Advanced wastewater treatment and energy recovery system

Abstract

The invention relates to a wastewater advanced treatment and energy recovery system which comprises a membrane filtration device, an activated carbon filtration device, an ion exchange membrane device and a reverse osmosis device which are connected in sequence, a plurality of layers of membrane filtration assemblies are uniformly arranged in the membrane filtration device, and the membrane filtration assemblies are perpendicular to the water flow direction in the membrane filtration device; an activated carbon filter bed and a plurality of first energy recovery bins are arranged in the activated carbon filter device; through holes are uniformly and densely distributed in the surface of the first energy recovery bin, and two ends of the first energy recovery bin are respectively connected with a booster pump inlet and an energy recovery branch pipe; the system further comprises a second energy recovery bin, the second energy recovery bin is provided with a water distribution header pipe and a plurality of water distribution pipes which are connected with each other, the energy recovery header pipe and a water production pipe of the reverse osmosis device are connected with the water distribution header pipe, and energy gathering devices are arranged on the water distribution pipes. And cleaning water is prepared in the second energy recovery bin and is used for cleaning the membrane material of the system.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment, and in particular relates to a wastewater deep treatment and energy recovery system. Background Art

[0002] Deep wastewater treatment usually refers to the deep purification of wastewater after pretreatment and biochemical treatment, so as to deeply remove residual suspended matter, COD, color, ions and other pollutants in the wastewater, so that it can reach higher water quality standards such as reused reclaimed water or even pure water.

[0003] At present, the deep treatment of wastewater mainly adopts multi-media filtration combined with membrane treatment, such as ultrafiltration, nanofiltration, RO reverse osmosis, EDI electric drive membrane and ion exchange membrane and their combined treatment processes. However, the above membrane treatment process often has the problem of low treatment efficiency, and often needs to adopt high energy consumption such as high pressure and high flow rate, so that the treated wastewater still contains a large amount of residual energy, which is often not recovered and utilized, but lost in vain, resulting in a waste of energy resources. Summary of the invention

[0004] In view of the above problems, the present invention provides a wastewater deep treatment and energy recovery system, comprising a membrane filtration device, an activated carbon filtration device, an ion exchange membrane device and a reverse osmosis device connected in sequence, wherein a plurality of layers of membrane filtration components are evenly arranged in the membrane filtration device, and the membrane filtration components are perpendicular to the water flow direction in the membrane filtration device;

[0005] An activated carbon filter bed and a plurality of first energy recovery bins are provided in the activated carbon filter device. The surface of the first energy recovery bin is evenly and densely covered with through holes. The two ends of the first energy recovery bin are respectively connected to the inlet of the booster pump and the energy recovery branch pipe. The water body input into the activated carbon filter device by the membrane filter device has energy. After passing through the activated carbon filter bed, the water body can enter the first energy recovery bin and be recovered by the booster pump and the energy recovery branch pipe.

[0006] The system also includes a second energy recovery bin, which is provided with a water distribution main and a plurality of water distribution pipes that are interconnected. The energy recovery main and the water production pipe of the reverse osmosis device are connected to the water distribution main. An energy gathering device is provided on the water distribution pipe. After the energy-carrying water is increased in energy by the energy gathering device, it is used to configure cleaning water in the second energy recovery bin for cleaning the membrane materials of the membrane filtration device, the ion exchange membrane device and the reverse osmosis device.

[0007] Optionally, the membrane filtration device is a closed chamber, preferably in a square shape; a water inlet pipe and a water outlet pipe are respectively arranged on the front and rear sides of the membrane filtration device, for inputting wastewater and outputting filtered water respectively; the water inlet pipe is connected to a pressurizing device to pressurize the incoming water so that the wastewater can pass through each layer of the membrane filtration assembly;

[0008] The left and right sides of the membrane filter device are respectively provided with fixing devices. The fixing devices are a pair and are respectively arranged at corresponding positions on the left and right sides to support the two ends of the membrane filter assembly so that the membrane filter assembly is parallel to the front side of the membrane filter device.

[0009] Further optionally, the membrane filtration assembly includes a membrane material and a support plate parallel to each other, one side of the membrane material faces the front side of the membrane filtration device, the other side of the membrane material contacts one side of the support plate, and the other side of the support plate faces the rear side of the membrane filtration device; the support plate is evenly and densely distributed with through holes, so that the wastewater is filtered twice through the membrane material and the support plate when passing through each membrane filtration assembly.

[0010] Optionally, the activated carbon filter device is uniformly filled with activated carbon to form an activated carbon filter bed, and a number of first energy recovery bins are evenly buried in the activated carbon filter bed; the interior of the first energy recovery bin is hollow, and the sides are evenly covered with through holes, so that water passing through the activated carbon filter bed can enter and exit the first energy recovery bin; the first energy recovery bin is cylindrical, and its central axis is horizontal.

