CN115140891B

CN115140891B - Movable sewage treatment device

Info

Publication number: CN115140891B
Application number: CN202210738212.4A
Authority: CN
Inventors: 孙伟杰; 张梅
Original assignee: Zhejiang Jinglijie Environmental Technology Co ltd
Current assignee: Zhejiang Jinglijie Intelligent Technology Co ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2023-06-06
Anticipated expiration: 2042-06-28
Also published as: CN115140891A

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

Movable sewage treatment device

Technical Field

The invention belongs to the technical field of sewage treatment equipment, and particularly relates to a movable sewage treatment device.

Background

The sewage source can be divided into living sewage and industrial sewage, and if the sewage is directly discharged to a water body without treatment, water pollution can be generated when the sewage exceeds the load of the water body, so that how to treat the sewage is an important subject for preventing and treating the water pollution. Domestic sewage contains a large amount of organic substances, is unstable and perishable, causes malodor, and may contain various pathogenic bacteria. Most of the organic matters in the domestic sewage are substances which are easy to decompose and have no biological toxicity, so that the treatment of the urban domestic sewage is promoted to treat the domestic sewage by adopting a biological treatment program so as to remove the organic matters and nutrient substances in the urban domestic sewage, and the aim of purifying the water quality is fulfilled.

In the prior art, the sewage treatment is commonly performed by an A2O method, and the A2O method can be used for secondary sewage treatment or tertiary sewage treatment and reclaimed water recycling, and has good denitrification and dephosphorization effects. A2O treatment procedure is to control the difference of bacterial functions in the Anaerobic (Anaerobic), anoxic (Anoxic) and aerobic (Oxic) tank environments to remove, and the nitrogen removal procedure is to perform denitration in the Anoxic section to perform nitrification in the aerobic section, and the phosphorus removal mechanism is to release phosphorus in the Anaerobic section and take phosphorus in excess in the aerobic section, so that the phosphorus sludge absorbed and stored by microorganisms is discharged out of the system to achieve the phosphorus removal effect. In the conventional A2O process, two processes of denitrification and dephosphorization are completed efficiently, and various contradictions and conflicts, such as contradiction of sludge age, carbon source competition, residual interference of nitrate and Dissolved Oxygen (DO), and the like, occur.

Disclosure of Invention

The invention aims to solve the technical problems and provides a movable sewage treatment device.

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

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, sludge in the final sedimentation tank is concentrated to a sludge storage tank, an overflow port is arranged at the top of the final sedimentation tank, and the sludge storage tank is connected to the anaerobic tank so as to reflux part of sludge to the anaerobic tank.

As a preferred technical scheme the top of elementary sedimentation tank is equipped with the second water knockout drum, elementary sedimentation tank is a jar body, be equipped with upper portion cell body and lower part sludge tank in the elementary sedimentation tank, the upper portion cell body include to the upper portion cell body bottom plate of lower part sludge tank slope, the lower extreme of second water knockout drum be equipped with to the upper portion cell body pours into the first delivery port of sewage into the upper portion cell body and is close to top edge department and be equipped with round sewage intake groove, the lower extreme of second water knockout drum be 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 sewage intake groove is in the lower extreme of overflow weir is equipped with to the sewage intake groove lateral wall of upper portion sludge tank slope, the overflow weir makes the sewage that overflows in the sewage intake groove flow along the outer wall of overflow weir and the sewage intake groove lateral wall of upper portion cell body flow to the sewage intake groove lateral wall, be equipped with in the sewage intake groove is equipped with the sewage flow channel and is equipped with the sewage drain down the sludge channel, the sludge channel is equipped with the sludge drain down the sludge channel.

As a preferable technical scheme, the pretreatment unit further comprises a sand washer, a sludge pipeline for guiding the sludge in the lower sludge tank to the sand washer is arranged between the sand washer and the lower sludge tank, and the sludge pipeline comprises an n-shaped section.

As a preferred technical scheme, the front end of the primary sedimentation tank is at least provided with a sewage suction pump for pumping sewage to the primary sedimentation tank and a screen for blocking coarse suspended matters.

As a preferable technical scheme, the screen comprises a sewage blocking coarse grid and a sewage blocking fine grid, wherein the sewage blocking coarse grid is arranged at the front end of the sewage suction pump, and the sewage blocking fine grid is arranged between the sewage suction pump and the primary grit chamber.

