Cage-type electrocoagulation cyclone reaction sediment inspection well and its sewage treatment method

Abstract

The present invention discloses a cage-type electrocoagulation cyclone reaction sediment inspection well and a sewage treatment method thereof. The inspection well includes a well body and an electrocoagulation assembly disposed therein. The water outlet side of the inlet pipe is communicated with an inlet elbow facing the inner wall of the well body to generate sewage swirling power. The water inlet side of the outlet pipe is communicated with an outlet slag baffle pipe. A sedimentation area is provided at the bottom of the well body. The electrocoagulation assembly is movably installed on the inner wall of the well body and includes a cage-type cathode and a rod-shaped anode. By means of coupling electrocoagulation, the sewage inspection well of the present invention can effectively remove suspended solids, organic matter and total phosphorus in sewage, improving the treatment effect of the sewage collection system on pollutants. At the same time, the use of cage-type electrodes greatly reduces the volume of the electrocoagulation assembly, enabling it to operate in the narrow space of the inspection well. Based on the structure of the cyclone-type inspection well, the mixing effect of the sewage in the well is increased, helping to quickly sediment the sludge so that the flocs formed by electrocoagulation can settle in situ in the well, avoiding the siltation and blockage of the downstream pipeline.

Description

Technical Field

[0001] The present invention relates to the field of environmental engineering, and particularly to a cage-type electrocoagulation swirl reaction sedimentation inspection well and a sewage treatment method thereof. Background Art

[0002] An inspection well is an important part of a gravity flow drainage system. Its function is to provide an entrance to the drainage system, facilitate maintenance and repair, and at the same time facilitate the connection of upstream and downstream pipelines. Generally speaking, an inspection well is part of the sewage collection system, helping the sewage pipe network to perform the sewage collection function, and having limited effect on sewage treatment. To reduce the risk of siltation and blockage in sewage pipes, some inspection wells are modified into sedimentation wells by increasing the distance between the pipe bottom and the well bottom to create a sedimentation space at the well bottom, and play a certain role in removing sediments through physical sedimentation, so that it has a preliminary pollutant removal effect.

[0003] In order to further improve the pollutant removal function of the inspection well and reduce the risk of siltation and blockage in downstream pipelines, the prior art also adopts methods such as adding baffles and fillers to improve the suspended solid interception ability and reduce the suspended solid concentration in the effluent of the inspection well. However, such a scheme has basically no removal effect on pollutants such as dissolved organic matter and total phosphorus, and the effluent still needs to be subjected to conventional biochemical treatment, and the pollutant removal function of the sewage collection system cannot be effectively exerted; at the same time, the addition of baffles and fillers greatly deteriorates the hydraulic conditions of the inspection well and is extremely prone to blockage.

[0004] Electrocoagulation is a technology that generates flocculating substances through electrochemical reactions and then plays a flocculation and sedimentation role. In the field of sewage treatment, common metals such as iron plates and aluminum plates are often used as anodes. After the anode is energized, Fe ions or Al ions are quickly formed, and flocculation can occur to remove pollutants such as organic matter, suspended solids, and total phosphorus in sewage, with the characteristics of fast pollutant removal speed and good effluent quality. The electrocoagulation technology is generally applied to the electrocoagulation reactor in a sewage treatment plant, and the arrangement of parallel electrode plates is relatively common.

[0005] That is, in order to improve the pollutant removal efficiency of electrocoagulation, the prior art adopts a multi-stage parallel electrode plate method to increase the generation rate of electrocoagulation substances, and adopts a method of exchanging positive and negative electrodes to reduce electrode passivation. However, in such a scheme, the arrangement of multi-stage parallel electrode plates requires a large amount of reactor space, and it is difficult to miniaturize the equipment for use in the sewage collection system; at the same time, the multi-stage parallel electrode plates will affect the flow pattern of sewage, resulting in insufficient mixing of the water body during the flocculation process and affecting the flocculation effect. Summary of the Invention

[0006] In order to overcome the above problems, the present application provides a cage-type electrocoagulation swirl reaction sedimentation inspection well and a sewage treatment method thereof.

