CN115140892B - Integrated skid-mounted wastewater treatment equipment - Google Patents

Abstract

The invention provides integrated skid-mounted wastewater treatment equipment, which comprises a skid-mounted chassis, and a wastewater inlet unit, a pretreatment unit, a biological treatment unit, a final sedimentation unit, a sludge concentration unit and a sludge dewatering unit which are arranged on the skid-mounted chassis, wherein wastewater sequentially passes through the wastewater inlet unit, the pretreatment unit, the biological treatment unit, the final sedimentation unit and a filtration and disinfection unit; and after the sludge discarded by the final sedimentation unit is deposited, concentrating the sludge by a sludge concentrating unit, and dehydrating the concentrated sludge by a sludge dehydrating unit. When the primary sedimentation tank is in a low liquid level state, the side wall and the bottom plate of the upper tank body are treated by the primary sedimentation tank by utilizing the scouring action so as to scour sludge into the lower sludge tank, thereby omitting the manual treatment of the primary sedimentation tank.

Description

Integrated skid-mounted wastewater treatment equipment

technical field

The invention belongs to the technical field of sewage treatment equipment, and in particular relates to an integrated skid-mounted sewage treatment equipment.

Background technique

Sewage sources can be roughly divided into domestic sewage and industrial sewage. If it is discharged directly to the water body without treatment, it will exceed the load of the water body and cause water pollution. Therefore, in order to prevent and control water pollution, how to treat sewage has become an important issue. . Domestic sewage contains a large amount of organic substances, which may produce stench and other phenomena due to its instability and perishability, and may contain various pathogenic bacteria. Most of the organic matter in domestic sewage is biodegradable and non-biologically toxic substances, so most of the urban domestic sewage treatment uses biological treatment procedures to treat domestic sewage to remove organic matter and nutrients in urban domestic sewage to achieve water purification the goal of. The current processing method is to adopt the method of centralized collection and processing. It has the disadvantages of large single recovery amount and high processing cost.

Sewage treatment generally includes sedimentation tanks, which generally settle the solid part of the sewage by gravity. Because in the prior art, domestic sewage is generally discharged into the sewage treatment equipment at a single, unspecified location, the solids in the domestic sewage may accumulate unevenly on the wall and bottom of the sedimentation tank, and the solids in the sedimentation tank are removed. Sludge may require manual intervention.

Contents of the invention

The present invention aims to solve the above technical problems, and provides an integrated skid-mounted wastewater treatment equipment, which can realize the self-cleaning of the sludge in the sedimentation tank.

In order to achieve the above object, the present invention adopts following technical scheme:

An integrated skid-mounted wastewater treatment equipment, including a skid-mounted chassis and a sewage water inlet unit, a pre-treatment unit, a biological treatment unit, a final sedimentation unit, a sludge concentration unit, and a sludge dewatering unit arranged on the skid-mounted chassis. Sewage water inlet unit, pre-treatment unit, biological treatment unit, final sedimentation unit, filtration and disinfection unit in sequence; after the sludge discarded in the final sedimentation unit is deposited, it is concentrated through the sludge concentration unit, and the concentrated sludge is processed through the sludge dehydration unit. dehydration;

The pre-treatment unit includes a primary settling tank, a second water separator is arranged above the primary settling tank, the primary settling tank is a tank, and an upper tank body and a lower sludge are arranged in the primary settling tank tank, the upper tank body includes an upper tank body bottom plate inclined to the lower sludge tank, the lower end of the second water separator is provided with a first water outlet for injecting sewage into the upper tank body, in the The upper pool body is provided with a ring of sewage water inlet near the upper edge, and the lower end of the second water separator is provided with a second water outlet for injecting water into the sewage water inlet. The sewage water inlet is arranged horizontally, and the sewage water inlet The water tank is provided with an overflow weir on the side close to the inside of the upper pool body, and the sewage water inlet tank is provided with a side wall of the sewage water inlet tank inclined to the pool wall of the upper pool body at the lower end of the overflow weir, so The overflow weir allows the overflowing sewage in the sewage inlet tank to flow to the side wall of the upper pool body along the outer wall of the overflow weir and the side wall of the sewage inlet tank, and the sewage inlet tank is provided with a sludge settlement tank, the sewage water inlet tank also includes a bottom plate of the sewage water inlet tank for guiding the sludge to the sludge settling tank, the sludge settling tank communicates with the lower sludge tank through a sludge pipeline, and the sludge There is a discharge valve on the mud pipeline.

