body 112.

[0035] The box 112 is used as a container for storing chemicals, ensuring the safe storage of the chemicals and providing a basis for subsequent distribution. The pressure pump 113 is arranged on one side of the box 112. Its main function is to ensure that the chemicals can be smoothly transported from the box 112 through the distribution pipe 109 to the sewage treatment area by providing appropriate pressure. In order to monitor the working status inside the box 112, a pressure sensor 114 and a liquid level sensor 115 are specially configured. The pressure sensor 114 is installed on the box 112 and can detect the pressure value inside the box 112 in real time to ensure the stability and safety of the agent delivery process; while the liquid level sensor 115 is responsible for monitoring the liquid level in the box 112 to ensure sufficient supply of the agent and prevent poor treatment effects due to insufficient or excessive amounts of the agent.

[0036] The stirring rod includes a stirring rod body 116 , a stirring blade 117 and a stirring motor 118 . The stirring rod body 116 is rotatably arranged on one side of the partition 105 . The stirring blade 117 is fixed on the stirring rod body 116 . The output end of the stirring motor 118 is connected to the stirring rod body 116 .

[0037] The stirring rod group 110 consists of three main parts: a stirring rod body 116, a stirring blade 117 and a stirring motor 118. The stirring rod body 116 is rotatably arranged on one side of the partition 105 so that it can rotate freely in a designated space. The stirring blade 117 is fixed to the stirring rod body 116 and moves with the rotation of the stirring rod body 116, effectively stirring the mixture of sewage and medicine to achieve uniform mixing. The stirring motor 118 is the power source of the entire stirring rod group 110, and its output end is directly connected to the stirring rod body 116. The stirring rod body 116 and the stirring blade 117 thereon are driven by the motor to rotate at high speed, thereby achieving the purpose of rapid and uniform stirring.

[0038] The mesh plate 106 includes a mesh plate body 119, a spring 120, a first permanent magnet 121 and a first electromagnet 122. The mesh plate body 119 is rotatably arranged in the box body 112 and is located between two adjacent staggered partitions 105. The first permanent magnet 121 is fixed on the mesh plate body 119. The first electromagnet 122 is arranged on one side of the first permanent magnet 121. The spring 120 is used to reset the mesh plate body 119. The first electromagnet 122 is periodically energized to drive the mesh plate body 119 to vibrate.

[0039] The mesh body 119 is rotated and arranged inside the treatment box 101, and is deliberately placed between two adjacent and staggered partitions 105. Such a position selection not only maximizes the use of space, but also ensures that the water can be effectively filtered when it passes through. In order to enhance the functionality and adaptability of the mesh 106, a first permanent magnet 121 is fixed to the mesh body 119. At the same time, the first electromagnet 122 is installed on one side of the first permanent magnet 121 and interacts with the permanent magnet through the electromagnetic effect. This design allows the first electromagnet 122 to be energized periodically, generating a change in the magnetic field, thereby causing the mesh body 119 to vibrate slightly, effectively preventing the accumulation of fine particulate matter on the mesh 106 and maintaining its long-term and efficient filtering performance.

[0040] In addition, the spring 120 is also cleverly used in this system to reset the screen body 119. Whenever the first electromagnet 122 is powered off, the spring 120 will work to restore the screen body 119 to its initial position, ready for the next shaking. This reciprocating operation enables the screen 106 to achieve a self-cleaning function without adding additional power, greatly improving the overall efficiency and reliability of the device.

[0041] The mesh plate 106 further includes a sealing strip, which is fixed on the mesh plate body 119 and is located between the mesh plate body 119 and the processing box 101 .

[0042] In order to ensure the sealing during the treatment process and reduce the risk of leakage, a sealing strip is also fixed at the edge of the mesh body 119. The sealing strip is located between the mesh body 119 and the treatment box 101 to ensure a close fit between the two and prevent untreated sewage from bypassing the mesh 106 directly through the gap.

[0043] The sedimentation box 107 includes a box body 124 , a discharge pipe 125 and a valve 126 . The discharge pipe 125 is fixed on one side of the box body 124 , and the valve 126 is disposed on the discharge pipe 125 .

