CN113461155A - Membrane bioreactor and application thereof in sewage treatment - Google Patents
Membrane bioreactor and application thereof in sewage treatment Download PDFInfo
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- CN113461155A CN113461155A CN202010237989.3A CN202010237989A CN113461155A CN 113461155 A CN113461155 A CN 113461155A CN 202010237989 A CN202010237989 A CN 202010237989A CN 113461155 A CN113461155 A CN 113461155A
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- membrane bioreactor
- shell
- spiral structure
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- C—CHEMISTRY; METALLURGY
- 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
- C02F3/30—Aerobic and anaerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Abstract
The invention discloses a membrane bioreactor and application thereof in sewage treatment, wherein the membrane bioreactor comprises a shell with an opening at the top and a membrane hanging structure arranged in a flow cavity, wherein a flow cavity is formed inside the shell, and the membrane hanging structure comprises: the bottom of the shell is provided with a water inlet communicated with the flow cavity, and the top of the shell is provided with a water outlet communicated with the flow cavity; the film hanging structure comprises an elastic spiral structure vertically arranged in the flow cavity and a flexible carrier spirally wound along the length direction of the elastic spiral structure, the bottom of the elastic spiral structure is fixed at the bottom in the shell, and the top of the elastic spiral structure is fixed at the top of the shell through a fixing rope. The invention fully utilizes the elastic spiral structure to generate certain disturbance to the water flow in the downward-in-upward-out direction, increases the contact time of pollutants in water and the flexible carrier, and promotes the improvement of the amount of the microorganism biofilm formation on the flexible carrier.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a membrane bioreactor based on a flexible carrier and application thereof in sewage treatment.
Background
In recent years, the development of sewage and wastewater treatment equipment systems mainly turns from large-scale centralized type to medium-small decentralized type, and is more suitable for the water treatment requirements of China. As a novel and efficient sewage treatment device, the membrane bioreactor is widely applied to treatment of chemical wastewater, printing and dyeing and the like and municipal domestic sewage. The method combines the technical characteristics of the traditional activated sludge method and the biological method, has better water treatment effect and ensures more stable water quality. In the membrane bioreactor, the membrane hanging effect of the equipment is a direct factor which directly influences the water quality treatment effect of the reactor. The larger the biofilm formation amount is, the better the treatment effect is; otherwise, the lower.
The flexible carrier is one of the fillers widely applied in sewage treatment, and the microbial biofilm formation amount of the membrane bioreactor can be effectively improved by selecting a proper flexible carrier and applying the flexible carrier to the design of the membrane bioreactor. For the design of the membrane bioreactor, most of the membrane bioreactors select different types (such as spherical, ceramsite and the like) of fillers or select other linear (such as thin rope-shaped, spiral, band-type, ecological base and the like flexible carriers) to be directly and vertically suspended in the reactor. Thereby improving the water quality treatment effect. The main purpose is to improve the amount of the microorganism biofilm formation. However, these techniques have the limitations of large floor space, insufficient film-forming effect, and the like.
Disclosure of Invention
The invention aims to provide a membrane bioreactor based on flexible carriers, aiming at the problem of low scraping quantity of the flexible carriers in the prior art.
In another aspect of the invention, there is provided the use of the membrane bioreactor for treating wastewater.
The technical scheme adopted for realizing the purpose of the invention is as follows:
the utility model provides a membrane bioreactor, includes inside formation flow cavity and the open shell in top and set up in the membrane hanging structure in the flow cavity, wherein:
the bottom of the shell is provided with a water inlet communicated with the flowing cavity, and the top of the shell is provided with a water outlet communicated with the flowing cavity;
the film hanging structure comprises an elastic spiral structure and a flexible carrier, the elastic spiral structure is vertically arranged in the flowing cavity, the flexible carrier is spirally wound along the length direction of the elastic spiral structure, the bottom of the elastic spiral structure is fixed at the bottom in the shell, and the top of the elastic spiral structure is fixed at the top of the shell through a fixing rope.
