CN111875170A - High-quality and high-efficiency sewage treatment system and sewage treatment process - Google Patents

Abstract

The invention relates to a high-quality high-efficiency sewage treatment system which comprises pretreatment equipment, an anoxic tank, an aerobic tank and an MBR (membrane bioreactor), wherein the pretreatment equipment, the anoxic tank, the aerobic tank and the MBR membrane tank are sequentially communicated from upstream to downstream; the pretreatment equipment is used for filtering and precipitating the sewage to be treated, the anoxic tank and the aerobic tank are connected in series to form an AO tank, and the sewage to be treated is biochemically treated. This high-quality high-efficient sewage treatment system, the operation is stable, can realize comparatively thorough processing to the sewage that treats, and the treatment effect is good, and the treatment effeciency is high. The invention also relates to a sewage treatment process.

Description

High-quality and high-efficiency sewage treatment system and sewage treatment process

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a high-quality and high-efficiency sewage treatment system and a sewage treatment process.

Background

Water is a source of life and also a necessary resource for production and life. The water resource problem seriously influences the sustainable development of economy and society. The sewage comprises domestic sewage, industrial sewage, runoff sewage and the like, the sewage problem in the current society is more and more serious, and the sustainability of the problem of water resources is seriously influenced.

The existing sewage treatment system and the related sewage treatment process cannot stably run for a long time, have poor running stability, and have incomplete sewage treatment, poor treatment effect and low treatment efficiency.

Disclosure of Invention

In view of the above, the present invention provides a sewage treatment system and a sewage treatment process, which are stable in operation and can perform high-quality and high-efficiency sewage treatment.

According to a first aspect of the invention, a high-quality and high-efficiency sewage treatment system is provided, which comprises pretreatment equipment, an anoxic tank, an aerobic tank and an MBR membrane tank, wherein the pretreatment equipment, the anoxic tank, the aerobic tank and the MBR membrane tank are communicated in sequence from upstream to downstream;

the pretreatment equipment is used for filtering and precipitating the sewage to be treated, the anoxic tank and the aerobic tank are connected in series to form an AO tank, and the sewage to be treated is biochemically treated.

Preferably, a first return flow channel is arranged between the MBR membrane tank and the anoxic tank and is used for returning the retentate of the MBR membrane tank to the anoxic tank;

and a second backflow channel is arranged between the MBR membrane tank and the aerobic tank and is used for returning the intercepted matters of the MBR membrane tank to the aerobic tank.

Preferably, the device further comprises an oxygen blower which is communicated with the aerobic tank so as to blow oxygen into the aerobic tank.

Preferably, an oxygen content detection sensor is arranged in the aerobic tank, the oxygen content detection sensor is interlocked with the oxygen blowing machine for control, the oxygen content detection sensor is used for detecting oxygen content information in the aerobic tank, and the oxygen blowing machine controls the oxygen blowing amount of the oxygen blowing machine to the aerobic tank according to the oxygen content information.

Preferably, an MBR membrane bioreactor is arranged in the MBR membrane tank.

Preferably, the device also comprises a desalting tank and a storage tank which are sequentially positioned at the downstream side of the MBR membrane tank,

the desalting tank is communicated with the MBR membrane tank, and the storage tank is communicated with the desalting tank.

Preferably, the pretreatment equipment comprises a shell, a treatment tank and a temporary storage tank, wherein the shell is provided with a water inlet pipe, the treatment tank and the temporary storage tank are sequentially communicated from upstream to downstream,

the treatment tank and the temporary storage tank are arranged in the shell, a partition plate is arranged on the bottom wall in the shell and extends to the water inlet pipe towards the upper part, the lower space in the shell is divided into the treatment tank and the temporary storage tank by the partition plate, the water inlet pipe and the temporary storage tank are respectively positioned at two opposite sides of the treatment tank, and the treatment tank is positioned below the water inlet pipe,

the treatment tank is internally provided with a filter plate, the partition plate is provided with a communicating pipe, the communicating pipe is used for communicating the treatment tank with the temporary storage tank, the communicating pipe is L-shaped and comprises a first pipe and a second pipe which are connected with each other, the first end of the first pipe is arranged on the partition plate in a penetrating way, the second end of the first pipe is connected with the second pipe, and the second pipe vertically extends downwards to a preset distance.

