CN223002829U - Wastewater treatment equipment - Google Patents

Abstract

The utility model provides wastewater treatment equipment for treating cold chain transport container washing wastewater. The wastewater treatment equipment comprises a box body, wherein an air floatation tank is arranged in the box body, a water outlet of the air floatation tank is sequentially connected with a middle water tank, a multi-stage purification and filtration device and a clean water tank through pipelines, a sewage draining outlet of the air floatation tank is sequentially connected with a sludge tank and a filter press through pipelines, the filter press discharges sewage out of the box body through a waste liquid collecting pipe, the air floatation tank, the middle water tank, the multi-stage purification and filtration device and the clean water tank are arranged along the length direction of the box body, the air floatation tank, the sludge tank and the filter press are arranged along the length direction of the box body, and the waste liquid collecting pipe is positioned on one side of the width direction of the box body. The wastewater treatment equipment is integrated in a box body, so that a compact and efficient wastewater treatment system is formed, the occupied area is saved, and the equipment is convenient to install, debug and maintain. The waste liquid collecting pipe is positioned at one side of the width direction of the box body, so that the centralized discharge and the subsequent treatment of the sludge are facilitated.

Description

Waste water treatment equipment

Technical Field

The utility model relates to the technical field of cold chain container cleaning wastewater treatment, in particular to wastewater treatment equipment.

Background

The main sources of the current cold chain transport container washing wastewater are SS, COD and animal and vegetable oil. The integration degree of the sewage treatment facilities of the existing port is not high, so that the occupied space is overlarge, and the normal transportation of the port is affected.

Accordingly, there is a need to provide a wastewater treatment plant to at least partially solve the above-mentioned problems.

Disclosure of utility model

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. The summary of the utility model is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In order to at least partially solve the problems, the utility model provides wastewater treatment equipment, which is used for cold chain transportation container washing wastewater and comprises a box body, wherein an air floatation tank is arranged in the box body, a water outlet of the air floatation tank is sequentially connected with a middle water tank, a multi-stage purification and filtration device and a clean water tank through pipelines, a sewage draining outlet of the air floatation tank is sequentially connected with a sludge tank and a filter press through pipelines, the filter press discharges the sewage out of the box body through a waste liquid collecting pipe,

The air floatation tank, the middle water tank, the multi-stage purifying and filtering device and the clean water tank are arranged along the length direction of the tank body;

The air floatation tank, the sludge tank and the filter press are arranged along the length direction of the box body;

the waste liquid collecting pipe is located at one side of the box body in the width direction.

According to the wastewater treatment equipment, the components such as the air floatation tank, the middle water tank, the multi-stage purifying and filtering device, the clean water tank, the sludge tank, the filter press and the like are integrated in the box body, so that a compact and efficient wastewater treatment system is formed, the occupied area is saved, and the installation, the debugging and the maintenance of the equipment are facilitated. The flowing path of the wastewater from the air floatation tank to the clean water tank is more direct and smooth, and the detour and stagnation of the wastewater in the treatment process are reduced, so that the treatment efficiency is improved. The waste liquid collecting pipe is positioned at one side of the width direction of the box body, so that the centralized discharge and the subsequent treatment of the sludge are facilitated.

Optionally, the air floatation tank, the sludge tank, the intermediate tank, the multi-stage purifying and filtering device, the clean water tank and the filter press are sequentially arranged along the length direction.

Optionally, the air floatation tank, the intermediate water tank, the multi-stage purifying and filtering device, the sludge tank, the clean water tank and the filter press are respectively connected with the waste liquid collecting pipe through pipelines;

The waste liquid collecting pipe is positioned at one side of the air floatation tank, the middle water tank, the multi-stage purifying and filtering device, the sludge tank, the clean water tank and the filter press along the width direction of the tank body.

Optionally, the clean water tank discharges clean water out of the tank body through a reuse water pipe which is positioned at the same side of the width direction of the tank body as the waste liquid collecting pipe, and/or

The air floatation tank is connected with the sludge tank through a first sludge pipe, the first sludge pipe and the waste liquid collecting pipe are positioned at the same side of the box body in the width direction, and/or

The sludge tank is connected with the filter press through a second sludge pipe, and the second sludge pipe and the waste liquid collecting pipe are positioned on the same side of the box body in the width direction.

Optionally, the box body is provided with an inlet, an external pipeline extends from the inlet into the box body, wherein,

The inlet is arranged close to the air floatation tank.

