A precipitation-type air stripping filtration reaction equipment

Abstract

The present invention discloses a precipitation-type air stripping filtration reaction device, which includes a sand filter device, the bottom of which is filled with active filter material; an aerobic reaction device, which is arranged at least on one side of the sand filter device; and a sedimentation device, which is arranged downstream of the aerobic reaction device, and includes an air stripping mechanism and a liquid gathering and water distribution mechanism, wherein the air stripping mechanism connects the sedimentation device and the aerobic reaction device, and the liquid gathering and water distribution mechanism connects the sedimentation device and the sand filter device. The present invention reasonably distributes the aerobic reaction device, the sedimentation device, and the sand filter device within a limited space, thereby achieving multiple aeration, sedimentation, sand filtration, and water discharge operations within the corresponding area, integrating functions such as aerobic microbial decomposition and sedimentation sand filtration, thereby improving the sewage treatment capacity. The device occupies a small area and has a high volume utilization rate.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a precipitation-type air stripping filtering reaction device. Background Art

[0002] The active media filter is a continuous filtration equipment that integrates flocculation, clarification and filtration functions. It can ensure that filtration and sand washing can run simultaneously and can run continuously for 24 hours. The existing active media filter generally includes an aeration device, a sedimentation device and a sand washing device arranged in parallel. Each device is independently set up and connected by a water pipe. The active media filter of this structure requires a sedimentation tank and a sand filter with a large floor space for sludge sedimentation and sewage sand filtration. The overall floor space is large and the sewage treatment efficiency is low. Secondly, it needs to perform a sand filter backwash operation during the sand filtration process. When the sand filter backwash process is performed, the sand filtration needs to be stopped, which will directly affect the continuity and treatment efficiency of the sedimentation sand filtration. In addition, more water pumps need to be set up to promote water flow, which consumes a lot of energy. Summary of the Invention

[0003] In order to overcome the above technical problems, the present invention discloses a precipitation-type air stripping filtration reaction equipment.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0005] A precipitation-type air stripping filtration reaction device, comprising:

[0006] A sand filter device, the bottom of which is filled with active filter material;

[0007] an aerobic reaction device, disposed at least on one side of the sand filtration device;

[0008] The sedimentation device is arranged downstream of the aerobic reaction device, and includes an air stripping mechanism and a liquid gathering and water distribution mechanism. The air stripping mechanism connects the sedimentation device and the aerobic reaction device, and the liquid gathering and water distribution mechanism connects the sedimentation device and the sand filtration device.

[0009] In the above-mentioned sedimentation-type air stripping filtration reaction equipment, the sedimentation device includes a sedimentation mud hopper and a mud discharge pipe arranged at the bottom, a first aeration device is arranged in the sedimentation mud hopper, and the air stripping mechanism is correspondingly arranged above the first aeration device.

[0010] The above-mentioned sedimentation-type air stripping filtration reaction equipment, wherein the first aeration device includes a first microporous aeration ring tube, a second microporous aeration ring tube, and at least four groups of microporous aeration inclined tubes, and the circumference of the first microporous aeration ring tube is greater than the circumference of the second microporous aeration ring tube;

[0011] The first microporous aeration ring tube is fitted on the upper inner wall surface of the sedimentation mud hopper, the second microporous aeration ring tube is fitted on the lower inner wall surface of the sedimentation mud hopper, and the microporous aeration inclined tube connects the first microporous aeration ring tube and the second microporous aeration ring tube and is fitted on the inner wall surface of the sedimentation mud hopper.

[0012] The above-mentioned precipitation-type air stripping filtration reaction equipment, wherein the precipitation device also includes a flow pipe arranged at the bottom of the aerobic reaction device, the flow pipe connecting the aerobic reaction device and the precipitation device, and a trumpet-shaped dispersion cover is provided at the end of the flow pipe, and a reflector is correspondingly provided below the trumpet-shaped dispersion cover.

[0013] In the above-mentioned precipitation-type air stripping filtration reaction equipment, the precipitation device further includes a dosing pipeline, the dosing pipeline is connected to the overflow pipeline through a pipeline mixer, and the dosing pipeline is externally connected to a dephosphorization agent supply mechanism.

