CN112279390B - Municipal wastewater treatment process - Google Patents

Abstract

The invention discloses a municipal sewage treatment process, which comprises the following steps: carrying out residue crushing treatment on the introduced sewage to obtain sewage with crushed residues; carrying out preliminary filtration on sewage with broken residues, and separating the broken residues from the sewage to obtain preliminarily filtered sewage; and carrying out multistage fine filtration on the preliminarily filtered sewage to obtain sewage reaching the discharge standard. The municipal wastewater treatment process is high in automation degree, has a self-cleaning function, is high in treatment efficiency and good in treatment effect, and can be used for effectively treating municipal wastewater.

Description

Municipal wastewater treatment process

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a municipal sewage treatment process.

Background

The prior art discloses municipal sewage treatment equipment with application number of CN201910070548.6, including treatment box, blow off pipe and delivery port, one side top of treatment box is connected with outside sewage the blow off pipe, treatment box opposite side bottom has been seted up the delivery port, install governing valve on the delivery port, wherein, treatment box interior upper portion from the top down fixed mounting has filter plate, coarse filtration net and thin filter screen in proper order, treatment box interior bottom one side is equipped with the slope mesa, treatment box interior bottom opposite side is equipped with the filter chamber, wherein, from left to right installs first filter screen, second filter screen and third filter screen in proper order in the filter chamber, treatment box interior upper portion just is located the structure of smash is installed to the top of filter plate.

When the municipal sewage treatment equipment disclosed by the above is used for sewage treatment, broken residues are inconvenient to clean, and if the broken residues are cleaned, the sewage treatment is required to be stopped, so that the sewage treatment efficiency is greatly reduced.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a municipal sewage treatment process.

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

according to the present invention there is provided a municipal sewage treatment process comprising:

carrying out residue crushing treatment on the introduced sewage to obtain sewage with crushed residues;

carrying out preliminary filtration on sewage with broken residues, and separating the broken residues from the sewage to obtain preliminarily filtered sewage;

and carrying out multistage fine filtration on the preliminarily filtered sewage to obtain sewage reaching the discharge standard.

Preferably, the step of subjecting the introduced sewage to residue crushing treatment to obtain sewage with crushed residues comprises:

the sewage that introduces flows to residue crushing mechanism, and residue crushing mechanism includes the U template and with the sliding plate of U template cooperation use, the equal fixedly connected with of one side that sliding plate and U template are relative each other is broken fragments, and the continuous up-and-down motion of U template relative sliding plate to carry out broken processing and leak down with the residue in the sewage, obtain the sewage that has broken residue.

Preferably, the sliding plate is fixed on the inner wall of the treatment box, and the U-shaped plate is arranged in the treatment box in a vertical sliding manner.

Preferably, the sewage with broken residues is subjected to preliminary filtration, the broken residues are separated from the sewage, and the obtained preliminary filtered sewage comprises:

the sewage with broken residues enters the filter bin assembly, the broken residues are filtered onto the filter screen of the filter bin assembly, and the sewage leaks downwards, so that the broken residues are separated from the sewage, and the preliminarily filtered sewage is obtained.

Preferably, the filter screen is of a disc-shaped structure, and continuously rotates in the preliminary filtering process, and the residues with larger particle diameters in the crushed residues are thrown to the peripheral edge of the disc-shaped filter screen under the action of centrifugal force.

Preferably, the filter screen is continuously vibrated during the preliminary filtering process.

Preferably, the filter screen is made of a metal material.

Preferably, subjecting the preliminarily filtered sewage to multistage fine filtration comprises:

the sewage of preliminary filtration passes through the filter screens that the multistage is arranged in proper order according to different filtration grades to realize filtering the layering of sewage step by step.

Preferably, a membrane filtration is also provided after the multistage filtration.

Compared with the prior art, the invention has the beneficial effects that:

the municipal wastewater treatment process is high in automation degree, has a self-cleaning function, is high in treatment efficiency and good in treatment effect, and can be used for effectively treating municipal wastewater.

Drawings

Fig. 1 shows a flow chart of steps of a municipal wastewater treatment process according to an embodiment of the invention.

Fig. 2 is a sectional view of a municipal sewage treatment apparatus according to an embodiment of the invention.

