WO2023197640A1

WO2023197640A1 - Energy-saving self-oxygenation distributed biofilm sewage treatment apparatus

Info

Publication number: WO2023197640A1
Application number: PCT/CN2022/137840
Authority: WO
Inventors: 刘长青; 栾亚男; 殷悦; 张峰; 安昱宁
Original assignee: 青岛理工大学
Priority date: 2022-04-12
Filing date: 2022-12-09
Publication date: 2023-10-19
Also published as: CN114772710A

Abstract

Disclosed in the present invention is an energy-saving self-oxygenation distributed biofilm sewage treatment apparatus, relating to the field of sewage treatment devices. The present invention comprises an integrated treatment apparatus housing, a reaction tank body and a rotating biological cage structure, wherein the rotating biological cage structure comprises a mesh filler cage body, biofilm fillers, and porous partitions which carry the biofilm fillers to fall into water for self-oxygenation. During the slow rotation of the rotating biological cage, the porous partitions carry the fillers to fall into water to realize a self-oxygenation process, thus solving the problem of energy consumption caused by air blowing and aeration used for sewage treatment at the current stage. The device of the present invention is simple and easy to operate, involves a self-oxygenation process with low energy consumption, and has a large biomass, a high load impact resistance and generally low operation costs. Therefore, the present invention is expected to be widely used in economically underdeveloped rural areas where there are great fluctuations in water quality and water quantity, dispersed distribution, and a lack of professionals to perform maintenance.

Description

An energy-saving self-oxygenating dispersed biofilm sewage treatment device

Technical field

The invention relates to the field of sewage treatment devices, and in particular to an energy-saving self-oxygenating dispersed biofilm sewage treatment device.

Background technique

Over the past 40 years of reform and opening up, our country has developed rapidly. At the same time, increasing environmental protection efforts have also improved the current situation of environmental pollution. The urban sewage treatment rate has reached more than 97%. As a large agricultural country, my country's rural sewage treatment system has developed slowly. The daily output of wastewater in rural areas is about 21 million to 24 million tons. With the implementation of the country's new rural policy, rural living standards continue to improve, and rural wastewater daily output Production is also increasing. Due to the wide geographical scope of rural areas, the dispersed population distribution, and the large differences in development conditions between villages in different regions, the water quality and quantity of domestic sewage vary greatly and fluctuate greatly over time, which has a negative impact on the sewage treatment system. Big impact. Currently, rural sewage treatment stations that have been built are mostly maintained by the village. The relatively complex sewage treatment process is not applicable in rural areas where there is a lack of professional and technical personnel. As a result, domestic rural sewage treatment facilities are commonly idle and out of operation. In addition, under the circumstances of financial constraints at the grassroots level, existing rural sewage treatment technology generally has the characteristics of high energy consumption, which is not conducive to the long-term stable operation of rural sewage treatment equipment.

At present, the small-scale decentralized sewage treatment processes in rural areas of my country mainly use A2O, oxidation ditch, MBBR (moving bed biofilm reactor), biological turntable, constructed wetland, duckweed pond and ecological filter. However, the existing technology has common problems such as excessive aeration, high energy consumption, high operating costs, complex processes, difficult maintenance, large floor space, and the outlet water quality is greatly affected by fluctuations in incoming water. Among them, MBBR is a technology that is more suitable for rural sewage treatment needs. Its principle is to use suspended fillers as biofilm carriers and put them into good/anoxic reactors according to a certain proportion. The suspended fillers are used for water flow, aeration and stirring in the system. A fluidized state is formed under the action of the filler. The fluidization process of the filler can fully contact the sewage. Microorganisms are more likely to attach and grow on the filler with a high specific surface area, thereby achieving better treatment results. Compared with the shortcomings of the biological turntable process, such as easy shedding of biofilm, low processing efficiency, complex equipment structure and difficulty in maintenance, MBBR has the characteristics of high volumetric load, good denitrification effect, strong biofilm resistance to load impact, small footprint, and large biomass. and other advantages, it is currently widely used in urban sewage plants.

The current MBBR process mostly uses excessive aeration to meet the effluent quality requirements, resulting in higher aeration energy consumption, operating costs and aeration equipment carrying loads, which increases equipment failure rates and maintenance costs. How to use the advantages of MBBR technology Applying it to the treatment of rural domestic sewage under the conditions of low energy consumption and low operating cost has become an urgent problem to be solved.

Contents of the invention

In view of the problems existing in the existing rural sewage treatment technology, such as complicated processes, the need for professional maintenance, high aeration energy consumption, and high operating costs, the present invention constructs an energy-saving self-oxygenating dispersed biofilm sewage treatment device, which can effectively effectively solve the problems raised in the above background technology.

