CN216687812U

CN216687812U - Combined vertical AAO sewage treatment device

Info

Publication number: CN216687812U
Application number: CN202121451772.9U
Authority: CN
Inventors: 左小龙; 贺开明
Original assignee: Chengdu Dingyang Environmental Protection Technology Co ltd
Current assignee: Chengdu Dingyang Environmental Protection Technology Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2022-06-07
Anticipated expiration: 2031-06-17

Abstract

The combined vertical AAO sewage treatment device comprises an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, a disinfection clean water tank, an equipment room, a dosing room and the like; the structure is divided into an upper layer and a lower layer, wherein the lower layer is an anaerobic tank, an anoxic tank, an equipment room and a dosing room; the upper layer is composed of a contact aerobic tank, a secondary sedimentation tank and a disinfection clean water tank which are connected with each other through a communicating pipe or a hole. The device has expandability, the number of complete devices is increased, and the treatment capacity of domestic sewage can be increased, so that the design and construction difficulty of engineering is simplified; the construction cost of civil engineering is obviously reduced, and the construction land is saved; the device has the advantages of strong capability of adapting to the change of the sewage quality, high sludge load, convenient operation and adjustment, good water quality treatment effect, unmanned automatic control, simple and convenient production operation management, reduction of the operation, maintenance and production management costs of sewage treatment plants and the like.

Description

Combined vertical AAO sewage treatment device

Technical Field

The device is suitable for the field of sewage treatment such as domestic sewage, medical sewage and the like.

Background

Domestic sewage is wastewater discharged in daily life of residents and mainly comes from residential buildings and public buildings, such as houses, institutions, schools, hospitals, shops, public places, toilets, kitchen sewage and the like. The pollutants contained in the domestic sewage are mainly organic matters (such as protein, carbohydrate, fat, urea, ammonia nitrogen and the like) and a large amount of pathogenic microorganisms (such as parasitic ova, enteroinfectious viruses and the like). Organic matters existing in domestic sewage are extremely unstable, are easy to decay to generate stink, deteriorate the quality of surface water and underground water, have high ammonia nitrogen concentration, and can cause harm to human bodies and the environment if directly discharged without being treated. Bacteria and pathogens propagate in large quantities by taking organic matters in domestic sewage as nutrients, so that infectious diseases can spread. Therefore, domestic sewage must be treated before being discharged.

The urban domestic sewage is characterized in that:

firstly, sewage contains a large amount of grease, food residues and the like, and has high suspended matters and high chromaticity.

② the sewage contains a large amount of residual food and the like, which causes the waste water to have larger taste and be easy to smell.

And thirdly, the fluctuation of the water quality and the water quantity of the sewage is large, and the sewage has time periodicity.

Fourthly, the sewage has higher concentration of organic matters, higher nitrogen source and phosphorus source, and direct discharge is easy to cause eutrophication of surface water body, algae breeding, blackening and smelliness.

The sewage sources mainly comprise: the sewage of the toilet and the toilet belongs to the fecal sewage, the concentration of pollutants is highest, and the pollutants have stink and mainly comprise COD, BOD and NH4-N, TN; the kitchen sewage and the laundry wastewater at the first time have high pollutant concentration, mainly including COD (chemical oxygen demand), BOD (biochemical oxygen demand), TP (total phosphorus) and the like, wherein the COD is as high as 10000 mg/l; TP caused by kitchen rice washing water and phosphorus-containing laundry detergent is high; the concentration of the pollutants in the bath wastewater is relatively low.

Sixthly, the quality of the domestic sewage is regionally characterized, the concentration of the developed urban domestic sewage pollutants is high, the concentration of the urban domestic sewage pollutants is medium, and the concentration of the rural domestic sewage pollutants is low. The rural domestic sewage quality is greatly different due to different drainage types, the rural domestic sewage rarely contains heavy metals and toxic and harmful substances, and the content of organic matters, nitrogen and phosphorus is high, and the biodegradability is good.

