CN201517061U - Sewage treatment system - Google Patents

Abstract

The utility model discloses a sewage treatment system, it is including a pretreatment systems, biochemical treatment system and a mud-water separation system all, the mud-water separation system is including an air supporting filter equipment, a sludge impoundment and clean water basin, air supporting filter equipment is including an air supporting device and a filtering ponds, the water inlet of air supporting device with biochemical treatment system's delivery port pipeline intercommunication, the delivery port through a water distribution tank and with the water inlet intercommunication of filtering ponds, mud discharging port through a mud pipe and with sludge impoundment pipeline intercommunication, the delivery port of filtering ponds pass through the outlet pipe and with the clean water basin pipeline intercommunication. The mud-water separation system of the sewage treatment system is constructed based on the air-flotation filtering device, the effluent treated by the biochemical treatment system can be further treated, the quality of the treated effluent can be greatly improved, the treated effluent can reach the quality standard of miscellaneous water and can be recycled, the recycling of the treated effluent is realized, and the waste of water resources is reduced.

Description

A sewage treatment system

technical field

The utility model belongs to the technical field of sewage treatment, in particular to a sewage treatment system.

Background technique

With the increase of urban population and the development of industrial and agricultural production, the amount of sewage generated in production and living processes is also increasing. In order to reduce the harm of sewage to water bodies and the environment, it needs to be purified before it is released into the environment. links. Most of the existing sewage treatment systems are composed of a pretreatment system, a biochemical treatment system and a mud-water separation system. The mud-water separation system is based on a secondary sedimentation tank. The effluent of the biochemical treatment system is directly discharged after sedimentation and separation in the secondary sedimentation tank. Although the water quality requirements of the discharged water can be met, with the improvement of environmental protection requirements, the existing sewage treatment system still needs to be improved to further enhance its sewage treatment effect and improve the standard of effluent water quality.

In addition, the same defect exists in the existing sewage treatment systems, that is, the various treatment pools used to form the sewage treatment system are scattered and distributed (the treatment pools are connected sequentially through pipelines), which makes the entire sewage treatment system occupy The large land area not only increases its construction cost, but also limits its scope of use. For example, in cities with relatively tight land use, the site selection of sewage treatment systems is greatly restricted.

Contents of the invention

The purpose of the utility model is to overcome the defects existing in the existing sewage treatment system and provide a sewage treatment system which can effectively improve the quality of the treated effluent.

In order to achieve the above object, the utility model adopts the following technical solutions: a sewage treatment system including a pretreatment system, a biochemical treatment system and a mud-water separation system, wherein the mud-water separation system includes an air flotation filter device, A sludge tank and a clean water tank, the air flotation filter device includes an air flotation device and a filter tank, the water inlet of the air flotation device is connected with the water outlet pipeline of the biochemical treatment system, and the water outlet It communicates with the water inlet of the filter tank through a water distribution tank, and the mud discharge port communicates with the pipeline of the sludge tank through a mud discharge pipe, and the water outlet of the filter tank communicates with the clean water through a water outlet pipe. pool plumbing.

In the above sewage treatment system, each treatment tank constituting the pretreatment system and the biochemical treatment system and the sludge tank and the clear water tank constituting the mud-water separation system are adjacent to and distributed in a ring shape, while the rest of the mud-water separation system Part of it is set at the center of the circular area to form a circular sewage treatment system.

In the above sewage treatment system, the biochemical treatment system includes an anaerobic tank, an anoxic tank and an aerobic tank connected in sequence, and the aerobic tank is provided with a ciliated biofilm filler.

In the above-mentioned sewage treatment system, the water inlet of the anaerobic tank is connected with the water outlet pipeline of the pretreatment system, wherein at least one submersible mixer is arranged, and the water inlet of the anoxic tank is connected with the anaerobic tank The outlet of the aerobic pool is connected to the outlet of the aerobic pool, and the aerobic pool is an oxidation ditch structure provided with an aeration device. A return device for returning sewage in the aerobic pool to the anoxic pool.

In the above sewage treatment system, the pretreatment system includes a regulating pond and a grid pond arranged at the water inlet of the regulating pond.

In the above sewage treatment system, an aerobic tank partition is arranged in the middle of the aerobic pool, and at least one third submerged push flow is provided on both sides of the aerobic tank partition in the same push flow direction. device.

In the above-mentioned sewage treatment system, the aeration device includes a main air duct for air distribution connected with a blower fan and a plurality of microporous aerators arranged at the lower part of the aerobic tank, and each microporous aerator passes through a The air distribution branch air duct communicates with the air distribution main air duct.

In the above sewage treatment system, the microporous aerator is a thin film tube microporous aerator, and is separately arranged on both sides of the partition plate of the aerobic tank.

