CN212770310U - Garden domestic sewage treatment system - Google Patents

Abstract

The utility model discloses a garden domestic sewage treatment system, including biochemical pond, subsider and filter equipment, the liquid outlet and the inlet of subsider of biochemical pond are connected, and the overflow mouth and the inlet of filter equipment of subsider are connected, and the connection air supply pipe has been laid to the bottom in biochemical pond, is connected with the leap up and moves air shower nozzle on the air supply pipe, and filter equipment detachably is equipped with the filter bag. The utility model has the advantages that: the air that lets in biochemical pond is through leaping up the air shower nozzle blowout, stirs the water around the air shower nozzle better to improve the mixed effect of air and water, promote the digestion of microorganism, the sewage after the digestion gets into the sedimentation tank and deposits, and the upper overflow liquid that contains the solid matter gets into filter equipment and filters, and the solid matter is collected as the agricultural fertilizer that has economic value by the filter bag, and the filtrate is discharged up to standard.

Description

Garden domestic sewage treatment system

Technical Field

The utility model belongs to sewage treatment facility field, concretely relates to garden domestic sewage treatment system.

Background

The general process of domestic sewage treatment is that firstly, the domestic sewage is digested in a biochemical reaction tank, then the domestic sewage enters a settling tank for precipitation, and overflow liquid on the upper layer of the settling tank is filtered and discharged after reaching the standard. The sediment and the filter residue often contain a certain amount of N, P and other elements, and have certain fertilizer efficiency. Therefore, the method comprehensively considers the environmental protection and economic benefits, collects the precipitate, uses a filter device to separate out solid matters in the overflow liquid, and has economic and environmental protection values when being used as agricultural fertilizers. The treatment efficiency of the whole sewage treatment system is determined by the efficiency of the digestion tank and the filtration efficiency. The digestion function in the reaction tank depends on the digestion reaction sufficiency of organic matters, and some existing digestion tanks are integrated with a pump gas, a stirring and detecting device and other highly automated devices, so that the better digestion effect is achieved, but the problems of complex structure and high cost are caused, and the digestion tank is not suitable for a domestic sewage treatment system in a chemical industry park scale. In addition, the existing filtering device has the problems of complex structure, inconvenient filter bag replacement and the like, and limits the filtering efficiency. Therefore, in the case where the cost of the apparatus is limited, it is a challenge to optimize the structural design of each device as much as possible to improve the processing efficiency.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a garden domestic sewage treatment system.

The technical scheme is as follows:

a system for treating domestic sewage in a park comprises a biochemical tank, a settling tank and a filtering device, wherein a liquid outlet of the biochemical tank is connected with a liquid inlet of the settling tank, an overflow port is arranged at the upper part of the settling tank and is connected with a liquid inlet of the filtering device, and the key point is that,

an air supply pipe is laid at the bottom of the biochemical pool and is connected with at least one leaping air nozzle;

the filtering device comprises a filter vat with an opening at the upper part, a vat cover is buckled on the opening of the filter vat, a locking mechanism is arranged between the vat cover and the filter vat, a liquid inlet pipe is arranged at the upper part of the wall of the filter vat, the liquid inlet pipe is connected with the overflow port, and a liquid outlet pipe is arranged at the bottom of the filter vat;

the filter barrel is detachably provided with a filter bag.

By adopting the design, the air introduced into the biochemical pool is sprayed out through the leaping air nozzles, the water around the leaping air nozzles is better stirred, so that the mixing effect of the air and the water is improved, the digestion effect of microorganisms is promoted, the digested sewage enters the sedimentation tank for sedimentation, the upper overflow liquid containing solid matters enters the filtering device for filtering, the solid matters are collected by the filter bag to be used as agricultural fertilizer with economic value, and the filtrate is discharged after reaching the standard.