In order to facilitate the positioning of the bottom of the elastic spiral structure, a positioning clamp is fixed at the bottom in the shell, and the bottom of the elastic spiral structure is clamped by the positioning clamp. Further, the positioning clip is adhered to the outer shell inner bottom through glass cement.
In order to facilitate the positioning of the top of the elastic spiral structure, a bracket is fixed on the top of the shell, and the top of the fixed rope is fixed on the bracket.
In order to prevent the elastic spiral structure from being broken by excessive tensile force applied to the elastic spiral structure when the elastic spiral structure is fixed, the top part and the top part of the elastic spiral structure are fixed together through a connecting rope. Further connecting ropes can be nylon ropes.
In order to optimize the biofilm formation amount of microorganisms, the ratio of the ring diameter of the spiral monomer of the elastic spiral structure to the outer diameter of the shell is (8-10): (20-30), the ratio of the vertical distance between two adjacent spiral single bodies above and below to the ring diameter of the spiral single body is (7.5-10): (8-10).
In order to optimize the treatment effect of the reactor, the filling rate of the flexible carrier is 40-60%, more preferably 50%. And taking the elastic spiral structure as a cylinder, and calculating the ratio of the volume of the cylinder to the volume of the flow cavity to obtain the filling rate of the flexible carrier.
Preferably, the water inlet is arranged at the bottommost part of the side wall of the shell, and the distance between the water outlet and the bottom of the shell is 80-90% of the height of the shell.
On the other hand, the invention also comprises the application of the membrane bioreactor in sewage treatment, sewage is introduced from the water inlet, passes through the flowing cavity, is discharged from the water outlet, and circulates in sequence, and microorganisms for treating sewage are added simultaneously when the sewage is introduced.
In the technical scheme, the membrane bioreactor has the removal rate of 44.02-51.70% for ammonia nitrogen in sewage, 45.89-26.65% for total nitrogen in sewage, 28.95-40.04% for total phosphorus in sewage and COD in sewageCrThe removal rate of (A) is 71.56-83.03%.
In the technical scheme, the adsorption capacity of the lipid phosphorus of the flexible carrier in the membrane bioreactor is 77-185 nmolP/g.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, through technical improvement, the flexible carrier is wound on the fixedly arranged elastic spiral structure, the biofilm formation effect of the flexible carrier is improved, and the flexible carrier is combined with the water treatment technology, process and method theory, so that the flexible carrier has important significance for accelerating the popularization and application of the sewage treatment technology in China and improving the content of the water treatment technology.
2. The invention makes full use of the elastic spiral structure in the membrane bioreactor, and the structure generates certain disturbance to the water flow in the downward-in-upward-out direction, thereby increasing the contact time of the pollutants in the water and the flexible carrier, promoting the improvement of the amount of the microorganisms on the flexible carrier to form a membrane, and facilitating the removal of the pollutants in the water by the biological membrane.
3. The biological film on the flexible carrier can degrade organic pollutants in sewage, and aerobic and anaerobic layers of the biological film are formed on the carrier, so that nitrogen and phosphorus removal can be effectively carried out on the sewage.
Drawings
FIG. 1 is a schematic diagram of the membrane bioreactor of example 1.
FIG. 2 is a schematic diagram of the membrane bioreactor of comparative example 1.
In the figure:
1-support, 2-fixed rope, 3-delivery port, 4-surface of water, 5-flexible carrier, 6-elastic spiral structure, 7-connecting rope, 8-shell, 9-positioning clamp, 10-water inlet, d 1-diameter of elastic spiral structure, d 2-distance between two adjacent spiral monomer structures.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The flexible carrier in the following examples was purchased from environmental protection technologies, Inc. of King Pace, Jiangsu
Example 1
A membrane bioreactor, includes the inside shell 8 that forms the flow cavity and set up in the biofilm formation structure in the flow cavity, wherein:
the bottom of the shell is provided with a water inlet 10 communicated with the flow cavity, and the top of the shell is provided with a water outlet 3 communicated with the flow cavity;
the film hanging structure comprises an elastic spiral structure 6 vertically arranged in the flow cavity and a flexible carrier 5 spirally wound along the length direction of the elastic spiral structure, the bottom of the elastic spiral structure is fixed at the bottom in the shell, and the top of the elastic spiral structure is fixed at the top of the shell through a fixing rope.
