CN114349089A

CN114349089A - Bury formula sewage pretreatment systems

Info

Publication number: CN114349089A
Application number: CN202210015722.9A
Authority: CN
Inventors: 何京钟; 孙竟; 刘羿; 柴玉峰; 肖波; 易洋
Original assignee: CSCEC Scimee Sci and Tech Co Ltd
Current assignee: CSCEC Scimee Sci and Tech Co Ltd
Priority date: 2022-01-07
Filing date: 2022-01-07
Publication date: 2022-04-15
Anticipated expiration: 2042-01-07
Also published as: CN114349089B

Abstract

The invention relates to a buried sewage pretreatment system which comprises a tank body, an oxygen supply module and a controller, wherein a regulating reservoir and a sludge reservoir are constructed in the tank body, the regulating reservoir and the sludge reservoir are mutually isolated by a first partition plate and are communicated through a backflow hole, and a one-way control part is arranged at the backflow hole and is used for enabling the sludge reservoir and the regulating reservoir to be communicated in one way; the oxygen supply module comprises an oxygen supply pipe arranged in the sludge tank, an air inlet pipe communicated with the oxygen supply pipe and a first control valve, and the oxygen supply pipe is provided with a plurality of exhaust holes; the controller is electrically connected with the first control valve and is used for controlling the oxygen supply module to supply oxygen to the sludge tank intermittently; the system can realize the clear liquid self-refluxing function, not only can reduce the sludge amount of the sludge tank and effectively reduce the cleaning frequency and cost, but also can effectively adjust the carbon-nitrogen proportion in the front-end pretreated sewage to achieve the purpose of increasing the carbon source, is more favorable for subsequent biochemical treatment, and is particularly suitable for treating rural sewage.

Description

Bury formula sewage pretreatment systems

Technical Field

The invention relates to the technical field of small buried rural sewage treatment, in particular to a buried sewage pretreatment system.

Background

Due to large fluctuation of water quality and water quantity, a small-scale distributed sewage treatment station (such as a buried sewage pretreatment system for treating rural sewage) generally needs to be provided with a buried adjusting tank (buried adjusting equipment) to carry out homogenization and uniform adjustment on sewage, namely, the sewage to be treated is pretreated, and the regulated sewage enters rear-end biochemical treatment equipment; because the short-term sludge production amount of the small-sized station is small, in the sewage treatment process, the sludge produced by the biochemical treatment equipment for a long time needs to be discharged to a sludge tank for storage so as to be cleaned and transported regularly at the later stage.

The prior art has the problems that on one hand, at the rear end of biochemical treatment equipment, discharged excess sludge is stored in a sludge tank, and the water content of the sludge discharged from the biochemical treatment equipment is higher and is usually more than 98 percent, so that the utilization rate of the volume of the sludge tank is low; meanwhile, most rural sewage and other distributed sewage stations are remote and narrow, so that the sludge is difficult to clean and treat, and the treatment cost is high; on the other hand, at the front end of the biochemical treatment equipment, most rural sewage entering the regulating tank has serious carbon-nitrogen ratio imbalance, the cost of adding a carbon source is high, the rural sewage is not suitable for being used, the residual sludge is used as a good carbon source, the decomposed small molecular substances are used as the carbon source of raw water, the operation and maintenance cost can be reduced, and if the residual sludge is directly discharged into the raw water without being treated, the SS (suspended solid) of the raw water is high, the utilization rate of the carbon source is low, and the treatment function of the subsequent biochemical treatment equipment is deteriorated; due to the two reasons, when the existing buried sewage pretreatment system is used for treating rural sewage, the problems that the carbon-nitrogen ratio of the sewage after front-end pretreatment is seriously unbalanced, the sludge amount generated by rear-end biochemical treatment is large, the clearing frequency is high, and the operation and maintenance cost is high exist, and urgent needs to be solved.

Disclosure of Invention

The invention aims to solve the problems that when the existing buried sewage pretreatment system is used for treating rural sewage, the carbon-nitrogen ratio of the sewage after front-end pretreatment is seriously unbalanced, and the sludge amount generated by rear-end biochemical treatment is large, the clearing frequency is high, and the cost is high, and provides a buried sewage pretreatment system suitable for treating rural sewage, which can realize the function of clear liquid self-flowing backflow, not only can reduce the sludge amount in a sludge tank, thereby effectively reducing the clearing frequency and the cost, but also can effectively adjust the carbon-nitrogen ratio in the sewage of front-end pretreatment, achieve the purpose of increasing a carbon source, and is more favorable for subsequent biochemical treatment, and the main conception is as follows:

a buried sewage pretreatment system comprises a tank body, an oxygen supply module and a controller, wherein,

the tank body is internally provided with a regulating tank for storing sewage and a sludge tank for storing sludge, the regulating tank and the sludge tank are mutually isolated through a first partition plate, the first partition plate is provided with a return hole for communicating the regulating tank and the sludge tank, and the return hole is provided with a one-way control component for enabling the sludge tank and the regulating tank to be communicated in one way;

the oxygen supply module comprises an oxygen supply pipe arranged in the sludge tank, an air inlet pipe communicated with the oxygen supply pipe and a first control valve, the air inlet pipe is used for communicating with the gas supercharger, and the oxygen supply pipe is provided with a plurality of exhaust holes;

the controller is electrically connected with the first control valve and is used for controlling the first control valve to open/close so as to control the oxygen supply module to supply oxygen to the sludge tank intermittently. In the scheme, the regulating tank and the sludge tank are constructed in the same tank body, so that the structure can be simplified, the sludge tank is more convenient to bury, and the regulating tank and the sludge tank can be communicated in one direction through the backflow hole so as to be matched with each other for use; the regulating tank for storing sewage is constructed, so that the sewage can be homogenized and uniformly regulated, and the regulated sewage enters subsequent biochemical treatment equipment for biochemical treatment, so that the problem of large water quality and large water quantity fluctuation of rural sewage can be solved; by arranging the oxygen supply module and communicating the gas supercharger by utilizing the air inlet pipe, the gas supercharger can convey oxygen into the sludge tank through the air inlet pipe, the oxygen supply pipe and the exhaust hole, and the controller controls the opening/closing of the first control valve, so that intermittent aeration can be realized in the sludge tank in the actual operation process, an anoxic-aerobic alternative environment can be built in the sludge tank, the endogenous metabolism of sludge in the sludge tank is forced, the sludge reduction is realized after cell dissolution and oxidative decomposition, and the problem of sludge reduction in the sludge tank can be solved; specifically, the sludge firstly enters an anoxic stage to generate a denitrification process to generate certain alkalinity, then organic acid generated in a sludge decomposition process in an aeration stage can be effectively neutralized, and finally enters anoxic accumulated alkalinity, and the steps are circulated and repeated in such a way, so that the sludge is effectively reduced; in the process, nutrients after sludge decomposition are released and enter the supernatant, and the supernatant can flow back into the regulating reservoir through the backflow hole, so that a carbon source in the regulating reservoir can be effectively supplemented, the phenomenon that the carbon-nitrogen ratio of sewage to be treated is seriously unbalanced is avoided, the problem that the carbon-nitrogen ratio of the sewage after front-end pretreatment is seriously unbalanced can be solved, and the sludge in the sludge reservoir can be concentrated, namely, the system can achieve the purposes of sludge reduction, concentration and carbon source recovery of the sludge reservoir of the small-sized sewage treatment station; in addition, in this scheme, through set up the one-way control part in return flow hole department for sludge impoundment and equalizing basin can only one-way intercommunication, not only can realize the function of flowing back certainly of supernatant in the sludge impoundment, can solve moreover because the water yield fluctuation of incoming flow sewage is big, lead to the problem of the sewage refluence to appear easily, prevent that the sewage in the equalizing basin is direct to flow into in the sludge impoundment through the return flow hole, thereby can satisfy the demand of various operating modes.