As a preferred technical scheme, the leap air nozzle comprises a spray pipe provided with spray holes and an air buffer chamber, the spray pipe is movably arranged on the wall of the air buffer chamber in a penetrating manner, the inner end of the spray pipe is positioned in the air buffer chamber, the outer end of the spray pipe extends out of the air buffer chamber, two ends of the spray pipe are closed, and the spray holes are formed in the pipe wall of the spray pipe close to the outer end of the spray pipe;

an inner limiting piece and an outer limiting piece are respectively arranged on the outer surface of the pipe wall of the spray pipe, and the inner limiting piece and the outer limiting piece are respectively positioned inside and outside the air buffer chamber;

the pipe wall of the spray pipe is annularly and non-uniformly provided with an air inlet which is communicated with the inner cavity of the air buffer chamber;

and an air inlet interface is also arranged on the wall of the air buffer chamber.

By adopting the design, the air flow jet device has the advantages that the jet pipe is movably arranged on the air buffer chamber, the air inlet on the jet pipe is unevenly arranged, and the jet pipe generates play and rotation under the impact of air flow, so that air jetted by the air jet head generates turbulence and stirs water, and the mixing effect of pumped air and water is improved.

As a preferred technical scheme, only one air inlet is formed in the pipe wall of the spray pipe, the air inlet is rectangular arc-surface-shaped and is arranged along the circumferential direction of the spray pipe, a pair of straight edges of the air inlet is respectively connected with an air guide plate, the air guide plate comprises a first air guide plate and a second air guide plate, one straight edge of the air inlet extends outwards to form the first air guide plate, the other straight edge of the air inlet extends inwards to form the second air guide plate, the two air guide plates are arranged in parallel, and the planes of the two air guide plates are located on the same side of the pipe center line of the spray pipe.

Design more than adopting, its advantage lies in that first air guide plate outwards stretches out, and the guide air current gets into the sprinkling irrigation, and second air guide pipe guide air current flows to one side flow of spray tube, and the air current flows through the central line of the direction skew spray tube of air inlet, strengthens its rotatory effect.

As a preferred technical scheme, the inner limiting piece and the outer limiting piece are respectively an inner limiting ring and an outer limiting ring which are fixedly sleeved on the outer wall of the spray pipe;

the air inlet interface is opposite to the inner end of the spray pipe, and the inner limiting ring is provided with a turbulent flow notch.

By adopting the design, the play range of the spray pipe is limited, the inner limiting ring is just opposite to the air inlet interface, the air flow positively impacts the inner limiting ring and bypasses the edge of the inner limiting ring to enter the air inlet, the turbulent notch is arranged to prevent the air flow from continuously jacking the inner limiting ring on the inner wall of the air buffer chamber, the turbulent effect of the air in the air buffer chamber is further enhanced, and the rotation of the spray pipe is further enhanced.

As a preferred technical scheme, a buffering pressure spring is further sleeved outside the spraying pipe and located between the inner limiting ring and the inner wall of the air buffering chamber.

By adopting the design, the impact of the inner limiting ring on the inner wall of the air buffer chamber is reduced.

According to the preferable technical scheme, the inner side surface of the barrel cover is connected with a hanging piece for hanging the filter bag;

a filter bag supporting and clamping mechanism is further arranged between the barrel cover and the inner wall of the filter barrel and is used for clamping the bag opening of the filter bag, so that the filter bag is upwards unfolded and is suspended in the filter barrel.

By adopting the design, the filter bag opening is hung on the hanging piece, the filter bag is placed into the filter barrel together when the barrel cover is buckled, the filter bag is supported by the filter bag to clamp and expand the bag opening after being placed into the filter barrel, the filter bag is guaranteed to allow overflow liquid to be filtered to completely flow through the filter bag, the barrel cover is taken out after the filter is completed, the filter bag is taken out, the filter bag is very convenient, and the filter bag is easy to replace.

As a preferred technical scheme, the filter bag supporting and clamping mechanism comprises a supporting ring horizontally arranged in the filter vat, and the outer edge of the supporting ring is attached and fixedly connected with the inner wall of the filter vat;

a compression ring is fixedly connected below the inner side surface of the barrel cover, is positioned above the support ring and is opposite to the support ring, the compression ring and the support ring clamp the mouth part of the filter bag, and the bag body of the filter bag passes through an inner hole of the support ring and hangs freely;

the hanging piece is arranged on the compression ring and is a hanging column, at least two hanging columns which are vertically arranged are distributed on the upper surface of the compression ring in a ring direction, and the edge of the bag opening of the filter bag is hung on the hanging columns.

