Modular combined suspended filler moving bed bio-membrane reactor and use method

Abstract

The invention discloses a modular combined suspended filler moving bed bio-membrane reactor and a use method, the reactor comprises an aeration tank with a water inlet pipe, a water outlet pipe and a blow-down pipe, and a plurality of suspended filler units are mounted in the aeration tank in a suspended manner; the suspended filler unit comprises a bamboo basket and a plurality of bamboo balls mounted in the bamboo basket, the bamboo basket is formed by weaving bamboos, an opening is formed in the bamboo basket, and a plurality of meshes are formed in the other surfaces of the bamboo basket; the bamboo balls are hollowed-out and formed by weaving bamboos, and the outer diameter of each bamboo ball is larger than the hole diameter of each mesh of the bamboo basket; aeration equipment positioned below the suspended filler unit is laid at the inner bottom of the aeration tank; and the aeration equipment comprises an aeration disc and an air pipe. Based on the characteristics that moso bamboos are easy to form films, rich in source, low in cost and easy to obtain, the moso bamboos are used as raw materials for manufacturing the combined suspended filler, the cost is low, the film forming effect is good, and operation management is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to a modular combined suspended filler moving bed biofilm reactor and a use method thereof. Background Art

[0002] Moving bed biofilm reactor (MBBR) is a new and efficient sewage treatment technology that combines the advantages of activated sludge method and biofilm method. Its working principle is to add lightweight fillers to activated sludge, and through aeration stirring, the fillers are always in a suspended and moving state, mixed evenly with sewage and fully in contact with pollutants. Microorganisms attach to the surface of the fillers to form biofilms. Since the fillers move freely with the water flow and air flow in the reactor, a "mobile biofilm" is formed, so that bacteria and other microorganisms in the biofilm can efficiently use organic matter in sewage for metabolism, so as to achieve the purpose of removing pollutants in sewage. Fillers are the core component of MBBR reactors and the carrier of microbial growth. The performance of fillers has a significant impact on the attachment and reproduction of biofilms, and determines the diversity and biomass of microbial flora in biofilms. Fillers with excellent performance must have the following characteristics: good bioaffinity, good hydrophilicity, high porosity, large surface roughness, large specific surface area, cheap and easy to obtain, etc. The MBBR fillers currently used are mainly made of high-density polyethylene (HDPE), polyethylene (PE) and polypropylene (PP) and other polymer materials. They are light and easy to suspend, but they have the following main problems: 1. The poor hydrophilicity and bioaffinity of the filler lead to problems such as slow biofilm formation, small biofilm formation, and unsatisfactory sewage treatment effect during the startup and operation of MBBR. Modifying the surface of these fillers by physical and chemical methods can improve the hydrophilicity and bioaffinity to a certain extent, but the cost is greatly increased.

[0003] 2. The filler is directly placed into the reactor. Under the aeration, the movement of the filler in the reactor is uneven and it is easy to gather into piles. The filler is unevenly distributed in the entire reactor, which easily causes the existence of reaction dead corners in the reactor, reducing the volume utilization rate of the reactor and the biodegradation effect.

[0004] 3. The filler is freely dispersed in the sewage, and only a grid is set at the outlet of the aeration tank to prevent the filler from flowing out of the reactor with the water. When the filler needs to be replaced, it is extremely inconvenient to salvage and collect it, which makes the replacement of the filler time-consuming and laborious. Summary of the invention

[0005] Therefore, in order to solve the above-mentioned shortcomings of the current MBBR reactor, the present invention provides a modular combined suspended filler moving bed biofilm reactor and a method of use; based on the characteristics of bamboo being easy to form biofilm, abundant in source and inexpensive and easily available, the present invention utilizes bamboo as the raw material for making the combined suspended filler, which has low cost, good biofilm forming effect and convenient operation and management.

[0006] On the one hand, the present invention provides a modular combined suspended filler moving bed biofilm reactor, comprising an aeration tank having a water inlet pipe, a water outlet pipe and a vent pipe, wherein a plurality of suspended filler units are installed in the aeration tank by hanging; The suspended filler unit comprises a bamboo basket and a plurality of bamboo balls installed in the bamboo basket. The bamboo basket is woven from bamboo, has an opening on the top and a plurality of mesh holes on the other sides. The bamboo balls are hollow woven from bamboo, and the outer diameter of the bamboo balls is larger than the aperture of the mesh holes of the bamboo basket. An aeration device located below the suspended filler unit is laid on the inner bottom of the aeration tank, and the aeration device includes an aeration plate and an air pipe.

