Combined biological ball filler for sewage treatment and application thereof

Abstract

The application discloses a combined biological ball filler for sewage treatment, which comprises an outer frame body and a filler, the outer frame body is a hollow sphere, the filler is filled in the inner part of the outer frame body, the filler is aldehyde fiber silk, one end of the aldehyde fiber silk is fixed to the inner surface of the outer frame body, and the spherical surface of the outer frame body is a sawtooth structure with a hollow design. Compared with the prior art, the sawtooth grid shell is adopted, the sawtooth hollow design can achieve the purpose of uniform water and gas distribution, water and gas can be fully exchanged in the biological membrane, and organic matters in water can be efficiently treated. Meanwhile, the aldehyde fiber silk is arranged in the filler ball, and one end of the aldehyde fiber silk is fixed to the inner surface of the biological ball, so that the problems, such as too dense biomass on the surface of the filler, poor oxygen mass transfer in the biological membrane and influence on biological activity, are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewage treatment, in particular to a combined biological ball filler for sewage treatment. BACKGROUND

[0002] Now the development of biological membrane technology is very mature, the filler used in biological membrane method plays a crucial role in sewage treatment effect. Different types of membrane-attached fillers are designed according to different needs, the four most commonly used types are: suspended flow state filler, biological dense filler, microbial immobilized filler and structural filler. However, some biological filler devices have the disadvantages of slow membrane-attached speed, small amount of membrane-attached, complicated arrangement process and low oxygen utilization rate.

[0003] For example, the traditional biological ball filler usually includes a net-shaped ball and a sponge filled in the net-shaped ball. The sponge is easy to be caked when encountering sludge during filtration, which reduces the oxygen mass transfer efficiency. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a biological ball filler with fast membrane-attached speed, large amount of membrane-attached and simple arrangement, which can effectively improve the oxygen transfer rate and utilization rate.

[0005] In order to achieve the above purpose, the technical scheme of the present application is as follows:

[0006] A combined biological ball filler for sewage treatment, comprising an outer frame and a filler, the outer frame is a hollow sphere, the filler is filled in the inside of the outer frame, the filler is aldehyde fiber, one end of the aldehyde fiber is fixed to the inner surface of the outer frame, and the spherical surface of the outer frame is a sawtooth structure with a hollow design.

[0007] Further, the outer frame comprises a first half-sphere and a second half-sphere connected in a detachable manner, the first half-sphere comprises a warp and weft grid frame, and a branch body arranged in the warp and weft grid, the branch body is sawtooth-shaped, and the warp and weft grid frame is a mesh structure composed of a plurality of arc segments and a plurality of fixed rings.

[0008] Further, the inner surface of the outer frame is provided with a plurality of fixed points, a plurality of aldehyde fiber filaments form an aldehyde fiber bundle, the filler comprises a plurality of groups of aldehyde fiber bundles, the aldehyde fiber bundle has a connecting end and a free end, and the connecting end of each aldehyde fiber bundle is fixed to each fixed point in a one-to-one correspondence.

[0009] Further, the length of the aldehyde fiber is 50-80mm, and the diameter of the outer frame is 100-160mm.

[0010] Further, the size of the hollow gap of the outer frame is 0.5-1mm 2 .

[0011] Further, the filling volume of the filling material is 50-70% of the hollow volume of the outer frame.

[0012] Further, the outer frame is formed by polyolefin injection molding.

[0013] Further, the polyolefin includes at least one of polyethylene, polypropylene, polybutylene, polybutadiene, polyisoprene and styrene.

[0014] Further, for the repair of the environmental water body.

[0015] Further, the environmental water body includes urban municipal sewage, rural domestic sewage, industrial wastewater or rivers and lakes.

[0016] After the above technical scheme, the combined biological ball filler for sewage treatment has the following beneficial effects: the sawtooth-shaped grid shell provides a carrier for microbial growth, and the sawtooth-shaped hollow design can achieve the purpose of uniform water and air distribution, so that water and air are fully exchanged in the biological membrane, and organic matter in water is efficiently treated. At the same time, the filler ball is also provided with aldehyde fiber filaments, which are fixed at one end of the inner surface of the biological ball due to their unique arrangement, solving the problem of poor oxygen mass transfer in the biological membrane due to excessive microbial biomass on the surface of the filler, affecting biological activity and other problems. The aldehyde fiber filaments have good hydrophilicity and density close to water, are flexible, can achieve good flow state in water, have good wettability, high porosity, strong pollution interception capacity, easy to form biofilm, strong microbial adsorption capacity, can significantly shorten the start-up time of the biochemical system during use, improve the treatment effect, and have high specific surface area and strong mechanical strength, which can provide a large attachment area for microorganisms, and have good wear resistance and low loss during long-term wastewater treatment. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the combined biological ball filler for sewage treatment of the present application;

[0018] Figure 2 is an exploded structural schematic view of the outer frame in the present application (omitting the aldehyde fiber filaments);

[0019] Figure 3 is an internal structural schematic view of the first hemispherical body in the present application;

[0020] Figure 4 is a structural schematic view of the aldehyde fiber filament bundle in the present application;

[0021] Figure 5The ammonia-nitrogen treatment effect diagram of the decentralized rural sewage in the application;

[0022] Figure 6 The COD treatment effect diagram of the decentralized rural sewage in the application.

