CN111744366A - Device and method for testing oxygen transfer performance of MABR (moving active biofilm reactor) membrane - Google Patents
Device and method for testing oxygen transfer performance of MABR (moving active biofilm reactor) membrane Download PDFInfo
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- 239000001301 oxygen Substances 0.000 title claims abstract description 129
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 129
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 239000012528 membrane Substances 0.000 title claims abstract description 110
- 238000012546 transfer Methods 0.000 title claims abstract description 76
- 238000012360 testing method Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005273 aeration Methods 0.000 claims abstract description 69
- UEKDBDAWIKHROY-UHFFFAOYSA-L bis(4-bromo-2,6-ditert-butylphenoxy)-methylalumane Chemical compound [Al+2]C.CC(C)(C)C1=CC(Br)=CC(C(C)(C)C)=C1[O-].CC(C)(C)C1=CC(Br)=CC(C(C)(C)C)=C1[O-] UEKDBDAWIKHROY-UHFFFAOYSA-L 0.000 claims abstract 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 65
- 239000007789 gas Substances 0.000 claims description 31
- 230000001105 regulatory effect Effects 0.000 claims description 21
- 238000005070 sampling Methods 0.000 claims description 18
- 239000003054 catalyst Substances 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 19
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 5
- 239000010865 sewage Substances 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 3
- 238000006213 oxygenation reaction Methods 0.000 description 12
- 239000007788 liquid Substances 0.000 description 10
- 230000001276 controlling effect Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical group [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 4
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical group [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 235000010265 sodium sulphite Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001429 cobalt ion Inorganic materials 0.000 description 1
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001706 oxygenating effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/10—Testing of membranes or membrane apparatus; Detecting or repairing leaks
-
- 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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/20—Activated sludge processes using diffusers
- C02F3/208—Membrane aeration
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- 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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a device and a method for testing oxygen transfer performance of an MABR membrane, and belongs to the field of sewage treatment. The invention constructs and designs a set of detection device suitable for the MABR special oxygen transfer aeration model and a standard determination method, is used for determining the aeration oxygen transfer performance of the MABR membrane material, and accurately calculates the related oxygen transfer parameters, and provides a reliable theoretical basis for researching the oxygen transfer rule of the MABR membrane material and material development and design application.
Description
Technical Field
The invention belongs to the field of sewage treatment, and particularly relates to a device and a method for testing oxygen transfer performance of an MABR (moving activated biofilm reactor) membrane.
Background
In the field of sewage treatment, aerobic aeration is a very important link, the adopted aeration forms and equipment are various, and the quality judgment of the aeration equipment and the aeration forms is necessary before engineering application.
The MABR technology is a bubble-free aeration sewage treatment process using an oxygen permeable membrane material as an oxygen transfer medium. The MABR technology has the advantages that by utilizing the high oxygen permeability of the membrane material and the oxygen concentration difference on two sides of the membrane and adopting a bubble-free aeration mode, oxygen-enriched air is not directly contacted with a water body, but by utilizing the permeation principle of the membrane material, molecular oxygen transfers mass from the oxygen-enriched side of the membrane to the low-oxygen water body, the needed gas flow is very little compared with the common micropore aeration mode, and the oxygen utilization rate and the oxygen transfer power efficiency are very high. The testing of the oxygen transfer performance of the MABR membrane is very significant for the design and application of the MABR technology.