[0011] Optionally, the first energy recovery bin includes a left sub-bin and a right sub-bin, both of which are cylindrical, and the central axes of the two are horizontal, the connection between the left sub-bin and the right sub-bin is the vertex of the first energy recovery bin, the left sub-bin and the right sub-bin have an angle of 90-180°, the vertex points to the upstream side of the activated carbon filter device, and the internal spaces of the left sub-bin and the right sub-bin are connected.

[0012] Further optionally, the end of the left sub-compartment opposite to the apex is a left connecting end, and the end of the right sub-compartment opposite to the apex is a right connecting end, the right connecting end is connected to the energy recovery branch pipe, the energy recovery branch pipe is parallel to the right sub-compartment, the energy recovery branch pipes of each first energy recovery compartment are connected in parallel and then connected to the energy recovery main pipe, the water outlet of the energy recovery main pipe is connected to the water inlet pipe and the water distribution main pipe of the membrane filtration device; the left connecting end of each first energy recovery compartment is connected in parallel to the inlet of the booster pump;

[0013] The inner diameter of the left connecting end gradually decreases along the direction pointing to the boosting pump; the inner diameter of the right connecting end gradually decreases along the direction pointing to the energy recovery main pipe, which is beneficial to further increase the flow rate of water discharged from both ends of the first energy recovery tank.

[0014] Further optionally, the outer side of the left sub-compartment is sleeved with two first support rings, which are respectively arranged close to the two ends of the left sub-compartment and do not contact the outer side surface of the left sub-compartment; a plurality of first stirring members are evenly arranged along the circumference of the left sub-compartment, the first stirring member is rectangular, the two ends of one long side are respectively fixed on the two first support rings, and the other long side points to the inside of the activated carbon filter bed; the first stirring member is a mesh woven with steel wires staggered horizontally and vertically, and the mesh aperture is larger than the activated carbon particle size;

[0015] The first supporting ring near the left connecting end is connected to a driving motor for driving the first stirring member to rotate.

[0016] Further optionally, the outer side of the right sub-compartment is sleeved with two second support rings, which are respectively arranged close to the two ends of the right sub-compartment and do not contact the outer side of the right sub-compartment; a plurality of second stirring members are evenly arranged along the circumference of the right sub-compartment, the second stirring member is rectangular, the two ends of one long side are respectively fixed on the two second support rings, and the other long side points to the inside of the activated carbon filter bed; on the outer side of the right sub-compartment, the second stirring member is a mesh woven with steel wires staggered horizontally and vertically, and the mesh aperture is larger than the activated carbon particle size;

[0017] The second supporting ring near the right connecting end is connected to a driving motor for driving the second stirring member to rotate.

[0018] Optionally, a water distribution main pipe and a reagent inlet are provided at the top of the second energy recovery bin, a cleaning water outlet is provided at the bottom, the top ends of a plurality of water distribution pipes are evenly connected to both sides of the water distribution main pipe along the length direction of the water distribution main pipe, the bottom ends of the water distribution pipes extend into the lower part of the second energy recovery bin, the energy gathering device is above the liquid level of the second energy recovery bin, and the reagent inlet is connected to an external reagent box;

[0019] The cleaning water outlet is connected to the inlet of the cleaning water pump of the membrane filtration device, the ion exchange membrane device and the reverse osmosis device.

[0020] Further optionally, the energy gathering device includes an energy gathering chamber and a plurality of drainage pipes, the water distribution pipe runs through the energy gathering chamber, and the internal space of the energy gathering chamber is connected with the internal space of the water distribution pipe, the energy gathering chamber is a truncated cone with a larger upper portion and a smaller lower portion, and the plurality of drainage pipes are evenly arranged along the circumference of the energy gathering chamber;

[0021] One end of the drainage tube is connected to the energy-gathering chamber, and the opening of the other end faces downward to introduce outside air into the energy-gathering chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the wastewater deep treatment and energy recovery system of Example 1;

[0023] Figure 2 is a schematic diagram of a membrane filtration assembly;

[0024] Figure 3 is a schematic diagram of a second energy recovery chamber;

[0025] Figure 4 is a schematic diagram of an energy-gathering device;

[0026] Figure 5 is a schematic diagram of a first energy recovery chamber of Example 2;

[0027] Figure 6 Schematic diagram of the positional relationship between the left sub-compartment central axis and the right sub-compartment central axis of Example 4.

[0028] In the accompanying drawings, 1-membrane filtration device, 2-activated carbon filtration device, 3-ion exchange membrane device, 4-reverse osmosis device, 5-membrane filtration assembly, 6-activated carbon filter bed, 7-first energy recovery bin, 8-second energy recovery bin, 9-boosting pump, 10-energy recovery branch pipe, 11-energy recovery main pipe, 12-water distribution main pipe, 13-water distribution pipe, 14-fixing device, 15-membrane material, 16-support plate, 17-cleaning water outlet, 18-energy gathering chamber, 19-drainage pipe, 20-left branch chamber, 21-right branch chamber, 22-left connecting end, 23-right connecting end, 24-first support ring, 25-second support ring, 26-first stirring member, 27-second stirring member. DETAILED DESCRIPTION