[0023] In the figure:

[0024] The outer frame body-1; the first hemisphere-11;

[0025] The branch body-111; the circular arc segment-112;

[0026] The fixed ring-113; the second hemisphere-12;

[0027] The buckle structure-13; the aldehyde fiber filament-2. DETAILED DESCRIPTION

[0028] In order to further explain the technical scheme of the application, the application will be described in detail below through specific embodiments.

[0029] I. Filler

[0030] The application discloses a combined biological ball filler for sewage treatment, as shown in the figure, which comprises an outer frame body 1 and a filler. Figures 1-3 The outer frame body 1 is a hollow sphere, the filler is filled in the inside of the outer frame body 1, the filler is an aldehyde fiber filament 2, one end of the aldehyde fiber filament 2 is fixed to the inner surface of the outer frame body 1, and the spherical surface of the outer frame body 1 is a sawtooth structure with a hollow design.

[0031] Specifically, the size (area) of the hollow gap of the outer frame body 1 is 0.5-1mm 2 . The length of the aldehyde fiber filament 2 is 50mm-80mm, and the diameter of the outer frame body 1 is 100mm-160mm. The outer frame body 1 is formed by injection molding of polyolefin through a specially designed mold. The polyolefin can be selected from at least one of polyethylene, polypropylene, polybutylene, polybutadiene, polyisoprene and styrene.

[0032] As a preferred embodiment, the outer frame body 1 comprises a first hemisphere 11 and a second hemisphere 12 connected in a detachable manner, and the first hemisphere 11 and the second hemisphere 12 can be connected by using a conventional buckle structure 13. As long as the corresponding connection can be achieved, detailed description is not given here. The main body structure of the first hemisphere and the second hemisphere is the same, and the first hemisphere is taken as an example for description.

[0033] The first hemisphere 11 comprises a warp and weft grid frame body and a branch body 111 arranged in the warp and weft grid, and the branch body 111 is connected with the warp and weft grid. The branch body 111 is sawtooth-shaped and has the function of cutting bubbles, which facilitates uniform water and gas distribution. The warp and weft grid frame body is a mesh structure composed of a plurality of circular arc segments 112 and a plurality of fixed rings 113.

[0034] As a preferred embodiment, the inner surface of the outer frame 1 is provided with a plurality of evenly arranged fixing points, such as Figure 4 As shown, a plurality of aldehyde fibers 2 constitute aldehyde fiber bundles, the filler includes a plurality of groups of the aldehyde fiber bundles, the aldehyde fiber bundles have connecting ends and free ends, and the connecting ends of each of the aldehyde fiber bundles are fixed to each of the fixing points in a one-to-one correspondence. The free ends of the aldehyde fiber bundles can freely move in the hollow interior of the outer frame 1. The filling volume of the filler is 50-70% of the hollow volume of the outer frame, so as to ensure that the aldehyde fibers 2 can freely move in the hollow interior of the outer frame 1.

[0035] The combined biological ball filler for sewage treatment can be applied in urban municipal sewage, rural domestic sewage, industrial wastewater, and environmental water body repair of rivers and lakes.

[0036] The combined biological ball filler for sewage treatment adopts a sawtooth-shaped grid shell. The outer frame can provide a carrier for microbial growth, and the sawtooth-shaped hollow design can achieve the purpose of uniform water and air distribution, so that water and air are fully exchanged in the biofilm, and organic matter in water is efficiently treated. Meanwhile, the filler ball is provided with aldehyde fibers. Due to the unique arrangement form, one end is fixed to the inner surface of the biological ball, and the other end is a free end in the ball. The problems of excessive density of biomass on the surface of the filler, poor oxygen mass transfer in the biofilm, and influence on biological activity are completely solved. The aldehyde fibers have good hydrophilicity and density close to water, are flexible, and can achieve good flow state in water; have good wettability, high porosity, strong pollution interception capacity, easy to form a biofilm, strong microbial adsorption, can significantly shorten the start-up time of the biochemical system during use, and improve the treatment effect; meanwhile, the high specific surface area and strong mechanical strength can provide a large attachment area for microorganisms, and have good wear resistance and low loss in the long-term wastewater treatment process.

