CN203558919U - Device for treating mixed waste water by adopting high-concentration activated sludge process - Google Patents

Abstract

The utility model discloses a device for treating mixed wastewater by high-concentration activated sludge method, which comprises: an anaerobic zone, an aerobic zone and a sedimentation zone connected in sequence; an aeration system arranged at the front end of the aerobic zone; The sludge at the end of the zone is from the return plate; and the internal sludge return pump set in the aerobic zone is used to return the sludge collected from the return plate at the end of the aerobic zone to the aerobic zone front end. The utility model solves the problem that the sludge is easily lost when the mixed wastewater is treated by the high-concentration activated sludge method, and is especially suitable for the mixed wastewater of industrial wastewater and domestic sewage with complex components, high content of organic matter and difficult to degrade.

Description

A device for treating mixed wastewater with high-concentration activated sludge method

technical field

The utility model relates to the technical field of wastewater treatment by activated sludge method, in particular to a device for treating mixed wastewater by high-concentration activated sludge method.

Background technique

The mixed wastewater of industrial wastewater and domestic sewage has the characteristics of complex components, high content of organic matter, and refractory degradation. Biological treatment using ordinary aerobic activated sludge method requires complex pretreatment, which is costly and difficult to achieve ideal pollutant removal. Effect.

Compared with the ordinary aerobic activated sludge process, the AO process with the characteristics of high concentration activated sludge is more suitable for treating this kind of wastewater. The sludge concentration in the biochemical zone is twice that of the traditional aerobic process, and it still has many advantages: the biochemical zone with high sludge concentration occupies less land, and the project cost is low; the treatment efficiency is high, the system is stable, and the residual sludge The output is small; the front anaerobic zone can degrade most of the refractory organic matter, etc.

For example, the Chinese invention application with the publication number CN102874989A discloses a kind of anaerobic aerobic sewage treatment process and equipment for recycling high-concentration activated sludge, and uses activated sludge selective collectors to collect high-concentration activated sludge in the anaerobic reactor. , the high-concentration activated sludge is circulated internally through the circulating pump, fully in contact with the pollutants in the sewage, and the organic matter that is difficult to biodegrade and the non-dissolved organic matter are modified, and the modified sewage is subjected to a secondary aerobic reaction organ degradation. The anaerobic, facultative and aerobic activated sludge in the hydrolytic acidification reactor (anaerobic reactor) are mutually soluble in different sections, enabling microorganisms to domesticate in an anaerobic-facultative-aerobic alternating environment, promoting microbial diversity and food chain Extensibility, improve the effect of hydrolysis and acidification reaction in the anaerobic stage, shorten the reaction process, and reduce the amount of sludge generated.

However, when high-concentration activated sludge reacts, the sludge is easy to lose, thereby reducing the sludge concentration in the reaction zone. Therefore, how to stably maintain the high sludge concentration in the aerobic zone is the focus and difficulty of this process.

At present, the processes used around the world to control the concentration of activated sludge mainly include: control sludge discharge method, high concentration method of biological iron, gravity self-concentration multi-stage method, membrane bioreactor method and air flotation method. Among them, the controlled sludge discharge method is the easiest to operate and is also the most widely used process. However, this method is easy to cause sludge bulking, and requires regular chlorine addition to maintain a high sludge concentration. The reflux ratio is large and the energy consumption is high. Therefore, it needs to be improved.

Utility model content

The utility model provides a device for treating mixed wastewater with a high-concentration activated sludge method, which solves the problem that the sludge is easily lost when the high-concentration activated sludge method is used to treat mixed wastewater, and is especially suitable for complex components, high organic content, and difficult to degrade The mixed wastewater of industrial wastewater and domestic sewage.

A device for treating mixed wastewater with high-concentration activated sludge method, comprising:

Anaerobic zone, aerobic zone and sedimentation zone connected in sequence;

An aeration system set at the front end of the aerobic zone;

The sludge self-reflux plate set at the end of the aerobic zone;

And an internal sludge return pump arranged in the aerobic zone, the sludge return pump is used to return the sludge collected from the return plate from the end of the aerobic zone to the front end of the aerobic zone.

The front end of the aerobic zone and the tail end of the aerobic zone are determined according to the direction of water flow in the aerobic zone. nearby.

In order to extend the length in the aerobic zone, preferably, the water inlet and the water outlet of the aerobic zone are located on the same side wall of the aerobic zone, and the aerobic zone is provided with a the bezel. The baffle forms a baffle channel from the water inlet to the water outlet in the aerobic zone, and the baffle can also prevent the front-end aeration from affecting the tail-end sludge collection.