By adopting the design, the filter bag is clamped and unfolded by the compression ring and the support ring after being placed into the filter vat, and the bag opening is attached to the inner wall of the filter vat, so that the slime with the filter can completely flow through the filter bag.

According to the preferable technical scheme, the compression ring is connected with at least three support rods, all the support rods are circumferentially and uniformly distributed around the central line of the compression ring, all the support rods are obliquely arranged, the upper ends of the support rods are fixedly connected with the inner side of the middle of the barrel cover, and the lower ends of the support rods are fixedly connected with the inner edge of the compression ring.

By adopting the design, the supporting rod has certain elasticity, and after the barrel cover and the filter barrel are locked by the locking mechanism, the supporting rod compresses the pressing ring on the supporting ring, so that the filter bag is clamped tightly.

As a preferred technical scheme, the compression ring comprises rigid arc sections and elastic arc sections, the rigid arc sections correspond to the support rods one by one, the middle parts of the rigid arc sections are connected with the lower ends of the support rods, the elastic arc sections are arranged between any two adjacent rigid arc sections, and all the rigid arc sections and the elastic arc sections are alternately arranged and annularly connected to form the compression ring;

the upper surface of each rigid arc section is respectively and vertically provided with one hanging column.

Design more than adopting, its advantage lies in that when branch pushed down, the clamp ring takes place a small amount of deformations and expands outward, arranges the clamp ring design for rigidity segmental arc and elasticity segmental arc in turn, and wherein rigidity segmental arc plays and connects branch, plays the supporting role to the filter bag, and elasticity segmental arc plays tensile deformation effect to realize that the hoop of whole clamp ring expands outward and compresses tightly the filter bag downwards on the support ring, the side direction makes the filter bag tightly support the lauter tub inner wall simultaneously.

Preferably, the support rod is curved upward.

By adopting the design, the elasticity of the supporting rod is kept.

As the preferred technical scheme, the outer wall of the opening of the filter barrel is fixedly sleeved with a flange ring;

the locking mechanism is provided with two locking bolts, the two locking bolts are symmetrically distributed on two sides of the center line of the flange ring, one end of a stud of each locking bolt is hinged with the flange ring, and the other end of the stud is provided with a locking nut;

the outer edge of the flange ring is respectively corresponding to each stud and is provided with a rotating notch, the outer edge of the barrel cover is respectively corresponding to each stud and is provided with a abdicating notch, the rotating notch and the abdicating notch which correspond to the same stud are vertically opposite and communicated to form a locking notch, the locking notch vertically penetrates through the flange ring and the barrel cover, the locking notch horizontally penetrates out of the flange ring and the outer edge of the barrel cover, and the studs penetrate through the locking notch.

By adopting the design, the barrel cover is convenient to take down and install.

As the preferred technical scheme, the lower part of the filter vat is provided with a supporting filter screen, and the bottom of the filter bag falls on the supporting filter screen.

By adopting the design, the filter bag is prevented from being damaged by mud adhesion impact.

Compared with the prior art, the beneficial effects of the utility model are that: the air that lets in biochemical pond is through leaping up the air shower nozzle blowout, stirs the water around the air shower nozzle better to improve the mixed effect of air and water, promote the digestion of microorganism, the sewage after the digestion gets into the sedimentation tank and deposits, and the upper overflow liquid that contains the solid matter gets into filter equipment and filters, and the solid matter is collected as the agricultural fertilizer that has economic value by the filter bag, and the filtrate is discharged up to standard.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of the biochemical tank;

fig. 3 is a schematic structural view of the bouncing air shower;

FIG. 4 is a schematic structural view of the nozzle;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is a schematic view of the structure of the filter device;

fig. 7 is an enlarged view of a portion m1 in fig. 6;

fig. 8 is an enlarged view of a portion m2 in fig. 6;

FIG. 9 is a schematic structural view of a lauter tub;

fig. 10 is a schematic structural view of a barrel cover and a compression ring;

fig. 11 is a bottom view of fig. 10.

