CN112645448A - Variable volume type operation method applied to process for recovering phosphorus by biomembrane method - Google Patents

Variable volume type operation method applied to process for recovering phosphorus by biomembrane method Download PDF

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CN112645448A
CN112645448A CN202011377514.0A CN202011377514A CN112645448A CN 112645448 A CN112645448 A CN 112645448A CN 202011377514 A CN202011377514 A CN 202011377514A CN 112645448 A CN112645448 A CN 112645448A
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phosphorus
concentration
volume
biofilm
recovering
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CN112645448B (en
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潘杨
陈越
黄勇
毕贞
倪敏
张星宇
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Suzhou University of Science and Technology
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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
    • 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
    • C02F3/006—Regulation methods for biological treatment
    • 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
    • C02F3/02—Aerobic processes
    • 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
    • C02F3/28—Anaerobic digestion processes
    • 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
    • C02F3/301—Aerobic and anaerobic treatment in the same reactor
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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Abstract

The invention provides a variable volume type operation method applied to a process for recovering phosphorus by a biomembrane method, which is used for pre-calculating the volume V of a base liquid required to be pre-stored in a phosphorus recovery device when the concentration of the recoverable phosphorus is pre-calculated1And the amount of carbon source (volume V of carbon source) added each time2Carbon source concentration C in carbon source storage tank2) Then operating the biofilm reactor under the alternate aerobic and anaerobic conditions, continuously increasing the phosphorus concentration of the phosphorus-containing solution for recovery after n times of circulation, stopping the circulation when the phosphorus concentration reaches the recoverable phosphorus concentration, and at the moment, V1，V2And V0Satisfy the relationship between V1+nV2≤V0. The processThe variable volume type operation method solves the problems that the concentration of the phosphorus recovery liquid is greatly diluted and the volume of the phosphorus recovery liquid in the phosphorus recovery tank is difficult to control due to an external carbon source in the process of recovering phosphorus by a biomembrane method, and simultaneously improves the concentration of the phosphorus solution in the phosphorus recovery tank most efficiently, thereby greatly shortening the process time and improving the process efficiency.

Description

Variable volume type operation method applied to process for recovering phosphorus by biomembrane method
Technical Field
The invention relates to the technical field of water treatment, in particular to a variable volume type operation method applied to a process for recovering phosphorus by a biomembrane method.
Background
Since phosphorus is a non-renewable resource, recovery of phosphorus from municipal sewage is economically and environmentally dual beneficial.
The adoption of the biological membrane can realize synchronous removal and high-efficiency enrichment of phosphorus in municipal sewage in a mainstream process. The phosphorus accumulating bacteria in the biomembrane play a similar role of sponge water absorption, and absorb and accumulate phosphorus in the wastewater under aerobic conditions, so that the wastewater is discharged after reaching the standard; phosphorus-accumulating bacteria that accumulate phosphorus under anaerobic conditions release phosphorus into a specified phosphorus recovery solution, and the phosphorus recovery solution is repeatedly recycled to obtain a recovery solution with a phosphorus concentration of up to tens of times in the influent water. Then, the phosphorus concentrated solution is recovered by a method such as chemical crystallization. The phosphate obtained by the method has low impurity content, high recovery efficiency and simple process.
After the phosphorus accumulating bacteria in the biological membrane aerobically accumulate phosphorus, a carbon source is added under the anaerobic condition to stimulate the biological membrane to release the phosphorus in the recovery liquid. In the existing process, the volume of the phosphorus recovery tank is not limited, and in order to meet the process requirements, a phosphorus recovery tank with a larger volume is generally arranged in advance. The external carbon source generally adopts a liquid adding mode, a certain amount of high-concentration carbon source (such as methanol, acetic acid and the like) is needed in each anaerobic release process, the carbon source continuously added in the anaerobic stage can cause phosphorus recovery and dilution, the concentration of phosphorus recovery liquid can not reach high concentration in a short time, the increase of the process cycle number is caused, and therefore more process time is needed to be consumed; and if the reactor is large in volume, the carbon source adding volume is large, and the requirement on the volume of the phosphorus recovery tank is increased due to the circularly added carbon source, so that the problem that the volume of the phosphorus recovery tank is difficult to control is caused, and unnecessary cost waste is also caused.
