Waste treatment device

Abstract

The waste treatment device provided by the invention comprises a shell, and the shell is internally provided with an anaerobic zone, a waste inlet system is arranged at the bottom of the anaerobic zone, and the anaerobic zone is arranged at the lower part of the shell; the first anoxic zone is arranged above the anaerobic zone, and waste rotational flow is formed in the anaerobic zone and the first anoxic zone; the first aerobic zone is arranged above the first anoxic zone, a first perforated partition plate is arranged between the first anoxic zone and the first aerobic zone, the second anoxic zone is arranged above the first aerobic zone, and waste rotational flow is formed in the first aerobic zone and the second anoxic zone; the second aerobic zone is arranged above the second anoxic zone, and a second perforated partition plate is arranged between the second anoxic zone and the second aerobic zone; the coagulation zone is arranged in the middle of the upper part of the second aerobic zone, the settling zone is arranged at the top of the shell and outside the second aerobic zone, and the coagulation zone and the settling zone are communicated through the communicating pipe. Therefore, the occupied area of the equipment is small; the construction cost is low; the energy consumption and the operation cost are low; daily maintenance workload is small, and equipment maintenance is simple; the waste gas is effectively treated; and site selection is simple.

Description

Technical Field

[0001] This invention relates to the field of waste treatment, specifically a waste treatment device. Background Technology

[0002] Integrated treatment of wastewater and exhaust gas typically employs the anaerobic-aerobic (AO) process. Current wastewater and exhaust gas treatment technologies usually involve horizontally arraying multiple square tanks to perform the various steps of the AO process; each tank operates independently, resulting in poor coordination and a loose process cycle.

[0003] Therefore, existing integrated wastewater and waste gas treatment systems have the following problems: large footprint; high construction cost; high energy consumption and high operating cost; cumbersome daily maintenance and difficult equipment maintenance; harmful gases such as methane (CH4), hydrogen sulfide (H2S), and ammonia (NH3) produced in anaerobic and anoxic ponds are burned or directly emitted, causing air pollution, for example, H2S + O2 combustion produces SO2 + H2O; site selection is relatively difficult, generally requiring the selection of low-lying and flat sites with good geological conditions. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the technical problems to be solved by the present invention are: how to reduce the footprint; reduce construction costs; reduce energy consumption and operating expenses; reduce daily maintenance workload and equipment maintenance difficulty; reduce the generation of harmful gases; and reduce site selection difficulty.

[0005] To address the aforementioned technical problems, this invention provides a waste treatment device for treating sewage, suspended solid waste (sludge), and exhaust gas. Its objectives are: to reduce the footprint; to lower construction costs; to reduce energy consumption and operating expenses; to reduce daily maintenance workload and equipment maintenance difficulty; to reduce the generation of harmful gases; and to reduce site selection difficulty.

[0006] The present invention provides a waste treatment device, including a shell, the interior of which are distributed an anaerobic zone, a first anoxic zone, a first aerobic zone, a second anoxic zone, a second aerobic zone, a coagulation zone and a sedimentation zone;

[0007] The bottom of the anaerobic zone is equipped with a waste inlet system, and the anaerobic zone is located in the lower part of the shell;

[0008] The first anoxic zone is located above the anaerobic zone, and a vortex of waste is formed in both the anaerobic zone and the first anoxic zone;

[0009] The first aerobic zone is located above the first anoxic zone. A first perforated partition is provided between the first anoxic zone and the first aerobic zone. The second anoxic zone is located above the first aerobic zone. A vortex of waste is formed in the first aerobic zone and the second anoxic zone.

[0010] The second aerobic zone is located above the second hypoxic zone, and a second perforated partition is provided between the second hypoxic zone and the second aerobic zone.

[0011] The coagulation zone is located in the upper middle part of the second aerobic zone, and the sedimentation zone is located at the top of the shell, outside the second aerobic zone. The coagulation zone and the sedimentation zone are connected by a connecting pipe.

[0012] Preferably, the second aerobic zone is connected to the first aerobic zone through a mixed liquor return pipe, and a mixed liquor return pump is provided on the mixed liquor return pipe;

[0013] The inlet of the mixed liquor reflux pipe is located in the lower middle part of the second aerobic zone;

[0014] A first nozzle is provided at the outlet of the mixed liquor reflux pipe in the first aerobic zone. The first nozzle is arranged at an angle to the horizontal plane to form a swirling flow in the first aerobic zone.

[0015] The outlet of the mixed liquor reflux pipe is located at the bottom of the first aerobic zone.

[0016] Preferably, the sedimentation zone is connected to the anaerobic zone and the first anoxic zone through a sludge return pipe, and a sludge return pump is installed on the sludge return pipe.

[0017] The inlet of the sludge return pipe is located at the bottom of the sedimentation zone;

[0018] The outlet of the sludge return pipe is located at an adjacent position between the anaerobic zone and the first anoxic zone;

[0019] A second nozzle is installed at the outlet of the sludge return pipe. The second nozzle is arranged at an angle to the horizontal plane to form a vortex in the anaerobic zone and the first anoxic zone.

[0020] A sludge discharge valve is installed at the lowest point of the sludge return pipe to control the discharge of sludge from the sedimentation zone.

[0021] Preferably, an air intake pipe system is provided above the second perforated partition and at the bottom of the second aerobic zone. The air intake pipe system includes horizontally and vertically interconnected pipes, and microporous aerators are installed on the pipes. The air intake pipe system is connected to the outside of the shell to blow outside air to the microporous aerators.

[0022] Preferably, the bottom of the coagulation zone is below the liquid surface of the second aerobic zone, the lower part of the coagulation zone is surrounded by the liquid in the second aerobic zone, the coagulation zone is separated from the liquid in the second aerobic zone by the side wall of the coagulation zone, and a third perforated baffle is provided at the bottom of the coagulation zone, through which the liquid in the second aerobic zone enters the coagulation zone.

[0023] A guide vane is installed on the inner side of the sidewall of the coagulation zone for gas-liquid separation;

[0024] The inlet of the connecting pipe is located near the guide plate, inside the side wall of the coagulation zone, above the guide plate, and in the middle of the vertical direction of the coagulation zone;

[0025] The second aerobic zone and the sedimentation zone are separated by the sidewall of the second aerobic zone;

[0026] The outlet of the connecting pipe is located at the upper part of the sedimentation zone and on the outer side of the side wall of the second aerobic zone;

[0027] Add polyaluminum chloride or polyacrylamide to the coagulation zone;

[0028] The bottom of the side wall of the second aerobic zone is equipped with an anti-pressure and anti-floating device. The anti-pressure and anti-floating device is U-shaped and is used to prevent the side wall of the second aerobic zone from floating when waste initially enters and to resist the pressure of sludge in the sedimentation zone on the side wall of the second aerobic zone when the waste in the shell is emptied.