In order to solve the above problems, the present invention adopts the following technical solutions:

Energy-saving self-oxygenating dispersed biofilm sewage treatment device, including an integrated shell, a reaction tank with a cover on the top, a drive motor box installed on the right side of the reaction tank, a drive motor installed inside the motor box, and a drive motor installed on the drive The drive shaft on the motor, the distribution box installed outside the motor box, and the biological cage installed on the drive shaft.

The biological cage includes a mesh cylindrical packing cage and a porous chassis on the left and right sides. The cylindrical cage is made of stainless steel with an opening rate of 70%-80%. The mesh aperture size is 3-8mm. The porous chassis on the left and right sides are open. The porosity is 30%-50%, and the pore size is 3-5mm.

The biological cage includes filler in the cage. The filler is attached with biofilm for biological denitrification. The filler filling rate is 40%-80% of the effective volume of the reaction tank.

Further, porous partitions are provided at corresponding positions on the inner wall of the biological cage. The length of the partitions is consistent with the cylindrical cage body, the width is 1/6-1/4 of the diameter of the cage body, and the opening rate is 60%-75%. The hole diameter is 3-5mm, and fixed slots are provided at the connection between the partition and the chassis on the left and right sides for fixing and removing the partition.

Furthermore, a quarter of the biological tumbling cage is an openable and closable cage. Three stainless steel hinges are installed on one side of the opening and closing cage to connect with the tumbling cage. Stainless steel fixing buckles are welded on the other side and the corresponding position of the tumbling cage. , and equipped with stainless steel butterfly bolts for fixation. The chassis on both sides of the biological cage is provided with square buckles for fixing the drive shaft. The opening size corresponds to the thickness of the drive shaft and is locked on the drive shaft through bolts. The biological cage is connected to the motor through the drive shaft.

Furthermore, the reaction tank with a cover plate on the top is equipped with a stainless steel hinge that can be opened to facilitate observation, opening and maintenance.

Furthermore, the upper part of the integrated housing is provided with a water inlet pipe and an overflow outlet pipe, and the lower part is provided with a vent pipe and a drainage pipe groove. The position and number of the inlet and outlet pipes can be changed according to the water inlet and outlet mode and water level requirements.

Furthermore, the top cover of the drive motor box is equipped with a stainless steel hinge to facilitate opening and maintenance.

Furthermore, the drive motor should be a slow speed adjustable motor and can be driven by solar energy to further save electric energy and reduce operating costs.

The size of the reaction tank and biological cage of the above-mentioned energy-saving self-oxygenating dispersed biofilm sewage treatment device can be reasonably designed and adjusted according to the actual sewage treatment water volume demand. The filler in the biological cage can be made of high-density polyethylene, Polyurethane sponge, bio-ball filler and other different types of fillers. At the same time, the opening size of the mesh cylindrical cage should not be larger than the filler diameter or the minimum side length.

Compared with the existing technology, the beneficial effects of the present invention are as follows:

1. When the energy-saving self-oxygenating dispersed biofilm sewage treatment device of the present invention slowly rotates through the filler cage, the porous partitions in the cage carry part of the biological filler out of the water surface, and during the slow rotation process driven by the motor, the porous partitions on the porous partitions The biological filler falls into the reaction pool, and brings in oxygen from the air during the falling process, realizing the self-oxygenation process of the reaction pool. At the same time, the porous partition at the opposite position has brought another part of the biological filler into the air, which can achieve a continuous self-oxygenation process, and different quantities and positions can be designed according to the different requirements for the size of dissolved oxygen in the actual sewage treatment process. The porous partition card slot allows the regulation of dissolved oxygen by increasing or decreasing the number of partitions and installing partitions at different positions.

2. The biofilm filler used in the present invention has a large specific surface area, large biomass, sufficient space for microbial growth, strong load impact resistance, and can better adapt to rural domestic sewage with large changes in water quality and quantity. During the slow rotation and oxygenation process of the biological cage, part of the filler is suspended on the water surface, which reduces the driving resistance of the motor, further saves energy consumption and reduces operating costs.

3. The openable and closable biological turret of the present invention provides convenience for staff to replace fillers and perform maintenance and repair. The immersion depth of the biological turret can be flexibly set according to different processing requirements and different processing scenarios. The difficulty of equipment maintenance is low. For the village Non-professionals can take up the job with simple training.

4. The new self-oxygenating dispersed biofilm sewage treatment device of the present invention has simple operation, less equipment, low failure rate, and convenient maintenance. It abandons traditional blasting and aeration equipment, which greatly reduces operating energy consumption and operating costs.