In view of the above, there is a need to improve the prior art process for recovering phosphorus by a biofilm method to solve the above problems.
Disclosure of Invention
The invention aims to disclose a variable volume type operation method applied to a process for recovering phosphorus by a biofilm method, and solves the problems that the addition of a carbon source is difficult to control the phosphorus recovery dilution and the volume of a phosphorus recovery tank.
In order to achieve the purpose, the invention provides a variable volume type operation method applied to a process for recovering phosphorus by a biofilm method, which comprises the following steps:
1) according to the effective volume V of the biofilm reactor0Phosphorus concentration of phosphorus-containing wastewater, phosphorus concentration of a pre-recovered phosphorus recovery solution, enrichment times and pre-added carbon source amount, and calculating and setting volume V of a base solution to be prestored in a phosphorus recovery device1And volume V of carbon source dosed once2；
2) Prestoring the volume of V in the phosphorus recovery device1The base liquid of (3);
3) under aerobic condition, the phosphorus-containing wastewater enters a biomembrane reactor, and is discharged after aerobic absorption of phosphorus;
4) under the anaerobic condition, adding the solution in the phosphorus recovery device into the biofilm reactor, and adding the solution with the volume of V2After anaerobic phosphorus release by the biomembrane, recovering the phosphorus-containing solution in the biomembrane reactor to a phosphorus recovery device;
5) the step 3) and the step 4) are circulated for n times, and the volume V is obtained in a phosphorus recovery device1+nV2When the concentration of the phosphorus-containing solution reaches a recoverable phosphorus concentration, the cycle is stopped, and at this time, V1，V2And V0Satisfy the relationship between V1+nV2≤V0，
Wherein n is an integer.
As a further improvement of the invention, the base liquid in the step 2) is water with the phosphorus concentration of 0.
As a further improvement of the invention, in each circulation process, the volumes of the phosphorus-containing wastewater entering the biomembrane reactor are V under aerobic conditions0。
As a further improvement of the invention, in the step 5), the recoverable phosphorus concentration of the phosphorus-containing solution is more than or equal to 50 mg/L.
As a further improvement of the invention, in the step 5), the recoverable phosphorus concentration of the phosphorus-containing solution is 50 mg/L-300 mg/L.
As a further improvement of the invention, the biofilm reactor is internally provided with a suspended filler, and in the step 2), the volume V is1Not less than the immersion volume of the suspended filler in the biofilm reactor in the step 3).
As a further improvement of the invention, the amount of the carbon source pre-added in the step 1) is calculated according to the carbon-phosphorus ratio.
As a further improvement of the invention, the carbon-phosphorus ratio ranges from 15g/g to 40 g/g.
As a further improvement of the invention, the cycle number N is the ratio of the enrichment factor N to the recovery efficiency eta.
As a further improvement of the method, the range of the enrichment multiple N is 10-30, and the range of the recovery efficiency eta is 60-80%.
Compared with the prior art, the invention has the beneficial effects that:
according to the variable volume type operation method applied to the process for recovering phosphorus by the biomembrane method, the volume of the base liquid required to be prestored in the phosphorus recovery device and the volume of the carbon source which is added once are calculated in advance, and then the process is operated, so that the problems that the concentration of the phosphorus recovery liquid is greatly diluted and the volume of the phosphorus recovery liquid in the phosphorus recovery tank is difficult to control due to the additional carbon source in the process of recovering phosphorus by the biomembrane method are solved, meanwhile, the concentration of the phosphorus solution in the phosphorus recovery tank is improved most efficiently, the process time is greatly shortened, and the process efficiency is improved.
Drawings
FIG. 1 is a schematic flow chart of a process for recovering phosphorus by a biofilm method according to the present invention.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
Referring to fig. 1, the present invention provides a variable volume type operation method applied to a process of recovering phosphorus by a biofilm method, which includes a biofilm reactor 2, a phosphorus recovery tank 7 and a carbon source storage tank 8 respectively communicated with the biofilm reactor 2, and a control system (not shown). The carbon source stored in the carbon source storage tank 8 is sodium acetate, sodium propionate, glucose, and supernatant of sludge concentration or fermentation in the urban domestic sewage plant.