Preferably, the aerobic zone includes an aerobic zone in section A, an aerobic zone in section B and an aerobic zone in section C which are independent of each other and connected in sequence. The oxygen zone is equipped with an aeration system, an internal sludge return pump and a sludge self-return plate.

In the aerobic zone of each section, the aeration system is located at the front end, the internal sludge return pump is located in the middle, and the sludge return plate is located at the end.

As a preference, an online sludge concentration detection device for detecting the sludge concentration in the aerobic zone of section A, the aerobic zone of section B and the aerobic zone of section C is also provided. The sludge concentration on-line detection device can adopt a conventional detection device known in the art, and its probes are respectively inserted into the corresponding aerobic zone to monitor the sludge concentration in real time, and feed back to the switch of each return branch pipe, thereby regulating the size of the sludge return flow .

In the aerobic zone of Section A, the aerobic zone of Section B, and the front end of the aerobic zone of Section C, aeration heads are evenly distributed at the bottom of the zone, and sludge self-reflux plates are evenly distributed at the rear end of the reaction zone, and evenly distributed at the end of the reaction zone. There is an overflow weir.

In the utility model, the mixed wastewater of industrial wastewater and domestic sewage first enters the anaerobic zone to remove some pollutants in the mixed wastewater, so as to reduce the organic load in the aerobic zone, and the anaerobic wastewater enters the aerobic zone of section A in sequence , B segment aerobic zone, C segment aerobic zone. Aeration is performed at the front end of each aerobic zone to increase the dissolved oxygen in the wastewater and accelerate the removal rate of organic matter. The aeration rate at the rear end is gradually reduced, so that the wastewater can maintain a relatively stable flow state before reaching the sludge self-reflux plate. When the sludge flows from the return plate, it can effectively retain the sludge, so as to avoid excessive loss of sludge. Before the sludge flows from the return plate, the accumulated sludge flows back into the front end of each section of the reaction zone through the internal sludge return pump; Through the online sludge monitoring system and the sludge return pump in the sedimentation area, it can ensure that the sludge concentration in the aerobic area is stable and maintains a high concentration state.

The sludge concentration in zone A is 7-9g/L, the surface load is 0.3-0.5m ³ /m ^2. h, and the dissolved oxygen is controlled at 0.5-1.0mg/L; the sludge concentration in zone B is 5-7g/ L, surface load 0.5-0.7m ³ /m ^2. h, dissolved oxygen is controlled at 1.0-1.5mg/L; said C zone sludge concentration 3-5g/L, surface load 0.7-0.9m ³ /m ^{2 .h} , the dissolved oxygen is controlled at 1.5-2.0mg/L.

The volume of the aerobic zone in section A, the aerobic zone in section B, and the aerobic zone in section C are the same. The volume of the non-aeration zone at the back end of each aerobic zone is determined by the surface load, and the surface load of the non-aeration zone in the aerobic zone of section A is 0.3 -0.5m ³ /m ^2. h; the surface load of the non-aeration zone in the aerobic zone of section B is 0.5-0.7m ³ /m ^2.h ; the surface load of the non-aeration zone of the aerobic zone in section C is 0.7-0.9m ³ /m ^2. h. The remaining pool body is the aeration area.

Preferably, a digestate return device for returning the digestate in the aerobic zone of the C section to the anaerobic zone is also provided. The aerobic area in section C is connected to the sedimentation area and connected to the anaerobic area through the nitrification liquid return pump, and the pipeline connecting the anaerobic area is equipped with a switch to adjust the flow rate.

Preferably, there is also a sludge return device for returning the sludge in the sedimentation zone to the aerobic zone of section A, the aerobic zone of section B, the aerobic zone of section C and the sedimentation zone.

Part of the sludge in the sedimentation area flows back into the aerobic zone of section A, aerobic zone of section B, and aerobic zone of section C respectively through the sludge return pump. Control switches are respectively set on the branch pipes connecting each zone, and online monitoring of sludge concentration is set in each zone The system can adjust the switch of each branch pipe in real time according to the sludge concentration in the area, and change the flow rate of sludge return flow.

The aerobic zone of section A, the aerobic zone of section B, the online monitoring device of sludge concentration in the aerobic zone of section C, the internal sludge return pump in each aerobic section, and the digestive liquid connected to the anaerobic zone and the aerobic zone of section C The return pump and the sludge return device connecting the sedimentation area and each aerobic section constitute the control system.

