CN212174582U - Two-stage AO integrated sewage treatment equipment - Google Patents

Abstract

The utility model discloses a two-stage AO integration sewage treatment device, including first processing unit, second processing unit, precipitation unit and mud reflux unit. The first treatment unit comprises a first anoxic tank and a first aerobic tank, and the first aerobic tank is positioned at the downstream of the first anoxic tank; the second treatment unit is positioned at the downstream of the first treatment unit and comprises a second anoxic tank and a second aerobic tank, and the second aerobic tank is positioned at the downstream of the second anoxic tank; the sedimentation unit is positioned at the downstream of the second treatment unit; the sludge reflux device comprises a reflux pipe which extends into the first aerobic tank from the sedimentation unit, and the sedimentation unit is communicated with the first aerobic tank through the sludge reflux device; one of the first treatment unit and the second treatment unit is internally provided with suspended fillers, and the other one of the first treatment unit and the second treatment unit is internally provided with fixed fillers. According to the two-stage AO integrated sewage treatment equipment of the utility model, the cost can be reduced by adopting a composite process; the sludge is refluxed to the first aerobic tank, so that the denitrification efficiency can be improved.

Description

Two-stage AO integrated sewage treatment equipment

Technical Field

The utility model relates to a water treatment technical field particularly relates to a two-stage AO integration sewage treatment device.

Background

In recent years, with the national emphasis on rural sewage treatment in villages and towns, a large number of processes and integrated treatment equipment for rural domestic sewage treatment are emerging continuously. At present, the integrated sewage treatment equipment is mostly manufactured by adopting containers, and the common treatment processes are an MBBR (Moving-Bed Biofilm Reactor) process, an MBR (Membrane bioreactor) process, a biological contact oxidation process and the like.

Because the MBBR technology has the advantages of both the traditional fluidized bed and the biological contact oxidation method, the suspended filler serving as the core of the MBBR technology can be suspended in water along with aeration or stirring because a fixed support is not needed, and the denitrification effect is good, so that the MBBR technology is widely applied to sewage treatment. However, the price of the suspension filler is higher at present, and under the same filling rate, the cost of using the suspension filler is about 5 times of that of the fixed filler, so that the use cost is greatly increased.

In addition, in the traditional AO (Anoxic/Oxic, Anoxic/aerobic) -MBBR (moving bed biofilm reactor) water treatment process, the dissolved oxygen in an Anoxic tank is increased due to the return flow step of nitrifying liquid and sludge, and the denitrification efficiency is reduced.

Therefore, there is a need for a two-stage AO integrated sewage treatment plant to at least partially solve the above problems.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content does not imply any attempt to define the essential features and essential features of the claimed solution, nor is it implied to be intended to define the scope of the claimed solution.

For at least partially solving the problem, the utility model provides a two-stage AO integration sewage treatment device, include:

a first treatment unit comprising a first anoxic tank and a first aerobic tank, the first aerobic tank being located downstream of the first anoxic tank;

a second treatment unit located downstream of the first treatment unit, the second treatment unit comprising a second anoxic tank and a second aerobic tank, the second aerobic tank being located downstream of the second anoxic tank;

a precipitation unit located downstream of the second treatment unit; and

a sludge recirculation apparatus comprising a recirculation pipe extending from the sedimentation unit into the first aerobic tank, the sedimentation unit being in communication with the first aerobic tank via the sludge recirculation apparatus;

wherein, the inside of one of the first processing unit and the second processing unit is provided with a suspension filler, and the inside of the other one is provided with a fixed filler.

According to the two-stage AO integrated sewage treatment equipment of the utility model, the cost is reduced while good denitrification effect is obtained by adopting a mode of combining two processes; in addition, with mud from the sedimentation unit backward flow to first good oxygen pond, can avoid the dissolved oxygen in the mud to get into the oxygen deficiency pond, avoid causing the influence to the denitrifying bacteria, effectively improved denitrogenation efficiency.

Further, the two-stage AO integrated sewage treatment apparatus further comprises a first reflux device, the first reflux device comprises a first draft tube extending from the second anoxic tank into the first anoxic tank, and the second anoxic tank is communicated with the first anoxic tank through the first reflux device.

