CN115140891B - A mobile sewage treatment device - Google Patents

Abstract

The invention provides a mobile sewage treatment device, comprising: the pretreatment unit at least comprises a primary sedimentation tank, and a first water separator is arranged at the water outlet end of the primary sedimentation tank; 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, 70% of raw sewage separated by the first water separator enters the anaerobic tank, the outflow water of the first aerobic tank and 20% of raw sewage separated by the first water separator enter the first anoxic tank, and the outflow water of the second aerobic tank and 10% of raw sewage separated by the first water separator enter the second anoxic tank; the final sedimentation unit comprises a final sedimentation tank, and part of sludge in the final sedimentation tank flows back to the anaerobic tank. The invention can improve the total nitrogen removal efficiency without reducing the total phosphorus removal effect.

Description

A mobile sewage treatment device

technical field

The invention belongs to the technical field of sewage treatment equipment, in particular to a mobile sewage treatment device.

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.

In the prior art, the A2O method is commonly used for sewage treatment, and the A2O method can be used for secondary sewage treatment or tertiary sewage treatment, as well as reuse of reclaimed water, and has good nitrogen and phosphorus removal effects. The A2O treatment program is to control the difference in the function of the bacteria in the anaerobic (Anaerobic), anoxic (Anoxic) and aerobic (Oxic) tank environments. Nitrification is carried out in the stage, and the phosphorus removal mechanism is to release phosphorus in the anaerobic stage, and then overtake phosphorus in the aerobic stage, and discharge the phosphorus sludge absorbed and stored by microorganisms out of the system to achieve phosphorus removal. When the two processes of denitrification and phosphorus removal are efficiently completed in the single sludge system of the traditional A2O process, various contradictions and conflicts will occur, such as the contradiction of sludge age, carbon source competition, nitrate and dissolved oxygen (DO) residual interference, etc. .

Contents of the invention

The present invention aims to solve the above technical problems and provides a mobile sewage treatment device.

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

A mobile sewage treatment device, comprising:

A box body, which is used to be placed on a flatbed truck to realize the movement of the sewage treatment device;

A pre-processing unit, the pre-processing unit is arranged in the box, the pre-processing unit at least includes a primary sedimentation tank, and a first water separator is provided at the water outlet of the primary sedimentation tank;

A biological treatment unit, the biological treatment unit is arranged in the box, and the biological treatment unit includes an anaerobic tank connected in sequence, a first aerobic tank, a first anoxic tank, a second aerobic tank, a second anoxic tank The aerobic pool and the third aerobic pool, the first water separator is connected with the anaerobic pool, the first anoxic pool, and the second anoxic pool, and phosphorus accumulating bacteria are placed in the anaerobic pool, and the first water separator separates 70% of the raw sewage enters the anaerobic pool, and the effluent water from the anaerobic pool flows into the first aerobic pool. The water and 20% of the raw sewage from the first water separator enter the first anoxic tank, the first anoxic tank provides nitrogen source and performs denitrification and phosphorus release, and the effluent water from the first anoxic tank enters the second aerobic tank , carry out the oxidation and nitrification reaction 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 , the effluent water from the second anoxic tank enters the third aerobic tank to increase the dissolved oxygen and make the nitrification reaction more complete;

A final sedimentation unit, the final sedimentation unit is arranged in the box, the final sedimentation unit at least includes a final sedimentation tank, the sludge in the final sedimentation tank is concentrated into a sludge storage tank, and the final sedimentation tank An overflow port is provided on the top of the sedimentation tank, and the sludge storage tank is connected to the anaerobic tank to return part of the sludge to the anaerobic tank.

As a preferred technical solution, a second water separator is provided above the primary sedimentation tank, the primary sedimentation tank is a tank body, and an upper tank body and a lower sludge tank are arranged in the primary sedimentation tank, The upper tank body includes an upper tank body bottom plate inclined to the lower sludge tank, and the lower end of the second water separator is provided with a first water outlet for injecting sewage into the upper tank body, and the upper tank body is The 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 is in An overflow weir is provided on the inner side of the upper pool body, and the sewage inlet tank is provided with a side wall of the sewage inlet tank inclined to the pool wall of the upper pool body at the lower end of the overflow weir. The flow weir makes the sewage overflowing in the sewage inlet tank 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 a sludge settlement tank is arranged in the sewage inlet 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 pipe There is a discharge valve on the road.

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 front end of the primary sedimentation tank is at least provided with a sewage pump for pumping sewage to the primary sedimentation tank and a screen for blocking coarse suspended matter.

As a preferred technical solution, the sieve includes a coarse trash grid and a fine trash grid, the coarse trash grid is arranged at the front end of the sewage pump, and the fine trash grid is arranged at the front end of the sewage pump and the primary grit chamber.