[0029] The middle of the sidewall of the second aerobic zone is tiered with a large opening at the bottom and a small opening at the top. Columnar biological packing material is set in the second aerobic zone, with the upper edge of the biological packing material fitting against the tiered sidewall of the second aerobic zone.

[0030] The coagulation zone is located above the biological packing material;

[0031] The liquid levels in the second aerobic zone, the coagulation zone, and the sedimentation zone are provided with a safe distance of 300–500 mm from the top surface of the shell.

[0032] Preferably, a collection tank is provided at the top of the sedimentation zone;

[0033] The liquid collection tank is located inside the shell, and the upper edge of the liquid collection tank is located above the outlet of the connecting pipe;

[0034] A liquid outlet pipe is provided at the bottom of the liquid collection tank to discharge the treated liquid out of the shell;

[0035] A perforated sludge collection pipe is installed at the bottom of the sedimentation zone, and the perforated sludge collection pipe is connected to the sludge return pipe.

[0036] Preferably, a sludge discharge valve is provided at the bottom of the shell to control the discharge of sludge from the shell or to empty the shell.

[0037] Preferably, the waste inlet system is a pipeline arranged in both horizontal and vertical directions, with a liquid outlet hole on the pipeline, the diameter of which is 25mm to 30mm.

[0038] Preferably, the interior of the shell is cylindrical;

[0039] The second aerobic zone is divided into three sections: the bottom section is a first cylindrical shape, the middle section is a frustum shape, and the top section is a second cylindrical shape.

[0040] The first cylinder occupies the entire internal space of the shell at the corresponding height. The frustum shape is larger at the bottom and smaller at the top. The diameter of the second cylinder is smaller than that of the first cylinder.

[0041] The sedimentation zone is the space enclosed by the inner side of the shell and the side wall of the second aerobic zone. It is an annular bucket-shaped structure that forms a mud collection bucket.

[0042] Biological packing material is placed in the frustum-shaped area. The outer contour of the biological packing material is cylindrical, and the upper edge of the biological packing material is in contact with a cross-sectional circle of the frustum-shaped area to ensure that all waste passes through the biological packing material.

[0043] The coagulation zone is located above the biological packing material;

[0044] The inlet of the mixed liquor reflux pipe connecting the second aerobic zone and the first aerobic zone extends into the lower part of the frustum shape, with the opening facing upwards.

[0045] Preferably, a sludge return pipe is connected between the sedimentation zone and the area formed by the anaerobic zone and the first anoxic zone. A sludge return pump is installed on the sludge return pipe. The inlet of the sludge return pipe is installed at the lower part of the sedimentation zone. A first dissolved oxygen meter is installed near the inlet of the sludge return pipe at the same level.

[0046] A second dissolved oxygen meter is installed at the midpoint of the radial direction of the shell, adjacent to the first aerobic zone and the second anoxic zone.

[0047] A third dissolved oxygen meter is installed in the first anoxic zone near the first perforated partition and in the middle of the radial direction of the shell.

[0048] A fourth dissolved oxygen meter is installed at the junction of the anaerobic zone and the first anoxic zone, near the center of the shell in the radial direction.

[0049] A mixed liquor return pipe is connected between the second aerobic zone and the first aerobic zone, and a mixed liquor return pump is installed on the mixed liquor return pipe;

[0050] An air intake pipe system is installed above the second perforated partition and at the bottom of the second aerobic zone. The air intake pipe system aerates air into the second aerobic zone through an air intake pump.

[0051] The aeration rate is controlled by controlling the air intake pump, so that the dissolved oxygen concentration at the first dissolved oxygen meter is controlled at the first dissolved oxygen concentration set value; the first dissolved oxygen concentration set value is 1 mg / L to 1.5 mg / L.

[0052] By controlling the flow rate of the mixed liquor reflux pump, the dissolved oxygen concentration at the second dissolved oxygen meter is controlled at the second dissolved oxygen concentration setpoint. Furthermore, by controlling the flow rate of the mixed liquor reflux pump, the distribution ratio of the first aerobic zone and the second anoxic zone, as well as the hydraulic residence time of waste in the first aerobic zone and the second anoxic zone, are changed. When the flow rate of the mixed liquor reflux pump is increased, the volume of the first aerobic zone increases, the volume of the second anoxic zone decreases, and the oxidation time is prolonged. The second dissolved oxygen concentration setpoint is 0.6 mg / L to 0.8 mg / L.

[0053] By controlling the flow rate of the sludge return pump, the dissolved oxygen concentration at the third dissolved oxygen meter is controlled at the third dissolved oxygen concentration setpoint, and the dissolved oxygen concentration at the fourth dissolved oxygen meter is controlled at the fourth dissolved oxygen concentration setpoint; furthermore, by controlling the flow rate of the sludge return pump, the hydraulic retention time of waste in the anaerobic zone and the first anoxic zone is changed; the third and fourth dissolved oxygen concentration setpoints are 0.2 mg / L to 0.5 mg / L.

[0054] Measurement, control, and data processing are performed using a programmable logic controller (PLC).

[0055] Preferably, the waste contains methane, ammonia, hydrogen sulfide, or sulfur dioxide after passing through the anaerobic zone;

[0056] After passing through the first oxygen-deficient zone, there is methane, ammonia, nitrogen, hydrogen sulfide, or sulfur dioxide.

[0057] After passing through the first aerobic zone, there is carbon dioxide, nitrogen, or some methane, ammonia, hydrogen sulfide, or sulfur dioxide;

[0058] After passing through the second anoxic zone, there is carbon dioxide, nitrogen, or some methane, hydrogen sulfide, or sulfur dioxide.

[0059] After passing through the second aerobic zone, there are carbon dioxide, nitrogen, nitrate, or sulfate ions;

[0060] Carbon dioxide and nitrogen gases overflow from the liquid surface of the second aerobic zone, the liquid surface of the coagulation zone, or the liquid surface of the sedimentation zone, and are discharged outside the shell 10.

[0061] Preferably, the housing is mounted at ground level; or,

[0062] The shell is located below the ground level of the site and above the regulating tank; or,

[0063] The shell is located below the site's ground level. The soft soil layer is excavated down to the designed bearing layer, and the equipment foundation is constructed on this layer. The shell rests on the equipment foundation. Alternatively,

[0064] The installation plan for the shell is designed based on the water level of the waste, the topography and geological conditions of the site.