Further, the two-stage AO integrated sewage treatment device further comprises a second reflux device, the second reflux device comprises a second flow guide pipe extending from the second aerobic tank into the second anoxic tank, and the second aerobic tank is communicated with the second anoxic tank through the second reflux device.

Further, the first reflux unit and/or the second reflux unit are configured as a stripping reflux unit.

Further, a suspended filler intercepting device is arranged between the first treatment unit and the second treatment unit.

Further, the two-stage AO integrated sewage treatment device still includes the inlet tube, the inlet tube with first oxygen deficiency pond and second oxygen deficiency pond all communicates.

Furthermore, aeration devices are arranged in the first aerobic tank and the second aerobic tank, and intermittent stirring devices are arranged in the first anoxic tank and the second anoxic tank.

Further, the two-stage AO integrated sewage treatment apparatus further comprises an auxiliary unit for supplying sewage to the first and second treatment units and receiving treated water from the precipitation unit, the auxiliary unit having an auxiliary device therein.

Furthermore, a fixed filler is arranged in the first treatment unit, a suspended filler is arranged in the second treatment unit, the two-stage AO integrated sewage treatment equipment further comprises a water passing device, and the second anoxic tank and the second aerobic tank are communicated through the water passing device.

Optionally, a fixed filler is arranged in the second treatment unit, a suspended filler is arranged in the first treatment unit, the two-stage AO integrated sewage treatment equipment further comprises a water passing device, and the first anoxic tank and the first aerobic tank are communicated through the water passing device.

Further, the two-stage AO integrated sewage treatment device comprises a container.

Drawings

The following drawings of the present invention are used herein as part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions of the invention, which are used to explain the principles of the invention.

In the drawings:

FIG. 1 is a schematic structural view of a two-stage AO integrated sewage treatment apparatus according to a preferred embodiment of the present invention;

FIG. 2 is a sectional schematic view of the two-stage AO integrated sewage treatment apparatus of FIG. 1;

FIG. 3 is a schematic process flow diagram according to a first preferred embodiment of the present invention;

FIG. 4 is a schematic process flow diagram according to a second preferred embodiment of the present invention;

FIG. 5 is a schematic structural diagram of the first reflow apparatus in FIG. 2;

FIG. 6 is a schematic structural view of the water passing device in FIG. 2;

FIG. 7 is a schematic view of the suspended filler intercepting apparatus of FIG. 2;

FIG. 8 is a schematic right view of the suspended charge intercepting apparatus of FIG. 7;

FIG. 9 is a schematic view of the weir of FIG. 2; and

FIG. 10 is a schematic top view of the weir of FIG. 9.

Description of reference numerals:

100: two-stage AO integrated sewage treatment plant 110: a first processing unit

111: the first anoxic tank 112: the first aerobic tank

113: the aeration device 114: intermittent stirring device

120: the second processing unit 121: second anoxic tank

122: the second aerobic tank 123: wall panel

124: the partition 125: vertical plate

130: the precipitation unit 131: mud bucket

132: the effluent weir 133: weir plate

134: slag trap 135: reinforcing rib

136: fixing bracket 137: water outlet

138: bottom plate 140: auxiliary unit

141: water inlet pipe 150: sludge reflux device

151: return pipe 152: mud collecting groove

153: sludge riser 154: gas delivery pipe

160: first reflux unit 161: first flow guide pipe

162: first sump 163: first riser

164: first intake pipe 165: first suspended filler blocking device

170: second reflux unit 171: second flow guide pipe

172: second sump 173: second riser

174: second intake pipe 175: second suspended filler blocking device

176: opening a hole 180: suspended filler intercepting device

181: the body portion 182: top board

183: the inclined plate 184: side plate

185: connecting portion 186: perforation

190: water passing device 191: first vertical tube

192: second standpipe 193: horizontal pipe

194: suspended filler blocking device 195: through hole

196: an upper pipe 197: lower pipe

198: bent pipe

Detailed Description

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

In the following description, a detailed description will be given for a thorough understanding of the present invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, however, other embodiments of the present invention are possible in addition to these detailed descriptions.