Fig. 3 is an enlarged view of a portion a of fig. 2.

Fig. 4 is a side view of a municipal sewage treatment apparatus according to an embodiment of the invention.

Fig. 5 is a top view of a cross plate in a municipal sewage treatment apparatus according to an embodiment of the invention.

Fig. 6 is a top view showing a fitting structure of a U-shaped plate and a sliding plate in municipal sewage treatment apparatus according to an embodiment of the invention.

Fig. 7 to 8 are perspective views showing schematic views of a cleaning tray in a municipal sewage treatment apparatus according to an embodiment of the invention.

Fig. 9 illustrates a front view of a cleaning tray in a municipal sewage treatment apparatus according to an embodiment of the invention.

Fig. 10 is a cross-sectional view A-A in fig. 9.

In the figure: 1 treatment box, 2 water inlet pipe, 3 box, 4U template, 5 sliding plate, 6 connecting plate, 7 fixed block, 8 montants, 9 springs, 10 cross plates, 11 first arc wedge block, 12 second arc wedge block, 13 filter screen, 131 first grinding bulge, 14 filter bin, 141 annular groove, 142 limit groove, 15 transverse pipe, 16 adjusting spring, 17 protective case, 18 rotating rod, limit bulge 181, 19 first bevel gear, 20 second bevel gear, 21 shaft lever, 22 driving motor, 23 filter case, 24 manual valve, 25 installation block, 26 negative pressure fan, 27 air inlet pipe, 28 conveying pipe, 29 collecting box, 30 broken fragments, 31 drain pipe, 32 cleaning disc, 321 conical lower leakage cavity, 322 annular lower leakage part, 323 second grinding bulge, 324 rotating shaft hole, 325 limit lug, 33 adjusting arm, 34 supporting rod, 35 adjusting rope, 36 acting rod, 37 counterweight.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present application relates to a municipal sewage treatment process using a municipal sewage treatment apparatus, which is first described below.

Referring to fig. 2-10, a municipal wastewater treatment device, including treatment tank 1, inlet mechanism is installed to treatment tank 1's upper end, treatment tank 1 is interior inlet mechanism's below is equipped with the broken mechanism of residue, the broken mechanism of residue includes U template 4 and sliding plate 5, the broken mechanism of residue is used for receiving the sewage from inlet mechanism and carries out broken processing to the residue wherein, be equipped with U template 4 in treatment tank 1, be equipped with on treatment tank 1's the inner wall with the sliding plate 5 that U template 4 cooperation was used, U template 4 relative sliding plate 5 can slide from top to bottom, sliding plate 5 and the equal fixedly connected with broken piece 30 of U template 4 one side each other, sliding plate 5 passes through two connecting plates 6 and treatment tank 1's inner wall fixed connection, can break great residue through broken piece 30.

The U-shaped plate 4 slides in the treatment box 1 through two limiting mechanisms, each limiting mechanism comprises two fixed blocks 7 fixedly connected with the inner wall of the treatment box 1, a vertical rod 8,U is fixedly connected between the two fixed blocks 7, a sliding block is fixedly connected on the U-shaped plate 4, and a vertical rod 8 penetrates through the sliding block and is in sliding connection with the sliding block; the sliding block and the two fixing blocks 7 are fixedly connected with springs 9, the two springs 9 are sleeved on the vertical rods 8, and the U-shaped plate 4 can be limited through the cooperation of the fixing blocks 7 and the vertical rods 8, so that the U-shaped plate can only move up and down along the vertical rods 8.

The water inlet mechanism comprises a water inlet pipe 2 penetrating through the upper end of the treatment box 1 and fixedly connected with the water inlet pipe 2, the bottom of the water inlet pipe 2 is fixedly connected with a box body 3, an opening is formed in the bottom of the box body 3, the bottom opening of the box body 3 is opposite to the crushing block 30, so that sewage can be directly conveyed between the U-shaped plate 4 and the sliding plate 5, and the U-shaped plate 4 has certain guiding capability, so that the sewage cannot flow in disorder.