For solving the aeration in-process, mud in the mud pond can flow into the problem of equalizing basin via the backward flow hole, and is further, still including being used for monitoring the level sensor of liquid level height in the mud pond, level sensor with the controller electricity is connected, and the liquid level height that gathers when level sensor is higher than during the lower limb of backward flow hole, the first control valve of controller control is closed, and the liquid level height that gathers when level sensor equals or is less than during the lower limb of backward flow hole, controller control oxygen suppliment module is to mud pond internal intermittent type nature oxygen suppliment. In the scheme, the liquid level sensor is arranged, so that the real-time liquid level height in the sludge tank can be effectively monitored, whether aeration is performed or not can be judged according to the real-time liquid level height number, on one hand, when the liquid level collected by the liquid level sensor is higher than the lower edge of the backflow hole, the controller controls the first control valve to be closed, the whole oxygen supply module cannot perform aeration in the sludge tank, and therefore sludge is effectively prevented from floating upwards due to aeration and flowing into the regulating tank through the backflow hole; at the moment, the supernatant in the sludge tank can automatically flow back into the regulating tank through the return hole, so that the purposes of sludge concentration and sludge reduction are achieved; on the other hand, when the liquid level height collected by the liquid level sensor is equal to or lower than the lower edge of the backflow hole, the controller can control the oxygen supply module to perform intermittent aeration so as to create an anoxic-aerobic alternative environment in the sludge tank and achieve the purpose of sludge reduction.

For solving the problem of the one-way intercommunication of sludge impoundment and equalizing basin, it is preferred, the one-way control part includes removable cover, removable cover's upper end swing joint in first baffle, and removable cover set up in the equalizing basin, removable cover seals under the effect of self weight the backward flow hole. The upper end of the movable cover plate is movably connected with the first partition plate, so that the lower end of the movable cover plate can freely droop and just seal the backflow hole under the action of the self weight, and the movable first partition plate is arranged in the adjusting tank, so that the movable cover plate is always in a closed state no matter how high the liquid level of the adjusting tank is, and the sewage in the adjusting tank can be effectively prevented from flowing back into the sludge tank; and when the liquid level height of sludge impoundment is higher than the backward flow hole, and the sewage in the equalizing basin is less than the backward flow hole, under the effect of unilateral pressure, removable cover can open automatically for supernatant can advance the equalizing basin via the backward flow hole backward flow automatically in the sludge impoundment, when the liquid level height of sludge impoundment is higher than the height of backward flow hole, the pressure differential disappears, removable cover self-closing under the action of gravity of self, thereby reach the purpose of sludge impoundment and the one-way intercommunication of equalizing basin.

Preferably, the movable cover plate is connected to the first partition plate through a hinge; and/or a sealing ring is arranged between the movable cover plate and the first partition plate. In order to achieve a better sealing effect.

Preferably, the controller is a single chip microcomputer, a PC (personal computer) or a PLC (programmable logic controller).

In order to solve the problem of being convenient for clear up mud in the mud pond, furtherly, jar body still is provided with first manhole, first manhole structure in corresponding the position department of mud pond, and with the mud pond is linked together. By configuring the first manhole, a worker can clean sludge in the sludge tank through the first manhole regularly in practical use.

In order to facilitate assembly and maintenance, the tank body is further provided with a second manhole, and the second manhole is constructed at a position corresponding to the regulating tank and is communicated with the regulating tank.

Further, the lateral wall of first manhole is constructed with the first joint that is used for connecting the gas transmission pipeline and is used for connecting the second joint of arranging the mud pipeline, the intake pipe with the first joint is linked together, the second connect through advance the mud pipe with the sludge impoundment is linked together. By adopting the design, the arrangement and the assembly of the air inlet pipe and the mud inlet pipe are convenient, and the field installation and the subsequent overhaul are convenient.

Furthermore, the side wall of the second manhole is provided with a third joint for connecting a water outlet pipeline, the lift pump is installed in the regulating reservoir, and the water outlet end of the lift pump is communicated with the third joint through a water outlet pipe. Not only is beneficial to the structure to be more compact, but also is convenient to install, maintain and overhaul.

In order to solve the problem of preventing impurities in the sewage from being hardened at the bottom of the regulating reservoir, the sewage treatment device further comprises a stirring module, the stirring module comprises a stirring pipe arranged in the regulating reservoir, an air guide pipe communicated with the stirring pipe and a second controller valve, the air guide pipe is used for communicating with a gas booster, the stirring pipe is provided with a plurality of exhaust holes,

the controller is electrically connected with the second control valve and is used for controlling the opening/closing of the second control valve so as to control the gas to be delivered into/not to the regulating reservoir. In this scheme, through set up the stirring module in the equalizing basin, and can utilize the gaseous booster of air duct intercommunication, make gaseous booster can be via the air duct, stirring pipe and exhaust port are to the intrapond carrier gas, get into the gas in the equalizing basin, can drive the sewage motion in the equalizing basin, not only can prevent that a large amount of carbon source material from sinking the end, make sewage in the equalizing basin can the misce bene, the realization carries out the purpose of even quenching and tempering to sewage, and can effectively prevent the suspended solid in the sewage, the phenomenon that the end hardened and impervioussion appears in the bottom of equalizing basin in impurity such as grit, and can effectively prevent the jam problem that the appearance hardens because of the end of impurity sinking.

Preferably, the side wall of the second manhole is further configured with a fourth joint for connecting a gas pipeline, and the gas guide pipe is communicated with the fourth joint.