It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Ordinal words such as "first" and "second" are referred to in this application as labels only, and do not have any other meanings, such as a particular order, etc. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component".

It is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used herein for purposes of illustration only and are not limiting.

Exemplary embodiments according to the present invention 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 only the embodiments set forth herein. It is to be understood 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.

Fig. 1 and 2 show a two-stage AO integrated sewage treatment apparatus of a preferred embodiment of the present invention. The two-stage AO integrated sewage treatment plant 100 is configured as a container, which includes a first treatment unit 110, a second treatment unit 120, a precipitation unit 130 and an auxiliary unit 140. The second treating unit 120 is located downstream of the first treating unit 110, and the precipitating unit 130 is located downstream of the second treating unit 120. The auxiliary unit 140 is constructed as a plant room, located at the end of the container. In the illustrated embodiment, the inter-apparatus location is located laterally of the precipitation unit 130 and spaced apart from the precipitation unit 130. The auxiliary unit 140 is used for storing various raw materials such as auxiliary devices (water supply devices, water discharge devices, or air supply devices such as air compressors or fans), medicines, and carbon sources.

Wherein, the water treatment processes adopted by the first treatment unit 110 and the second treatment unit 120 are different. For example, one of the first and second treatment units 110 and 120 may employ an AO-bio contact oxidation process and the other may employ an AO-MBBR process. That is, one of the first and second treating units 110 and 120 has a floating packing disposed therein, and the other has a fixed packing disposed therein.

As shown in fig. 3, according to a first preferred embodiment of the present invention, a fixed filler is disposed in the first processing unit 110, and a suspended filler is disposed in the second processing unit 120. In a second preferred embodiment of the present invention shown in fig. 4, the first processing unit 110 is filled with a suspension filler, and the second processing unit 120 is filled with a fixed filler.

In order to keep the suspended filler in a suspended state all the time or to keep the sewage in the treatment tank in a flowing state, the first aerobic tank 112 and the second aerobic tank 122 are both provided with aeration devices 113, and the first anoxic tank 111 and the second anoxic tank 121 are both provided with intermittent stirring devices 114. The intermittent stirring device 114 is preferably a submersible stirrer.

The intermittent stirring can reduce the dissolution of oxygen, so that the dissolved oxygen content of the first anoxic tank 111 and the second anoxic tank 121 is kept at 0.2-0.5 mg/L. In order to prevent the suspended fillers from being crushed by the agitator and causing the loss of the fillers, the outside of the intermittent stirring device 114 may be covered with an intercepting net (not shown).

The aeration device 113 in the first aerobic tank 112 is preferably a microporous aeration pipe or a microporous aeration disk, so that the dissolved oxygen content of the first aerobic tank 112 is kept at 2.0-3.0 mg/L. The aeration device 113 in the second aerobic tank 122 is preferably a large bubble aerator, so that the dissolved oxygen content in the second aerobic tank 122 is kept at 1.5-2.0 mg/L. The device is more suitable for the growth requirements of microorganisms in each pool, and can improve the sludge concentration.

Specifically, referring back to fig. 2, the first treatment unit 110 includes a first anoxic tank 111 and a first aerobic tank 112, and the second treatment unit 120 includes a second anoxic tank 121 and a second aerobic tank 122. The positional relationship of the treatment tanks is as follows: the first aerobic tank 112 is located downstream of the first anoxic tank 111, the second anoxic tank 121 is located downstream of the first aerobic tank 112, the second aerobic tank 122 is located downstream of the second anoxic tank 121, and the sedimentation unit 130 is located downstream of the second aerobic tank 122.

Referring to fig. 2, 3 and 4, in order to improve the denitrification efficiency, the sludge in the sedimentation unit 130 is returned to replenish the microorganisms in the sludge to the treatment tank. For this purpose, the two-stage AO integrated sewage treatment plant 100 further comprises a sludge recirculation device 150, and the sedimentation unit 130 is in communication with the first aerobic tank 112 via the sludge recirculation device 150.