Optionally, the box is provided with a door body, and the door body is arranged close to the filter press.

Optionally, a dosing device is also included, wherein,

The chemical adding device is positioned at the other side of the width direction of the box body and/or

The dosing device comprises a PAC dosing device and a PAM dosing device.

Optionally, the device further comprises a tap water pipe, wherein the tap water pipe extends into the box body through an inlet, and the tap water pipe is communicated with the dosing device.

Optionally, a pump is arranged between the sludge tank and the filter press, and/or

And a pump is arranged between the intermediate water tank and the multi-stage purifying and filtering device.

Optionally, the multi-stage purification filtration device comprises a sand filter and a carbon filter, the carbon filter being located downstream of the sand filter.

Drawings

The following drawings of embodiments of the present utility model are included as part of the utility model. Embodiments of the present utility model and their description are shown in the drawings to explain the principles of the utility model. In the drawings of which there are shown,

FIG. 1 is a schematic view of a wastewater treatment facility of the present utility model.

Description of the reference numerals

10 Box body

11 Inlet port

12 Door body

20, Air floatation tank

21 Dissolved air tank

30 Middle pool

40 Multistage purifying and filtering device

41 Sand filter

42 Carbon Filter

43 Lifting pump

50 Clear water pond

51, Recycling water pump

60 Sludge pond

70:Press filter

71 Screw pump

80 Medicine adding device

81 PAC dosing tube

82:PAM dosing tube

83 Pharmaceutical pile

90 Electric control equipment

110 Tap water pipe

120 Waste water inlet pipe

130:Recycled water pipe

140 Waste liquid collecting pipe

151 First sludge pipe

152 Second sludge pipe

DL length direction

DW width direction

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art that embodiments of the utility model may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the embodiments of the utility model.

Herein, ordinal words such as "first" and "second" cited in the present utility model are merely identifiers and do not have any other meaning, such as a particular order or the like. Also, for example, the term "first component" does not itself connote the presence of "second component" and the term "second component" does not itself connote the presence of "first component".

In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used merely to indicate relative positional relationships between the relevant portions, and do not limit the absolute positions of the relevant portions.

Herein, "equal," "same," etc. are not strictly mathematical and/or geometric limitations, but also include deviations that may be appreciated by those skilled in the art and allowed by fabrication or use, etc.

Unless otherwise indicated, numerical ranges herein include not only the entire range within both of its endpoints, but also the several sub-ranges contained therein.

Exemplary embodiments according to the present utility model will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be appreciated that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art.

Referring to fig. 1, the present utility model provides a wastewater treatment apparatus for cold chain transportation of container washing wastewater.

The wastewater treatment apparatus includes a tank 10. An air floatation tank 20 is arranged in the box body 10. The water outlet of the air floatation tank 20 is sequentially connected with the middle water tank 30, the multi-stage purifying and filtering device 40 and the clean water tank 50 through pipelines, the sewage draining outlet of the air floatation tank 20 is sequentially connected with the sludge tank 60 and the filter press 70 through pipelines, and the filter press 70 discharges sewage out of the tank body 10 through the waste liquid collecting pipe 140. The wastewater treatment equipment integrates components such as the air floatation tank 20, the middle water tank 30, the multi-stage purifying and filtering device 40, the clean water tank 50, the sludge tank 60, the filter press 70 and the like in the box body 10, so that a compact and efficient wastewater treatment system is formed, the occupied area is saved, and the equipment is convenient to install, debug and maintain.

In the utility model, the positions of the devices in the box body 10 are optimally arranged, the space of the box body 10 is fully utilized, the whole structure of the device is compact, and the occupied area is small. The processing units are relatively independent and closely connected, so that the modularized production and the field assembly of the equipment are facilitated, and the later maintenance of the equipment is also facilitated. Specifically, the floatation tank 20, the intermediate water tank 30, the multi-stage purification filter 40 and the clean water tank 50 are arranged along the length direction DL of the tank 10, and the floatation tank 20, the sludge tank 60 and the filter press 70 are arranged along the length direction DL of the tank 10. The flow path of the wastewater from the floatation tank 20 to the clean water tank 50 is more direct and smooth, and the detouring and stagnation of the wastewater in the treatment process is reduced, thereby improving the treatment efficiency. The waste liquid collecting pipe 140 is positioned at one side of the width direction DW of the tank 10 to facilitate the concentrated discharge and subsequent treatment of sludge.