[0037] II. Water purification performance test of the filler

[0038] The combined biological ball filler is placed in a reaction tank, inoculated with active sludge or high-efficiency microbial agent, and after being filled with sewage, it is incubated for 2-3 days for microbial attachment and growth on the surface of the carrier. Then, continuous water feeding is started, the flow rate is increased every day, and after 7-10 days, the designed flow rate can be reached for continuous sewage treatment.

[0039] The combined biological ball filler of the application is used in the anoxic-oxygenation / membrane bioreactor (AO / MBR) device for treating decentralized rural sewage, which is composed of the combined biological ball filler of the application, a lifting pump, an aerator, a membrane assembly, a suction pump, a pressure gauge and other equipment. The water inlet of the device is the actual rural domestic sewage, and the start of the device is divided into three stages: (1) a smothering stage: smothering the AO / MBR device for 48 hours to make the microorganisms in the AO / MBR adhere to the filler; (2) continuous water inlet with small water volume: continuously feeding water with small water volume for 5-7 days to stabilize the biofilm on the filler; (3) normal water inlet continuous operation stage: adjusting the water volume to the designed water volume and continuously feeding water. The treatment effect of the stable operation is shown in Figure 5 and Figure 6 .

[0040] From the above experimental results, it can be seen that the removal rate of the entire system to COD is 85.49%, and the removal rate of ammonia nitrogen is 86.97%, and the system effectively consumes organic matter and removes ammonia nitrogen.

[0041] By comparing with the commercially available fillers, the performance and adsorption and membrane formation performance of the biological ball filler of the application are determined. Commercially available polyurethane sponge suspended ball filler 1 (hereinafter referred to as commercially available filler 1) and commercially available polyurethane sponge suspended columnar filler 2 (hereinafter referred to as commercially available 2) are purchased and compared with the application. The experiment is carried out in three groups of wide-mouth bottles with an effective volume of 5.0L, and three kinds of fillers are added to the three wide-mouth bottles according to the filling ratio of 30%. The experimental water sample is on-site rural domestic sewage, and the reactor is continuously aerated for 3 days. The inlet and outlet water of the reactor is controlled by a peristaltic pump, and the flow rate is 400mL / min, and the hydraulic retention time is 8h. After running for 30 days, the inlet and outlet water of each reactor is taken for determination, and the analysis results are as follows.

[0042]

[0043] As shown in the above table, the biological ball filler of the application is obviously superior to the commercially available filler 1 and the commercially available filler 2 in terms of the average removal rate of COD, the average removal rate of ammonia nitrogen, the dissolved oxygen content (DO) in water and the membrane formation amount per unit volume (mg / cm 3 ).

[0044] The above examples and drawings do not limit the product form and style of the application, and any appropriate changes or modifications made by ordinary skilled persons in the art shall be considered as not departing from the patent scope of the application.

Claims

1. A combined biological ball packing material for wastewater treatment, characterized in that: It includes an outer frame and a filler. The outer frame is a hollow sphere. The filler is filled inside the outer frame and is made of aldehyde-modified fiber filaments. One end of the aldehyde-modified fiber filaments is fixed to the inner surface of the outer frame. The spherical surface of the outer frame has a hollow, serrated structure. The inner surface of the outer frame is provided with several fixing points, and several aldehyde-modified fiber filaments constitute aldehyde-modified fiber bundles. The filling material includes several groups of aldehyde-modified fiber bundles. Each aldehyde-modified fiber bundle has a connecting end and a free end. The connecting end of each aldehyde-modified fiber bundle is fixed to each fixing point in a one-to-one correspondence. The free end of each aldehyde-modified fiber bundle can move freely inside the hollow interior of the outer frame. The filling volume of the filling material is 50-70% of the hollow volume of the outer frame. The length of the aldehyde-treated fiber filament is 50mm-80mm, and the diameter of the outer frame is 100mm-160mm; The size of the perforated gaps in the outer frame is 0.5-1mm. 2 .

2. The combined biological ball packing material for wastewater treatment as described in claim 1, characterized in that: The outer frame includes a first hemisphere and a second hemisphere that are detachably connected. The first hemisphere includes a latitude and longitude grid frame and branch bodies arranged in the latitude and longitude grid. The branch bodies are serrated. The latitude and longitude grid frame is a mesh structure composed of several arc segments and several fixed rings interwoven together.

3. The combined biological ball packing material for wastewater treatment as described in claim 1, characterized in that: The outer frame is injection molded from polyolefin.

4. The combined biological ball packing material for wastewater treatment as described in claim 3, characterized in that: The polyolefin includes at least one of polyethylene, polypropylene, polybutene, polybutadiene, polyisobutylene, and styrene.

5. An application of the combined biological ball packing material for wastewater treatment as described in claim 1, characterized in that: Used for the remediation of environmental water bodies.

6. The application of the combined biological ball packing material for wastewater treatment as described in claim 5, characterized in that: The environmental water bodies include urban municipal sewage, rural domestic sewage, industrial wastewater, or rivers and lakes.

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