[0029] Example 1

[0030] This embodiment provides a wastewater deep treatment and energy recovery system, such as Figure 1-Figure 4 As shown, it includes a membrane filtration device 1, an activated carbon filtration device 2, an ion exchange membrane device 3 and a reverse osmosis device 4 connected in sequence, and three layers of membrane filtration components 5 are evenly arranged in the membrane filtration device 1, and the membrane filtration components 5 are perpendicular to the water flow direction in the membrane filtration device 1;

[0031] An activated carbon filter bed 6 and a plurality of first energy recovery bins 7 are provided in the activated carbon filter device 2. The surface of the first energy recovery bin 7 is evenly and densely covered with through holes. The two ends of the first energy recovery bin 7 are respectively connected to the inlet of the booster pump 9 and the energy recovery branch pipe 10. The water body input into the activated carbon filter device 2 by the membrane filter device 1 has energy. After passing through the activated carbon filter bed 6, the water body can enter the first energy recovery bin 7 and be recovered by the booster pump 9 and the energy recovery branch pipe 10.

[0032] The system also includes a second energy recovery bin 8, which is provided with a water distribution main pipe 12 and a plurality of water distribution pipes 13 that are interconnected. The energy recovery main pipe 11 and the water production pipe of the reverse osmosis device 4 are connected to the water distribution main pipe 12. The water distribution pipe 13 is provided with an energy gathering device. After the energy-carrying water is increased in energy by the energy gathering device, it is used to configure cleaning water in the second energy recovery bin 8 for cleaning the membrane materials of the membrane filtration device 1, the ion exchange membrane device 3 and the reverse osmosis device 4.

[0033] The membrane filtration device 1 is a closed chamber in a square shape; an inlet pipe and an outlet pipe are respectively arranged on the front and rear sides of the membrane filtration device 1, for inputting wastewater and outputting filtered water respectively; the inlet pipe is connected to a pressurizing device to pressurize the inlet water so that the wastewater can pass through each layer of the membrane filtration assembly 5;

[0034] The membrane filter device 1 is provided with fixing devices 14 on the left and right sides, and the fixing devices 14 are a pair, which are respectively provided at corresponding positions on the left and right sides, and are used to support both ends of the membrane filter assembly 5 so that the membrane filter assembly 5 is parallel to the front side of the membrane filter device 1. The water outlet pipe is connected to the activated carbon filter device 2.

[0035] The fixing device 14 is a U-shaped elongated slot and is vertically arranged to facilitate the insertion or extraction of the membrane filtration component 5 into or out of the fixing device 14 .

[0036] The membrane filtration assembly 5 includes a membrane material 15 and a support plate 16 which are parallel to each other, one side of the membrane material 15 faces the front side of the membrane filtration device 1, the other side of the membrane material 15 contacts one side of the support plate 16, and the other side of the support plate 16 faces the rear side of the membrane filtration device 1; the support plate 16 is evenly and densely covered with through holes, so that the wastewater is filtered twice by the membrane material 15 and the support plate 16 when passing through each membrane filtration assembly 5. The membrane material 15 can be made of a fluorocarbon fiber membrane with a pore size of 0.1-1 mm, and the pore size of the support plate 16 is 10-20 mm.

[0037] After being pressurized, the wastewater can pass through the multi-layer membrane filter assembly 5 of the membrane filter device 1, and the suspended particles in the wastewater body form a lava membrane thin layer and a filter medium layer on the surface of the membrane layer, thereby improving the filtering effect and fine particle filtering efficiency of the membrane filter assembly 5. The support plate 16 supports the membrane material on the downstream side of the membrane material, thereby improving the strength of the membrane layer, facilitating the formation of a dense medium layer, reducing the pollution and blockage of the membrane material itself during filtration, and improving the pollutant filtering and purification effect of the membrane filter device 1.

[0038] The activated carbon filter device 2 is uniformly filled with activated carbon to form an activated carbon filter bed 6, and a plurality of first energy recovery bins 7 are uniformly buried in the activated carbon filter bed 6; the first energy recovery bin 7 is hollow inside and has through holes uniformly distributed on the side, so that water passing through the activated carbon filter bed 6 can enter and exit the first energy recovery bin 7;

[0039] The first energy recovery bin 7 is a straight cylinder, the central axis of which is horizontal, and the two ends of the first energy recovery bin 7 are respectively in contact with two opposite side walls of the activated carbon filter device 2. The aperture of the through hole of the first energy recovery bin is smaller than the particle size of the granular activated carbon, so as to prevent the activated carbon from entering the first energy recovery bin and being lost.

[0040] The energy recovery branch pipe 10 is arranged horizontally, and the inlet is directed to the upstream side of the activated carbon filter device 2, so that water can flow into the energy recovery branch pipe 10; the energy recovery branch pipes 10 of each first energy recovery bin are connected in parallel and then connected to the energy recovery main pipe 11, and the water outlet of the energy recovery main pipe 11 is connected to the water inlet pipe and the water distribution main pipe 12 of the membrane filter device 1, so that the water with kinetic energy recovered by the first energy recovery bin is returned to the membrane filter device 1 and the second energy recovery bin 8, and the kinetic energy in the water is utilized;

[0041] One end of each first energy recovery bin close to the booster pump 9 is connected in parallel to the inlet of the booster pump 9 to provide water with kinetic energy to the booster pump 9. The inlet of the booster pump 9 is also horizontal and perpendicular to the energy recovery branch pipe 10.