The shell is a cylindrical organic glass structure with a flow cavity formed inside, the diameter of the shell is 250mm (including the wall thickness), the wall thickness is 5mm, the height is 700mm, and the diameter of the flexible carrier is
The elastic fiber yarn adopts hard plastics, the diameter d1 of the elastic spiral structure is 100mm, and the distance d2 between two adjacent spiral monomer structures is 75-100 mm. The length of the flexible carrier is 1200mm and the filling rate of the flexible carrier is 50%.
The diameter of water inlet and delivery port is 10mm, and water inlet and delivery port are seted up respectively the left side and the right side of shell, and the water inlet is seted up at the position that is 600mm high apart from the shell bottom.
In order to facilitate the positioning of the elastic spiral structure, a positioning clamp 9 is fixed at the bottom in the shell, and the bottom of the elastic spiral structure is clamped by the positioning clamp. Further, the positioning clip is adhered to the outer shell inner bottom through glass cement. The top of the shell is fixed with a support 1, and the top of the elastic spiral structure is fixed on the support 1 through the top of a fixing rope 2. The top and bottom of the elastic spiral structure are connected together by a connecting rope 7.
Comparative example 1
A membrane bioreactor comprising a housing 8 forming a flow chamber therein and a flexible carrier 5 disposed within the flow chamber, wherein:
the bottom of the shell is provided with a water inlet 10 communicated with the flow cavity, and the top of the shell is provided with a water outlet 3 communicated with the flow cavity;
the bottom of the flexible carrier 5 is fixed at the bottom in the shell, and the top of the flexible carrier 5 is fixed at the top of the shell through a fixing rope.
The shell is a cylindrical organic glass structure with a flow cavity formed inside, the diameter of the shell is 250mm (including the wall thickness), the wall thickness is 5mm, the height is 700mm, and the diameter of the flexible carrier is
The elastic fiber yarn is prepared by taking two sections of flexible carriers with the same length of 600mm, and the filling rate of the flexible carriers is 50 percent.
The diameter of water inlet and delivery port is 10mm, and water inlet and delivery port are seted up respectively the left side and the right side of shell, and the water inlet is seted up at the position that is 600mm high apart from the shell bottom.
Example 2
In this example, the membrane bioreactor (denoted as spiral membrane reactor) of example 1 and the membrane bioreactor (denoted as conventional membrane bioreactor) of comparative example 1 were used to treat wastewater.
After the sewage enters the reactor, the flexible carrier is completely immersed in the water, a biological film is formed on the carrier, and the biological film adsorbs, absorbs and degrades pollutants in the sewage, so that the effect of purifying the water quality is achieved. The concrete description is as follows:
the membrane bioreactor is subjected to experimental study for simulating sewage purification with different pollution degrees (low concentration and high concentration). Respectively preparing low-concentration sewage and high-concentration sewage, adding the sewage into a reactor, inoculating lake water of the Qinghai lake of Tianjin university in the sewage which is introduced in the first day, wherein the volume ratio of the lake water to the simulated sewage is 1: 9, then in the subsequent experiment, the sewage as shown in the table 1 is continuously introduced, and the water quality preparation components are shown in the table 1.
TABLE 1 two concentrations Water composition and concentration (mg/L)
In the embodiment, six membrane bioreactors are used for carrying out parallel experiments, each experiment is firstly carried out by introducing low-concentration sewage, the operation is continued for 7-10 days (about one month in total) after the effluent tends to be stable, the low-concentration experiment is finished, and then the parallel experiments are carried out by passing high-concentration sewage to each membrane bioreactor. Six experiments were performed using the same barrel of wastewater.