The inner wall of the treatment box 1 is fixedly connected with a protective box 17, which can protect the first bevel gear 19 and the second bevel gear 20, so that the treatment box is not easy to be corroded by sewage; the guard box 17 is equipped with the dwang 18 rather than rotating the connection from top to bottom throughout, be equipped with power unit between dwang 18 and the outer wall of handling case 1, power unit includes the driving motor 22 with handling case 1 outer wall fixed connection, driving motor 22's output fixedly connected with axostylus axostyle 21, axostylus axostyle 21 runs through handling case 1 and guard box 17 in proper order to with handling case 1 and guard box 17 rotatable coupling, the lower extreme fixedly connected with first bevel gear 19 of dwang 18, the other end fixedly connected with second bevel gear 20 of axostylus axostyle 21, first bevel gear 19 and second bevel gear 20 intermeshing.

The treatment box 1 is also internally provided with a filter bin assembly which is used for carrying out coarse filtration on the sewage after residue crushing and can be also understood as pre-filtration before fine filtration. The filter bin assembly comprises a filter bin 14 and a filter screen 13, wherein the filter bin 14 is fixedly connected to the inner wall of the treatment box 1, the filter screen 13 is connected to the inner peripheral wall of the filter bin 14 in a vertically sliding manner, the filter screen 13 is arranged at the bottom of the filter bin, the filter screen is connected to a rotating rod 18 in a vertically sliding manner, the filter screen 13 and the rotating rod 18 are coaxially arranged, and the filter screen 13 can rotate under the drive of the rotating rod 18; the bottom opening of filtering storehouse 14, the cover is equipped with adjusting spring 16 on the dwang 18, and adjusting spring 16's up end top is connected in the bottom of filter screen 13, and the lower terminal surface top is connected in the roof of protective housing 17, and adjusting spring 16 is used for balancing the weight of the filter residue that bears on the filter screen 13 on the one hand, and on the other hand is used for making the filter screen moderately shake under the drive of dwang 18 pivoted in-process to the leak of sewage of being convenient for. The filter 13 is particularly selected as a metal filter

Specifically, an annular groove 141 is formed in the lower portion of the inner peripheral wall of the filter bin 14, the annular groove 141 extends along the circumferential direction of the filter bin 14, the filter screen 13 is of a disc-shaped structure, an insertion portion is formed in the outer edge of the filter screen 13, and the filter screen 13 is inserted into the annular groove 141 through the insertion portion; the axis position department of filter screen 13 is equipped with the spliced eye that uses with dwang 18 cooperation, the spliced eye is used for the passing of dwang 18, two spacing grooves have been seted up on the inner peripheral wall of spliced eye, two spacing grooves set up relatively, i.e. be located on the same diameter of spliced eye, the extending direction of two spacing grooves is parallel with the axis of filter screen, be equipped with two spacing protruding 181 on the outer peripheral wall of dwang 18, two spacing protruding 181 set up relatively, and set up, the cooperation is used with two spacing grooves correspondence, dwang 18 is pegged graft in the spliced eye, wherein two spacing protruding 181 card respectively go into two spacing inslot, thereby make filter screen 13 can slide from top to bottom along dwang 18 and rotate under the drive of dwang 18. Further, a plurality of first grinding protrusions 131 are uniformly distributed on the upper surface of the filter screen. Two limiting grooves 142 are formed in the upper end face of the inner peripheral wall of the filter cartridge 14, and the two limiting grooves 142 are arranged opposite to each other and extend in a direction parallel to the axis of the cleaning disc 32.

Further, this sewage treatment device still includes automatic cleaning device for be difficult to the residue of outer row in the filtration storehouse assembly clear up, this automatic cleaning device includes clearance dish 32, adjusting arm 33, bracing piece 34 and adjusting rope 35, clearance dish 32 slidable from top to bottom locates on the inner wall of filtration storehouse 14, and clearance dish 32 locates the top of filter screen 13, the bracing piece 34 is vertical locates on the inboard diapire of handling case 1, adjusting arm 33 is rotatable locate on bracing piece 34, the first end of adjusting arm 33 is connected with the first end of adjusting rope 35, the second end of adjusting rope 35 is connected on clearance dish 32, be equipped with action bar 36 on the second end of adjusting arm 33, action bar 36 is towards the top, specifically set up towards the diapire of filter screen 13, the lower extreme of action bar 36 is connected with the second end of adjusting arm 33, be equipped with the spheroid on the upper end, the spheroid is used for the diapire top grafting with filter screen 13.

