Sewage treatment system

Abstract

The utility model relates to the technical field of sewage treatment, and discloses a sewage treatment system which comprises an electrochemical treatment system, a cavitation generator, an MBR (Membrane Bioreactor) treatment system, an electrooxidation catalysis treatment system, an oxidation catalysis system and an electrochemical oxidation treatment system which are sequentially connected through pipelines. According to the sewage treatment device, the sewage is subjected to electrochemical treatment and cavitation treatment in advance, macromolecules in the sewage are effectively treated, and organic substances and ammonia nitrogen molecular chains in the sewage are decomposed, so that the subsequent treatment is easier, the treatment effect is good, and the energy consumption is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, concretely relates to a sewage treatment system. BACKGROUND

[0002] At present, the garbage disposal mode of domestic large and medium-sized cities has landfill, composting and incineration and the like. The essence of sewage treatment is to degrade organic carbon and nitrogen pollutants in sewage through physical, chemical and / or biological and other multiple sub-processes, so that the effluent index of the treated sewage meets the sewage discharge standard. During the treatment process, various metabolites and water are produced due to anaerobic fermentation, organic matter decomposition, rainwater flushing, groundwater soaking and the like, forming landfill leachate. The landfill leachate contains a large amount of substances, such as heavy metal particles, ammonia nitrogen and COD (chemical oxygen demand), which are very high, which makes the treatment of landfill leachate very difficult. The commonly used treatment method at present is to transport to the municipal sewage treatment plant for treatment, which needs to bear high transportation cost and treatment cost, and causes pollution source transfer during the transportation process, which is easy to cause secondary pollution and the like.

[0003] With the progress of biotechnology and membrane treatment technology, the combined process of biochemical method + membrane method for treating leachate technology has developed rapidly and gradually becomes the mainstream technology for treating leachate. Most of the refractory organic pollutants in the biochemical effluent can be intercepted by the nanofiltration unit, and the nanofiltration effluent is treated by reverse osmosis, which can almost ensure that all pollution indexes meet the discharge standard. However, due to the working characteristics of the nanofiltration membrane / reverse osmosis membrane, the membrane method process only realizes the interception of pollutants, and a large amount of membrane concentrate is inevitably produced during the membrane treatment process, and this part of the concentrate has higher high-concentration refractory organic matter. For this part of the concentrate, the existing membrane concentrate treatment technology mostly has problems of high treatment cost, excessively high energy consumption, unstable treatment effect and the like. UTILITY MODEL CONTENT

[0004] The utility model aims at the above problems, and provides a sewage treatment system, which has good treatment effect, low energy consumption and reaches the discharge standard in water quality.

[0005] In order to achieve the above object, the utility model adopts the technical scheme as follows: a sewage treatment system, including through pipeline connection's electrochemistry processing system, cavitation generator, MBR treatment system, electric oxidation catalytic treatment system, oxidation catalytic system and electrochemistry oxidation treatment system, sewage first enters electrochemistry processing system and carries out electrochemistry pretreatment, then pressurized and is sent into cavitation generator, the organic matter and ammonia nitrogen molecular chain in the sewage are decomposed in the cavitation generator, the MBR treatment system is used for filtering separation to the sewage after cavitation treatment, the sewage that the MBR treatment system discharges is input to the electric oxidation catalytic treatment system and is oxidized catalytic, and is sent to the oxidation catalytic system, the oxidation catalytic system is connected with ozone tank, is used to add ozone to the oxidation catalytic system and increase the reaction, and the sewage that is discharged from the oxidation catalytic system is oxidized after the last treatment in the electrochemistry oxidation treatment system and reaches the discharge standard.

[0006] Preferably, the cavitation generator also adds active agent.

[0007] Preferably, the sludge outlet of the MBR treatment system and the electrochemistry oxidation treatment system is connected with a sludge fermentation tank, and the outlet of the sludge fermentation tank is connected with the cavitation generator and the compression filter.

[0008] Preferably, the cavitation generator comprises a shell, a rotor arranged in the shell, and a driving motor for driving the rotor to rotate, and the shell is provided with a liquid inlet and a liquid outlet.

[0009] Preferably, the rotor comprises a rotating shaft and a rotating drum arranged outside the rotating shaft, the rotating shaft is rotatably connected with the shell through a bearing, one end of the rotating shaft is connected with the driving motor, a plurality of first rotating blades are arranged on the rotating shaft, the lower end of the rotating drum is connected with the rotating shaft, a plurality of through holes are arranged on the rotating drum, and a plurality of second rotating blades are arranged on the outer wall of the rotating drum.

[0010] Preferably, the electrochemistry processing system is connected with the compression filter through a slag discharge pipe.

