Sequencing batch type rural domestic sewage treatment device

Abstract

The utility model provides a sequencing batch rural domestic sewage treatment device which comprises a tank body provided with a pre-reaction area and a main reaction area, a water inlet pipe is arranged at the upper part of the pre-reaction area, biological stuffing is arranged in the middle of the pre-reaction area, and the bottom of the pre-reaction area is communicated with the main reaction area through a water passing hole; a biological filler is arranged in the middle of the main reaction zone, an aeration device is arranged at the bottom, and sludge in the main reaction zone flows back to the pre-reaction zone through a sludge return pipe and gas stripping of the autonomous reaction zone; the main reaction zone is provided with a drain pipe for gas stripping drainage; the rural domestic sewage treatment device is simple in treatment process flow and small in occupied area and volume, the problem of intermittent discharge of rural domestic sewage can be well solved through sequencing batch reaction, and the rural domestic sewage can be efficiently and stably treated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a sequencing batch rural domestic sewage treatment device. BACKGROUND

[0002] With the increase of rural residents' domestic water consumption, the discharge of domestic sewage is also greatly increased. The rural domestic sewage is discharged without treatment, which exceeds the regional environmental capacity and easily forms black and odorous water body, seriously affecting the living environment of rural residents.

[0003] At present, the rural domestic sewage treatment work has been carried out in all regions of China, but in most regions, the treatment process selected does not fully consider the characteristics of sewage discharge in rural areas, and the optimal treatment effect has not been achieved. The main performance is that the discharge of rural domestic sewage is mainly intermittent, and the discharge volume fluctuates greatly at different time periods every day, while most of the treatment processes adopt continuous flow sewage treatment process, which is contrary to the objective conditions of small water quantity and intermittent discharge in rural areas, and easily causes excessive reaction of biochemical reaction system, large consumption and loss of biological membrane and activated sludge, and affects the treatment effect of biochemical reaction.

[0004] Therefore, according to the characteristics of rural domestic sewage discharge, it is very urgent to develop a sewage treatment equipment suitable for the intermittent discharge characteristics of rural areas to improve the treatment effect of rural domestic sewage. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a sequencing batch rural domestic sewage treatment device which can adapt to the intermittent discharge characteristics of rural areas and efficiently and stably treat rural domestic sewage.

[0006] The embodiment of the present application is implemented as follows:

[0007] The embodiment of the present application provides a sequencing batch rural domestic sewage treatment device, characterized in that the device comprises a pool body, the pool body is divided into a pre-reaction zone and a main reaction zone by a partition plate, the bottom of the partition plate is provided with a water passing hole for connecting the pre-reaction zone and the main reaction zone, a water inlet pipe is arranged on the upper part of the side wall of the pre-reaction zone, and a drainage pipe is arranged on the upper part of the side wall of the main reaction zone; a sludge discharge pipe is arranged in the main reaction zone and extends into the lower part, and the sludge discharge pipe is provided with a sludge backflow pipe extending into the upper part of the pre-reaction zone.

[0008] In some optional embodiments, biological fillers are arranged in the middle parts of the pre-reaction zone and the main reaction zone.

[0009] In some optional embodiments, an aeration device is arranged in the lower part of the main reaction zone, and the aeration device is connected with an external air blower through an aeration pipe.

[0010] In some alternative embodiments, the upper region of the main reaction zone is provided with a high liquid level line and a low liquid level line, and liquid level meters are arranged at the high liquid level line and the low liquid level line, respectively.

[0011] In some alternative embodiments, the drain pipe is connected to a drain gas pipe, and the drain gas pipe is connected to the fan.

[0012] In some alternative embodiments, the sludge discharge pipe is connected to a backflow gas pipe, and the backflow gas pipe is connected to the fan.

[0013] In some alternative embodiments, electromagnetic valves are arranged on the aeration pipe, the drain gas pipe and the backflow gas pipe.