[0065] Compared with the prior art, the present invention provides a waste treatment device, including a shell, the interior of which are distributed an anaerobic zone, a first anoxic zone, a first aerobic zone, a second anoxic zone, a second aerobic zone, a coagulation zone, and a sedimentation zone; a waste inlet system is provided at the bottom of the anaerobic zone, which is located at the lower part of the shell; the first anoxic zone is located above the anaerobic zone, and a vortex of waste is formed in the anaerobic zone and the first anoxic zone; the first aerobic zone is located above the first anoxic zone, and a first perforated partition is provided between the first anoxic zone and the first aerobic zone; the second anoxic zone is located above the first aerobic zone, and a vortex of waste is formed in the first aerobic zone and the second anoxic zone; the second aerobic zone is located above the second anoxic zone, and a second perforated partition is provided between the second anoxic zone and the second aerobic zone; the coagulation zone is located at the upper middle part of the second aerobic zone, and the sedimentation zone is located at the top of the shell and outside the second aerobic zone, and the coagulation zone and the sedimentation zone are connected by a connecting pipe. Accordingly, the technical effects achieved by the present invention are as follows: small footprint; low construction cost; low energy consumption and low operating costs; low daily maintenance workload and simple equipment maintenance; effective treatment of waste gas; and relatively simple site selection. Attached Figure Description

[0066] Figure 1 This is a schematic diagram of the waste treatment device provided by the present invention.

[0067] Figure 2 A flow chart of the harmful gas degradation process of the waste treatment device provided by the present invention.

[0068] Figure 3 A schematic diagram of the layout of the waste inlet system of the waste treatment device provided by the present invention.

[0069] Figure 4 The diagram shows the perforations on the first and second perforated partitions of the waste treatment device provided by the present invention, the holes for the guide rails for mounting sensors, and the arrangement of the air intake pipe system.

[0070] Figure 5 This is a diagram showing the arrangement of sensors in the waste treatment device provided by the present invention.

[0071] Figure 6 This is an embodiment of the installation layout diagram of the waste treatment device provided by the present invention.

[0072] Figure 7This is another embodiment of the installation layout diagram of the waste treatment device provided by the present invention.

[0073] Explanation of reference numerals in the attached figures:

[0074] 10 housing

[0075] 11 First perforated partition

[0076] 12 Second perforated partition

[0077] 121 Perforation

[0078] 13 Connecting pipes

[0079] 131. Inlet of the connecting pipe

[0080] 132. Outlet of the connecting pipe

[0081] 14. Sludge discharge and venting valve

[0082] 15 Site Surface

[0083] 16. Equalization Tank

[0084] 161 Booster Pump

[0085] 20 Anaerobic Zone

[0086] 30 First hypoxia zone

[0087] 40 First Aerobic Zone

[0088] 50 Second hypoxic zone

[0089] 60 Second aerobic zone

[0090] 61 Mixture reflux pipe

[0091] 62 Mixture reflux pump

[0092] 63. Inlet of the mixed liquid reflux pipe

[0093] 64. Outlet of the mixed liquid reflux pipe

[0094] 65 First nozzle

[0095] 66 Second aerobic zone sidewall

[0096] 661 First cylindrical shape

[0097] 662 Frustum shape

[0098] 663 Second cylinder

[0099] 67. Anti-pressure and anti-buoyancy device

[0100] 68. Biological packing material

[0101] 69. Liquid level in the second aerobic zone

[0102] 70 Concrete Zone

[0103] 71 Concrete Zone Sidewall

[0104] 72 Third perforated partition

[0105] 73 deflector

[0106] 74. Liquid level in the coagulation zone

[0107] 80 sedimentation zone

[0108] 81 Sludge Return Pipe

[0109] 82 sludge return pump

[0110] 83 Sludge Return Pipe Inlet

[0111] 84 Sludge Return Pipe Outlet

[0112] 85 Second Nozzle

[0113] 86 Sludge Discharge Valve

[0114] 87 collection tank

[0115] 88 liquid outlet pipeline

[0116] 89 sedimentation zone liquid level

[0117] 91 Waste Inlet System

[0118] 911 piping

[0119] 912 liquid outlet

[0120] 913 Waste Inlet

[0121] 92 intake system

[0122] 921 piping

[0123] 922 Microporous Aerator

[0124] 923 air intake

[0125] 924 intake pump

[0126] 931 First Dissolved Oxygen Analyzer

[0127] 932 Second Dissolved Oxygen Analyzer

[0128] 933 Third Dissolved Oxygen Analyzer

[0129] 934 Fourth Dissolved Oxygen Analyzer

[0130] 935 mounting rod

[0131] 936 mounting holes. Detailed Implementation

[0132] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0133] See Figure 1 As shown, the waste treatment device provided by this invention is used to treat waste containing wastewater, suspended solid waste (sludge), and waste gas. The device exhibits a fluid dynamic structure and employs a vertically arranged multi-stage AO process. The waste treatment device includes a shell 10. Inside the shell 10, vertically arranged from bottom to top, are an anaerobic zone 20, a first anoxic zone 30, a first aerobic zone 40, a second anoxic zone 50, a second aerobic zone 60, a coagulation zone 70, and a sedimentation zone 80, arranged vertically. A waste inlet system 91 is located at the bottom of the anaerobic zone 20. The anaerobic zone 20 is located at the lower part of the shell 10. The first anoxic zone 30 is located above the anaerobic zone 20. A vortex of waste is formed within the anaerobic zone 20 and the first anoxic zone 30, and the vortex... Figure 1 As shown by the dotted arrow, the direction of the arrow in the diagram is not limited; a counter-clockwise vortex can also be formed. The first aerobic zone 40 is located above the first anoxic zone 30. A first perforated baffle 11 is provided between the first anoxic zone 30 and the first aerobic zone 40. The second anoxic zone 50 is located above the first aerobic zone 40. A vortex of waste is formed within the first aerobic zone 40 and the second anoxic zone 50. The vortex... Figure 1 As shown by the dotted arrow, the direction of the arrow in the illustration is not limited; a counter-clockwise swirling flow can also be formed. The second aerobic zone 60 is located above the second anoxic zone 50, and a second perforated baffle 12 is provided between the second anoxic zone 50 and the second aerobic zone 60. The coagulation zone 70 is located in the upper middle part of the second aerobic zone 60, and the sedimentation zone 80 is located at the top of the shell 10 and outside the second aerobic zone 60. The coagulation zone 70 and the sedimentation zone 80 are connected by a connecting pipe 13.

[0134] In the anaerobic zone 20, an inspection port is provided on the side wall of the shell 10 for maintenance of the waste inlet system, etc.