Detailed Description

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

As shown in fig. 1, a park domestic sewage treatment system comprises a biochemical pond 100, a settling tank 200 and a filtering device 300, wherein a liquid outlet of the biochemical pond 100 is connected with a liquid inlet of the settling tank 200 through a first liquid pump, an overflow port is arranged at the upper part of the settling tank 200, and the overflow port is connected with a liquid inlet of the filtering device 300 through a second liquid pump.

As shown in fig. 2, an air supply pipe 120 is laid at the bottom of the biochemical pool 100, at least one leap air nozzle 130 is connected to the air supply pipe 120, and the leap air nozzles 130 are all located on the upper surface of the air supply pipe 120. The air inlet end of the air supply pipe 120 extends out of the biochemical pool 100 and is connected with an air compressor 110.

As shown in fig. 3-5, the bouncing air nozzle 130 comprises an air buffer chamber 138 and a nozzle 131. The air buffer chamber 138 comprises two cylinders, one end of which is closed, and the openings of the two cylinders are engaged and flanged to form the air buffer chamber 138. An air inlet connector 139 is arranged on the end plate of one of the cylinders, and a spray pipe 131 is movably arranged on the end plate of the other cylinder in a penetrating manner.

The inner end of the nozzle 131 is located in the air buffer chamber 138, and the air inlet 139 is opposite to the inner end of the nozzle 131. The outer end of the nozzle 131 extends out of the air buffer chamber 138, the two ends of the nozzle 131 are closed, and a plurality of nozzle holes 134 are formed on the wall of the nozzle 131 close to the outer end of the nozzle.

As shown in fig. 4, an inner limiting member 133 and an outer limiting member 132 are respectively disposed on the outer surface of the pipe wall of the nozzle 131, and the inner limiting member 133 and the outer limiting member 132 are respectively located inside and outside the air buffer chamber 138. Specifically, the inner limiting member 133 and the outer limiting member 132 are respectively an inner limiting ring and an outer limiting ring fixedly sleeved on the outer wall of the nozzle 131.

As shown in fig. 4 and 5, the wall of the nozzle 131 is circumferentially provided with air inlets 135 in a non-uniform manner, and the air inlets 135 are communicated with the inner cavity of the air buffer chamber 138. The simplest situation is that only one air inlet 135 is formed in the pipe wall of the spray pipe 131, the air inlet 135 is rectangular arc-surface-shaped and is arranged along the circumferential direction of the spray pipe 131, a pair of straight edges of the air inlet 135 is connected with one air guide plate 136 respectively, the air guide plate 136 comprises a first air guide plate and a second air guide plate, one straight edge of the air inlet 135 extends outwards to form the first air guide plate, the other straight edge extends inwards to form the second air guide plate, the two air guide plates 136 are arranged in parallel, and the planes of the two air guide plates 136 are located on the same side of the pipe center line of the spray pipe 131. Thus, the nozzle 131 is rotated in the direction of the arrow shown in fig. 5 when air is introduced.

In order to further enhance the air turbulence, the inner limiting ring is provided with a turbulence notch 133 a. In this embodiment, there is only one turbulent notch 133a corresponding to one side wall of the air inlet 135.

A buffer compression spring 137 is further sleeved outside the spray pipe 131, and the buffer compression spring 137 is located between the inner limiting ring and the inner wall of the air buffer chamber 138.

As shown in fig. 6 to 9, the filtering device 300 includes a filtering barrel 310 with an opening at the top, a barrel cover 320 is covered on the opening of the filtering barrel 310, a liquid inlet pipe 311 is disposed on the upper portion of the barrel wall of the filtering barrel 310, the liquid inlet pipe 311 is connected to the second liquid pump, a liquid outlet pipe 312 is disposed at the bottom of the filtering barrel 310, and a filtering bag 380 is disposed in the filtering barrel 310.

The inner side surface of the barrel cover 320 is connected with a hanging piece 340 for hanging the filter bag 380, and a filter bag supporting and clamping mechanism is further arranged between the barrel cover 320 and the inner wall of the filter barrel 310 and used for clamping the bag opening of the filter bag 380, so that the opening of the filter bag 380 is upwards unfolded and hung in the filter barrel 310.