5. The energy-saving self-oxygenating dispersed biofilm sewage treatment device of the present invention is more flexible in applicability scenarios and can be flexibly combined with other treatment processes and different types of reactors to be used in areas with backward basic economic levels, large fluctuations in water quality and quantity, Scattered rural areas, remote areas and temporarily built prefabricated houses will have broad application prospects in the field of low energy consumption decentralized sewage treatment.

Description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used to describe the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention and are not relevant to the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of an energy-saving self-oxygenating dispersed biofilm sewage treatment device of the present invention;

Figure 2 is a top view of the biological cage in the open state;

Figure 3 is the left side view of the biological cage;

Figure 4 is a schematic diagram of the self-oxygenation operation during the rotation of the biological cage.

The labels in the drawings are explained as follows:

1-Integrated treatment device shell, 2-Reaction tank body, 3-Biological cage, 301-Openable mesh packing cage, 302-Cage hinge, 303-Porous partition, 304-Biofilm filler , 305-mesh cage, 306-porous chassis, 307-drive shaft buckle, 4-water inlet pipe, 5-inner liquid level, 6-drive shaft, 7-opening hinge, 8-transparent cover, 9 -Stainless steel fixed buckle, 901-stainless steel butterfly bolt, 10-motor box, 11-driving motor, 12-overflow pipe, 13-drain pipe, 14-drainage pipe trough, 15-distribution box.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Please refer to Figures 1-4. The energy-saving self-oxygenating dispersed biofilm sewage treatment device of the present invention includes an integrated treatment device housing 1, a sewage treatment reaction tank body 2, a biological cage structure 3, and a motor box located in the motor box 10. The drive motor 11 and the distribution box 15 outside the motor box 10 are driven.

The reaction tank body 2 is provided with an inlet pipe 4, an overflow outlet pipe 12 and an emptying pipe 13, and is provided with an openable and closable transparent cover 8. The arrangement of the transparent cover is conducive to real-time observation and opening of the biological cage 3. Overhaul. The reaction tank body 2 adopts an easy-to-process rectangular tank body, and the material is generally carbon steel anti-corrosion material, which has low cost.

The biological cage structure 3 includes a mesh filler cage 305, a biofilm filler 304, and a porous partition 303.

Among them, the left and right sides of the biological cage 3 are porous chassis 306, with an opening rate of 30% and a hole diameter of 5 mm. A square drive shaft buckle 307 is provided at the center of the porous chassis. The purpose of the square buckle is to make the packing cage drive The shaft rotates accordingly. The biological turret 3 is connected to the drive motor 11 by a transverse drive shaft 6 in the center. The position of the drive shaft 6 is located 3 to 5cm above the inner liquid level 5. The drive shaft can be adjusted according to the actual water drop situation of the biological turret 3. 6 position adjustment. The mesh filler cage 305 is mostly made of stainless steel with higher strength. The mesh cylindrical structure is conducive to uniform water distribution. The opening rate is 80% and the pore size is 8mm. One quarter of the mesh filler cage 305 is set to Open and close the cage body 301. The opening and closing part is connected to the cage body through a stainless steel hinge 302 to facilitate the addition and replacement of the filler. In the closed state, the stainless steel fixing buckle 9 and stainless steel butterfly bolts are welded to the biological cage 3. 901 for fixation. Porous partitions 303 are provided at relative positions on the inner wall of the biological turret 3. The porous partitions 303 are connected to the biological turret 3 through fixed slots on the left and right chassis, and can be increased or decreased according to the actual demand for the degree of oxygen drop. It is usually the same length as the biological cage 3, and the width is 1/5 of the diameter of the biological cage 3. Two rows of holes are opened at equal intervals, the opening rate is 65%, and the hole size is 5mm.

The biofilm filler 304 is a high-density polyethylene lightweight filler. The biofilm filler 304 has a biofilm attached to its surface, and the filling rate is set to 50% of the effective volume of the reaction tank 2 . The biofilm filler 304 can be used for microbial film culture before the device is operated, or activated sludge can be used in the biological cage 3 for microbial film culture.

The motor box 10 is mostly made of anti-corrosion stainless steel, and the motor box 10 is provided with a stainless steel hinge 7 for opening the cover. The distribution box 15 is mostly made of anti-corrosion stainless steel.