In one embodiment, the biofilm reactor 2 is a suspended-packing sequencing batch biofilm reactor. The effective volume of the biofilm reactor 2 is V0The volume of the phosphorus recovery tank 7 was also set to V0. According to the effective volume V of the biofilm reactor 20Phosphorus concentration C of phosphorus-containing wastewater, phosphorus concentration C of phosphorus recovery liquid pre-recovered according to need1Obtaining enrichment factor N, calculating the amount of the carbon source to be added, and calculating the volume V of the base liquid to be prestored in the phosphorus recovery tank 7 when the concentration of the recoverable phosphorus is reached1And the volume V of carbon source to be added at each time2. When the phosphorus concentration in the phosphorus recovery tank 7 is from the initial concentration C0The phosphorus concentration C is achieved by n times of anaerobic cycleslIn the process, after n times of circulation, the volume of the recovery liquid of the biomembrane reactor 2 in the anaerobic stage is not more than V0。
Example 1
Referring to FIG. 1, the effective volume V of a biofilm reactor 20The phosphorus concentration C of the phosphorus-containing wastewater is 5L, and the phosphorus concentration C of the phosphorus-containing wastewater is 5 mg/L. The base liquid prestored in the phosphorus recovery tank 7 is the initial phosphorus concentration C00mg/L of water, phosphorus concentration C of the recovered solution of phosphorus1At 50mg/L, the enrichment factor N is 10. The pre-added carbon source amount is 500mg, and the carbon-phosphorus ratio is oneTotal carbon source amount of anaerobic influent in the cycle is 20g/g than total phosphorus amount of aerobic influent), the concentration C of the carbon source in the carbon source storage tank 82Set to 10000 mg/L. The cycle number N is equal to N/eta, namely the cycle number N is equal to the enrichment multiple N to the recovery efficiency eta, and the recovery efficiency eta is 60-80 percent. In this example, η is 62.5%. The variable volume type operation method of the process for recovering phosphorus by the biomembrane method specifically comprises the following steps:
step 1) calculating the cycle number N/η 16 according to the effective volume 5L, the enrichment factor N is 10 and η is 62.5% of the biomembrane reactor 2, and calculating the phosphorus concentration C of the phosphorus-containing wastewater and the phosphorus concentration C of the pre-recovered phosphorus recovery solution according to the phosphorus concentration C of the phosphorus-containing wastewater being 5mg/L and the phosphorus concentration C of the pre-recovered phosphorus recovery solution150mg/L, the pre-added carbon source amount is 500mg, the carbon-phosphorus ratio is 20g/g, and the carbon source concentration C210000mg/L, calculating the volume V of the carbon source which needs to be added once2Is 50mL, so as to recalculate to obtain the pre-stored base liquid V in the phosphorus recovery device1＝V0-nV2＝4.2L；
Step 2) prestoring 4.2L of water in the phosphorus recovery tank 7 as base liquid for anaerobic treatment;
step 3) referring to the process A, adding 5L of phosphorus-containing wastewater into a biofilm reactor 2 through a first pump 1, and carrying out aerobic phosphorus absorption for 3 h; in the aerobic stage, the dissolved oxygen is controlled by controlling the aeration system, in the embodiment, the dissolved oxygen concentration is controlled to be about 6mg/L, and the biological membrane reactor 2 is stirred, wherein the rotating speed of the stirrer is 100 rpm-200 rpm, so that the phosphate in the phosphorus-containing wastewater is fully absorbed by the biological membrane; referring to the working procedure B, after the aerobic stage is finished, removing phosphorus in the biofilm reactor 2 to reach the standard, and emptying the wastewater through the second pump 2;
and 4) referring to the step C, after the aerobic process of the biofilm reactor 2 is finished, starting an anaerobic first cycle, and pumping 4.2L of base liquid in the phosphorus recovery tank 7 into the biofilm reactor 2 through the third pump 3 to immerse the added suspended filler. A carbon source having a volume of 50mL in a carbon source storage tank 8 was fed into the biofilm reactor 2 by a fourth pump 4 while stirring, and anaerobic phosphorus release was started at a stirrer rotation speed of 100rpm to 200 rpm. Referring to the process step D, after the anaerobic phosphorus release of the biofilm reactor 2 is completed, 4.25L of the phosphorus-containing solution in the biofilm reactor 2 is recovered to the phosphorus recovery tank 7 by the fifth pump 5 in preparation for the second circulation.
