MBBR (Moving Bed Biofilm Reactor) filler structure

Abstract

The utility model relates to an MBBR (Moving Bed Biofilm Reactor) filler structure, which comprises an outer-layer structural body and an inner-layer structural body, the outer-layer structural body comprises an outer cylinder, a plurality of longitudinal convex ribs and a plurality of annular convex ribs are formed on the outer surface of the outer cylinder, the longitudinal convex ribs are distributed on the outer wall surface of the outer cylinder along the length direction of the outer cylinder, and the annular convex ribs are distributed on the outer wall surface of the outer cylinder along the length direction of the outer cylinder. The annular ribs are distributed on the outer wall surface of the outer cylinder along the circumferential surface; latticed pits are formed on the outer surface of the outer cylinder by the longitudinal convex ribs and the annular convex edges; the inner-layer structural body comprises an inner cylinder of which the diameter is gradually increased from inside to outside; the inner cylinder with the smallest diameter is arranged in the center, and the other inner cylinders are sequentially arranged from the inner ring to the outer ring; every two adjacent layers of inner cylinders are connected through rib plates arranged at intervals in a radial mode, and an isosceles trapezoid cavity with the fixed edge and the bottom edge being curved surfaces is formed between every two adjacent rib plates. According to the MBBR suspended filler, the specific surface area of the MBBR suspended filler is further increased, and the biofilm culturing speed of the MBBR suspended filler is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, and particularly relates to an MBBR filler structure. Background Art

[0002] The biological MBBR process combines the advantages of the activated sludge process and the biofilm process, and the MBBR filler is the core of the process. The purpose of adding suspended fillers in the MBBR process is to use the suspended fillers as the habitats for microorganisms to survive, and to provide a protected attachment surface for the effective growth of microorganisms. That is, only the effective biofilm surface of the filler has the effect of removing pollutants. When the total effective surface area of the filler is certain, the larger the effective specific surface area, the smaller the filler volume, and the higher the treatment efficiency. In addition, the existing MBBR suspended fillers are usually integrally formed of PE or HDPE materials, and the internal surface is relatively smooth. Although the specific surface area is large, the film hanging speed is slow. Summary of the Invention

[0003] (1) Technical Problems to be Solved

[0004] In view of the above-mentioned disadvantages and deficiencies of the prior art, the utility model provides an MBBR filler structure, which further increases the specific surface area of the MBBR suspended filler and improves the biofilm hanging speed of the MBBR suspended filler.

[0005] (2) Technical Solutions

[0006] The utility model provides an MBBR filler structure, which includes an outer structure body and an inner structure body. The outer structure body includes an outer cylinder, and a plurality of longitudinal ribs and a plurality of circumferential ridges are formed on the outer surface of the outer cylinder. The longitudinal ribs are distributed along the length direction of the outer cylinder on the outer wall surface of the outer cylinder, and the circumferential ridges are distributed along the circumferential surface on the outer wall surface of the outer cylinder. These longitudinal ribs and circumferential ridges form a grid-like concave pit on the outer surface of the outer cylinder. The inner structure body includes inner cylinders with diameters increasing from the inside to the outside. The inner cylinder with the smallest diameter is arranged at the center, and the other inner cylinders are arranged in sequence from the inner circle to the outer circle. The inner cylinders are connected by rib plates arranged at radial intervals between adjacent layers, and an isosceles trapezoidal cavity with a curved fixed side and a curved bottom is formed between adjacent two rib plates.

[0007] According to a preferred embodiment of the utility model, the diameter of the outer cylinder is 25 ± 0.5 mm, and the height is 10 ± 1 mm.

[0008] According to a preferred embodiment of the utility model, the effective specific surface area of the MBBR filler structure ≥ 820 m 2 / m 3 .

[0009] According to a preferred embodiment of the present utility model, the specific gravity of the MBBR packing structure is 0.94 - 0.97.

[0010] According to a preferred embodiment of the present utility model, the MBBR packing structure is integrally formed of HDPE material, and a polypropylene or polyethylene non-woven fabric is compounded on the inner surface of the MBBR packing structure.

[0011] (III) Beneficial effects

[0012] The MBBR packing structure of the present utility model has a large specific surface area, a specific gravity close to 1, and is easy to suspend, which is beneficial to the growth of microorganisms for degrading refractory organic matter, has a rich biological flora, good effluent water quality, an attached growth mode, is suitable for the growth of nitrifying bacteria, and has a high denitrification efficiency. The packing of the present utility model rotates freely and smoothly, increasing the impact and cutting of air bubbles in water, prolonging the residence time of air bubbles in water, improving the effective utilization rate of oxygen, and effectively reducing the oxygen supply energy consumption. The composite non-woven fabric can greatly increase the affinity of the biofilm, effectively accelerate the film formation speed, improve the attachment performance of the biofilm, can quickly adsorb nutrient elements such as carbon source or nitrogen source in the wastewater and be utilized by microorganisms, and improve the biochemical treatment effect of the wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the MBBR packing structure of a preferred embodiment of the present utility model.

[0014] Figure 2 It is a schematic diagram of the grid-shaped pits on the outer wall surface of the MBBR packing structure of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] In order to better explain the present invention for easy understanding, the present invention will be described in detail below with reference to the drawings through specific embodiments.