[0014] The above-mentioned sedimentation-type air stripping filtration reaction equipment, wherein the air stripping mechanism includes a return pipe, an air stripping pipe and a trumpet-shaped air collecting hood formed in sequence as one piece, the trumpet-shaped air collecting hood is correspondingly arranged above the first aeration device, the air stripping pipe connects the sedimentation device and the aerobic reaction device, the air stripping direction of the air stripping pipe is opposite to the water outlet direction of the return pipe, and the plane where the water outlet of the return pipe is located is parallel to the internal liquid level of the aerobic reaction device.

[0015] The above-mentioned precipitation-type air stripping filtration reaction equipment, wherein the liquid collecting and water distribution mechanism includes a liquid collecting pipe and several groups of water distribution pipes that are connected and arranged, the liquid collecting pipe connects the precipitation device and the sand filtration device and is arranged on the upper part of the precipitation device, the water distribution pipe is arranged on the liquid collecting pipe at an interval and inserted into the active filter material, and a plurality of water outlet holes are evenly provided on the water distribution pipe.

[0016] The above-mentioned precipitation-type air stripping filtration reaction equipment, wherein the sand filtration device comprises a water collection area and a sand filtration area arranged in sequence above and below, and the active filter material is filled and arranged in the sand filtration area;

[0017] A central sand filter riser is provided to connect the sand filter area and the water collection area. The central sand filter riser extends and is inserted into the active filter material. The lower end of the central sand filter riser is located at a position lower than the water distribution pipe. An air lifting device is provided at the bottom of the active filter material corresponding to the central sand filter riser.

[0018] A sand and water diversion pipe is arranged around the outer periphery of the central sand filter riser in the water collection area, a reflux channel is formed between the sand and water diversion pipe and the central sand filter riser, a second aeration device is arranged at the end of the reflux channel, and the position of the lower end pipe opening of the sand and water diversion pipe is higher than the top of the active filter material.

[0019] The above-mentioned sedimentation-type air stripping filtration reaction equipment, wherein a sand retaining hopper is provided at the upper end of the sand-water guide pipe corresponding to the central sand filter lifting pipe;

[0020] An overflow weir is provided at the upper portion of the water collection area.

[0021] The above-mentioned sedimentation-type air stripping filtration reaction equipment, wherein the aerobic reaction device includes a third aeration device and a water inlet pipe, the setting position of the water inlet pipe is lower than the setting position of the return pipe outlet, and the setting position of the water inlet pipe is higher than the setting position of the third aeration device.

[0022] The beneficial effects of the present invention are as follows:

[0023] (1) By reasonably distributing the aerobic reaction device, the sedimentation device and the sand filtration device in a limited space, multiple aeration, sedimentation, sand filtration and water discharge operations can be completed in the corresponding area, integrating the functions of aerobic microbial decomposition, sedimentation sand filtration and the like, thereby promoting the sewage treatment capacity, and the device occupies a small area and has a high volume utilization rate; wherein, the sedimentation device and the aerobic reaction device are connected by the air stripping mechanism, so that the supernatant after precipitation is repeatedly subjected to multiple aeration and sedimentation treatments; and the sedimentation device and the sand filtration device are connected by the liquid gathering and water distribution mechanism, so that the supernatant after precipitation flows to the sand filtration device for sand filtration, thereby greatly improving the orderliness, consistency and adequacy of sewage treatment;

[0024] (2) The aerobic reaction device is arranged upstream of the sedimentation device so that the aerated sewage flows to the sedimentation device through the overflow pipe by gravity. Under the condition of the same aeration volume, the third aeration device requires a lower wind pressure and lowers energy consumption, thereby solving the problem that the traditional aerobic device is arranged at the bottom, resulting in high aeration wind pressure and high energy consumption.