Step 5), firstly, carrying out the aerobic phosphorus absorption step of the step 3) again, namely adding 5L of phosphorus-containing wastewater with the phosphate concentration C of 5mg/L into the biofilm reactor 2 again for aerobic phosphorus absorption, and discharging 5L of wastewater in the biofilm reactor 2 after the aerobic stage is finished; then, the anaerobic phosphorus release step of the step 4) is carried out again, 4.25L of phosphorus recovery liquid (phosphate concentration is more than 0mg/L) in the phosphorus recovery tank 7 enters the biofilm reactor 2 through the third pump 3, the phosphorus recovery liquid accounts for 4.25L of the biofilm reactor 2, a carbon source with the volume of 50mL is added, and anaerobic phosphorus release is started; after the anaerobic phosphorus release of the biofilm reactor 2 is finished, the phosphorus-containing solution with the volume of 4.3L in the biofilm reactor 2 is recycled to the phosphorus recycling tank 7 through the fifth pump 5 again. Referring to procedure E, the steps 3) and 4) were circulated 16 times to obtain a phosphorus-containing solution of 5L volume in the phosphorus recovery tank 7.
The biofilm reactor 2 is operated under alternate aerobic and anaerobic conditions to absorb phosphorus under aerobic conditions and release phosphorus under anaerobic conditions, whereby a phosphorus-rich solution is recovered through the phosphorus recovery tank 7. And after each anaerobic cycle, the phosphorus concentration in the phosphorus recovery tank 7 is continuously improved, after 16 cycles, the volume 5L when the phosphorus concentration in the phosphorus recovery tank 7 reaches the recoverable concentration of 50mg/L is the volume of the reactor, and then the phosphorus-rich recovery liquid in the phosphorus recovery tank 7 is discharged for phosphorus recovery, so that one phosphorus recovery stage is completed.
In one embodiment, the enrichment factor N ranges from 10 to 30, and when the enrichment factor N reaches 30, if the recovery efficiency η is 60%, the cycle number N is 50, and if V is V2Still 50mL, then V1＝V0-nV2Will be less than the filler immersion volume, it is necessary to increase the carbon source concentration C in the carbon source storage tank2Increasing the carbon source concentration from 10000mg/L to 20000mg/L, then V225mL, in this case, V1＝V0-nV2This value is satisfied for the immersion volume, 3.75L.
Example 2
When C in the carbon source storage tank 8 is shown in FIG. 12When the preset value is 20000mg/L, the adding volume is reduced to V under the condition of keeping the total carbon source demand unchanged2＝25mL
At this time, C is obtained when the same enrichment factor N ≧ 10 is reached1Not less than 50mg/L and volume V of the recovered liquid1+nV23.65L + 38X 0.025L 4.6L, less than V0(5L)。
In example 2, the effective volume V of the biofilm reactor 20The phosphorus concentration C of the phosphorus-containing wastewater is 5L, and the phosphorus concentration C of the phosphorus-containing wastewater is 5 mg/L. The base liquid prestored in the phosphorus recovery tank 7 is the initial phosphorus concentration C00mg/L of water, phosphorus concentration C of the recovered solution of phosphorus1At 150mg/L, the enrichment factor N is 30. The carbon source amount pre-added is 500mg, and when the carbon-phosphorus ratio (the total carbon source amount of anaerobic intake water in one cycle is compared with the total phosphorus amount of aerobic intake water) is 20g/g, the concentration C of the carbon source in the carbon source storage tank 82The concentration was set to 20000 mg/L. The cycle number N is equal to N/eta, namely the cycle number N is equal to the enrichment multiple N to the recovery efficiency eta, and the recovery efficiency eta is 60-80 percent. In this example, η is 78.9%. The variable volume type operation method of the process for recovering phosphorus by the biomembrane method specifically comprises the following steps:
step 1) calculating the cycle number N/η 38 according to the enrichment factor N being 30 and η being 78.9 percent, and calculating the phosphorus concentration C of the phosphorus-containing wastewater being 5mg/L and the phosphorus concentration C of the phosphorus recovery liquid to be recovered150mg/L, the pre-added carbon source amount is 500mg, the carbon-phosphorus ratio is 20g/g, and the carbon source concentration C2Calculating to obtain the volume V of the carbon source to be added once as 20000mg/L225mL, 5L according to the effective volume of the biofilm reactor 2, and satisfies V1+nV2Less than V0Setting a pre-stored base liquid V in the phosphorus recovery device1Is 3.65L;
step 2) pre-storing 3.65L of water in the phosphorus recovery tank 7 as a base liquid for anaerobic treatment;
step 3) referring to the process A, adding 5L of phosphorus-containing wastewater into a biofilm reactor 2 through a first pump 1, and carrying out aerobic phosphorus absorption for 3 h; in the aerobic stage, the dissolved oxygen is controlled by controlling the aeration system, in the embodiment, the dissolved oxygen concentration is controlled to be about 6mg/L, and the biological membrane reactor 2 is stirred, wherein the rotating speed of the stirrer is 100 rpm-200 rpm, so that the phosphate in the phosphorus-containing wastewater is fully absorbed by the biological membrane; referring to the working procedure B, after the aerobic stage is finished, removing phosphorus in the biofilm reactor 2 to reach the standard, and emptying the wastewater through the second pump 2;
and 4) referring to the procedure C, after the aerobic process of the biofilm reactor 2 is finished, starting the anaerobic first cycle, and pumping 3.65L of base liquid in the phosphorus recovery tank 7 into the biofilm reactor 2 through the third pump 3 to immerse the added suspended filler. A carbon source having a volume of 25mL in a carbon source storage tank 8 was fed into the biofilm reactor 2 by a fourth pump 4 while stirring, and anaerobic phosphorus release was started at a stirrer rotation speed of 100rpm to 200 rpm. Referring to the process D, after the anaerobic phosphorus release of the biofilm reactor 2 is completed, the phosphorus-containing solution having a volume of 3.675L in the biofilm reactor 2 is recovered to the phosphorus recovery tank 7 by the fifth pump 5 in preparation for the second circulation.
Step 5), firstly, carrying out the aerobic phosphorus absorption step of the step 3) again, namely adding 5L of phosphorus-containing wastewater with the phosphate concentration C of 5mg/L into the biofilm reactor 2 again for aerobic phosphorus absorption, and discharging 5L of wastewater in the biofilm reactor 2 after the aerobic stage is finished; then, the anaerobic phosphorus release step of the step 4) is carried out again, the phosphorus recovery liquid (phosphate concentration >0mg/L) with the volume of 3.675L in the phosphorus recovery tank 7 enters the biofilm reactor 2 through the third pump 3, the volume of the phosphorus recovery liquid accounts for 3.675L in the biofilm reactor 2, a carbon source with the volume of 25mL is added, and the anaerobic phosphorus release is started; after the anaerobic phosphorus release of the biofilm reactor 2 is finished, the phosphorus-containing solution with the volume of 3.7L in the biofilm reactor 2 is recycled to the phosphorus recycling tank 7 through the fifth pump 5 again. Referring to procedure E, step 3) and step 4) were cycled 38 times to obtain a 4.6L volume of phosphorus-containing solution in the phosphorus recovery tank 7.
The biofilm reactor 2 is operated under alternate aerobic and anaerobic conditions to absorb phosphorus under aerobic conditions and release phosphorus under anaerobic conditions, whereby a phosphorus-rich solution is recovered through the phosphorus recovery tank 7. And after each anaerobic cycle, the phosphorus concentration in the phosphorus recovery tank 7 is continuously improved, after 38 cycles, the volume of 4.6L when the phosphorus concentration in the phosphorus recovery tank 7 reaches the recoverable concentration of 150mg/L is smaller than that of the reactor, but the phosphorus-rich recovery liquid (the phosphate concentration is more than or equal to 50mg/L) in the phosphorus recovery tank 7 can still be discharged for phosphorus recovery, so far, the completion of a phosphorus recovery stage is also realized.