Through retrieval, the Chinese patent application with the application number of 201510223267.1 and the application date of 2015, 5 and 5 discloses an aeration and oxygenation device and a method for detecting the oxygenation capacity of liquid, wherein the aeration and oxygenation device comprises a container and an aeration device arranged in the container, and an oxygen dissolving instrument for detecting the oxygen concentration of the liquid in the container is also arranged in the container; the air blowing device is communicated with the air blowing device through a pipeline; the pipeline is provided with a flow meter for detecting air quantity and a pressure meter for detecting air pressure;
the invention detects the liquid oxygenation capacity by utilizing the aeration oxygenation device, the detection steps comprise firstly filling liquid into a container, adding a deoxidizing agent until the reading of a dissolved oxygen meter is 0mg/L, then starting a blast device, oxygenating the container by the aeration device in the container, observing the aeration pressure by a pressure gauge, and observing the air quantity by a flowmeter; finally, recording the saturated dissolved oxygen concentration Cs and the dissolved oxygen concentration Ct at the operating temperature in the liquid in the container through an oxygen dissolving instrument to obtain the oxygenation capacity of the liquid in the container and further obtain the oxygenation capacity of the liquid in the containerOxygen utilization efficiency E of liquid and kinetic efficiency E of liquid in containerpThe aeration oxygenation device has the advantages that the aeration dissolved oxygen condition, the aeration bottom matrix reaction area, the air-water stirring effect and the like can be observed on site, the oxygenation performance of the aerator can be rapidly measured by the dissolved oxygen instrument on the aeration oxygenation device, and theoretical and technical support is provided for the operation of sewage and wastewater treatment engineering.
However, because of the special oxygen transfer model of the MABR, the oxygenation performance detection method of a common aeration device is not suitable for standardized comparison and judgment of the oxygen transfer performance of the MABR aeration material. Therefore, a method suitable for testing the oxygen transfer performance of the MABR membrane is needed to research the rule of oxygen transfer into the water body by the aeration, and a reliable theoretical basis is provided for the development, design and application of the MABR membrane material.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that a detection device in the prior art cannot detect the oxygen transfer performance of an MABR aeration material, the invention provides a device and a method for testing the oxygen transfer performance of an MABR membrane. The invention provides a reliable theoretical basis for researching the oxygen transfer rule of the MABR membrane material and developing and designing materials by constructing and designing a set of detection device and a standard determination method for determining the aeration oxygen transfer performance of the MABR membrane material and calculating the relevant oxygen transfer parameters.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the device for testing the oxygen transfer performance of the MABR membrane comprises a reactor body, a circulating unit, an air supply unit and a water inlet unit, wherein a first circulating port is formed in the top of the reactor body and connected with the circulating unit through a first circulating pipeline; the bottom of the reactor body is provided with a second circulating port, and the second circulating port is connected with the circulating unit through a second circulating pipeline; and is
An MABR membrane is arranged in the reactor body, a main gas inlet pipe is arranged above the MABR membrane, one end of the main gas inlet pipe is connected with a gas supply unit through a gas supply pipeline, a gas outlet header is arranged below the MABR membrane, and one end of the gas outlet header is connected with an exhaust pipeline;
wherein, be provided with the charging conduit on the first circulating line to be provided with inlet channel and sample pipeline on the second circulating line, inlet channel links to each other with the water inlet unit.
Preferably, the reactor body is provided with an oxygen dissolving instrument.
Preferably, a first circulating valve is arranged on the first circulating pipeline, and a second circulating valve is arranged on the second circulating pipeline.
Preferably, the gas supply pipeline is provided with a first regulating valve, and the gas exhaust pipeline is provided with a second regulating valve.
Preferably, a water inlet valve is arranged on the water inlet pipeline, a charging valve is arranged on the charging pipeline, and a sampling valve is arranged on the sampling pipeline.
Preferably, a flow meter is provided on the air supply pipe between the air supply unit and the first regulating valve, and a pressure sensor is provided on the exhaust pipe between the air outlet header and the second regulating valve.