As a preferred technical solution, the upper pool body is a cylindrical pool body, and the sewage inlet tank is an annular groove body extending along the entire wall surface of the upper pool body.

As a preferred technical solution, the sewage water inlet unit includes a sewage water pump and a trash retaining rough grid, the sewage water inlet pump pumps the sewage to the second water separator, and the sewage water pump is arranged on the The rear end of the trash rack.

As a preferred technical solution, the biological treatment unit includes sequentially connected anaerobic tank, the first aerobic tank, the first anoxic tank, the second aerobic tank, the second anoxic tank and the third aerobic tank , the first water separator is connected to the anaerobic tank, the first anoxic tank, and the second anoxic tank, and phosphorus accumulating bacteria are placed in the anaerobic tank, and 70% of the raw sewage separated by the first water separator enters the anaerobic tank , the effluent water from the anaerobic tank flows into the first aerobic tank, and nitrifying bacteria are placed in the first aerobic tank to oxidize, nitrify, and absorb phosphorus from the sewage, and the effluent water from the first aerobic tank is divided into the first water separator 20% of the raw sewage from the first anoxic pool enters the first anoxic pool, the first anoxic pool provides nitrogen source and performs denitrification and phosphorus release, and the effluent water from the first anoxic pool enters the second aerobic pool for oxidation and nitrification reactions again. The effluent water from the second aerobic tank and 10% raw sewage from the first water separator enter the second anoxic tank to supply the carbon source for the denitrification of the first anoxic tank and reduce the total nitrogen, and the outflow of the second anoxic tank The water enters the third aerobic tank to increase the dissolved oxygen and make the nitrification reaction more complete.

As a preferred technical solution, the final sedimentation unit includes a final sedimentation tank, the final sedimentation tank is a rectangular tank, and a mud scraper is provided at the bottom of the final sedimentation tank, and the final sedimentation tank The top of the tank is equipped with a scum scraper, and the sludge in the final sedimentation tank settles to the bottom of the tank by gravity, and the sludge at the bottom is scraped by the sludge scraper and collected into the sludge storage tank, which is connected to the biological treatment unit , A return sludge pump is set on the connecting pipeline between the sludge storage tank and the biological treatment unit.

As a preferred technical solution, the integrated skid-mounted wastewater treatment equipment also includes a filter disinfection unit, the filter disinfection unit includes a filter tank, a disinfection pipeline and a recovery tank, and an ultraviolet germicidal lamp is arranged in the disinfection pipeline, so The effluent water from the final sinking unit flows into the filter tank to be filtered, and then is sterilized by the ultraviolet germicidal lamp of the disinfection pipeline and falls to the recovery water tank.

As a preferred technical solution, the pre-treatment unit also includes a sand washing machine, and a sludge tank for guiding the sludge in the lower sludge tank to the sand washing machine is arranged between the sand washing machine and the lower sludge tank. A sludge pipeline comprising an n-shaped section.

As a preferred technical solution, the sludge thickening unit includes a sludge thickening feed pump and a sludge thickener, and the sludge thickening feed pump pumps the sludge in the sludge storage tank to the sludge thickener, and the sludge The polymer flocculant provided in the thickener is added and mixed, then thickened to increase the sludge concentration, and the concentrated filtrate from the sludge thickener is pumped back to the pre-treatment unit for reprocessing.

After adopting the technical scheme, the present invention has the following advantages:

When the primary settling tank is in a state of low liquid level, the primary settling tank of the present invention utilizes scouring action to treat the side wall and bottom plate of the upper tank body, so as to flush the sludge into the lower sludge tank, eliminating the need for manual cleaning of the primary settling tank. processing.