The filter bag supporting and clamping mechanism comprises a supporting ring 360 horizontally arranged in the filter vat 310, and the outer edge of the supporting ring 360 is attached to and fixedly connected with the inner wall of the filter vat 310.

A compression ring 330 is fixedly connected to the lower portion of the inner side surface of the tub cover 320, the compression ring 330 is connected with three support rods 350, all the support rods 350 are circumferentially and uniformly distributed around the central line of the compression ring 330, all the support rods 350 are obliquely arranged, the upper ends of the support rods 350 are fixedly connected with the inner side of the middle portion of the tub cover 320, and the lower ends of the support rods 350 are fixedly connected with the inner edge of the compression ring 330. The strut 350 is curved upwardly to improve its elastic deformation under pressure.

The hanging piece 340 is arranged on the clamp ring 330, the edge of the mouth of the filter bag 380 is hung on the hanging piece 340, and the clamp ring 330 is surrounded by the filter bag 380 at the moment.

The clamp ring 330 is located above and opposite to the support ring 360, the clamp ring 330 and the support ring 360 clamp the mouth of the filter bag 380, so that the opening of the filter bag 380 is unfolded upwards, and the bag body passes through the inner hole of the support ring 360 and hangs freely.

The lower portion of the lauter tub 310 is provided with a support screen 313, and the bottom of the filter bag 380 falls on the support screen 313.

The inner end opening of the liquid inlet pipe 311 corresponds to the space between any two adjacent supporting rods 350. The opening of the filter bag 380 is lower than the inner end opening of the liquid inlet pipe 311.

A locking mechanism is arranged between the barrel cover 320 and the filter barrel 310. When the two are locked, the struts 350 are compressed to compress the clamp ring 330 against the support ring 360, thus clamping the filter bag 380. To increase the fit of the compression ring 330 to the support ring 360, the compression ring 330 is designed to have a certain elastic expansion and deformation capability. As shown in fig. 10 and 11, in particular, the compression ring 330 includes rigid arc sections 331 and elastic arc sections 332, the rigid arc sections 331 correspond to the struts 350 one to one, the middle portions of the rigid arc sections 331 are connected to the lower ends of the struts 350, the elastic arc sections 332 are disposed between any two adjacent rigid arc sections 331, and all the rigid arc sections 331 and the elastic arc sections 332 are alternately arranged and annularly connected to form the compression ring 330. In the unstressed condition, the outer diameter of clamp ring 330 is slightly smaller than the outer diameter of support ring 360 but larger than the inner diameter of support ring 360. Thus, when the lid 320 is fastened to the tub 310, the struts 350 act downwardly and outwardly on the rigid segments 331, so that the filter bag 380 is pressed vertically against the support ring 360 and circumferentially against the inner wall of the tub 310.

The rigid arc 331 may be made of steel bar, the elastic arc 332 may be made of rubber bar, the two ends of the rubber bar are provided with docking blind holes, the two ends of the steel bar are respectively provided with docking plugs, the docking plugs are inserted into the corresponding docking blind holes, and the rubber bar is fixed on the docking plugs by fastening screws.

The hanging pieces 340 may be hanging posts, one hanging post is vertically arranged on the upper surface of each rigid arc 331, and the edges of the bag openings of the filter bags 380 are hung on the hanging posts.

The flange ring 110 is fixedly sleeved on the outer wall of the opening of the filter barrel 310. The locking mechanism is a locking bolt 370, the number of the locking bolts 370 is two, the two locking bolts 370 are symmetrically distributed on two sides of the center line of the flange ring 314, one end of a stud 371 of the locking bolt 370 is hinged to the flange ring 314, a locking nut 372 is arranged at the other end of the stud 371, and the locking nut 372 is a butterfly nut.

The outer fringe punishment of flange ring 110 corresponds every respectively rotation breach 315 has been seted up to double-screw bolt 371, bung 320 outer fringe punishment corresponds every respectively the double-screw bolt 371 has been seted up and has been abdied breach 321, and it is same to correspond double-screw bolt 371 rotation breach 315 and abdication breach 321 are just right from top to bottom and communicate in order to form the locking breach, and this locking breach is vertical to be run through flange ring 110 with bung 320, the outside level of this locking breach is worn out flange ring 110 with the outward flange of bung 320, double-screw bolt 371 is worn to establish in this locking breach.