The method for testing the oxygen transfer performance of the MABR membrane by adopting the device for testing the oxygen transfer performance of the MABR membrane comprises the following steps:
s10, deoxidation: filling water into the whole reactor body, adding a deoxidizing agent and a catalyst into the reactor body, starting a circulating unit, and uniformly mixing the water in the reactor body with the deoxidizing agent and the catalyst to perform a deoxidizing reaction;
s20, aeration: when the concentration of dissolved oxygen in the water in the reactor body is 0, sampling the water in the reactor body, and detecting SO in the water4 2-Concentration as initial SO in the aerated zero reactor body4 2-And then, starting the gas supply unit to supply gas to the MABR membrane, aerating the reactor body through the MABR membrane, sampling every 4-6min, and detecting the concentration of dissolved oxygen and SO in water in the reactor body4 2-Stopping testing when the concentration is 1-3h after aeration or the content of dissolved oxygen in the water body is not increased any more;
s30, calculating: respectively calculating the MABR membrane aeration oxygen total transfer coefficient Kla, the unit MABR membrane area oxygen transfer rate OTR and the MABR membrane oxygen transfer kinetic efficiency Ep according to the following formulas (1) to (3),
wherein:
t-t0: aeration time, min;
C0: the dissolved oxygen concentration in the aeration zero point reactor body is mg/L;
cs: saturated dissolved oxygen value at aeration temperature, mg/L;
ct: when the aeration time is t, the dissolved oxygen value in the reactor body is mg/L;
nt: when the aeration time is t, SO is in the reactor body4 2-Concentration, mg/L;
N0: SO in the zero point aeration reactor body4 2-Concentration, mg/L;
s: membrane area, m, of MABR membranes tested2；
V: effective volume of the reactor body, L;
p: power of the gas supply unit, kw.
Preferably, in step S10, the mass ratio between the dissolved oxygen in the water in the reactor body (100) and the added deoxidizer is 1: 7-1: 9.
preferably, in step S20, the gas supply unit (300) is turned on to supply gas to the MABR membrane (110), wherein the pressure inside the MABR membrane (110) is controlled to be 15-20 kPa.
Preferably, in step S30, the MABR membrane aeration oxygen total transfer coefficient Kla is subjected to temperature correction by using the following formula (4) to obtain a corrected MABR membrane aeration oxygen total transfer coefficient Kla,
Kla(20℃)＝Kla(T)·1.024T-20(4)
wherein: and T is the aeration temperature of the MABR membrane.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention relates to a device for testing the oxygen transfer performance of an MABR (moving active biofilm reactor) membrane, which comprises a reactor body, a circulating unit and an air supply unit, wherein the MABR membrane is arranged in the reactor body, the air supply unit supplies air to the MABR membrane, and the circulating unit ensures that water flow in the reactor body achieves a mixing effect under the condition of insufficient bubble disturbance;
(2) the device for testing the oxygen transfer performance of the MABR membrane is a set of fully-closed device, so that the oxygen transfer on the gas-liquid contact surface of air and a water phase is prevented, and the accuracy of experimental data is influenced;
(3) the method for testing the oxygen transfer performance of the MABR membrane overcomes the defect that the influence of continuous reaction of excessive deoxidizer and partial mass transfer oxygen is not considered in the traditional oxygenation testing method, provides an oxygen transfer performance testing method suitable for an MABR special oxygen transfer aeration model, and accurately measures and calculates various performances of MABR membrane aeration.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for testing oxygen transfer performance of an MABR membrane according to the present invention;
in the figure:
100. a reactor body; 110. an MABR membrane; 111. a main air inlet pipe;
112. an air outlet header; 120. an oxygen dissolving instrument; 200. a circulation unit;
201. a first circulation port; 202. a second circulation port; 210. a first circulation pipe;
211. a first circulation valve; 220. a second circulation pipe; 221. a second circulation valve;
300. an air supply unit; 310. a gas supply duct; 311. a first regulating valve;
312. a flow meter; 320. an exhaust duct; 321. a second regulating valve; 322. a pressure sensor;
400. a water inlet unit; 410. a water inlet pipe; 411. a water inlet valve;
510. a feed line; 511. a feed valve; 610. a sampling pipe; 611. and a sampling valve.
Detailed Description
The invention is further described with reference to specific examples.