[0014] The beneficial effects of the present application are as follows: 1. The present application provides a sequencing batch rural domestic sewage treatment device, which can integrate homogenization, primary sedimentation, biodegradation, secondary sedimentation and other functions in one tank, and is particularly suitable for rural areas with intermittent discharge and large flow variation; 2. The pre-reaction zone is arranged in front of the main reaction zone, which can realize continuous water feeding and improve the biodegradability of the sewage. The backflow sludge can improve the microbial concentration in the pre-reaction zone and improve the pretreatment effect; 3. The main reaction zone adopts the aeration-rest-drain sequencing batch reaction mode, and through time sequence control, the system can realize the switching reaction of oxygen, anoxia and anaerobic carbon, nitrogen and phosphorus removal in one tank, and the reaction tank occupies less space; 4. Oxidation and reduction reactions are carried out in one tank, and the microbial diversity is richer, which can fully exert the synergistic effect of different functional microorganisms, and can perform new and efficient biochemical reactions such as denitrifying phosphorus removal, anaerobic ammonia oxidation and short-cut denitrification, and the treatment effect is better; 5. No special sedimentation tank is needed, and the sedimentation time is ensured through static sedimentation, so that the effluent effect is better. At the same time, air-lift drainage, rather than traditional gravity drainage, can better prevent sludge loss, and is more suitable for low-concentration domestic sewage treatment in rural areas. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0016] Figure 1 The structure of the embodiments of the present application is shown in the accompanying drawings. DETAILED DESCRIPTION

[0017] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0019] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0020] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0021] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0022] The features and performances of the present application will be further described in detail below in combination with the embodiments.

[0023] As Figure 1As shown, the present application provides a sequencing batch rural domestic sewage treatment device, which comprises a pool body 1, the pool body is divided into a pre-reaction zone 3 and a main reaction zone 4 by a partition 2, the bottom of the partition is provided with a water passing hole 5 for connecting the pre-reaction zone and the main reaction zone; the upper part of the side wall of the pre-reaction zone is provided with a water inlet pipe 6, and the upper part of the side wall of the main reaction zone is provided with a water outlet pipe 7; a sludge discharge pipe 8 extending into the lower part is arranged in the main reaction zone, and the sludge discharge pipe is provided with a sludge backflow pipe 9 extending into the upper part of the pre-reaction zone.

[0024] The middle parts of the pre-reaction zone and the main reaction zone are both provided with biological fillers 10, and the microorganisms in the sewage gradually adhere to the biological fillers to form a biofilm.

[0025] The lower part of the main reaction zone is provided with an aeration device 11, the aeration device is connected with an external fan through an aeration pipe 12, and the aeration device provides sufficient oxygen for the growth of the biofilm.

[0026] The upper part of the main reaction zone is provided with a high liquid level line 13 and a low liquid level line 14, and liquid level meters are arranged at positions corresponding to the high liquid level line and the low liquid level line. When the sewage in the main reaction zone continuously flows in and reaches the highest liquid level line, the aeration system starts to aerate and oxygenate, the treated sewage is discharged outside the device, and the water level in the main reaction zone drops to the low liquid level line, and the water discharge is stopped.

[0027] The water outlet pipe is connected with a water outlet gas pipe 15, the water outlet gas pipe is connected with the fan, and the water is discharged by air lifting. The sludge discharge pipe is connected with a backflow gas pipe 16, the backflow gas pipe is connected with the fan, and the backflow is air lifted.

[0028] The aeration pipe, the water outlet gas pipe and the backflow gas pipe are all provided with electromagnetic valves.

[0029] The treatment process of the system is as follows: the domestic sewage of farmers is introduced into the pre-reaction zone of the device through self-flow or pump lifting, biological fillers are arranged in the pre-reaction zone, the microorganisms in the sewage gradually adhere to the biological fillers to form a biofilm, and the sludge backflow in the main reaction zone continuously supplements the microorganisms in the pool. The microorganisms convert the refractory substances into easily degradable substances through anaerobic reaction in the anaerobic environment, further improve the biodegradability of the sewage, and the polyphosphorus bacteria release a small amount of phosphorus in the anaerobic environment to prepare for aerobic phosphorus absorption. In this process, a part of the organic matter is degraded, and the organic load of the subsequent reaction is reduced. At the same time, the pre-reaction zone can play a role in uniforming water quality and water quantity, and reducing the impact load of the system.