[0007] The object of the invention of this application or the technical problem to be solved is as follows:

[0008] ① By means of coupled electrocoagulation, the sewage inspection well can effectively remove suspended solids, organic matter and total phosphorus in sewage, greatly improve the treatment effect of the sewage collection system on pollutants, and reduce the load of the terminal treatment facilities;

[0009] ② The use of cage electrodes greatly reduces the volume of the electrocoagulation component, enabling it to operate in the narrow space of the inspection well. At the same time, the cage structure is used to reduce the electrode passivation rate and the probability of short circuit, and improve the electrocoagulation efficiency;

[0010] ③ Design a swirl-type inspection well structure to increase the mixing effect of the sewage in the well, and at the same time help to quickly sediment the sludge, so that the flocs formed by electrocoagulation can settle in situ in the well, avoiding siltation and blockage of the downstream pipeline.

[0011] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0012] A cage-type electrocoagulation swirl reaction sedimentation inspection well, comprising a well body and an electrocoagulation component arranged therein;

[0013] The well body includes a water inlet pipe and a water outlet pipe arranged at the upper end;

[0014] The water outlet side of the water inlet pipe is communicated with a water inlet elbow facing the inner wall of the well body to generate sewage swirl power, and the water inlet side of the water outlet pipe is communicated with a water outlet slag blocking pipe;

[0015] The bottom of the well body is provided with a sedimentation area, and the lower end inlet of the water outlet slag blocking pipe is located above the sedimentation area;

[0016] The electrocoagulation component is movably installed on the inner wall of the well body, and includes a cage-type cathode and a rod-shaped anode. The rod-shaped anode is fixed in the cage-type cathode through an electrode support. The cage-type cathode is a mesh cylinder, and the upper and lower ends are openable. There is a gap between the cage-type cathode and the rod-shaped anode, and the rod-shaped anode is bonded and fixed to the electrode support.

[0017] As an improvement of the above technical solution, two electrocoagulation components are installed in the well body through hooks, and they are oppositely arranged on both sides of the inner wall of the well body.

[0018] As an improvement of the above technical solution, the electrocoagulation component is directly powered by a building photovoltaic system, with a voltage of 5-10V.

[0019] As an improvement of the above technical solution, the top of the well body is provided with a manhole cover and a well ring. The manhole cover is provided with a ventilation hole, and the well ring is provided with a power cord connection hole.

[0020] As an improvement of the above technical solution, the cage-type cathode is a mesh cylinder rolled from a metal mesh material.

[0021] As an improvement of the above technical solution, the rod-shaped anode is an iron rod.

[0022] As an improvement of the above technical solution, the mesh aperture of the cage-shaped cathode is 3-5 mm.

[0023] As an improvement of the above technical solution, the electrode support is a plastic ring, which is physically bonded and fixed to the rod-shaped anode through an insulating binder.

[0024] As an improvement of the above technical solution, the gap between the rod-shaped anode and the periphery of the cage-shaped cathode is 1-2 cm.

[0025] As an improvement of the above technical solution, the water flow velocity at the outlet of the water inlet elbow is 0.2-1.0 m / s to generate the sewage swirling power.