As shown in fig. 1, an apparatus for testing oxygen transfer performance of an MABR membrane according to the present invention includes a reactor body 100, a circulation unit 200, a gas supply unit 300, and a water inlet unit 400; generally, the specification (length × width × height) of the reactor body 100 is 30cm × 10cm × 1200cm, and the circulation unit 200 is a circulation pump, the air supply unit 300 is an air supply fan, and the water inlet unit 400 is a water inlet pump;
a first circulation port 201 is arranged at the top of the reactor body 100, the first circulation port 201 is connected with the circulation unit 200 through a first circulation pipeline 210, a first circulation valve 211 is arranged on the first circulation pipeline 210, and the first circulation port 201 is controlled by opening or closing the first circulation valve 211; the first circulation pipeline 210 is further provided with a feeding pipeline 510 for feeding materials such as deoxidizer and catalyst to the reactor body 100, and the feeding pipeline 510 is provided with a feeding valve 511 for controlling the feeding of the materials by opening or closing the feeding valve 511;
the bottom of the reactor body 100 is provided with a second circulation port 202, the second circulation port 202 is connected with the circulation unit 200 through a second circulation pipeline 220, the second circulation pipeline 220 is provided with a second circulation valve 221, and the second circulation port 202 is controlled by opening or closing the second circulation valve 221; the second circulation pipeline 220 is further provided with a water inlet pipeline 410 and a sampling pipeline 610, the water inlet pipeline 410 is connected with the water inlet unit 400, clear water is pumped into the reactor body 100 through the water inlet unit 400, the water inlet pipeline 410 is provided with a water inlet valve 411, the sampling pipeline 610 is provided with a sampling valve 611, and the water inlet and sampling operations are controlled by respectively controlling the opening and closing of the water inlet valve 411 and the sampling valve 611; and is
The inside of the reactor body 100 is provided with an MABR membrane 110, and the MABR membrane 110 is usually a hollow fiber curtain membrane, and the filling area of the MABR membrane 110 in the reactor body 100 is about 2-8m2(ii) a An air inlet main pipe 111 is arranged above the MABR membrane 110, one end of the air inlet main pipe 111 is connected with an air supply unit 300 through an air supply pipeline 310, and the air supply pipeline 310 is provided with a first regulating valve 311 for controlling air supply of the air inlet main pipe 111; in addition, a flow meter 312 is further arranged on the air supply pipeline 310 between the air supply unit 300 and the first regulating valve 311, and is used for monitoring the air supply flow in real time, realizing variable frequency control on the air supply unit 300 according to signal feedback and stabilizing the air supply flow;
an air outlet header 112 is arranged below the MABR membrane 110, one end of the air outlet header 112 is connected with an air exhaust pipeline 320, and a second regulating valve 321 is arranged on the air exhaust pipeline 320 and used for controlling the pressure in the MABR membrane 110; preferably, the second regulating valve 321 is an electric regulating valve, and a pressure sensor 322 is disposed on the exhaust pipe 320 between the outlet header 112 and the second regulating valve 321, and the degree of opening and closing of the second regulating valve 321 is regulated by a signal of the pressure sensor 322, so as to stably and accurately control the pressure in the membrane, typically, the pressure in the membrane is controlled in a range of 15-20 kPa.
In addition, a dissolved oxygen meter 120 may be disposed on the reactor body 100 for real-time monitoring of the change of the dissolved oxygen concentration of the water in the reactor body 100. Since the apparatus of the present invention includes the circulation unit 200 so that the water in the reactor body 100 is uniformly mixed, the dissolved oxygen meter 120 may be disposed at any position of the reactor body 100.