In this embodiment, the conditioning cord 35 is wound around the outer wall of the filter cartridge 14 and has a second end attached to the upper surface of the cleaning disc 32 near the axis of the filter cartridge.

Referring to fig. 7 to 10, the cleaning plate 32 is provided with a through rotation shaft hole 324 along an axial direction, and the rotation lever 18 passes through the rotation shaft hole 324 so that the rotation lever 18 can rotate relative to the cleaning plate 32; the annular lower leakage part 322 is formed around the rotating shaft hole 324, the annular lower leakage part 322 comprises a plurality of lower leakage holes which are distributed at intervals along the circumferential direction, the lower leakage holes penetrate through the thickness direction of the cleaning disc 32, and the number of the lower leakage holes is four, and can be selected to be a plurality according to specific needs. A conical lower leakage cavity 321 is arranged on the first surface of the cleaning disc 32, wherein the large end of the conical lower leakage cavity 321 is arranged at the upper end and the lower end, the bottom of the conical lower leakage cavity 321 is communicated with the annular lower leakage part 322, the conical lower leakage cavity 321 is used for receiving municipal sewage after residue crushing treatment, and then the sewage is leaked downwards to the filter screen 13 of the filter bin assembly through the cleaning disc 32; the second surface of the cleaning tray 32, i.e., the surface facing downward, is provided with a plurality of second grinding protrusions 323, and the second grinding protrusions 323 cooperate with the first grinding protrusions 131 to grind the residue and sundries on the filter screen 13, which are difficult to clean and suck. Two opposite limiting lugs 325 are arranged on the peripheral wall of the cleaning disc 32, the limiting lugs 325 are matched with the limiting grooves 142 on the filter bin 14, and the cleaning disc 32 is clamped in the two limiting grooves 142 through the two limiting lugs 325, so that the cleaning disc 32 can only move up and down relative to the filter bin 14.

Further, a row of adjusting holes are formed in the adjusting arm 33 along the extending direction of the adjusting arm 33, and are used for adjusting the hinge position of the adjusting arm 33 and the supporting rod 34, so that the up-and-down moving range of the cleaning disc 32 is adjusted, and the best residue grinding effect is achieved.

In this embodiment, the portion between the hinge axis of the adjusting arm 33 and the first end thereof is a first arm, the portion between the hinge axis of the adjusting arm 33 and the second end thereof is a second arm, the length of the first arm is greater than that of the second arm, and the length of the first arm is 1.5-3 times that of the second arm, so when the filter screen 13 is used for a long time, the filter screen 13 sinks when the filter screen 13 has more residues accumulated thereon due to the fact that residues with larger particle sizes and the like cannot be discharged out of the treatment box 1 in time, and when the second arm is pressed down by the filter screen 13 by a small amplitude, the cleaning disc 32 can move down relatively to the filter screen 13 by a large amplitude, so that the cleaning disc 32 and the filter screen are close to each other, a grinding space is formed between the two, and the filter screen 13 rotates to further grind residues in the grinding space, thereby facilitating the discharge of the difficult residues on the filter screen 13 in time; on the contrary, when the residue accumulated on the filter screen 13 is cleaned and discharged out and reduced, the filter screen 13 is lifted up to a small extent, and the cleaning disc 32 is lifted up to a large extent, and the space between the cleaning disc 32 and the filter screen 13 is enlarged so as to restore the normal filtering function, so that the structure arrangement realizes the effect that the micro motion of the filter screen 13 forms the large motion feedback of the cleaning disc 32, realizes the automatic cleaning of the filter bin 14, and prevents excessive accumulation of residue sundries on the filter screen 13.

Further, a counterweight is suspended on the first arm of the adjusting arm 33 for making the sphere of the action bar 36 always rest against the bottom wall of the filter screen 13.