High-order pollutant in domestic sewage: chemical Oxygen Demand (COD)_cr) At 800-1000mg/l, five days Biochemical Oxygen Demand (BOD)₅) 500mg/l at 400-400mg/l, Total Nitrogen (TN) of 80-100mg/l, Total Phosphorus (TP) of 20-30mg/l, total organic carbon (TDC) of 280-320mg/l and grease of 140-160 mg/l.

Median of pollutants in domestic sewage: chemical Oxygen Demand (COD)_cr) At 400-₅) At 240mg/l in 200-l, 220mg/l in suspended matter (SS), 40-50mg/l in Total Nitrogen (TN), 10-15mg/l in Total Phosphorus (TP), 160mg/l in total organic carbon (TDC) 140-l and about 80-120mg/l in oil.

Low-order pollutant in domestic sewage: chemical Oxygen Demand (COD)_cr) At 200-₅) At 100-120mg/l, suspended matter (SS) at 80-120mg/l, Total Nitrogen (TN) at 20-25mg/l, Total Phosphorus (TP) at 4-6mg/l, total organic carbon (TDC) at 60-80mg/l, and grease at 40-60 mg/l.

Aiming at domestic sewage, the main part is A²O and improved A²The technology of/O, SBR and improved technology CASS method, oxidation ditch method, Membrane Bioreactor (MBR), physical and chemical treatment method, natural treatment method and the like exist in different degrees in practical application for treating COD of effluent_cr、BOD₅The ammonia nitrogen index exceeds the standard, and the problems of large occupied area of engineering facilities, high construction cost, large civil engineering construction difficulty and the like are solved.

SUMMERY OF THE UTILITY MODEL

Aims to solve the problem of effluent COD existing in the domestic sewage treatment process_cr、BOD₅The utility model provides a combined vertical AAO sewage treatment device, which solves the problems of excessive ammonia nitrogen indexes, large occupied area of engineering facilities, high construction cost, high civil engineering construction difficulty and the like.

The combined vertical AAO sewage treatment device mainly comprises an upflow anaerobic tank, an upflow anoxic tank, a contact aerobic tank, a secondary sedimentation tank and a disinfection clean water tank.

One of the innovation points of the utility model is that the lower part of the anaerobic tank is composed of an anaerobic tank and an anoxic tank which are connected through a communicating pipe, water flow of the anaerobic tank enters from the bottom, anaerobic sludge is in a lower part suspension state, the anaerobic sludge has higher sludge load, and the sludge load can reach 30-40 g/l. The water flow of the anoxic tank enters from the bottom, anoxic sludge is in a lower suspension state, and the anoxic sludge has higher sludge load which can reach 30-40 g/l.

The second innovation point of the utility model is that the upper part of the device consists of a contact aerobic tank, a secondary sedimentation tank and a disinfection clean water tank which are connected in sequence through a communicating pipe or a hole, and the water discharged from the anoxic tank enters the contact aerobic tank through the hole at the top of the tank.

The utility model has the third innovation point that the mixed liquid in the anoxic tank partially flows back to the anaerobic tank through the internal circulation pump 1 to form mixed liquid internal circulation r1, wherein the reflux ratio is 50-100%; the mixed liquor at the tail end of the upper aerobic tank returns to the anoxic tank through the internal circulation pump 2 and the communication hole to form mixed liquor internal circulation r2, wherein the reflux ratio is 50-100%. And returning a part of sludge in the secondary sedimentation tank to the anaerobic tank through a sludge pump to form sludge reflux R, wherein the reflux ratio is 50-100%, returning a part of sludge to the sewage adjusting tank to form sludge reflux R', the reflux ratio is 10-50%, and the reflux ratio is adjusted through a flowmeter and a control valve.

The utility model is characterized in that the lower part of the secondary sedimentation tank is provided with an equipment room, which is mainly used for placing a blower and an electric control cabinet, and the lower part of the disinfection clean water tank is provided with a dosing room, which is mainly used for placing a disinfectant metering device and disinfectant.

The device of the utility model combines the anaerobic tank, the anoxic tank, the contact aerobic tank, the secondary sedimentation tank, the disinfection clean water tank, the blower equipment room and the dosing room into a whole with an upper layer structure and a lower layer structure, and the two layers of structures are connected with each other through the communicating pipe and the holes, so that the engineering cost is reduced integrally, the occupied area is saved, and the integration and the unmanned management of the equipment are realized through the electric automatic control system.

