CN107311308B - Process for synchronously removing and enriching phosphorus by biomembrane method - Google Patents
Process for synchronously removing and enriching phosphorus by biomembrane method Download PDFInfo
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- CN107311308B CN107311308B CN201610265788.8A CN201610265788A CN107311308B CN 107311308 B CN107311308 B CN 107311308B CN 201610265788 A CN201610265788 A CN 201610265788A CN 107311308 B CN107311308 B CN 107311308B
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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
- C02F3/308—Biological phosphorus removal
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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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
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Abstract
The invention discloses a process for synchronously removing and enriching phosphorus by a biomembrane method, which comprises a biomembrane reactor, a phosphorus recovery device and a control system, and the process comprises the following specific steps: step 1) putting biofilm carriers after biofilm formation into the biofilm reactor; and 2) alternately operating the biofilm reactor under aerobic and anaerobic conditions, removing phosphorus from the phosphorus-containing wastewater under the aerobic condition, and recovering the phosphorus-rich solution through a phosphorus recovery device under the anaerobic condition. The process can be used for removing phosphorus in domestic sewage or industrial wastewater, realizes the enrichment and recovery of phosphorus solution synchronously through the biological action of phosphorus accumulating bacteria, generates a very small amount of sludge in the process, and consumes less energy in the operation process.
Description
Technical Field
The invention relates to the field of biological sewage treatment, in particular to a process for synchronously removing and enriching phosphorus by a biomembrane method.
Background
Phosphorus as an important resource has dual characteristics of scarcity and pollution, and phosphorus in urban sewage plants becomes a main source for future phosphorus resource recovery.
The enhanced biological phosphorus removal process (EPBR) used by the existing municipal sewage plant mainly removes phosphorus in sewage by discharging excess sludge, so that the method has higher sludge yield; in the aspect of phosphorus recovery, for example, an enhanced biological phosphorus removal sidestream phosphorus recovery method which is put into operation, the struvite phosphorus recovery is carried out on anaerobic supernatant of excess sludge, and the method and other methods for recovering phosphorus from sludge have the problems that phosphorus circulates in the sludge for many times, not only consumes excessive energy and generates excessive greenhouse gases, but also the recovery and removal of phosphorus require respective processes, so that the method has higher technical and economic costs.
Since the organisms on the biofilm have the characteristics of long generation time and large biomass, the biofilm method is widely used for removing phosphorus in sewage due to high treatment efficiency and low operation cost.
Disclosure of Invention
The invention aims to solve the problems and provides a process for synchronously removing and enriching phosphorus by a biofilm method, so that phosphorus removal and phosphorus solution enrichment and recovery are synchronously realized.
In order to achieve the purpose, the invention provides a process for synchronously removing and enriching phosphorus by a biofilm method, which comprises a biofilm reactor, a phosphorus recovery device and a control system, and the process comprises the following specific steps:
step 1) putting biofilm carriers after biofilm formation into the biofilm reactor;
and 2) alternately operating the biofilm reactors under aerobic and anaerobic conditions, removing phosphorus from the phosphorus-containing wastewater under the aerobic condition, and recovering the phosphorus-rich solution to a phosphorus recovery device under the anaerobic condition.
Further, in the step 1), the biofilm formation of the biological filler is carried out in activated sludge.
Further, in the step 2), the operation of the biofilm reactor also comprises an early stage, through aerobic and anaerobic alternate reaction conditions and a period of acclimation and culture, the concentration of phosphorus in the effluent tends to be stable, and high-concentration phosphorus accumulating bacteria are enriched on the biofilm.
Furthermore, the inlet water under the aerobic condition is phosphorus-containing wastewater, and the inlet water under the anaerobic condition is prepared into phosphorus-rich base solution which can be repeatedly used.
Further, under the aerobic condition, the phosphorus-containing wastewater enters the biofilm reactor provided with the aeration device, and the biofilm absorbs phosphorus through aerobic absorption for a period of time, so that the treated wastewater is directly discharged.
Further, the biomembrane reactor takes a clean water source as a phosphorus-rich base solution under an anaerobic condition, the phosphorus-rich base solution is stored in a phosphorus recovery device, the phosphorus-rich base solution is introduced into the biomembrane reactor to carry out anaerobic phosphorus release for a period of time, the phosphorus concentration in the phosphorus-rich base solution continuously rises, and a phosphorus-rich solution with high phosphorus concentration obtained by enrichment for a period of time is recovered to the phosphorus recovery device.
Furthermore, during the process of anaerobic phosphorus release after the phosphorus-rich base solution is introduced into the biofilm reactor for a period of time, a certain amount of easily degradable carbon sources which can be utilized by phosphorus accumulating bacteria, such as methanol, ethanol, acetic acid or wastewater containing the carbon sources, are also added, so that the phosphorus accumulating bacteria on the biofilm release phosphorus into the phosphorus-rich base solution.