[0135] Anaerobic zone 20 and first anoxic zone 30 are in the same fixed-volume physical space (between the bottom of shell 10 and the first perforated partition 11). The dashed line between anaerobic zone 20 and first anoxic zone 30 is only a virtual separation of the functional areas. This virtual separation can also be changed to adjust the volume ratio of anaerobic zone 20 and first anoxic zone 30.

[0136] The first aerobic zone 40 and the second hypoxic zone 50 are in the same fixed-volume physical space (between the first perforated partition 11 and the second perforated partition 12). The dotted line between the first aerobic zone 40 and the second hypoxic zone 50 is only a virtual separation of the functional areas. This virtual separation can also be changed to adjust the volume ratio of the first aerobic zone 40 and the second hypoxic zone 50.

[0137] The waste treatment device provided by this invention adopts a simple and compact vertical distribution structure, which occupies a small area.

[0138] See Figure 1 As shown, the second aerobic zone 60 and the first aerobic zone 40 are connected by a mixed liquor return pipe 61, on which a mixed liquor return pump 62 is installed. The inlet 63 of the mixed liquor return pipe is located in the lower middle part of the second aerobic zone 60. A first nozzle 65 is installed at the outlet 64 of the mixed liquor return pipe in the first aerobic zone 40. The first nozzle 65 is arranged at an angle to the horizontal plane to form a vortex in the first aerobic zone 40; the angle of this angle can be set to 30° to 60°, preferably 45°; this vortex can be formed without providing a rotating stirring device. The outlet 64 of the mixed liquor return pipe is located at the lower part of the first aerobic zone 40. No microporous aeration device is installed in the first aerobic zone 40; oxygenation and circulation are achieved by the mixed liquor return from the second aerobic zone. Only a microporous aeration device needs to be installed in the second aerobic zone 60.

[0139] See Figure 1 As shown, the sedimentation zone 80 is connected to the area formed by the anaerobic zone 20 and the first anoxic zone 30 via a sludge return pipe 81, on which a sludge return pump 82 is installed. The inlet 83 of the sludge return pipe is located at the lower part of the sedimentation zone 80. The outlet 84 of the sludge return pipe is located adjacent to the anaerobic zone 20 and the first anoxic zone 30. A second nozzle 85 is provided at the outlet 84 of the sludge return pipe. The second nozzle 85 is arranged at an angle to the horizontal plane to form a vortex in the anaerobic zone 20 and the first anoxic zone 30; the angle of this inclination can be set to 30° to 60°, preferably 45°; this vortex can be formed without providing a rotating stirring device.

[0140] The first anoxic zone 30 utilizes the sludge recirculation from the sedimentation zone to create an anoxic environment and a swirling state.

[0141] See Figure 1 As shown, a sludge discharge valve 86 is installed at the lowest point of the sludge return pipe 81 to control the discharge of sludge from the sedimentation zone.

[0142] Because the sedimentation zone 80 is annular and bucket-shaped, it forms a sludge collection hopper. In order to allow the sludge to be circulated throughout the entire circumference, a perforated sludge collection pipe is installed at the bottom of the sedimentation zone 80. The opening of the perforated sludge collection pipe faces the sludge and is connected to the sludge return pipe.

[0143] Waste enters sedimentation zone 80 for settling. The lower part of sedimentation zone 80 is hopper-shaped, and a perforated sludge discharge pipe is installed in the sludge collection hopper. The perforated sludge discharge pipe is connected to sludge return pipe 81, and the sludge is returned to the first anoxic zone or discharged to the sludge thickening tank via sludge return pump 82. Throughout the system, activated sludge continuously switches between anaerobic, anoxic, aerobic, anoxic, and aerobic environments. After a period of cultivation, most of the activated sludge can survive and react in different environments. Therefore, this device has strong resistance to shock loads, high organic matter removal efficiency, significant biological nitrogen and phosphorus removal effects, and stable effluent quality.

[0144] See Figure 1 As shown, an air intake system 92 is provided above the second perforated partition 12 and at the bottom of the second aerobic zone 60. (See reference...) Figure 4 As shown, the air intake system 92 includes crisscrossing pipes 921, on which microporous aerators 922 are installed. The air intake system 92 connects to the outside of the housing 10, blowing outside air to the microporous aerators 922. The outside air enters through the air intake inlet 923. This allows aeration in the second aerobic zone 60. After entering the second aerobic zone 60, the waste undergoes a contact oxidation reaction.

[0145] See Figure 1 As shown, the bottom of the coagulation zone 70 is below the liquid surface of the second aerobic zone 60. The lower part of the coagulation zone is surrounded by the liquid in the second aerobic zone 60. The coagulation zone 70 is separated from the liquid in the second aerobic zone 60 by the side wall 71 of the coagulation zone. A third perforated baffle 72 is provided at the bottom of the coagulation zone 70, through which the liquid in the second aerobic zone 60 enters the coagulation zone. The third perforated baffle 72 may be provided with an array of holes with a diameter of 25 mm to 30 mm.

[0146] See Figure 1 As shown, a guide plate 73 is provided on the inner side of the sidewall 71 of the coagulation zone for gas-liquid separation.

[0147] The inlet 131 of the connecting pipe is located near the guide plate 73, inside the side wall 71 of the coagulation zone, above the guide plate 73, and in the middle of the vertical direction of the coagulation zone 70.

[0148] The second aerobic zone 60 and the sedimentation zone 80 are separated by the side wall 66 of the second aerobic zone.

[0149] The outlet 132 of the connecting pipe is located at the upper part of the sedimentation zone 80 and on the outer side of the side wall 66 of the second aerobic zone.

[0150] Flocculants, such as polyaluminum chloride (PAC) or polyacrylamide (PAM), are added to the coagulation zone 70, thereby enabling the flocculation of suspended solids or organic matter in the water.

[0151] The bottom of the side wall 66 of the second aerobic zone is provided with an anti-pressure and anti-floating device 67. The anti-pressure and anti-floating device 67 is U-shaped and is used to prevent the side wall 66 of the second aerobic zone from floating when waste initially enters and to resist the pressure of sludge in the sedimentation zone on the side wall 66 of the second aerobic zone when the waste in the shell is emptied.

[0152] The middle part of the side wall 66 of the second aerobic zone is shaped like a platform with a large opening at the bottom and a small opening at the top. A columnar biological packing material 68 is set in the second aerobic zone, and the upper edge of the biological packing material 68 is attached to the side wall of the platform-shaped second aerobic zone.

[0153] At the height corresponding to the biological packing 68, a biological packing inspection port is provided on the shell 10.

[0154] The coagulation zone 70 is located above the biological packing material 68.