In order to solve the sewage pretreatment process, the problem of intercepting impurities with density greater than that of water in sewage and impurities with density less than that of water such as oil stains is further solved, a slag blocking tank is further constructed in the tank body, the slag blocking tank is separated from the regulating tank through a second partition plate, the slag blocking tank is communicated with a water passing hole formed in the second partition plate, the water passing hole is spaced from the bottom of the slag blocking tank by a set distance, the second partition plate below the water passing hole is used for blocking slag, and the second partition plate above the water passing hole is used for intercepting oil stains. In this scheme, the upstream of equalizing basin still is constructed and is blocked the sediment pond to will cross the water hole and construct in the distance and block the position department of sediment bottom take the altitude, when in actual use, block in the sediment pond sewage and be higher than cross the water hole, make the sewage that blocks in the sediment pond can get into subsequent equalizing basin via crossing the water hole, at this in-process, the second baffle of crossing the water hole below can effectively block the grit in the sewage, the fibrous matter isopycnic is greater than the impurity of water, thereby effectively prevent these impurities from getting into subsequent equalizing basin, avoid appearing the problem that the heavy end hardens in the equalizing basin, simultaneously, the second baffle of crossing the water hole top can effectively intercept the impurity that floats in the sewage surface such as greasy dirt, reach the purpose of effectively keeping apart light impurity such as greasy dirt.

Preferably, the water through hole is formed in the middle of the second separator. So that a sufficient settling space and a space for storing foreign matters are formed below the water passing hole.

Preferably, the water passing holes are rectangular holes. The liquid level is convenient to control.

In order to solve the problem of intercepting larger impurities in the sewage pretreatment process, the sewage pretreatment device further comprises a basket grid device, the tank body is provided with a third manhole which is communicated with the slag blocking tank,

the basket grid device is arranged in the slag blocking pool and corresponds to the third manhole, and the basket grid device is communicated with the water inlet pipe arranged in the tank body. Namely, the sewage in the input tank body firstly enters the basket grid device so as to intercept large impurities in the sewage by using the basket grid device, and sand, fiber and the like which are not intercepted and have the density larger than that of the water enter the slag intercepting pool along with the sewage and can be deposited in the slag intercepting pool, thereby realizing better slag intercepting effect.

In order to solve the problem that slag is easy to run out of an installation gap between a basket grid and a water inlet pipe, further, the basket grid device comprises an installation seat, a coupling seat, a guide mechanism and a basket grid which are fixedly installed on the tank body, wherein,

the mounting seat is provided with a first coupling surface, a first water inlet is formed in the first coupling surface and communicated with the water inlet pipe,

the coupling seat is provided with a second coupling surface matched with the first coupling surface, a second water inlet is formed in the second coupling surface, the basket grid is connected to the coupling seat and communicated with the second water inlet,

the guide mechanism comprises a guide part and an adaptive part, the guide part is arranged in the vertical direction, the adaptive part is matched with the guide part and connected with the mounting seat, the adaptive part is constructed on the coupling seat, and the adaptive part is restrained on the guide part and forms a moving pair with the guide part in the vertical direction;

the coupling seat can move between a first position and a second position, the first position is located below the second position, the mounting seat supports the coupling seat, the second coupling surface corresponds to the first coupling surface, and the second water inlet is communicated with the first water inlet. In the scheme, the mounting seat and the coupling seat are constructed, the basket grid is connected to the coupling seat, and the coupling seat is movably constrained on the mounting seat, so that the basket grid can move between a first position and a second position under the action of external force, and the first position is positioned below the second position, so that the basket grid can rise/fall under the action of external force, and the problem of cleaning grid slag in the basket grid is solved; the first coupling surface is constructed on the mounting seat, the second coupling surface matched with the first coupling surface is constructed on the coupling seat, and the first water inlet and the second water inlet are respectively constructed in the first coupling surface and the second coupling surface, so that when the coupling seat is at an initial position, namely a first position, the second coupling surface just corresponds to the first coupling surface, the second water inlet is communicated with the first water inlet, and the coupling seat is better attached to the mounting seat through the matching of the first coupling surface and the second coupling surface, so that a gap between the coupling seat and the mounting seat can be effectively reduced or even eliminated, and the problem of slag leakage can be effectively avoided; the second water inlet is communicated with the first water inlet, so that external sewage can enter the first water inlet through the water inlet pipe, enter the second water inlet through the first water inlet and finally continuously enter the basket grid through the second water inlet, and the problem of normal water inlet at the first position can be solved; for current hand-basket grid device, this hand-basket grid device's structure is compacter, and the design is more reasonable, can ensure that the problem of running the sediment can not appear between hand-basket grid and the inlet tube to effectively solve the problem that prior art exists.

Further comprises a biochemical treatment device for performing biochemical treatment on the sewage and a gas booster, wherein,

the adjusting tank is communicated with the water inlet end of the biochemical treatment equipment through a water outlet pipeline and is used for sending sewage into the biochemical treatment equipment, and the sludge output end of the biochemical treatment equipment is communicated with the sludge tank through a sludge discharge pipeline and is used for sending sludge into the sludge tank; the gas booster is communicated with the oxygen supply pipe through a gas transmission pipeline, and the gas booster adopts a gas pump or a gas station.

Compared with the prior art, the buried sewage pretreatment system provided by the invention can realize the function of clear liquid self-refluxing, not only can reduce the sludge amount of a sludge tank and effectively reduce the cleaning frequency and cost, but also can effectively adjust the carbon-nitrogen ratio in the front-end pretreated sewage to achieve the purpose of increasing the carbon source, is more beneficial to the subsequent biochemical treatment, and is particularly suitable for treating rural sewage.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a partial sectional view of a buried sewage pretreatment system according to embodiment 1 of the present invention.

Fig. 2 is a schematic view of a buried sewage pretreatment system, a biochemical treatment device, and a gas booster according to embodiment 1 of the present invention.

Fig. 3 is a schematic structural diagram of a buried sewage pretreatment system according to embodiment 2 of the present invention.

Fig. 4 is a cross-sectional view taken at a-a in fig. 3.

Fig. 5 is a schematic structural diagram of a buried sewage pretreatment system according to embodiment 3 of the present invention.

Fig. 6 is a schematic structural diagram of a mounting seat in a basket grid device according to embodiment 3 of the present invention.

Fig. 7 is a schematic structural view of a coupling seat and a basket grid in a basket grid device according to embodiment 3 of the present invention.

Fig. 8 is a schematic structural diagram of a basket grid device according to embodiment 3 of the present invention.

Fig. 9 is a front view of fig. 8 with the coupling seat and the basket grate in a first position.

Fig. 10 is a front view of fig. 8 with the coupling seat and the basket grate in a second position.

Fig. 11 is a partial cross-sectional view of fig. 9.