Preferably, the outer side wall of the shell is provided with a slag discharge port, the slag discharge port is positioned below the water inlet pipe and above the filter plate and communicated with the treatment tank, the upper cover of the slag discharge port is closed with a cover plate, the lower end of the cover plate is rotatably connected on the outer wall of the shell,

the cover plate is provided with an elastic rope which is used for providing elastic force for the cover plate so that the cover plate can turn towards the slag discharge hole and cover the slag discharge hole, one end of the elastic rope is connected to the outer side surface of the cover plate, the other end of the elastic rope is connected to the outer wall of the shell above the slag discharge hole,

the shell is internally provided with a turnover plate, the turnover plate is rotatably arranged at the upper end of the partition plate and comprises a first plate, a second plate and a third plate which are sequentially connected, the second plate is obliquely arranged relative to the first plate in the direction away from the first plate, the third plate is parallel to the first plate, the first plate is positioned on an opening at the upper part of the treatment pool, the second plate and the third plate are positioned above the temporary storage pool, a push clamp is arranged below the first plate, a push claw is rotatably connected on the bottom wall of the first plate and is used for pushing the cover plate when the turnover plate is turned over in the direction towards the treatment pool, a floating ball is also arranged below the filter plate in the treatment pool and is connected on the first plate through a connecting rod of the floating ball, the first end of the connecting rod is connected with the floating ball, and the second end of the connecting rod penetrates through the filter plate and is slidably connected with the bottom of the first plate, the connecting rods are slidable relative to the filter plates,

a guide plate is also arranged in the shell, the guide plate is covered at the opening at the upper end of the temporary storage tank in a sealing way, the upper part of the filter plate on the partition plate is provided with a guide port, the guide port is arranged corresponding to the slag discharge port, the first end of the guide plate is supported on the bottom wall of the guide port and penetrates into the treatment tank, the second end of the guide plate is fixed on the inner wall of the temporary storage tank far away from the partition plate,

the sewage treatment device is characterized in that a washing flow channel is formed between the turnover plate and the guide plate, when the turnover plate turns towards the treatment tank to be supported on the upper end surface of the treatment tank, the turnover plate covers an upper end opening of the treatment tank, sewage to be treated from the water inlet pipe is lifted to a certain height through the turnover plate and then flushed into the washing flow channel, and the washing flow channel impacts the filter plate to wash impurities on the filter plate.

According to a second aspect of the present invention, there is provided a wastewater treatment process comprising the steps of:

a) firstly, sewage to be treated enters a pretreatment tank for filtration and precipitation treatment, so that impurities in the sewage to be treated are removed, and sediment in the sewage is precipitated;

b) the sewage to be treated after filtration and sedimentation treatment enters the anoxic tank and the aerobic tank for biochemical treatment;

c) and the sewage to be treated after biochemical treatment enters the MBR membrane tank, clear water components in the sewage enter the next treatment flow after penetrating through the MBR membrane, and activated sludge and macromolecular organic matters are intercepted in the MBR membrane tank.

Preferably, the retentate in the MBR membrane tank respectively flows back to the anoxic tank and the aerobic tank for circulation treatment.

The high-quality and high-efficiency sewage treatment system provided by the invention is stable in operation, can realize thorough treatment on sewage to be treated, and has good treatment effect and high treatment efficiency.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.

Fig. 1 shows a schematic structural view of a high-quality and high-efficiency sewage treatment system according to an embodiment of the present invention.

FIG. 2 is a schematic view showing the construction of a pretreatment apparatus for a high-quality and high-efficiency sewage treatment system according to an embodiment of the present invention (with a flap plate opened and a filter plate in a normal use state).