[0025] (3) A dosing pipe is newly connected to the overflow pipe to achieve a good dephosphorization effect while removing nitrogen;

[0026] (4) In order to achieve the purpose of degrading and removing pollutants from high-concentration organic wastewater, it is necessary to maintain a high activated sludge concentration. The air stripping mechanism is connected to the sedimentation device and the aerobic reaction device, and the second aeration device is provided in the return pipe to achieve a greatly increased concentration of aerobic microorganisms during the return flow. At the same time, the return sludge contains a large amount of microorganisms and organic matter, which effectively accelerates the reproduction rate of microorganisms and enhances the aerobic microbial treatment capacity. Secondly, the return does not require an additional sludge return pump, which reduces the floor space and energy consumption.

[0027] (5) The first aeration device is provided in the sedimentation hopper to effectively prevent the accumulation of fine suspended matter to form scum and block the sedimentation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below with reference to the accompanying drawings and examples.

[0029] Figure 1 It is a schematic cross-sectional view of the structure of the present invention;

[0030] Figure 2 is a schematic cross-sectional view of a precipitation device in the present invention;

[0031] Figure 3 is a schematic cross-sectional view of a sand filter device according to the present invention;

[0032] Figure 4 It is a schematic top view of the first aeration device in the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described below through specific examples to make the technical solution of the present invention easier to understand and grasp, rather than to limit the present invention.

[0034] Example: See Figures 1 to 4 , this embodiment provides a precipitation-type air stripping filtration reaction equipment, which includes:

[0035] The sand filter device 1 has an active filter material 11 filled at its bottom;

[0036] an aerobic reaction device 2, which is arranged at least on one side of the sand filter device 1;

[0037] The sedimentation device 3 is arranged downstream of the aerobic reaction device 2, and includes an air stripping mechanism and a liquid gathering and water distribution mechanism. The air stripping mechanism connects the sedimentation device 3 and the aerobic reaction device 2, and the liquid gathering and water distribution mechanism connects the sedimentation device 3 and the sand filtration device 1.

[0038] Specifically, by reasonably distributing the aerobic reaction device 2, the sedimentation device 3 and the sand filter device 1 in a limited space, multiple aeration, sedimentation, sand filtration and water discharge operations can be completed in the corresponding area, integrating the functions of aerobic microbial decomposition, sedimentation and sand filtration, etc., thereby promoting the sewage treatment capacity, and the device occupies a small area and has a high volume utilization rate; wherein, the sedimentation device 3 and the aerobic reaction device 2 are connected by the air stripping mechanism, so that the supernatant after precipitation is repeatedly subjected to multiple aeration and sedimentation treatments; and the sedimentation device 3 and the sand filter device 1 are connected by the liquid gathering and water distribution mechanism, so that the supernatant after precipitation flows to the sand filter device 1 for sand filtration, thereby greatly improving the orderliness, consistency and adequacy of sewage treatment.

[0039] Preferably, the sedimentation device 3 includes a sedimentation sludge hopper 331 and a sludge discharge pipe 332 arranged at the bottom, a first aeration device 34 is provided in the sedimentation sludge hopper 331, and the air lift mechanism is correspondingly arranged above the first aeration device 34; specifically, the sludge discharge pipe 332 controls sludge discharge through a control valve, and the sludge sediment is deposited in the sedimentation sludge hopper 331 and discharged through the sludge discharge pipe 332, ensuring timely discharge of old sludge and improving sewage treatment efficiency.

[0040] Preferably, the first aeration device 34 includes a first microporous aeration ring tube 341, a second microporous aeration ring tube 342, and at least four groups of microporous aeration inclined tubes 343, and the circumference of the first microporous aeration ring tube 341 is greater than the circumference of the second microporous aeration ring tube 342;

[0041] The first microporous aeration ring tube 341 is fitted on the upper inner wall surface of the sedimentation sludge hopper 331, and the second microporous aeration ring tube 342 is fitted on the lower inner wall surface of the sedimentation sludge hopper 331. The microporous aeration inclined tube 343 connects the first microporous aeration ring tube 341 and the second microporous aeration ring tube 342 and is fitted on the inner wall surface of the sedimentation sludge hopper 331, thereby greatly improving the aeration area and air lift effect of the sewage, and prompting bubbles to carry the sludge mixture upward into the air lift mechanism.