Description of the drawings

The device comprises a tank body 101, a regulating tank 102, a lifting pump 103, a water discharge pipe 104, a check valve 105, an oxygen supply pipe 106, an air inlet pipe 107, an air inlet pipe 108, a sludge tank 109, a first partition plate 110, a backflow hole 111, a movable cover plate 112, a first control valve 113, a second control valve 114, a controller 115, a stirring pipe 116 and an air guide pipe 117

The manhole comprises a first manhole 201, a second manhole 202, a barrel 203, a flange 204, a manhole cover 205, a falling prevention net 206, a first joint 207, a second joint 208, a third joint 209, a fourth joint 210, a third manhole 211 and a shaft 212

Level sensor 300

Gas booster 400 and gas transmission pipeline 401

Biochemical treatment equipment 500, water outlet pipeline 501 and sludge discharge pipeline 502

Slag blocking tank 601, second partition plate 602 and water through holes 603

Mounting seat 700, bottom plate 701, first coupling plate 702, first coupling surface 703, first water inlet 704, supporting plate 705, mounting cylinder 706 and guide rod 707

Coupling seat 800, second coupling plate 801, second coupling surface 802, second water inlet 803, guide plate 804, guide notch 805 and connecting cylinder 806

A basket grid 900, a grid hole 901, a top plate 902, a hinge 903, a latch 904, a hanging lug 905, an inlet 906 and a flap 907.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1 and 2, the present embodiment provides a buried sewage pretreatment system, which includes a tank 101, a lift pump 103, an oxygen supply module, and a controller 115, wherein,

the tank body 101 may be a round tank or a square tank, as shown in fig. 1 and 2, the material of the tank body 101 may be carbon steel, glass fiber reinforced plastic or other high-strength material so as to be buried in the ground; a regulating reservoir 102 for storing sewage and a sludge reservoir 109 for storing sludge are constructed in the tank body 101, the regulating reservoir 102 is mainly used for homogenizing and uniformly regulating rural sewage with large water quality and water quantity fluctuation, the regulating reservoir 102 is communicated with subsequent biochemical treatment equipment 500, so that the regulated sewage can enter the subsequent biochemical treatment equipment 500 for biochemical treatment, as shown in fig. 2, therefore, the input end of the lifting pump 103 is communicated with the regulating reservoir 102, and the output end is communicated with the biochemical treatment equipment 500 through a drain pipe 104, so that the sewage in the regulating reservoir 102 can be conveyed out; the sludge tank 109 needs to be communicated with a sludge discharge port of the biochemical treatment equipment 500 and is mainly used for storing sludge generated by long-time operation of the biochemical treatment equipment 500 so as to be cleaned regularly at a later stage;

as shown in fig. 1, in this embodiment, the adjusting tank 102 and the sludge tank 109 can be isolated from each other by a first partition plate 110, the first partition plate 110 is provided with a return hole 111 for communicating the adjusting tank 102 and the sludge tank 109, as shown in fig. 1 and fig. 2, a one-way control component is arranged at the return hole 111, the one-way control component is used for enabling the sludge tank 109 and the adjusting tank 102 to be communicated in one way, so that the sludge tank 109 and the adjusting tank 102 can only be communicated in one way, not only can the self-return function of supernatant in the sludge tank 109 be realized, but also the problem of easy sewage backflow caused by uncertain sewage amount and large water fluctuation entering the adjusting tank 102 can be solved by arranging the one-way control component, so that the problem of sewage backflow in the adjusting tank 102 can be prevented from directly flowing into the sludge tank 109 through the return hole 111, thereby the problem of sewage backflow can be solved, the requirements of various working conditions can be satisfied, and is particularly suitable for rainy seasons with large sewage flow, the problem that the liquid level of the adjusting tank 102 is higher than the backflow hole 111 and flows backwards in rainy seasons due to large fluctuation of the amount of sewage can be effectively solved.

In this embodiment, the oxygen supply module includes an oxygen supply pipe 106 disposed in the sludge tank 109, an air inlet pipe 107 communicated with the oxygen supply pipe 106, and a first control valve 113, as shown in fig. 1 and fig. 2, the air inlet pipe 107 is used to communicate with an external air supercharger 400, the air supercharger 400 may be an air pump or an air station, and the like, and is used to output gas containing oxygen, such as air, oxygen, and the like, in this embodiment, the oxygen supply pipe 106 is configured with a plurality of exhaust holes, so that the oxygen supply pipe 106 may be communicated with the sludge tank 109 through the exhaust holes, as shown in fig. 1, in a specific implementation, the aperture of the exhaust holes may be determined according to an actual requirement, the exhaust holes may be distributed along a length direction of the oxygen supply pipe 106, and the exhaust holes may be downward opened along an oblique downward direction of 45 degrees to prevent the exhaust holes from being blocked; the oxygen supply pipe 106 may be preferably installed at a position near the bottom of the sludge tank 109 to achieve a better oxygen supply effect.

In this embodiment, the controller 115 is electrically connected to the first control valve 113, and is configured to control the first control valve 113 to open/close, and the first control valve 113 is configured to control the on/off of the exhaust hole, so that the controller 115 may control the oxygen supply module to intermittently supply oxygen to the sludge tank 109; by arranging the oxygen supply module and communicating the gas booster 400 by using the air inlet pipe 107, the gas booster 400 can convey oxygen into the sludge tank 109 through the air inlet pipe 107, the oxygen supply pipe 106 and the exhaust hole, and the controller 115 controls the opening/closing of the first control valve 113, so that in the actual operation process, intermittent aeration can be realized in the sludge tank 109, an anoxic-aerobic alternative environment can be created in the sludge tank 109, the endogenous metabolism of the sludge in the sludge tank 109 is forced, the sludge reduction is realized after cell dissolution and oxidative decomposition, and the problem of sludge reduction in the sludge tank 109 can be solved; specifically, the sludge firstly enters an anoxic stage, denitrification process is carried out on residual nitrate to generate certain alkalinity, then organic acid generated in the sludge decomposition process in the aeration stage can be effectively neutralized, and finally the sludge enters anoxic accumulated alkalinity, and the steps are circulated and repeated, so that the effective reduction of the sludge is realized; in the process, micromolecular nutrients after sludge decomposition are released to enter supernatant, and the supernatant can flow back into the regulating reservoir 102 through the backflow hole 111, so that a carbon source in the regulating reservoir 102 can be effectively supplemented, the problem that the carbon-nitrogen ratio of sewage to be treated is seriously unbalanced is relieved, and the sludge in the sludge reservoir 109 can be concentrated, namely, the system can achieve the purposes of sludge reduction, concentration and carbon source recovery of the sludge reservoir 109 of the small sewage treatment station, and is particularly suitable for treating rural sewage.