[0007] Optionally, the suspended filler unit is suspended on a suspension rod through a traction rope, and the suspension rod is installed on the aeration tank; one end of the traction rope is slidably installed on the suspension rod through a suspension ring. The suspension rod is used to fix the bamboo basket, and to remove and install the bamboo basket when replacing the filler.

[0008] Optionally, a mounting portion matching the suspension rod is provided in the aeration tank, and the mounting portion is a slot provided in the aeration tank or a connecting block having a slot fixedly connected to the aeration tank.

[0009] Optionally, the aeration tank is equipped with two or more suspension rods, each of which is suspended with one or more suspended filler units.

[0010] On the other hand, the present invention also provides a method for using a modular combined suspended filler moving bed biofilm reactor, comprising a manufacturing step, wherein the manufacturing step comprises: A bamboo basket and bamboo balls are formed by using bamboo strips, and a plurality of bamboo balls are placed in the bamboo basket to form a suspended filler unit, wherein the filler filling rate of the suspended filler unit is 30-40%; A certain number of suspended filler units are suspended by hangers in an aeration tank equipped with an aeration device to form a water treatment unit. One or more water treatment units form a water treatment module. When the number of water treatment units is greater than two, the water treatment units operate in parallel.

[0011] In one embodiment, the method of use further comprises an application step, which comprises filler pretreatment and biofilm inoculation; The method of filler pretreatment is: Add tap water to the aeration tank to the outlet pipe, soak the bamboo basket and the bamboo ball for a set time, then drain the water in the tank, add domestic sewage to the outlet pipe, and after soaking for a set time, discharge half of the sewage in the tank, and then add activated sludge of a set concentration for inoculation, wherein the amount of activated sludge added is half of the effective volume of the aeration tank; The method of inoculation and biofilm formation is: After the inoculated activated sludge is added to the aeration tank, aeration is turned on and aerated for a set time, then allowed to settle for a set time, and finally the supernatant is discharged, and domestic sewage is added to the outlet; The aeration-static sedimentation-discharge steps are restarted. After four cycles, continuous biofilm formation begins. Domestic sewage continuously enters the aeration tank. The microorganisms in the sewage continuously use the organic matter, ammonia nitrogen and phosphorus in the sewage to synthesize and proliferate. The proliferated microorganisms continue to attach and accumulate on the bamboo balls and bamboo baskets, thus forming a biofilm. When the removal rate of ammonia nitrogen in the sewage reaches the specified value, the biofilm formation is successful.

[0012] In one embodiment, sewage treatment begins after biofilm formation is successful. During biofilm formation and continuous sewage treatment, the aeration volume ensures that the dissolved oxygen reaches 2-3 mg / L, while the bamboo balls are allowed to move up and down and suspend in the pool, and the aeration volume is controlled at 2.5-3.5 L / min.

[0013] Compared with the traditional suspended filler moving bed biofilm reactor, the present invention has the following advantages: 1. Low cost; The suspended bamboo balls, bamboo baskets and supporting booms can all be made from local materials, with low raw material costs and simple processing and manufacturing, which can significantly reduce the construction cost of the reactor. Compared with plastic hollow spherical fillers of the same size, bamboo balls with a diameter of 5-6 cm are lighter, only 1 / 3-1 / 2 of the former, and are more easily stirred into a suspended state by bubbles and water flow, which can reduce aeration and stirring energy consumption and reduce operating costs.

[0014] 2. Good film-forming effect and improved biodegradation effect; The good hydrophilicity and bioaffinity of bamboo promote the attachment, growth and biofilm formation of microorganisms, increase the amount of biofilm, and thus improve the biodegradation effect.