[0155] The liquid levels 69 in the second aerobic zone, 74 in the coagulation zone, and 89 in the sedimentation zone are provided at a safe distance of 300-500 mm from the top surface of the shell 10.

[0156] The mixing in the coagulation zone 70 utilizes rising air from the second aerobic zone 60. No mixing equipment is required.

[0157] See Figure 1 As shown, a collection tank 87 is provided at the upper part of the sedimentation zone 80. The collection tank 87 is located inside the shell 10, and its upper edge is located above the outlet 132 of the connecting pipe. A liquid outlet pipe 88 is provided at the bottom of the collection tank 87 to discharge the treated liquid out of the shell 10. Sludge settles downwards and enters the bottom of the annular sedimentation zone 80, while the treated liquid overflows the upper edge of the collection tank 87 and enters the collection tank 87.

[0158] See Figure 1 As shown, a sludge discharge valve 14 is provided at the bottom of the housing 10 to control the discharge of sludge from the housing 10 or to empty the housing 10.

[0159] See Figure 3 As shown, the waste inlet system 91 consists of horizontally and vertically connected pipes 911, with liquid outlets 912 having a diameter of 25mm to 30mm. Waste enters the waste inlet system 91 through the waste inlet 913 and is then dispersed into the anaerobic zone 20 within the shell 10. The waste is initially stored in the equalization tank 16.

[0160] See Figure 1As shown, the interior of the shell 10 is cylindrical. The second aerobic zone 60 is divided into three sections: the bottom section is a first cylinder 661, the middle section is a frustum 662, and the top section is a second cylinder 663. The first cylinder 661 occupies the entire interior space of the corresponding height of the shell, the frustum 662 is larger at the bottom and smaller at the top, and the diameter of the second cylinder 663 is smaller than that of the first cylinder 661. The second aerobic zone 60 has an upward-opening shape. The sedimentation zone 80 is the space enclosed by the inner side of the shell 10 and the side wall 66 of the second aerobic zone, and is an annular bucket-shaped (larger at the top and smaller at the bottom, sloping downwards) forming a sludge collection bucket. The second aerobic zone 60 and the sedimentation zone 80 are interlocked and complementary, located inside the shell.

[0161] See Figure 1 As shown, a biological packing material 68 is placed in the frustum-shaped region 662. The biological packing material 68 has a cylindrical outer contour, and its upper edge fits into a cross-sectional circle of the frustum-shaped region to ensure that all waste passes through the biological packing material 68. That is, the diameter of the biological packing material 68 is between the maximum and minimum diameters of the frustum-shaped region 662.

[0162] The coagulation zone 70 is located above the biological packing material 68. The liquid treated by the biological packing material 68 enters the coagulation zone 70.

[0163] The inlet 63 of the mixed liquor return pipe connecting the second aerobic zone 60 and the first aerobic zone 40 extends into the lower part of the frustum-shaped 662 with its opening facing upwards.

[0164] See also Figure 1 and Figure 5 As shown, a sludge return pipe 81 is connected between the sedimentation zone 80, the anaerobic zone 20, and the first anoxic zone 30. A sludge return pump 82 is installed on the sludge return pipe 81. An inlet 83 of the sludge return pipe is installed at the lower part of the sedimentation zone 80. A first dissolved oxygen meter 931 is installed near the inlet 83 at the same level.

[0165] A second dissolved oxygen meter 932 is installed at the midpoint of the radial direction of the shell, adjacent to the first aerobic zone 40 and the second anoxic zone 50.

[0166] A third dissolved oxygen meter 933 is installed in the first oxygen-deficient zone 30 near the first perforated partition 11, in the middle of the radial direction of the shell.

[0167] A fourth dissolved oxygen meter 934 is installed at the junction of the anaerobic zone 20 and the first anoxic zone 30, near the center of the shell in the radial direction.

[0168] See Figure 5 As shown, the first dissolved oxygen meter 931 is set directly against the wall of the housing 10.

[0169] See Figure 5 As shown, the second dissolved oxygen meter 932, the third dissolved oxygen meter 933, and the fourth dissolved oxygen meter 934 can be mounted on the mounting rod 935. Referring to Figure 4, mounting holes 936 for the mounting rod to pass through are provided on the first perforated partition 11 and the second perforated partition 12. The diameter of the mounting hole 936 can be set to 100 mm. To avoid passing through the coagulation zone 70, the mounting rod 935 can be positioned on the outside of the side wall 71 of the coagulation zone.

[0170] See Figure 5 As shown, the arrangement of perforations on the second perforated partition 12 is illustrated. The perforations 121 are arrayed on a flat plate, and the diameter of the perforations 121 is 25 mm to 30 mm. The first perforated partition 11 is manufactured in a similar manner to the second perforated partition 12.

[0171] A mixed liquor return pipe 61 is connected between the second aerobic zone 60 and the first aerobic zone 40, and a mixed liquor return pump 62 is installed on the mixed liquor return pipe.

[0172] An air intake pipe system 92 is provided above the second perforated partition and at the bottom of the second aerobic zone. The air intake pipe system 92 aerates air into the second aerobic zone 60 through an air intake pump 924.

[0173] The control principle of the waste treatment device provided by the present invention will be further described in detail below in conjunction with the above structural features.

[0174] By controlling the air intake pump to control the aeration rate, the dissolved oxygen concentration at the first dissolved oxygen meter 931 is controlled at the first dissolved oxygen concentration set value; the first dissolved oxygen concentration set value is 1 mg / L to 1.5 mg / L.

[0175] By controlling the flow rate of the mixed liquor reflux pump 62, the dissolved oxygen concentration at the second dissolved oxygen meter 932 is controlled at a second dissolved oxygen concentration setpoint. The second dissolved oxygen concentration setpoint is 0.6 mg / L to 0.8 mg / L. By controlling the flow rate of the mixed liquor reflux pump, the distribution ratio of the first aerobic zone 40 and the second anoxic zone 50, as well as the hydraulic residence time of waste in the first aerobic zone 40 and the second anoxic zone 50, are changed. When the flow rate of the mixed liquor reflux pump 62 is increased, the volume of the first aerobic zone 40 increases, the volume of the second anoxic zone 50 decreases, and the oxidation time is prolonged.

[0176] By controlling the flow rate of the sludge return pump 82, the dissolved oxygen concentration at the third dissolved oxygen meter 933 is controlled at the third dissolved oxygen concentration setpoint, and the dissolved oxygen concentration at the fourth dissolved oxygen meter 934 is controlled at the fourth dissolved oxygen concentration setpoint. The third and fourth dissolved oxygen concentration setpoints are between 0.2 mg / L and 0.5 mg / L. By controlling the flow rate of the sludge return pump 82, the hydraulic retention time of waste in the anaerobic zone 20 and the first anoxic zone 30 is changed.