The upper end of the rotating rod 18 and the bottom of the U-shaped plate 4 are provided with a reciprocating mechanism, the reciprocating mechanism comprises a cross plate 10 fixedly connected with the upper end of the rotating rod 18, the upper end of the cross plate 10 is fixedly connected with a plurality of first arc-shaped wedge blocks 11, for example, four first arc-shaped wedge blocks 11 are arranged on the respective ends of two cross plates of the cross plate, the bottom of the U-shaped plate 4 is fixedly connected with a second arc-shaped wedge block 12, the first arc-shaped wedge blocks 11 are matched with the second arc-shaped wedge blocks 12, and the second arc-shaped wedge blocks 12 are positioned on the rotating circumference of the first arc-shaped wedge blocks 11. In this embodiment, the number of the second arc-shaped wedge blocks 12 is one, but is not limited to one, and a plurality of second arc-shaped wedge blocks may be provided as needed. The first arc-shaped wedge blocks 11 and the second arc-shaped wedge blocks 12 are matched for use, wherein the arc shape in the first arc-shaped wedge blocks 11 is an arc-shaped extension, specifically referring to fig. 3, the four first arc-shaped wedge blocks 11 are respectively arc-shaped extensions, the four first arc-shaped wedge blocks 11 are all distributed on the same circumference, each first arc-shaped wedge block 11 can be seen as a circular arc section when seen from top in fig. 3, and the wedge shape is a large end and a small end at two ends of the arc section, and smooth transition is realized between the large end and the small end.

Two slag removing mechanisms which are arranged front and back are arranged between the filtering bin 14 and the processing box 1, each slag removing mechanism comprises a mounting block 25 which is fixed on the outer wall of the processing box 1, a negative pressure fan 26 is mounted on each mounting block 25, an air inlet pipe 27 is fixedly connected to the air inlet end of each negative pressure fan 26, the air inlet pipe 27 penetrates through the processing box 1 and is fixedly connected with the processing box 1, and the other end of each air inlet pipe 27 is fixedly connected with a transverse pipe 15; the first end of the transverse tube 15 is connected with the air inlet tube 27, the end head of the second end is inserted on the outer wall of the filter bin 14, the transverse tube 15 penetrates through the outer wall of the filter bin 14, so that the transverse tube 15 is communicated with the filter bin 14, and residues on the filter screen 13 can be sucked out through the transverse tube 15; the transverse pipes 15 are arranged in front and back opposite directions, under the normal use state of the filter bin assembly, the transverse pipes 15 are positioned between the filter bin 14 and the filter screen 13, when the filter bin cannot be used normally due to the fact that large-particle-size residues which are difficult to discharge are accumulated on the filter screen 13, the two transverse pipes 15 are blocked when a cleaning disc of the filter bin assembly moves downwards, so that the transverse pipes 15 are suspended to absorb large-particle residues on the filter screen 13, and the transverse pipes 15 are prevented from being blocked by the large-particle residues. The outer wall of the treatment box 1 is fixedly connected with a collecting box 29, and the air outlet end of the negative pressure fan 26 is communicated with the collecting box 29 through a conveying pipe 28.

The bottom of the collecting box 29 is penetrated and provided with a drain pipe 31 fixedly connected with the collecting box, the drain pipe 31 penetrates through the treatment box 1 and is in sealing connection with the treatment box, and a filter screen is arranged on the drain pipe 31, so that sewage in the collecting box 29 can be discharged into the treatment box 1 again.

One side of the treatment box 1 is provided with a filter box 23, one side of the filter box 23 opposite to the treatment box 1 is provided with a manual valve 24, a filter mechanism is arranged in the filter box 23, and the filter mechanism consists of three different treatment filter screens for finely filtering municipal sewage.

When the invention is used, the water inlet pipe 2 is connected with a sewage conveying pipeline, and when sewage is cleaned, the driving motor 22 is started, the driving motor 22 rotates to drive the shaft lever 21 to rotate, so that the second bevel gear 20 and the first bevel gear 19 rotate, the rotating rod 18 rotates, the filter screen cross plate 10 is driven by the rotating rod 18 to rotate, the first arc-shaped wedge block 11 rotates, the first arc-shaped wedge block 11 intermittently abuts against the second arc-shaped wedge block 12 and limits the second arc-shaped wedge block 12, when the first arc-shaped wedge block 11 abuts against the second arc-shaped wedge block 12, the U-shaped plate 4 moves upwards under the limit of the first arc-shaped wedge block 11, namely the first arc-shaped wedge block 11 gradually cuts into the second arc-shaped wedge block 12 from the small end to the large end in the rotating process, so that the second arc-shaped wedge block 12 is gradually jacked to realize upward movement of the U-shaped plate 4, and at the moment, the spring 9 deforms; when the first arc-shaped wedge block 11 is not propped against the second arc-shaped wedge block 12, the U-shaped plate 4 falls down and resets under the action of the spring 9, so that the continuous up-and-down movement of the U-shaped plate 4 can be realized, and larger residues are crushed by the crushing blocks 30 through the continuous up-and-down movement of the U-shaped plate 4 relative to the sliding plate 5.

