CN116750923B

CN116750923B - Sewage treatment process and sewage treatment device

Info

Publication number: CN116750923B
Application number: CN202310931229.6A
Authority: CN
Inventors: 蓝如辉; 曾明; 谢倩兰; 刘亮; 黄旭凯; 洪兵; 曾尚锋
Original assignee: Guangdong Wanlv Environmental Protection Group Co ltd
Current assignee: Guangdong Wanlv Environmental Protection Group Co ltd
Priority date: 2023-07-27
Filing date: 2023-07-27
Publication date: 2024-01-19
Anticipated expiration: 2043-07-27
Also published as: CN116750923A

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment process and a sewage treatment device, wherein the sewage treatment process comprises the steps of flowing sewage into a reaction zone, adding a flocculating agent into the reaction zone to mix the flocculating agent with suspended matters in the sewage to obtain flocculates, enabling the flocculates to enter a sedimentation zone from the reaction zone to be separated and discharged or flow back to the reaction zone to obtain clarified water, and filtering and collecting the clarified water in the sedimentation zone by a denitrification deep bed filter.

Description

Sewage treatment process and sewage treatment device

Technical Field

The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment process and a sewage treatment device.

Background

In daily life, people can produce a lot of domestic sewage which contains pollutants such as nitrogen, phosphorus and the like, if the domestic sewage is directly discharged into natural water, the water quality of the water is deteriorated, the development and improvement of urban economic level are finally affected, the denitrification and dephosphorization processes such as A/A/O, SBR, oxidation ditch and the like applied in China can generally only stably meet the requirement of the first grade B standard in the pollutant emission standard of urban sewage treatment plants (GB 18918-2002), and particularly, the SS index hardly meets the first grade A emission standard;

a sewage treatment process and a sewage treatment device according to the patent application number CN202110498002.8, wherein the sewage treatment process comprises: s10, conveying sewage into an anaerobic tank and an anoxic tank respectively, and treating the sewage in the anaerobic tank and then feeding the sewage into the anoxic tank for deep denitrification; s20, sewage in the anoxic tank flows out in two ways, one way flows back into the anaerobic tank, and the other way sequentially passes through the anoxic aeration tank and the aerobic zone for full nitrification; s30, sewage in the aerobic zone flows out in two ways, one way flows back to the anoxic tank, and the other way is input into the secondary sedimentation tank for mud-water separation to form precipitated sludge; s40, returning the precipitated sludge to a sludge regeneration tank, and performing aeration treatment in the sludge regeneration tank to form activated sludge; s50, the activated sludge in the sludge regeneration tank flows back to the anoxic tank, but the technical scheme does not increase the strengthening treatment process after the dephosphorization and denitrification sewage treatment process, SS, a small amount of organic pollutants and the like in the sewage cannot be removed, and the sewage is still harmful to the environment after being discharged.

Disclosure of Invention

In order to solve the above problems, the present invention provides a sewage treatment process, comprising the following steps:

s1, flocculation treatment: the sewage flows into the reaction zone, and a flocculating agent is added into the reaction zone so as to mix the flocculating agent with suspended matters in the sewage to obtain flocculates;

s2, precipitation treatment: sewage and flocculate enter a precipitation zone from a reaction zone so as to precipitate, separate and discharge or reflux the flocculate to the reaction zone, thus obtaining clarified water;

s3, filtering: the denitrification deep bed filter filters the clarified water in the sedimentation zone, and discharges and collects the clarified water.

Further, in S1, in the flocculation treatment, a flocculating agent is added into a reaction zone, and meanwhile, a stirring and discharging part is controlled to stir and mix sewage and the flocculating agent.

Further, in S1, the sewage flows into the central reaction cylinder in the reaction zone at first, is mixed with the flocculating agent in the central reaction cylinder, and enters the area between the central reaction cylinder and the reaction zone under the pushing of the subsequent water inflow, so that the sewage, the flocculating agent and the mixed solution of the flocculating matter flowing back to the reaction zone circularly flow inside and outside the central reaction cylinder.

Further, in S2, in the sedimentation treatment, sewage and flocculate enter the sedimentation zone from the reaction zone, the sewage is blocked by the first baffle plate and the second baffle plate in sequence, and enters the sedimentation zone through a transition zone formed between the first baffle plate and the second baffle plate.

Further, in S2, after sewage and flocculate enter the sedimentation zone from the reaction zone, the flocculate is precipitated to the bottom of the sedimentation zone to form sludge, and the precipitated sludge is concentrated and scraped by a concentrating sludge scraper.

Further, in S2, after sewage and flocculate enter the sedimentation zone from the reaction zone, part of flocculate can flow back to the reaction zone through a variable frequency backflow sludge pump so that flocculant carried in the backflow flocculate and sewage are mixed for reaction.

Further, the process also comprises a de-denitrification treatment: the sewage enters an anaerobic tank for anaerobic dephosphorization treatment and then enters an oxidation ditch tank for nitrification and denitrification treatment; after the sewage is separated from the denitrification treatment, flocculation treatment is carried out.