After the waste water is reacted in the aerobic zone of section C, part of the mud-water mixture flows into the sedimentation zone, and after sedimentation and separation, the supernatant is drained away, and part of the sludge is refluxed; the other part of the mud-water mixture is returned to the anaerobic zone as a nitrification solution to further improve denitrification efficiency.

Preferably, the sludge self-reflux plate includes baffles and partitions arranged front and back, the baffles are located near the water outlet side of the corresponding aerobic zone, and the lower end of the baffle has a bending direction away from the corresponding aerobic area. The inclined plate deflector at the water outlet of the area. The front and rear mentioned here are determined according to the direction of water flow, and the front along the sewage flow direction is the front.

Further preferably, the upper end of the baffle has a sludge diversion buffer sloping plate whose bending direction is towards the front end of the corresponding aerobic zone, and the lower end has a deflector sloping plate whose bending direction is towards the rear end of the corresponding aerobic zone.

The sludge self-reflux plate can adopt the setting method and setting parameters of the baffle plate and the baffle plate disclosed by the applicant in the invention patent with the patent number ZL200710068352.0.

Beneficial effects of the utility model:

1) The utility model can handle the mixed wastewater of industrial wastewater and domestic sewage with complex components, high organic matter content, and difficult to degrade;

2) The utility model has simple operation, no energy consumption, reduces sludge loss, and avoids the disadvantage of insufficient dissolved oxygen;

3) Less residual sludge, high biological activity, good diversity, no need to add chlorine to control sludge bulking, saving energy;

4) The effluent has low turbidity, good water quality and high denitrification efficiency.

Description of drawings

Fig. 1 is a process flow chart of the present utility model.

Fig. 2 is a structural schematic diagram of the device of the present invention.

Fig. 3 is a cross-sectional structure diagram of the aerobic zone of section B of the utility model.

The reference signs shown in the figure are as follows:

Detailed ways

As shown in Figures 1 to 4, a device for treating mixed wastewater with high-concentration activated sludge method includes anaerobic zone, aerobic zone and sedimentation zone that are independent and connected in sequence.

The pool wall of the anaerobic zone 1 is provided with a water inlet, a sludge return port, a digestive liquid return port and a water outlet, and the water outlet is connected to the aerobic zone, and the aerobic zone includes the aerobic section A which is arranged in sequence, independent of each other and connected in sequence. The volume ratio of the reaction tanks in zone 2, aerobic zone 4 in section B and aerobic zone 6 in section C, aerobic zone 2 in section A, aerobic zone 4 in section B and aerobic zone 6 in section C is 1:1:1.

The aerobic zone 2 of section A is a rectangular pool, and the aeration system 3 is set at the bottom of the front end (the inlet end, near the water inlet) of the aerobic zone 2 of section A. A number of aeration heads on the top, and a sludge self-reflux plate 11 is set at the tail end (the outlet end, near the water outlet) of the aerobic zone 2 in section A.

In this embodiment, the structure of the sludge self-reflux plate 11 adopts the setting method and setting parameters of the baffles and baffles disclosed in the invention patent with the patent number ZL200710068352.0. The sludge self-reflux plate 11 includes baffles 11a and The baffle plate 11b, the baffle plate 11a is located near the water outlet of the corresponding aerobic zone, the baffle plate 11a is vertically arranged, and the lower end of the baffle plate has a slant deflector with a bending direction away from the water outlet of the corresponding aerobic zone, The baffle plate 11b is located behind the baffle plate 11a relative to the sewage flow direction, and the baffle plate 11b is arranged vertically. The upper end of the baffle plate 11b has a sludge deflection buffer swash plate with a bending direction facing the front end of the corresponding aerobic zone, and the lower end has a The bending direction is towards the deflector ramp corresponding to the end of the aerobic zone.

In order to extend the length of the aerobic zone and avoid the serious loss of sludge at the rear end due to the full mixing of mud and water due to front-end aeration, the water inlet and outlet of aerobic zone 2 in section A are located on the same side of the rectangular pool in aerobic zone 2 in section A. A baffle plate 13 is set between the water inlet and the water outlet of the aerobic zone 2 of section A, so that a baffle-type zone is formed from the water inlet to the water outlet in the aerobic zone 2 of section A. An internal sludge return pump 10 is set in the aerobic zone 2 of section A, and the internal sludge return pump returns the sludge collected from the return plate 11 at the tail end to the front aeration area.