[0042] The membrane filter device 1 has a certain pressure inside, and its outlet water also has pressure and energy. The water with energy enters the activated carbon filter bed 6, contacts and mixes with the granular activated carbon layer, and the activated carbon adsorbs and purifies the pollutants such as particles, ions, and particles in the water, and can also play a good effect on water purification while recovering energy. The water in the activated carbon filter device 2 can enter and exit the first energy recovery bin. When the water escapes evenly from the through hole of the first energy recovery bin, it contacts and fluidizes with the activated carbon, activating the tiny bubbles in the pores of the granular activated carbon, thereby forming a deep treatment effect similar to flotation separation for pollutants in the water, which can better remove colloids, particles and other pollutants in the water, forming a tiered and graded treatment to further improve the deep purification effect of water pollutants, and at the same time realize the tiered and graded full recovery and utilization of the residual kinetic energy.

[0043] At the same time, the water containing pressure and kinetic energy enters the first energy recovery tank. On the one hand, the water enters the inlet of the booster pump 9 and is used as the water inlet of the booster pump 9, thereby increasing the kinetic energy of the water inlet, achieving energy saving, and reducing the energy consumption of the booster pump 9. On the other hand, the water is recycled to the membrane filtration device 1 and the second energy recovery tank 8 through the energy recovery branch pipe 10 and the energy recovery main pipe 11.

[0044] The ion exchange membrane device 3 and the reverse osmosis device 4 of this embodiment adopt the conventional structure and setting in this field. The water production pipe of the reverse osmosis device 4 is connected to the water distribution main 12 and the water inlet pipe of the membrane filtration device 1, and can also be connected to the inlet of the cleaning water pump of the ion exchange membrane device 3 and the reverse osmosis device 4 to better clean the ion exchange membrane device 3 and the reverse osmosis device 4.

[0045] The top of the second energy recovery bin 8 is provided with a water distribution main pipe 12 and a reagent inlet, and the lower part is provided with a cleaning water outlet 17. The top ends of the four water distribution pipes 13 are evenly connected to both sides of the water distribution main pipe 12 along the length direction of the water distribution main pipe 12, and the bottom ends of the water distribution pipes 13 extend into the lower part of the second energy recovery bin 8. The energy gathering device is above the liquid level of the second energy recovery bin 8, and the reagent inlet is connected to an external reagent box; the bottom of the second energy recovery bin 8 is conical, which is convenient for collecting solid impurities contained in the water supply of the water distribution pipe 13;

[0046] The cleaning water outlet 17 is connected to the inlet of the cleaning water pump of the membrane filtration device 1 , the ion exchange membrane device 3 and the reverse osmosis device 4 .

[0047] The energy gathering device includes an energy gathering chamber 18 and two drainage pipes 19. The water distribution pipe 13 runs through the energy gathering chamber 18, and the internal space of the energy gathering chamber 18 is connected to the internal space of the water distribution pipe 13. The energy gathering chamber 18 is a truncated cone with a larger top and a smaller bottom. A plurality of drainage pipes 19 are evenly arranged along the circumference of the energy gathering chamber 18.

[0048] One end of the drainage tube 19 is connected to the energy gathering chamber 18 , and the other end is opened downward to introduce external air into the energy gathering chamber 18 .

[0049] The second energy recovery chamber 8 is used to configure the cleaning water for cleaning membrane materials. The water produced by the reverse osmosis device 4 and the water input by the energy recovery main pipe 11 contain energy. After these water and the reagent enter the second energy recovery chamber 8, the reagent can be mixed more quickly and efficiently under the action of the kinetic energy in the water, so as to realize energy recycling. After the water is evenly distributed by the water distribution main pipe 12, it enters each water distribution pipe 13. When the water flows through the energy collection chamber 18, the flow rate is fast, which will also drive the surrounding air to flow, thereby reducing the pressure nearby and forming suction for the outside air of the energy collection chamber 18. The outside air enters the energy collection chamber 18 through the drainage pipe 19, and the direction of air entry is the tangential direction. While the air and the water in the energy collection chamber 18 are quickly mixed, it also helps to form a rotating water flow, further increasing the kinetic energy of the water. At the same time, the shape of the energy collection chamber 18, which is large at the top and small at the bottom, can further increase the flow rate of the mixed flow of water and gas. After the mixed flow enters the second energy recovery chamber 8, it forms a forced turbulent mixing with the reagent, improves the mixing efficiency, and saves energy and reduces consumption. The water body input by the energy recovery main pipe 11 contains broken activated carbon residues, which can be gathered and deposited at the conical bottom of the second energy recovery bin 8.