Fig. 3 shows an enlarged view of a portion a in fig. 2.

FIG. 4 is a schematic view showing the construction of a pretreatment apparatus of a high-quality and high-efficiency sewage treatment system according to an embodiment of the present invention (the inversion plate closes the pipe, and the filter plate is in a washing treatment state).

Fig. 5 shows an enlarged view of a portion B in fig. 4.

FIG. 6 shows a flow chart of steps of a wastewater treatment process according to an embodiment of the invention.

In the figure: the device comprises a sewage source 100 to be treated, pretreatment equipment 1, a shell 11, a slag discharge port 111, a cover plate 112, an elastic rope 113, a treatment tank 12, a slope 121, a sand discharge port 122, a temporary storage tank 13, a partition plate 14, a flow guide port 141, a support block 142, a turnover plate 15, a water inlet pipe 16, a flow guide plate 17, a floating ball 18, a connecting rod 19, a push claw 101, a first limit block 102, a second limit block 103, a filter plate 104, an elastic sliding sleeve 1041, a communicating pipe 105, a connecting pipe 106, a pull rope 107, an anoxic tank 2, an aerobic tank 3, an MBR membrane tank 4, a desalination tank 5, a storage tank 6, an oxygen blower 7, a first return channel 81, a second return channel 82, a water storage tank 9, a fixing plate 91 and a.

Detailed Description

Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.

Description of the drawings: the upstream and downstream are defined in the present invention in terms of the direction of flow of the sewage to be treated.

Fig. 1 shows a schematic structural view of a high-quality and high-efficiency sewage treatment system according to an embodiment of the present invention. As shown in fig. 1, the high-quality and high-efficiency sewage treatment system comprises a pretreatment device 1, an anoxic tank 2, an aerobic tank 3 and an MBR membrane tank 4, wherein the pretreatment device 1, the anoxic tank 2, the aerobic tank 3 and the MBR membrane tank 4 are sequentially communicated from upstream to downstream; the pretreatment device 1 is used for filtering and precipitating sewage to be treated, the anoxic tank 2 and the aerobic tank 3 are connected in series to form an AO tank, and biochemical treatment is carried out on the sewage to be treated.

Referring to fig. 2 to 5, the pretreatment apparatus 1 includes a housing 11, a treatment tank 12 and a temporary storage tank 13, wherein the housing 11 is provided with a water inlet pipe 16, and the water inlet pipe 16, the treatment tank 12 and the temporary storage tank 13 are sequentially communicated from upstream to downstream. The treatment tank 12 and the temporary storage tank 13 are arranged in the shell 11, a partition plate 14 is arranged on the bottom wall in the shell 11, and the partition plate 14 extends upwards to the water inlet pipe 16. In this embodiment, the baffle 14 is substantially flush with the bottom of the inner wall of the water inlet. The partition 14 divides the lower space in the housing 11 into the treatment tank 12 and the temporary storage tank 13, the inlet pipe 16 and the temporary storage tank 13 are respectively located at opposite sides of the treatment tank 12, and the treatment tank 12 is located below the inlet pipe 16.

Wherein, a filter plate 104 is arranged in the treatment tank 12, a communicating pipe 105 is arranged on the baffle plate 14, the communicating pipe 105 is positioned at the lower part of the filter plate 104, and the communicating pipe 105 is used for communicating the treatment tank 12 with the temporary storage tank 13. In this embodiment, the connection pipe 105 is L-shaped, and includes a first pipe and a second pipe that are vertically connected to each other, a first end of the first pipe extends along a horizontal direction, that is, the first pipe penetrates through the partition plate 14 in a direction perpendicular to the partition plate 14, a second end of the first pipe is connected to the second pipe, and the second pipe extends downward to a predetermined distance. The housing 11 is further provided with a connecting pipe 106, the connecting pipe 106 is communicated with the temporary storage tank 13, and the connecting pipe 106 is used for connecting with a downstream pipeline, for example, the downstream pipeline is communicated with a water pump. The shape and arrangement of the connection pipe 106 are substantially the same as those of the communication pipe 105, and reference may be made to the communication pipe 105 in particular, but the height of the connection pipe 106 is slightly lower than that of the communication pipe 105.