The invention also provides a sewage treatment device which is used for treating sewage according to the sewage treatment process, the device comprises an anaerobic tank, an oxidation ditch tank, a water inlet pipe, a sewage treatment tank and an upper cover plate, the upper end of the sewage treatment tank is fixedly connected with the upper cover plate, a first baffle plate and a second baffle plate are fixedly connected inside the sewage treatment tank, the first baffle plate and the second baffle plate are arranged in parallel and are vertical to the sewage treatment tank, the first baffle plate is fixedly connected to the top of the sewage treatment tank, the lower end of the first baffle plate and the bottom of the sewage treatment tank form a transition area, the lower end of the second baffle plate is fixedly connected to the bottom of the sewage treatment tank, the upper end of the first baffle plate and the top of the sewage treatment tank form a transition area, the sewage treatment tank is divided into a reaction area, a transition area and a sedimentation area by the first baffle plate and the second baffle plate, the anaerobic tank and the oxidation ditch tank are fixedly connected to one end of the water inlet pipe, and the other end of the water inlet pipe is inserted into the sewage treatment tank from the bottom;

a central reaction cylinder and a stirring and blanking component are arranged in the reaction zone, and the stirring and blanking component rotates in the central reaction cylinder; the upper end and the lower end of the central reaction cylinder are communicated with the reaction zone; the water inlet pipe is inserted into the central reaction cylinder, and the stirring and discharging part is fixedly connected to the upper cover plate;

the sedimentation area comprises a mud scraper drive, a first transmission rod, a mud scraper, grid bars, a mud discharge pipe, a mud return pipe and a clarification component, wherein the mud scraper drive is fixedly connected to an upper cover plate, the lower end of the mud scraper drive is fixedly connected with one end of the first transmission rod, the other end of the transmission rod is fixedly connected to the mud scraper, the mud scraper is in sliding connection with the bottom of the sewage treatment box, the upper end of the mud scraper is vertically fixed with a plurality of grid bars, the bottom of the sewage treatment box is fixedly connected with one end of the mud discharge pipe, the other end of the mud discharge pipe is connected to a mud discharge pump, the upper part of the sedimentation area is provided with the clarification component, one end of the clarification component is fixed at the upper end of one side of the sewage treatment box, one end of the mud return pipe is inserted into the sedimentation area from the bottom of the sewage treatment box, the other end of the mud return pipe is fixedly connected to the water inlet pipe, and a variable-frequency backflow mud pump is arranged in the middle of the mud return pipe;

the upper end of one side of the sewage treatment box, which is close to the sedimentation area, is connected with a denitrification deep bed filter.

Further, stirring and unloading part includes the agitator drive, agitator drive and upper cover plate fixed connection, agitator drive lower extreme fixed connection runner one, runner one and runner two pass through belt drive connection, runner two and upper cover plate rotation connection, runner two lower extreme fixedly connected with connecting pipe, connecting pipe lower extreme fixedly connected with agitator head, the agitator head rotates along its circumferencial direction and connects three stirring leaf, the inside bull stick that rotates of connecting pipe is connected with, the inner rotating rod lower extreme respectively with three stirring She Chilun meshing transmission, upper cover plate lower extreme is fixed three support pole one end respectively, three support pole and three outer dish frame one-to-one, three pinch roller support is fixed in the connecting pipe middle part from top to bottom in proper order, pinch roller and pinch roller support rotation connection, the hose has all been placed to every outer dish frame inboard, the hose is by outer dish frame inboard and three pinch roller extrusion deformation, hose and three pinch roller rotation connection, three hose one end are located respectively on three stirring leaf upper ends, three hose other end all are connected in the feed cylinder bottom, feed cylinder fixed connection is on the upper cover plate, the flocculant is stored in the feed cylinder, the centre of a circle of the agitator head and the inside the reactor is located the reactor centre of a circle.

Further, the clarification part includes the shell, shell inside sliding connection has the inner shell, shell top opening sets up, shell one side's upper end is provided with the delivery port, shell lower extreme fixed connection cylinder one, the inner shell is connected to cylinder one upper end, sliding connection inclined tube group in the inner shell, shell upper end fixedly connected with inlet tube two, inlet tube two internal rotation connection valve, inner shell upper end fixed connection water pipe three, water pipe three and water diversion pipe four sliding connection, water diversion pipe four and five sliding connection of water diversion pipe, water diversion pipe five and former water pipe sliding connection, former water pipe and water diversion box fixed connection, water diversion box and a plurality of shower nozzles fixed connection, former water pipe and balladeur train fixed connection, balladeur train sliding connection is on the inner shell, balladeur train upper end fixed connection elongated slot, the open position of balladeur train upper end fixed connection water catch bowl corresponds with the delivery port, fixed connection carousel below the motor, carousel fixed connection, carousel central point and bull stick a one end pass through connecting rod fixed connection, the other end arch of bull stick a is located the elongated slot, connecting rod rotation between carousel and bull stick a is connected on the bracing piece, bracing piece both ends fixed connection is in the inner shell, double-deck water inlet row edge is arranged alternately to two sides of water inlet row tooth.

The invention has the advantages that:

1. the improved oxidation ditch scheme has the advantages of good treatment effect, stable and mature effluent quality, advanced and mature technology, high power efficiency, high operation reliability and flexibility, simpler operation, management and maintenance, easy management and small occupied area.

2. The technology of the high-efficiency sedimentation tank and the denitrification deep bed filter is adopted, and has the advantages of small occupied area, simple sludge treatment, low medicine consumption, rapid process starting, convenient operation and maintenance and the like, and simultaneously improves the capability of removing TN, SS, TP, a small amount of organic pollutants and the like, and purified water can reach the first-level A standard of pollutant emission standard of urban water purification plants.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic diagram of a clarifying component according to the present invention;

FIG. 3 is a schematic diagram of a clarifying component according to the present invention;

FIG. 4 is a schematic diagram of a clarifying component according to the present invention;

FIG. 5 is a partial enlarged view A of FIG. 2;

FIG. 6 is a schematic diagram of a stirring and blanking member structure of the present invention;

FIG. 7 is a schematic diagram II of a stirring and blanking member structure of the present invention;