[0050] The drainage pipe 19 may be in an inverted “V” shape or horizontal. The opening of the drainage pipe 19 faces downward, which can prevent larger solids or liquids (such as rainwater) falling from the air from entering the drainage pipe 19 .

[0051] Example 2

[0052] This embodiment provides a wastewater deep treatment and energy recovery system, which is the same as embodiment 1, except that: Figure 5 As shown, the first energy recovery bin includes a left sub-bin 20 and a right sub-bin 21. Both the left sub-bin 20 and the right sub-bin 21 are cylindrical, and the central axes of the two are horizontal. The connection between the left sub-bin 20 and the right sub-bin 21 is the vertex of the first energy recovery bin. The left sub-bin 20 and the right sub-bin 21 have an angle of 90-180°, and the vertex points to the upstream side of the activated carbon filter device 2. The internal spaces of the left sub-bin 20 and the right sub-bin 21 are connected.

[0053] The end of the left sub-compartment 20 opposite to the apex is the left connecting end 22, and the end of the right sub-compartment 21 opposite to the apex is the right connecting end 23. The right connecting end 23 is connected to the energy recovery branch pipe 10, and the energy recovery branch pipe 10 is parallel to the right sub-compartment 21. The energy recovery branch pipes 10 of each first energy recovery compartment are connected in parallel and then connected to the energy recovery main pipe 11. The water outlet of the energy recovery main pipe 11 is connected to the water inlet pipe of the membrane filtration device 1 and the water distribution main pipe 12; the left connecting end 22 of each first energy recovery compartment is connected in parallel to the inlet of the booster pump 9;

[0054] The inner diameter of the left connecting end 22 gradually decreases along the direction pointing to the booster pump 9; the inner diameter of the right connecting end 23 gradually decreases along the direction pointing to the energy recovery main pipe 11, which is conducive to further improving the flow rate of water discharged from both ends of the first energy recovery tank. The side walls of the left connecting end 22 and the right connecting end 23 are not provided with through holes and are solid plate surfaces.

[0055] The outer side of the left sub-chamber 20 is sleeved with two first support rings 24, which are respectively arranged near the two ends of the left sub-chamber 20 and do not contact the outer side of the left sub-chamber 20; a plurality of first stirring members 26 are evenly arranged along the circumference of the left sub-chamber 20, and the first stirring member 26 is rectangular, with the two ends of one long side respectively fixed on the two first support rings 24, and the other long side pointing to the inside of the activated carbon filter bed 6; the first stirring member 26 is a mesh woven with steel wires staggered horizontally and vertically, and the mesh aperture is larger than the activated carbon particle size;

[0056] The first support ring 24 near the left connecting end 22 is connected to a driving motor for driving the first stirring member 26 to rotate. The first support ring 24 is arranged concentrically with the left compartment 20.

[0057] The outer side of the right compartment 21 is sleeved with two second support rings 25, which are respectively arranged near the two ends of the right compartment 21 and do not contact the outer side of the right compartment 21; a plurality of second stirring members 27 are evenly arranged along the circumference of the right compartment 21, and the second stirring member 27 is rectangular, with the two ends of one long side respectively fixed on the two second support rings 25, and the other long side pointing to the inside of the activated carbon filter bed 6; the second stirring member 27 is a mesh woven with steel wires staggered horizontally and vertically, and the mesh aperture is larger than the activated carbon particle size;

[0058] The second support ring 25 near the right connecting end 23 is connected to a driving motor for driving the second stirring member 27 to rotate. The second support ring 25 is arranged concentrically with the right compartment 21. The two driving motors corresponding to the first support ring 24 and the second support ring 25 can be arranged inside or outside the activated carbon filter device 2.

[0059] The stirring parts of adjacent compartments do not touch each other to avoid collision.

[0060] The water in the activated carbon filter device 2 flows from the upstream side to the downstream side. The straight first energy recovery bin parallel to the upstream side hinders the water flow to a certain extent. After the water enters the first energy recovery bin, most of it flows out of the first energy recovery bin from the opposite side, and only a small part is utilized by the booster pump 9 and flows into the energy recovery branch pipe 10. To address these problems, the present embodiment provides a bent first energy recovery bin, in which the left bin 20 and the right bin 21 have an included angle to form an arrow shape, and the apex of the arrow points to the upstream side of the activated carbon filter device 2. After the water enters the left bin 20 and the right bin 21, it can flow along the left bin 20 or the right bin 21 to a certain extent, reducing the loss of water power and following the water flow, so that more water can flow to the boosting pump 9 and the energy recovery branch pipe 10. According to the amount of water flow required by the boosting pump 9 and the energy recovery branch pipe 10, the amount of water supplied to the boosting pump 9 and the energy recovery branch pipe 10 can be adjusted. For example, flow valves are respectively provided at the inlet of the boosting pump 9 and the inlet of the energy recovery branch pipe 10, so that the water not required by the boosting pump 9 and the energy recovery branch pipe 10 can still be discharged into the activated carbon filter bed 6.