As a preferable technical scheme, the mobile sewage treatment device further comprises a sludge concentration unit, wherein the sludge concentration unit is used for concentrating waste sludge in the sludge storage tank, the sludge concentration unit comprises a sludge concentration feeding pump and a sludge concentration machine, the sludge concentration feeding 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, and after the high polymer flocculating agent is added and mixed, 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 retreatment.

As a preferable technical scheme, the mobile sewage treatment device further comprises a sludge dewatering unit, the sludge concentrated by the sludge thickener is pumped to the sludge dewatering unit, the sludge dewatering unit comprises a centrifugal sludge dewatering machine and a sludge storage bucket, dewatered sludge cakes are stored in the sludge storage bucket, and a dewatering filtrate of the sludge dewatering unit flows back to the pretreatment unit.

As a preferable technical scheme, the upper tank body is a cylindrical tank body, and the sewage inlet tank is an annular groove body extending along the whole wall surface of the upper tank body.

After the technical scheme is adopted, the invention has the following advantages:

1. the biological treatment unit is formed by connecting an anaerobic tank, a first aerobic tank, a first anoxic tank, a second aerobic tank, a second anoxic tank and a third aerobic tank in series, and can improve the total nitrogen removal efficiency without reducing the total phosphorus removal effect by combining a step inflow with an activated sludge procedure under the condition of no backflow of aerobic nitrifying liquid.

2. When the primary sedimentation tank is in a low liquid level state, the primary sedimentation tank of the invention utilizes the scouring action to treat the side wall and the bottom plate of the upper tank body so as to scour the sludge into the lower sludge tank.

Drawings

FIG. 1 is a schematic diagram of a mobile sewage treatment apparatus;

FIG. 2 is a top view of a mobile sewage treatment plant;

FIG. 3 is a schematic diagram of the structure of a primary sedimentation tank;

FIG. 4 is a schematic cross-sectional view of a primary sedimentation tank;

FIG. 5 is a schematic diagram of the structure of a biological processing unit;

in the figure:

1-a box body; 2-a sewage water inlet unit; 201-a dirt blocking coarse grid; 3-a pretreatment unit; 301-a primary grit chamber; 3011-upper cell body; 30111-upper cell body floor; 3012-a lower sludge tank; 3013-a sewage inlet tank; 30131-side walls of sewage inlet tanks; 30132-a sludge settling tank; 30133-sewage inlet tank bottom plate; 3014-overflow weir; 302-a dirt blocking fine grid; a 4-biological treatment unit; 401-anaerobic tank; 402-a first aerobic tank; 403-a first anoxic tank; 404-a second aerobic tank; 405-a second anoxic tank; 406-a third aerobic tank; 5-final sedimentation unit; 6-a filtration and disinfection unit; 7-a second water separator; 701-a first water outlet; 702-a second water outlet; 8-a sludge pipeline; 9-a first water separator.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1, a mobile sewage treatment apparatus includes a tank 1 placed on a flatbed wagon to realize movement of the sewage treatment apparatus.

As shown in fig. 2, the mobile sewage treatment apparatus further includes a sewage inflow unit 2, a pretreatment unit 3, a biological treatment unit 4, a final sedimentation unit 5, a filtration and sterilization unit 6, a sludge concentration unit (not shown), and a sludge dehydration unit (not shown). The sewage sequentially passes through a sewage inlet unit 2, a pretreatment unit 3, a biological treatment unit 4, a final sedimentation unit 5 and a filtration and disinfection unit 6. And after the waste sludge from the final sedimentation unit 5 is deposited, concentrating the waste sludge by a sludge concentrating unit, and dehydrating the concentrated sludge by a sludge dehydrating unit. The sludge concentration unit and the sludge dewatering unit are arranged below the filtering and sterilizing unit 6.

The pretreatment unit 3, the biological treatment unit 4, the final sedimentation unit 5, the sludge concentration unit and the sludge dewatering unit are arranged in the box body. Since the tank 1 is loaded on the flatbed wagon, i.e., the tank 1 has a smaller space than the conventional sewage treatment apparatus, the sewage treatment apparatus is required to occupy less space while providing better bio-oxygen supply and uniform flow of downstream processes.

The sewage inflow unit 2 includes a sewage suction pump. The sewage inflow unit may be provided in the tank 1, but the sewage inflow unit 2 generally serves as an attachment mechanism to connect the sewage inlet of the pretreatment unit 3 due to the space restriction of the tank 1.

