CN108675438B - MNBR denitrification and dephosphorization biological filler - Google Patents
MNBR denitrification and dephosphorization biological filler Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C02F3/02—Aerobic processes
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/02—Aerobic processes
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- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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Abstract
The invention belongs to the technical field of a nitrogen and phosphorus removal biological filler for sewage treatment, in particular to an MNBR (MNBR) nitrogen and phosphorus removal biological filler, which solves the problems of filter material blockage, agglomeration, non-uniform water and gas distribution, local accumulation of distributed fillers, blockage of a water outlet grid and the like in the prior art, and the MNBR nitrogen and phosphorus removal biological filler is integrally of a cylindrical structure; the biological filler comprises: the inner ring layer, the middle ring layer, the outer ring layer and the filler matrix; the filler matrix comprises the following raw materials: polypropylene, polyvinyl chloride, polyvinyl alcohol, polyacrylamide and an antioxidant. The biological filler provided by the invention fully exerts the advantages of an attachment phase and a biological phase due to the special manufacturing process and structure, has the advantages of large specific surface area, good hydrophilicity and biological affinity, high biological activity, quick film formation, good treatment effect, strong impact resistance, long service life and the like, and is particularly suitable for high-concentration sewage difficult to degrade.
Description
Technical Field
The invention relates to the technical field of a nitrogen and phosphorus removal biological filler for sewage treatment, in particular to an MNBR (MNBR) nitrogen and phosphorus removal biological filler.
Background
In the biological wastewater treatment process, the treatment load and treatment effect are determined by the characteristics of the types of microorganisms, the biomass size, the microbial activity and the like, and the biological filler is a core part and plays a key role. The filler is a place where the biological membrane inhabits and inhabits, is a carrier of the biological membrane, influences the growth, propagation, shedding, form and spatial structure of microorganisms, has the function of intercepting suspended substances, and is also a main factor influencing the investment and running cost of sewage treatment engineering. The fillers currently applied to the biological treatment process mainly comprise: fixed fillers (inclined plates, inclined tubes and the like), suspended fillers (soft, semi-soft, combined, elastic three-dimensional and the like), dispersed fillers (suspended fillers, MBBR fillers, porous balls and the like) and novel modified fillers (nano-ceramsite, magnetic fillers and the like). In practical application, the problems of filter material blockage, agglomeration, uneven water and gas distribution, local accumulation of distributed fillers, blockage of a water outlet grid and the like are found, the effects of simultaneous denitrification and dephosphorization cannot be achieved, and the biological treatment effect is seriously influenced. Based on the statement, the invention provides an MNBR denitrification and dephosphorization biological filler.
Disclosure of Invention
The invention aims to solve the problems of filter material blockage, agglomeration, uneven water and gas distribution, local accumulation of distributed fillers, blockage of water outlet grids and the like in the prior art, and provides an MNBR (MNBR) nitrogen and phosphorus removal biological filler.