FIG. 8 is a schematic diagram III of a stirring and blanking member structure of the present invention;

the figure indicates:

a. a sewage treatment tank; b. a first baffle; c. a second baffle; 1. an anaerobic tank; 2. an oxidation ditch pool; 3. a water inlet pipe; 4. a reaction zone; 401. a central reaction cylinder; 5. an upper cover plate; 6. stirring and blanking components; 601. a stirrer drive; 602. a first rotating wheel; 603. a belt; 604. a second rotating wheel; 605. a connecting pipe; 606. a stirrer head; 607. stirring the leaves; 608. an inner rotating rod; 609. a bracket rod; 610. an outer tray frame; 611. a pinch roller bracket; 612. a pinch roller; 613. a hose; 614. a charging barrel; 7. a precipitation zone; 701. a mud scraper is driven; 702. a transmission rod I; 703. a mud scraping plate; 704. a grid bar; 705. a mud pipe; 8. a sludge return pipe; 801. a variable frequency return sludge pump; 9. a clarification component; 901. a housing; 902. an inner case; 903. a water outlet; 904. a first cylinder; 905. a diagonal tube set; 906. a water inlet pipe II; 907. a valve; 908. a third water pipe; 909. a water diversion pipe IV; 910. a water diversion pipe V; 911. a front water pipe; 912. a water distribution box; 913. a spray head; 914. a carriage; 915. a motor; 916. a turntable; 917. a support rod; 918. a rotating rod a; 919. a long groove; 920. a water collection tank; 921. an edge; 10. and (3) a denitrification deep bed filter.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of 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 "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Example 1

As shown in fig. 1 to 8, a sewage treatment process comprises the following steps:

s1, flocculation treatment: the sewage flows into the reaction zone 4, and a flocculating agent is added into the reaction zone 4 so as to mix the flocculating agent with suspended matters in the sewage to obtain flocculates;

s2, precipitation treatment: the sewage and the flocculate enter a sedimentation zone 7 from the reaction zone 4 so as to lead the flocculate to be sedimentated, separated and discharged or flow back to the reaction zone 4 to obtain clarified water;

s3, filtering: the denitrification deep bed filter 10 filters the clarified water in the sedimentation zone 7, and discharges and collects the clarified water.

The working principle of the technical scheme is as follows: the sewage flows into the central reaction cylinder 401 of the reaction zone 4 from the water inlet pipe 3, the stirring and discharging part 6 stirs the sewage, meanwhile, a flocculating agent is added into the central reaction cylinder 401, the flocculating agent and suspended matters in the sewage are mixed to form flocculates, the sewage and the flocculates enter the sedimentation zone 7 through the baffle I and the baffle II, sediment and the flocculates in the sewage are settled to the bottom of the sedimentation zone 7, the mud scraper drive 701 drives the transmission rod I702 to rotate around the central axis of the tank, the mud scraper 703 pushes the sediment and the flocculates at the bottom of the sedimentation zone 7 from outside to inside to the mud discharge pipe 705 at the center of the tank, the grid 704 is stirred slowly, sediment and the flocculates in the sewage are accelerated to settle, the sediment and the flocculates in the mud discharge pipe 705 are discharged through a mud discharge pump connected to the mud discharge pump, the sediment and the sediment in the upper part of the sewage in the sedimentation zone 7 is filtered by the clarification part 9, the filtered sediment flows into the denitrification deep bed 10 by adopting quartz sand with special specification and shape as a film medium for the denitrification biological filter, and a small amount of TN, SS, TP and organic pollutants in the clarification bed can be removed.

Example 2

As shown in fig. 1 to 8, in the flocculation treatment, the stirring and discharging part 6 is controlled to stir and mix the sewage and the flocculant while adding the flocculant into the reaction zone 4;

the working principle of the technical scheme is as follows: the sewage moves from bottom to top in the central reaction cylinder 403 of the reaction zone 4, and the stirring and discharging part 6 releases the flocculant so that the sewage and the flocculant are sufficiently mixed.

Example 3

As shown in fig. 1 to 8, in the flocculation treatment, sewage firstly flows into a central reaction cylinder 401 in a reaction zone 4, is mixed with a flocculating agent in the central reaction cylinder 401, and enters a region between the central reaction cylinder 401 and the reaction zone 4 under the pushing of subsequent water inflow, so that the sewage, the flocculating agent and mixed liquid of flocculate flowing back to the reaction zone 4 circularly flow inside and outside the central reaction cylinder 401;

the working principle of the technical scheme is as follows: the sewage enters the central reaction cylinder 401 of the reaction zone 4, the stirring and discharging component 6 is started, the sewage is stirred, and the flocculating agent is added at the same time, so that the sewage is quickly mixed with the flocculating agent, and suspended matters in the sewage are combined with the flocculating agent to obtain flocculates.

Example 4

As shown in fig. 1 to 8, in the sedimentation treatment, when sewage and flocculate enter the sedimentation zone 7 from the reaction zone 4, the sewage is blocked by a first baffle plate b and a second baffle plate c in sequence, and enters the sedimentation zone 7 through a transition zone formed between the first baffle plate b and the second baffle plate c;

the working principle of the technical scheme is as follows: the water flow in the reaction area stirred by the flocculation stirrer is relatively turbulent, and the water flow passes through the first baffle plate b and the second baffle plate c to be buffered, so that the water flow becomes stable after entering the sedimentation area 7, and the flocculation sediment and the mud-water separation are facilitated.