Furthermore, the bottom of the treatment tank 12 is provided with a slope 121, the shell 11 is provided with a sand discharge port 122 communicated with the treatment tank 12, the slope 121 gradually decreases in gradient from the partition plate 14 to the sand discharge port 122, and the sand discharge port 122 is located at the bottom of the slope. The slope 121 is used for settling the sewage entering the treatment tank 12 from the filter plate 104, settling silt components in the sewage on the slope 121, and discharging the sewage when the settling amount of the silt reaches a certain degree. Furthermore, a slag discharge port 111 is formed in the outer side wall of the shell 11, the slag discharge port 111 is located below the water inlet pipe 16 and is communicated with the treatment tank 12, and the slag discharge port 111 is arranged close to the water inlet pipe 16. The slag discharge port 111 is covered with a cover plate 112, wherein the lower end of the cover plate 112 is rotatably connected to the outer wall of the housing 11, an elastic rope 113 is arranged on the cover plate 112, and the elastic rope 113 is used for providing elastic force for the cover plate 112 so that the cover plate 112 can turn towards the slag discharge port 111 and cover the slag discharge port 111. One end of the elastic cord 113 is connected to the outer side surface of the cover plate 112, and the other end is connected to the outer wall of the shell 11 above the slag discharge port 111.

Still be equipped with returning face plate 15 in the casing 11, returning face plate 15 is rotatable to be located the upper end of baffle 14, returning face plate 15 is including the first board, second board and the third board that connect gradually, and the lower extreme of second board is connected with the hinged end of first board, and the upper end and the third board of second board are connected, the relative first board orientation of second board sets up towards the direction slope of keeping away from this first board, specifically is the relative first board orientation of upper end of second board and keeps away from the direction of this first board and extend towards the top slope, and the contained angle between first board and the second board is the obtuse angle promptly to, the relative first board of second board extends towards the interior roof of casing 11. The third plate is arranged in parallel with the first plate, the first plate is positioned on an upper opening of the treatment tank 12, the second plate and the third plate are positioned above the temporary storage tank 13, a push claw 101 is arranged below the first plate, the push claw 101 is rotatably connected to the bottom wall of the first plate, and the push claw 101 is used for pushing the cover plate 112 when the turnover plate 15 is turned over towards the treatment tank 12, so that the flushing water flow flushes the impurities on the filter plate 104. A floating ball 18 is further disposed below the filter plate 104 in the treatment tank 12, the floating ball 18 is connected to the first plate through a connecting rod 19, the connecting rod 19 is located between the push claw 101 and the partition plate 14, a first end of the connecting rod 19 is connected to the floating ball 18, a second end (i.e., an upper end) of the connecting rod 19 passes through the filter plate 104 and is slidably connected to the bottom of the first plate, and the connecting rod 19 is slidable relative to the filter plate 104. The floating ball 18 has a certain mass, and the sum of the masses of the first plate and the floating ball 18 is larger than the sum of the masses of the second plate and the third plate.