Description of drawings

Fig. 1 is a structural schematic diagram of an integrated skid-mounted wastewater treatment equipment;

Fig. 2 is a top view structural schematic diagram of an integrated skid-mounted wastewater treatment equipment;

Fig. 3 is the structural representation of primary settling tank;

Fig. 4 is the sectional schematic diagram of primary settling tank;

Fig. 5 is the structural representation of biological processing unit;

In the picture:

1-Skid-mounted chassis; 2-Sewage water inlet unit; 201-Coarse trash grid; 3-Pre-treatment unit; 301-Primary grit chamber; 3011-Upper tank body; Mud tank; 3013-sewage inlet tank; 30131-side wall of sewage inlet tank; 30132-sludge settling tank; 30133-bottom plate of sewage inlet tank; 3014-overflow weir; 401-anaerobic tank; 402-first aerobic tank; 403-first anoxic tank; 404-second aerobic tank; 405-second anoxic tank; 406-third aerobic tank; 5-final sink Unit; 6-filter disinfection unit; 7-second water separator; 701-first water outlet; 702-second water outlet; 8-sludge pipeline; 9-first water separator; 10-sand washing machine .

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1-2, an integrated skid-mounted wastewater treatment equipment includes a skid-mounted chassis 1 and a sewage water inlet unit 2, a pre-treatment unit 3, a biological treatment unit 4, and a final sedimentation unit installed on the skid-mounted chassis 1. Unit 5, filter disinfection unit 6, sludge thickening unit (not shown) and sludge dehydration unit (not shown). The sewage passes through the sewage water inlet unit 2 , the pretreatment unit 3 , the biological treatment unit 4 , the final sedimentation unit 5 , and the filter disinfection unit 6 . After being deposited in the final sedimentation unit 5, the discarded sludge is concentrated through the sludge concentration unit, and the concentrated sludge is dehydrated through the sludge dehydration unit. The sludge thickening unit and the sludge dehydration unit are arranged below the filter disinfection unit 6 .

The sewage water inlet unit 2 includes a sewage pump, which is connected to the sewage inlet of the pre-treatment unit 3 .

The sewage to be treated contains a large amount of garbage or large particles of debris, and the sewage water inlet unit is equipped with a rough trash bar 201 for pre-treatment of water inflow. Trash blocking coarse screen 201 is a special equipment for water treatment that can continuously and automatically intercept and remove various shapes of debris in the fluid. It is assembled into a set of rotary screen chains by a unique rake tooth factory. Driven by the motor reducer, the rake tooth chain rotates against the direction of water flow. When the rake tooth chain runs to the upper part of the equipment, due to the guidance of the grooved wheel and the curved rail, a relative self-cleaning movement occurs between each set of rake teeth, and most of the solid matter falls by gravity. The other part relies on the reverse movement of the cleaner to clean up the sundries stuck on the rake teeth. According to the water flow direction, the rake tooth chain is similar to the grille, and the rake tooth gap assembled on the rake tooth chain shaft can be selected according to the use conditions. When the rake teeth separate the solid suspended matter in the fluid, it can ensure the smooth flow of water. The whole working process is continuous or intermittent. The coarse trash bar 201 is arranged in front of the sewage pump to screen out coarse substances in the water and protect the sewage pump.

In another embodiment, the rough trash grid 201 is replaced by a screen.

The pretreatment unit 3 includes a primary grit chamber 301 . The most common grit removal methods for primary grit chambers 301 are gravity, which settles the grit down by reducing the velocity of the inflow, or centrifugation, which settles the grit in a sump by using annular channels/troughs or centrifugal impellers to separate the grit , so that the organic matter can move forward to the biological treatment unit.

The pre-treatment unit 3 also includes a sand washing machine 10 arranged under the primary grit chamber 301 . The sand washing machine 10 is connected to the bottom of the primary grit chamber 301, and the sand washing machine pumps the mortar separated from the primary grit chamber 301 into the sand washing machine, and collects the sand in the garbage sub-car for removal after washing. The connecting pipeline between the sand washing machine and the bottom of the primary grit chamber 301 is n-shaped, which can effectively suck out the solids separated by the primary grit chamber 301 while ensuring that less sewage is sucked. The sand washing filtrate of the sand washing machine is returned to the water inlet of the pretreatment unit 3 .