[0042] Preferably, the sedimentation device 3 further includes an overflow pipe 351 disposed at the bottom of the aerobic reaction device 2, the overflow pipe 351 connecting the aerobic reaction device 2 and the sedimentation device 3, a trumpet-shaped dispersion cover 352 is provided at the end of the overflow pipe 351, and a reflector 353 is correspondingly provided below the trumpet-shaped dispersion cover 352; the sewage treated by the aerobic reaction flows in through the overflow pipe 351, and the trumpet-shaped dispersion cover 352 and the reflector 353 are used in combination to evenly distribute the sewage mixed with the dephosphorization agent to the surrounding area; specifically, the sludge return ratio is controlled to be 50% to 300%, and the sludge sediment falls into the sedimentation sludge hopper 331 by gravity, and the sludge is discharged once every 3 to 5 days by hydrostatic pressure, and the supernatant is accumulated in the upper part of the sedimentation device 3, thereby improving the sludge adequacy and uniformity of the sedimentation.

[0043] Preferably, the precipitation device 3 further includes a dosing pipe 354, which is connected to the overflow pipe 351 through a pipe mixer. The dosing pipe 354 is externally connected to a dephosphorization agent supply mechanism to ensure good dephosphorization effect while removing nitrogen.

[0044] Preferably, the air stripping mechanism includes a return pipe 311, an air stripping pipe 312, and a trumpet-shaped air collecting hood 313, which are integrally formed in sequence. The trumpet-shaped air collecting hood 313 is correspondingly arranged above the first aeration device 34. The air stripping pipe 312 connects the sedimentation device 3 and the aerobic reaction device 2. The air stripping direction of the air stripping pipe 312 is opposite to the water outlet direction of the return pipe 311. The plane where the water outlet of the return pipe 311 is located is parallel to the internal liquid level of the aerobic reaction device 2. Specifically, multiple air stripping pipes 312 can be provided according to actual usage. The angle between the trumpet-shaped air collecting hood 313 and the horizontal direction is 55° to 85°, so as to promote the accumulation of bubbles into the air stripping pipe 312.

[0045] Preferably, the liquid collecting and water distributing mechanism includes a liquid collecting pipe 321 and several groups of water distributing pipes 322 which are connected to each other. The liquid collecting pipe 321 connects the sedimentation device 3 and the sand filter device 1 and is arranged on the upper part of the sedimentation device 3. The water distributing pipes 322 are arranged on the liquid collecting pipe 321 at intervals and inserted into the active filter material 11. Several water outlet holes are evenly arranged on the water distributing pipe 322.

[0046] Preferably, the sand filter device 1 comprises a water collection area and a sand filter area sequentially arranged up and down, and the active filter material 11 is filled and arranged in the sand filter area;

[0047] A central sand filter riser 12 is provided to connect the sand filter area and the water collection area. The central sand filter riser 12 extends and is inserted into the active filter material 11. The lower end of the central sand filter riser 12 is located at a position lower than the water distribution pipe 322. An air lifting device is provided at the bottom of the active filter material 11 corresponding to the central sand filter riser 12.

[0048] A sand and water diversion pipe 13 is provided around the outer periphery of the central sand filter riser 12 in the water collection area, and a return channel 14 is formed between the sand and water diversion pipe 13 and the central sand filter riser 12. A second aeration device 15 is provided at the end of the return channel 14, and the lower end of the sand and water diversion pipe 13 is provided at a position higher than the top of the active filter material 11. Specifically, sewage carrying a small amount of sand and fine suspended matter flows out from the upper end of the central sand filter riser 12 and enters the return channel 14, wherein the fine suspended matter is carried by the bubbles generated by the second aeration device 15, and overflows upward through the sand retaining hopper 16 into the aerobic reaction device 2, and the sand falls back into the active filter material 11 for reuse, so that the active filter material 11 maintains a high activated sludge concentration, while preventing sand from accumulating at the end of the return channel 14 and causing short-circuiting.

[0049] Preferably, a sand retaining hopper 16 is provided at the upper end of the sand and water diversion pipe 13 corresponding to the central sand filter riser 12; after the sewage flows out along the upper end of the central sand filter riser 12, the sand and water are returned to the reflux channel 14 through the sand retaining hopper 16 to avoid sand loss during the backwash process;

[0050] An overflow weir 17 is provided at the upper portion of the water collection area; the refluxed water is collected in the water collection area, and the supernatant flows out through the overflow weir 17 .