[0015] 3. Modular combination packing, easy installation and replacement, flexible operation; A bamboo basket (including the bamboo balls in it) is an independent combined filler module, which can be transported to the site with pre-installed modules. When installing, it can be installed as a whole module. When replacing, just take out the bamboo basket as a whole, and the bamboo balls will not be lost. In addition, a module is also an independent mobile biofilm reactor. Several bamboo baskets form several reactors. In practical applications, the number of modules can be increased or decreased according to actual needs, or the size of the bamboo basket can be changed. It can flexibly adapt to the fluctuation of water volume and water quality requirements, adjust the treatment scale, ensure stable operation, and reduce energy consumption.

[0016] 4. No response blind spot; The bamboo ball is placed in a bamboo basket, which is combined with the bamboo basket to form a whole in the aeration tank. The moving range of the bamboo ball is within the bamboo basket, which effectively avoids the problem of local accumulation of a large amount of filler caused by scattered filler in the entire aeration tank, and also avoids the reaction dead corner.

[0017] 5. Green and environmentally friendly; The plastic fillers currently used in MBBR are discarded after replacement and are difficult to biodegrade, which has an adverse impact on the environment. The bamboo fillers of the present invention are made from local materials, and the processing and production process does not affect the environment. After being discarded, they can also be utilized as organic solid waste resources.

[0018] The invention is particularly suitable for use in areas rich in bamboo resources, providing a local sewage treatment method with low investment, simple construction, convenient management and economical efficiency, and also proposing a new technical approach for the application of bamboo in the field of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic plan view of the modular combined suspended filler moving bed biofilm reactor of the present invention; Figure 2 It is a longitudinal cross-sectional schematic diagram of the modular combined suspended filler moving bed biofilm reactor of the present invention; Figure 3 It is a schematic cross-sectional view of the modular combined suspended filler moving bed biofilm reactor of the present invention; In the figure: 1. water inlet pipe; 2. aeration tank; 3. bamboo basket; 4. bamboo ball; 5. slot; 6. lifting rod; 7. metal lifting ring; 8. traction rope; 9. metal hook; 10. water outlet pipe; 11. aeration facility; 12. vent pipe. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0021] In this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises", or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0022] As described in the background technology, the MBBR fillers currently used have the following main problems: 1. The poor hydrophilicity and bioaffinity of the filler lead to problems such as slow biofilm formation, small biofilm formation, and unsatisfactory sewage treatment effect during the startup and operation of MBBR. Modifying the surface of these fillers by physical and chemical methods can improve the hydrophilicity and bioaffinity to a certain extent, but the cost is greatly increased.

[0023] 2. The filler is directly placed into the reactor. Under the aeration, the movement of the filler in the reactor is uneven and it is easy to gather into piles. The filler is unevenly distributed in the entire reactor, which easily causes the existence of reaction dead corners in the reactor, reducing the volume utilization rate of the reactor and the biodegradation effect.

[0024] 3. The filler is freely dispersed in the sewage, and only a grid is set at the outlet of the aeration tank to prevent the filler from flowing out of the reactor with the water. When the filler needs to be replaced, it is extremely inconvenient to salvage and collect it, which makes the replacement of the filler time-consuming and laborious.

[0025] Based on the above reasons, this embodiment provides a modular combined suspended filler moving bed biofilm reactor, such as Figure 1-Figure 3 As shown, the reactor comprises an aeration tank having a water inlet pipe, a water outlet pipe and a vent pipe, in which a plurality of suspended filler units are installed by hanging; The suspended filler unit comprises a bamboo basket and a plurality of bamboo balls installed in the bamboo basket. The bamboo basket is woven from bamboo, has an opening on the top and a plurality of mesh holes on the other sides. The bamboo balls are hollow woven from bamboo, and the outer diameter of the bamboo balls is larger than the aperture of the mesh holes of the bamboo basket. An aeration pipe located below the suspended filler unit is laid on the inner bottom of the aeration tank.