Example 5

As shown in fig. 1-8, after the sewage and the flocculate enter the sedimentation zone 7 from the reaction zone 4, the flocculate is sedimented to the bottom of the sedimentation zone 7 to form sludge, and the sedimented sludge is concentrated and scraped by a concentrating sludge scraper;

the working principle of the technical scheme is as follows: the sewage and the flocculate enter the sedimentation area 7 through the baffle I and the baffle II, the sediment and the flocculate in the sewage are settled at the bottom of the sedimentation area 7, the mud scraper drives 701 the transmission rod I702 to rotate around the central axis of the pond, the mud scraping plate 703 pushes the sediment and the flocculate at the bottom of the sedimentation area 7 to the mud discharging pipe 705 at the center of the pond from outside to inside, the grid 704 is slowly stirred to accelerate the sediment and the flocculate in the sewage to settle, the sediment and the flocculate in the mud discharging pipe 705 are discharged through the mud discharging pump connected with the sediment discharging pipe, the supernatant water on the sewage in the sedimentation area 7 is discharged after the sediment is filtered by the clarification component 9, and the flocculate which is lighter and is not easy to settle in the sedimentation area 7 is sucked into the mud return pipe 8 through the variable frequency return mud pump 801 and returns to the water inlet pipe 3 to enter the reaction area 4 again for flocculation.

Example 6

As shown in fig. 1 to 8, in the sedimentation treatment, after sewage and flocculate enter the sedimentation zone 7 from the reaction zone 4, part of the flocculate can be refluxed to the reaction zone 4 by a variable frequency reflux sludge pump 801 so that flocculant carried in the reflux flocculate and sewage are mixed and reacted;

the working principle of the technical scheme is as follows: starting a variable frequency backflow sludge pump 801, sucking the light and difficultly precipitated flocculate in the precipitation zone 7 into a sludge backflow pipe 8 through the variable frequency backflow sludge pump 801, and flowing back to the water inlet pipe 3 to enter the central reaction cylinder 401 again for flocculation, so that the light and difficultly precipitated flocculate is prevented from upwards moving along with sewage to block the lower hole of the inclined pipe group 905.

Example 7

As shown in fig. 1-8, the process further includes a de-denitrification treatment: the sewage enters an anaerobic tank 1 for anaerobic dephosphorization treatment and then enters an oxidation ditch tank 2 for nitrification and denitrification treatment; after the sewage is separated from the denitrification treatment, flocculation treatment is carried out;

the working principle of the technical scheme is as follows: after the external sewage flows into the anaerobic tank 1 and the oxidation ditch 2 for denitrification and dephosphorization, phosphorus accumulating bacteria in the sewage are pressed under the anaerobic condition of the anaerobic tank 1 to release phosphate in the body, energy is generated to absorb and rapidly degrade organic matters and convert the organic matters into PHB poly beta hydroxybutyric acid to be stored, when the phosphorus accumulating bacteria are in the aerobic condition of the aerobic zone in the oxidation ditch 2, the PHB stored in the body is degraded to generate energy for synthesizing and absorbing phosphorus by cells, sludge with high phosphorus content is formed, and the sludge is discharged out of the system along with residual sludge, so that the aim of dephosphorization is achieved, organic nitrogen, protein nitrogen and the like in the sewage of the oxidation ditch 2 are firstly converted into ammonia nitrogen by ammoniation bacteria under the aerobic condition of the aerobic zone in the oxidation ditch 2, then become nitrate nitrogen under the action of nitrifying bacteria, and then the anoxic condition of the anoxic zone in the oxidation ditch 2 is escaped by denitrification bacteria under the action of the external carbon source, so that the nitrate nitrogen is reduced into nitrogen to escape from the sewage, and the aim of denitrification is achieved.

Example 8

As shown in fig. 1-8, a sewage treatment device is used for treating sewage according to the sewage treatment process described in any one of the above, the device comprises an anaerobic tank 1, an oxidation ditch tank 2, a water inlet pipe 3, a sewage treatment tank a and an upper cover plate 5, the upper end of the sewage treatment tank a is fixedly connected with the upper cover plate 5, a baffle one b and a baffle two c are fixedly connected in the sewage treatment tank a, the baffle one b is parallel to the baffle two c and are vertical to the sewage treatment tank a, the upper end of the baffle one b is fixedly connected to the top of the sewage treatment tank a, the lower end of the baffle one b forms a transition zone with the bottom of the sewage treatment tank a, the lower end of the baffle two c is fixedly connected to the bottom of the sewage treatment tank a, the upper end of the sewage treatment tank a forms a transition zone with the top of the sewage treatment tank a, the sewage treatment tank a is separated into a reaction zone 4, a transition zone and a sedimentation zone 7 by the baffle one b and the baffle two c, the anaerobic tank 1 is fixedly connected with the oxidation ditch tank 2 through a water pipe, the oxidation ditch tank 2 is fixedly connected to one end of the water inlet pipe 3, and the other end of the water inlet pipe is inserted into the sewage treatment tank from the bottom of the sewage treatment tank a;

a central reaction cylinder 401 and a stirring and blanking component 6 are arranged in the reaction zone 4, and the stirring and blanking component 6 rotates in the central reaction cylinder 401; the upper end and the lower end of the central reaction cylinder 401 are communicated with the reaction zone 4; the water inlet pipe 3 is inserted into the central reaction cylinder 401, and the stirring and discharging part 6 is fixedly connected to the upper cover plate 5;