Furthermore, a limiting structure is arranged on one surface, facing the filter plate 104, of the first plate of the turnover plate 15, and is used for limiting the push claw 101. The limiting structure comprises a first limiting block 102 and a second limiting block 103, the first limiting block 102 and the second limiting block 103 are respectively located on two sides of the push claw 101, wherein the first limiting block 102 is closer to the slag discharge opening 111 relative to the second limiting block 103, and the second limiting block 103 is located between the push claw 101 and the connecting rod 19. In this embodiment, the axis of the rotating shaft of the pushing claw 101 is perpendicular to the sliding direction of the second end, i.e., the upper end tip, of the connecting rod 19. The pushing claw 101 is of a hook-shaped structure, the lower end of the pushing claw is bent towards the slag discharge port 111, and an extrusion ball is arranged at the end head of the lower end of the pushing claw 101 and is used for being in extrusion contact with the cover plate 112. In this way, when the turnover plate 15 is turned over toward the treatment tank 12, that is, turned over onto the upper end surface of the treatment tank 12 in the counterclockwise direction in fig. 2, the second limiting block 103 can enable the pushing claw 101 to be pushed and slid toward the cover plate 112 to push the cover plate 112 open, rather than enabling the lower end of the pushing claw 101 to be slid toward the side away from the cover plate 112, and during the process that the claw presses the cover plate 112, the first limiting block 102 can limit the pressing angle of the pushing claw 101, so as to prevent the pushing claw from being pressed down excessively and not providing a pressing force turning toward the outside for the cover plate 112; in addition, the two limiting blocks can enable the pushing claw 101 to swing within a preset angle, and in the process of opening the turnover plate 15, namely, when the turnover plate is turned over clockwise in fig. 2, the pushing claw can smoothly break away from the slag discharge port 111, so that interference between the pushing claw and the slag discharge port 111 is avoided.

In this embodiment, the first side of the filter plate 104 is rotatably connected to the inner wall of the housing 11, i.e., the treatment tank 12, which is disposed opposite to the partition 14, and the rotation shaft of the filter plate 104 is disposed below the slag discharge port 111 and adjacent to the slag discharge port 111. On the inner wall of the treatment tank 12, in particular on the side of the partition 14 facing the treatment tank 12, support blocks 142 are provided for supporting the second sides of the filter plates 104, the filter plates 104 being arranged horizontally when the filter plates 104 are supported on the support plates. In addition, be equipped with elastic sliding sleeve 1041 on the filter 104, this elastic sliding sleeve 1041 specifically can be made by rubber materials, and connecting rod 19 passes elastic sliding sleeve 1041 to can slide relative elastic sliding sleeve 1041, so, make connecting rod 19 can be relatively filter 104 swing in predetermineeing the angle.

A guide plate 17 is further arranged in the shell 11, the guide plate 17 covers the opening at the upper end of the temporary storage tank 13, a guide port 141 is formed in the upper portion of the filter plate 104 on the partition plate 14, the guide port 141 is correspondingly arranged at the slag discharge port 111, a first end of the guide plate 17 is supported on the bottom wall of the guide port 141 and penetrates into the treatment tank 12, and a second end of the guide plate 17 is fixed on the wall of the temporary storage tank 13 far away from the partition plate 14. In this embodiment, the diversion plate 17 includes a first flat plate, an inclined plate and a second flat plate which are connected in sequence, the first flat plate and the second flat plate are arranged in parallel, the first flat plate is located at the lower part of the second flat plate, and the inclined plate is arranged in an inclined manner relative to the first flat plate and the second flat plate. The end of the first flat plate passes through the diversion opening 141 and is supported on the bottom wall of the diversion opening 141, and the end of the second flat plate is fixed on the inner wall of the temporary storage tank 13 opposite to the partition plate 14.

A washing flow channel is formed between the second plate of the turnover plate 15 and the guide plate 17, when the turnover plate 15 is turned over towards the direction of the treatment tank 12 and is supported on the upper end surface of the treatment tank 12, the turnover plate 15 seals the upper end opening of the treatment tank 12, and sewage to be treated from the water inlet pipe 16 is lifted to a certain height from the turnover plate 15 and then flushed into the washing flow channel, and is impacted on the filter plate 104 from the washing flow channel to wash impurities on the filter plate 104.