[0061] The activated carbon filter bed 6 is filled with granular activated carbon. After a period of use, the bed will have channel flow, dead zones, etc., which will cause the wastewater to not flow evenly and consume the kinetic energy of the water body. The present invention sets a plurality of first stirring members 26 and second stirring members 27 outside the left sub-compartment 20 and the right sub-compartment 21. When the stirring members rotate, they can stir the surrounding granular activated carbon to achieve a loosening effect, which is beneficial to improve the accumulation of the bed and improve the filtration efficiency. The stirring member is mesh-shaped, which can reduce the rotation resistance while loosening the activated carbon, minimize the energy consumption of the driving motor, and avoid excessive flipping of the bed layer, resulting in uneven accumulation of the bed layer.

[0062] Example 3

[0063] This embodiment provides a wastewater deep treatment and energy recovery system, which is the same as Embodiment 2, except that a plurality of first accelerators are arranged inside the left sub-chamber 20, and the first accelerators are evenly arranged in a plurality of layers along the central axis of the left sub-chamber 20, each layer is parallel to the circular cross-section of the left sub-chamber 20, and a plurality of first accelerators are evenly arranged in each layer;

[0064] The first accelerator is in the shape of a cylinder with one end being large and the other end being small. The smaller end of the first accelerator points to the left connecting end 22, and the larger end points to the vertex.

[0065] A plurality of second accelerators are arranged inside the right compartment 21. The second accelerators are evenly arranged in a plurality of layers along the central axis of the right compartment 21. Each layer is parallel to the circular cross section of the right compartment 21. A plurality of second accelerators are evenly arranged in each layer.

[0066] The second accelerator is in the shape of a cylinder with one end being large and the other end being small. The smaller end of the second accelerator points to the right connecting end 23, and the larger end points to the vertex.

[0067] The water entering the left compartment 20 partially flows along the length direction of the left compartment 20, passes through each first accelerator to increase the water flow rate, compensates for the kinetic energy lost by the water due to the change of flow direction, and also increases the kinetic energy of the water, and then enters the booster pump 9 after the final acceleration at the left connecting end 22. The acceleration principle of the water in the right compartment 21 is the same as that of the left compartment 20 mentioned above. The design of the accelerator and the connecting end increases the water flow rate without increasing energy consumption. The number of accelerators and the size of the connecting end are determined according to the actual wastewater treatment situation.

[0068] The activated carbon filter bed 6 is provided with two types of first energy recovery bins including a left sub-bin 20 and a right sub-bin 21, one of which is a first energy recovery bin provided with an accelerator, called an accelerated recovery bin; the other is a first energy recovery bin without an accelerator, called an empty recovery bin;

[0069] Several layers of recovery bins are evenly arranged from the upstream side to the downstream side of the activated carbon filter device 2, and each layer has several accelerating recovery bins and empty recovery bins alternately arranged from top to bottom; the recovery bins of adjacent layers are staggered up and down, for example, the height of an accelerating recovery bin corresponds to the height between the accelerating recovery bin and the empty recovery bin adjacent to each other in the adjacent layer.

[0070] As a specific implementation method, three layers of recovery bins are evenly arranged from the upstream side to the downstream side of the activated carbon filter device 2, the first layer is close to the upstream side, the third layer is close to the downstream side, and the third layer is in the middle. The first layer is equipped with an accelerated recovery bin, an empty recovery bin, an accelerated recovery bin, and an empty recovery bin from top to bottom, and the upper and lower spacing between adjacent recovery bins is 2h; the second layer is equipped with an accelerated recovery bin, an empty recovery bin, an accelerated recovery bin, and an empty recovery bin from top to bottom, and the upper and lower spacing between adjacent recovery bins is 2h. The height of the first accelerated recovery bin of the second layer corresponds to the height between the upper two accelerated recovery bins and the empty recovery bin of the first layer; the third layer is equipped with an empty recovery bin, an accelerated recovery bin, an empty recovery bin, and an accelerated recovery bin from top to bottom, and the upper and lower spacing between adjacent recovery bins is 2h, and the height of each recovery bin on the third layer corresponds one by one to the height of each recovery bin on the first layer.

[0071] Since the first energy recovery bin is arranged horizontally in the activated carbon bed, the accelerator in the acceleration recovery bin also has a certain obstruction effect on the water body, and the obstruction effect of the empty recovery bin on the water body is almost negligible. The rotating stirring element can accelerate the water body to a certain extent and replenish kinetic energy. The present invention separates and alternately arranges the acceleration recovery bin and the empty recovery bin in the above form, so that the kinetic energy distribution of the water body in the activated carbon bed is more balanced, the loss is minimized, the water body energy is utilized, and the activated carbon filtering effect is improved.

[0072] Example 4

[0073] This embodiment provides a wastewater deep treatment and energy recovery system, which is the same as Embodiment 2, except that: Figure 6 As shown, the intersection of the central axis of the left compartment and the central axis of the right compartment is the central point, the straight line parallel to the upstream side of the activated carbon filter device where the central point is located is the standard line, and the angle between the central axis of the left compartment and the standard line is equal to the angle between the central axis of the right compartment and the standard line.