[0051] Preferably, the aerobic reaction device 2 includes a third aeration device 21 and a water inlet pipe 22. The setting position of the water inlet pipe 22 is lower than the setting position of the water outlet of the return pipe 311, and the setting position of the water inlet pipe 22 is higher than the setting position of the third aeration device 21. Specifically, the sewage to be treated flows into the aerobic reaction device 2 through the water inlet pipe 22, and after being decomposed by aerobic microorganisms in the third aeration device 21, it enters the sedimentation device 3 through the overflow pipe 351 under the action of gravity, thereby improving the sewage treatment capacity.

[0052] Specifically, the active filter material includes but is not limited to quartz sand, expanded clay or anthracite; preferably, the particle size of the active filter material is 0.1 to 8 mm. Due to the small particle size and large specific surface area of ​​the active filter material, the removal efficiency of fine suspended matter is higher, which can improve the sand filtration treatment capacity and efficiency of sewage.

[0053] The present invention, when working, comprises the following steps:

[0054] (1) The sewage to be treated flows into the aerobic reaction device 2 through the water inlet pipe 22 to realize the sewage inlet operation;

[0055] (2) Aeration through the third aeration device 21 provides oxygen to aerobic microorganisms, and the sewage continues to tumble under the action of the gas, and the aerobic microorganisms perform aerobic reaction treatment on the sewage to achieve sewage treatment;

[0056] (3) The sewage that has undergone primary sewage treatment flows into the sedimentation device 3 through the overflow pipe 351 under the action of gravity, and the phosphorus removal agent is introduced into the sewage through the dosing pipe 354. Under the action of the trumpet-shaped dispersion cover 352 and the reflective plate 353, the outflowing sewage is evenly distributed to achieve sewage disinfection treatment;

[0057] (4) The sewage is aerated through the first aeration device 34, and the sewage continuously tumbles under the action of the gas to form a gas upflow, driving the sewage to flow back to the aerobic reaction device 2 through the gas stripping mechanism, so as to achieve repeated aerobic reaction and precipitation of the sewage. The sludge sediment settles into the sedimentation sludge hopper 331 and is discharged from the sludge discharge pipe 332 to achieve sludge sedimentation;

[0058] (5) The supernatant after precipitation flows into the liquid collecting pipe 321 and evenly flows into the active filter material 11 through the water distribution pipe 322. The active filter material 11 performs sand filtration on the sewage to achieve the sewage sand filtration operation;

[0059] In addition, the air lifting device uses air lifting to make the sewage flow through the central sand filter lifting pipe 12 to the return channel 14. The second aeration device 15 aerates the sewage to accelerate the reproduction of microorganisms in the return sewage. The supernatant enters the water collection area and flows out from the overflow weir 17 to realize the water discharge operation.

[0060] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any person skilled in the art can, without departing from the scope of the present invention, utilize the above-disclosed technical means and technical content to make many possible variations and modifications to the present invention, or modify it into equivalent embodiments with equivalent variations. Therefore, any equivalent variations made in accordance with the shape, structure, and principle of the present invention that do not depart from the content of the present invention's technical solution should be included in the scope of protection of the present invention.