When sewage passes between the U-shaped plate 4 and the sliding plate 5, the sewage flows into the filter bin 14 and finally falls down through the filter screen 13, wherein larger residues carried in the sewage are crushed under the action of the relatively moving crushing blocks 30 and finally fall into the filter bin 14, so that the residues are crushed.

When the driving motor 22 is started, the two negative pressure fans 26 are also started, negative pressure can be generated at the bottom of the short pipe 16 when the negative pressure fans 26 work, residues on the filter screen 13 can be sucked away through the negative pressure and conveyed into the collecting box 29 through the conveying pipe 28, so that the work of sewage treatment is not required to be stopped, the cleaning of the residues is realized, the efficiency of sewage treatment is improved, meanwhile, the residues can be collected, and the sewage treatment is convenient.

The municipal sewage filtered by the filter bin assembly enters the filter box 23 for further fine filtration and is discharged.

Referring to fig. 1, the municipal sewage treatment process of the present application includes the following steps, with specific reference to the following steps S01-S03), and is comprehensively understood in conjunction with the above description of the municipal sewage treatment apparatus.

S01) carrying out residue crushing treatment on the introduced sewage to obtain sewage with crushed residues;

in this step, from the sewage flow to the residue crushing mechanism of the box 3 downflow of water inlet mechanism, residue crushing mechanism includes U template 4 and the sliding plate 5 that uses with U template 4 cooperation, the equal fixedly connected with of one side that sliding plate 5 and U template 4 are relative each other breaks piece 30, and the continuous up-and-down motion of U template relative sliding plate 5 to carry out broken processing and leak down with the residue in the sewage, obtain the sewage that has broken residue.

In addition, as the bottom opening of the box body 3 is opposite to the crushing block 30, sewage can be directly conveyed between the U-shaped plate 4 and the sliding plate 5, and the U-shaped plate 4 has certain guiding capability, so that the sewage cannot flow in disorder.

The more detailed residue crushing treatment step can be referred to the above description about the specific structure of the municipal sewage treatment apparatus, and will not be repeated here.

S02) carrying out preliminary filtration on the sewage with the broken residues, and separating the broken residues from the sewage to obtain preliminarily filtered sewage;

in the step, sewage with broken residues enters a filter bin assembly, the broken residues are filtered to a filter screen 13 of the filter bin assembly, the sewage leaks downwards, and the broken residues are isolated on the filter screen 13, so that the broken residues and the sewage are separated, and the preliminarily filtered sewage is obtained.

In the preliminary filtration process, the filter screen 13 continuously rotates, and under the action of centrifugal force, the residues with larger particle diameters in the crushed residues are thrown to the peripheral edge of the disc-shaped filter screen 13, so that the separation and distribution of the residues with large particle diameters and the residues with small particle diameters are realized, the residues are prevented from being accumulated at one place, and the sewage is difficult to leak. Due to the arrangement of the adjusting spring 16, the filter screen 13 continuously vibrates up and down in a small amplitude, when the filter screen 13 rotates to the position of the transverse pipe 15 and vibrates upwards to the position close to the opening of the transverse pipe, the transverse pipe 15 sucks the residues close to the filter screen 13 under the action of negative pressure to be discharged, and the way avoids the phenomenon that a large amount of residues are sucked into the transverse pipe to cause the blockage of the transverse pipe.