Alternatively, the waste liquid collection tube 140 is located on one side of the width direction DW of the housing 10.

Alternatively, the air floating tank 20, the sludge tank 60, the intermediate water tank 30, the multi-stage purifying and filtering device 40, the clean water tank 50, and the filter press 70 are sequentially arranged in the length direction DL. Each processing unit is arranged along the length direction DL in sequence, so that the wastewater treatment flow is smoother. The wastewater enters from the air floatation tank 20, sequentially passes through the treatment units and finally enters the clean water tank 50, so that continuous and efficient treatment of the wastewater is realized. And moreover, wastewater does not need to be frequently transported among the treatment units, so that the energy consumption and pollution risk in the transportation process are reduced, and the treatment efficiency is improved.

In the present utility model, the outlet of the floatation tank 20 is connected to the sludge tank 60 and the intermediate water tank 30, respectively. The sludge tank 60 and the middle water tank 30 are distributed along the length direction DL, and the sludge tank 60 is arranged close to the air floatation tank 20, so that the conveying distance of scum and sediment in the air floatation tank 20 is shortened, the scum and sediment can be rapidly discharged into the sludge tank 60 from the air floatation tank 20, and the treatment efficiency is improved. Meanwhile, the residence time of the sewage in the air floatation tank 20 is reduced, so that the treatment process is more compact, and the treatment speed of the whole sewage treatment system is increased. The flow path of the wastewater in the system is smoother, and the resistance and energy consumption possibly generated due to the complex pipeline are reduced.

Further, the air floatation tank 20, the middle water tank 30, the multi-stage purifying and filtering device 40, the sludge tank 60, the clean water tank 50 and the filter press 70 are respectively connected with the waste liquid collecting pipe 140 through pipelines, and the waste liquid collecting pipe 140 can collect waste liquid of a plurality of devices of the air floatation tank 20, the middle water tank 30, the multi-stage purifying and filtering device 40, the sludge tank 60, the filter press 70 and the clean water tank 50. Alternatively, the waste liquid collecting pipe 140 is located at one side of the air floating pond 20, the intermediate pond 30, the multi-stage purifying and filtering device 40, the sludge pond 60, the filter press 70, and the clean water pond 50 in the width direction DW of the tank 10, and extends from the filter press 70 to the air floating pond 20 and out of the tank 10. That is, the waste liquid collecting pipe 140 starts from the filter press 70, passes through the clean water tank 50, the multi-stage purifying and filtering device 40, the intermediate water tank 30, the sludge tank 60 and the air floatation tank 20, and then extends to the outside of the tank 10. Wherein, the air floatation tank 20, the middle water tank 30 and the clean water tank 50 are connected with the waste liquid collecting pipe 140 so as to be convenient for emptying during maintenance. The air floatation tank 20, the middle water tank 30, the clean water tank 50 and the filter press 70 share the same main wastewater pipe, so that not only is the pipeline space saved and the cost saved, but also the complexity of pipeline arrangement is avoided, and deposition and scaling are not easy to occur in the pipeline.

Alternatively, the clean water tank 50 discharges clean water out of the tank 10 through the reuse water pipe 130, and the reuse water pipe 130 is located at one side of the tank 10 in the width direction DW. Specifically, the reuse water pipe 130 and the waste liquid collection pipe 140 are located on the same side in the width direction DW of the tank 10.

Alternatively, the air floating tank 20 is connected to the sludge tank 60 through a first sludge pipe 151, and the first sludge pipe 151 is located at one side of the width direction DW of the tank 10. Specifically, the first sludge pipe 151 and the waste liquid collecting pipe 140 are located on the same side in the width direction DW of the casing 10.

Alternatively, the sludge tank 60 is connected to the filter press 70 through a second sludge pipe 152, and the second sludge pipe 152 is located at one side of the width direction DW of the tank 10. Specifically, the second sludge pipe 152 and the waste liquid collecting pipe 140 are located on the same side in the width direction DW of the tank 10.

In the utility model, the recycling water pipe 130, the first sludge pipe 151, the second sludge pipe 152 and the waste liquid collecting pipe 140 are arranged on the same side, so that the space occupation of the pipeline in the width direction DW of the box body 10 is reduced, the overall arrangement is more compact, and meanwhile, the subsequent uniform discharge and treatment are convenient, and the treatment efficiency is improved.