According to the previous experimental results, as shown in table 1, in the operation process of the system, the dissolved oxygen in the anoxic stage and the dissolved oxygen in the aerobic stage can be respectively controlled to be about 0.5mg/L and 5mg/L, the intermittent time is controlled according to the dissolved oxygen, and after the intermittent anoxic-aerobic operation, the sludge can be reduced by more than 50%, so that the cleaning and transportation frequency of the sludge can be greatly reduced; in specific implementation, the controller 115 may be a single chip, a PC, a PLC, or the like.

TABLE 1 sludge reduction effect for 30 days at different dissolved oxygen concentrations

Controlling dissolved oxygen (anoxic/aerobic)	Sludge reduction rate of 30d
		0.5/2	27.4%
0.5/4	35.8%
		0.5/5	50.5%
0.5/6	50.3%

In order to facilitate accurate control of the reflux process, the system further comprises a liquid level sensor 300 for monitoring the liquid level height in the sludge tank 109, wherein the liquid level sensor 300 is electrically connected with the controller 115, as shown in fig. 1 and 2, the liquid level sensor 300 is arranged, so that the real-time liquid level height in the sludge tank 109 can be effectively monitored, and whether aeration is carried out or not can be judged according to the real-time liquid level height number; on one hand, when the liquid level collected by the liquid level sensor 300 is higher than the lower edge of the return hole 111, the controller 115 may control the first control valve 113 to close, so that the whole oxygen supply module does not aerate in the sludge tank 109, thereby effectively preventing the aeration from causing the sludge to float upwards and flow into the adjusting tank 102 through the return hole 111; at the moment, the supernatant in the sludge tank 109 can automatically flow back into the regulating tank 102 through the return hole 111, so that the purposes of sludge concentration and sludge reduction are achieved; on the other hand, when the liquid level height collected by the liquid level sensor 300 is equal to or lower than the lower edge of the return hole 111, the controller 115 may control the oxygen supply module to intermittently supply oxygen to the sludge tank 109, so as to realize intermittent aeration, so as to create an anoxic-aerobic alternate environment in the sludge tank 109, thereby achieving the purpose of sludge reduction.

The height of the reflow hole 111 is determined according to actual requirements, and is generally configured at the upper portion of the first separator 110, as shown in fig. 1 and 2, and the reflow hole 111 may be a square hole or a round hole, which is convenient for molding.

In this embodiment, the first control valve 113 may preferably be a controllable valve such as an electromagnetic valve, so as to operate under the control of the controller 115, and the first control valve 113 may be mounted on the intake pipe 107, or may be mounted on a gas transmission pipeline 401 communicating with the intake pipe 107, as shown in fig. 1 and 2.

In order to realize the one-way communication between the sludge tank 109 and the adjusting tank 102, the one-way control component has various embodiments, by way of example, the one-way control component may adopt a one-way valve commonly used in the prior art, and preferably, in the present embodiment, the one-way control component includes a movable cover plate 112, an upper end of the movable cover plate 112 is movably connected to the first partition plate 110, and the movable cover plate 112 is disposed in the adjusting tank 102, and the movable cover plate 112 may close the backflow hole 111 under the action of its own weight, as shown in fig. 1 and 2, the movable cover plate 112 may be connected to the first partition plate 110 by a hinge structure such as a hinge 903, so that the movable cover plate 112 has a degree of freedom of rotation, since the upper end of the movable cover plate 112 is movably connected to the first partition plate 110, a lower end of the movable cover plate 112 may freely hang down and just close the backflow hole 111, and since the movable first partition plate 110 is disposed in the adjusting tank 102, no matter how high the liquid level of the adjusting tank 102 is, the movable cover plate 112 is always in a closed state, so that the sewage in the adjusting tank 102 can be effectively prevented from flowing back into the sludge tank 109; and when the liquid level height of sludge impoundment 109 is higher than return opening 111, and the sewage in the equalizing basin 102 is less than return opening 111, under the effect of unilateral pressure, removable cover 112 can open automatically, make the interior supernatant of sludge impoundment 109 can flow back into equalizing basin 102 via return opening 111 automatically, when the liquid level height of sludge impoundment 109 is higher than the height of return opening 111, the pressure differential disappears, removable cover 112 self-closing under the action of gravity of self, thereby reach the purpose of sludge impoundment 109 and equalizing basin 102 one-way intercommunication.

In a more perfect scheme, a sealing ring is further arranged between the movable cover plate 112 and the first partition plate 110, so as to achieve a better sealing effect.

In order to clean the sludge in the sludge tank 109 conveniently, in a more sophisticated scheme, as shown in fig. 1 and fig. 2, the tank 101 is further provided with a first manhole 201, the first manhole 201 is configured at a position corresponding to the sludge tank 109 and is communicated with the sludge tank 109, as shown in fig. 1, by configuring the first manhole 201, a worker can clean the sludge in the sludge tank 109 through the first manhole 201 regularly during actual use; in this embodiment, as shown in fig. 1, the first manhole 201 comprises a cylinder 203 and a manhole cover 205 with a handle, the manhole cover 205 is connected to one end of the cylinder 203, and the other end of the cylinder 203 is configured with a flange 204, the first manhole 201 can be connected to the tank 101 through the flange 204, and can also be connected to a shaft 212 through the flange 204, the lower end of the shaft 212 is connected to the tank 101 through the flange 204, as shown in fig. 1, at this time, the first manhole 201 can be a standard component, and the height of the shaft 212 can be determined according to actual requirements, so that the tank 101 can be buried at a set depth underground, and the manhole cover 205 can be located at a position on the ground or above the ground, and in a more sophisticated scheme, an anti-falling net 206 is further installed in the first manhole 201, as shown in fig. 1.

In a further embodiment, the sidewall of the first manhole 201 is further configured with a first connector 207 for connecting the gas pipeline 401 and a second connector 208 for connecting the sludge discharge pipeline 502, as shown in fig. 1, the gas inlet pipe 107 is communicated with the first connector 207, and the second connector 208 is communicated with the sludge tank 109 through a sludge inlet pipe, as shown in fig. 1.

Similarly, in a more sophisticated solution, as shown in fig. 1, the tank body 101 is further provided with a second manhole 202, and the second manhole 202 is configured at a position corresponding to the regulation tank 102 and is communicated with the regulation tank 102; the structure of the second manhole 202 can be the same as that of the first manhole 201, and the position and size can be different, for example, as shown in fig. 1, the first manhole 201 comprises a cylinder 203 and a manhole cover 205 with a handle, the manhole cover 205 is connected to one end of the cylinder 203, the other end of the cylinder 203 is configured with a flange 204, the second manhole 202 can be directly connected to the tank 101 through the flange 204, and can also be connected to a shaft 212 through the flange 204, the lower end of the shaft 212 is connected to the tank 101 through the flange 204, as shown in fig. 1, in this case, the second manhole 202 can be a standard component, and the height of the shaft 212 can be determined according to actual requirements, and in a more sophisticated scheme, a falling prevention net 206 is further installed in the second manhole 202, as shown in fig. 1.