the sedimentation area 7 comprises a sludge scraper drive 701, a first transmission rod 702, a sludge scraper 703, grid bars 704, a sludge discharge pipe 705, a sludge return pipe 8 and a clarification component 9, wherein the sludge scraper drive 701 is fixedly connected to the upper cover plate 5, the lower end of the sludge scraper drive 701 is fixedly connected with one end of the first transmission rod 702, the other end of the first transmission rod 702 is fixedly connected to the sludge scraper 703, the sludge scraper 703 is in sliding connection with the bottom of the sewage treatment tank a, the upper end of the sludge scraper 703 is vertically fixed with a plurality of grid bars 704, the bottom of the sewage treatment tank a is fixedly connected with one end of the sludge discharge pipe 705, the other end of the sludge discharge pipe 705 is connected to the sludge discharge pump, the clarification component 9 is arranged on the upper part of the sedimentation area 7, one end of the clarification component 9 is fixed on one side of the sewage treatment tank a, one end of the sludge return pipe 8 is inserted into the sedimentation area 7 from the bottom of the sewage treatment tank a, the other end of the sludge return pipe 8 is fixedly connected to the water inlet pipe 3, and a variable-frequency backflow sludge pump 801 is arranged in the middle of the sludge return pipe 8;

the upper end of one side of the sewage treatment box a, which is close to the sedimentation area 7, is connected with a denitrification deep bed filter 10;

the working principle of the technical scheme is as follows: after the external sewage flows into the anaerobic tank 1 and the oxidation ditch tank 2 for denitrification and dephosphorization, phosphorus accumulating bacteria in the sewage are pressed under the anaerobic condition of the anaerobic tank 1 to release phosphate in the body, energy is generated to absorb and rapidly degrade organic matters and convert the organic matters into PHB poly beta hydroxybutyric acid to be stored, when the phosphorus accumulating bacteria are in the aerobic condition of the aerobic zone in the oxidation ditch tank 2, the PHB stored in the body is degraded to generate energy for synthesizing cells and absorbing phosphorus to form sludge with high phosphorus content, the sludge is discharged out of the system along with residual sludge, thereby achieving the aim of dephosphorization, organic nitrogen, protein nitrogen and the like in the sewage of the oxidation ditch tank 2 are firstly converted into ammonia nitrogen by ammoniated bacteria under the aerobic condition of the aerobic zone in the oxidation ditch tank 2, and then the organic nitrogen is converted into nitrate nitrogen under the action of nitrifying bacteria, then under the anoxic condition of the anoxic zone in the oxidation ditch pool 2, the denitrifying bacteria act, and an external carbon source is used for providing energy, so that nitrate nitrogen is reduced into nitrogen gas and escapes from sewage, thereby achieving the aim of denitrification, the sewage enters the central reaction cylinder 401 of the reaction zone 4 from the water inlet pipe 3 after denitrification and dephosphorization of the anaerobic pool 1 and the oxidation ditch pool 2, the stirring and blanking component 6 is started to drive the sewage to move from bottom to top in the central reaction cylinder 403, and the stirring and blanking component 6 releases flocculant, so that the sewage and the flocculant are fully mixed, the water flow stirred by the flocculation stirrer in the reaction zone 4 is relatively rapid, the water flow is buffered by the transition baffle plate, so that the water flow becomes stable after entering the sedimentation zone 7, the flocculation sedimentation and the mud-water separation are facilitated, and the flocculation is downwards precipitated under the action of gravity and falls to the bottom of the sedimentation zone 7 in the sedimentation zone 7 where the water flow is relatively static, the mud scraper is started to drive the first transmission rod 702 to rotate around the central axis of the tank, the mud scraping plate 703 pushes sediment and flocculate at the bottom of the sedimentation area 7 to the mud discharging pipe 705 at the center of the tank from outside to inside, the grid bars 704 stir slowly to accelerate sedimentation of the sediment and flocculate in the sewage, the sediment and flocculate in the mud discharging pipe 705 are discharged through a mud discharging pump connected with the sediment discharging pipe, the supernatant water in the sedimentation area 7 is discharged after the sediment is filtered through the clarification component 9, the water after the sediment filtration flows into the denitrification deep bed filter 10, the denitrification deep bed filter 10 adopts quartz sand medium filter materials with the depth of 2-3mm, the depth of the filter bed is usually more than 1.83m, and the sewage passes through the deep bed filter, so that TN (total suspended solids) is less than or equal to 3mg/l, SS (suspended solids) is less than 2mg/l and other small amount of organic pollutants can be effectively removed.

Example 9

As shown in fig. 1-8, the stirring and discharging part 6 comprises a stirrer driving part 601, the stirrer driving part 601 is fixedly connected with an upper cover plate 5, the lower end of the stirrer driving part 601 is fixedly connected with a first rotating wheel 602, the first rotating wheel 602 is in transmission connection with a second rotating wheel 604 through a belt 603, the lower end of the second rotating wheel 604 is fixedly connected with a connecting pipe 605, the lower end of the connecting pipe 605 is fixedly connected with a stirrer head 606, the stirrer head 606 is rotationally connected with three stirring blades 607 along the circumferential direction, an inner rotating rod 608 is rotationally connected inside the connecting pipe 605, the lower end of the inner rotating rod 608 is respectively meshed with the three stirring blades 607 for transmission, one end of three support rods 609 is respectively fixed at the lower end of the upper cover plate 5, the three support rods 609 are fixed with three outer disc frames 610 one by one, the three pinch roller brackets 611 are sequentially fixed in the middle of the connecting pipe 605 from top to bottom, the three pinch rollers 612 are rotationally connected with the pinch roller brackets 611, a hose 613 is placed on the inner side of the outer disc frame 610, the hose 613 is extruded and deformed by the inner side of the outer disc frame 610 and the three pinch rollers 612, the hose 613 is rotationally connected with the three pinch rollers 612, one end of each of the three hoses 613 is respectively positioned at the upper ends of the three stirring blades 607, the other ends of the three hoses 613 are connected with the bottom ends of the charging barrels 614, the charging barrels 614 are fixedly connected to the upper cover plate 5, flocculating agents are stored in the charging barrels 614, the circle center of the stirrer head 606 is consistent with the circle center of the central reaction barrel 401, and the stirrer head 606 is positioned inside the central reaction barrel 401;