The upper surface of the barrel cover 320 is provided with a handle 210. When the barrel cover 320 needs to be removed, the locking nut 372 is unscrewed, then the locking bolt 370 is rotated from the locking notch to unlock the barrel cover 320, and as shown in fig. 4, the barrel cover 320 is removed and the filter bag 380 is synchronously taken out. After the filter bag 380 is filled with sludge, it is removed and replaced, and then the lid 320 with the empty filter bag 380 suspended thereon is covered on the filter vat 310 again and locked.

After the domestic sewage flows into the biochemical pool 100, the air introduced into the pool is ejected by the leaping air nozzles 130, and the leaping air nozzles 130 rotate while leaping up and down, so that the air is dispersed to the surrounding water body in a large range, and the water body is stirred, thereby promoting the decomposition of organic wastes in the water body by microorganisms. The digested sewage enters a settling tank 200 to be settled, precipitates are periodically cleaned to be used as organic fertilizers, an upper water body also contains a certain amount of solid matters, and the direct discharge cannot reach the standard, so that the digested sewage is filtered by a filtering device 300, the solid matters are bagged to be used as agricultural fertilizers, and filtered filtrate is discharged again. The whole device is economical and efficient, and meets the requirement of domestic sewage treatment in small parks.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and the scope of the present invention.

Claims (10)

1. The utility model provides a garden domestic sewage treatment system, includes biochemical pond (100), subsider (200) and filter equipment (300), the liquid outlet of biochemical pond (100) with the inlet of subsider (200) is connected, the upper portion of subsider (200) is equipped with the overflow mouth, this overflow mouth with the inlet of filter equipment (300) is connected, its characterized in that:

an air supply pipe (120) is laid at the bottom of the biochemical pool (100), and at least one leap air spray head (130) is connected to the air supply pipe (120);

the filtering device (300) comprises a filtering barrel (310) with an opening at the upper part, a barrel cover (320) is buckled on the opening of the filtering barrel (310), a locking mechanism is arranged between the barrel cover (320) and the filtering barrel (310), a liquid inlet pipe (311) is arranged at the upper part of the barrel wall of the filtering barrel (310), the liquid inlet pipe (311) is connected with the overflow port, and a liquid outlet pipe (312) is arranged at the bottom of the filtering barrel (310);

the filter barrel (310) is detachably provided with a filter bag (380).

2. The campus domestic sewage treatment system of claim 1 wherein: the leap air nozzle (130) comprises a spray pipe (131) provided with spray holes (134) and an air buffer chamber (138), the spray pipe (131) is movably arranged on the wall of the air buffer chamber (138) in a penetrating mode, the inner end of the spray pipe (131) is located in the air buffer chamber (138), the outer end of the spray pipe (131) extends out of the air buffer chamber (138), two ends of the spray pipe (131) are closed, and the spray holes (134) are formed in the pipe wall of the spray pipe (131) close to the outer end of the spray pipe;

an inner limiting piece (133) and an outer limiting piece (132) are respectively arranged on the outer surface of the pipe wall of the spray pipe (131), and the inner limiting piece (133) and the outer limiting piece (132) are respectively positioned inside and outside the air buffer chamber (138);

the pipe wall of the spray pipe (131) is annularly and non-uniformly provided with air inlets (135), and the air inlets (135) are communicated with the inner cavity of the air buffer chamber (138);

and an air inlet interface (139) is also arranged on the wall of the air buffer chamber (138).

3. The campus domestic sewage treatment system of claim 2 wherein: only one air inlet (135) has been seted up on the pipe wall of spray tube (131) air inlet (135), air inlet (135) are the rectangular arc face form and set up along the hoop of spray tube (131), a pair of sharp limit of air inlet (135) is connected with one air guide plate (136) respectively, air guide plate (136) include first air guide plate and second air guide plate, one of them sharp limit of air inlet (135) outwards extends in order to form first air guide plate, and another sharp limit inwards extends in order to form second air guide plate, two air guide plate (136) parallel arrangement, and two air guide plate (136) place plane all is located same one side of spray tube (131) pipeline.