In order to facilitate the output of the sewage in the regulation tank 102, in a further embodiment, the sidewall of the second manhole 202 is further configured with a third joint 209 for connecting with an outlet pipe 501, the lift pump 103 can be installed in the regulation tank 102, as shown in fig. 1, the outlet end of the lift pump 103 is communicated with the third joint 209 through the outlet pipe 104, when actually installed, the lift pump 103 can be used and disposed at a position higher than the bottom 100 and 500mm of the regulation tank 102 according to the situation so as to prevent the sucking of the non-intercepted bottom-sinking impurities, the outlet pipe 104 is further provided with a check valve 105, and the outside is further provided with a return pipe to control the flow rate of the water to be more convenient for being matched with the biochemical treatment equipment 500.

In order to prevent impurities in the sewage from being deposited on the bottom plate 701 at the bottom of the regulating reservoir 102, in a more complete scheme, the system further includes a stirring module, the stirring module includes a stirring pipe 116 disposed in the regulating reservoir 102, an air duct 117 communicated with the stirring pipe 116, and a second controller 115 valve, as shown in fig. 1 and 2, the air duct 117 is used for communicating with the gas booster 400, the stirring pipe 116 is configured with a plurality of exhaust holes, and the arrangement manner of the exhaust holes may be the same as that of the exhaust holes in the oxygen supply pipe 106, which is not described again; the second control valve 114 may preferably be a solenoid valve, and the second control valve 114 may be disposed on the air duct 117 or an air duct 401 communicated with the air duct 117, as shown in fig. 1 and 2.

In the present embodiment, the controller 115 is electrically connected to the second control valve 114, and is configured to control the second control valve 114 to open/close so as to control whether to deliver gas into the regulating reservoir 102; during the in-service use, gaseous booster 400 can be via the air duct 117, conveying gas in agitator pipe 116 and the exhaust port is to equalizing basin 102, get into the gas in the equalizing basin 102, can drive the sewage motion in the equalizing basin 102, not only can prevent that a large amount of carbon source material from sinking the end, make the sewage in the equalizing basin 102 can the misce bene, the realization carries out the purpose of even quenching and tempering to sewage, and can effectively prevent the suspended solid in the sewage, the phenomenon that bottom plate 701 knot appears in the bottom of equalizing basin 102 in impurity such as grit, and can effectively prevent the jam problem that appears because of impurity bottom plate 701 knot.

Accordingly, for the convenience of assembly, as shown in fig. 1 and 2, the sidewall of the second manhole 202 is further configured with a fourth connector 210 for connecting a gas pipeline 401, and the gas guide tube 117 communicates with the fourth connector 210.

Example 2

Because the adjusting tank 102 in the system is mainly used for pretreatment of sewage, and in order to solve the problem that impurities with density higher than that of water, oil stains and the like and less than that of water in sewage are intercepted in the sewage pretreatment process, on the basis of embodiment 1, in the buried sewage pretreatment system provided by embodiment 2, a slag blocking tank 601 is further configured in the tank body 101, the slag blocking tank 601 and the adjusting tank 102 are separated by a second partition plate 602 and are communicated through a water through hole 603 configured on the second partition plate 602, as shown in fig. 3 and 4, and the water through hole 603 and the bottom of the slag blocking tank 601 have a set distance, preferably, the water through hole 603 can be configured in the middle of the second partition plate 602 so as to form a sufficient settling space and a space for storing impurities below the water through hole 603, and in the actual operation process, the second partition plate 602 below the water through hole 603 is used for blocking slag, the second partition plate 602 above the water through hole 603 is used for intercepting oil stains, specifically, in the actual operation process, the sewage in the slag blocking tank 601 is higher than the water through hole 603, as shown in fig. 3 and 4, so that the sewage in the slag blocking tank 601 can enter the subsequent regulating tank 102 through the water through hole 603, in this process, the second partition plate 602 below the water through hole 603 can effectively intercept impurities with density higher than that of water, such as sand, fiber, and the like in the sewage, thereby effectively preventing the impurities from entering the subsequent regulating tank 102, avoiding the problem of bottom plate 701 knot in the regulating tank 102, and meanwhile, the second partition plate 602 above the water through hole 603 can effectively intercept impurities floating on the surface of the sewage, such as oil stains, and the like, and achieving the purpose of effectively isolating light impurities, such as oil stains and the like.

When the sewage treatment device is specifically implemented, the shape of the water passing hole 603 can be determined according to actual requirements, for example, a round hole or a square hole can be adopted, in a preferred embodiment, the water passing hole 603 can preferentially adopt a rectangular hole, as shown in fig. 4, so that not only is slag blocking convenient, but also impurities floating on the surface of sewage, such as oil stains, can be intercepted conveniently.

Example 3

In order to solve the problem of intercepting large impurities in sewage during the sewage pretreatment process, the main difference between this embodiment 3 and the above embodiment 2 is that in the buried sewage pretreatment system provided in this embodiment, the buried sewage pretreatment system further includes a basket grid 900 device, correspondingly, the tank 101 is provided with a third manhole 211, the third manhole 211 is communicated with the slag blocking tank 601, as shown in fig. 5, the basket grid 900 device is disposed in the slag blocking tank 601 and corresponds to the third manhole 211, and the basket grid 900 device is communicated with the water inlet pipe 108 installed in the tank 101, as shown in fig. 5, so that sewage input into the tank 101 firstly enters the basket grid 900 device, so that the basket grid 900 device is used to intercept large impurities in sewage, sand, fiber and the like which are not intercepted and have a density greater than that of water enter the slag blocking tank 601 along with the sewage, and can be deposited in the slag blocking tank 601, thereby realizing better slag blocking effect.

In this embodiment, the structure of the third manhole 211 may be the same as that of the first manhole 201 or the second manhole 202, for example, as shown in fig. 5, the third manhole 211 comprises a cylinder 203 and a manhole cover 205 with a handle, the manhole cover 205 is connected to one end of the cylinder 203, the other end of the cylinder 203 is configured with a flange 204, the third manhole 211 may be directly connected to the tank 101 through the flange 204, or may be connected to a shaft 212 through the flange 204, the lower end of the shaft 212 is connected to the tank 101 through the flange 204, as shown in fig. 5, in this case, the third manhole 211 may be a standard component, and the height of the shaft 212 may be determined according to actual requirements, so as to leave the manhole cover 205 at a position at or above the ground; in a more sophisticated version, a fall arrest screen 206 is also installed in third manhole 211, as shown in figure 5.