[0026] The purpose of the present invention also lies in providing a sewage treatment method based on the above-mentioned cage-type electrocoagulation swirling reaction sediment inspection well, which includes:

[0027] Sewage flows into the inspection well through the water inlet pipe, and under the guiding action of the water inlet elbow and the water outlet slag blocking pipe, a swirling power is generated along the inner wall of the well body;

[0028] When the sewage flows through the electrocoagulation component, the rod-shaped anode electrolyzes to generate Fe ions, which are fully mixed, contacted and reacted with the sewage under the action of sewage swirling. Suspended substances, organic matters and total phosphorus pollutants in the sewage form flocs with Fe ions and their hydrolysis products. The flocs quickly impact the well body due to the swirling action in the well, and then fall into the sedimentation area and are compressed and settled to the bottom of the well to complete the removal of pollutants;

[0029] The cage-shaped cathode electrolyzes to generate fine hydrogen bubbles that rise along the electrocoagulation component, scour the surface of the rod-shaped anode, and at the same time make the whole electrocoagulation component in an anoxic state. The sewage realizes the removal of pollutants through electrocoagulation and swirling reaction precipitation, and flows out of the inspection well through the water outlet slag blocking pipe and the water outlet pipe.

[0030] The beneficial effects brought by the present invention:

[0031] On the basis of effectively solving the aforementioned technical problems to be solved, the present invention also has the following improvements:

[0032] ① Large floating objects in the sewage may cause short circuits between the anode and cathode of the conventional electrocoagulation system. In this application, a cage-shaped cathode is used for physical blocking, thus eliminating the possibility of electrode short circuits; the electrocoagulation anode is prone to passivation after long-term use, resulting in a decrease in electrocoagulation efficiency. The cage-shaped cathode surrounds the rod-shaped anode, so that the hydrogen generated by the cathode wraps around the anode surface and rises along the anode, creating an anoxic environment near the anode and delaying the passivation speed of the anode. At the same time, the rising bubbles form a physical scouring force, further slowing down the passivation speed of the anode;

[0033] ②The sewage may have problems of short - circuit flow and insufficient residence time in the existing inspection well. In this application, an inlet elbow and an outlet slag - blocking pipe are used in cooperation. The kinetic energy of the inflowing sewage is utilized to form an effective swirl flow in the well. At the same time, the lower - end inlet of the outlet slag - blocking pipe extends deep into the well, and the inlet is arranged above the sedimentation area, so that the sewage can flow out only after multiple swirls, avoiding short - circuit flow in the well. During the electro - flocculation process, scum is easily generated, and the scum may cause pipeline blockage after entering the downstream pipeline. By using the outlet slag - blocking pipe to block the scum from entering the outlet pipe, the scum can be effectively blocked from being discharged into the downstream pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below in conjunction with the drawings and specific embodiments:

[0035] Figure 1 is a structural schematic diagram of the cage - type electro - flocculation swirl reaction sedimentation inspection well Figure 1 ;

[0036] Figure 2 is a structural schematic diagram of the cage - type electro - flocculation swirl reaction sedimentation inspection well Figure 2 ;

[0037] Figure 3 is a structural schematic diagram of the electro - flocculation component of this application.

[0038] Reference numerals in the figures:

[0039] 1 - manhole cover; 2 - well ring; 3 - inlet pipe; 4 - inlet elbow; 5 - outlet pipe; 6 - outlet slag - blocking pipe; 7 - well body; 8 - sedimentation area; 9 - electro - flocculation component; 10 - cage - type cathode; 11 - rod - shaped anode; 12 - electrode support. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] Embodiment 1

[0042] Referring to Figures 1-3 , the cage - type electro - flocculation swirl reaction sedimentation inspection well includes a well body 7 and an electro - flocculation component 9 arranged therein. A manhole cover 1 and a well ring 2 are arranged at the top of the well body 7. A ventilation hole is opened on the manhole cover 1, and a power cord connection hole is opened on the well ring 2.

[0043] The well body 7 includes a water inlet pipe 3 and a water outlet pipe 5 arranged at the upper end. The water outlet side of the water inlet pipe 3 is communicated with a water inlet pipe head facing the inner wall of the well body 7 to generate sewage swirling power. The water inlet side of the water outlet pipe 5 is communicated with a water outlet slag blocking pipe 6 to prevent the electrocoagulation scum in the well from entering the water outlet pipe 5. A sedimentation area 8 is provided at the bottom of the well body 7, and the lower end inlet of the water outlet slag blocking pipe 6 is located above the sedimentation area 8, which can help the sewage swirl in the well and prevent the sewage from short-circuiting in the well.