An MNBR denitrification dephosphorization biological filler, which is integrally in a cylindrical structure; the biological filler comprises: the inner ring layer, the middle ring layer, the outer ring layer and the filler matrix; the filler matrix comprises a membrane shell framework, a lacing wire and a central shaft; the outer ring layer is arranged on the periphery of the filler matrix, the central shaft vertically penetrates through the whole filler matrix, the lacing wires are supported between the central shaft and the middle ring layer, the inner ring layer is arranged in the middle of the membrane shell skeleton, the middle ring layer is arranged on the periphery of the inner ring layer, three-dimensional porous fibers are filled in the middle ring layer, the outer ring layer is formed by radially distributed filamentous fibers, the outer ring layer is provided with 8 groups of the filamentous fibers, and each group of the filamentous fibers are arranged according to an upper layer, a middle layer and a lower layer;
the filler matrix comprises the following raw materials in parts by weight: 40-50 parts of polypropylene, 25-40 parts of polyvinyl chloride, 10-18 parts of polyvinyl alcohol, 3-8 parts of polyacrylamide and 1-3 parts of antioxidant, wherein the antioxidant is a composition of a molecular sieve, 2, 6-di-tert-butyl-p-cresol and boron nitride in a mass ratio of 1:0.02-0.05: 0.3-0.8;
the preparation method of the filler matrix comprises the following steps:
s1, adding the molecular sieve, 2, 6-di-tert-butyl-p-cresol and boron nitride into a fine grinding machine together according to the mass ratio, and fully grinding for 0.3-0.5h to obtain the antioxidant;
s2, adding the polypropylene, polyvinyl chloride, polyvinyl alcohol, polyacrylamide and antioxidant with the specific gravity into a high-speed mixer together, and fully and uniformly mixing to obtain a mixture;
s3, adding the mixture into a double-screw extruder, and carrying out melt extrusion at the temperature of 180-220 ℃ to prepare a filler matrix with the porosity of 95.5-98.7% and the specific surface area of 200-300m2/m 3;
s4, soaking the filler matrix in an acidic potassium permanganate solution at 48-55 ℃ for 3-5h under the condition of continuous aeration by adopting a chemical oxidation-iron ion coverage modification method, then washing the filler matrix by using a hydrochloric acid solution and a phosphate buffer salt solution in sequence until the surface of the filler matrix is neutral, naturally airing, placing the filler matrix in a 0.13-0.2mol/L ferric trichloride solution for soaking for 1-2h, and finally heating and drying to dryness to obtain the iron-based composite filler.
Preferably, the biological filler is 100mm high and 240mm in diameter; the diameter of the inner ring layer is 20 mm; the thickness of the middle ring layer is 30mm, the three-dimensional porous fiber filled in the middle ring layer is made of PP, the porosity is 93-98%, the specific surface area is 200m2/m3, and the filling rate is 100%.
Preferably, the inner surface and the outer surface of the middle ring layer are arranged in a porous mode, the porosity is 50%, and the pore diameter is 5 mm; the upper and lower surfaces of the middle ring layer adopt a grid type.
Preferably, the three-dimensional porous fiber filled in the middle ring layer is a space three-dimensional columnar structure with ordered density formed by a plurality of thick fibers which are bent, staggered, wound and bonded with each other, the side surface of the filler matrix is bamboo-shaped, the cross section of the filler matrix is in a grid shape, holes in the middle of each grid form a channel, and the thick fibers for reinforcing are arranged between the cross points of each vertically corresponding grid.
Preferably, four tie bars are arranged and uniformly supported between the central shaft and the middle ring layer.
Preferably, a lantern ring convenient for mounting and hanging is arranged on the central shaft.
Preferably, the length of the filamentous fiber is 80mm, and the material is hydroformylation vinylon fiber.
The MNBR biological filler for nitrogen and phosphorus removal provided by the invention has the following beneficial effects:
1. the biological filler provided by the invention fully exerts the advantages of an attachment phase and a biological phase due to the special manufacturing process and structure, has the advantages of large specific surface area, good hydrophilicity and biological affinity, high biological activity, quick film formation, good treatment effect, strong impact resistance, long service life and the like, and is particularly suitable for high-concentration sewage difficult to degrade.
2. The biological filler provided by the invention is uniformly distributed in the bioreactor in a suspension mode, and the filling rate is 50%; besides the function of removing organic matters and reducing COD by using common fillers, the carrier can also play a role in removing nitrogen and phosphorus, each carrier is internally provided with different biological species, the outside is mainly aerobic bacteria, and the inside is mainly facultative bacteria, so that each carrier forms a micro-reactor, the outside is mainly nitrification reaction and phosphorus release reaction, and the inside is mainly denitrification reaction and phosphorus uptake reaction, thereby achieving the effect of removing nitrogen and phosphorus at the same time.