In this embodiment, the pre-treatment unit 3 further includes a fine trash grid 302 arranged in front of the primary grit chamber 301 . The function of the fine trash grid 302 is similar to that of the coarse trash grid 201, both of which intercept suspended impurities in the sewage, but there are differences in thickness between the two. The distance between the coarse trash grid 201 is 10- 20mm, and the fine trash grid 302 is between 5-10mm. A squeezer (not shown) is arranged below the fine trash grid 302, and the screened out objects of the fine trash grid 302 are squeezed by the squeezer and collected in a garbage sub-car for removal. The effluent water from the press is returned to the water inlet of the primary grit chamber 301 .

Since the sewage in the primary grit chamber 301 has not been biologically treated, solids will be unevenly accumulated on the walls and bottom of the primary grit chamber 301 . Therefore, adopt the primary grit chamber 301 of following structure, be used for the solid of primary grit chamber 301 pond wall and the bottom of the pond rush to the sludge tank at the bottom of primary grit chamber 301:

As shown in Fig. 3 and Fig. 4, the primary sedimentation tank 301 is a tank body, an upper tank body 3011 and a lower sludge tank 3012 are arranged in the primary sedimentation tank, and the upper tank body 3011 includes a The upper tank body floor 30111 of the mud tank 3012 is inclined.

A second water separator 7 is provided above the primary sedimentation tank 301 . The lower end of the second water separator 7 is provided with a first water outlet 701 for injecting sewage into the upper pool body, and a circle of sewage water inlet tank 3013 is provided near the upper edge of the upper pool body 3011. The lower end of the water distributor 7 is provided with a second water outlet 702 for injecting water into the sewage water inlet tank 3013 . Two second water outlets 702 are provided, and the two second water outlets 702 are respectively connected to two opposite water injection ports on the outer wall of the primary sedimentation tank 301 through water injection pipelines. The sewage injected by the water injection port flows into the sewage inlet tank 3013.

The sewage water inlet tank 3013 is arranged horizontally, and the sewage water inlet tank 3013 is provided with an overflow weir 3014 on the side close to the inside of the upper pool body 3011 . The sewage water inlet tank 3013 is provided with a sewage water inlet tank side wall 30131 inclined to the pool wall of the upper pool body 3011 at the lower end of the overflow weir 3014, and the overflow weir 3014 makes the sewage water inlet tank 3013 overflow The sewage flows to the sidewall of the upper pool body 301 along the outer wall of the overflow weir 3014 and the sidewall 30131 of the sewage inlet tank.

The upper pool body 3011 is a cylindrical pool body, and the sewage water inlet tank 3013 is an annular tank body extending along the entire wall surface of the upper pool body 3011 .

The sewage water inlet tank 3013 is provided with a sludge settling tank 30132, and the sewage water inlet tank 3013 also includes a sewage water inlet tank bottom plate 30133 for guiding the sludge to the sludge sedimentation tank 30132, and the sludge settlement tank 30132 It communicates with the lower sludge tank 3012 through the sludge pipeline 8, and the sludge pipeline 8 is provided with a discharge valve. There are two sludge settling tanks 30132, and the two sludge settling tanks 30132 are arranged oppositely at both ends of the sewage water inlet tank 3013. The bottom plate 30133 of the sewage water inlet tank is slope-shaped, and the bottom plate 30133 of the sewage water inlet tank is arranged on the two sludge settling tanks Between 30132.

During normal operation of the primary settling tank 301, the liquid level in the primary settling tank 301 may rise above the top of the sewage water inlet tank 3013, which is desirable.

When the primary settling tank 301 is in a low liquid level state, the primary settling tank 301 treats the side wall and bottom plate of the upper tank body 3011 by flushing to wash the sludge into the lower sludge tank 3012 . The second water separator 7 is controlled to discharge the sewage into the sewage water inlet tank 3013. The second water separator 7 has the ability to adjust the flow rate of the sewage water inlet tank 3013, so that the primary sedimentation tank 301 has the necessary flushing level. The sewage flowing out from the first water outlet 701 and the second water outlet 702 flows into the upper pool body 3011 and the sewage water inlet tank 3013 respectively by gravity. The sewage inlet tank 3013 extends horizontally to the entire wall surface of the upper pool body 3011 to provide flushing for the side walls and the bottom plate of the entire upper pool body 3011 . The sewage flowing down from the flushing impacts downward in the form of a cone, and collides at the lower sludge tank 3012, which causes turbulent flow, thereby reducing the water flow velocity.