A method for testing the oxygen transfer performance of an MABR membrane by adopting the device for testing the oxygen transfer performance of the MABR membrane comprises the following steps:
s10, deoxidation: the first circulating valve 211 and the water inlet valve 411 are opened, water is pumped into the water inlet pipeline 410 through the water inlet unit 400 and then enters the second circulating pipeline 220, enters the first circulating pipeline 210 through the circulating unit 200, and is filled into the reactor body 100 from the first circulating port 201 from bottom to top until the whole reactor body 100 is filled;
then closing the water inlet valve 411, opening the feed valve 511, and adding a deoxidizer and a catalyst into the reactor body 100 through the feed pipe 510, wherein the deoxidizer is sodium sulfite, the added deoxidizer is usually excessive based on the amount of the water body dissolved oxygen in the reactor body 100, and preferably, the mass ratio of the water body dissolved oxygen in the reactor body 100 to the deoxidizer is 1: 7-1: 9; the catalyst is cobalt chloride, and the dosage is that the concentration of cobalt ions in the reactor body after the addition is about 0.05-0.5 mg/L;
closing the feed valve 511, opening the second circulation valve 221, uniformly mixing the water in the reactor body 100 with the deoxidizer and the catalyst through the circulation unit 200, performing a deoxidation reaction, and waiting for the indication number of the dissolved oxygen meter 120 to be 0, wherein the inside of the reactor body 100 realizes circulation from top to bottom, and the circulation flow is designed to be 300-;
s20, aeration: when the concentration of dissolved oxygen in the water in the reactor body 100 is 0, the sampling valve 611 is opened, the water in the reactor body 100 is sampled through the sampling pipe 610, the sampling volume is 2mL, and SO in the water sample is detected4 2-Concentration as initial SO in the aerated zero reactor body4 2-The concentration of the active ingredients in the mixture is,
then opening the gas supply unit 300, the first regulating valve 311 and the second regulating valve 321 respectively, supplying gas to the gas inlet main pipe 111 arranged above the MABR membrane 110, allowing the gas to enter the MABR membrane 110 through the gas inlet main pipe 111 to realize aeration of the MABR membrane to the reactor body 100, allowing the residual tail gas to enter the exhaust pipeline 320 through the gas outlet header 112 and exhaust out of the reactor, and controlling the gas supply flow and the pressure in the membrane during operation through the flow meter 312, the second regulating valve 321 and the pressure sensor 322 during aeration, wherein the pressure in the membrane is controlled to be 15-20kPa generally; reading the reading of the oxygen dissolving instrument 120 every 4-6min, preferably 5min, and sampling to detect the SO of the water body in the reactor body 1004 2-In a concentration ofStopping testing after aerating for 1-3h, preferably 2h or when the dissolved oxygen content in the water body does not rise any more, and closing all valves;
s30, calculating: respectively calculating the MABR membrane aeration oxygen total transfer coefficient Kla, the unit MABR membrane area oxygen transfer rate OTR and the MABR membrane oxygen transfer kinetic efficiency Ep according to the following formulas (1) to (3),
wherein:
t-t0: aeration time, min;
C0: the dissolved oxygen concentration in the aeration zero point reactor body is mg/L;
cs: saturated dissolved oxygen value at aeration temperature, mg/L;
ct: when the aeration time is t, the dissolved oxygen value in the reactor body is mg/L;
nt: when the aeration time is t, SO is in the reactor body4 2-Concentration, mg/L;
N0: SO in the zero point aeration reactor body4 2-Concentration, mg/L;
s: membrane area, m, of MABR membranes tested2；
V: effective volume of the reactor body, L;
p: power of the gas supply unit, kw.
Note that the calculated MABR membrane aeration oxygen total transfer coefficient Kla may be subjected to temperature correction as shown in the following formula (4):
Kla(20℃)＝Kla(T)·1.024T-20(4)
wherein: and T is the aeration temperature of the MABR membrane, and the corrected MABR membrane aeration oxygen total transfer coefficient Kla is obtained.
The invention carries out the MABR membrane oxygen transfer performance test by adopting the oxygen transfer performance test device which is suitable for the MABR special oxygen transfer aeration model, eliminates the errors of water depth, air contact and the like in the general oxygen transfer detection process, tests and calculates the oxidation-reduction reaction which continuously occurs by using excessive deoxidizer, realizes the accurate measurement and calculation of various performances of MABR membrane aeration under the same standard, and provides reliable theoretical basis for researching the oxygen transfer rule of the MABR membrane material and material development and design application.