Further, the phosphorus-rich solution is lifted to a phosphorus recovery device by a lift pump for recovery.
Further, the phosphorus recovery device comprises a phosphorus recovery pool, a phosphorus recovery tank or a phosphorus recovery barrel.
Furthermore, the system comprises a plurality of groups of running sequencing batch biofilm reactors which are rich in phosphorus accumulating bacteria and connected in parallel.
Compared with the prior art, the invention has the advantages that: the process can be used for removing phosphorus in domestic sewage or industrial wastewater, realizes the enrichment and recovery of phosphorus solution synchronously through the biological action of phosphorus accumulating bacteria, generates a very small amount of sludge in the process, and consumes less energy in the operation process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic flow chart of a process for synchronously removing and enriching phosphorus by a biofilm method according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a first operating condition of a combined biological treatment system for simultaneous phosphorus removal and enrichment according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of a second embodiment of a combined biological treatment system for simultaneous phosphorus removal and enrichment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, a biofilm process for synchronously removing and enriching phosphorus according to an embodiment of the present invention relates to an apparatus including: a biofilm reactor 1, an aeration device 4 arranged in the biofilm reactor 1, a phosphorus recovery tank 2 communicated with the biofilm reactor 1, a lift pump 3 for lifting a phosphorus-rich solution, and a control system (not shown in the figure) for controlling parameters such as water inlet time, water inlet amount, aeration time and the like.
The specific process steps are as follows:
step 1) putting biofilm-forming biological fillers such as elastic fillers, nylon fillers, fiber fillers, combined fillers and the like into the biofilm reactor 1.
Selecting a proper material as a biological filler, and placing the biological filler into the biofilm reactor after the biofilm formation in the activated sludge is successful. The biofilm formation is a biological film formed by bacteria, fungi, protozoa, algae and other microorganisms attached and grown on the outer layer of the biological filler, and the phosphorus-accumulating biological film which takes phosphorus-accumulating bacteria as dominant bacterial colonies is screened out by phosphorus solution with certain concentration through anaerobic and aerobic alternate operation.
And step 2) alternately operating the biofilm reactors under aerobic and anaerobic conditions, removing phosphorus from the phosphorus-containing wastewater under the aerobic condition, and recovering the phosphorus-rich liquid to the phosphorus recovery tank 2 under the anaerobic condition.
In this embodiment, the phosphorus recovery tank is used as the phosphorus recovery device, and in other embodiments, a phosphorus recovery tank or a phosphorus recovery barrel may be used.
In the biofilm reactor 1, an aerobic environment is provided by the aeration device 4. The operation of the biofilm reactor 1 is divided into two stages, including a front stage and an enrichment and recovery stage, and each stage can operate under the condition of alternating aerobic and anaerobic conditions.
In the early stage of operation, the biofilm reactor 1 firstly enriches high-concentration phosphorus-accumulating bacteria on a biofilm through a period of acclimation and culture under an aerobic and anaerobic alternate reaction condition, and starts to enter an enrichment and recovery stage after monitoring that the concentration of phosphorus in effluent tends to be stable.
The biofilm reactor 1 removes phosphorus under aerobic conditions and recovers a phosphorus-rich solution under anaerobic conditions in an enrichment and recovery stage. In the aerobic stage, phosphorus-containing wastewater enters the biofilm reactor 1 (namely water inlet in the figure 1), an appropriate amount of air is provided by using an aeration device 4 to enable the biofilm reactor 1 to be in the aerobic stage, the biofilm absorbs phosphorus through aerobic absorption for a period of time, so that the phosphorus concentration in the solution is reduced to a dischargeable standard, and then the treated wastewater is directly discharged (namely water discharge in the figure 1); in the anaerobic stage, tap water or other clean water sources are used as phosphorus-rich base liquid and stored in a recovery tank 2, the phosphorus-rich base liquid is introduced into a biomembrane reactor 1, a certain amount of easily degradable carbon sources which can be utilized by phosphorus accumulating bacteria, such as methanol, ethanol, acetic acid or wastewater containing the carbon sources, are added to enable the phosphorus accumulating bacteria on the biomembrane to release phosphorus into the phosphorus-rich base liquid, the phosphorus concentration in the phosphorus-rich base liquid is continuously increased after a period of anaerobic phosphorus release, the phosphorus-rich solution is repeatedly used in the anaerobic stage, the phosphorus-rich solution with high phosphorus concentration is obtained after a period of time enrichment, the phosphate concentration of the phosphorus-rich solution can reach 50-125mg/l, the total recovery time can be controlled according to the concentration requirement to realize the recovery of the phosphorus-rich solution with different concentrations, and the phosphorus-rich solution is lifted into the phosphorus recovery tank 2 for recovery.