In this embodiment, the sewage to be treated contains a large amount of garbage or large-particle impurities, and the sewage inlet unit is additionally provided with a sewage blocking coarse grid 201 for pretreatment of inlet water. The dirt blocking coarse grating 201 of the embodiment is arranged in the case 1. The sewage blocking coarse grating 201 is a special water treatment device capable of continuously and automatically blocking and removing sundries with various shapes in fluid, and is a group of rotary grating chains assembled by a unique rake teeth factory. The rake teeth chains are driven by the motor reducer to perform rotary motion in the reverse water flow direction. When the rake teeth chain runs to the upper part of the equipment, the relative self-cleaning motion is generated between each group of rake teeth due to the guiding of the grooved wheels and the bent rails, and most of solid matters fall down by gravity. And the other part cleans sundries stuck on the rake teeth by means of the reverse movement of the sweeper. The rake teeth chains are similar to the grids according to the water flow direction, and the rake teeth gaps assembled on the rake teeth chain shafts can be selected according to the use conditions. When the rake teeth separate solid suspended matters in the fluid, the smooth flow of water can be ensured. The whole working process is continuous or intermittent. The sewage blocking coarse grid 201 is arranged in front of the sewage pump to screen coarse matters in water and protect the sewage pump.

In another embodiment, the dirt blocking coarse grid 201 is replaced with a screen.

The pretreatment unit 3 includes a primary grit chamber 301. The most common grit removal method of the primary grit chamber 301 is a gravity method in which grit is deposited by reducing the inflow speed, or a centrifugal method in which grit is deposited in a sump by using an annular passage/groove or a centrifugal impeller, and the grit is separated so that organic matters can move forward into a biological treatment unit.

The pretreatment unit 3 further includes a sand washer (not shown) disposed below the primary grit chamber 301. The sand washer is connected with the bottom of the primary sand setting tank 301, the sand washer pumps the mortar separated from the primary sand setting tank 301 into the sand washer, and the sand washer is collected in the garbage truck for removal after sand washing. The connecting pipeline between the sand washer and the bottom of the primary sand setting tank 301 is n-shaped, so that the solids separated from the primary sand setting tank 301 can be effectively sucked out, and less sewage is sucked in. The sand washing filtrate of the sand washer flows back to the water inlet of the pretreatment unit 3.

In this embodiment, the pretreatment unit 3 further includes a trash rack 302 provided in front of the primary grit chamber 301. The dirt blocking fine grid 302 has the function similar to the dirt blocking coarse grid 201, is used for blocking suspended impurities in sewage, but has different thickness, the distance between the grid bars of the dirt blocking coarse grid 201 is 10-20mm, and the dirt blocking fine grid 302 is 5-10 mm. A squeezer (not shown) is arranged below the dirt blocking fine grid 302, and the screened objects of the dirt blocking fine grid 302 are squeezed by the squeezer and then are collected in a garbage sub-truck for removal. The water from the squeezer flows back 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 may be unevenly deposited on the wall and bottom of the primary grit chamber 301. Thus, in one embodiment, the primary grit chamber 301 having the following structure is used for flushing solids of the wall and bottom of the primary grit chamber 301 toward the sludge tank at the bottom of the primary grit chamber 301:

as shown in fig. 3 and 4, the primary sedimentation tank 301 is a tank, an upper tank 3011 and a lower sludge tank 3012 are disposed in the primary sedimentation tank, and the upper tank 3011 includes an upper tank bottom plate 30111 inclined toward the lower sludge tank 3012.

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 tank body, the upper tank body 3011 is provided with a circle of sewage water inlet groove 3013 near the upper edge, and the lower end of the second water separator 7 is provided with a second water outlet 702 for injecting water into the sewage water inlet groove 3013. The two second water outlets 702 are arranged, and the two second water outlets 702 are respectively connected to two water filling ports oppositely arranged on the outer wall of the primary sedimentation tank 301 through water filling pipelines. The sewage injected from the water injection port flows into the sewage water inlet tank 3013.

The sewage inflow tank 3013 is horizontally arranged, and an overflow weir 3014 is arranged on one side of the sewage inflow tank 3013, which is close to the inner part of the upper tank 3011. The sewage inflow groove 3013 is provided with a sewage inflow groove side wall 30131 inclined to the tank wall of the upper tank 3011 at the lower end of the overflow weir 3014, and the overflow weir 3014 causes sewage overflowed in the sewage inflow groove 3013 to flow to the side wall of the upper tank 301 along the outer wall of the overflow weir 3014 and the sewage inflow groove side wall 30131.