Example 1
In the apparatus for testing the oxygen transfer performance of the MABR membrane of this embodiment, the specification (length ×, width ×, height) of the reactor body 100 is 30cm × 10cm × 1200cm, the MABR membrane 110 installed in the reactor body 100 is made of PTFE, the pore diameter is 0.5 μm, and the membrane area is 4m2Packing density of 111.11m2/m3。
In the process of performing the MABR membrane oxygen transfer performance test by using the apparatus of the present embodiment, the operating conditions of the oxygen transfer performance test are aeration amount: q is 1L/min; tail end discharge pressure (intra-membrane pressure): p ═ 20 kpa; adding amount of sodium sulfite: 3.5g (the mass ratio of the dissolved oxygen of the water body in the reactor body 100 to the deoxidizer is 1: 8); the addition amount of the catalyst cobalt chloride is as follows: 0.047 g.
After the test was started, the running and test data were recorded every 5min as in table 1 below.
TABLE 1 run and test data recorded during the test
Substituting the detection data into the formulas (1) to (3) to calculate the oxygen transmission parameter of the MABR membrane material made of the PTFE material as follows: kla-0.458 min-1；OTR＝0.0371g O2/(m2·min)；Ep＝2.54kg O2/kwh。
Comparative example 1
The basic contents of this comparative example are the same as example 1, except that: this comparative example was subjected to MABR membrane oxygen transfer performance testing using a conventional aeration disk testing method (CJ/T3015.2-1993) and apparatus.
The specific detection method comprises the following steps:
the chemical oxygen elimination method is that a certain amount of sulfurous acid steel is added into clear water, cobalt chloride is used as a catalyst, dissolved oxygen in the water is removed, aeration is started, analysis data is recorded, and the test is finished until the dissolved oxygen is saturated and meets the requirement that the dissolved oxygen amplification is less than 0.1mg/L within 20min of CJ/T3015.2-1993, or the dissolved oxygen basically keeps unchanged within 15 min. And processing data by adopting a linear and nonlinear regression method and comparing and analyzing the data.
The MABR membrane made of PTFE material is subjected to oxygen transfer test by the method, and the following oxygen transfer parameters are calculated: kla is 0.254min-1；OTR＝0.0182g O2/(m2·min)；Ep＝1.32kg O2/kwh。
Compared with the calculation result in example 1, the comparative example has lower oxygen transmission parameters calculated by adopting the testing device and the method of the traditional chemical aerobic method, and the difference between the two parameters is larger. The reason is analyzed, and the MABR membrane oxygen transfer performance testing device and method consider the conditions that the dissolved oxygen on the surface of the local membrane of the membrane is too high, the oxygen transfer concentration gradient is low and the MABR oxygen transfer capacity is blocked due to unsmooth water circulation in the bubble-free aeration process, so that the MABR membrane oxygen transfer performance is more accurately reflected by the MABR membrane oxygen transfer performance testing device and method.
Claims (10)
1. A device for testing oxygen transfer performance of an MABR membrane is characterized in that: the reactor comprises a reactor body (100), a circulating unit (200), an air supply unit (300) and a water inlet unit (400), wherein a first circulating port (201) is formed in the top of the reactor body (100), and the first circulating port (201) is connected with the circulating unit (200) through a first circulating pipeline (210); the bottom of the reactor body (100) is provided with a second circulation port (202), and the second circulation port (202) is connected with the circulation unit (200) through a second circulation pipeline (220); and is
An MABR membrane (110) is arranged in the reactor body (100), a main air inlet pipe (111) is arranged above the MABR membrane (110), one end of the main air inlet pipe (111) is connected with an air supply unit (300) through an air supply pipeline (310), an air outlet header (112) is arranged below the MABR membrane (110), and one end of the air outlet header (112) is connected with an air exhaust pipeline (320);
wherein, be provided with on above-mentioned first circulating line (210) and add feed pipe (510), be provided with inlet channel (410) and sample pipeline (610) on second circulating line (220), inlet channel (410) link to each other with water inlet unit (400).
2. The apparatus for testing oxygen transfer performance of MABR membrane according to claim 1, wherein: the reactor body (100) is provided with an oxygen dissolving instrument (120).