When the filter screen 13 is used for a long time, for example, residues with larger particle sizes and the like cannot be timely discharged out of the treatment box 1, so that the filter screen 13 can sink when more residues are accumulated on the filter screen 13, and when the second arm is pressed down by the filter screen 13 by a small extent, the cleaning disc 32 can be greatly moved downwards relative to the filter screen 13, so that the cleaning disc 32 and the filter screen are close to each other, a grinding space is formed between the cleaning disc 32 and the filter screen, the filter screen 13 rotates to further grind the residues in the grinding space, and therefore the difficult-to-treat residues on the filter screen 13 can be effectively and timely discharged; on the contrary, when the residue accumulated on the filter screen 13 is cleaned and discharged out and reduced, the filter screen 13 is lifted up to a small extent, and the cleaning disc 32 is lifted up to a large extent, and the space between the cleaning disc 32 and the filter screen 13 is enlarged so as to restore the normal filtering function, so that the structure arrangement realizes the effect that the micro motion of the filter screen 13 forms the large motion feedback of the cleaning disc 32, realizes the automatic cleaning of the filter bin 14, and prevents excessive accumulation of residue sundries on the filter screen 13.

Under the normal use state of the filter house assembly, the transverse tube 15 is positioned between the filter house 14 and the filter screen 13, when the filter house with large grain size residues which are difficult to discharge and accumulated on the filter screen 13 can not be used normally because of more filter houses with large grain size residues, the cleaning disc of the filter house assembly moves downwards to block the two transverse tubes 15, so that the transverse tubes 15 pause to absorb the large grain residues on the filter screen 13, and the transverse tubes 15 are prevented from being blocked by the large grain residues.

The more detailed preliminary filtering step may refer to the above description about the specific structure of the municipal sewage treatment apparatus, and will not be repeated here.

S03) carrying out multistage fine filtration on the preliminarily filtered sewage to obtain sewage reaching the discharge standard.

In the step, the preliminarily filtered sewage passes through the filter screens which are sequentially arranged according to different filter grades, so that the layered step-by-step filtration of the sewage is realized.

Further, the membrane filtration is further arranged after the multistage filtration, so that the required sewage treatment components and effects are more accurately obtained. The specific type of membrane may be selected as desired and will not be described in detail herein.

The municipal wastewater treatment process is high in automation degree, has a self-cleaning function, is high in treatment efficiency and good in treatment effect, and can be used for effectively treating municipal wastewater.

The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (9)

1. A municipal wastewater treatment process, comprising:

carrying out residue crushing treatment on the introduced sewage to obtain sewage with crushed residues;

carrying out preliminary filtration on sewage with broken residues, and separating the broken residues from the sewage to obtain preliminarily filtered sewage;

carrying out multistage fine filtration on the preliminarily filtered sewage to obtain sewage reaching the discharge standard;

the municipal sewage treatment process utilizes municipal sewage treatment equipment for treatment, the municipal sewage treatment equipment comprises a treatment box (1), a filter bin assembly and an automatic cleaning device,

wherein, carry out preliminary filtration to the sewage that has broken residue, with broken residue and sewage separation, obtain preliminary filtration's sewage and include:

the treatment box (1) is internally provided with a filter bin assembly, the filter bin assembly is used for coarsely filtering sewage after residue crushing, the filter bin assembly comprises a filter bin (14) and a filter screen (13), the filter bin (14) is fixedly connected to the inner wall of the treatment box (1), the filter screen (13) can be connected to the inner peripheral wall of the filter bin (14) in a vertical sliding manner, the filter screen (13) is arranged at the bottom of the filter bin, the filter screen can be connected to a rotating rod (18) in a vertical sliding manner, the filter screen (13) and the rotating rod (18) are coaxially arranged, the filter screen (13) can rotate under the driving of the rotating rod (18), the bottom of the filter bin (14) is opened, an adjusting spring (16) is sleeved on the rotating rod (18), the upper end face of the adjusting spring (16) is propped against the bottom of the filter screen (13), the lower end face of the adjusting spring (16) is propped against the top wall of the protective box (17), and the adjusting spring (16) is used for balancing the weight of filter residues borne on the filter screen (13), and the filter screen is convenient for shaking and leaking in the process of the sewage driven by the rotating rod (18) to moderately rotate;