The effluent (ammonia nitrogen, total phosphorus and COD) of the two membrane bioreactors is treated under two pollution levels of low concentration and high concentrationCr) And lipophos (biomass) were monitored and the effect of the reactor on contaminant removal was analyzed. And when the water quality at the water outlet is stable, measuring the content of the lipid phosphorus in the flexible carrier in the reactor for evaluating and analyzing the biofilm formation effect.
Through the simulated purification experiments of the low-concentration and high-concentration pollution degrees, the results of the removal efficiency of the two reactors to pollutants are shown in table 2. Table 2 shows the average results of six experiments, and the results show that ammonia nitrogen, total phosphorus and COD are measured at low concentration stageCrThe removal rate of the spiral membrane bioreactor is respectively higher than that of the conventional membrane bioreactor: 6.80%, 7.42%, 6.51% and 8.92%; the concentration in the high concentration stage is respectively 10.04%, 7.03%, 6.61% and 9.51%.
In the experiments of the low-concentration stage and the high-concentration stage, the removal rate of the pollutants in the water body is obviously higher than that of the conventional membrane bioreactor. The spiral membrane bioreactor is superior to the conventional membrane bioreactor in the water quality purifying effect.
TABLE 2 removal rate (%)
RSpiral shape-RGeneral of: the removal rate of the corresponding index of the spiral membrane bioreactor group-the removal rate of the corresponding index of the conventional membrane bioreactor group.
The lipophos in both reactors was measured at both low and high levels of contamination (see table 3). Table 3 is an average of six experimental results showing the following in terms of the lipid phosphorus content per mass of flexible vehicle:
the same concentration stage condition, no matter in the low concentration stage or the high concentration stage, the content of the phosphorus in the spiral membrane bioreactor is obviously higher than that of the conventional membrane bioreactor. Under the low concentration stage and the high concentration stage, the content of the lipid phosphorus in the spiral membrane bioreactor is respectively 61.59 percent higher and 64.76 percent higher than that in the conventional membrane bioreactor.
Under the condition of different concentrations of the same reactor, the concentration of water pollutants is increased, the biofilm formation amount is also obviously increased, and the spiral membrane bioreactor has larger increase range. Compared with the low concentration, the content of the lipophosphorus in the conventional membrane bioreactor and the content of the lipophosphorus in the spiral membrane bioreactor are respectively increased by 127.60 percent and 132.07 percent.
The biofilm formation effect of microorganisms is the core key point of directly influencing the device to the water body pollutant and getting rid of, and under the same condition, the greater the biofilm formation amount is, the higher the clearance to corresponding index is.
The analysis result of the content of the lipo-phosphorus also shows that the spiral membrane bioreactor has better membrane hanging effect and better water quality purification effect than the conventional membrane bioreactor.
TABLE 3 determination of lipophos (biomass) in Water of various concentrations
Note: 1nmol of P corresponds approximately to the size of cells 10 of E.coli (E.coli)8And (4) respectively.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a membrane bioreactor which characterized in that, including inside formation flow cavity and the open shell in top with set up in the interior hanging membrane structure of flow cavity, wherein:
the bottom of the shell is provided with a water inlet communicated with the flowing cavity, and the top of the shell is provided with a water outlet communicated with the flowing cavity;
the film hanging structure comprises an elastic spiral structure and a flexible carrier, the elastic spiral structure is vertically arranged in the flowing cavity, the flexible carrier is spirally wound along the length direction of the elastic spiral structure, the bottom of the elastic spiral structure is fixed at the bottom in the shell, and the top of the elastic spiral structure is fixed at the top of the shell through a fixing rope.