The process for synchronously removing and enriching phosphorus by the biomembrane method provided by the embodiment of the invention can be used for removing phosphorus in domestic sewage or industrial wastewater, synchronously realizes phosphorus removal and phosphorus-rich solution concentration through the biological action of phosphorus-accumulating bacteria, has high efficiency and meets the requirement of future recovery of resources in sewage. Compared with an activated sludge system with suspension growth, the process generates a very small amount of sludge, and meets the requirements of sustainable wastewater treatment technology. In addition, the process has less energy consumption in the operation process, saves energy and meets the economic requirement of the market on the new process.
Referring to fig. 2 and 3, the embodiment of the present invention also provides a combined biological treatment system for simultaneous removal and enrichment of phosphorus, which is formed in parallel with two groups of the same biofilm reactors, and has the following two working conditions.
FIG. 2 shows the operation state of the first working condition, the biofilm reactor A1 is in the aerobic stage, the phosphorus-containing wastewater enters the air biofilm reactor A1 provided with an aeration device, the biofilm absorbs phosphorus through a period of aerobic absorption, so that the phosphorus concentration in the solution is reduced to the dischargeable standard, and then the treated wastewater is directly discharged; meanwhile, the biomembrane reactor A2 is in an anaerobic recovery stage, tap water or other clean water source is used as phosphorus-rich base liquid, the phosphorus-rich base liquid is stored in a phosphorus-rich solution recovery tank B, the phosphorus-rich base liquid is introduced into the biomembrane reactor A2, and easily degradable carbon sources which can be utilized by phosphorus-accumulating bacteria, such as methanol, ethanol, acetic acid or wastewater containing the carbon sources, are added to enable the phosphorus-accumulating bacteria on the biomembrane to release phosphorus into the phosphorus-rich base liquid, the phosphorus concentration in the phosphorus-rich base liquid is continuously increased after a period of anaerobic phosphorus release, the phosphorus-rich solution is repeatedly used in the anaerobic stage, and the phosphorus-rich solution with high phosphorus concentration is obtained after a period of enrichment.
Fig. 3 shows the operating conditions of condition two, with biofilm reactor a1 in the anaerobic recovery stage and biofilm reactor a2 in the aerobic stage. The phosphorus-containing wastewater enters an air biofilm reactor A2 provided with an aeration device, the biofilm absorbs phosphorus through aerobic absorption for a period of time, so that the phosphorus concentration in the solution is reduced to a dischargeable standard, and then the treated wastewater is directly discharged; meanwhile, the biomembrane reactor A1 is in an anaerobic recovery stage, tap water or other clean water source is used as phosphorus-rich base liquid, the phosphorus-rich base liquid is stored in a phosphorus-rich solution recovery tank B, the phosphorus-rich base liquid is introduced into the biomembrane reactor A1, a certain amount of easily degradable carbon sources which can be utilized by phosphorus-accumulating bacteria, such as methanol, ethanol, acetic acid or wastewater containing the carbon sources, are added, so that the phosphorus-accumulating bacteria on the biomembrane release phosphorus into the phosphorus-rich base liquid, the phosphorus concentration in the phosphorus-rich base liquid continuously rises after a period of anaerobic phosphorus release, the phosphorus-rich solution is repeatedly used in the anaerobic stage, and the phosphorus-rich solution with high phosphorus concentration is obtained after a period of enrichment.
And the working condition I and the working condition II are switched back and forth, so that continuous flow water inflow can be completed, and the anaerobic phosphorus-rich solution can be synchronously recovered.
By utilizing the combined biological treatment system for synchronously removing and enriching phosphorus, provided by the embodiment of the invention, the synchronous removal and recovery of phosphorus can be realized. It is also possible to select a different number of biofilm reactor combinations depending on the time of the reaction cycle, so that the whole system becomes a continuous flow.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A process for synchronously removing and enriching phosphorus by a biomembrane method is characterized by comprising the biomembrane reactor, a phosphorus recovery device and a control system, and the process comprises the following specific steps:
step 1) putting biofilm carriers after biofilm formation into the biofilm reactor;
and 2) alternately operating the biofilm reactor under aerobic and anaerobic conditions, firstly removing phosphorus from phosphorus-containing wastewater under aerobic conditions, then storing the phosphorus-containing wastewater in the phosphorus recovery device by taking a clean water source as a phosphorus-rich base solution under anaerobic conditions, allowing the phosphorus-rich base solution to pass through the biofilm reactor for anaerobic phosphorus release to form a phosphorus-rich solution, and recovering the phosphorus-rich solution to the phosphorus recovery device.
2. The process for synchronously removing and enriching phosphorus by the biofilm method as claimed in claim 1, wherein in the step 1), the biofilm culturing of the biological filler is carried out in activated sludge.