[0074] The ratio of the number of layers of the membrane filtration assembly in the membrane filtration device to the angle between the central axis of the left compartment and the standard line is 1:5, that is, the number of layers of the membrane filtration assembly is 5, the angle between the central axis of the left compartment and the standard line is 25°, and the angle between the central axis of the left compartment and the central axis of the right compartment is 130°.

[0075] The inventors have found that the more layers of membrane filtration components in the membrane filtration device, the greater the barrier effect on wastewater. The smaller the angle between the central axis of the left compartment and the central axis of the right compartment, the more it conforms to the flow direction of the water in the activated carbon bed, thereby reducing the kinetic energy loss of the water as much as possible.

[0076] Example 5

[0077] This embodiment provides a wastewater deep treatment and energy recovery system, which is the same as Embodiment 2, except that the ratio of the number of layers of the membrane filtration component in the membrane filtration device to the angle between the central axis of the left compartment and the standard line is 1:7, that is, the number of layers of the membrane filtration component is 5 layers, the angle between the central axis of the left compartment and the standard line is 35°, and the angle between the central axis of the left compartment and the central axis of the right compartment is 110°.

[0078] Example 6

[0079] This embodiment provides a wastewater deep treatment and energy recovery system, which is the same as Embodiment 2, except that the ratio of the number of layers of the membrane filtration component in the membrane filtration device to the angle between the central axis of the left compartment and the standard line is 1:4, that is, the number of layers of the membrane filtration component is 5 layers, the angle between the central axis of the left compartment and the standard line is 20°, and the angle between the central axis of the left compartment and the central axis of the right compartment is 140°.

[0080] Example 7

[0081] This embodiment provides a wastewater deep treatment and energy recovery system, which is the same as Embodiment 2, except that the ratio of the number of layers of the membrane filtration component in the membrane filtration device to the angle between the central axis of the left compartment and the standard line is 1:8, that is, the number of layers of the membrane filtration component is 5 layers, the angle between the central axis of the left compartment and the standard line is 40°, and the angle between the central axis of the left compartment and the central axis of the right compartment is 100°.

[0082] Table 1 Comparison of water kinetic energy in the energy recovery branch of the first energy recovery bin of Examples 4-7

[0083] project Water flow rate (cm / min) Example 4 80 Example 5 87 Example 6 70 Example 7 72

[0084] The proportional relationship between the number of layers of the membrane filtration assembly in the membrane filtration device and the angle between the central axis of the left compartment and the standard line determines the proportional relationship between the number of layers of the membrane filtration assembly and the angle between the central axis of the left compartment and the central axis of the right compartment. As can be seen from the above table, the smaller the angle between the central axis of the left compartment and the central axis of the right compartment, the greater the flow rate of the water in the energy recovery branch, and the more kinetic energy the water contains. However, if the angle between the central axis of the left compartment and the central axis of the right compartment is too small, the left compartment and the right compartment are too close, and more water in the activated carbon filter bed will not enter the first energy recovery compartment, which also leads to a decrease in the water flow rate of the energy recovery branch.

Claims

1. A wastewater deep treatment and energy recovery system, characterized in that: It includes a membrane filtration device, an activated carbon filtration device, an ion exchange membrane device and a reverse osmosis device connected in sequence, wherein a plurality of layers of membrane filtration components are evenly arranged in the membrane filtration device, and the membrane filtration components are perpendicular to the water flow direction in the membrane filtration device; An activated carbon filter bed and a plurality of first energy recovery chambers are provided in the activated carbon filter device. The surface of the first energy recovery chamber is evenly and densely covered with through holes. The two ends of the first energy recovery chamber are respectively connected to the inlet of the booster pump and the energy recovery branch pipe; The system also includes a second energy recovery bin, which is provided with a water distribution main and a plurality of water distribution pipes that are interconnected. The energy recovery main and the water production pipe of the reverse osmosis device are connected to the water distribution main. An energy gathering device is provided on the water distribution pipe. After the energy-carrying water is increased in energy by the energy gathering device, it is used to configure cleaning water in the second energy recovery bin for cleaning the membrane materials of the membrane filtration device, the ion exchange membrane device and the reverse osmosis device.

2. The wastewater deep treatment and energy recovery system according to claim 1 is characterized in that: The membrane filtration device is a closed chamber in a square shape; an inlet pipe and an outlet pipe are respectively arranged on the front and rear sides of the membrane filtration device, for inputting wastewater and outputting filtered water respectively; the inlet pipe is connected to a pressurizing device to pressurize the inlet water so that the wastewater can pass through each layer of the membrane filtration assembly; The left and right sides of the membrane filter device are respectively provided with fixing devices. The fixing devices are a pair and are respectively arranged at corresponding positions on the left and right sides to support the two ends of the membrane filter assembly so that the membrane filter assembly is parallel to the front side of the membrane filter device.