According to the variable volume type operation method applied to the process for recovering phosphorus by the biomembrane method, the volume of the base liquid required to be prestored in the phosphorus recovery device and the volume of the carbon source added at a single time are calculated in advance, and then the process is operated, so that the problems that the concentration of the phosphorus recovery liquid is greatly diluted and the volume of the phosphorus recovery liquid in the phosphorus recovery tank is difficult to control due to the additional carbon source in the process of recovering phosphorus by the biomembrane method are solved, meanwhile, the concentration of the phosphorus solution in the phosphorus recovery tank is improved most efficiently, the process time is greatly shortened, and the process efficiency is improved. In addition, the requirement on the volume of the phosphorus recovery tank is reduced, and the process cost is reduced.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. A variable volume type operation method applied to a process for recovering phosphorus by a biomembrane method is characterized by comprising the following steps:
1) according to the effective volume V of the biofilm reactor0Phosphorus concentration of phosphorus-containing wastewater, phosphorus concentration of a pre-recovered phosphorus recovery solution, enrichment times and pre-added carbon source amount, and calculating and setting volume V of a base solution to be prestored in a phosphorus recovery device1And single passVolume V of carbon source dosed2；
2) Prestoring the volume of V in the phosphorus recovery device1The base liquid of (3);
3) under aerobic condition, the phosphorus-containing wastewater enters a biomembrane reactor, and is discharged after aerobic absorption of phosphorus;
4) under the anaerobic condition, adding the solution in the phosphorus recovery device into the biofilm reactor, and adding the solution with the volume of V2After anaerobic phosphorus release by the biomembrane, recovering the phosphorus-containing solution in the biomembrane reactor to a phosphorus recovery device;
5) the step 3) and the step 4) are circulated for n times, and the volume V is obtained in a phosphorus recovery device1+nV2When the concentration of the phosphorus-containing solution reaches a recoverable phosphorus concentration, the cycle is stopped, and at this time, V1,V2And V0Satisfy the relationship between V1+nV2≤V0，
Wherein n is an integer.
2. The variable volume operation method applied to the process of recovering phosphorus by the biofilm method as recited in claim 1, wherein the base liquid in the step 2) is water with a phosphorus concentration of 0.
3. The variable displacement operation method of claim 1 applied to a process for recovering phosphorus by a biofilm method, wherein the volume of the phosphorus-containing wastewater entering the biofilm reactor is V under aerobic conditions in each circulation process0。
4. The variable volume operation method applied to the process of recovering phosphorus by the biofilm method as recited in claim 1, wherein in the step 5), the recoverable phosphorus concentration of the phosphorus-containing solution is not less than 50 mg/L.
5. The variable volume operation method applied to the process of recovering phosphorus by the biofilm method as recited in claim 4, wherein in the step 5), the recoverable phosphorus concentration of the phosphorus-containing solution is 50mg/L to 300 mg/L.
6. The variable volume operation method applied to the process of recovering phosphorus by the biofilm method as claimed in claim 1, wherein the biofilm reactor is internally provided with a suspended filler, and in the step 2), the volume V is1Not less than the immersion volume of the suspended filler in the biofilm reactor.
7. The variable volume type operation method applied to the process of recovering phosphorus by the biofilm method according to claim 1, wherein the amount of the carbon source pre-added in the step 1) is calculated according to a carbon-phosphorus ratio.
8. The variable volume type operation method applied to the process of recovering phosphorus by the biofilm method according to claim 7, wherein the carbon-phosphorus ratio is in a range of 15g/g to 40 g/g.
9. The variable volume operation method applied to the process for recovering phosphorus by the biofilm method as recited in claim 1, wherein the cycle number N is a ratio of the enrichment multiple N to the recovery efficiency eta.
10. The variable volume operation method applied to the process of recovering phosphorus by the biofilm method according to claim 9, wherein the enrichment multiple N is in a range of 10 to 30, and the recovery efficiency η is in a range of 60 to 80%.
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