[0011] Due to the above technical scheme, the utility model has the following beneficial effects:

[0012] The utility model adopts the process of "electrochemistry treatment + cavitation treatment + MBR treatment + electric oxidation catalysis + oxidation catalysis + electrochemistry oxidation", the macromolecule in sewage can be settled and pollutant separated by electrochemistry treatment, then the sewage is subjected to cavitation treatment, which can effectively decompose the organic matter and ammonia nitrogen molecular chain in the sewage, so that the subsequent treatment is easier, the sewage treatment effect is good, the treated sewage is effectively filtered, the pretreatment of the sewage is realized, the difficulty of subsequent treatment is reduced, the treatment effect is good, the energy consumption is low, and the water quality reaches the discharge standard. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 Structure diagram of one embodiment of the present application;

[0014] Figure 2 Structure diagram of cavitation generator of the present application;

[0015] Figure 3 Structure diagram of the present application Figure 2 Structure diagram of A-A plane of the present application;

[0016] In the figure: 1-electrochemical treatment system, 2-cavitation generator, 3-MBR treatment system, 4-electro-oxidation catalytic treatment system, 5-oxidation catalytic system, 6-electrochemical oxidation treatment system, 7-sludge fermentation tank, 8-compression filter, 9-active agent, 10-ozone tank, 21-housing, 22-rotor, 221-rotating shaft, 222-first rotating blade, 223-rotating drum, 224-second rotating blade, 225-through hole, 23-driving motor, 24-liquid inlet, 25-liquid outlet. DETAILED DESCRIPTION

[0017] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Unless otherwise defined, all the technical and scientific terms used in the present application have the same meanings as those commonly understood by the person skilled in the art belonging to the technical field of the present application. The terms used in the present application in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The terms "first", "second", and the like in the specification of the present application and the claims and the above drawings are used to distinguish different objects and are not used to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed or can optionally include other steps or units inherent to the process, method, product or device.

[0018] In the present application, the term "embodiment" means that the specific features, structures or characteristics described in combination with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment independent of or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0019] As Figure 1As shown, a wastewater treatment system includes an electrochemical treatment system 1, a cavitation generator 2, an MBR treatment system 3, an electro-oxidation catalytic treatment system 4, an oxidation catalytic system 5, and an electrochemical oxidation treatment system 6, connected sequentially by pipelines. Wastewater first enters the electrochemical treatment system 1 for electrochemical pretreatment, and then is pressurized and sent to the cavitation generator 2. In the cavitation generator 2, organic matter and ammonia nitrogen molecular chains in the wastewater are decomposed. The MBR treatment system 3 is used to filter and separate the cavitation-treated wastewater. The wastewater discharged from the MBR treatment system 3 is input into the electro-oxidation catalytic treatment system 4 for oxidation catalysis, and then sent to the oxidation catalytic system 5. The oxidation catalytic system 5 is connected to an ozone tank 10, which is used to add ozone to the oxidation catalytic system 5 to increase the reaction. The wastewater discharged from the oxidation catalytic system 5 undergoes final oxidation treatment in the electrochemical oxidation treatment system 6 before being discharged in compliance with standards.

[0020] Preferably, an active agent 9 is also added to the cavitation generator 2. The active agent 9 can enhance the activity of microorganisms in the biological treatment tank, increase the population of microorganisms, and improve their adaptability and decomposition capacity to wastewater.

[0021] The sludge outlets of the MBR treatment system 3 and the electrochemical oxidation treatment system 6 are connected to the sludge fermentation tank 7. The outlet of the sludge fermentation tank 7 is connected to the cavitation generator 2 and the compression filter 8, respectively. The activated sludge produced after the wastewater is filtered and separated in the MBR treatment system 3 and the sludge produced after the electrochemical oxidation treatment system 6 are discharged into the sludge fermentation tank 7 for fermentation. Part of the fermented sludge is sent to the cavitation generator 2 for recycling, and the other part is recycled by the compression filter 8.

[0022] like Figure 2 As shown, the cavitation generator 2 includes a housing 21, a rotor 22 disposed within the housing 21, and a drive motor for driving the rotor 22 to rotate. The housing 21 is provided with a liquid inlet 24 and a liquid outlet 25. The rotor 22 is composed of rotating blades mounted on the shaft 221 of the drive motor, or other similar rotor structures, as long as high-speed rotation is achieved.

[0023] like Figure 3 As shown, in order to achieve a better counter-flush effect, the rotor 22 includes a rotating shaft 221 and a rotating cylinder 223 located outside the rotating shaft 221. The rotating shaft 221 is rotatably connected to the housing 21 through a bearing. One end of the rotating shaft 221 is connected to a drive motor. The rotating shaft 221 is provided with a plurality of first rotating blades 222. The lower end of the rotating cylinder 223 is connected to the rotating shaft 221. The rotating cylinder 223 is provided with a plurality of through holes 225. The outer wall of the rotating cylinder 223 is provided with a plurality of second rotating blades 224.