Furthermore, a water storage tank 9 is arranged in the shell 11, and the water storage tank 9 is connected to the inner wall of the shell 11 through a fixing plate 91 of the water storage tank. Specifically, the water storage tank 9 is located between the second flat plate of the guide plate 17 and the third flat plate of the turnover plate 15, the first end of the fixing plate 91 is fixed on the inner wall of the housing 11, the bottom of the water storage tank 9 is rotatably connected to the second end of the fixing plate 91, wherein the rotating shaft of the water storage tank 9 is eccentrically arranged, that is, the rotating shaft of the water storage tank 9 is arranged in a direction deviating from the gravity center line of the rotating shaft to the first end of the fixing plate 91. Be connected with spring 92 between catch basin 9 and fixed plate 91, the first end of spring 92 is connected on the outer wall of catch basin 9, the second end is connected in the first end of fixed plate 91, spring 92 is used for providing predetermined pulling force to catch basin 9, so that catch basin 9 overcomes the pulling force of overcoming spring 92 when reaching the water storage capacity of predetermineeing weight and realizes the upset, thereby make the water in the catch basin 9 rush out in the twinkling of an eye, form great kinetic energy, thereby rush out the debris on the filter 104, this debris specifically is debris such as leaf, weeds.

Further, a pulling rope 107 is connected between the turnover plate 15 and the filter plate 104. Specifically, a sliding hole is formed in the end of the first end of the baffle 17, the first end of the pull rope 107 is connected to the surface of the second plate of the turnover plate 15, which faces one side of the baffle 17, and the second end of the pull rope 107 sequentially penetrates through the flow guide port 141 and the sliding hole and is connected to the second side edge of the filter plate 104.

In this embodiment, referring to fig. 2 and 3, when the filter plate 104 is in a normal use state, the water level in the treatment tank 12 is higher than the communication pipe 105, the floating ball 18 is at least partially immersed in the water, the floating ball 18 floats upwards under the buoyancy of the water, so as to drive the turnover plate 15 to turn over to a position where the first plate thereof is separated from the upper end surface of the treatment tank 12, an opening is formed between the turnover plate 15 and the upper end surface of the treatment tank 12, and the opening communicates the water inlet pipe 16 with the treatment tank 12, so as to realize water inlet of the treatment tank 12.

Referring to fig. 4 and 5, when the filtering plates 104 are used for a long time and cannot be used normally due to a large amount of impurities accumulated thereon, the water level in the treating tank 12 gradually decreases, the floating ball 18 drops along with the water level, and the floating ball 18 drives the turnover plate 15 to turn over to the position where the first plate is overlapped and supported on the upper end surface of the treating tank 12 under the action of the self gravity. At this moment, inlet tube 16 through the returning face plate 15 with wash the runner intercommunication, pending sewage flows through inlet tube 16 in proper order, returning face plate 15 gets into catch basin 9, treat when the water yield in the catch basin 9 reaches preset weight, the direction upset of runner is washed to the pulling force orientation that spring 92 was overcome to catch basin 9, thereby make the water in the catch basin 9 wash out in the twinkling of an eye, form great kinetic energy, thereby wash out the debris on the filter 104, this debris can be leaf branch, debris such as weeds, the realization is to washing of filter 104, make filter 104 resume filtering capability.

The pretreatment apparatus 1 can realize an automatic cleaning function, thereby realizing automatic recovery of a filtering function.

The anoxic tank 2 and the aerobic tank 3 both adopt a biological biofilm formation mode. An MBR membrane bioreactor is arranged in the MBR membrane tank 4, and the MBR membrane body adopts a hollow fiber curtain type ultrafiltration membrane, so that effective interception of activated sludge and suspended matters can be realized.

Further, a first return flow channel 81 is arranged between the MBR membrane tank 4 and the anoxic tank 2 and is used for returning the retentate of the MBR membrane tank 4 to the anoxic tank 2; and a second backflow channel 82 is arranged between the MBR membrane tank 4 and the aerobic tank 3 and is used for returning the intercepted matters of the MBR membrane tank 4 to the aerobic tank 3. Sludge return pumps are respectively arranged on the first return channel 81 and the second return channel 82 to realize sludge return.