[0044] As the core part of the sedimentation box 107, the box body 124 provides a special space to accommodate solid particles separated from sewage, such as silt, suspended matter, etc. These solid substances naturally settle to the bottom of the box body 124 when the water flow speed slows down, thereby achieving solid-liquid separation. The design of the box body 124 takes into account the capacity and cleaning convenience to meet the needs of sewage treatment of different scales. In order to facilitate the regular removal of solid waste and sludge accumulated in the sedimentation box 107, a discharge pipe 125 is fixedly set on one side of the box body 124. The discharge pipe 125 not only provides a channel for the discharge of solid waste, but also connects to the subsequent waste treatment or disposal system to ensure that the waste can be properly handled without polluting the environment. A valve 126 is provided on the discharge pipe 125, which is a key component for controlling the discharge of solid waste. The valve 126 allows the operator to manually or automatically control the discharge process according to actual needs, which can not only discharge waste at an appropriate time, but also prevent untreated sewage from flowing back into the sedimentation box 107 through the discharge pipe 125 to avoid secondary pollution.

[0045] The municipal water supply and drainage sewage pretreatment equipment further includes a sedimentation processor 127 , and the sedimentation processor 127 is used to clean the impurities in the box body 124 .

[0046] The core of the sedimentation processor 127 is that it can effectively move the scraper to clean the impurities in the sedimentation box 107.

[0047] The sedimentation processor 127 includes a moving rod 133, a scraper 134, a transmission belt 135, a limit block 128 and an adjusting screw 129. The transmission belt 135 is rotatably arranged on one side of the box body 124, the moving rod 133 is fixed to the transmission belt 135, the scraper 134 is rotatably arranged on the moving rod 133, the limit block 128 is slidably arranged on the moving rod 133 and is located on one side of the scraper 134, and the adjusting screw 129 is rotatably connected to the moving rod 133 and is threadedly connected to the limit block 128.

[0048] The movement of the transmission belt 135 can drive the moving rod 133 to move, so that the moving rod 133 can drive the scraper 134 to move along the bottom of the box body 124 to scrape the sediment, making it more convenient to collect the sediment, wherein the limit block 128 limits the rotation direction of the scraper 134, so that the scraper 134 is supported by the limit block 128 when scraping, and the scraper 134 can be lifted up under the water flow resistance when resetting to avoid scraping impurities to the other side, and the position of the limit block 128 can be adjusted by the adjusting screw 129 to adjust the inclination angle of the scraper 134.

[0049] The precipitation processor 127 also includes a baffle 130 , a second permanent magnet 131 and a second electromagnet 132 . The baffle 130 is rotatably disposed on the moving rod 133 , the second permanent magnet 131 is fixed on the baffle 130 , and the second electromagnet 132 is disposed on one side of the box body 124 .

[0050] In order to prevent impurities from falling into places that the scraper 134 cannot clean, the present application is provided with the baffle 130. Through the cooperation of the second permanent magnet 131 and the second electromagnet 132 on the baffle 130, the space on the right side of the moving rod can be blocked to prevent impurities from falling in.

[0051] Second embodiment

[0052] See also Figure 6 The present invention also provides a method for using a municipal water supply and drainage sewage pretreatment device, comprising:

[0053] S201 allows the filtered sewage to flow into the treatment box 101 through the water inlet pipe 102;

[0054] The sewage to be treated will be initially filtered to remove larger impurities before entering the municipal water supply and drainage sewage pretreatment equipment. The initially filtered sewage is then guided into the treatment box 101 through the water inlet pipe 102. This process ensures that the subsequent treatment components will not be damaged or reduced in efficiency due to the presence of large particles.

[0055] S202 sewage flows along an S-shaped path under the partition of multiple partitions 105;

[0056] Once the sewage enters the treatment tank 101, it will flow along the designed S-shaped path under the guidance of multiple partitions 105. This special flow method increases the residence time of the sewage in the treatment tank 101, provides more time and space for various physical and chemical reactions, and helps to improve the removal rate of pollutants. At the same time, this method can also make the sewage and the treatment agent mix better, further enhancing the treatment effect.

[0057] S203: The reaction liquid is discharged from the plurality of discharge holes 111 through the feed box 108 through the distribution pipe 109, and then stirred and mixed through the stirring rod group 110 to obtain a reaction precipitate, and the reaction precipitate is filtered through the mesh plate 106;

[0058] According to the specific needs of sewage treatment, the feed box 108 will add corresponding chemical agents to the sewage. These agents are evenly released into the sewage through multiple discharge holes 111 on the distribution pipe 109. In order to ensure that the agent is fully mixed with the sewage, a stirring rod group 110 is provided. The stirring motor 118 drives the stirring rod body 116 and the stirring blades 117 thereon to rotate, thereby quickly and evenly mixing the sewage and the agent, promoting the occurrence of chemical reactions, and forming reaction precipitates. In this process, the mesh plate 106 plays a key role. It can screen and filter out fine suspended matter in the water and the generated reaction precipitates to ensure the cleanliness of the water quality.