[0016] As Figure 1 shown is a schematic diagram of the end face of the MBBR packing structure of the present utility model. The MBBR packing structure includes an outer structure body and an inner structure body. The outer structure body includes an outer cylinder 1, and a plurality of longitudinal ribs 101 and a plurality of circumferential ridges 102 are formed on the outer surface of the outer cylinder 1. The longitudinal ribs 11 are distributed along the length direction of the outer cylinder on the outer wall surface of the outer cylinder, and the circumferential ridges 102 are distributed along the circumferential surface on the outer wall surface of the outer cylinder; these longitudinal ribs 101 and circumferential ridges 102 form grid-shaped pits on the outer surface of the outer cylinder 1 (as Figure 2 shown).

[0017] The inner structure includes an inner cylinder 12 with a diameter increasing from the inside to the outside; the inner cylinder 12 with the smallest diameter is arranged at the central position, and the other inner cylinders 12 are arranged in sequence from the inner circle to the outer circle. The adjacent two layers of inner cylinders 12 are connected by rib plates 121 arranged at radial intervals, and an isosceles trapezoidal cavity 122 with a curved fixed side and bottom side is formed between two adjacent rib plates 121. The adjacent two layers of rib plates 121 are arranged staggeredly, thereby increasing the stability and durability of the entire MBBR filler structure.

[0018] Among them, the outer cylinder has a diameter of 25 ± 0.5 mm and a height of 10 ± 1 mm. The effective specific surface area of the MBBR filler structure ≥ 820 m 2 / m 3 , and the specific gravity is 0.94 - 0.97.

[0019] Furthermore, the MBBR filler structure is integrally formed of HDPE material. A polypropylene or polyethylene non-woven fabric sleeve with a matching outer contour and open ends is inserted into each isosceles trapezoidal cavity 122 and the central inner cylinder 12. By pre-grinding the inner surfaces of the isosceles trapezoidal cavities 122 and the central inner cylinder 12 to roughen their surfaces, and then bonding them by hot melting, the polypropylene or polyethylene non-woven fabric sleeve is thermocompression bonded to the inner surfaces of each isosceles trapezoidal cavity 122 and the central inner cylinder 12, so that a layer of polypropylene or polyethylene non-woven fabric is compounded on the inner surface of the MBBR filler structure.

[0020] The inner wall of the MBBR filler made of HDPE material has good compatibility and adhesiveness with the polypropylene or polyethylene non-woven fabric sleeve, and the polypropylene or polyethylene non-woven fabric has good biocompatibility, which is very conducive to the rapid film formation of microorganisms and the enrichment of nutrient elements such as carbon sources or nitrogen sources in the wastewater for microorganisms to utilize. Although this structure will increase the production difficulty of the MBBR filler to a certain extent, during the wastewater treatment process, verified by small-scale laboratory tests, when the filling rate of the MBBR filler is 50%, after the same treatment time, the oxygen utilization rate can be increased by 7 - 8 percentage points, and the removal rate of nitrogen elements in the wastewater can be increased by 20 percentage points. As the use time of the MBBR filler structure increases and is affected by water flow impact, etc., the non-woven fabric on the inner surface of some fillers may fall off. At this time, regeneration treatment can be carried out, that is, the polypropylene or polyethylene non-woven fabric sleeve is inserted into the isosceles trapezoidal cavity 122 and the central inner cylinder 12 of the MBBR filler through a mold with a heating function, and after heating, the non-woven fabric sleeve is compounded on the inner walls of the isosceles trapezoidal cavity 122 and the central inner cylinder 12 of the MBBR filler to complete the regeneration.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A MBBR packing structure, characterized in that: The invention comprises an outer layer structure and an inner layer structure, wherein the outer layer structure comprises an outer cylinder, and a plurality of longitudinal convex ribs and a plurality of annular convex ridges are formed on the outer surface of the outer cylinder, wherein the longitudinal convex ribs are distributed on the outer wall surface of the outer cylinder along the length direction of the outer cylinder, and the annular convex ridges are distributed on the outer wall surface of the outer cylinder along the circumferential surface; these longitudinal convex ribs and annular convex ridges form grid-like pits on the outer surface of the outer cylinder; the inner layer structure comprises an inner cylinder whose diameter increases from the inside to the outside; the inner cylinder with the smallest diameter is arranged in the center, and the other inner cylinders are arranged sequentially from the inner circle to the outer circle; two adjacent layers of inner cylinders are connected by ribs arranged at radial intervals, and an isosceles trapezoidal cavity with fixed edges and bottom edges as curved surfaces is formed between two adjacent ribs.

2. The MBBR packing structure according to claim 1, characterized in that: The outer cylinder has a diameter of 25±0.5 mm and a height of 10±1 mm.

3. The MBBR packing structure according to claim 1, characterized in that: The effective specific surface area of ​​the MBBR filler structure is ≥820m 2 / m 3 .

4. The MBBR packing structure according to claim 1, characterized in that: The specific gravity of the MBBR filler structure is 0.94-0.

97.

5. The MBBR packing structure according to claim 1, characterized in that: The MBBR filler structure is integrally formed of HDPE material, and the inner surface of the MBBR filler structure is compounded with polypropylene or polyethylene non-woven fabric.

Images