[0026] Exemplarily, the bamboo basket is woven from bamboo strips with a width of 1.5-2 cm and a thickness of 2-3 mm, and its cross section is square. The bamboo basket is not sealed, and its five faces have irregular geometric meshes. The cross-sectional size and height of the bamboo basket should not be too large to avoid being too heavy. It is suitable for one person to install and disassemble. The present invention determines that the bamboo basket is 1 m high, the upper side length is 0.7 m, and the bottom side length is 0.6 m, so that the bamboo baskets can be stacked, which is convenient for storage and reduces space. The size of the bamboo basket mesh must be smaller than the diameter of the bamboo ball, that is, less than 4 cm, to prevent the bamboo ball from falling out of the hole, and at the same time it must be larger than 2 cm, in order to allow the sewage, activated sludge and aeration bubbles in the aeration tank to pass freely through the mesh, so that the substances in the tank are evenly mixed, and the weight of the bamboo basket can also be reduced.

[0027] The bamboo ball is woven from bamboo strips with a width of 6-7 mm and a thickness of 1-2 mm into a hollow bamboo ball with a diameter of 5-6 cm. The spherical surface has irregular geometric mesh holes, and the mesh holes of the bamboo ball are not less than 4 mm. The purpose is to allow water, activated sludge and aeration bubbles in the packing basket to freely pass through the mesh holes of the bamboo ball, so that the substances in the bamboo basket are evenly mixed, while reducing the weight of each bamboo ball, ensuring that the bamboo ball can move freely and suspend in the water under the stirring of the bubbles. At the same time, the mesh holes of the bamboo ball cannot be larger than 6 mm to avoid reducing the surface area of ​​the bamboo ball and reducing the amount of biofilm.

[0028] The suspended bamboo balls, bamboo baskets and hanging rods in the above technical features can all be made from local materials, with low raw material costs and simple processing and manufacturing, which can significantly reduce the construction cost of the reactor; compared with plastic hollow spherical fillers of the same size, bamboo balls with a diameter of 5-6 cm are lighter, only 1 / 3-1 / 2 of the former, and are more easily stirred into a suspended state by bubbles and water flow, which can reduce aeration and stirring energy consumption and reduce operating costs. At the same time, the good hydrophilicity and bioaffinity of bamboo promote the attachment and growth of microorganisms and the biofilm effect, and the bamboo baskets and bamboo balls formed by bamboo increase the amount of biofilm, thereby improving the biodegradation effect. At the same time, the reactor is a modular combination filler, which is easy to install and replace and flexible to operate.

[0029] In the above technical features, the aeration equipment (aeration plate and air pipe) firstly provides oxygen to the microorganisms in the biofilm to aerobically degrade pollutants in the sewage, and secondly, stirs the aeration bubbles and generates upward buoyancy to make the bamboo balls move and suspend in the bamboo basket.

[0030] The bamboo basket is used to fill the bamboo balls. In addition, the bamboo strips used to weave the bamboo basket can also be used as carriers for microorganisms to grow and inhabit, and biofilms are formed on both sides of the bamboo strips for biodegradation of pollutants in water.

[0031] The bamboo balls serve as carriers for microorganisms to grow and inhabit. Microorganisms can attach and grow on both sides of the bamboo strips to form biofilms. Secondly, through aeration and water flow agitation, the bamboo balls form a mobile and suspended biofilm that can fully contact pollutants in sewage, thereby achieving the purpose of efficient oxidation and decomposition of pollutants. In this way, the bamboo basket and the bamboo balls in the basket form a combined filler for microbial growth and pollutant degradation.

[0032] In order to facilitate the removal and installation of the bamboo basket when replacing the filler, in one embodiment, the suspended filler unit is suspended on a suspension rod by a traction rope, and the suspension rod is installed on the aeration tank; one end of the traction rope is slidably installed on the suspension rod through a lifting ring. A mounting portion matching the suspension rod is provided in the aeration tank, and the mounting portion is a slot provided in the aeration tank or a connecting block having a slot fixedly connected to the aeration tank. The bamboo basket is suspended on the suspension rod by a traction rope, and the traction rope is connected to the suspension rod by a lifting ring, so that the bamboo basket can be moved on the suspension rod through the lifting ring to change the hanging position, so that the bamboo basket with bamboo balls can be adjusted in position. The detachable installation of the suspension rod can be achieved through the slot, which is convenient for maintenance and on-site assembly.

[0033] In order to improve the treatment effect, in one embodiment, the aeration tank is equipped with two or more suspension rods, each of which is suspended with one or more suspended filler units. Figure 1 As shown, three suspension rods are installed in the aeration tank, and each suspension rod is equipped with two suspended filler units. This technical feature can improve the sewage treatment effect.