Optionally, a wastewater inlet pipe 120 is connected to the floatation tank 20 for delivering wastewater into the floatation tank 20.

Optionally, a tap water pipe 110 is connected to the dosing device 80 for delivering tap water into the dosing device 80.

Optionally, the case 10 is centrally provided with inlets 11 in one area. Illustratively, the inlet 11 is centrally disposed at one end of the housing 10 in the length direction DL. Optionally, the number of inlets 11 is adapted according to the pipe diameter and number of the connected pipes. An external conduit extends from inlet 11 into tank 10. Specifically, the inlet 11 is provided with four inlets respectively connected to the return water pipe 130, the waste liquid collecting pipe 140, the waste water inlet pipe 120 and the tap water pipe 110. All the pipelines which need to be connected into the box body 10 are connected through the inlets 11 in the same area, so that the number of external connectors and pipelines is reduced, the complexity and the failure rate of the system are reduced, and meanwhile, operators are more convenient to connect and disconnect the pipelines, and the pipelines are convenient to maintain and overhaul daily.

The cold chain shipping container wash waste water may contain a variety of contaminants such as oil stains, detergent residues, microorganisms, suspended matter, and the like.

The wastewater to be treated is introduced into the floatation tank 20. The water from the air floatation tank 20 is collected to the middle water tank 30 through a pipeline via a water outlet. The intermediate water tank 30 is lifted by the pump 43 to convey the sewage of the intermediate water tank 30 to the filtration module sand filtration tank and the carbon filtration tank for step-by-step treatment. The effluent of the carbon filter tank is collected into a clean water tank 50, and clean water in the clean water tank 50 is discharged out of the tank body 10 through a reuse water pipe 130 by a reuse water pump 51 for secondary reuse. The sludge in the floatation tank 20 is collected to the sludge tank 60 through a sewage outlet by a pipeline. The sludge in the sludge tank 60 is pumped to the plate and frame filter press 70 by a screw pump and a sludge transfer pipe to be dehydrated. The dehydrated waste liquid is delivered to the outside of the tank through the waste liquid collecting pipe 140 via the water inlet. Optionally, the dehydrated waste liquid enters a waste water treatment device for further treatment.

The floatation tank 20 has a good effect on removing suspended matters and grease in the wastewater. The floatation tank 20 adopts polyaluminium chloride (PAC, polyaluminum chloride) and polyacrylamide (PAM, polyacrylic amide) as coagulants, and PAC and PAM provide coagulation effects for floatation reaction and sludge conditioning, strengthen reaction effects and improve floatation water treatment efficiency.

Optionally, the floatation tank 20 treats the contaminants through a dissolved air tank 21. The air bubbles released by the air-dissolving water generated by the air-floating pond 20 through the air-dissolving tank 21 through the releaser can efficiently capture and adsorb suspended particles and pollutants in the water body, so that the treatment efficiency is remarkably improved.

Alternatively, the floatation tank 20 is connected with the waste liquid collecting pipe 140 through a pipeline, so that waste liquid can be conveniently discharged out of the tank 10 through the waste liquid collecting pipe 140 during maintenance.

The wastewater treated by the air floatation tank 20 enters the middle water tank 30 and is further treated by the multi-stage purifying and filtering device 40. Optionally, the multi-stage purification filter device 40 includes a sand filter 41 and a carbon filter 42. Optionally, a carbon filter 42 is located downstream of the sand filter 41. The wastewater is first subjected to a preliminary filtration through a sand filter 41 to remove larger suspended solids, particulates and impurities. The primarily purified wastewater then enters the carbon filter 42 for further treatment. The step-by-step filtration mode can remove pollutants in the wastewater more effectively, and the overall purification effect is improved. The overall treatment efficiency is improved, and the wastewater treatment capacity is increased.

The multi-stage purification filter device 40 can further remove fine suspended matters and soluble pollutants in the wastewater, and helps to improve the purification effect of the wastewater so as to achieve the emission standard or the recycling requirement.

Optionally, a pump is provided before the multi-stage purification filter device 40. Alternatively, the pump employs a lift pump 43. The lift pump 43 can ensure that the wastewater timely and stably enters the multi-stage purification and filtration device 40, and avoid the reduction of treatment efficiency caused by insufficient flow or interruption, thereby being capable of adapting to the wastewater treatment capacity of large flow.