3. The filler matrix material provided by the invention adopts polypropylene and polyvinyl chloride as main raw materials, and water-based high polymer materials of polyvinyl alcohol and polyacrylamide are mixed in the manufacturing process, so that the hydrophilicity and bacterial affinity of the filler matrix are increased, the formation and adhesion of a biological film are accelerated, and the film hanging speed is increased; the antioxidant is prepared by compounding the molecular sieve, 2, 6-di-tert-butyl-p-cresol and boron nitride, the performances of ageing resistance, ultraviolet resistance and the like of the filler matrix are synergistically improved, the service life can reach more than 20 years, and the surface of the filler matrix is positively charged after the filler matrix is modified by a chemical oxidation-iron ion covering technology after being manufactured, so that the attachment of microorganisms with negative charges is facilitated.
Drawings
FIG. 1 is a top view of an MNBR denitrification and dephosphorization biological filler of the invention;
FIG. 2 is a cross-sectional view of an MNBR denitrification and dephosphorization biological filler of the invention;
in the figure: the inner ring layer 1, the middle ring layer 2, the outer ring layer 3, the membrane shell skeleton 4, the lacing wire 5, the central shaft 6 and the filamentous fiber 7.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example one
As shown in FIGS. 1-2, the invention provides an MNBR denitrification and dephosphorization biological filler, which is cylindrical as a whole; the biological filler comprises: an inner ring layer 1, a middle ring layer 2, an outer ring layer 3 and a filler matrix; the filler matrix comprises a membrane shell framework 4, a lacing wire 5 and a central shaft 6; the outer ring layer 3 is arranged at the periphery of the filler matrix; the central shaft 6 vertically penetrates through the whole filler matrix; the lacing wire 5 is supported between the central shaft 6 and the middle ring layer 2; the inner ring layer 1 is arranged in the middle of the membrane shell framework 4; the middle ring layer 2 is arranged at the periphery of the inner ring layer 1;
the middle ring layer 2 is filled with three-dimensional porous fiber; the outer ring layer 3 is provided with filamentous fibers 7 distributed radially; the outer ring layer 3 is provided with 8 groups of silk fibers 7; each group of filamentous fibers 7 is arranged according to an upper layer, a middle layer and a lower layer;
the filler matrix comprises the following raw materials in parts by weight: 40 parts of polypropylene, 25 parts of polyvinyl chloride, 10 parts of polyvinyl alcohol, 3 parts of polyacrylamide and 1 part of antioxidant, wherein the antioxidant is a composition of a molecular sieve, 2, 6-di-tert-butyl-p-cresol and boron nitride in a mass ratio of 1:0.02: 0.3;
the preparation method of the filler matrix comprises the following steps:
s1, adding the molecular sieve, 2, 6-di-tert-butyl-p-cresol and boron nitride into a fine grinding machine together according to the mass ratio, and fully grinding for 0.3 to obtain an antioxidant;
s2, adding the polypropylene, polyvinyl chloride, polyvinyl alcohol, polyacrylamide and antioxidant with the specific gravity into a high-speed mixer together, and fully and uniformly mixing to obtain a mixture;
s3, adding the mixture into a double-screw extruder, and carrying out melt extrusion at the temperature of 180 ℃ to prepare a filler matrix with the void ratio of 95.5% and the specific surface area of 200m2/m 3;
s4, soaking the filler matrix in an acidic potassium permanganate solution at 48 ℃ for 3h under the condition of continuous aeration by adopting a chemical oxidation-iron ion coverage modification method, then washing the filler matrix by using a hydrochloric acid solution and a phosphate buffer salt solution in sequence until the surface of the filler matrix is neutral, naturally airing, then soaking the filler matrix in a 0.13mol/L ferric trichloride solution for 1h, and finally heating and evaporating to dryness to obtain the iron-based composite filler.
Further, the biological filler is 100mm high and 240mm in diameter; the diameter of the inner ring layer 1 is 20 mm; the thickness of the middle ring layer 2 is 30 mm. The three-dimensional porous fiber filled in the middle ring layer 2 is made of PP, the void ratio is 93-98%, the specific surface area is 200m2/m3, and the filling rate is 100%.