[0034] In another embodiment, a method for using a modular combined suspended filler moving bed biofilm reactor is provided, comprising a manufacturing step and an application step.

[0035] The production steps include: Step S100: forming a bamboo basket and bamboo balls using bamboo strips, and placing a plurality of bamboo balls in the bamboo basket to form a suspended filler unit.

[0036] Exemplarily, the combined suspended filler of each suspended filler unit consists of a bamboo basket and several bamboo balls placed in the bamboo basket. The bamboo basket is woven from bamboo strips with a width of 1.5-2 cm and a thickness of 2-3 mm. Its cross section is square, the bamboo basket is not sealed, and its five faces have irregular geometric meshes. The cross-sectional size and height of the bamboo basket should not be too large to avoid being too heavy. It is appropriate for one person to install and disassemble. The bamboo basket is 1 m high, with an upper side length of 0.7 m and a bottom side length of 0.6 m. The bamboo baskets can be stacked for easy storage and reduced floor space. The size of the bamboo basket mesh must be smaller than the diameter of the bamboo ball, that is, less than 4 cm, to prevent the bamboo ball from falling out of the hole, and at the same time larger than 2 cm. The purpose is to allow the sewage, activated sludge and aeration bubbles in the aeration tank to pass freely through the mesh, so that the substances in the tank are mixed evenly, and the weight of the bamboo basket can also be reduced.

[0037] The bamboo ball is woven from bamboo strips with a width of 6-7 mm and a thickness of 1-2 mm into a hollow bamboo ball with a diameter of 5-6 cm. The spherical surface has irregular geometric mesh holes, and the mesh holes of the bamboo ball are not less than 4 mm. The purpose is to allow water, activated sludge and aeration bubbles in the packing basket to freely pass through the mesh holes of the bamboo ball, so that the substances in the bamboo basket are evenly mixed, while reducing the weight of each bamboo ball, ensuring that the bamboo ball can move freely and suspend in the water under the stirring of the bubbles. At the same time, the mesh holes of the bamboo ball cannot be larger than 6 mm to avoid reducing the surface area of ​​the bamboo ball and reducing the amount of biofilm.

[0038] The filling rate is an important indicator of MBBR. Its size determines the specific surface area and biofilm amount of the suspended filler, which directly affects the treatment performance. A filling rate that is too low will reduce the biofilm amount and reduce the treatment effect. A filling rate that is too high will increase the resistance of air and water flow, which will not only increase the cost and energy consumption of the filler, but also reduce the mass transfer efficiency, thereby affecting the biodegradation effect. In this embodiment, according to the operating characteristics of the bamboo ball, the filling rate of the filler in each bamboo basket is determined to be between 30-40%.

[0039] Step S200, a certain number of suspended filler units are suspended in an aeration tank equipped with an aeration pipe through a hanger to form a water treatment unit. One or more water treatment units form a water treatment module. When the number of water treatment units is greater than two, the water treatment units are operated in parallel.

[0040] Exemplarily, the bamboo basket in each suspended filler unit is installed on a suspension rod through a metal ring, two traction ropes and four metal hooks. The bamboo basket is placed in a suitable position through the traction rope, and the bamboo basket can also be pulled one by one to the pool wall close to the reactor for free disassembly; two slots are respectively installed on the two pool walls in the longitudinal direction of the reaction, and the two ends of the suspension rod are respectively placed in the two slots. The suspension rod is made of a bamboo with a diameter of about 8-10 cm. The suspension rod is not fixed, which is convenient for taking out and replacing from the slot, as well as the placement of the bamboo basket. According to the amount of water to be treated and the treatment requirements, an aeration tank with a certain length is designed, and several pairs of slots are arranged along the length of the pool, and several suspension rods are placed. In order to ensure the safe use and convenient installation of each suspension rod, the length of each suspension rod is not more than 2 m, and two bamboo baskets can be placed on one rod. In practical applications, according to the amount of water to be treated and the treatment requirements, more than two water treatment units can be designed to run in parallel, and the net width of each aeration tank is 2 m. The distance between the bottom of the bamboo basket and the top of the aeration membrane plate at the bottom of the aeration tank should be between 15-20 cm. Avoid making it too small, which will cause the bubbles to scour the bottom of the bamboo basket too much, easily causing the biofilm at the bottom to fall off. Also avoid making it too large, which will reduce the volume utilization of the aeration tank.