[0044] The electrocoagulation assembly 9 is movably installed on the inner wall of the well body 7 and is an electrochemical assembly with a cage electrode as the core. It includes a cage cathode 10 and a rod-shaped anode 11. The rod-shaped anode 11 is fixed in the cage cathode 10 through an electrode support 12. The cage cathode 10 is a mesh cylinder and can be opened at the upper and lower ends. Specifically, it is a mesh cylinder rolled from a metal mesh material. The cylinder rolled from the metal mesh material can protect the rod-shaped anode 11 inside the cylinder by physical blocking while serving as the cathode. At the same time, the hydrogen formed by the electrolysis of the cathode can cover the surface of the rod-shaped anode 11, slowing down the electrode passivation speed.

[0045] A gap of 1-2 cm is left between the cage cathode 10 and the rod-shaped anode 11 to avoid electrode short-circuit. The rod-shaped anode 11 is physically bonded and fixed to the electrode support 12. Further, the electrode support 12 is a plastic ring, which is physically bonded and fixed to the rod-shaped anode 11 through an insulating adhesive. This design can prevent the rod-shaped anode 11 from falling off the support when its diameter decreases after consumption.

[0046] In a preferred embodiment, two electrocoagulation assemblies 9 are installed in the well body 7 through hooks. They are oppositely arranged on both sides of the inner wall of the well body 7. When maintenance is needed, they can be taken out of the inspection well for maintenance. This can improve the electrocoagulation effect and avoid the influence of a single component failure on the electrocoagulation effect. The electrocoagulation assembly 9 is powered by a building photovoltaic system with a DC voltage controlled at 5-10V.

[0047] In a preferred embodiment, the rod-shaped anode 11 is an iron rod, and Fe ions are precipitated as the anode for flocculation.

[0048] In a preferred embodiment, the mesh aperture of the cage cathode 10 is 3-5 mm. The mesh structure can effectively block large particulate matters in the sewage from directly contacting the anode, avoiding electrode short-circuit. At the same time, the sewage can pass through the mesh smoothly, avoiding affecting the sewage flow pattern.

[0049] In a preferred embodiment, the water outlet flow rate of the water inlet elbow 4 is 0.2-1.0 m / s to generate sewage swirling power.

[0050] Embodiment 2

[0051] A sewage treatment method applied to the cage electrocoagulation swirl reaction sedimentation inspection well described in Embodiment 1 includes the following processes:

[0052] Sewage flows into the inspection well through the inlet pipe 3, and under the guiding action of the inlet elbow 4 and the outlet slag blocking pipe 6, a swirling power is generated along the inner wall of the well body 7;

[0053] When the sewage flows through the electrocoagulation assembly 9, the rod-shaped anode 11 electrolyzes to generate Fe ions, which are fully mixed, contacted and reacted with the sewage under the action of the sewage swirl. Suspended substances, organic matters and total phosphorus pollutants in the sewage form flocs with Fe ions and their hydrolysis products. The flocs quickly impact the well body 7 due to the swirling action in the well, and then fall into the sedimentation area 8 and are compressed and settled to the bottom of the well therein, completing the removal of pollutants;

[0054] The cage-shaped cathode 10 electrolyzes to generate fine hydrogen bubbles that rise along the electrocoagulation assembly 9, scouring the surface of the rod-shaped anode 11, and at the same time making the whole electrocoagulation assembly 9 in an anoxic state. The sewage realizes the removal of pollutants through electrocoagulation and swirling reaction precipitation, and flows out of the inspection well through the outlet slag blocking pipe 6 and the outlet pipe 5.