Furthermore, the three-dimensional porous fiber filled in the middle ring layer 2 is a space three-dimensional columnar structure with ordered density formed by a plurality of thick fibers which are bent, staggered and wound and are mutually bonded, the side surface of the filler is bamboo-shaped, the cross section of the filler is in a grid shape, holes in the middle of each grid form a channel, and the thick fibers which play a role in reinforcement are arranged between the cross points of each vertically corresponding grid.
Further, the length of the filamentous fibers 7 of the outer ring layer 3 is 80mm, and the material is the hydroformylation vinylon fibers. The filamentous fibers 7 can freely swing in water along with water flow, and can play a role in cutting and blocking bubbles while reducing organic matters after film formation, so that the retention time of the bubbles in the water body and the gas-liquid contact surface area are increased, and the mass transfer efficiency is improved.
Furthermore, the inner surface and the outer surface of the middle ring layer 2 are arranged in a porous way, the porosity is 50 percent, and the pore diameter is 5 mm; the transmission of media such as water, gas and the like can be realized between the inside and the outside of the filler; the upper surface and the lower surface of the middle ring layer 2 adopt a grid type which can realize the transmission of media such as water, gas and the like, and can facilitate the sedimentation of sludge after the biomembrane falls off.
Furthermore, four tie bars 5 are arranged, and the four tie bars 5 are uniformly supported between the central shaft 6 and the middle ring layer 2.
The specific surface area of a single biological filler is about 1200m2/m3, the biological filler is uniformly distributed in the bioreactor in a suspension mode, the filling rate is 50%, the specific surface area after installation is about 600m2/m3, the effective specific surface area is large, and the biofilm amount in unit volume is large.
Example two
The structure of the biological filler is the same as that of the embodiment I
The filler matrix comprises the following raw materials in parts by weight: 45 parts of polypropylene, 32 parts of polyvinyl chloride, 14 parts of polyvinyl alcohol, 5 parts of polyacrylamide and 2 parts of antioxidant, wherein the antioxidant is a composition of a molecular sieve, 2, 6-di-tert-butyl-p-cresol and boron nitride in a mass ratio of 1:0.03: 0.6;
the preparation method of the filler matrix comprises the following steps:
s1, adding the molecular sieve, 2, 6-di-tert-butyl-p-cresol and boron nitride into a fine grinding machine together according to the mass ratio, and fully grinding for 0.4h to obtain the antioxidant;
s2, adding the polypropylene, polyvinyl chloride, polyvinyl alcohol, polyacrylamide and antioxidant with the specific gravity into a high-speed mixer together, and fully and uniformly mixing to obtain a mixture;
s3, adding the mixture into a double-screw extruder, and carrying out melt extrusion at the temperature of 200 ℃ to prepare a filler matrix with the void ratio of 97 percent and the specific surface area of 250m2/m 3;
s4, soaking the filler matrix in an acidic potassium permanganate solution at 52 ℃ for 4 hours under the condition of continuous aeration by adopting a chemical oxidation-iron ion coverage modification method, then washing the filler matrix by using a hydrochloric acid solution and a phosphate buffer salt solution in sequence until the surface of the filler matrix is neutral, naturally airing, placing the filler matrix in a 0.16mol/L ferric trichloride solution, soaking for 1.5 hours, and finally heating and evaporating to dryness to obtain the iron-based composite filler.