An overflow weir 12 is set at the outlet of the aerobic zone 2 in the A section, and the wastewater treated in the aerobic zone in the A section overflows through the overflow weir 12 to the aerobic zone 4 in the B section. The structure of the aerobic zone 4 in the B section Same as the aerobic zone 2 of section A, the waste water treated by the aerobic zone 4 of section B overflows to the aerobic zone 6 of section C, and the structure of the aerobic zone 6 of section C is the same as that of the aerobic zone of section A.

There are sludge return outlets on the walls of the aerobic zone 2 of section A, the aerobic zone 4 of section B, and the aerobic zone 6 of section C. There is a sludge return device between the aerobic zone 4 of the section C and the aerobic zone 6 of the C section. The sludge return device includes a sludge return pump 8 and a sludge return pipe. The sludge return pipe includes a main pipe and a branch pipe, and the sludge return pump 8 is set on the main pipe, and each branch pipe is connected to the sludge return port of anaerobic zone 1, aerobic zone 2 of section A, aerobic zone 4 of section B and aerobic zone 6 of section C, and a control switch is set on each branch pipe.

An online sludge concentration monitoring device 9 is arranged above the reaction tank, and the probes of the online sludge concentration monitoring device 9 go deep into the aerobic zone of each section respectively.

Between the aerobic zone 6 and the anaerobic zone 1 of section C, a digestive juice return device is provided. The outlet of the anaerobic zone is connected to the return port of the digestive liquid in the anaerobic zone.

A water outlet is arranged on the sedimentation area 7, and the waste water after treatment is discharged from the water outlet.

After the reaction in the aerobic zone 6 of section C, part of the wastewater enters the sedimentation zone 10 for mud-water separation, and part of the sludge returns to the aerobic zone 4 of section A, the aerobic zone 4 of section B, and the aerobic zone 6 of section C. The specific sludge return flow depends on the activity Sludge online monitoring device 11 measures, and then feeds back to the branch switch of each sludge return pipe, so as to control the sludge concentration in aerobic zone 4 of section A to 7-9g/L, and the sludge concentration in aerobic zone 5 of section B to 5-7g /L, the sludge concentration in the aerobic zone 6 of section C is 3-5g/L; the other sludge will be treated by pressure filtration and landfill.

The above descriptions are only examples of the preferred implementation of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the present utility model. within the scope of the new protection.

Claims (6)

1. A device for treating mixed wastewater by high-concentration activated sludge method, characterized in that, comprising: Anaerobic zone, aerobic zone and sedimentation zone connected in sequence; An aeration system set at the front end of the aerobic zone; The sludge self-reflux plate set at the end of the aerobic zone; And an internal sludge return pump arranged in the aerobic zone, the sludge return pump is used to return the sludge collected from the return plate from the end of the aerobic zone to the front end of the aerobic zone. 2. The device for treating mixed wastewater by high-concentration activated sludge method according to claim 1, characterized in that, the aerobic zone comprises A section aerobic zone, B section aerobic zone and C section which are independent of each other and connected successively Aerobic zone, the aerobic zone of section A, the aerobic zone of section B and the aerobic zone of section C are respectively equipped with an aeration system, an internal sludge return pump and a sludge self-reflux plate. 3. according to the device of the described high-concentration activated sludge method of claim 2 processing mixed waste water, it is characterized in that, also be provided with and be used for detecting in described A section aerobic zone, B section aerobic zone and C section aerobic zone Sludge concentration online detection device for sludge concentration. 4. The device for treating mixed wastewater by high-concentration activated sludge method according to claim 3, characterized in that it is also provided with a digestive juice reflux device for returning the digestive juice in the aerobic zone of the C section to the anaerobic zone. 5. according to the device of the described high-concentration activated sludge method of claim 4 for processing mixed wastewater, it is characterized in that, the sludge in the settling area is also provided with returning respectively to the A section aerobic area, the B section aerobic area, the C section The sludge return device in the aerobic zone and the sedimentation zone. 6. The device for treating mixed wastewater according to the high-concentration activated sludge method according to any one of claims 2 to 5, wherein the sludge self-reflux plate includes baffles and partitions arranged before and after, and the The baffle is located near the water outlet side of the corresponding aerobic zone, and the lower end of the baffle has a slant deflector whose bending direction is away from the water outlet of the corresponding aerobic zone.

Images