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

The sewage inflow tank 3013 is internally provided with a sludge settling tank 30132, the sewage inflow tank 3013 further comprises a sewage inflow tank bottom plate 30133 for guiding sludge to the sludge settling tank 30132, the sludge settling tank 30132 is communicated with the lower sludge tank 3012 through a sludge pipeline 8, and a discharge valve is arranged on the sludge pipeline 8. The two sludge settling tanks 30132 are provided, the two sludge settling tanks 30132 are provided at opposite ends of the sewage inflow tank 3013, the sewage inflow tank bottom plate 30133 is sloped, and the sewage inflow tank bottom plate 30133 is provided between the two sludge settling tanks 30132.

During normal operation of the primary settling tank 301, it may be desirable that the liquid level within the primary settling tank 301 rise above the top of the sewage intake tank 3013.

When the primary settling tank 301 is in a low liquid level state, the primary settling tank 301 treats the side walls and bottom plate of the upper tank 3011 with a flushing action to flush sludge into the lower sludge tank 3012. The second water separator 7 is controlled to discharge sewage into the sewage inflow tank 3013, and the second water separator 7 has the ability to adjust the inflow flow rate of the sewage inflow tank 3013 so that the primary sedimentation tank 301 has a necessary flushing level. The sewage flowing out of the first water outlet 701 and the second water outlet 702 flows into the upper tank 3011 and the sewage water inlet tank 3013 by gravity, respectively. The sewage inflow tank 3013 extends horizontally to the entire wall surface of the upper tank 3011, and provides flushing for the side walls and bottom plate of the entire upper tank 3011. The sewage flowing down by the flushing is a conical downward impact, and a collision is generated at the lower sludge tank 3012, and the collision causes turbulence, thereby reducing the water flow speed.

Sewage flows into the sewage inflow tank 3013 and rises until it overflows the entire length of the overflow weir 3014, and enters the upper tank 301 in a thin layer. Effluent flows along the outer surface of overflow weir 3014 to the sloped side walls of effluent channel 3013, along effluent channel side walls 30131 to the upper cell body 3011 side walls, along the upper cell body 3011 side walls to upper cell body floor 30111, and to lower sludge channel 3012.

The sewage inflow tank 3013 has a valved sludge settling tank 30132, which is directly connected to the lower sludge tank 3012 by a sludge line 8. In addition, the sewage inlet tank bottom plate 30133 is inclined downward toward the sludge settling tank 30132 to facilitate the discharge of sludge in the sewage inlet tank 3013.

As shown in fig. 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 raw sewage in the primary grit chamber 301 into three parts in the following ratio: 70%, 20% and 10%.

The biological treatment unit 4 comprises 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 which are connected in sequence.

The anaerobic tank 401, the first anoxic tank 403 and the second anoxic tank 405 are all closed reaction tanks, and complex organic matters in the wastewater are decomposed into stable matters by anaerobic microorganisms. The organic matters can be used as foods of microorganisms such as carbohydrates, proteins, fats and the like, and are decomposed into simple and stable substances such as methane, carbon dioxide and the like through anaerobic reaction.

The reaction in the first aerobic tank 402, the second aerobic tank 404 and the third aerobic tank 406 is that organic matters containing carbon, nitrogen and sulfur are synthesized with oxygen to form byproducts such as microorganism cells, carbon dioxide, water and sulfate ions under the action of aerobic bacteria.

The final sedimentation unit 5 is connected with the anaerobic tank 401, and a part of the sludge deposited by the final sedimentation unit 5 flows back to the anaerobic tank 401. The primary grit chamber 301 is connected with the anaerobic tank 401, and 70% of raw sewage separated by the first water separator 9 in the primary grit chamber 301 enters the anaerobic tank 401. The anaerobic tank 401 is put with phosphorus accumulating bacteria, and the phosphorus accumulating bacteria are utilized to release phosphorus under anaerobic conditions, and simultaneously absorb a large amount of carbon sources to enter the first aerobic tank 402 for performing a nitrification phosphorus uptake procedure.

The effluent of the anaerobic tank 401 flows into a first aerobic tank 402, nitrifying bacteria are put in the first aerobic tank 402, and sewage is oxidized, nitrified and phosphorus-absorbed.

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

The effluent from the first anoxic tank 403 enters the second aerobic tank 404, and oxidation and nitration reactions are performed again. The second aerobic tank 404 nitrifies ammonia nitrogen in the residual 20% of the raw sewage.