EXAMPLE III
The structure of the biological filler is the same as that of the embodiment I
The filler matrix comprises the following raw materials in parts by weight: 50 parts of polypropylene, 40 parts of polyvinyl chloride, 18 parts of polyvinyl alcohol, 8 parts of polyacrylamide and 3 parts of antioxidant, wherein the antioxidant is a composition of a molecular sieve, 2, 6-di-tert-butyl-p-cresol and boron nitride in a mass ratio of 1:0.05: 0.8;
the preparation method of the filler matrix comprises the following steps:
s1, adding the molecular sieve, 2, 6-di-tert-butyl-p-cresol and boron nitride into a fine grinding machine together according to the mass ratio, and fully grinding for 0.5h to obtain the antioxidant;
s2, adding the polypropylene, polyvinyl chloride, polyvinyl alcohol, polyacrylamide and antioxidant with the specific gravity into a high-speed mixer together, and fully and uniformly mixing to obtain a mixture;
s3, adding the mixture into a double-screw extruder, and carrying out melt extrusion at the temperature of 220 ℃ to prepare a filler matrix with the void ratio of 98.7% and the specific surface area of 300m2/m 3;
s4, soaking the filler matrix in an acidic potassium permanganate solution at 55 ℃ for 5 hours under the condition of continuous aeration by adopting a chemical oxidation-iron ion coverage modification method, then washing the filler matrix by using a hydrochloric acid solution and a phosphate buffer salt solution in sequence until the surface of the filler matrix is neutral, naturally airing, then soaking the filler matrix in a 0.2mol/L ferric trichloride solution for 2 hours, and finally heating and drying to dryness to obtain the iron-based composite filler.
The MNBR biological filler for nitrogen and phosphorus removal prepared in the first step and the third step of the invention is used for treating sewage of a certain urban sewage plant, and the indexes of the quality of the treated sewage are as follows: COD is 420mg/L, BOD5 is 250mg/L, SS is 530mg/L, TN is 55mg/L, NH3-N is 60mg/L, TP is 5.5mg/L, PH value is 3, sewage treatment scale is 5 ten thousand tons/day, and operation treatment results are as follows:
table 1:
as can be seen from Table 1: the MNBR biological filler provided by the invention has good nitrogen and phosphorus removal effects, the treatment effect of the second embodiment is optimal, and the treated effluent reaches the first-class A standard in GB 18918-2002.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. An MNBR denitrification dephosphorization biological filler, which is integrally in a cylindrical structure; characterized in that the biological filler comprises: the inner ring layer (1), the middle ring layer (2), the outer ring layer (3) and the filler matrix; the filler matrix comprises a membrane shell framework (4), a lacing wire (5) and a central shaft (6); the outer ring layer (3) is arranged on the periphery of the filler matrix, the central shaft (6) penetrates through the whole filler matrix up and down, the lacing wire (5) is supported between the central shaft (6) and the middle ring layer (2), the inner ring layer (1) is arranged in the middle of the membrane shell framework (4), the middle ring layer (2) is arranged on the periphery of the inner ring layer (1), the middle ring layer (2) is filled with three-dimensional porous fibers, the outer ring layer (3) is provided with filamentous fibers (7) distributed in a radial manner, the outer ring layer (3) is provided with 8 groups of filamentous fibers (7), and each group of filamentous fibers (7) is arranged according to three layers, namely an upper layer, a middle layer and a lower layer;
the filler matrix comprises the following raw materials in parts by weight: 40-50 parts of polypropylene, 25-40 parts of polyvinyl chloride, 10-18 parts of polyvinyl alcohol, 3-8 parts of polyacrylamide and 1-3 parts of antioxidant, wherein the antioxidant is a composition of a molecular sieve, 2, 6-di-tert-butyl-p-cresol and boron nitride in a mass ratio of 1:0.02-0.05: 0.3-0.8;
the preparation method of the filler matrix comprises the following steps:
s1, adding the molecular sieve, 2, 6-di-tert-butyl-p-cresol and boron nitride into a fine grinding machine together according to the mass ratio, and fully grinding for 0.3-0.5h to obtain the antioxidant;
s2, adding the polypropylene, polyvinyl chloride, polyvinyl alcohol, polyacrylamide and antioxidant with the specific gravity into a high-speed mixer together, and fully and uniformly mixing to obtain a mixture;
s3, adding the mixture into a double-screw extruder, and carrying out melt extrusion at the temperature of 180-220 ℃ to prepare a filler matrix with the porosity of 95.5-98.7% and the specific surface area of 200-300m2/m 3;
s4, soaking the filler matrix in an acidic potassium permanganate solution at 48-55 ℃ for 3-5h under the condition of continuous aeration by adopting a chemical oxidation-iron ion coverage modification method, then washing the filler matrix by using a hydrochloric acid solution and a phosphate buffer salt solution in sequence until the surface of the filler matrix is neutral, naturally airing, placing the filler matrix in a 0.13-0.2mol/L ferric trichloride solution for soaking for 1-2h, and finally heating and drying to dryness to obtain the iron-based composite filler.