Sewage flows into the sewage water inlet tank 3013 and rises until it overflows the entire length of the overflow weir 3014, and enters the upper pool body 301 in the form of a thin layer. The outflowing sewage flows along the outer surface of the overflow weir 3014 to the inclined side wall of the sewage inlet tank 3013, flows along the side wall 30131 of the sewage inlet tank to the side wall of the upper pool body 3011, and flows along the side wall of the upper pool body 3011 to the bottom plate of the upper pool body 30111, and flow to the bottom sludge tank 3012.

The sewage inlet tank 3013 has a sludge settling tank 30132 with a valve, which is directly connected to the lower sludge tank 3012 through the sludge pipeline 8 . In addition, the bottom plate 30133 of the sewage water inlet tank is inclined downward toward the sludge settling tank 30132 to facilitate the discharge of sludge in the sewage water inlet tank 3013 .

As shown in Figure 5, a first water separator 9 is provided between the biological treatment unit 4 and the primary grit chamber 3, and the first water separator 9 divides the raw sewage in the primary grit chamber 301 into three parts of the following ratio: 70 %, 20%, 10%.

The biological treatment unit 4 includes an anaerobic tank 401 , a first aerobic tank 402 , a first anoxic tank 403 , a second aerobic tank 404 , a second anoxic tank 405 and a third aerobic tank 406 connected in sequence.

The anaerobic pool 401, the first anoxic pool 403, and the second anoxic pool 405 are all closed reaction tanks, and the complex organic matter in the wastewater is decomposed into stable matter by anaerobic microorganisms. Organic matter can be used as food for microorganisms such as carbohydrates, proteins, fats, etc., and is decomposed into simple and stable substances such as methane and carbon dioxide through anaerobic reactions.

The reaction in the first aerobic pool 402, the second aerobic pool 404, and the third aerobic pool 406 is that organic matter containing carbon, nitrogen, and sulfur synthesize microbial cells and carbon dioxide, water, and sulfuric acid with oxygen under the action of aerobic bacteria By-products such as root ions.

The final sedimentation unit 5 is connected to the anaerobic tank 401 , and a part of the sludge deposited in the final sedimentation unit 5 flows back to the anaerobic tank 401 . The primary grit chamber 301 is connected to the anaerobic pond 401 , and 70% of the raw sewage in the primary grit chamber 301 passes through the first water separator 9 and enters the anaerobic pond 401 . Phosphorus accumulating bacteria are placed in the anaerobic pool 401, and the phosphorus accumulating bacteria are used to release phosphorus under anaerobic conditions. At the same time, they absorb a large amount of carbon sources and enter the first aerobic pool 402 for nitrification and phosphorus uptake.

The effluent water from the anaerobic tank 401 flows into the first aerobic tank 402, and nitrifying bacteria are placed in the first aerobic tank 402 to oxidize, nitrify and absorb phosphorus in the sewage.

The primary grit chamber 301 is connected to the first anoxic pond 403 , and 20% of the raw sewage separated from the primary grit chamber 301 by the first water separator 9 enters the first anoxic pond 403 . The effluent water from the first aerobic tank 402 and 20% of the raw sewage in the primary grit chamber 301 enter the first anoxic tank 403 . The first anoxic tank 403 provides nitrogen source and performs denitrification and phosphorus release.

The effluent water from the first anoxic tank 403 enters the second aerobic tank 404 to undergo oxidation and nitrification reactions again. The second aerobic pool 404 nitrifies the ammonia nitrogen in the remaining 20% of the raw sewage.

The primary grit chamber 301 is connected to the second anoxic pond 405 , and 10% of the raw sewage separated from the primary grit chamber 301 by the first water separator 9 enters the second anoxic pond 405 . The effluent water from the second aerobic tank 404 enters the second anoxic tank 405 to supply the second anoxic tank 405 with a carbon source for denitrification and to reduce total nitrogen.