[0024] In the cavitation generator 2, the sewage from the inlet 25 forms a pressure jet and is sprayed in the rotating drum 223. The first rotating blade 222 rotates at high speed and collides with the jet, the jet is stirred and forms a counterflow, bubbles are generated, the bubbles collide with the inner wall of the rotating drum 223 and collapse, and the liquid quickly flows out of the through hole 225 to form a cavitation cloud, which collides with the shell 21 and collapses. The second rotating blade 224 is driven by the rotating drum 223 to rotate at high speed, further strengthening the counterflow effect, accumulating and strengthening the cavitation effect, greatly improving the cavitation intensity and cavitation effect. The collapse of the cavitation releases a lot of energy to the surrounding liquid, which is used to produce mechanical effect, thermal effect and chemical effect to achieve sewage degradation treatment. At the same time, under the action of the active agent 9, the organic matter in the sewage can be quickly decomposed, so that the sewage can be better treated. Then in the MBR treatment system 3, the electro-oxidation catalytic treatment system 4, the oxidation catalytic system 5 and the electrochemical oxidation treatment system, the sewage can be more easily and thoroughly treated, so that the water quality after treatment meets the standard requirements.

[0025] The electrochemical treatment system 1 is connected with the compression filter 8 through the slag discharge pipe. The sewage treated in the electrochemical treatment system 1 produces sediment, which is discharged into the compression filter 8 for recycling. The electrochemical treatment system 1 can use any one of the electrochemical oxidation reduction, electrocoagulation, electroflotation, photoelectrochemical oxidation or internal electrolysis method.

[0026] The above-mentioned electrochemical treatment system 1, MBR treatment system 3, electro-oxidation catalytic treatment system 4, oxidation catalytic system 5 and electrochemical oxidation treatment system 6 are all existing treatment systems, which can be used by those skilled in the art, and the parameters involved are not particularly limited.

[0027] The utility model discloses an electrochemical treatment system, which comprises an electrochemical treatment system 1, a cavitation generator 2, a MBR treatment system 3, an oxidation catalytic system 5 and an electrochemical oxidation treatment system.

[0028] The utility model saves resources and reduces the final sludge output.

[0029] The above has made the detailed description to the utility model, but can make some modification or improvement to it on the basis of the utility model, and this is obvious to the general technical personnel in the technical field. Therefore, the modification or improvement without departing from the utility model's thought spirit is within the utility model's protection scope.

Claims

1. A sewage treatment system characterised in that: The sewage is first sent into the electrochemical treatment system for electrochemical pretreatment, then is sent into the cavitation generator under pressure, and the organic matter and ammonia nitrogen molecular chains in the sewage are decomposed in the cavitation generator, the MBR treatment system is used for filtering and separating the sewage after the cavitation treatment, the sewage discharged from the MBR treatment system is input into the electro-oxidation catalytic treatment system for oxidation catalysis, then is sent into the oxidation catalytic system, the oxidation catalytic system is connected with an ozone tank for adding ozone into the oxidation catalytic system to increase the reaction, and the sewage discharged from the oxidation catalytic system is subjected to the last oxidation treatment in the electrochemical oxidation treatment system and is discharged after reaching the standard.

2. A sewage treatment system as claimed in claim 1, characterised in that: The cavitation generator is additionally provided with an active agent.

3. The sewage treatment system of claim 1, wherein: The sludge outlets of the MBR treatment system and the electrochemical oxidation treatment system are connected with a sludge fermentation tank, and the outlet of the sludge fermentation tank is connected with the cavitation generator and the compression filter.

4. The sewage treatment system of claim 1, wherein: The cavitation generator comprises a shell, a rotor arranged in the shell and a driving motor for driving the rotor to rotate, and the shell is provided with a liquid inlet and a liquid outlet.

5. A sewage treatment system as claimed in claim 4, wherein: The rotor comprises a rotating shaft and a rotating drum arranged outside the rotating shaft, the rotating shaft is rotatably connected with the shell through a bearing, one end of the rotating shaft is connected with the driving motor, a plurality of first rotating blades are arranged on the rotating shaft, the lower end of the rotating drum is connected with the rotating shaft, a plurality of through holes are arranged on the rotating drum, and a plurality of second rotating blades are arranged on the outer wall of the rotating drum.

6. A sewage treatment system as claimed in claim 3, wherein: The electrochemical treatment system is connected with the compression filter through a slag discharge pipe.

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