2. The MNBR biological filler for nitrogen and phosphorus removal according to claim 1, wherein said biological filler is 100mm high and 240mm in diameter; the diameter of the inner ring layer (1) is 20 mm; the thickness of the middle ring layer (2) is 30mm, the three-dimensional porous fiber filled in the middle ring layer (2) is made of PP, the void ratio is 93-98%, the specific surface area is 200m2/m3, and the filling rate is 100%.
3. The MNBR biological filler for nitrogen and phosphorus removal according to claim 1, wherein the inner surface and the outer surface of the intermediate ring layer (2) are arranged in a porous way, the porosity is 50%, and the pore diameter is 5 mm; the upper surface and the lower surface of the middle ring layer (2) adopt a grid type.
4. The MNBR biological filler for nitrogen and phosphorus removal according to claim 1, wherein the three-dimensional porous fibers filled in the middle ring layer (2) are in a density-ordered spatial three-dimensional columnar structure formed by a plurality of crude fibers which are bent, interlaced and wound and bonded with each other, the side surface of the filler matrix is bamboo-shaped, the cross section of the filler matrix is in a grid shape, the middle holes of each grid form channels, and the crude fibers for reinforcement are arranged between the cross points of each vertically corresponding grid.
5. The MNBR biological filler for nitrogen and phosphorus removal according to claim 1, characterized in that said tie bars (5) are provided in four numbers and are uniformly supported between the central shaft (6) and the intermediate ring layer (2).
6. The MNBR biological filter for nitrogen and phosphorus removal according to claim 1, characterized in that said central shaft (6) is provided with a lantern ring for easy installation and suspension.
7. The MNBR biological filler for nitrogen and phosphorus removal according to claim 1, wherein said filamentous fiber (7) has a length of 80mm and is made of a hydroformylated vinylon fiber.
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| CN109205953A (en) * | 2018-10-30 | 2019-01-15 | 四川省环境保护科学研究院 | A kind of courtyard-style domestic sewage processing system and processing method |
| CN110563127B (en) * | 2019-08-26 | 2021-02-19 | 天津市环境保护技术开发中心设计所 | Preparation method of modified polyurethane sponge filler for MBBR (moving bed biofilm reactor) process emergency |
| CN113121008A (en) * | 2019-12-30 | 2021-07-16 | 吉林建筑大学 | Tubular brush type biological filler |
| CN114181429B (en) * | 2021-12-16 | 2023-05-12 | 浙江工业大学 | Modified polyurethane sponge filler, and preparation method and application thereof |
| CN115504568B (en) * | 2022-09-21 | 2023-10-13 | 丁光俊 | Biochemical tank using magnetic core suspended filler and sewage treatment system thereof |
| CN115925101A (en) * | 2022-11-20 | 2023-04-07 | 沃顿科技股份有限公司 | Efficient anti-pollution MBR (membrane bioreactor) membrane assembly |
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| CN2054457U (en) * | 1989-04-28 | 1990-03-14 | 江都县净水器材厂 | Multipurpose compound living things filler |
| JP2000246272A (en) * | 1999-02-25 | 2000-09-12 | Kansai Kankyo Kaihatsu Kk | Method for removing nitrogen of sewage |
| CN202625912U (en) * | 2012-04-12 | 2012-12-26 | 廊坊恒盛环保设备有限公司 | Carbon fiber biological filler combined structure |
| CN106396087A (en) * | 2016-06-07 | 2017-02-15 | 四川悦承环保节能科技有限公司 | Modified flowable biological filling material, and preparation method and application thereof |
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