The effluent water from the second anoxic tank 405 enters the third aerobic tank 406 to increase the dissolved oxygen and make the nitrification reaction more complete. The third aerobic tank 406 oxidizes the remaining carbon source.

Since there is no need to return the digested liquid for denitrification, it can save energy. At the same time, only 10% of the ammonia nitrogen is not denitrified after nitrification, and the denitrification rate is as high as 90% without calculating the amount of returned sludge.

The biological treatment unit 4 is composed of anaerobic tank 401, the first aerobic tank 402, the first anoxic tank 403, the second aerobic tank 404, the second anoxic tank 405 and the third aerobic tank 406 in series, without backflow In the case of aerobic nitrification liquid, the total nitrogen removal efficiency can be improved by combining the step inflow with the activated sludge process without reducing the total phosphorus removal effect.

In this embodiment, there are two sets of final sinking units 5 . The final sedimentation unit 5 includes a final sedimentation tank and a V-shaped overflow port arranged on the top of the final sedimentation tank. There is a mud scraper at the bottom of the final sedimentation tank, and a scum scraper at the top of the final sedimentation tank. The sludge in the final settling tank is settled to the bottom of the tank by gravity, and the sludge at the bottom is scraped by the sludge scraper and then collected into the sludge storage tank. The sludge storage tank is connected to the anaerobic tank, and a return sludge pump is arranged on the connecting pipeline between the sludge storage tank and the anaerobic tank 401 .

The sludge thickening unit includes a sludge thickening feed pump and a sludge thickener. In this embodiment, the sludge thickening feed pump is a single-shaft screw feed pump. The sludge thickening feed pump pumps the sludge in the sludge storage tank to the sludge thickener, and the polymer flocculant is provided in the sludge thickener to add and mix, then thicken to increase the sludge concentration. The sludge thickened by the sludge thickener is pumped to the sludge dewatering unit. The concentrated filtrate from the sludge thickener is pumped back to the pretreatment unit for reprocessing.

The sludge dewatering unit includes a centrifugal sludge dewatering machine and a sludge storage hopper. The dewatered cake is stored in the sludge storage hopper, and the dehydrated filtrate of the sludge dewatering unit is returned to the water inlet of the primary grit chamber 301 .

The filter disinfection unit 6 is connected with the final sink unit 5 . In this embodiment, there are two groups of filter disinfection units 6 . The filter disinfection unit 6 includes a filter tank, a disinfection pipeline and a recovery water tank. The effluent water from the final sink unit 5 flows into the filter tank to be filtered, and then is sterilized by the ultraviolet germicidal lamp of the disinfection pipeline and then falls to the recovery water tank.

Except above-mentioned preferred embodiment, the present invention also has other embodiments, and those skilled in the art can make various changes and deformations according to the present invention, as long as they do not depart from the spirit of the present invention, all should belong to the scope defined in the appended claims of the present invention scope.

Claims (8)

1. The integrated skid-mounted wastewater treatment device comprises a skid-mounted chassis and is characterized by further comprising a wastewater inlet unit, a pretreatment unit, a biological treatment unit, a final sedimentation unit, a sludge concentration unit and a sludge dewatering unit which are arranged on the skid-mounted chassis, wherein wastewater sequentially passes through the wastewater inlet unit, the pretreatment unit, the biological treatment unit, the final sedimentation unit and a filtration and disinfection unit; after the sludge discarded by the final sedimentation unit is deposited, concentrating the sludge by a sludge concentrating unit, and dehydrating the concentrated sludge by a sludge dehydrating unit;

the pretreatment unit comprises a primary sedimentation tank, a second water separator is arranged above the primary sedimentation tank, the primary sedimentation tank is a tank body, an upper tank body and a lower sludge tank are arranged in the primary sedimentation tank, the upper tank body comprises an upper tank body bottom plate inclined to the lower sludge tank, a first water outlet for injecting sewage into the upper tank body is arranged at the lower end of the second water separator, a circle of sewage inlet tank is arranged at the position, close to the upper edge, of the upper tank body, a second water outlet for injecting water into the sewage inlet tank is arranged at the lower end of the second water separator, the sewage inlet tank is horizontally arranged near to an overflow weir arranged at one side in the upper tank body, the lower end of the overflow weir is provided with a sewage inlet side wall inclined to the tank wall of the upper tank body, the overflowed sewage in the overflow weir flows to the sewage inlet tank body along the outer wall of the overflow weir and the sewage inlet tank side wall, the sewage inlet tank is provided with a sewage inlet tank and a sewage inlet pipeline, the sewage inlet tank is further provided with a sewage inlet tank and a sludge sedimentation tank, and a sludge inlet pipeline is arranged in the sewage inlet tank is communicated with the sewage inlet tank.