In the above-mentioned sewage treatment system, an anoxic pool partition is provided in the middle of the anoxic pool, and at least one second submerged push flow is provided on both sides of the anoxic pool partition facing the same push flow direction. device.

In the above sewage treatment system, a regulating tank partition is provided in the middle of the regulating tank, and at least one first submerged flow pusher is respectively provided on both sides of the regulating tank partition facing the same flow direction.

The beneficial effect of the utility model is that the mud-water separation system is constructed based on the air flotation filter device, which can further treat the effluent treated by the biochemical treatment system, and can greatly improve the water quality of the treated effluent, making it reach the water quality of miscellaneous water Standards can be reused to realize the recycling of treated water and reduce the waste of water resources.

Description of drawings

Fig. 1 is a structural schematic diagram of the utility model sewage treatment system.

Fig. 2 is a schematic cross-sectional structure diagram of the sewage treatment system of the present invention.

Fig. 3 is a schematic diagram of the technological process of the sewage treatment system of the present invention.

Fig. 4 is a partial structural schematic diagram of the sewage treatment system of the present invention.

Fig. 5 is a structural schematic diagram of another embodiment of the sewage treatment system of the present invention.

Detailed ways

In order to make those skilled in the art more clearly understand the purpose, technical solutions and advantages of the utility model, the utility model will be further elaborated below in conjunction with the accompanying drawings and embodiments.

The sewage treatment system disclosed in the utility model is composed of a pretreatment system, a biochemical treatment system and a mud-water separation system. The domestic sewage or production sewage is removed from the suspended solids by the pretreatment system, and the water quantity and quality are adjusted before entering the biochemical treatment system. In this system, organic matter, phosphorus, nitrogen and other pollutants in the sewage are removed, and then the sludge-water separation system is used for further treatment.

Referring to Fig. 1 to Fig. 4, to illustrate the first embodiment of the present utility model.

The pretreatment system includes a regulating pond 100 and a grid pond 110 arranged at the water inlet of the regulating pond 100 .

The production sewage or domestic sewage is introduced into the grid pool 110, and the suspended impurities in the sewage are removed by the grid machine 111 installed in the grid pool 110, so as to prevent the suspended impurities from entering the treatment tank of the next stage and affecting the damage to the device. The grid machine 111 can be selected from one or more of the rotary mechanical grid machine, reverse-cut rotary grid machine, net-type rotary chain grid machine, and fixed grid machine. For water requirements, the grid machine 111 is preferably a fine grid machine with a grid gap of 1-5 mm.

The sewage treated by the grid tank 110 flows into the regulating tank 100 to adjust the water quantity and quality of the sewage, so that the sewage can evenly enter the biochemical treatment system in the subsequent stage. The regulating tank 100 is designed as a fan-ring structure with arc-shaped ends, and a regulating tank partition 101 is arranged in the middle to form a treatment tank for the circulating flow of sewage. Each side is provided with a first submersible pusher 102 facing the same flow direction. After the sewage enters the regulating pond 100 from the grille pond 110, the first submersible pusher 102 is opened to push the sewage to circulate in the regulating pond 100, which can play a role in uniforming the water quality and quantity of the sewage, and can also prevent the waste water from Contains suspended matter that precipitates. Admittedly, more or fewer first submerged flowmakers 102 can be set in the regulating tank 100, but, in the case of having two or more first submerged flowmakers 102, all must move towards the same direction. set for flow direction.

The biochemical treatment system is constructed based on the A/A/O biochemical treatment process, which includes an anaerobic pool 200 , an anoxic pool 210 and an aerobic pool 220 connected in sequence.

The water inlet of the anaerobic tank 200 is connected with the outlet pipeline of the regulating tank 100 of the pretreatment system, and the sewage after water quality and water adjustment is introduced into the anaerobic tank 200, and is returned to the anaerobic tank 200 from the mud-water separation system sludge mixing. In the anaerobic tank 200, the phosphorus contained in the return sludge is released, the dissolved organic matter in the sewage is absorbed by microorganisms to reduce the BOD concentration of the sewage, and at the same time, the NH ₃ -N in the sewage is partially removed due to the synthesis of cells , thereby reducing the concentration of NH ₃ -N in sewage. At least one submersible agitator 201 is arranged in the anaerobic tank 200, and the stirring action of the submersible agitator 201 ensures uniform mixing of sewage and return sludge and prevents sludge from settling.