the working principle of the technical scheme is as follows: the stirrer driving 601 is started to drive the first rotating wheel 602 to rotate, the second rotating wheel 604 is driven to rotate through the belt 603, the stirrer head 606 is driven to rotate through the connecting pipe 605, the three stirring blades 607 are driven to rotate by taking the stirrer head 606 as the center to drive sewage to flow upwards in the central reaction cylinder 401, meanwhile, the connecting pipe 605 is driven to rotate to drive the three pinch roller brackets 611 to drive the three pinch rollers 612 to extrude the hose 613 to move forwards, the flocculant stored in the charging cylinder 614 flows into the hose 613 and is pushed forwards, after the hose at the rear is released, negative pressure is formed under the elastic action, huge suction force is generated to suck the flocculant stored in the charging cylinder 614 into the hose 613 again, the flocculant is continuously and repeatedly cut off at one end of the hose 613, the flocculant and the sewage flowing upwards are fully mixed to form the flocculant, the arrangement is such that the flocculant is prevented from being added before the water inlet pipe 3, sewage and flocculant react in advance to form the flocculating agent and block up inlet tube 3, simultaneously along with stirring speed is faster, pinch roller 612 extrudes the hose faster, extrude the flocculating agent more, when stirring speed is slow, extrude the flocculating agent less, and then when the stirring speed is controlled according to the sewage condition, also controlled the volume of extruding the flocculating agent, and then can reach the purpose of practicing thrift the flocculating agent, when agitator drive 601 stops moving, rotate the knob of interior bull stick 608 upper end, drive interior bull stick 608 rotation, the bevel gear of bull stick 608 lower extreme drives the bevel gear rotation of three stirring leaf 607 tip respectively, drive three stirring leaf 607 rotation, and then the area of contact of three stirring leaf 607 and sewage when changing stirring, and then change the stirring effect to sewage, can change three stirring leaf 607 according to the condition of different sewage and reach best coagulation effect.

Example 10

As shown in fig. 1-8, the clarifying component 9 comprises an outer shell 901, an inner shell 902 is slidably connected inside the outer shell 901, an opening is arranged at the top end of the outer shell 901, a water outlet 903 is arranged at the upper end of one side of the outer shell 901, the lower end of the outer shell 901 is fixedly connected with a first air cylinder 904, the upper end of the first air cylinder 904 is connected with the inner shell 902, an inclined tube group 905 is slidably connected in the inner shell 902, the upper end of the outer shell 901 is fixedly connected with a second water inlet tube 906, a valve 907 is rotatably connected in the second water inlet tube 906, a third water pipe 908 is fixedly connected in the upper end of the inner shell 902, a fourth water distribution pipe 909 is slidably connected with a fifth water distribution pipe 910, the fifth water distribution pipe 910 is slidably connected with a front water pipe 911, the front water pipe 911 is fixedly connected with a water distribution box 912, the water distribution box 912 is fixedly connected with a plurality of spray heads 913, the front water pipe 911 is fixedly connected with the carriage 914, the carriage 914 is slidably connected on the inner shell 902, the upper end of the carriage 914 is fixedly connected with a long groove 919, the upper end of the inner shell 902 is fixedly connected with a water collecting tank 920, the opening position of the water collecting tank 920 corresponds to the water outlet 903, the lower end of the water collecting tank 920 is fixedly connected with a motor 915, a turntable 916 is fixedly connected below the motor 915, the central position of the turntable 916 is fixedly connected with one end of a rotating rod a918 through a connecting rod, the other end of the rotating rod a918 is convexly arranged in a notch of the long groove 919, the connecting rod between the turntable 916 and the rotating rod a918 is rotationally connected on a supporting rod 917, two ends of the supporting rod 917 are fixedly connected in the inner shell 902, double-layer water inlet edges 921 are arranged at two side edges of the water collecting tank 920, and two rows of convex teeth of the double-layer water inlet edges 921 are alternately arranged;

the working principle of the technical scheme is as follows: the reaction zone 4 is continuously provided with sewage and flocculate which flow into the sedimentation zone 7 through the first baffle b and the second baffle c, the water level of the sedimentation zone 7 is continuously increased, flocculate in the sewage is sunk to the bottom of the sedimentation zone 7 due to gravity, clarified water rises in the inclined tube group 905, sixty degrees of the inclined tube group 905 is arranged in the inner shell 902, part of sludge in the clarified water slides down along the inclined tube and cannot cause blockage, the clarified water enters the water collecting tank 920 from the double-layer water inlet edge 921, the collected water is discharged from the water outlet 903, the double-layer water inlet edge 921 is arranged at the two side edges of the water collecting tank 920, two rows of convex teeth of the double-layer water inlet edge 923 are alternately arranged, so that the water passes through the double-layer water inlet edge 921, part of sediment can be remained in the double-layer water inlet edge 921, sediment in the sewage is filtered further, the cleanliness of the water is increased, the first air cylinder 904 is started to drive the inner shell 902 to rise in the outer shell 901, the inclined tube group 905 and the water collecting tank 920 are driven to rise to the water outlet position, if the inclined tube group 905 is replaced, the inclined tube group 905 is conveniently taken out, water does not need to be fed into and taken out of the inclined tube group 905, if the inclined tube group 905 is in a blocking state, the first air cylinder 904 is started to drive the inner shell 902 to rise in the outer shell 901, the inclined tube group 905 and the water collecting tank 920 are driven to rise to the water outlet position, the second water inlet pipe 906 is abutted with the third water inlet pipe 908, the second water inlet pipe 906 is connected to a high-pressure water source, the valve 907 is opened, high-pressure water flows from the second water inlet pipe 906 to the third water inlet pipe 908, the high-pressure water flows into the water distribution box 912 through the fourth water distribution pipe 909, the fifth water distribution pipe 910 and the front water pipe 911, water is sprayed to the spray heads 913 respectively, the rotary table 916 is driven by the starting motor 915, the rotary table 918 is driven to rotate around the axis of the rotary table 916, the other end of the rotary table a918 is driven to reciprocate the long groove 919 back and forth, the carriage 914 is driven to reciprocate in the inner shell 902, the front water pipe 911 is driven to slide reciprocally, the plurality of spray heads 913 are driven to slide reciprocally, and then the inclined pipe group 905 is fully washed, so that the whole-course automatic operation is carried out, the washing efficiency of the inclined pipe group 905 is high, and the manpower is saved.