The primary sand setting tank 301 is connected with the second anoxic tank 405, and 10% of raw sewage separated by the first water separator 9 in the primary sand setting tank 301 enters the second anoxic tank 405. The effluent from the second aerobic tank 404 enters the second anoxic tank 405, and is supplied to a carbon source for denitrification in the second anoxic tank 405 and reduces total nitrogen.

The effluent from the second anoxic tank 405 enters the third anoxic tank 406, lifting the dissolved oxygen and making the nitrification reaction more complete. Third aerobic tank 406 oxidizes the remaining carbon source.

Because the digestion liquid is not required to be subjected to reflux denitration, the energy can be saved, and at the same time, only 10% of ammonia nitrogen is not subjected to denitration after being nitrified, and the denitrification rate is as high as 90% under the condition that the amount of reflux sludge is not calculated.

The biological treatment unit 4 is formed by connecting 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 in series, and can improve the total nitrogen removal efficiency without reducing the total phosphorus removal effect by combining a step inflow with an activated sludge process under the condition of no backflow of aerobic nitrifying liquid.

In this embodiment, the final sedimentation units 5 are provided with two groups. The final sedimentation unit 5 comprises a final sedimentation tank and a V-shaped overflow port arranged at the top of the final sedimentation tank. The bottom of the final sedimentation tank is provided with a mud scraper, and the top of the final sedimentation tank is provided with a scum scraper. The sludge in the final sedimentation tank is settled to the bottom of the tank by gravity, and the sludge at the bottom is scraped by a sludge scraper and then concentrated to a sludge storage tank. The sludge storage tank is connected with the anaerobic tank, and a reflux sludge pump is arranged on a connecting pipeline between the sludge storage tank and the anaerobic tank 401.

The sludge concentration unit comprises a sludge concentration feed pump and a sludge concentration machine, wherein the sludge concentration feed pump is a single-shaft spiral feed pump in the embodiment. The sludge concentration feeding pump pumps the sludge in the sludge storage tank to the sludge thickener, and the sludge thickener is provided with the polymer flocculant to be added and mixed, and then the mixture is concentrated to increase the concentration of the sludge. The sludge concentrated by the sludge thickener is pumped to a sludge dewatering unit. The concentrated filtrate of the sludge thickener is pumped back to the pretreatment unit for reprocessing.

The sludge dewatering unit comprises a centrifugal sludge dewatering machine and a sludge storage bucket. The dewatered cake is stored in a sludge storage hopper, and the dewatered filtrate of the sludge dewatering unit flows back to the water inlet of the primary grit chamber 301.

The filtration and disinfection unit 6 is connected with the final sedimentation unit 5. In this embodiment, the filter sterilization unit 6 is provided with two groups. The filtration and disinfection unit 6 comprises a filtration tank, a disinfection pipeline and a recovery water tank. The effluent water of the final sedimentation unit 5 flows into the filter tank for filtration, and then falls into the recovery water tank after being disinfected by the ultraviolet sterilizing lamp of the disinfection pipeline. It should be noted that if the water quality before filtration meets the emission standard, the filtration step may be omitted.

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

the front part of the box body 1 is an arrangement area of a biological treatment unit 4, and the rear part of the box body 1 is an arrangement area of a sewage water inlet unit 2, a pretreatment unit 3, a final sedimentation unit 5, a filtration and disinfection unit 6, a sludge concentration unit and a sludge dewatering unit. Wherein, the sewage blocking coarse grid 201 of the sewage inlet unit 2 is arranged at the extreme end of the box body 1 and is connected with the sewage inlet.

The 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 of the biological treatment unit 4 are arranged in a U-shaped route at the front part of the tank body 1.

The pretreatment unit 3 is disposed between the anaerobic tank 401 and the sewage blocking coarse grid 201.

The final sedimentation tank is arranged beside the pretreatment unit 3 and is close to the anaerobic tank 401, so that a return sludge pipeline is shortened. The filtering and sterilizing unit 6 is disposed at the rear side of the final sedimentation tank at the extreme end of the tank 1, and sterilizing pipes therein are disposed in the lateral direction of the tank 1. The drain port of the filtering and sterilizing unit 6 is provided at the extreme end of the case 1.

In addition to the above preferred embodiments, the present invention has other embodiments, and various changes and modifications may be made by those skilled in the art without departing from the spirit of the invention, which is defined in the appended claims.

Claims

1. A mobile sewage treatment device, comprising:

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.