As shown in Figure 4: the biological cage 3 is driven by the motor 11, and as the drive shaft 6 slowly rotates in the clockwise direction at a speed of 10 rpm, the porous partition 303 will partially rotate out of the water. The biofilm filler 304 is carried out of the water surface 5. After reaching a certain height, the biofilm filler 304 carried out of the water surface by the porous partition 303 carries oxygen and falls to the water surface 5, and forms dissolved oxygen in falling water, completing the self-oxygenation process. At this time The porous partition 303 at the opposite position below the water surface 5 brings another part of the biofilm filler 304 out of the water surface 5 to ensure the continuity of the self-oxygenation process and continue to provide sufficient dissolved oxygen for the reaction tank 2 . During the slow rotation of the biological cage 3, part of the biofilm filler 304 is suspended below the water surface 5, which reduces the driving resistance of the motor 11 to a certain extent and further reduces the loss of electrical energy. Part of the biofilm filler 304 far away from the water surface 5 is in an anoxic state, realizing the simultaneous occurrence of aerobic and anoxic reactions in a single reaction tank.

This embodiment only uses the driving energy consumption of the motor to achieve the self-oxygenation goal, and the average dissolved oxygen level reaches 8.5 mg/L, which reduces the consumption of aeration energy for oxygenation in the biological treatment process of sewage. Significantly reduces power consumption and operating costs in the sewage treatment process.

The core technology of the present invention is that during the slow rotation process of the biological cage 3 filled with biofilm filler 304, part of the filler leaves the water surface and falls into the water to form dissolved oxygen in the falling water, completing the self-oxygenation process and eliminating the need for sewage organisms. The power consumed by the blast aeration system during the treatment process reduces operating costs. The biofilm filler 304 has a large specific surface area, which is conducive to the attachment and growth of denitrifying microorganisms. The unique structure of the biofilm filler 304 provides an excellent living environment for microorganisms. The large biomass and high microbial community richness make the microorganisms have strong The impact resistance of biofilm filler 304 with a certain thickness can form aerobic-anoxic-anaerobic oxygen environment changes in the micro-environment, which helps to form synchronized nitrification and denitrification, improve denitrification efficiency, and effectively ensure the quality of effluent water. Meet the standards. The rotation speed of the motor 11 and the immersion depth of the biological cage 3 of the present invention can be adjusted according to the actual oxygen demand and processing requirements. The operation is simple and the control mode is flexible. It can be flexibly combined with different processes according to the actual processing requirements and different processing scenarios. The field of wastewater treatment has broad prospects.

The above are only the preferred embodiments of the present invention. The preferred embodiments do not describe all the details in detail. The protection scope of the present invention is not limited to the above-mentioned embodiments, including the technical features in the claims. All belonging to this inventive idea The following technical solutions all belong to the protection scope of the present invention. It should be noted that for those skilled in the art, any modifications that do not depart from the principle of the present invention are also considered to be within the protection scope of the present invention.

Claims

An energy-saving self-oxygenating dispersed biofilm sewage treatment device, including an integrated treatment device shell (1), a sewage treatment reaction tank body (2), a biological cage structure (3) including a mesh filler cage (305) As well as the biofilm filler (304) filled inside, the drive motor (11) and the distribution box (15) installed in the motor box (10), it is characterized by:

The biological cage (3) is provided with a transverse driving shaft (6) in the center, and the left and right sides of the biological cage (3) are porous chassis (306) with square driving shaft buckles (307) at the center of the disk; the mesh filler cage ( 305) is a mesh cylinder filled with biofilm filler (304), and is provided with an openable and closable cage (301) equipped with a hinge (302). The opening and closing parts are fixed with buckles (9) and butterfly bolts. (901) is connected to the cage body, and the inner wall of the cage is provided with a porous partition (303) connected to the cage body through fixed slots.
An energy-saving self-oxygenating dispersed biofilm sewage treatment device according to claim 1, characterized in that a transverse drainage pipe groove (14) is provided at the bottom of the housing (1) of the integrated treatment device, and is integrated with a Sewage treatment reaction tank body (2), motor box (10) and distribution box (15).
An energy-saving self-oxygenating dispersed biofilm sewage treatment device according to claim 1, characterized in that the sewage treatment reaction tank body (2) is provided with a water inlet pipe (4) on one side, and is provided with a water inlet pipe (4) on the upper end of the other side. There is an overflow outflow pipe (12), a drain pipe (13) at the lower end, and an openable cover plate (8) at the top of the pool body.
An energy-saving self-oxygenating dispersed biofilm sewage treatment device according to claim 1, characterized in that the porous chassis (306) has an opening rate of 30%-50% and a pore diameter of 3-5mm; The opening rate of the packing cage (305) is 70%-80%, and the pore diameter is 3-8mm; the number of said porous partitions (303) is at least one, and the width is 1/6-1/4 of the diameter of the packing cage (305). The opening rate is 60%-75%, and the hole diameter is 3-5mm.
An energy-saving self-oxygenating dispersed biofilm sewage treatment device according to claim 1, characterized in that the type of biofilm filler (304) can be set to high-density polyethylene lightweight filler, polyurethane sponge filler, biofilm filler, etc. Ball filler.