3. The process of claim 1, wherein the biofilm reactor in step 2) is operated to further comprise a preliminary stage, wherein the concentration of phosphorus in the effluent is stabilized by acclimatization and cultivation for a period of time under an aerobic and anaerobic alternate reaction condition, and the biofilm is enriched with high-concentration phosphorus-accumulating bacteria.
4. The process for synchronously removing and enriching phosphorus by the biofilm method as claimed in claim 3, wherein the inlet water under the aerobic condition is phosphorus-containing wastewater, and the inlet water under the anaerobic condition is phosphorus-rich base solution which can be used repeatedly.
5. The process of claim 1 for synchronous phosphorus removal and enrichment by a biofilm process, wherein the biofilm reactor is characterized in that under aerobic conditions, phosphorus-containing wastewater enters the biofilm reactor provided with an aeration device, and the biofilm absorbs phosphorus through aerobic absorption for a period of time, and the treated wastewater is directly discharged.
6. The process of claim 1, wherein the biofilm reactor is used for introducing the phosphorus-rich base solution into the biofilm reactor under anaerobic conditions for anaerobic phosphorus release for a period of time, the phosphorus concentration in the phosphorus-rich base solution continuously rises, and the phosphorus-rich solution with high phosphorus concentration obtained after a period of time of enrichment is recycled to a phosphorus recovery device.
7. The process for synchronously removing and enriching phosphorus by a biofilm method according to claim 6, wherein a certain amount of easily degradable carbon source which can be utilized by phosphorus accumulating bacteria is added in the process of introducing the phosphorus-rich base solution into the biofilm reactor for anaerobic phosphorus release for a period of time so that the phosphorus accumulating bacteria on the biofilm release phosphorus into the phosphorus-rich base solution.
8. The process for synchronously removing and enriching phosphorus by the biofilm method as claimed in claim 6, wherein the phosphorus-rich solution is lifted to a phosphorus recovery device by a lift pump for recovery.
9. The process for synchronously removing and enriching phosphorus by the biofilm method according to any one of claims 1, 6 and 8, wherein the phosphorus recovery device is one of a phosphorus recovery tank, a phosphorus recovery tank or a phosphorus recovery barrel.
10. The biofilm process for synchronously removing and enriching phosphorus according to claim 1, which comprises a plurality of groups of running sequencing batch biofilm reactors rich in phosphorus accumulating bacteria in parallel.
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| CN109485137A (en) * | 2018-11-27 | 2019-03-19 | 济南大学 | A kind of ion exchange membrane bioreactor and its application |
| CN110563156B (en) * | 2019-08-23 | 2023-12-26 | 宁夏元蔚环保科技有限公司 | SBBR sewage treatment device and method for high-efficiency denitrification and dephosphorization |
| CN110668560B (en) * | 2019-10-28 | 2021-09-28 | 苏州科技大学 | Continuous biological nitrogen and phosphorus removal recovery system and process |
| CN111170471B (en) * | 2020-01-16 | 2021-12-17 | 浙江永续环境工程有限公司 | Composite phosphorus-accumulating bacteria flowing biological bed membrane method |
| CN111646573B (en) * | 2020-06-23 | 2021-11-23 | 苏州科技大学 | Phosphorus removal and recovery method by using organic carbon source in municipal sewage |
| CN112645448B (en) * | 2020-11-30 | 2022-08-02 | 苏州科技大学 | Variable volume type operation method applied to process for recovering phosphorus by biomembrane method |
| CN112661266B (en) * | 2020-11-30 | 2023-04-25 | 苏州科技大学 | Process for enriching phosphorus and recovering wustite by using biomembrane method |
| CN113023887A (en) * | 2021-02-03 | 2021-06-25 | 河海大学 | Phosphorus enrichment method and system based on membrane bioreactor |
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| JPH09299977A (en) * | 1996-05-15 | 1997-11-25 | Hiroyuki Harada | Method for removing or recovering phosphorous in sewage |
| US6893567B1 (en) * | 2001-07-13 | 2005-05-17 | The United States Of America As Represented By The Secretary Of Agriculture | Wastewater treatment system |
| CN1242941C (en) * | 2003-11-04 | 2006-02-22 | 广州大学 | Method for treating urban sewage through denitrifying process for phophorous removal and defluorination in biomembrane system in sequential batch mode |
| CN100372784C (en) * | 2006-02-08 | 2008-03-05 | 哈尔滨工业大学 | Sludge outer circulation type sewage treatment method of denitrifying and recovering phosphor using composite membrane bioreactor |
| CN101654312B (en) * | 2009-07-17 | 2012-02-01 | 东华大学 | Device and method for continuously operation and reinforcement of biomembrane phosphate removing |
| CN102503035B (en) * | 2011-11-09 | 2013-06-05 | 东华大学 | Biological phosphorus accumulating and phosphorus recycling method for treating phosphorus-containing liquid waste |
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