[0041] In one embodiment, the application step includes filler pretreatment and biofilm inoculation.

[0042] The method of pretreatment of the filler is as follows: after the bamboo basket and the bamboo ball are installed and fixed on the suspension rod, tap water is added to the aeration tank to the outlet pipe, and the bamboo basket and the bamboo ball are soaked for 4-5 days, and then the water in the tank is drained, and then domestic sewage is added to the outlet pipe. After soaking for 4-5 days, half of the sewage in the tank is discharged, and then activated sludge is added for inoculation. The concentration of the activated sludge is 6000-7000 mg / L, and the amount added is half of the effective volume of the aeration tank.

[0043] The inoculation biofilm forming method comprises two stages: intermittent operation and continuous operation. After the inoculated activated sludge is added to the aeration tank, the aeration facility is turned on, aeration is performed for 6 hours, and then the biofilm is allowed to settle for 2 hours. Finally, the supernatant is discharged, and domestic sewage is added to the outlet pipe to restart a new cycle of aeration-sedimentation-discharge. After four cycles, continuous biofilm formation begins, and domestic sewage continuously enters the reactor. Microorganisms in the sewage continuously utilize organic matter, ammonia nitrogen and phosphorus in the sewage to synthesize and proliferate, and these pollutants are also degraded and purified. The proliferated microorganisms continuously attach and accumulate on the bamboo balls and bamboo baskets to form a biofilm. When the removal rate of ammonia nitrogen in the sewage reaches more than 70%, it indicates that the biofilm formation is successful and continuous sewage treatment can begin.

[0044] In one embodiment, the method for using the modular combined suspended filler moving bed biofilm reactor also includes controlling the amount of aeration, specifically: during the inoculation biofilm and continuous sewage treatment, the aeration gas volume is a key control parameter. The appropriate gas volume must not only ensure that the dissolved oxygen reaches 2-3 mg / L, but also requires the bamboo balls to move up and down and suspend in the pool. Excessive gas volume will produce a higher buoyancy, which will easily cause the bamboo balls to gather on the water surface and cannot evenly contact the sludge and bubbles in the water, resulting in high energy consumption and low mass transfer efficiency, while too low aeration volume cannot allow the bamboo balls to form a good mobile and suspended state, affecting the mass transfer and biodegradation effects. Combining these two factors, the aeration volume in the reactor of the present invention is controlled at 2.5-3.5 L / min.

[0045] In one embodiment, the method of using the modular combined suspended filler moving bed biofilm reactor also includes replacing the suspended filler unit and the suspension rod; specifically: after the combined filler has been used for a certain period of time, it needs to be replaced regularly, the bamboo balls and bamboo baskets are replaced every 6-7 months, and the supporting bamboo poles are replaced every 12 months.

[0046] In the experimental comparison, the modular combined suspended filler moving bed biofilm reactor described in the present invention was compared with the traditional activated sludge reactor, and the pollutant removal performance of the two reactors was compared under the same volume, the same influent water quality, the same hydraulic retention time, dissolved oxygen and temperature reaction conditions. The results showed that compared with the traditional activated sludge reactor, the reactor with the addition of bamboo baskets and bamboo balls combined suspended fillers had the removal rates of organic matter (CODcr), ammonia nitrogen (NH3-N), total nitrogen (TN) and total phosphorus (TP) in sewage increased by 17.9%, 20.9%, 28.3% and 26.8%, respectively.

[0047] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A modular combined suspended filler moving bed biofilm reactor, comprising an aeration tank having an inlet pipe, an outlet pipe and a vent pipe, characterized in that: A plurality of suspended filler units are installed in the aeration tank by hanging; The suspended filler unit comprises a bamboo basket and a plurality of bamboo balls installed in the bamboo basket. The bamboo basket is woven from bamboo, has an opening on the top and a plurality of mesh holes on the other sides. The bamboo balls are hollow woven from bamboo, and the outer diameter of the bamboo balls is larger than the aperture of the mesh holes of the bamboo basket. An aeration device located below the suspended filler unit is laid on the inner bottom of the aeration tank.