3. The wastewater deep treatment and energy recovery system according to claim 2 is characterized in that: The membrane filtration assembly includes a membrane material and a support plate parallel to each other, one side of the membrane material faces the front side of the membrane filtration device, the other side of the membrane material contacts one side of the support plate, and the other side of the support plate faces the rear side of the membrane filtration device; the support plate is evenly and densely covered with through holes, so that wastewater is filtered twice by the membrane material and the support plate when passing through each membrane filtration assembly.

4. The wastewater deep treatment and energy recovery system according to claim 1, characterized in that: The activated carbon filter device is uniformly filled with activated carbon to form an activated carbon filter bed, and a plurality of first energy recovery bins are uniformly buried in the activated carbon filter bed; the interior of the first energy recovery bin is hollow, and the sides are uniformly and densely covered with through holes, so that water passing through the activated carbon filter bed can enter and exit the first energy recovery bin; the first energy recovery bin is cylindrical, and its central axis is horizontal.

5. The wastewater deep treatment and energy recovery system according to claim 4 is characterized in that: The first energy recovery bin includes a left sub-bin and a right sub-bin, both of which are cylindrical, and the central axes of the two are horizontal. The connection between the left sub-bin and the right sub-bin is the vertex of the first energy recovery bin, and the left sub-bin and the right sub-bin have an angle of 90-180°, and the vertex points to the upstream side of the activated carbon filter device, and the internal spaces of the left sub-bin and the right sub-bin are connected.

6. The wastewater deep treatment and energy recovery system according to claim 5, characterized in that: The end of the left sub-compartment opposite to the apex is the left connection end, and the end of the right sub-compartment opposite to the apex is the right connection end. The right connection end is connected to the energy recovery branch pipe, which is parallel to the right sub-compartment. The energy recovery branch pipes of each first energy recovery compartment are connected in parallel and then connected to the energy recovery main pipe. The water outlet of the energy recovery main pipe is connected to the water inlet pipe of the membrane filtration device and the water distribution main pipe; the left connection end of each first energy recovery compartment is connected in parallel to the inlet of the booster pump; The inner diameter of the left connecting end gradually decreases along the direction pointing to the boosting pump; the inner diameter of the right connecting end gradually decreases along the direction pointing to the energy recovery main pipe, which is beneficial to further increase the flow rate of water discharged from both ends of the first energy recovery tank.

7. The wastewater deep treatment and energy recovery system according to claim 6, characterized in that: The outer side of the left sub-chamber is covered with two first support rings, which are respectively arranged near the two ends of the left sub-chamber and do not touch the outer side of the left sub-chamber; a plurality of first stirring members are evenly arranged along the circumference of the left sub-chamber, and the first stirring member is rectangular, with the two ends of one long side respectively fixed on the two first support rings, and the other long side pointing to the inside of the activated carbon filter bed; the first stirring member is a mesh woven with steel wires staggered horizontally and vertically, and the mesh aperture is larger than the activated carbon particle size; The first supporting ring near the left connecting end is connected to a driving motor for driving the first stirring member to rotate.

8. The wastewater deep treatment and energy recovery system according to claim 6, characterized in that: The outer side of the right sub-chamber is covered with two second support rings, which are respectively arranged near the two ends of the right sub-chamber and do not touch the outer side of the right sub-chamber; a plurality of second stirring members are evenly arranged along the circumference of the right sub-chamber, and the second stirring member is rectangular, with the two ends of one long side respectively fixed on the two second support rings, and the other long side pointing to the inside of the activated carbon filter bed; the second stirring member is a mesh woven with steel wires staggered horizontally and vertically, and the mesh aperture is larger than the activated carbon particle size; The second supporting ring near the right connecting end is connected to a driving motor for driving the second stirring member to rotate.

9. The wastewater deep treatment and energy recovery system according to claim 1, characterized in that: The top of the second energy recovery bin is provided with a water distribution main pipe and a reagent inlet, and the lower part is provided with a cleaning water outlet. The top ends of a plurality of water distribution pipes are evenly connected to both sides of the water distribution main pipe along the length direction of the water distribution main pipe, and the bottom ends of the water distribution pipes extend into the lower part of the second energy recovery bin. The energy gathering device is above the liquid level of the second energy recovery bin, and the reagent inlet is connected to an external reagent box. The cleaning water outlet is connected to the inlet of the cleaning water pump of the membrane filtration device, the ion exchange membrane device and the reverse osmosis device.

10. The wastewater deep treatment and energy recovery system according to claim 9, characterized in that: The energy gathering device includes an energy gathering chamber and a plurality of drainage pipes. The water distribution pipe runs through the energy gathering chamber, and the internal space of the energy gathering chamber is connected with the internal space of the water distribution pipe. The energy gathering chamber is in the shape of a truncated cone with a larger top and a smaller bottom. The plurality of drainage pipes are evenly arranged along the circumference of the energy gathering chamber. One end of the drainage pipe is connected to the energy gathering chamber, and the opening of the other end faces downward to introduce outside air into the energy gathering chamber.

Images