[0177] Measurement, control, and data processing are performed using a programmable logic controller (PLC). The measurement primarily involves the dissolved oxygen concentration measured by four dissolved oxygen meters. This data is used as feedback to control the flow rates of the air intake pump, mixed liquor return pump, and sludge return pump. The pump flow rate can be varied by changing the frequency and thus the motor speed.

[0178] The waste treatment device provided by this invention, based on meeting emission standards, controls the dissolved oxygen concentration at the bottom of the sedimentation zone to 1 mg / L to 1.5 mg / L (i.e., at the first dissolved oxygen meter) by adjusting the aeration rate.

[0179] Regardless of how the dissolved oxygen varies at different locations and heights in the second aerobic zone, the dissolved oxygen level at the bottom of the sedimentation zone is between 1 mg / L and 1.5 mg / L, indicating that the aeration rate of the second aerobic zone is just slightly greater than the oxygen demand of the second aerobic zone, and the total aeration rate of the entire system is basically equal to the total oxygen demand.

[0180] The dissolved oxygen at the bottom of the sedimentation zone is 1 mg / L to 1.5 mg / L. The dissolved oxygen concentration in the first anoxic zone can be controlled at 0.2 mg / L to 0.5 mg / L (i.e., at the third and fourth dissolved oxygen meters) by adjusting the flow rate of the sludge return pump, thus creating an anoxic environment. At the same time, the returned sludge from the first anoxic zone partially sinks to the anaerobic zone under the action of gravity, forming an anaerobic environment under the action of aerobic bacteria.

[0181] The dissolved oxygen at the bottom of the sedimentation zone is 1 mg / L to 1.5 mg / L. According to experiments, the dissolved oxygen concentration in the middle of the second aerobic zone is 3 mg / L to 4 mg / L (i.e., at the inlet of the mixed liquid reflux pipe). Therefore, by adjusting the flow rate of the mixed liquid reflux pump, the dissolved oxygen concentration at the top of the first aerobic zone can be controlled at 0.6 mg / L to 0.8 mg / L (i.e., at the second dissolved oxygen meter), thus creating an aerobic environment in the first aerobic zone. At the same time, the waste from the first aerobic zone can quickly create an anoxic environment (dissolved oxygen concentration 0.2 mg / L to 0.5 mg / L) after entering the second anoxic zone.

[0182] In summary, by measuring the dissolved oxygen concentration in the sedimentation zone, the first aerobic zone, and the first anoxic zone, and using a programmable logic controller (PLC system) to precisely control the flow rates of the air intake pump, sludge return pump, and mixed liquor return pump in the air intake system, the entire system achieves an ideal operating state, thereby significantly reducing energy consumption and operating costs. Furthermore, the entire system requires no rotating equipment, further reducing energy consumption and operating costs, and requires virtually no routine maintenance. All rotating equipment (air intake pump, sludge return pump, and mixed liquor return pump) is externally mounted on the casing.

[0183] Accordingly, the hydraulic retention time of each functional zone in this invention is variable. For example, if the treatment effect indicates that the oxidation time needs to be extended for nitrification during a certain period, the flow rate of the mixed liquor return pump can be increased while keeping the total influent constant. This increases the dissolved oxygen in the first aerobic zone. Since the first aerobic zone and the second anoxic zone are in the same container (the dotted line between them is only a virtual separator), the volume of the first aerobic zone increases, and the volume of the second anoxic zone decreases, thereby changing the hydraulic retention time of different functional zones. Similarly, the flow rate of the sludge return pump can be adjusted to change the hydraulic retention time of the anaerobic zone and the first anoxic zone. Therefore, with a constant influent volume, the hydraulic retention time of each functional zone can be flexibly adjusted to achieve the desired operating effect.

[0184] See Figure 2 As shown, after passing through the anaerobic zone 20, the waste contains methane, ammonia, hydrogen sulfide, or sulfur dioxide.

[0185] After passing through the first oxygen-deficient zone 30, there is methane, ammonia, nitrogen, hydrogen sulfide, or sulfur dioxide.

[0186] After passing through the first aerobic zone 40, there is carbon dioxide, nitrogen, or some methane, ammonia, hydrogen sulfide, or sulfur dioxide.

[0187] After passing through the second anoxic zone 50, there is carbon dioxide, nitrogen, or some methane, hydrogen sulfide, or sulfur dioxide.

[0188] After passing through the second aerobic zone 60, carbon dioxide, nitrogen, nitrate, or sulfate are present. Here, carbon dioxide and nitrogen can be discharged outside the shell 10. Methane, hydrogen sulfide, ammonia, or sulfur dioxide undergo biodegradation through the biological packing material 68 in the second aerobic zone 60, thereby achieving pollution-free treatment of the waste gas.

[0189] Carbon dioxide, nitrogen, and other gases overflow from the liquid surface 69 in the second aerobic zone, the liquid surface 74 in the coagulation zone, and the liquid surface 89 in the sedimentation zone, and are discharged outside the shell 10. Nitrate or sulfate ions are present in the treated liquid.

[0190] See Figure 1 As shown, the shell 10 is erected at the ground level of the site.

[0191] See Figure 6 As shown, the shell 10 is located below the ground plane 15 of the site and above the regulating pool 16.

[0192] See Figure 7 As shown, the shell 10 is located below the ground level 15 of the site. The soft soil layer of the site is excavated to the design bearing layer, and the equipment foundation is constructed on the design bearing layer. The shell is located on the equipment foundation.

[0193] The installation plan for the shell 10 is designed based on the waste water level, site topography, and geological conditions.

[0194] Because the waste treatment device provided by this invention is a vertical device, its overall height is relatively large, which leads to a problem of high pump head. To solve this problem, this invention further provides the following solution.

[0195] Generally, the inlet elevation is low, typically 3 to 6 meters below ground level, or even deeper. Therefore, this ineffective height can be fully utilized by using the equalization tank as the foundation for the equipment, which is then installed on top of it. In this way, while keeping the effective volume of the equalization tank unchanged, both the total volume of the equalization tank and the head of the equalization tank booster pump (161) can be reduced.

[0196] If the elevation of the inlet water is high, the regulating tank can be set at a higher position, and the waste gas treatment device provided by this invention can be set at a lower position by taking advantage of the terrain. The device can be partially buried in soft soil, thereby reducing construction costs and increasing pump head.