The sludge returning apparatus 150 includes a sludge collecting tank 152, a sludge lifting pipe 153, a return pipe 151, and a gas pipe 154. The sludge collection tank 152 and the sludge lift pipe 153 are located in the settling unit 130. One end of the return pipe 151 is communicated with the sludge collection tank 152, and the other end extends into the first aerobic tank 112. The top end of the sludge lifting pipe 153 is communicated with the sludge collecting groove 152, and the bottom end extends into the hopper 131. One end of the gas pipe 154 is connected with a gas supply device, and the other end is communicated with the sludge lifting pipe 153, and the communication position is positioned below the liquid level.

Therefore, the dissolved oxygen in the sludge does not enter the first anoxic tank 111, and further does not affect the denitrifying bacteria in the first anoxic tank 111.

According to the two-stage AO integrated sewage treatment equipment of the utility model, the cost is reduced while good denitrification effect is obtained by adopting a mode of combining two processes; in addition, with mud from the sedimentation unit backward flow to first good oxygen pond, can avoid the dissolved oxygen in the mud to get into the oxygen deficiency pond, avoid causing the influence to the denitrifying bacteria, effectively improved denitrogenation efficiency.

Because the anoxic link is arranged in front in order to save carbon sources and improve the denitrification efficiency in the A/O process, the nitrification liquid generated in the aerobic link needs to be returned to the anoxic link for denitrification.

Please continue with fig. 2, 3 and 4. The two-stage AO integrated sewage treatment plant 100 further includes a first reflux unit 160, and a second reflux unit 170.

The second reflux device 170 is mainly used in the second treatment unit 120, and is configured to reflux the nitrified liquid in the second aerobic tank 122 to the second anoxic tank 121. The first treatment unit 110 is located at the front end of the two-stage AO integrated sewage treatment plant 100, the dissolved oxygen content in the first aerobic tank 112 is maintained at 2.0-3.0 mg/L, and the oxygen content is higher than 1.5-2.0 mg/L of the second aerobic tank 122, so that it is not suitable to directly return the nitrified liquid in the first aerobic tank 112 to the first anoxic tank 111.

Therefore, the utility model discloses in first reflux unit 160 will flow into the second oxygen deficiency pond 121 from first good oxygen pond 112 and the liquid of fully nitrifying that does not react flows back to first oxygen deficiency pond 111, can avoid the dissolved oxygen in first good oxygen pond 112 to get into first oxygen deficiency pond 111 in a large number like this to can improve denitrogenation efficiency.

Specifically, structure of the first flow back device 160 referring to fig. 2, the first flow back device 160 includes a first sump 162, a first riser pipe 163, a first flow guide pipe 161, and a first inlet pipe 164. Wherein the first riser 163 and the first draft tube 161 are located within the second anoxic tank 121. One end of the first draft tube 161 is communicated with the first sump 162, and the other end thereof extends into the first anoxic tank 111. The first riser pipe 163 is located below the first sump 162, and has a top end communicating with the first sump 162 and a bottom end communicating with the second anoxic tank 121. One end of the first intake pipe 164 communicates with the first riser pipe 163, and the other end communicates with the gas supply device. Thus, the second anoxic tank 121 communicates with the first anoxic tank 111 via the first reflux device 160.

Most of the first riser pipe 163 is located below the surface of the sewage, and the first sump 162 and the first draft pipe 161 are located above the surface of the sewage. Air from the air supply enters the first riser pipe 163 through the first air inlet pipe 164 and forms an air/water mixture with the liquid in the first riser pipe 163 such that the density of the liquid in the pipe rises less than that outside the pipe.

Please refer to fig. 5 for a detailed structure of the second reflow apparatus 170. The second reflux unit 170 includes a second sump 172, a second riser 173, a second draft tube 171, and a second intake pipe 174. Wherein the second riser 173 and the second draft tube 171 are located in the second aerobic tank 122. One end of the second flow guide tube 171 is communicated with the second liquid collecting tank 172, and the other end extends into the second anoxic tank 121. The second riser pipe 173 is located below the second header tank 172, and has a top end communicating with the second header tank 172 and a bottom end communicating with the second aerobic tank 122. One end of the second inlet pipe 174 communicates with the second riser pipe 173, and the other end communicates with the gas supply device.