It will be understood that the invention has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. The sewage treatment process is characterized by comprising the following steps of:

s1, flocculation treatment: the sewage flows into a reaction zone (4), and a flocculating agent is added into the reaction zone (4) so as to mix the flocculating agent with suspended matters in the sewage to obtain flocculates;

the sewage firstly flows into a central reaction cylinder (401) in the reaction zone (4), is mixed with the flocculating agent in the central reaction cylinder (401), and enters into the area between the central reaction cylinder (401) and the reaction zone (4) under the pushing of subsequent water inflow, so that the sewage, the flocculating agent and the mixed solution of the flocculating matter which flows back to the reaction zone (4) circulate inside and outside the central reaction cylinder (401);

s2, precipitation treatment: the sewage and the flocculate enter a precipitation zone (7) from the reaction zone (4) so as to separate and discharge the flocculate precipitation or reflux the flocculate to the reaction zone (4) to obtain clarified water;

s3, filtering: the denitrification deep bed filter (10) filters the clarified water in the sedimentation zone (7) and discharges and collects the clarified water;

further comprises dephosphorization and denitrification treatment: sewage enters an anaerobic tank (1) for anaerobic dephosphorization treatment and then enters an oxidation ditch tank (2) for nitrification denitrification treatment; after dephosphorization and denitrification treatment, the sewage is subjected to flocculation treatment;

the sewage treatment device comprises an anaerobic tank (1), an oxidation ditch tank (2), a water inlet pipe (3), a sewage treatment box (a) and an upper cover plate (5), wherein the upper end of the sewage treatment box (a) is fixedly connected with the upper cover plate (5), a baffle I (b) and a baffle II (c) are fixedly connected inside the sewage treatment box (a), the baffle I (b) and the baffle II (c) are arranged in parallel and are perpendicular to the sewage treatment box (a), the upper end of the baffle I (b) is fixedly connected to the top of the sewage treatment box (a), the lower end of the baffle I is fixedly connected with the bottom of the sewage treatment box (a) to form a transition zone, the lower end of the baffle II (c) is fixedly connected to the bottom of the sewage treatment box (a), the upper end of the baffle II (c) is fixedly connected with the top of the sewage treatment box (a) to form a transition zone (4), a transition zone and a sedimentation zone (7) by the baffle I (b) and the baffle II (c), the anaerobic tank (1) is fixedly connected with the oxidation ditch tank (2) through the oxidation ditch tank (2), and the other end of the anaerobic tank is fixedly connected with the water inlet pipe (3) from the bottom of the water inlet pipe (a);

a central reaction cylinder (401) and a stirring and discharging component (6) are arranged in the reaction zone (4), and the stirring and discharging component (6) rotates in the central reaction cylinder (401); the upper end and the lower end of the central reaction cylinder (401) are communicated with the reaction zone (4); the water inlet pipe (3) is inserted into the central reaction cylinder (401), and the stirring and discharging component (6) is fixedly connected to the upper cover plate (5);

the sedimentation zone (7) comprises a mud scraper drive (701), a first transmission rod (702), a mud scraper (703), grid bars (704), a mud discharge pipe (705), a mud return pipe (8) and a clarification component (9), wherein the mud scraper drive (701) is fixedly connected to the upper cover plate (5), the lower end of the mud scraper drive (701) is fixedly connected with one end of the first transmission rod (702), the other end of the first transmission rod (702) is fixedly connected to the mud scraper (703), the mud scraper (703) is in sliding connection with the bottom of a sewage treatment box (a), a plurality of grid bars (704) are vertically fixed at the upper end of the mud scraper (703), one end of the mud discharge pipe (705) is fixedly connected to the bottom of the sewage treatment box (a), the other end of the mud discharge pipe (705) is connected to the mud pump, the upper part of the sedimentation zone (7) is provided with the clarification component (9), one end of the clarification component (9) is fixed to the upper end of the sewage treatment box (a), one end of the mud return pipe (8) is inserted into the sedimentation zone (7) from the bottom of the sewage treatment box (a), the other end of the mud return pipe (8) is fixedly connected to the bottom of the sewage treatment box (a), and the other end of the mud return pipe (8) is provided with a variable frequency mud return pipe (801), and the mud return pipe (801) is provided with a variable frequency mud pump;

the upper end of one side of the sewage treatment box (a) close to the sedimentation area (7) is connected with a denitrification deep bed filter (10);