As a preferred technical solution, the mobile sewage treatment device also includes a sludge thickening unit, the sludge thickening unit is used to thicken the discarded sludge in the sludge storage tank, and the sludge thickening unit includes a sludge Concentrated feed pump and sludge thickener, the sludge thickened feed pump pumps the sludge in the sludge storage tank to the sludge thickener, and the sludge thickener provides polymer flocculants to add and mix, then concentrate to make the sludge The sludge concentration increases, and the concentrated filtrate from the sludge thickener is pumped back to the pre-treatment unit for reprocessing.

As a preferred technical solution, the mobile sewage treatment device also includes a sludge dewatering unit, and the sludge concentrated by the sludge thickener is pumped to the sludge dewatering unit, and the sludge dewatering unit includes a centrifugal sludge dewatering machine and a sludge dewatering unit. The sludge storage hopper, the dehydrated cake is stored in the sludge storage hopper, and the dehydrated filtrate from the sludge dehydration unit is returned to the pre-treatment unit.

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.

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

1. The biological treatment unit of the present invention is composed of an anaerobic tank, the first aerobic tank, the first anoxic tank, the second aerobic tank, the second anoxic tank and the third aerobic tank in series, and aerobic nitrification without reflux In the case of 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.

2. When the primary settling tank is in a state of low liquid level, the primary settling tank of the present invention treats the side wall and bottom plate of the upper tank body by scouring to wash the sludge into the lower sludge tank.

Description of drawings

Fig. 1 is a structural schematic diagram of a mobile sewage treatment device;

Fig. 2 is a top view structural diagram of a mobile sewage treatment device;

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-Box; 2-Sewage Inlet Unit; 201-Trash Rack; 3-Pretreatment Unit; 301-Primary Grit Chamber; 3011-Upper Tank; 30111-Upper Tank Bottom; Tank; 3013-Sewage Inlet Tank; 30131-Sewage Inlet Tank Side Wall; 30132-Sludge Settling Tank; 30133-Sewage Inlet Tank Floor; 3014-Overflow Weir; -anaerobic tank; 402-the first aerobic tank; 403-the first anoxic tank; 404-the second aerobic tank; 405-the second anoxic tank; 406-the third aerobic tank; ; 6-filter disinfection unit; 7-second water separator; 701-first water outlet; 702-second water outlet; 8-sludge pipeline; 9-first water separator.

Detailed ways

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

As shown in FIG. 1 , a mobile sewage treatment device includes a box body 1 , and the box body is placed on a flatbed truck to realize the movement of the sewage treatment device.

As shown in Figure 2, the mobile sewage treatment device also includes a sewage water inlet unit 2, a pretreatment unit 3, a biological treatment unit 4, a final sedimentation unit 5, a filter disinfection unit 6, a sludge concentration unit (not shown) and a sewage treatment unit. Mud dewatering 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 pre-treatment unit 3, the biological treatment unit 4, the final sedimentation unit 5, the sludge thickening unit and the sludge dehydration unit are arranged in the box. Since the tank 1 is loaded on a flatbed truck, that is, the tank 1 has a smaller space than the traditional sewage treatment device, so the sewage treatment device needs to occupy less space, while providing better biological oxygen supply and uniformity of the downstream process flow.

The sewage water inlet unit 2 includes a sewage pump. The sewage water inlet unit can be arranged in the tank body 1, but due to the limitation of the space of the tank body 1, the sewage water inlet unit 2 is generally used as an auxiliary mechanism to connect the sewage inlet of the pre-treatment unit 3.

In this embodiment, the sewage to be treated contains a large amount of garbage or large particles of debris, and the sewage water inlet unit is additionally equipped with a rough trash bar 201 for pre-treatment of water inflow. The trash-stopping rough grid 201 of this embodiment is arranged inside the box body 1 . 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 rough 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-processing unit 3 also includes a sand washing machine (not shown) arranged below the primary grit chamber 301 . The sand washer is connected to the bottom of the primary grit chamber 301, and the sand washer pumps the mortar separated from the primary grit chamber 301 into the sand washer, and after the sand is washed, it is concentrated in the garbage sub-car for removal. 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, in one embodiment, the primary grit chamber 301 with the following structure is used to flush the solids on the wall and bottom of the primary grit chamber 301 to the sludge tank at the bottom of the 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. It should be noted that if the water quality before filtration meets the discharge standard, the filtration step can be omitted.

In order to realize the reasonable layout of the space in the box body 1, the present invention also limits the positions of the units in the box body 1:

The front part of the box body 1 is the layout area of the biological treatment unit 4, and the rear part of the box body 1 is the sewage water inlet unit 2, the pre-treatment unit 3, the final sink unit 5, the filter disinfection unit 6, the sludge concentration unit and the sludge The layout area of the dehydration unit. Wherein, the rough trash grid 201 of the sewage water inlet unit 2 is arranged at the end of the box body 1 and connected with the sewage inlet.

The anaerobic pond 401, the first aerobic pond 402, the first anoxic pond 403, the second aerobic pond 404, the second anoxic pond 405 and the third aerobic pond 406 of the biological treatment unit 4 are in front of the box 1 The parts are arranged in a U-shaped route.

The pre-treatment unit 3 is arranged between the anaerobic tank 401 and the rough grid 201 for the trash control.