Because the device of the utility model is provided with the independent processing unit, the pre-assembly and the combination expandability can be realized, the sewage treatment modularization and the intellectualization can be realized, and the domestic sewage treatment projects with different treatment scales can be satisfied.

Drawings

FIG. 1 is a block diagram of the present invention.

FIG. 2 is a process flow diagram of the present invention.

Fig. 3 is a plan view of an embodiment of the apparatus of the present invention.

Fig. 4 is a view of the structure of the vertical face of the embodiment of the apparatus of the present invention.

Fig. 5 is a front elevational view of an embodiment of the apparatus of the present invention.

Fig. 6 is a rear elevational view of an embodiment of the apparatus of the present invention.

FIG. 7 is a sectional view taken along line I-I of an embodiment of the apparatus of the present invention.

FIG. 8 is a sectional view of the apparatus according to the embodiment of the present invention taken along line II-II.

Fig. 9 is a system diagram of the architecture of an embodiment of the present invention.

In fig. 9, 1 is a grid well, 2 is a grid, 3 is an oil separation grit chamber, 4 is a sewage adjusting tank, 5 is a sewage lifting pump, 6 is an anaerobic tank, 7 is an anoxic tank, 8 is an aerobic tank, 9 is a secondary grit tank, 10 is a disinfection clean water tank, 11 is a disinfection liquid feeding device, 12 is an air blower, 13 is a sludge tank, 14 is a sludge pump, 15 is a filter press, 16 is a mixed liquid reflux pump, 17 is a grit chamber sludge discharge pump, 18 is a microporous aeration disc, 19 is an elastic filler, 20 is a manhole, 21 is a vent pipe, 22 is a honeycomb inclined pipe, 23 is a communicating pipe, 24 is an equipment room, and 25 is a dosing room.

Detailed Description

The combined vertical AAO sewage treatment device comprises an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, a disinfection clean water tank, a blower equipment room, a disinfection metering room and the like. The structure is divided into an upper layer and a lower layer, wherein the lower layer is an anaerobic tank, an anoxic tank, a blower equipment room and a disinfection metering room; the upper layer is composed of a contact aerobic tank, a secondary sedimentation tank and a disinfection clean water tank which are connected with each other through a communicating pipe and a hole.

The tank body of the combined vertical AAO sewage treatment device can be formed by welding carbon steel materials, performing anticorrosion treatment on the inner wall and the outer wall, and can also be formed by welding 304 stainless steel argon arc; the submersible sewage pump, the mixed liquid reflux pump, the sludge pump, the control valve, the gauge table, the filler and the like can be purchased in the electromechanical market; the electric control system sets a control programmer or a PLC controller according to the process requirements, and the whole set of device realizes automatic and unmanned management.

The combined vertical AAO sewage treatment device can be arranged on the ground, and can also be arranged semi-underground or buried. Such as a semi-underground or buried arrangement, the equipment room and the sterilization and drug-adding room are separated from the device and separately arranged on the ground.

The application range is as follows: the device is suitable for treating domestic sewage of towns, villages and enterprises and domestic sewage of medical institutions, and is also suitable for treating high-concentration organic wastewater.

The device has expandability, the number of complete devices is increased, and the treatment capacity of domestic sewage can be increased, so that the design and construction difficulty of engineering is simplified; the construction cost of large-scale civil engineering is obviously reduced, and the land is saved; the complete device is automatically controlled and unmanned, the production operation management is simple and convenient, and the operation, maintenance and production management costs of a sewage treatment plant are reduced; the complete set is an independent processing unit, and has the advantages of effectively avoiding the integral deterioration and standard exceeding discharge of the water quality of the traditional sewage treatment plant and the like.

The device of the utility model can reduce or enlarge a certain structural size in proportion and is suitable for sewage quantity of 1m³/h～10m³The sewage treatment capacity is per hour, and when the sewage amount exceeds 10m³The processing capacity of the device is/h, the manufacturing size is determined according to the comparison of structure checking calculation and economic calculation, and the number of the complete devices can be increased for matching.