Alternatively, the sand filter 41 and the carbon filter 42 in the multi-stage purifying and filtering device 40 are respectively connected with the waste liquid collecting pipe 140 through pipelines, so that waste liquid can be conveniently discharged out of the box 10 through the waste liquid collecting pipe 140 during maintenance.

The sludge generated in the air floating pond 20 is introduced into the sludge pond 60 through the first sludge pipe 151 to be primarily collected, and then is dehydrated by the filter press 70. The floatation tank 20 forms a scum layer by adhesion of microbubbles to suspended particles, grease, and other contaminants during the treatment of wastewater. The slag layer is collected by a slag scraper and the like and then conveyed to the sludge tank 60 through a pipeline. As the cold chain container carries more foods such as meat, the sludge generated by sewage treatment is a common solid waste, and no hazardous waste is involved.

The sludge tank 60 serves as a preliminary collection container for sludge, and is capable of temporarily storing sludge from the floatation tank 20 and other wastewater treatment units that may produce sludge. After preliminary collection in the sludge basin 60, the moisture content of the sludge is still high, which is inconvenient for subsequent transportation and disposal. Therefore, it is necessary to carry out dehydration treatment by an apparatus such as the filter press 70. The sludge tank 60 is connected to the filter press 70 through a second sludge pipe 152.

The filter press 70 extrudes water in the sludge through mechanical force to form a mud cake with lower water content, which is convenient for subsequent treatment or disposal, and reduces the transportation and treatment cost of the sludge by reducing the volume of the sludge. The sludge treated by the filter press 70 is discharged out of the tank 10 through a sludge pipe, thereby realizing continuous and efficient treatment of the sludge.

Alternatively, the door 12 of the casing 10 is provided at one side of the longitudinal direction DL of the casing 10 near the filter press 70, so as to facilitate the transportation of the sludge cake out of the casing 10.

Optionally, the wastewater treatment apparatus further comprises a dosing device 80. The dosing device 80 comprises a PAC dosing device and a PAM dosing device, the PAC dosing device is connected to the air floatation tank 20 through a PAC dosing pipe 81 for providing PAC to the air floatation tank 20. The PAM dosing device is connected to the floatation tank 20 through a PAM dosing tube 82 for providing PAM to the floatation tank 20. Alternatively, the drug delivery device 80 is capable of continuous drug delivery. The continuous feeding function of the dosing device 80 ensures the stability of the concentration of the medicament in the air floatation tank 20, and avoids the problem of unstable treatment effect caused by the fluctuation of the concentration of the medicament.

Alternatively, the dosing device 80 is located on the other side of the width direction DW of the housing 10. That is, the chemical adding device 80, the waste liquid collecting pipe 140, the recycling water pipe 130 and other pipelines are positioned on different sides of the box 10 along the width direction DW, so that the space of the box 10 can be fully utilized, the mutual interference among devices is reduced, and the rationality and compactness of the overall layout are improved. The layout mode enables maintenance and management of equipment to be more convenient. For example, when the chemical dosing apparatus 80 is overhauled or replaced, the operation of the waste liquid collecting or recycling water pipe 130 is not required to be interrupted, and the maintainability and the reliability of equipment are improved.

Optionally, a stack 83 is located adjacent to the drug delivery device 80. Specifically, the stack 83 is located on the same side of the case 10 in the width direction DW as the dosing device 80. Simplifying the material handling and feeding process. The operator can more conveniently take the medication from the stack 83 and directly feed it into the dosing device 80, reducing the need to span the bin 10 or carry it over long distances.

In the present utility model, the wastewater treatment apparatus further includes an electronic control apparatus 90. The electronic control device 90 is capable of controlling the start and stop of the wastewater treatment system. Through a preset program or operation interface, an operator can conveniently start or stop the whole system, and remote or on-site control of equipment is realized. The electronic control device 90 allows an operator to set and adjust various parameters required for system operation, such as intake flow, pump operating frequency, dosing, etc.

Specifically, the electric control device 90 is electrically connected or in communication with the dissolved air tank 21, the lift pump 43, the screw pump 71, the reuse water pump 51, the filter press 70, and the dosing device 80, respectively, so as to control the electromechanical device, the water pump, and other devices.

The electronic control device 90 is capable of controlling the on-off states and operating parameters of various pumps and valves in the wastewater treatment system. By accurately controlling parameters such as flow, lift and opening of a valve of the pump, smooth flow and reasonable distribution of wastewater in the system can be ensured.