The final settling tank is set next to the pretreatment unit 3, close to the anaerobic tank 401, and the return sludge pipeline is shortened. The filter disinfection unit 6 is arranged on the rear side of the final sedimentation tank, at the end of the box body 1 , and the disinfection pipes therein are arranged along the transverse direction of the box body 1 . The drain outlet of the filter disinfection unit 6 is arranged at the extreme end of the box body 1 .

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 (7)

1. A mobile sewage treatment device, comprising:

the box body is used for being placed on a flat wagon so as to realize the movement of the sewage treatment device;

the pretreatment unit is arranged in the box body and at least comprises a primary sedimentation tank, and a first water separator is arranged at the water outlet end of the primary sedimentation tank;

the biological treatment unit is arranged in the box body and comprises an anaerobic tank, a first aerobic tank, a first anoxic tank, a second aerobic tank, a second anoxic tank and a third anoxic 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 sewage 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, oxidation, nitrification and phosphorus uptake are carried out on the sewage, the effluent water of the first aerobic tank and 20% of raw sewage separated by the first water separator enter the first anoxic tank, the first anoxic tank provides a nitrogen source and carries out denitrification and phosphorus release, the effluent water of the first anoxic tank enters the second aerobic tank, oxidation and nitrification reactions are carried out again, the effluent water of the second aerobic tank and 10% of raw sewage separated by the first water separator enter the second anoxic tank, the total nitrogen source is reduced and the total nitrogen source is fully dissolved in the second anoxic tank, and the total nitrogen source is fully dissolved in the second anoxic tank;

the final sedimentation unit is arranged in the box body and at least comprises a final sedimentation tank, the sludge in the final sedimentation tank is concentrated to a sludge storage tank, the top of the final sedimentation tank is provided with an overflow port, and the sludge storage tank is connected to the anaerobic tank to reflux part of the sludge to the anaerobic tank;

the utility model provides a sewage sedimentation tank, including the sewage sedimentation tank, the sewage sedimentation tank is equipped with the primary sedimentation tank, the primary sedimentation tank is equipped with the upper portion cell body and lower part mud groove in, the upper portion cell body include to the upper portion cell body bottom plate of lower part mud groove slope, the lower extreme of second water knockout drum is equipped with to the upper portion cell body pours into the first delivery port of sewage into the basin lateral wall of upper portion cell body into the upper portion cell body is close to upper edge department and is equipped with round sewage intake groove, the lower extreme of second water knockout drum is equipped with to the second delivery port of sewage intake groove water injection, the sewage intake groove level sets up, the sewage intake groove is being close to upper portion cell body inside one side is equipped with the overflow weir, the lower extreme of overflow weir is equipped with to the sewage intake groove lateral wall of upper portion cell body slope, the overflow weir makes the sewage that overflows in the sewage intake groove along the outer wall of overflow and the sewage intake groove lateral wall flow to the basin lateral wall of upper portion cell body, be equipped with the sewage intake groove in the sewage intake groove, the sewage intake groove is equipped with mud pipeline, the mud sedimentation tank is equipped with the mud sedimentation tank and mud pipeline down through the mud drain down side of the mud groove.

2. The mobile sewage 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 being disposed between the sand washer and the lower sludge tank, the sludge line comprising an n-shaped section.

3. A mobile sewage treatment plant according to any one of claims 1-2, characterized in that the front end of the primary sedimentation tank is provided with at least a sewage suction pump for pumping sewage to the primary sedimentation tank and a screen for blocking coarse suspended matter.

4. A mobile waste water treatment device as claimed in claim 3, wherein the screen comprises a coarse waste water blocking grating and a fine waste water blocking grating, the coarse waste water blocking grating being arranged at the front end of the waste water pump, the fine waste water blocking grating being arranged between the waste water pump and the primary sedimentation tank.

5. The mobile sewage treatment apparatus of claim 1, further comprising a sludge concentrating unit for concentrating the waste sludge in the sludge storage tank, wherein the sludge concentrating unit comprises a sludge concentrating feed pump and a sludge concentrating machine, the sludge concentrating feed pump pumps the sludge in the sludge storage tank to the sludge concentrating machine, the sludge concentrating machine is provided with a polymer flocculant for adding and mixing, the concentration is increased, and the concentrated filtrate of the sludge concentrating machine is pumped back to the pretreatment unit for reprocessing.

6. The mobile sewage treatment apparatus of claim 5, further comprising a sludge dewatering unit, wherein the sludge concentrated by the sludge concentrator is pumped to the sludge dewatering unit, the sludge dewatering unit comprises a centrifugal sludge dewatering machine and a sludge storage hopper, the dewatered sludge cake is stored in the sludge storage hopper, and a dewatering filtrate of the sludge dewatering unit flows back to the pretreatment unit.

7. The mobile sewage treatment apparatus of claim 1 wherein said upper tank is a cylindrical tank and said sewage inlet channel is an annular channel extending along the entire wall of said upper tank.

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