Preferably, the first reflux unit 160 and/or the second reflux unit 170 are configured as a stripping reflux unit. When the floating packing is charged into the second treatment unit 120, a first floating packing blocking device 165 is provided at the bottom of the first riser pipe 163, and a second floating packing blocking device 175 is provided at the bottom of the second riser pipe 173, in order to prevent clogging. A plurality of openings 176 are provided in each of the first 165 and second 175 suspended charge barriers. The suspended packing baffle is generally configured as an inverted square pyramid with the top surface having a larger area than the bottom surface, which reduces the likelihood of suspended packing buildup. With the top and bottom surfaces closed and the opening 176 provided on the side surface. The suspended filler block is preferably connected to the bottom end of the riser by rivets.

Further, in order to prevent the suspended filler in the treatment tank from running off, the two-stage AO integrated sewage treatment apparatus 100 further includes a suspended filler intercepting device 180. Specifically, when the fixed filler is arranged in the first treatment unit 110, the suspended filler intercepting device 180 is arranged on a vertical plate 125 (shown in fig. 1) between the first aerobic tank 112 and the second anoxic tank 121, and covers a water passing opening on the vertical plate 125; and the suspended filler intercepting device 180 is arranged on a wall plate 123 (shown in figure 1) between the second aerobic tank 122 and the sedimentation unit 130, and covers a water passing opening on the wall plate 123.

The detailed structure of the suspended filler intercepting apparatus 180 is shown in fig. 7 and 8. The floating filler intercepting apparatus 180 includes a body portion 181 and a connection portion 185. The body portion 181 is configured as an open-sided triangular prism including a top plate 182, an inclined plate 183, and two side plates 184. The top plate 182 and the inclined plate 183 are configured as both side surfaces of a triangular prism, the two side plates 184 are configured as top or bottom surfaces of the triangular prism, a plurality of perforation holes 186 are provided on the side plates 184, and the side surfaces of the floating packing intercepting means 180 are opened toward the water passing port. A connection portion 185 is provided at an edge of the side opening for fixing the body portion 181 to the container. Accordingly, the side plate 184 having the through hole 186 is provided obliquely toward the water surface, and the accumulation of the floating packing can be prevented.

To further prevent the loss of the suspended solids in the treatment tank, refer to fig. 2 and 6. The two-stage AO integrated sewage treatment plant 100 further comprises a water passing device 190, the water passing device 190 being substantially configured as an H-shape comprising a first standpipe 191, a second standpipe 192 and a cross-pipe 193, the first standpipe 191 communicating with the second standpipe 192 via the cross-pipe 193. As shown in fig. 2, when the suspended filler is fed into the second treatment unit 120, the first vertical pipe 191 is located in the second anoxic tank 121, the second vertical pipe 192 is located in the second aerobic tank 122, and the horizontal pipe 193 passes through the partition 124 (shown in fig. 1) in the second anoxic tank 121 and the second aerobic tank 122. The top ends of the first and second risers 191 and 192 of the water passing device 190 are open for discharging gas from the water. And the bottoms of both the first and second risers 191 and 192 are provided with suspended packing retention devices 194. Therefore, the second anoxic tank 121 is communicated with the second aerobic tank 122 through the water passing device 190, and the water passing device 190 is used for conveying the sewage after the anoxic link reaction to the aerobic link.

It is easily understood that, when the suspended filler is put into the first treatment unit 110, the first anoxic tank 111 and the first aerobic tank 112 need to be communicated with each other through a water passing device in order to prevent the suspended filler from being lost.

The floating packing blocking means 194 is constructed in a column shape with a closed bottom surface, and is provided at a side surface thereof with a plurality of through holes 195 so as to block the floating packing while passing the sewage. The floating packing stop 194 is preferably attached to the standpipe by rivets.