Claims

1. A precipitation-type air stripping filtration reaction equipment, characterized in that: It includes: A sand filter device, the bottom of which is filled with active filter material; an aerobic reaction device, disposed at least on one side of the sand filtration device; a sedimentation device, disposed at the lower portion of the aerobic reaction device, comprising an air stripping mechanism and a liquid collecting and water distributing mechanism, wherein the air stripping mechanism is connected to the sedimentation device and the aerobic reaction device, and the liquid collecting and water distributing mechanism is connected to the sedimentation device and the sand filtration device; Wherein, the liquid collecting and water distributing mechanism comprises a liquid collecting pipe and a plurality of water distributing pipes which are connected to each other; The sand filter device comprises a water collection area and a sand filter area arranged in sequence above and below, and the active filter material is filled and arranged in the sand filter area; A central sand filter riser is provided to connect the sand filter area and the water collection area. The central sand filter riser extends and is inserted into the active filter material. The lower end of the central sand filter riser is located at a position lower than the water distribution pipe. An air lifting device is provided at the bottom of the active filter material corresponding to the central sand filter riser. A sand and water diversion pipe is provided in the water collection area around the outer periphery of the central sand filter riser, a reflux channel is formed between the sand and water diversion pipe and the central sand filter riser, a second aeration device is provided at the end of the reflux channel, and the position of the lower end of the sand and water diversion pipe is higher than the top of the active filter material; A sand retaining hopper is provided at the upper end of the sand and water diversion pipe corresponding to the central sand filter lifting pipe; Sewage carrying a small amount of sand and fine suspended matter flows out from the upper end of the central sand filter lift pipe and enters the reflux channel, wherein the fine suspended matter is carried by the bubbles generated by the second aeration device and overflows upward through the sand retaining hopper into the aerobic reaction device; The gas stripping mechanism includes a reflux pipe, a gas stripping pipe and a trumpet-shaped gas collecting hood which are integrally formed and connected in sequence; The aerobic reaction device includes a third aeration device and a water inlet pipe, wherein the water inlet pipe is located lower than the water outlet of the return pipe and is located higher than the third aeration device; The precipitation device further comprises a flow pipe provided at the bottom of the aerobic reaction device, wherein the flow pipe is connected to the aerobic reaction device and the precipitation device; The air stripping mechanism is used to connect the precipitation device and the aerobic reaction device, so that the supernatant liquid after precipitation can be repeatedly subjected to multiple aeration and precipitation treatments.

2. The precipitation-type air stripping filtration reaction equipment according to claim 1, characterized in that: The sedimentation device includes a sedimentation hopper and a mud discharge pipe arranged at the bottom. A first aeration device is arranged in the sedimentation hopper, and the air stripping mechanism is correspondingly arranged above the first aeration device.

3. The precipitation-type air stripping filtration reaction equipment according to claim 2, characterized in that: The first aeration device includes a first microporous aeration ring tube, a second microporous aeration ring tube and at least four groups of microporous aeration inclined tubes, and the circumference of the first microporous aeration ring tube is greater than the circumference of the second microporous aeration ring tube; The first microporous aeration ring tube is fitted on the upper inner wall surface of the sedimentation mud hopper, the second microporous aeration ring tube is fitted on the lower inner wall surface of the sedimentation mud hopper, and the microporous aeration inclined tube connects the first microporous aeration ring tube and the second microporous aeration ring tube and is fitted on the inner wall surface of the sedimentation mud hopper.

4. The precipitation-type air stripping filtration reaction equipment according to claim 3, characterized in that: A trumpet-shaped dispersion cover is provided at the end of the flow pipe, and a reflective plate is correspondingly provided below the trumpet-shaped dispersion cover.

5. The precipitation-type air stripping filtration reaction equipment according to claim 4, characterized in that: The precipitation device further comprises a dosing pipeline, the dosing pipeline is communicated with the overflow pipeline via a pipeline mixer, and the dosing pipeline is externally connected to a dephosphorization agent supply mechanism.

6. The precipitation-type air stripping filtration reaction equipment according to claim 5, characterized in that: The trumpet-shaped air collecting hood is correspondingly arranged above the first aeration device, the air stripping pipe connects the sedimentation device and the aerobic reaction device, the air stripping direction of the air stripping pipe is opposite to the water outlet direction of the return pipe, and the plane where the water outlet of the return pipe is located is parallel to the internal liquid level of the aerobic reaction device.

7. The precipitation-type air stripping filtration reaction equipment according to claim 6, characterized in that: The liquid collecting pipe is connected with the sedimentation device and the sand filter device and is arranged on the upper part of the sedimentation device. The water distribution pipe is arranged on the liquid collecting pipe at intervals and inserted into the active filter material. A plurality of water outlet holes are evenly arranged on the water distribution pipe.

8. The precipitation-type air stripping filtration reaction equipment according to claim 7, characterized in that: An overflow weir is provided at the upper portion of the water collection area.

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