[0059] S204 The reaction precipitate enters the precipitation box 107 for collection;

[0060] The reaction precipitate filtered by the mesh plate 106 will settle to the bottom of the treatment tank 101 and will eventually be collected in the sedimentation box 107. The design of the sedimentation box 107 takes into account the capacity and cleaning convenience so that the accumulated solid waste and sludge can be regularly removed to ensure the continuous and efficient operation of the treatment system.

[0061] S205 The sewage after multi-stage filtration is discharged through the outlet pipe 103.

[0062] After the above-mentioned multi-stage treatment steps, the sewage has been significantly purified. At this time, the purified water flows out of the treatment box 101 through the outlet pipe 103, ready to enter the next stage of deep treatment or directly discharged into the environment to ensure that it meets environmental protection standards.

[0063] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A municipal water supply and drainage sewage pretreatment device, comprising a treatment box, an inlet pipe and an outlet pipe, wherein the inlet pipe and the outlet pipe are arranged on the treatment box, characterized in that: It also includes a reaction component, multiple partitions, multiple mesh plates and a sedimentation box. The multiple partitions are alternately arranged in the treatment box so that the water flows in an S shape. The reaction component includes a feeding box, a distribution pipe and a stirring rod group. The distribution pipe has multiple discharge holes. The distribution pipe is arranged above the partition, the stirring rod group is arranged on one side of the distribution pipe, the mesh plate is arranged on one side of the stirring rod group, and the sedimentation box is arranged at the bottom of the treatment box.

2. A municipal water supply and drainage sewage pretreatment equipment as claimed in claim 1, characterized in that: The feeding box includes a box body, a pressure pump, a pressure sensor and a liquid level sensor. The pressure pump is arranged on one side of the box body, the pressure sensor is arranged on the box body and is used to detect the pressure value in the box body, and the liquid level sensor is used to detect the liquid level in the box body.

3. A municipal water supply and drainage sewage pretreatment equipment as claimed in claim 2, characterized in that: The stirring rod comprises a stirring rod body, a stirring blade and a stirring motor. The stirring rod body is rotatably arranged on one side of the partition, the stirring blade is fixed on the stirring rod body, and the output end of the stirring motor is connected to the stirring rod body.

4. A municipal water supply and drainage sewage pretreatment device as claimed in claim 3, characterized in that: The mesh plate includes a mesh plate body, a spring, a first permanent magnet and a first electromagnet. The mesh plate body is rotatably arranged in the box and is located between two adjacent staggered partitions. The first permanent magnet is fixed on the mesh plate body. The first electromagnet is arranged on one side of the first permanent magnet. The spring is used to reset the mesh plate body. The first electromagnet is periodically energized to drive the mesh plate body to vibrate.

5. A municipal water supply and drainage sewage pretreatment device as claimed in claim 4, characterized in that: The mesh plate further comprises a sealing strip, which is fixed on the mesh plate body and is located between the mesh plate body and the processing box.

6. A municipal water supply and drainage sewage pretreatment device as claimed in claim 5, characterized in that: The sedimentation box comprises a box body, a discharge pipe and a valve. The discharge pipe is fixed on one side of the box body, and the valve is arranged on the discharge pipe.

7. A municipal water supply and drainage sewage pretreatment device as claimed in claim 6, characterized in that: The municipal water supply and drainage sewage pretreatment equipment also includes a sedimentation processor, which is used to clean the impurities in the box body.

8. A method for using a municipal water supply and drainage sewage pretreatment device, using the municipal water supply and drainage sewage pretreatment device according to any one of claims 1 to 7, It is characterized in that It includes: the filtered sewage flows into the treatment tank through the water inlet pipe; The sewage flows along an S-shaped path under the partitions of multiple baffles; The reaction liquid is discharged from the plurality of discharge holes through the distribution pipe by the feed box, and then stirred and mixed by the stirring rod group to obtain a reaction precipitate, and the reaction precipitate is filtered through a mesh plate; The reaction precipitate enters the precipitation box for collection; The sewage after multi-stage filtration is discharged through the outlet pipe.

Images