Further, the high-quality and high-efficiency sewage treatment system also comprises an oxygen blower 7, wherein the oxygen blower 7 is communicated with the aerobic tank 3 so as to blow oxygen into the aerobic tank 3. Specifically, the oxygen blower 7 and the aerobic tank 3 can be connected by an oxygen conveying pipe. An oxygen content detection sensor (not shown) is arranged in the aerobic tank 3, is arranged in the aerobic tank 3 and is in linkage control with the oxygen blower 7, and is used for detecting the oxygen content information in the aerobic tank 3 and transmitting the oxygen content information to a control device of the high-quality high-efficiency sewage treatment system, and the control device controls the oxygen blowing amount of the oxygen blower 7 according to the oxygen content information.

Further, the high-quality and high-efficiency sewage treatment system also comprises a desalting tank 5 and a storage tank 6, wherein the desalting tank 5 and the storage tank 6 are sequentially positioned on the downstream side of the MBR membrane tank 4. Wherein the desalting tank 5 is communicated with the MBR membrane tank 4, and the storage tank 6 is communicated with the desalting tank 5. The desalting tank 5 is used for desalting the sewage to be treated from the upstream, so that the sewage entering the high-quality high-efficiency sewage treatment system is finally treated completely to become reusable water. The reusable water enters the storage tank 6 from the desalting tank 5 for standby.

The invention also relates to a sewage treatment process which is carried out by utilizing the high-quality and high-efficiency sewage treatment system in the embodiment, and the sewage treatment process comprises the following steps:

s01), the sewage to be treated firstly enters a pretreatment tank 12 for filtration and sedimentation treatment, thereby removing impurities in the sewage to be treated and carrying out sedimentation treatment on silt in the sewage;

specifically, the sewage to be treated enters the treatment tank 12 from an inlet pipe 16, an opening formed between an overturning plate 15 and the upper end surface of the treatment tank 12 after being lifted by a water pump from a sewage source 100 to be treated, enters the lower part of a filter plate 104 after being filtered by the filter plate 104 for precipitation treatment, and enters the temporary storage tank 13 after being subjected to precipitation treatment.

S02), the sewage to be treated after filtration and sedimentation treatment sequentially enters the anoxic tank 2 and the aerobic tank 3 for biochemical treatment;

specifically, the sewage to be treated in the temporary storage tank 13 is lifted by a water pump and then sequentially enters the anoxic tank 2 and the aerobic tank 3 for biochemical treatment, wherein DO in the anoxic tank 2 is 0.17-0.20mg/L, and DO in the aerobic tank 3 is 2.20-3.90 mg/L. Heterotrophic bacteria in the anoxic pond 2 hydrolyze suspended matters such as carbohydrates, fibers, starch and the like and soluble organic matters in the sewage to be treated into organic acid, decompose macromolecular organic matters into micromolecular organic matters, and convert insoluble organic matters into soluble organic matters; in addition, heterotrophic bacteria ammoniate contaminants such as fats and proteins, freeing them from ammonia.

S03), the sewage to be treated after biochemical treatment enters the MBR membrane tank 4, clear water components in the sewage penetrate through the MBR membrane and then enter the next treatment process, and activated sludge and macromolecular organic matters are intercepted in the MBR membrane tank 4;

in the step, clear water components pass through an MBR membrane and then enter the interior of the MBR membrane bioreactor, and components such as macromolecular organic matters and activated sludge are intercepted in an MBR membrane tank 4. The intercepted components flow back to the anoxic tank 2 through the first return passage 81 and flow back to the aerobic tank 3 through the second return passage 82, so that the sewage to be treated is circularly and thoroughly treated.

S04), enabling the clear water component to pass through an MBR membrane and then enter the interior of the MBR membrane bioreactor, and enabling the clear water component to pass through a pipeline arranged on the MBR membrane and then enter a desalting tank 5 for desalting treatment;

s05), and enabling the water component subjected to desalination treatment to enter a storage tank 6 for later use.

The high-quality and high-efficiency sewage treatment system in the application runs stably, can realize relatively thorough treatment on sewage to be treated, is good in treatment effect and high in treatment efficiency, and can be seen in the following table I.