The water inlet of the anoxic pool 210 communicates with the water outlet of the anoxic pool 200, and an anoxic pool partition 211 is arranged in the middle to form a treatment pool for sewage circulation, and is located in the anoxic pool partition in the pool. The two sides of the plate 211 are respectively provided with a second submersible flow pusher 212 facing the same flow direction. With the function of the second submerged flowmaker 212, the sewage from the anaerobic pool 200 and the backflow sewage from the aerobic pool 220 are mixed in the anoxic pool 210, and the denitrification occurs because the mixed solution is in an anoxic state. The reaction takes place here, thereby removing most of the nitrogen in the sewage. In this embodiment, the anaerobic pool 200 and the anoxic pool 210 are closely distributed, and a through hole 202 is formed at the junction of the two, which is flat on the bottom of the anaerobic pool 200, through which the anaerobic pool 202 is realized. The connection between the oxygen pool 200 and the anoxic pool 210 allows the effluent from the anaerobic pool 200 to flow into the anoxic pool 210 through the water hole 202 .

The aerobic pool 220 is designed as an oxidation ditch structure, and its water inlet communicates with the water outlet of the anoxic pool 210, and at least one backflow device 221 is set between the aerobic pool 220 and the anoxic pool 210, for turning the aerobic pool 220 The sewage in the backflow is imported in the anoxic tank 210. An aerobic tank partition 222 is arranged in the middle of the aerobic pool 220, and a third submerged flow pusher 223 is respectively provided at the both sides of the aerobic tank partition 222 toward the same pushing flow direction, and a submersible flow pusher is adopted. The push flow of the oxidation ditch is realized, so that the water flow is transferred from the lower layer to the upper layer. Compared with the surface aeration, which uses a rotating brush or an inverted umbrella type aerator to transfer the water flow from the upper layer to the lower layer, energy consumption can be reduced.

The aeration device adopted in the aerobic tank 220 includes a gas distribution main air duct 224 connected with a blower fan and a plurality of microporous aerators 225 arranged at the bottom of the aerobic tank 220, and each microporous aerator 225 passes through An air distribution branch air duct 226 communicates with the air distribution main air duct 224 . The aeration device adopts the method of deep water microporous aeration, combined with the underwater pushing flow realized by the third submersible pusher 223, which can increase the total oxygen transfer amount, effectively improve the oxygen utilization rate and reduce the aeration rate. At the same time, it can fully stir and mix the sludge and raw water to prevent the sludge from settling, so that the nitrification reaction can be carried out thoroughly. Preferably, the microporous aerator 225 is a thin film tube microporous aerator, and a plurality of microporous aerators are arranged on both sides of the aerobic tank partition 222 .

The aerobic tank 220 is also provided with a ciliated biofilm filler 227, so that the nitrifying bacteria in the aerobic tank 220 can inhabit the surface of the ciliated biofilm filler 227 without participating in the sludge return, thereby reducing the negative impact caused by the removal of excess sludge. The impact on the number of nitrifying bacteria is minimized. Through the setting of the ciliated biofilm filler 227, to increase the concentration of attached microorganisms in the aerobic tank 220, the stationary phase microorganisms attached to the ciliated biofilm filler 227 and the floating mobile phase microorganisms in the sewage cooperate to complete the removal of pollutants It can remove pollutants such as organic matter, nitrogen and phosphorus contained in sewage in a short residence time, and improve the effect of biochemical treatment.

The mud-water separation system includes an air flotation filter device 300, a sludge tank 310, and a clean water tank 320, wherein the air flotation filter device 300 includes an air flotation device 301 and a filter tank 302, which are integrated. The water inlet of the air flotation device 301 is communicated with the water outlet pipeline of the aerobic tank 220, and its water outlet is communicated with the water inlet of the filter tank 302 through a water distribution tank, and the mud discharge port is connected with the sludge discharge port through a mud discharge pipe 303. Mud pool 310 pipelines are communicated; The water outlet of filter tank 302 is communicated with clear water pool 320 pipelines by outlet pipe 304. The effluent from the aerobic tank 220 enters the air flotation device 301 for mud-water separation treatment, the treated sewage enters the filter tank 302 through the water distribution tank for filtration treatment, and the sludge is discharged into the sludge tank 310 through the sludge discharge pipe 303 . The filter tank 302 filters the sewage from the air flotation device 301 , and then flows into the clean water tank 320 through the outlet pipe 304 .

A sludge return device 311 is provided in the sludge tank 310 for returning the sludge to the anaerobic tank 200 . Generally, the sludge return device 311 includes a submersible sewage pump 312 and a sludge return pipe 313 connected to the submersible sewage pump 312 and connected to the anaerobic tank 200 .

The air flotation filter device further treats the effluent treated by the biochemical treatment system, which can greatly improve the water quality of the treated effluent, make it reach the water quality standard of miscellaneous water and can be reused, realize the recycling of the treated effluent, reduce Waste of water resources.