2. The integrated skid-mounted wastewater treatment apparatus of claim 1, wherein said upper tank is a cylindrical tank and said wastewater inlet channel is an annular channel extending along the entire wall of said upper tank.

3. The integrated skid-mounted wastewater treatment device according to claim 1, wherein the wastewater inlet unit comprises a wastewater suction pump and a wastewater blocking coarse grid, the wastewater suction pump pumps wastewater to the second water separator, and the wastewater suction pump is arranged at the rear end of the wastewater blocking coarse grid.

4. The integrated skid-mounted wastewater treatment device according to claim 1, wherein the biological treatment unit comprises an anaerobic tank, a first aerobic tank, a first anoxic tank, a second aerobic tank, a second anoxic tank and a third aerobic tank which are sequentially connected, the first water separator is connected with the anaerobic tank, the first anoxic tank and the second anoxic tank, phosphorus accumulating bacteria are put in the anaerobic tank, 70% of raw wastewater separated by the first water separator enters the anaerobic tank, effluent water of the anaerobic tank flows into the first aerobic tank, nitrifying bacteria are put in the first aerobic tank, oxidizing, nitrifying and taking phosphorus for the wastewater, 20% of raw wastewater separated by the first water separator enters the first anoxic tank, the first anoxic tank provides a nitrogen source and carries out denitration and phosphorus release, 10% of raw wastewater separated by the first water separator enters the second anoxic tank, and then carries out oxidation and nitration reactions, 10% of raw wastewater separated by the second water separator enters the second anoxic tank, and the first anoxic tank is supplied with the first anoxic tank and the total nitrogen source is completely reduced, and the total nitrogen is completely dissolved in the first anoxic tank.

5. The integrated skid-mounted wastewater treatment device according to claim 1, wherein the final sedimentation unit comprises a final sedimentation tank, the final sedimentation tank is a rectangular tank, a sludge scraper is arranged at the bottom of the final sedimentation tank, a scum scraper is arranged at the top of the final sedimentation tank, sludge in the final sedimentation tank is settled to the bottom of the tank by gravity, the bottom sludge is scraped by the sludge scraper and then is concentrated to a sludge storage tank, the sludge storage tank is connected with a biological treatment unit, and a backflow sludge pump is arranged on a connecting pipeline between the sludge storage tank and the biological treatment unit.

6. The integrated skid-mounted wastewater treatment device according to claim 1, further comprising a filtration and disinfection unit, wherein the filtration and disinfection unit comprises a filtration tank, a disinfection pipeline and a recovery water tank, an ultraviolet sterilizing lamp is arranged in the disinfection pipeline, and the effluent water of the final sedimentation unit flows into the filtration tank for filtration and then falls into the recovery water tank after being disinfected by the ultraviolet sterilizing lamp of the disinfection pipeline.

7. The integrated skid-mounted wastewater treatment apparatus of claim 1, wherein the pretreatment unit further comprises a sand washer, a sludge line for guiding sludge from the lower sludge tank to the sand washer is disposed between the sand washer and the lower sludge tank, and the sludge line comprises an n-shaped section.

8. The integrated skid-mounted wastewater treatment device according to claim 1, wherein the sludge concentration unit comprises a sludge concentration feed pump and a sludge concentration machine, the sludge concentration feed pump pumps the sludge in the sludge storage tank to the sludge concentration machine, the sludge concentration machine is provided with a high polymer flocculating agent for adding and mixing, concentration is carried out to increase the concentration of the sludge, and a concentrated filtrate of the sludge concentration machine is pumped back to the pretreatment unit for reprocessing.

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