Furthermore, due to the small volume of the second anoxic tank 121 and the second aerobic tank 122 in the illustrated embodiment, in order to prevent sewage from the first treatment unit 110 from entering the second aerobic tank 122 without reacting sufficiently in the second anoxic tank 121, at least a portion of the first standpipe 191 and/or the second standpipe 192 may be disposed adjacent to the partition 124 (shown in fig. 2). Taking the first standpipe 191 as an example, the first standpipe 191 includes an upper pipe 196, a lower pipe 197, and an elbow 198, and the upper pipe 196 and the lower pipe 197 communicate via the elbow 198. The curved portion of the elbow 198 is inclined toward the direction of the diaphragm 124. Thus, lower tubes 197 are closer to the bulkhead 124 than upper tubes 196. The second standpipe 192 is similar in structure to the first standpipe 191 and will not be described in detail herein.

Please refer back to fig. 2, 9 and 10. An effluent weir 132 is provided in the settling unit 130, the effluent weir 132 being detachably provided in the settling unit 130 for discharging the treated water out of the settling unit 130.

The water outlet weir 132 is composed of a weir plate 133, a slag trap 134, a fixing bracket 136, a reinforcing rib 135, a bottom plate 138, a water outlet 137 and the like. The four slag baffles 134 and the one base plate 138 substantially enclose a rectangular parallelepiped weir body, and the two weir plates 133 are vertically disposed inside the weir body and spaced apart from each other. In addition, the weir plate 133 is also spaced apart from the slag trap 134. The reinforcing bars 135 are connected between the two weir plates 133. The weir plate 133 is preferably a triangular weir plate 133.

The water outlet 137 is provided on the bottom plate 138, and the end thereof is connected to the water outlet pipe of the two-stage AO integrated sewage treatment apparatus 100 via a hose so that the treated water can be discharged outside the container. In an alternative embodiment, the outlet pipe extends into the auxiliary unit 140 and discharges the two-stage AO integrated sewage treatment plant 100 via a drainage means within the auxiliary unit 140.

The fixing brackets 136 are located at the four corners of the weir body and have waist holes thereon. The mounting bracket 136 is bolted to the weir 132. When the weir 132 is installed, the level of the weir 132 can be adjusted by adjusting the position and length of the bolts on each of the fixing brackets 136.

In addition, the auxiliary unit 140 may further include a water supply device for supplying the sewage to the first and second treatment units 110 and 120. The water inlet pipe 141 extends from the water supply device to the outside of the auxiliary unit 140, is communicated with both the first anoxic tank 111 and the second anoxic tank 121, and simultaneously supplies water to the first anoxic tank and the second anoxic tank 121 at multiple points.

After passing through the first treatment unit 110, most of the organic matters in the sewage are decomposed, and the content of the organic matters in the sewage entering the second anoxic tank 121 is very low, so that the content of the organic matters in the second anoxic tank can be increased by multipoint water feeding, thereby ensuring the occurrence of denitrification reaction, reducing the additional carbon source and lowering the cost.

In addition, the shape and size of the through holes 195 of the floating packing stop 194, the perforations 186 of the floating packing stop 180, the openings 176 of the floating packing stop, and the holes on the stop screen may be different according to the shape of the floating packing to be thrown, such as circular, rectangular, kidney-shaped, or bar-shaped. The size of the holes is smaller than the minimum external dimension of the suspended filler. To prevent clogging of the sludge while ensuring water throughput, the size of the holes needs to be moderate.

Furthermore, the total number of holes (n) needs to be determined by rounding the quotient of the total water passing area (a) divided by the individual hole area (a). The total water passing area (A) needs to be calculated according to the water passing flow (Q) and the water passing flow velocity (v), and a safety factor (k, generally 1.2-1.5) is multiplied to ensure that water passing is not influenced when the hole part is blocked. Wherein the flow rate (Q) of the water passing is the reflux water amount actually required, and the flow rate (v) of the water passing can be 0.7-1.2 m/s. Wherein, when the number of the through holes 195 on the water passing device 190 is calculated, the water passing flow rate (Q) is the sum of the water inlet amount and the backflow flow rate.