The following is illustrated by specific examples:

Integrated equipment for treating cleaning wastewater of cold chain transport container of certain harbor:

size, length x width x height = 12192 x 2438 x 2896mm.

The dead weight is 10.5T, and the running weight is 110T.

The material is weather-resistant steel SPA-H.

The device comprises an air floatation tank 20, a middle water tank 30, a filtering module, a sludge dewatering module, a dosing module and an electric control unit.

The treatment capacity is 15m ³/d, and the requirement of the tank body 10 on the cleaning wastewater can be realized by treatment according to the environmental protection requirement of the place where the project is located, namely the requirement of the reuse of the wastewater can be met, namely the wastewater reaches the standard of flushing toilet and vehicle flushing of urban miscellaneous Water quality for urban wastewater recycling (GB/T18920-2020), and the wastewater is discharged into a reuse water system of a wharf after treatment.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains. The terminology used herein is for the purpose of describing particular implementations only and is not intended to be limiting of the utility model. Terms such as "disposed" or the like as used herein may refer to either one element being directly attached to another element or one element being attached to another element through an intermediate member. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features unless the features are not applicable or otherwise indicated in the other embodiment.

The present utility model has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the utility model to the embodiments described. Those skilled in the art will appreciate that many variations and modifications are possible in light of the teachings of the utility model, which variations and modifications are within the scope of the utility model as claimed.

Claims (10)

1. A wastewater treatment device is used for treating cold chain transportation container washing wastewater and is characterized by comprising a box body, wherein an air floatation tank is arranged in the box body, a water outlet of the air floatation tank is sequentially connected with a middle water tank, a multi-stage purification filtering device and a clean water tank through pipelines, a sewage draining outlet of the air floatation tank is sequentially connected with a sludge tank and a filter press through pipelines, the filter press discharges sewage out of the box body through a waste liquid collecting pipe,

The air floatation tank, the middle water tank, the multi-stage purifying and filtering device and the clean water tank are arranged along the length direction of the tank body;

The air floatation tank, the sludge tank and the filter press are arranged along the length direction of the box body;

the waste liquid collecting pipe is located at one side of the box body in the width direction.

2. The wastewater treatment apparatus according to claim 1, wherein the air floatation tank, the sludge tank, the intermediate tank, the multistage purification filter device, the clean water tank and the filter press are arranged in this order along the length direction.

3. The wastewater treatment apparatus according to claim 1 or 2, wherein the air floatation tank, the intermediate water tank, the multistage purification and filtration device, the sludge tank, the clean water tank and the filter press are connected with the waste liquid collecting pipe through pipelines, respectively;

The waste liquid collecting pipe is positioned at one side of the air floatation tank, the middle water tank, the multi-stage purifying and filtering device, the sludge tank, the clean water tank and the filter press along the width direction of the tank body.

4. The wastewater treatment apparatus according to claim 1, wherein,

The clean water tank discharges clean water out of the tank body through a reuse water pipe, the reuse water pipe and the waste liquid collecting pipe are positioned at the same side of the width direction of the tank body, and/or

The air floatation tank is connected with the sludge tank through a first sludge pipe, the first sludge pipe and the waste liquid collecting pipe are positioned at the same side of the box body in the width direction, and/or

The sludge tank is connected with the filter press through a second sludge pipe, and the second sludge pipe and the waste liquid collecting pipe are positioned on the same side of the box body in the width direction.

5. The apparatus of claim 1, wherein the housing defines an inlet, and wherein an external conduit extends from the inlet into the housing,

The inlet is arranged close to the air floatation tank.

6. The wastewater treatment plant according to claim 1, characterized in that the tank is provided with a door, which is arranged close to the filter press.

7. The wastewater treatment apparatus of claim 1, further comprising a dosing device, wherein,

The chemical adding device is positioned at the other side of the width direction of the box body and/or

The dosing device comprises a PAC dosing device and a PAM dosing device.

8. The wastewater treatment apparatus of claim 7, further comprising a tap water pipe extending into the tank through an inlet, and the tap water pipe being in communication with the dosing device.

9. The wastewater treatment apparatus according to claim 1, wherein,

A pump is arranged between the sludge tank and the filter press, and/or

And a pump is arranged between the intermediate water tank and the multi-stage purifying and filtering device.

10. The wastewater treatment plant of claim 1, wherein the multi-stage purification filtration device comprises a sand filter and a carbon filter, the carbon filter being located downstream of the sand filter.