When constructing the sewage treatment system, the grid tank 110 and the regulating tank 100 of the pretreatment system, the anaerobic tank 200, the anoxic tank 210 and the aerobic tank 220 of the biochemical treatment system, and the sludge tank 230 and the clean water tank of the mud-water separation system 240 and other treatment pools are adjacent to and distributed in a ring shape, and the air flotation filter device 300 of the mud-water separation system is placed in the central area of the ring-shaped area, thereby forming a sewage treatment system with a circular structure. Such a distribution method can be compact Combining individual treatment tanks reduces the footprint of the sewage treatment system.

Referring to Fig. 5, another embodiment of the present utility model is described. In this embodiment, the mud-water separation system includes a secondary settling tank 400, a sludge tank 410 and a clean water tank 420, wherein the sludge tank 410 and the clean water tank 420 are connected with each treatment tank of the pretreatment system and the biochemical treatment system It is adjacent to and distributed in a circular shape, and the secondary settling tank 400 is arranged at the center of the circular area, thereby forming a circular sewage treatment system. After the effluent of the biochemical treatment system flows into the secondary settling tank 400 for mud-water separation, the supernatant is led to the clear water tank 420 , and the sludge produced by precipitation is discharged into the sludge tank 410 . The difference between this embodiment and the previous embodiment is that a secondary settling tank is used instead of an air flotation filter to form a mud-water separation system of a sewage treatment system.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model in any form. Those skilled in the art can make various equivalent changes and improvements on the basis of the above-mentioned embodiments, and all equivalent changes or modifications made within the scope of the claims shall fall within the protection scope of the present utility model.

Claims (10)

1. Sewage treatment systems, include a pretreatment system, an one biochemical treatment system and a sludge-water separating system, it is characterized in that: described sludge-water separating system includes an air-float filtration device, one sludge sump and clean water basin, wherein, described air-float filtration device includes an air-floating apparatus and filtering basin, the water-in of described air-floating apparatus is communicated with the water outlet pipeline of described biochemical treatment system, and its water outlet is communicated with the water-in of described filtering basin by a distributing trough, and mud discharging mouth by a shore pipe and with described sludge sump pipeline connection, the water outlet of described filtering basin by rising pipe and with described clean water basin pipeline connection.

2. Sewage treatment systems as claimed in claim 1, it is characterized in that: constitute each treating pond of described pretreatment system and biochemical treatment system and constitute the sludge sump of described sludge-water separating system and clean water basin next-door neighbour and be circular distribution, the rest part of described sludge-water separating system then is arranged at the center in circular zone, thereby forms the Sewage treatment systems of circular configuration.

3. Sewage treatment systems as claimed in claim 1 is characterized in that: described biochemical treatment system includes an anaerobic pond, an anoxic pond and an Aerobic Pond that is communicated with in turn, is provided with the cilia-like biofilm filler in the described Aerobic Pond.

4. Sewage treatment systems as claimed in claim 3, it is characterized in that: the water-in of described anaerobic pond is communicated with the water outlet pipeline of described pretreatment system, wherein be provided with at least one submersible agitator, the water-in of described anoxic pond is communicated with the water outlet of described anaerobic pond, described Aerobic Pond is the oxidation ditch structure that is provided with aerating apparatus, its water-in is communicated with the water outlet of described anoxic pond, and at least one being used for the sewage backflow of the described Aerobic Pond reflux to the described anoxic pond is set between described Aerobic Pond and anoxic pond.

5. Sewage treatment systems as claimed in claim 4 is characterized in that: described pretreatment system includes the grating tank that an equalizing tank and is arranged at described equalizing tank water inlet.

6. Sewage treatment systems as claimed in claim 4 is characterized in that: the place is provided with an Aerobic Pond dividing plate in the middle of the described Aerobic Pond, and the place, both sides that is positioned at described Aerobic Pond dividing plate respectively is provided with at least one the 3rd diving impeller towards same plug-flow direction.

7. Sewage treatment systems as claimed in claim 4, it is characterized in that: described aerating apparatus includes a gas distribution air main that is connected with blower fan and a plurality of micro-hole aerator that is arranged at described Aerobic Pond bottom, and each micro-hole aerator is communicated with described gas distribution air main by a gas distribution branch wind pipe separately.

8. Sewage treatment systems as claimed in claim 7 is characterized in that: described micro-hole aerator is a film tube-type micropore aerator, and is divided into the place, both sides of described Aerobic Pond dividing plate.

9. Sewage treatment systems as claimed in claim 4 is characterized in that: the place is provided with an anoxic pond dividing plate in the middle of the described anoxic pond, and the place, both sides that is positioned at described anoxic pond dividing plate respectively is provided with at least one second diving impeller towards same plug-flow direction.

10. Sewage treatment systems as claimed in claim 5 is characterized in that: the place is provided with an equalizing tank dividing plate in the middle of the described equalizing tank, and the place, both sides that is positioned at described equalizing tank dividing plate respectively is provided with at least one first diving impeller towards same plug-flow direction.

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