2. The modular combined suspended filler moving bed biofilm reactor according to claim 1, characterized in that: The suspended filler unit is suspended on a suspension rod through a traction rope, and the suspension rod is installed on the aeration tank; one end of the traction rope is slidably installed on the suspension rod through a suspension ring.

3. The modular combined suspended filler moving bed biofilm reactor according to claim 2, characterized in that: The aeration tank is provided with a mounting portion matched with the suspension rod, and the mounting portion is a slot provided in the aeration tank or a connecting block fixedly connected to the aeration tank and having a slot.

4. The modular combined suspended filler moving bed biofilm reactor according to claim 2, characterized in that: The aeration tank is equipped with two or more suspension rods, and each of the suspension rods is suspended with one or more suspended filler units.

5. The modular combined suspended filler moving bed biofilm reactor according to claim 1, characterized in that: The bamboo basket is woven from bamboo strips with a width of 1.5-2 cm and a thickness of 2-3 mm, and has a square cross section. The bamboo basket is not sealed, has a height of 1 m, a side length of 0.7 m at the top, and a side length of 0.6 m at the bottom; The mesh size of the bamboo basket is greater than 2 cm and less than 4 cm.

6. The modular combined suspended filler moving bed biofilm reactor according to claim 1, characterized in that: The bamboo ball is woven from bamboo strips with a width of 6-7 mm and a thickness of 1-2 mm into a hollow bamboo ball with a diameter of 5-6 cm. The spherical surface has mesh holes, and the mesh hole diameter of the bamboo ball is greater than or equal to 4 mm and less than or equal to 6 mm.

7. The modular combined suspended filler moving bed biofilm reactor according to any one of claims 5 or 6, characterized in that: The bamboo strips are moso bamboo strips.

8. A method for using the modular combined suspended filler moving bed biofilm reactor according to any one of claims 1 to 6, characterized in that: The method comprises the steps of: A bamboo basket and bamboo balls are formed by using bamboo strips, and a plurality of bamboo balls are placed in the bamboo basket to form a suspended filler unit, wherein the filler filling rate of the suspended filler unit is 30-40%; A certain number of suspended filler units are suspended by hangers in an aeration tank equipped with an aeration device to form a water treatment unit. One or more water treatment units form a water treatment module. When the number of water treatment units is greater than two, the water treatment units operate in parallel.

9. The method for using the modular combined suspended filler moving bed biofilm reactor according to claim 8, characterized in that: The invention also comprises an application step, which comprises filler pretreatment and biofilm inoculation; The method of filler pretreatment is: Add tap water to the aeration tank to the outlet pipe, soak the bamboo basket and the bamboo ball for a set time, then drain the water in the tank, add domestic sewage to the outlet pipe, and after soaking for a set time, discharge half of the sewage in the tank, and then add activated sludge of a set concentration for inoculation, wherein the amount of activated sludge added is half of the effective volume of the aeration tank; The method of inoculation and biofilm formation is: After the inoculated activated sludge is added to the aeration tank, aeration is turned on and aerated for a set time, then allowed to settle for a set time, and finally the supernatant is discharged, and domestic sewage is added to the outlet; The aeration-static sedimentation-discharge steps are restarted. After four cycles, continuous biofilm formation begins. Domestic sewage continuously enters the aeration tank. The microorganisms in the sewage continuously use the organic matter, ammonia nitrogen and phosphorus in the sewage to synthesize and proliferate. The proliferated microorganisms continue to attach and accumulate on the bamboo balls and bamboo baskets, thus forming a biofilm. When the removal rate of ammonia nitrogen in the sewage reaches the specified value, the biofilm formation is successful.

10. The method for using the modular combined suspended filler moving bed biofilm reactor according to claim 9, characterized in that: After the biofilm is successfully formed, sewage treatment begins. During the period of biofilm inoculation and continuous sewage treatment, the aeration volume ensures that the dissolved oxygen reaches 2-3 mg / L. At the same time, the bamboo balls are allowed to move up and down and suspend in the pool, and the aeration volume is controlled at 2.5-3.5 L / min.

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