2. The membrane bioreactor of claim 1, wherein a retaining clip is secured to the bottom of the housing and the bottom of the resilient helical structure is retained by the retaining clip.
3. The membrane bioreactor of claim 1, wherein a bracket is fixed to the top of said housing, and the top of said retaining cord is fixed to said bracket.
4. The membrane bioreactor of claim 1, wherein the top and the top of the elastic helical structure are secured together by a connecting string.
5. A membrane bioreactor according to claim 1, wherein the ratio of the ring diameter of the helical elements of the elastic helical structure to the outer diameter of the housing is (8-10): (20-30), the ratio of the vertical distance between two adjacent spiral single bodies above and below to the ring diameter of the spiral single body is (7.5-10): (8-10).
6. A membrane bioreactor according to claim 1, wherein the flexible carrier has a filling rate of 40-60%, more preferably 50%.
7. The membrane bioreactor of claim 1, wherein said water inlet is disposed at the bottom most portion of the side wall of said housing and the distance between said water outlet and the bottom of said housing is 80-90% of the height of the housing.
8. Use of a membrane bioreactor according to claim 1 for the treatment of wastewater, wherein wastewater is introduced from the water inlet, passed through the flow chamber and discharged from the water outlet, and microorganisms for treating wastewater are added at the same time during the earlier stage of introduction of wastewater.
9. The use of claim 8, wherein the membrane bioreactor has a removal rate of ammonia nitrogen in the wastewater of 44.02-51.70%, a removal rate of total nitrogen in the wastewater of 45.89-26.65%, a removal rate of total phosphorus in the wastewater of 28.95-40.04%, and a removal rate of COD in the wastewater of 28.95-40.04%CrThe removal rate of (A) is 71.56-83.03%.
10. The use of claim 8, wherein the flexible support in the membrane bioreactor has a lipid phosphorus adsorption capacity of 77 to 185 nmolP/g.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001276865A (en) * | 2000-01-28 | 2001-10-09 | Hitachi Chem Co Ltd | Spiral microorganism carrier |
| JP2004243207A (en) * | 2003-02-13 | 2004-09-02 | Asahi Eng Co Ltd | Wastewater treatment apparatus, wastewater treatment method and microorganism carrier |
| CN101274800A (en) * | 2007-03-27 | 2008-10-01 | 旭化成化学株式会社 | Film separated activated sludge apparatus |
| CN201258281Y (en) * | 2008-08-02 | 2009-06-17 | 中国石油化工股份有限公司 | Spiral bioreactor |
| US20110163028A1 (en) * | 2008-04-28 | 2011-07-07 | Seok Hwan Hwang | Biofilm Reactor Containing Spiral Structure and Water Treatment Device Using the Same |
| US20190375661A1 (en) * | 2019-01-29 | 2019-12-12 | Jiangnan University | Helical Bed Biofilm Reactor for Wastewater Treatment |
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2020
- 2020-03-30 CN CN202010237989.3A patent/CN113461155A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001276865A (en) * | 2000-01-28 | 2001-10-09 | Hitachi Chem Co Ltd | Spiral microorganism carrier |
| JP2004243207A (en) * | 2003-02-13 | 2004-09-02 | Asahi Eng Co Ltd | Wastewater treatment apparatus, wastewater treatment method and microorganism carrier |
| CN101274800A (en) * | 2007-03-27 | 2008-10-01 | 旭化成化学株式会社 | Film separated activated sludge apparatus |
| US20110163028A1 (en) * | 2008-04-28 | 2011-07-07 | Seok Hwan Hwang | Biofilm Reactor Containing Spiral Structure and Water Treatment Device Using the Same |
| CN201258281Y (en) * | 2008-08-02 | 2009-06-17 | 中国石油化工股份有限公司 | Spiral bioreactor |
| US20190375661A1 (en) * | 2019-01-29 | 2019-12-12 | Jiangnan University | Helical Bed Biofilm Reactor for Wastewater Treatment |
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Application publication date: 20211001 |