[0197] See Figure 7 As shown, wastewater treatment plants are typically located in low-lying areas, such as depression 17. Furthermore, the geological conditions in these areas are generally poor, requiring specialized foundation treatment, which leads to high foundation costs. This terrain allows for a semi-buried installation method. The upper soft soil layer is removed to reach the designed bearing layer, then the equipment foundation is constructed, and finally, the waste treatment device provided by this invention is installed. This reduces both foundation treatment costs and the lift pump head.

[0198] By making full use of factors such as water level, topography, and geological conditions, and by comprehensively considering the plan, disadvantages can be turned into advantages, thereby achieving the goal of reducing both construction costs and energy consumption.

[0199] Therefore, the waste treatment device provided by the present invention can be applied to places with limited land, low-lying terrain, and poor geological conditions.

[0200] The waste treatment device provided by this invention is simple to maintain and manage, and can be applied to the treatment of domestic sewage in towns, factories, schools, hotels, residential communities, stations and other places.

[0201] The above are specific embodiments of the waste treatment device provided by the present invention. The present invention can achieve the following technical effects.

[0202] Small footprint: Because this device adopts a vertically stacked cylindrical layout for each functional area, it can save a significant amount of land area, saving more than 50% of land compared to traditional layouts.

[0203] Low construction cost. This device saves over 50% of land, requiring a small footprint and significantly reducing land costs. The small footprint also reduces foundation treatment costs considerably, especially in situations with limited land, complex terrain, or poor geological conditions. Only the top of each functional zone requires a 300-500mm protection height; the remaining functional zones operate at full capacity (no protection height required). This device requires very little supporting equipment (only aerators, lift pumps, sludge return pumps, and mixed liquor return pumps). Anaerobic zone, first anoxic zone, The second anoxic zone and other areas no longer require underwater mixers, the coagulation zone no longer requires agitation devices, and the first aerobic zone no longer requires aeration devices (the oxidation environment and circulation are achieved through a mixed liquor return pump under the control of a PLC system). This significantly reduces the procurement and installation costs of supporting equipment. Since the harmful gases produced in the anaerobic and anoxic tanks are degraded using a biological method, combustion devices are unnecessary, saving on the procurement and installation costs of traditional combustion devices. Energy consumption is low, and operating costs are low: because this equipment reduces a large number of devices compared to traditional processes, energy consumption is relatively low. Furthermore, the unique operation control method of this invention also significantly reduces energy consumption and lowers operating costs.

[0204] Low workload for daily maintenance and simple equipment maintenance: Since there are no rotating parts inside this equipment (device), all rotating parts are external, and the total number of supporting equipment is small, the workload for daily maintenance is low and the equipment maintenance is simple.

[0205] Harmful gases such as CH4, H2S, and NH3 generated in anaerobic and anoxic ponds are treated using a biodegradation process, achieving harmless treatment.

[0206] Site selection is relatively simple: the equipment provided by this invention occupies little space and only needs to be placed at a low location. It is particularly suitable for places with limited land, complex terrain, poor geological conditions, and other unfavorable factors.

[0207] The above specific embodiments and accompanying drawings are merely illustrative of the technical solutions and effects of the present invention, and are not intended to limit the present invention. Any person skilled in the art can modify or change the above embodiments within the scope of the claims without departing from the technical principles and spirit of the present invention, and all such modifications or changes shall fall within the scope of protection of the present invention.

Claims

1. A waste treatment device, characterized in that, It includes a shell, and the interior of the shell is divided into an anaerobic zone, a first anoxic zone, a first aerobic zone, a second anoxic zone, a second aerobic zone, a coagulation zone, and a sedimentation zone. The bottom of the anaerobic zone is equipped with a waste inlet system, and the anaerobic zone is located in the lower part of the shell; The first anoxic zone is located above the anaerobic zone, and a vortex of waste is formed in both the anaerobic zone and the first anoxic zone; The first aerobic zone is located above the first anoxic zone. A first perforated partition is provided between the first anoxic zone and the first aerobic zone. The second anoxic zone is located above the first aerobic zone. A vortex of waste is formed in the first aerobic zone and the second anoxic zone. The second aerobic zone is located above the second hypoxic zone, and a second perforated partition is provided between the second hypoxic zone and the second aerobic zone. The coagulation zone is located in the upper middle part of the second aerobic zone, and the sedimentation zone is located at the top of the shell, outside the second aerobic zone. The coagulation zone and the sedimentation zone are connected by a connecting pipe.

2. The waste treatment device according to claim 1, characterized in that, The second aerobic zone is connected to the first aerobic zone by a mixed liquor return pipe, and a mixed liquor return pump is installed on the mixed liquor return pipe. The inlet of the mixed liquor reflux pipe is located in the lower middle part of the second aerobic zone; A first nozzle is provided at the outlet of the mixed liquor reflux pipe in the first aerobic zone. The first nozzle is arranged at an angle to the horizontal plane to form a swirling flow in the first aerobic zone. The outlet of the mixed liquor reflux pipe is located at the bottom of the first aerobic zone.

3. The waste treatment device according to claim 1, characterized in that, The sedimentation zone is connected to the anaerobic zone and the first anoxic zone by a sludge return pipe, which is equipped with a sludge return pump. The inlet of the sludge return pipe is located at the bottom of the sedimentation zone; The outlet of the sludge return pipe is located at an adjacent position between the anaerobic zone and the first anoxic zone; A second nozzle is installed at the outlet of the sludge return pipe. The second nozzle is arranged at an angle to the horizontal plane to form a vortex in the anaerobic zone and the first anoxic zone. A sludge discharge valve is installed at the lowest point of the sludge return pipe to control the discharge of sludge from the sedimentation zone.

4. The waste treatment device according to claim 1, characterized in that, An air intake pipe system is installed above the second perforated partition and at the bottom of the second aerobic zone. The air intake pipe system includes horizontally and vertically interconnected pipes, and microporous aerators are installed on the pipes. The air intake pipe system is connected to the outside of the shell to blow outside air to the microporous aerators.