[0030] After the sewage is pre-reacted, it is introduced into the main reaction zone through the opening in the lower part of the reaction zone, biological fillers are arranged in the main reaction zone to enrich and grow biofilm, the biofilm has a certain thickness, and an oxygen gradient is formed from the inside to the outside to form an anaerobic-anoxic-aerobic microenvironment, and different microorganisms can cooperatively complete the organic matter degradation and the denitrification and phosphorus removal of the sewage.

[0031] The aeration device is installed at the lower part of the main reaction zone to provide oxygen for the growth of biofilm. The wastewater continuously flows into the main reaction zone, and when the highest liquid level line is reached, the aeration system starts to aerate and oxygenate. The biofilm and free activated sludge use a large amount of oxygen to decompose organic matter, at the same time, ammonia nitrogen is oxidized to nitrate nitrogen by nitrifying bacteria, and phosphorus is absorbed by phosphorus-accumulating bacteria under aerobic conditions, and the phosphorus in the wastewater is transferred to the bacterial body for storage. The aeration reaction lasts for 2-4 hours, and then the aeration is stopped. At this time, the anaerobic reaction starts in the main reaction zone, and the nitrate nitrogen is denitrified by denitrifying bacteria to generate nitrogen gas, which escapes from the water body, achieving denitrification of the system. At the same time, the free activated sludge naturally settles to achieve separation of sludge and water. After 2 hours of stopping aeration, the air pipe starts to supply air, and the treated wastewater is lifted and discharged outside the equipment under the action of air lifting until the water level in the main reaction zone drops to the low liquid level line, and the air lifting and water discharge are stopped.

[0032] The sludge return system is provided from the main reaction zone to the pre-reaction zone. Normally, the sludge is mainly returned to the pre-reaction zone by air lifting to supplement the sludge concentration therein, and the remaining sludge is discharged to the sludge storage tank through the sludge discharge pipe, at the same time, achieving phosphorus removal of the system. This process is repeated continuously to achieve the sequencing batch treatment of domestic wastewater.

Claims

1. A sequencing batch rural domestic sewage treatment device, characterized in that, The application relates to a sewage treatment device, which comprises a pool body, a pre-reaction area and a main reaction area, a water passing hole in the bottom of a partition plate, a water inlet pipe on the upper part of the side wall of the pre-reaction area, a water outlet pipe on the upper part of the side wall of the main reaction area, a sludge discharge pipe extending into the lower part of the main reaction area, and a sludge backflow pipe extending into the upper part of the pre-reaction area.

2. The apparatus according to claim 1, wherein the apparatus is characterized by: The middle parts of the pre-reaction area and the main reaction area are provided with biological fillers.

3. The apparatus according to claim 2, wherein the apparatus is characterized by: The lower part of the main reaction area is provided with an aeration device connected with an external fan through an aeration pipe.

4. The apparatus according to claim 3, wherein the apparatus is characterized by: The upper part of the main reaction area is provided with a high liquid level line and a low liquid level line, and liquid level meters are arranged at the positions corresponding to the high liquid level line and the low liquid level line.

5. The apparatus according to claim 3 or 4, characterized in that, The water outlet pipe is connected with a water outlet air pipe connected with the fan.

6. The apparatus according to claim 5, wherein the apparatus is characterized by: The sludge discharge pipe is connected with a backflow air pipe connected with the fan.

7. The apparatus according to claim 6, wherein the apparatus is characterized by: The aeration pipe, the water outlet air pipe and the backflow air pipe are all provided with electromagnetic valves.

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