the automatic cleaning device is used for cleaning residues which are difficult to discharge outside in the filter bin assembly and comprises a cleaning disc (32), an adjusting arm (33), a supporting rod (34) and an adjusting rope (35), wherein the cleaning disc (32) can be arranged on the inner wall of the filter bin (14) in a vertical sliding mode, the cleaning disc (32) is arranged above the filter screen (13), the supporting rod (34) is vertically arranged on the bottom wall of the inner side of the treatment box (1), the adjusting arm (33) is rotatably arranged on the supporting rod (34), the first end of the adjusting arm (33) is connected with the first end of the adjusting rope (35), the second end of the adjusting rope (35) is connected onto the cleaning disc (32), an acting rod (36) is arranged at the second end of the adjusting arm (33), the acting rod (36) faces upwards, particularly faces towards the bottom wall of the filter screen (13), the lower end of the acting rod (36) is connected with the second end of the adjusting arm (33), and a sphere is arranged on the end head of the upper end and is used for being in top connection with the bottom wall of the filter screen (13);

the part between the hinge shaft of the adjusting arm (33) and the first end of the adjusting arm is a first arm, the part between the hinge shaft of the adjusting arm (33) and the second end of the adjusting arm is a second arm, the length of the first arm is longer than that of the second arm, and the length of the first arm is 1.5-3 times that of the second arm;

when the filter screen (13) is used for a long time, the filter screen (13) can sink when more residues are accumulated on the filter screen (13) because residues with larger particle sizes and the like cannot be discharged out of the treatment box (1) in time, and when the second arm of the adjusting arm (33) is pressed down by the filter screen (13) in a small amplitude, the cleaning disc (32) can move down relatively to the filter screen (13) in a large amplitude, so that the cleaning disc (32) and the filter screen are close to each other, a grinding space is formed between the cleaning disc and the filter screen, the filter screen (13) rotates to further grind the residues in the grinding space, and therefore difficult-to-treat residues on the filter screen (13) can be discharged effectively in time; on the contrary, when the residue accumulated on the filter screen (13) is cleaned and discharged out to be reduced, the filter screen (13) is lifted up to a small extent, and the cleaning disc (32) is lifted up to a large extent, and the space between the cleaning disc (32) and the filter screen (13) is enlarged so as to restore the normal filtering function.

2. The municipal sewage treatment process according to claim 1, wherein the step of subjecting the introduced sewage to residue crushing treatment to obtain sewage with crushed residues comprises:

the sewage that introduces flows to residue crushing mechanism, and residue crushing mechanism includes U template (4) and slide plate (5) that use with U template (4) cooperation, a plurality of broken fragments (30) of equal fixedly connected with of one side that slide plate (5) and U template (4) are relative each other, and the continuous up-and-down motion of U template (4) relative slide plate (5) to carry out broken processing and leak down with the residue in the sewage, obtain the sewage with broken residue.

3. The municipal sewage treatment process according to claim 2, wherein the sliding plate (5) is fixed on the inner wall of the treatment tank (1), and the U-shaped plate (4) is slidably provided in the treatment tank (1) up and down.

4. The municipal wastewater treatment process according to claim 1, wherein the wastewater with the crushed residues is subjected to preliminary filtration, the crushed residues are separated from the wastewater, and the preliminary filtered wastewater is obtained comprising:

the sewage with broken residues enters the filter bin assembly, wherein the broken residues are filtered to a filter screen (13) of the filter bin assembly, and the sewage leaks downwards, so that the broken residues and the sewage are separated, and the preliminarily filtered sewage is obtained.

5. The municipal sewage treatment process according to claim 4, wherein the filter screen (13) has a disc-shaped structure, the filter screen (13) continuously rotates in the preliminary filtration process, and residues with larger particle diameters in the crushed residues are thrown to the peripheral edge of the disc-shaped filter screen (13) under the action of centrifugal force.

6. The municipal sewage treatment process according to claim 5, wherein the filter screen (13) is continuously vibrated during the preliminary filtration.

7. A municipal sewage treatment process according to any of claims 4-6, wherein the filter screen (13) is made of a metallic material.

8. The municipal wastewater treatment process of claim 1, wherein subjecting the primarily filtered wastewater to multistage fine filtration comprises:

the sewage of preliminary filtration passes through the filter screens that the multistage is arranged in proper order according to different filtration grades to realize filtering the layering of sewage step by step.

9. The municipal sewage treatment process according to claim 8, wherein a membrane filtration is further provided after the multistage filtration.

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