[0055] It should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Cage - type electro - flocculation cyclone reaction sediment inspection well, characterized in that: It includes a well body and an electrocoagulation component arranged therein; The well body includes a water inlet pipe and a water outlet pipe arranged at the upper end; there are two electrocoagulation components, which are oppositely arranged on both sides of the inner wall of the well body; The water outlet side of the water inlet pipe is communicated with a water inlet elbow facing the inner wall of the well body, and the water flow velocity of the water outlet of the water inlet elbow is 0.2 - 1.0 m / s to generate sewage swirling power, and the water inlet side of the water outlet pipe is communicated with a water outlet slag blocking pipe; A sedimentation area is arranged at the bottom of the well body, and the lower end inlet of the water outlet slag blocking pipe is located above the sedimentation area; The electrocoagulation component is movably installed on the inner wall of the well body, and it includes a cage - type cathode and a rod - shaped anode. The gap between the rod - shaped anode and the periphery of the cage - type cathode is 1 - 2 cm. The cage - type cathode is a net - shaped cylinder rolled from a metal mesh material, and the mesh aperture of the cage - type cathode is 3 - 5 mm. The rod - shaped anode is fixed in the cage - type cathode through an electrode support. The cage - type cathode is in the shape of a net - shaped cylinder and can be opened at the upper and lower ends. There is a gap between the cage - type cathode and the rod - shaped anode, and the rod - shaped anode is fixedly bonded with the electrode support; The cage - type cathode surrounds the rod - shaped anode, so that the hydrogen gas generated by the cathode wraps around the anode surface and rises along the anode, creating an anoxic environment near the anode, delaying the speed of anode passivation. At the same time, the rising bubbles form a physical scouring force, further slowing down the speed of anode passivation.

2. The cage - type electrocoagulation swirling reaction sedimentation inspection well according to claim 1, wherein: Two electrocoagulation components are installed in the well body through hooks.

3. The cage - type electrocoagulation swirling reaction sedimentation inspection well according to claim 1, wherein: The electrocoagulation component is directly current - powered by a building photovoltaic system, with a voltage of 5 - 10V.

4. The cage - type electrocoagulation swirling reaction sedimentation inspection well according to claim 1, wherein: A manhole cover and a manhole ring are arranged at the top of the well body. A ventilation hole is opened on the manhole cover, and a power cord connection hole is opened on the manhole ring.

5. The cage - type electrocoagulation swirling reaction sedimentation inspection well according to claim 1, wherein: The rod - shaped anode is an iron rod.

6. The cage - type electrocoagulation swirling reaction sedimentation inspection well according to claim 1, wherein: The electrode support is a plastic ring, and it is physically bonded and fixed with the rod - shaped anode through an insulating binder.

7. A sewage treatment method for a cage-type electrocoagulation cyclone reaction sediment inspection well, characterized in that: This method is applied to the cage - type electrocoagulation swirling reaction sedimentation inspection well according to any one of claims 1 - 6, and includes: Sewage flows into the inspection well through the water inlet pipe, and under the guiding action of the water inlet elbow and the water outlet slag blocking pipe, swirling power is generated along the inner wall of the well body; When the sewage flows through the electrocoagulation component, the rod - shaped anode electrolyzes to generate Fe ions, which are fully mixed, contacted, and reacted with the sewage under the action of the sewage swirl. Suspended substances, organic matters, and total phosphorus pollutants in the sewage form flocs with Fe ions and their hydrolysis products. The flocs quickly impact the well body due to the swirl in the well, then fall into the sedimentation area and are compressed and settled to the bottom of the well, completing the removal of pollutants; The cage-type cathode electrolyzes to generate fine hydrogen bubbles that rise along the electrocoagulation component, scouring the surface of the rod-shaped anode. At the same time, it makes the overall electrocoagulation component in an anoxic state. The sewage realizes the removal of pollutants through electrocoagulation and vortex reaction precipitation, and flows out of the inspection well through the effluent slag baffle pipe and the outlet pipe.

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