3. The apparatus for testing oxygen transfer performance of MABR membrane according to claim 1, wherein: a first circulation valve (211) is arranged on the first circulation pipeline (210), and a second circulation valve (221) is arranged on the second circulation pipeline (220).
4. The apparatus for testing oxygen transfer performance of MABR membrane according to claim 1, wherein: the gas supply pipeline (310) is provided with a first regulating valve (311), and the exhaust pipeline (320) is provided with a second regulating valve (321).
5. The apparatus for testing oxygen transfer performance of MABR membrane according to claim 1, wherein: the water inlet pipe (411) is arranged on the water inlet pipe (410), the feeding valve (511) is arranged on the feeding pipe (510), and the sampling valve (611) is arranged on the sampling pipe (610).
6. The apparatus of claim 4, wherein the apparatus for testing oxygen transmission performance of the MABR membrane comprises: a flow meter (312) is provided on the air supply duct (310) between the air supply unit (300) and the first regulating valve (311), and a pressure sensor (322) is provided on the exhaust duct (320) between the outlet header (112) and the second regulating valve (321).
7. The method for testing the oxygen transfer performance of the MABR membrane by using the device for testing the oxygen transfer performance of the MABR membrane according to any one of claims 1-6, wherein the device comprises the following steps: the method comprises the following steps:
s10, deoxidation: filling water into the whole reactor body (100), adding a deoxidizing agent and a catalyst into the reactor body (100), starting a circulating unit (200), and uniformly mixing the water in the reactor body (100) with the deoxidizing agent and the catalyst to perform a deoxidizing reaction;
s20, aeration: when the concentration of dissolved oxygen in water in the reactor body (100) is 0, sampling the water in the reactor body (100), and detecting SO in the water4 2-Concentration as initial SO in the aerated zero reactor body4 2-Then, the gas supply unit (300) is started to supply gas to the MABR membrane (110), the MABR membrane (110) is aerated to the reactor body (100), samples are taken every 4-6min, and the dissolved oxygen concentration and SO in the water in the reactor body (100) are detected4 2-Stopping testing when the concentration is 1-3h after aeration or the content of dissolved oxygen in the water body is not increased any more;
s30, calculating: respectively calculating the MABR membrane aeration oxygen total transfer coefficient Kla, the unit MABR membrane area oxygen transfer rate OTR and the MABR membrane oxygen transfer kinetic efficiency Ep according to the following formulas (1) to (3),
wherein:
t-t0: aeration time, min;
C0: the dissolved oxygen concentration in the aeration zero point reactor body is mg/L;
cs: saturated dissolved oxygen value at aeration temperature, mg/L;
ct: when the aeration time is t, the dissolved oxygen value in the reactor body is mg/L;
nt: when the aeration time is t, SO is in the reactor body4 2-Concentration, mg/L;
N0: SO in the zero point aeration reactor body4 2-Concentration, mg/L;
s: membrane area, m, of MABR membranes tested2；
V: effective volume of the reactor body, L;
p: power of the gas supply unit, kw.
8. The method for testing the oxygen transfer performance of the MABR membrane according to claim 7, wherein: in step S10, the mass ratio of dissolved oxygen in the water in the reactor body (100) to the added deoxidizer is 1: 7-1: 9.
9. the method for testing the oxygen transfer performance of the MABR membrane according to claim 7, wherein: in step S20, the gas supply unit (300) is turned on to supply gas to the MABR membrane (110), wherein the pressure inside the MABR membrane (110) is controlled to be 15-20 kPa.
10. The method for testing the oxygen transfer performance of the MABR membrane according to claim 7, wherein: in step S30, the MABR membrane aeration oxygen total transfer coefficient Kla is temperature-corrected by the following formula (4) to obtain a corrected MABR membrane aeration oxygen total transfer coefficient Kla,
Kla(20℃)＝Kla(T)·1.024T-20(4)
wherein: and T is the aeration temperature of the MABR membrane.
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