4. The campus domestic sewage treatment system of claim 2 wherein: the inner limiting piece (133) and the outer limiting piece (132) are respectively an inner limiting ring and an outer limiting ring which are fixedly sleeved on the outer wall of the spray pipe (131);

the air inlet interface (139) is opposite to the inner end of the spray pipe (131), and the inner limiting ring is provided with a turbulent notch (133 a).

5. The campus domestic sewage treatment system of claim 4 wherein: and a buffer compression spring (137) is further sleeved outside the spray pipe (131), and the buffer compression spring (137) is positioned between the inner limiting ring and the inner wall of the air buffer chamber (138).

6. The campus domestic sewage treatment system of claim 1 wherein: the inner side surface of the barrel cover (320) is connected with a hanging piece (340) for hanging the filter bag (380);

a filter bag supporting and clamping mechanism is further arranged between the barrel cover (320) and the inner wall of the filter barrel (310), and the filter bag supporting and clamping mechanism is used for clamping the mouth of the filter bag (380) so that the opening of the filter bag (380) is upwards unfolded and suspended in the filter barrel (310).

7. The campus domestic sewage treatment system of claim 6 wherein: the filter bag supporting and clamping mechanism comprises a supporting ring (360) horizontally arranged in the filter vat (310), and the outer edge of the supporting ring (360) is attached to and fixedly connected with the inner wall of the filter vat (310);

a compression ring (330) is fixedly connected below the inner side surface of the barrel cover (320), the compression ring (330) is positioned above the support ring (360) and is arranged opposite to the support ring, the compression ring (330) and the support ring (360) clamp the mouth of the filter bag (380), and the bag body of the filter bag (380) passes through the inner hole of the support ring (360) and hangs freely;

the hanging piece (340) is arranged on the compression ring (330), the hanging piece (340) is a hanging column, at least two hanging columns which are vertically arranged are annularly distributed on the upper surface of the compression ring (330), and the edge of the bag opening of the filter bag (380) is hung on the hanging column.

8. The campus domestic sewage treatment system of claim 7 wherein: the utility model discloses a barrel cover, including clamp ring (330), clamp ring (330) is connected with three piece at least branch (350), all branch (350) wind the central line hoop evenly distributed of clamp ring (330), all branch (350) all sets up to one side, the upper end of branch (350) with the inboard fixed connection in middle part of bung (320), the lower extreme of branch (350) with the inner edge fixed connection of clamp ring (330).

9. The campus domestic sewage treatment system of claim 8 wherein: the compression ring (330) comprises rigid arc sections (331) and elastic arc sections (332), the rigid arc sections (331) correspond to the support rods (350) one by one, the middle parts of the rigid arc sections (331) are connected with the lower ends of the support rods (350), the elastic arc sections (332) are arranged between any two adjacent rigid arc sections (331), and all the rigid arc sections (331) and the elastic arc sections (332) are alternately arranged and are annularly connected to form the compression ring (330);

the upper surface of each rigid arc section (331) is respectively provided with one hanging column.

10. The campus domestic sewage treatment system of claim 8 wherein: a flange ring (314) is fixedly sleeved on the outer wall of the barrel opening of the filter barrel (310);

the locking mechanism is provided with two locking bolts (370), the two locking bolts (370) are symmetrically distributed on two sides of the center line of the flange ring (314), one end of a stud (371) of each locking bolt (370) is hinged with the flange ring (314), and the other end of the stud (371) is provided with a locking nut (372);

the outer fringe punishment of flange ring (314) do not correspond every rotation breach (315) has been seted up to double-screw bolt (371), bung (320) outer fringe punishment do not correspond every double-screw bolt (371) seted up abdicating breach (321), and it is same to correspond double-screw bolt (371) rotation breach (315) and abdicating breach (321) just right from top to bottom and communicate in order to form the locking breach, and this locking breach is vertical runs through flange ring (314) with bung (320), the outside level of this locking breach is worn out flange ring (314) with the outward flange of bung (320), double-screw bolt (371) are worn to establish in this locking breach.

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