The basket grid 900 device may adopt an existing basket grid 900 device, but in the existing basket grid 900 device, slag running is very easily caused at a mounting gap between the basket grid 900 and the water inlet pipe 108, and to solve the problem, the embodiment provides a novel basket grid 900 device, as shown in fig. 5-10, the basket grid 900 device includes a mounting seat 700 fixedly mounted on the tank body 101, a coupling seat 800, a guiding mechanism and a basket grid 900, wherein,

as shown in fig. 6, the mounting seat 700 is configured with a first coupling surface 703, a first water inlet 704 is configured in the first coupling surface 703, and the first water inlet 704 is communicated with the water inlet pipe 108 for water inlet;

as shown in fig. 7, the coupling seat 800 is configured with a second coupling surface 802 adapted to the first coupling surface 703, a second water inlet 803 is configured in the second coupling surface 802, and the basket grid 900 is connected to the coupling seat 800 and is communicated with the second water inlet 803 so as to introduce the sewage into the basket grid 900;

the guide mechanism comprises a guide part arranged along the vertical direction and an adapting part adapted to the guide part, the guide part is connected to the mounting seat 700, the adapting part is configured on the coupling seat 800, the adapting part is constrained to the guide part and forms a moving pair along the vertical direction with the guide part, so that the coupling seat 800 can strictly move along the vertical direction and can move between a first position and a second position, in the embodiment, the first position is positioned below the second position, as shown in fig. 6-10, and in the first position, the mounting seat 700 supports the coupling seat 800, the coupling seat 800 and the basket grid 900 are prevented from falling down, meanwhile, the second coupling surface 802 corresponds to the first coupling surface 703, and the second water inlet 803 is communicated with the first water inlet 704, as shown in fig. 5 and 9; in a preferred embodiment, in the first position, the second coupling surface 802 can be just attached to the first coupling surface 703, so that slag leakage can be effectively prevented, and accordingly, the second water inlet 803 can be directly opposite to the first water inlet 704, which is more convenient for water passing.

Specifically, in the present embodiment, by configuring the mounting seat 700 and the coupling seat 800 and connecting the basket grid 900 to the coupling seat 800, the coupling seat 800 is movably constrained to the mounting seat 700, so that the basket grid 900 can move between a first position and a second position under the action of external force, and the first position is located below the second position, so that the basket grid 900 can be raised/lowered under the action of external force, as shown in fig. 6-10, so as to clean the grid slag in the basket grid 900; by constructing the first coupling surface 703 on the mounting seat 700, constructing the second coupling surface 802 adapted to the first coupling surface 703 on the coupling seat 800, and constructing the first water inlet 704 and the second water inlet 803 in the first coupling surface 703 and the second coupling surface 802, respectively, when the coupling seat 800 is at an initial position, i.e., a first position, the second coupling surface 802 just corresponds to the first coupling surface 703, and the second water inlet 803 is communicated with the first water inlet 704, the coupling seat 800 and the mounting seat 700 are better fitted through the cooperation of the first coupling surface 703 and the second coupling surface 802, so that a gap between the coupling seat 800 and the mounting seat 700 can be effectively reduced or even eliminated, and the problem of slag leakage can be effectively avoided; and the second water inlet 803 is communicated with the first water inlet 704, so that the external sewage can enter the first water inlet 704 through the water inlet pipe 108, enter the second water inlet 803 through the first water inlet 704 and finally continuously enter the basket lifting grid 900 through the second water inlet 803, and the grid slag in the sewage can be intercepted by the basket lifting grid 900.

In a preferred embodiment, the first coupling surface 703 may be a vertical plane, as shown in fig. 6 to 10, and correspondingly, the second coupling surface 802 may also be a vertical plane, which is more favorable for eliminating a gap between the mounting seat 700 and the coupling seat 800 by the cooperation of the two vertical planes.

In the actual use process, when the grid slag intercepted in the basket grid 900 needs to be cleaned, only the basket grid 900 needs to be pulled upwards, so that the coupling seat 800 and the basket grid 900 move upwards together from the first position, in the process, the second coupling surface 802 moves upwards along with the first coupling surface 703 and gradually moves away from the first coupling surface 703, the second water inlet 803 gradually deviates from the first water inlet 704, even the second water inlet 803 is no longer communicated with the first water inlet 704, and when the coupling seat 800 and the basket grid 900 are pulled to the second position, as shown in fig. 10, the slag can be removed at the position; in this embodiment, the height difference between the first position and the second position may be determined according to actual requirements.

The guiding mechanism has various embodiments, for example, as shown in fig. 5-10, the guiding portion may be a guiding rod 707, and correspondingly, the adapting portion may be a guiding hole or guiding notch 805 adapted to the guiding rod 707; as another example, the guide portion may be a guide rail, and accordingly, the fitting portion may be a slider fitting the guide rail.

As shown in fig. 6 to 10, the mounting seat 700 is configured with a supporting portion for supporting the coupling seat 800, and in the first position, the supporting portion is located below the coupling seat 800 and contacts the coupling seat 800, as shown in fig. 9, not only to support and limit the coupling seat 800 in the first position, and prevent the coupling seat 800 from falling further, but also to allow the coupling seat 800 to move upward under the action of external force.

The basket grid 900 may be a cylindrical structure or a rectangular parallelepiped structure, and the bottom, side and/or top of the basket grid 900 is configured with a plurality of grid holes 901 for passing water; the side surface of the basket grid 900 is configured with an inlet 906, and the inlet 906 is communicated with the second water inlet 803, and the inlet 906 can be a round hole or a rectangular hole; the top of the basket grid 900 is further provided with a top plate 902, as shown in fig. 7 and 8, one end of the top plate 902 may be connected to the basket grid 900 through a hinge 903, and the other end may be connected to the basket grid 900 through a lock 904, so that the top plate 902 may be opened through the hinge 903 to remove slag from the top of the basket grid 900, and the lock 904 may be used to lock the top plate 902 to prevent the top plate 902 from opening by itself; to facilitate lifting the basket grid 900, the basket grid 900 is further configured with a hanging lug 905, as shown in fig. 7 and 8, so that the basket grid 900 is lifted by the hanging lug 905.

The structure of the mounting seat 700 may be determined according to actual requirements, for example, as shown in fig. 6-10, the mounting seat 700 includes a bottom plate 701, a first coupling plate 702 vertically disposed on the bottom plate 701, and a supporting plate 705 (i.e., the supporting portion) vertically disposed on the first coupling plate 702 and parallel to the bottom plate 701, the first coupling surface 703 is a side surface of the first coupling plate 702, and the first water inlet 704 is configured on the first coupling plate 702, as shown in fig. 6; the mounting base 700 is further configured with a mounting cylinder 706, and both ends of the mounting cylinder 706 can be connected to the first coupling plate 702 and the water inlet pipe 108, respectively;

correspondingly, the coupling seat 800 includes a second coupling plate 801 and a guide plate 804 vertically connected to the second coupling plate 801, the second coupling surface 802 is a side surface of the second coupling plate 801, and the second water inlet 803 is formed in the second coupling plate 801, as shown in fig. 7, the adapter is formed in the guide plate 804, and when the coupling seat 800 is in the first position, the first coupling surface 703 is attached to the second coupling surface 802, the first water inlet 704 is opposite to the second water inlet 803, and the guide plate 804 is just pressed against the support plate 705, as shown in fig. 8 and 9, the basket grid 900 may be connected to the second coupling plate 801 through a connecting cylinder 806.