The calculation formula is as follows:

A＝k*(Q/v)

n＝A/a

in an alternative embodiment, the suspended filler introduced into the treatment tank may be a cubic polyurethane filler having a size of 20mm × 20mm × 20mm, and the shape of the hole may be a kidney-shaped hole having a size of 10mm × 50 mm.

After the size of the holes and the total number of the holes are determined, the distance between the holes is determined according to the requirements of the material and the strength of the suspended filler blocking device, the suspended filler blocking device 194 and the suspended filler intercepting device 180, the conditions of the existing production equipment, and the like, and then the number of the holes on the side and the area of the side are calculated, so that the overall size of the suspended filler blocking device, the suspended filler blocking device 194 and the suspended filler intercepting device 180 is determined. The suspended filler blocking device, the suspended filler blocking device 194 and the suspended filler blocking device 180 can be made of stainless steel, polypropylene and other materials with high corrosion resistance. In a preferred embodiment, the suspended filler damming device 194 and the suspended filler damming device 180 are made of stainless steel.

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 invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many more modifications and variations are possible in light of the teaching of the present invention and are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (11)

1. A two-stage AO integrated sewage treatment apparatus, comprising:

a first treatment unit comprising a first anoxic tank and a first aerobic tank, the first aerobic tank being located downstream of the first anoxic tank;

a second treatment unit located downstream of the first treatment unit, the second treatment unit comprising a second anoxic tank and a second aerobic tank, the second aerobic tank being located downstream of the second anoxic tank;

a precipitation unit located downstream of the second treatment unit; and

a sludge recirculation apparatus comprising a recirculation pipe extending from the sedimentation unit into the first aerobic tank, the sedimentation unit being in communication with the first aerobic tank via the sludge recirculation apparatus;

wherein, the inside of one of the first processing unit and the second processing unit is provided with a suspension filler, and the inside of the other one is provided with a fixed filler.

2. The two-stage AO integrated sewage treatment plant of claim 1 further comprising a first flow back device comprising a first flow guide extending from the second anoxic tank into the first anoxic tank, the second anoxic tank being in communication with the first anoxic tank via the first flow back device.

3. The two-stage AO integrated sewage treatment plant of claim 2 further comprising a second recirculation device comprising a second draft tube extending from the second aerobic tank into the second anoxic tank, the second aerobic tank communicating with the second anoxic tank via the second recirculation device.

4. The two-stage AO integrated sewage treatment plant of claim 3, wherein the first reflux device and/or the second reflux device is configured as a gas stripping reflux device.

5. The two-stage AO integrated sewage treatment plant of claim 1 wherein there is a suspended filler intercepting device between the first treatment unit and the second treatment unit.

6. The two stage AO integrated sewage treatment plant of claim 1 further comprising a water inlet pipe in communication with both the first anoxic tank and the second anoxic tank.

7. The two-stage AO integrated sewage treatment plant according to claim 1 wherein an aeration device is provided in each of said first aerobic tank and said second aerobic tank and an intermittent stirring device is provided in each of said first anoxic tank and said second anoxic tank.

8. The two-stage AO integrated sewage treatment plant of claim 1 further comprising an auxiliary unit for feeding sewage to said first and second treatment units and receiving treated water from said precipitation unit, said auxiliary unit having auxiliary means therein.

9. The two-stage AO integrated sewage treatment plant according to claim 1 wherein a fixed packing is provided in the first treatment unit and a suspended packing is provided in the second treatment unit, the two-stage AO integrated sewage treatment plant further comprising a water passing device, the second anoxic tank and the second aerobic tank being in communication via the water passing device.

10. The two-stage AO integrated sewage treatment plant according to claim 1 wherein a fixed packing is provided in the second treatment unit and a suspended packing is provided in the first treatment unit, the two-stage AO integrated sewage treatment plant further comprising a water passing device, the first anoxic tank and the first aerobic tank being in communication via the water passing device.

11. A two-stage AO-integrated sewage treatment plant according to any of the claims 1-10 comprising a container.

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