Index of water quality	SS	COD	Ammonia nitrogen	PH
					Unit of	mg/L	mg/L	mg/L	Is free of
Inflow water	55	140	30	7-8.6
					Discharging water	6	39	7	7-9

Watch 1

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.

Claims (9)

1. A high-quality and high-efficiency sewage treatment system is characterized by comprising pretreatment equipment, an anoxic tank, an aerobic tank and an MBR membrane tank, wherein the pretreatment equipment, the anoxic tank, the aerobic tank and the MBR membrane tank are sequentially communicated from upstream to downstream;

the pretreatment device is used for filtering and precipitating the sewage to be treated, the anoxic tank and the aerobic tank are connected in series to form an AO tank, and the sewage to be treated is biochemically treated.

2. The high-quality high-efficiency sewage treatment system according to claim 1, wherein a first return flow channel is arranged between the MBR membrane tank and the anoxic tank and is used for returning the retentate of the MBR membrane tank to the anoxic tank;

and a second backflow channel is arranged between the MBR membrane tank and the aerobic tank and is used for returning the intercepted matters of the MBR membrane tank to the aerobic tank.

3. A high quality and high efficiency wastewater treatment system according to claim 1, further comprising an oxygen blower communicating with said aerobic tank for blowing oxygen into said aerobic tank.

4. A high quality and high efficiency sewage treatment system according to claim 3 wherein said aerobic tank is provided with an oxygen content sensor, said oxygen content sensor is interlocked with said oxygen blower for control, said oxygen content sensor is used to detect the oxygen content information in said aerobic tank, said oxygen blower controls the amount of oxygen blown into said aerobic tank by said oxygen blower according to the oxygen content information.

5. The high-quality high-efficiency sewage treatment system according to claim 1, wherein an MBR membrane bioreactor is arranged in the MBR membrane tank.

6. A high quality and high efficiency sewage treatment system according to claim 1, further comprising a desalination tank and a storage tank, which are located at the downstream side of said MBR membrane tank in sequence;

the desalting tank is communicated with the MBR membrane tank, and the storage tank is communicated with the desalting tank.

7. A high quality and high efficiency sewage treatment system according to claim 1 wherein said pretreatment apparatus comprises a housing, a treatment tank and a temporary storage tank, said housing having an inlet pipe, said inlet pipe, treatment tank and temporary storage tank being in communication in sequence from upstream to downstream;

the treatment tank and the temporary storage tank are arranged in the shell, a partition plate is arranged on the bottom wall in the shell and extends to the water inlet pipe towards the upper part, the lower space in the shell is divided into the treatment tank and the temporary storage tank by the partition plate, the water inlet pipe and the temporary storage tank are respectively positioned on two opposite sides of the treatment tank, and the treatment tank is positioned below the water inlet pipe;

the treatment tank is internally provided with a filter plate, the partition plate is provided with a communicating pipe, the communicating pipe is used for communicating the treatment tank with the temporary storage tank, the communicating pipe is L-shaped and comprises a first pipe and a second pipe which are connected with each other, the first end of the first pipe is arranged on the partition plate in a penetrating way, the second end of the first pipe is connected with the second pipe, and the second pipe vertically extends downwards to a preset distance.

8. A sewage treatment process which is completed by using the high-quality and high-efficiency sewage treatment system according to any one of claims 1 to 7, and is characterized by comprising the following steps:

a) firstly, sewage to be treated enters a pretreatment tank for filtration and precipitation treatment, so that impurities in the sewage to be treated are removed, and sediment in the sewage is precipitated;

b) the sewage to be treated after filtration and sedimentation treatment enters the anoxic tank and the aerobic tank for biochemical treatment;

c) and the sewage to be treated after biochemical treatment enters the MBR membrane tank, clear water components in the sewage enter the next treatment flow after penetrating through the MBR membrane, and activated sludge and macromolecular organic matters are intercepted in the MBR membrane tank.

9. The sewage treatment process of claim 8, wherein the retentate in the MBR membrane tank is respectively returned to the anoxic tank and the aerobic tank for circulation treatment.

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