Figure 2 shows a process flow diagram of the apparatus of the utility model.

FIGS. 3 to 8 are views showing the processing and manufacturing structure of the plane, the elevation, the side elevation and the section of the device of the present invention, wherein the sewage treatment capacity is 4.0m³H (about 100 m)³/d)。

FIG. 9 shows a structural system diagram of an embodiment of the device of the present invention, domestic wastewater automatically flows to a grid well 1 through a blow-off pipe, hair, waste paper and the like are removed through a grid 2, the domestic wastewater enters an oil separation grit chamber 3, grease with light density floats upwards and gathers under the action of gravity after the flow rate is reduced, silt with large specific gravity is precipitated, the precipitated silt is periodically discharged to a silt concentration tank 13 through a dredge pump 17, the wastewater enters an adjusting tank 4 for water quantity adjustment and water quality equalization, the precipitated silt is mixed with returned residual sludge and sludge in an anoxic tank, then the mixture is conveyed to an anaerobic tank 6 through a wastewater lifting pump 5 and is hydrolyzed and acidified through anaerobic bacteria, high molecular organic substances are broken into low molecular substances and organic acid, effluent enters an anoxic tank 7 for denitrification reaction under an anoxic state, nitrate is converted into nitrogen to be discharged into a liquid phase, the effluent enters an aerobic tank 8, and is intermittently fed to the aerobic tank 8 through a Roots aeration blower 12, the gas-water ratio is maintained at 6-8: 1, sufficient dissolved oxygen DO is provided for aerobic bacteria, microorganisms and lower organisms, digesting and absorbing organic matters in the wastewater under the action of aerobic bacteria and lower organisms, leading the effluent to enter a secondary sedimentation tank 9 for mud-water separation, discharging the effluent into a disinfection tank 10, adding a disinfectant through a disinfectant adding device 11 for disinfection, discharging the effluent after reaching the standard, returning the sludge in the secondary sedimentation tank to the inlet section of an anaerobic tank through a sludge return pipe, wherein the reflux ratio is about 50-150%, returning a part of the sludge to a sewage regulating tank, the reflux ratio is 10-50%, through control valve regulation, surplus sludge is discharged to a sludge concentration tank 13, is pressurized by a slurry pump 14 and is sent to a chamber filter press 15, the dewatered sludge is transported outwards at regular intervals, the filtered water returns to a sewage regulation tank for retreatment, the tail section of an aerobic tank 8 returns to the front section of an anoxic tank 7 through a mixed liquid reflux pump 16, and the tail section of the anoxic tank 7 returns to the water inlet section of an anaerobic tank 6 through the mixed liquid reflux pump 16.

Claims

1. A combined vertical AAO sewage treatment device is composed of an anaerobic tank, an anoxic tank, a contact aerobic tank, a secondary sedimentation tank, a disinfection clean water tank, an equipment room and a disinfection dosing room.

2. The combined vertical AAO sewage treatment plant according to claim 1, wherein the anaerobic tank, the anoxic tank, the equipment room and the disinfection and chemical-feeding room are arranged on a first lower layer, and the contact aerobic tank, the secondary sedimentation tank and the disinfection clean water tank are arranged on a second upper layer; the blower and the electrical control system are arranged in the equipment room, and the disinfectant dosing device is arranged in the dosing room.

3. The combined vertical AAO sewage treatment plant as claimed in claim 1 and claim 2 wherein the mixed liquor at the end of the anoxic tank is returned to the anaerobic tank through the internal circulation pump and the pipeline to form a mixed liquor internal circulation r 1; the mixed liquor at the end of the aerobic tank flows back to the anoxic tank through the internal circulation pump, the communication hole and the pipeline to form an internal circulation r 2; and the sludge in the secondary sedimentation tank flows back to the anaerobic tank and the water inlet section of the anoxic tank to form sludge backflow external circulation R, a backflow sludge flange interface to the regulating tank is reserved, and the sludge backflow proportion is regulated by a control valve.