the stirring and blanking component (6) comprises a stirrer driver (601), the stirrer driver (601) is fixedly connected with an upper cover plate (5), the lower end of the stirrer driver (601) is fixedly connected with a first rotating wheel (602), the first rotating wheel (602) is in transmission connection with a second rotating wheel (604) through a belt (603), the second rotating wheel (604) is in rotation connection with the upper cover plate (5), the lower end of the second rotating wheel (604) is fixedly connected with a connecting pipe (605), the lower end of the connecting pipe (605) is fixedly connected with a stirrer head (606), the stirrer head (606) is rotationally connected with three stirring blades (607) along the circumferential direction of the connecting pipe (605), an inner rotating rod (608) is rotationally connected with the connecting pipe (605), the lower end of the inner rotating rod (608) is in gear transmission with the three stirring blades (607), the lower end of the upper cover plate (5) is respectively fixed with one end of three support rods (609), three support rods (609) are fixed with three outer disc frames (610) one by one, three pinch roller supports (611) are sequentially fixed in the middle of the pinch roller (605) from top to bottom, the inner side (612) is rotationally connected with the pinch roller supports (613), each pinch roller frame (612) is rotationally connected with the inner side (613) by three pinch rollers (613), the inner side hose (612) and the three pinch roller frames (610) are respectively) are deformed, one end of each of the three hoses (613) is positioned at the upper end of each of the three stirring blades (607), the other ends of the three hoses (613) are connected to the bottom end of a charging barrel (614), the charging barrels (614) are fixedly connected to the upper cover plate (5), flocculating agents are stored in the charging barrels (614), the circle center of the stirrer head (606) is consistent with that of the central reaction barrel (401), and the stirrer head (606) is positioned in the central reaction barrel (401);

when the stirrer drives (601) to stop moving, a rotary knob at the upper end of the inner rotary rod (608) is rotated to drive the inner rotary rod (608) to rotate, bevel gears at the lower end of the rotary rod (608) respectively drive bevel gears at the ends of the three stirring blades (607) to rotate to drive the three stirring blades (607) to rotate, and the contact area between the three stirring blades (607) and sewage during stirring is changed;

the clarifying component (9) comprises an outer shell (901), an inner shell (902) is connected inside the outer shell (901) in a sliding manner, an opening is formed in the top end of the outer shell (901), a water outlet (903) is formed in the upper end of one side of the outer shell (901), the lower end of the outer shell (901) is connected with a first cylinder (904), the upper end of the first cylinder (904) is connected with the inner shell (902), an inclined tube group (905) is connected inside the inner shell (902) in a sliding manner, a second water inlet tube (906) is fixedly connected to the upper end of the outer shell (901), a valve (907) is connected in a rotating manner to the second water inlet tube (906), a third water tube (908) is fixedly connected to the upper end of the inner shell (902), the third water pipe (908) is in sliding connection with the fourth water pipe (909), the fourth water pipe (909) is in sliding connection with the fifth water pipe (910), the fifth water pipe (910) is in sliding connection with the front water pipe (911), the front water pipe (911) is fixedly connected with the water diversion box (912), the water diversion box (912) is fixedly connected with the plurality of spray heads (913), the front water pipe (911) is fixedly connected with the sliding frame (914), the sliding frame (914) is in sliding connection on the inner shell (902), the upper end of the sliding frame (914) is fixedly connected with the long groove (919), the upper end of the inner shell (902) is fixedly connected with the water collecting groove (920), the opening position of the water collecting groove (920) corresponds to the water outlet (903), the lower end of the water collecting tank (920) is fixedly connected with a motor (915), a turntable (916) is fixedly connected below the motor (915), the center position of the turntable (916) is fixedly connected with one end of a rotating rod a (918) through a connecting rod, the other end of the rotating rod a (918) is convexly arranged in a notch of a long groove (919), the connecting rod between the turntable (916) and the rotating rod a (918) is rotationally connected to a supporting rod (917), two ends of the supporting rod (917) are fixedly connected in the inner shell (902), double-layer water inlet edges (921) are arranged at the edges of two sides of the water collecting tank (920), and two rows of convex teeth of the double-layer water inlet edges (921) are alternately arranged;

when the inclined tube group 905 is in a blocking state, the first starting cylinder (904) drives the inner shell (902) to ascend in the outer shell (901), the inclined tube group (905) and the water collecting tank (920) are driven to ascend to the water outlet position, the second water inlet pipe (906) is in butt joint with the third water inlet pipe (908), and the second water inlet pipe (906) is connected to a high-pressure water source.

2. The sewage treatment process according to claim 1, wherein in the flocculation treatment, the stirring and discharging part (6) is controlled to stir and mix the sewage and the flocculant while adding the flocculant into the reaction zone (4).

3. A sewage treatment process according to claim 1, wherein in the s2 sedimentation treatment, when sewage and flocculate enter the sedimentation zone (7) from the reaction zone (4), the sewage is blocked by the first baffle (b) and the second baffle (c) in sequence, and enters the sedimentation zone (7) through a transition zone formed between the first baffle (b) and the second baffle (c).

4. A sewage treatment process according to claim 1, wherein in the s2 sedimentation treatment, after sewage and flocculate enter the sedimentation zone (7) from the reaction zone (4), the flocculate is sedimented to the bottom of the sedimentation zone (7) to form sludge, and the sedimented sludge is concentrated and scraped by a concentrating and sludge scraper.

5. A sewage treatment process according to claim 1, wherein in the s2 sedimentation treatment, after sewage and flocculate enter the sedimentation zone (7) from the reaction zone (4), part of the flocculate can be returned to the reaction zone (4) by a variable frequency return sludge pump (801) so that the flocculant carried in the return flocculate is mixed with the sewage.