In order to solve the problem that after the basket grid 900 is full of slag, the slag easily flows out of the inlet 906 of the basket grid 900 during the ascending slag discharge process of the basket grid 900, in a more complete scheme, a turning plate 907 for shielding the inlet 906 is arranged on one side of the inlet 906 away from the second water inlet 803, and the upper end of the turning plate 907 is rotatably connected to the basket grid 900, as shown in fig. 9 and 11, by arranging the turning plate 907, in the water inlet process, sewage can push the turning plate 907 away after passing through the second water inlet 803, so that the sewage can smoothly enter the basket grid 900; when the basket grid 900 rises, the turning plate 907 can automatically shield the inlet 906 under the action of gravity, and grid slag in the basket grid 900 can be effectively prevented from leaking through the inlet 906.

In particular implementations, the flap 907 may be connected to the basket grid 900 by hinges 903, as shown in fig. 11, such that the flap 907 has a degree of freedom to flip.

Example 4

The embodiment provides a buried sewage pretreatment system, which comprises the buried sewage pretreatment system described in embodiment 1, embodiment 2 or embodiment 3, and further comprises a biochemical treatment device 500 for performing biochemical treatment on sewage, wherein,

as shown in fig. 2, the adjusting tank 102 is communicated with the water inlet end of the biochemical treatment device 500 through a water outlet pipe 501, the water outlet pipe 501 is connected to the third joint 209, the lift pump 103 is disposed in the adjusting tank 102 and is communicated with the third joint 209 through a water outlet pipe 104 for sending the sewage to be treated into the biochemical treatment device 500 for biochemical treatment, the treated water is discharged through the water outlet of the biochemical treatment device 500, and the sludge output end of the biochemical treatment device 500 is communicated with the sludge tank 109 through a sludge discharge pipe 502 for sending the generated sludge into the sludge tank 109 for storage.

In a more sophisticated scheme, the system further comprises a gas booster 400, as shown in fig. 2, the gas booster 400 is used for providing power for the delivery of gas, the gas booster 400 may be respectively communicated with the oxygen supply pipe 106 and the stirring pipe 116 through a gas transmission pipeline 401, and the gas booster 400 may adopt a gas pump or a gas station.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.

Claims

1. A buried sewage pretreatment system is characterized by comprising a tank body, an oxygen supply module and a controller, wherein,

the controller is electrically connected with the first control valve and is used for controlling the first control valve to open/close so as to control the oxygen supply module to supply oxygen to the sludge tank intermittently.

2. The buried sewage pretreatment system of claim 1, further comprising a liquid level sensor for monitoring the liquid level in the sludge tank, wherein the liquid level sensor is electrically connected with the controller, the controller controls the first control valve to be closed when the liquid level collected by the liquid level sensor is higher than the lower edge of the backflow hole, and the controller controls the oxygen supply module to supply oxygen intermittently to the sludge tank when the liquid level collected by the liquid level sensor is equal to or lower than the lower edge of the backflow hole.

3. The buried sewage pretreatment system of claim 2, wherein the one-way control component comprises a movable cover plate, the upper end of the movable cover plate is movably connected to the first partition plate, the movable cover plate is arranged in the regulating tank, and the movable cover plate seals the backflow hole under the action of the self weight.

4. The buried sewage pretreatment system of claim 3, wherein the removable cover is connected to the first partition by a hinge; and/or a sealing ring is arranged between the movable cover plate and the first clapboard;

and/or the controller is a single chip microcomputer, a PC (personal computer) or a PLC (programmable logic controller).

5. The buried sewage pretreatment system of claim 1, wherein the tank body is further provided with a first manhole configured at a position corresponding to the sludge tank and communicating with the sludge tank;

and/or the tank body is also provided with a second manhole which is constructed at a position corresponding to the regulating tank and communicated with the regulating tank.

6. The buried sewage pretreatment system of claim 5, wherein a side wall of the first manhole is configured with a first joint for connecting a gas pipeline and a second joint for connecting a sludge discharge pipeline, the gas inlet pipe is communicated with the first joint, and the second joint is communicated with the sludge tank through a sludge inlet pipe;

and/or a third joint for connecting a water outlet pipeline is constructed on the side wall of the second manhole, a lifting pump is arranged in the adjusting tank, and the water outlet end of the lifting pump is communicated with the third joint through a water outlet pipe.

7. The buried sewage pretreatment system according to any one of claims 1 to 6, further comprising a stirring module, wherein the stirring module comprises a stirring pipe arranged in the regulating reservoir, a gas guide pipe communicated with the stirring pipe and a second controller valve, the gas guide pipe is used for being communicated with a gas booster, the stirring pipe is provided with a plurality of exhaust holes,

the controller is electrically connected with the second control valve and is used for controlling the opening/closing of the second control valve so as to control the gas to be delivered into/not to the regulating reservoir.

8. The buried sewage pretreatment system of any one of claims 1 to 6, wherein a slag blocking tank is further configured in the tank body, the slag blocking tank and the regulating tank are separated by a second partition plate and are communicated through a water passing hole configured in the second partition plate, the water passing hole has a set distance from the bottom of the slag blocking tank, the second partition plate below the water passing hole is used for blocking slag, and the second partition plate above the water passing hole is used for blocking oil stains.

9. The buried sewage pretreatment system of claim 8, further comprising a basket grid device, wherein the tank body is provided with a third manhole, the third manhole is communicated with the slag blocking tank,

the basket grid device is arranged in the slag blocking pool and corresponds to the third manhole, and the basket grid device is communicated with the water inlet pipe arranged in the tank body.

10. The buried sewage pretreatment system of claim 5, further comprising a biochemical treatment device for performing biochemical treatment on sewage and a gas booster, wherein,

the adjusting tank is communicated with the water inlet end of the biochemical treatment equipment through a water outlet pipeline and is used for sending sewage into the biochemical treatment equipment,

the sludge output end of the biochemical treatment equipment is communicated with the sludge tank through a sludge discharge pipeline and is used for conveying sludge into the sludge tank;

the gas booster is communicated with the oxygen supply pipe through a gas transmission pipeline, and the gas booster adopts a gas pump or a gas station.