5. The waste treatment device according to claim 1, characterized in that, The bottom of the coagulation zone is below the liquid surface of the second aerobic zone. The lower part of the coagulation zone is surrounded by the liquid in the second aerobic zone. The coagulation zone is separated from the liquid in the second aerobic zone by the side wall of the coagulation zone. A third perforated baffle is provided at the bottom of the coagulation zone. The liquid in the second aerobic zone enters the coagulation zone through the third perforated baffle. A guide vane is installed on the inner side of the sidewall of the coagulation zone for gas-liquid separation; The inlet of the connecting pipe is located near the guide plate, inside the side wall of the coagulation zone, above the guide plate, and in the middle of the vertical direction of the coagulation zone; The second aerobic zone and the sedimentation zone are separated by the sidewall of the second aerobic zone; The outlet of the connecting pipe is located at the upper part of the sedimentation zone and on the outer side of the side wall of the second aerobic zone; Add polyaluminum chloride or polyacrylamide to the coagulation zone; The bottom of the side wall of the second aerobic zone is equipped with an anti-pressure and anti-floating device. The anti-pressure and anti-floating device is U-shaped and is used to prevent the side wall of the second aerobic zone from floating when waste initially enters and to resist the pressure of sludge in the sedimentation zone on the side wall of the second aerobic zone when the waste in the shell is emptied. The middle of the sidewall of the second aerobic zone is tiered with a large opening at the bottom and a small opening at the top. Columnar biological packing material is set in the second aerobic zone, with the upper edge of the biological packing material fitting against the tiered sidewall of the second aerobic zone. The coagulation zone is located above the biological packing material; The liquid levels in the second aerobic zone, the coagulation zone, and the sedimentation zone are provided with a safe distance of 300–500 mm from the top surface of the shell.

6. The waste treatment device according to claim 1, characterized in that, A collection tank is provided at the top of the sedimentation zone; The liquid collection tank is located inside the shell, and the upper edge of the liquid collection tank is located above the outlet of the connecting pipe; A liquid outlet pipe is provided at the bottom of the liquid collection tank to discharge the treated liquid out of the shell; A perforated sludge collection pipe is installed at the bottom of the sedimentation zone, and the perforated sludge collection pipe is connected to the sludge return pipe.

7. The waste treatment device according to claim 1, characterized in that, A sludge discharge valve is installed at the bottom of the shell to control the discharge of sludge from the shell or to empty the shell.

8. The waste treatment device according to claim 1, characterized in that, The waste inlet system consists of horizontally and vertically connected pipes, with liquid outlets on the pipes, the diameter of which is 25mm to 30mm.

9. The waste treatment device according to claim 1, characterized in that, The interior of the shell is cylindrical; The second aerobic zone is divided into three sections: the bottom section is a first cylindrical shape, the middle section is a frustum shape, and the top section is a second cylindrical shape. The first cylinder occupies the entire internal space of the shell at the corresponding height. The frustum shape is larger at the bottom and smaller at the top. The diameter of the second cylinder is smaller than that of the first cylinder. The sedimentation zone is the space enclosed by the inner side of the shell and the side wall of the second aerobic zone. It is an annular bucket-shaped structure that forms a mud collection bucket. Biological packing material is placed in the frustum-shaped area. The outer contour of the biological packing material is cylindrical, and the upper edge of the biological packing material is in contact with a cross-sectional circle of the frustum-shaped area to ensure that all waste passes through the biological packing material. The coagulation zone is located above the biological packing material; The inlet of the mixed liquor reflux pipe connecting the second aerobic zone and the first aerobic zone extends into the lower part of the frustum shape, with the opening facing upwards.

10. The waste treatment device according to claim 1, characterized in that, A sludge return pipe is connected between the sedimentation zone and the anaerobic zone and the first anoxic zone. A sludge return pump is installed on the sludge return pipe. The inlet of the sludge return pipe is located at the lower part of the sedimentation zone. A first dissolved oxygen meter is installed near the inlet of the sludge return pipe at the same level. A second dissolved oxygen meter is installed at the midpoint of the radial direction of the shell, adjacent to the first aerobic zone and the second anoxic zone. A third dissolved oxygen meter is installed in the first anoxic zone near the first perforated partition and in the middle of the radial direction of the shell. A fourth dissolved oxygen meter is installed at the junction of the anaerobic zone and the first anoxic zone, near the center of the shell in the radial direction. A mixed liquor return pipe is connected between the second aerobic zone and the first aerobic zone, and a mixed liquor return pump is installed on the mixed liquor return pipe; An air intake pipe system is installed above the second perforated partition and at the bottom of the second aerobic zone. The air intake pipe system aerates air into the second aerobic zone through an air intake pump. The aeration rate is controlled by controlling the air intake pump, so that the dissolved oxygen concentration at the first dissolved oxygen meter is controlled at the first dissolved oxygen concentration set value; the first dissolved oxygen concentration set value is 1 mg / L to 1.5 mg / L. By controlling the flow rate of the mixed liquor reflux pump, the dissolved oxygen concentration at the second dissolved oxygen meter is controlled at the second dissolved oxygen concentration set value; and by controlling the flow rate of the mixed liquor reflux pump, the distribution ratio of the first aerobic zone and the second anoxic zone and the hydraulic residence time of waste in the first aerobic zone and the second anoxic zone are changed. When the flow rate of the mixed liquor reflux pump is increased, the volume of the first aerobic zone increases, the volume of the second anoxic zone decreases, and the oxidation time is prolonged; the second dissolved oxygen concentration is set to 0.6 mg / L to 0.8 mg / L. By controlling the flow rate of the sludge return pump, the dissolved oxygen concentration at the third dissolved oxygen meter is controlled at the third dissolved oxygen concentration setpoint, and the dissolved oxygen concentration at the fourth dissolved oxygen meter is controlled at the fourth dissolved oxygen concentration setpoint; furthermore, by controlling the flow rate of the sludge return pump, the hydraulic retention time of waste in the anaerobic zone and the first anoxic zone is changed; the third and fourth dissolved oxygen concentration setpoints are 0.2 mg / L to 0.5 mg / L. Measurement, control, and data processing are performed using a programmable logic controller (PLC).

11. The waste treatment device according to claim 1, characterized in that, After passing through the anaerobic zone, the waste contains methane, ammonia, hydrogen sulfide, or sulfur dioxide. After passing through the first oxygen-deficient zone, there is methane, ammonia, nitrogen, hydrogen sulfide, or sulfur dioxide. After passing through the first aerobic zone, there is carbon dioxide, nitrogen, or some methane, ammonia, hydrogen sulfide, or sulfur dioxide; After passing through the second anoxic zone, there is carbon dioxide, nitrogen, or some methane, hydrogen sulfide, or sulfur dioxide. After passing through the second aerobic zone, there are carbon dioxide, nitrogen, nitrate, or sulfate ions; Carbon dioxide and nitrogen gases overflow from above the liquid surface in the second aerobic zone, the coagulation zone, or the sedimentation zone, and are discharged outside the shell.

12. The waste treatment apparatus according to any one of claims 1 to 11, characterized in that, The shell is mounted on the ground level of the site; or... The shell is located below the ground level of the site and above the regulating tank; or, The shell is located below the site's ground level. The soft soil layer is excavated down to the designed bearing layer, and the equipment foundation is constructed on this layer. The shell rests on the equipment foundation. Alternatively, The installation plan for the shell is designed based on the water level of the waste, the topography and geological conditions of the site.

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