CN209906431U - River course aeration membrane subassembly and aeration membrane system - Google Patents
River course aeration membrane subassembly and aeration membrane system Download PDFInfo
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Abstract
The utility model discloses a river course aeration membrane subassembly and aeration membrane system belongs to the sewage treatment field. The aeration pipeline is communicated with one ends of a plurality of hollow membrane pipes; the other end of the hollow membrane tube is closed, the tube wall is provided with a plurality of air holes, and the microporous chemical fiber membrane filaments are connected around the air holes. The utility model discloses a cavity membrane pipe that is equipped with the gas pocket combines the micropore chemical fibre membrane silk that sets up around the gas pocket as the aeration subassembly, has improved the absorptive capacity of oxygen, makes the biomembrane update fast when increasing water dissolved oxygen volume, and the mud age is short, makes the membrane module have higher biological activity, can effectively promote the biofilm formation, and the biofilm formation time is short, effectively improves the treatment of sewage effect.
Description
Technical Field
The utility model belongs to the sewage treatment field, more specifically say, relate to a river course aeration membrane subassembly and aeration membrane system.
Background
Organic pollution is a main pollutant in municipal sewage, and currently, secondary biological treatment processes such as an activated sludge method and the like are commonly adopted in developed countries in the world to eliminate the pollution. Wherein, aeration is an important link of aerobic biological treatment, and has the functions of ensuring Dissolved Oxygen (DO) required by microorganism biochemistry, ensuring that the microorganism, a substrate and the DO in a reactor are fully mixed, and providing favorable biochemical reaction conditions for degrading organic matters by the microorganism. How to increase DO in water in cities with limited land on the premise of saving cost to improve the microbial treatment capacity becomes a serious problem in sewage treatment plants in China, and the problem can be effectively solved by adopting an aeration automatic control technology.
Pure oxygen aeration technology is introduced in the 80 th of the 20 th century and is used for treating petrochemical wastewater in China. Through the development in recent years, pure oxygen aeration is widely applied to riverway restoration and urban sewage treatment. Zhang Ming Xue et al (Zhang Ming Xue, Ma Zhi Liang, Luu Suzhou river water body oxygen consumption characteristic research and artificial aeration reoxygenation effect estimation [ J)]Shanghai environmental society, the discussion corpus of environmental science and technology for the new century, Shanghai: 1998.59-74.) the results of laboratory research and kinetic analysis on the artificial aeration reoxygenation effect of the Shanghai Suzhou river water body show that even if the river water with high black and odorous degree is in aerobic condition for 20 hours, the odor is basically eliminated, the water body color is obviously improved, and COD and BOD are greatly reduced (30% -55%). Study on improvement of bioreactor efficiency by oxygen-enriched aeration with membrane method]Environmental engineering journal, 2008 (2): 1069-1073.) the research on the oxygen-enriched aeration by the membrane method shows that the hydraulic retention time is shortened by about 1/3 compared with the air aeration, the COD removal rate is more than 95 percent, and NH is removed3the-N removal rate is more than 90%, and the oxygen-rich aeration can obviously improve the efficiency of the bioreactor.
Along with the continuous and deep research and practice of river treatment, a plurality of new processes appear at home and abroad, and the common point of the methods is the development towards the combined process. The combined process is a multifunctional process which is improved by combining two or more advantages. The demonstration engineering efficiency analysis of Wangjianhua, Wangwanhao, which rock, Huang-Ming, in-situ aeration repair of the endogenous nutrient salts of the bottom mud of the black and odorous river [ J ]. environmental engineering report, 2016,10(09): 5301-.
The prior art with the authorization notice number of CN 205740680U discloses a pretreatment device for black and odorous river sewage, which comprises an ecological enclosure collection aeration system, an artificial biological medium membrane system, an ecological macadam filtering system, a bio-base, an aeration head, an air stripping reflux circulation device, artificial medium fillers, macadam with large particle size and macadam with small particle size. The ecological barricade collection aeration system, the artificial biological medium membrane system and the ecological macadam filtering system are sequentially connected to form an artificial medium strengthening treatment area; the ecological barricade collection aeration system is filled with bio-based materials, and an aeration head is arranged on the bottom aeration hose; the artificial biological medium membrane system is filled with artificial medium filler, and the bottom of the artificial biological medium membrane system is provided with a gas stripping reflux circulation device; the gas stripping reflux circulation device is connected to the ecological enclosure collection aeration system; the ecological gravel filtering dam system is filled with gravel with large particle size and gravel with small particle size. Wherein the aeration system and the membrane system respectively adopt two systems to respectively play roles.
The prior art of publication number CN 106881023A discloses a prevent stifled high aeration efficiency's of silt hollow fiber curtain formula membrane subassembly, including hollow fiber membrane subassembly a plurality of, hollow membrane frame, antiwind silk screen and aeration subassembly, hollow fiber membrane subassembly includes hollow tube and hollow fiber membrane silk, the one end of hollow fiber membrane silk is stifled died, the other end and hollow tube intercommunication, install interior screwed joint on the hollow tube, the hollow tube passes through interior screwed joint and hollow membrane frame intercommunication, be equipped with the delivery port on the hollow membrane frame, the frame mounting is on the hollow membrane frame, antiwind silk screen mounting is on the frame, aeration subassembly installs in hollow membrane frame below. In the sewage treatment tank, sewage permeates through a filtering hole on the surface of a hollow fiber membrane wire blocked by one end through suction force, so that the filtered sewage is discharged through a water outlet on the hollow membrane frame; the hollow fiber membrane yarn is mainly used for enabling sewage to enter the hollow fiber membrane yarn from the outside of the hollow fiber membrane yarn through the surface filtering holes and then to be discharged; the water body is very easy to block in the filtering mode environment, and an additional aeration system is still needed for aeration.
The hollow fiber membrane component selected by Suzhongyan and the like (Suzhongyan. experimental research on aeration reoxygenation of hollow fiber membranes to improve river water quality [ D ]. Hebei engineering university, 2009.) is a polypropylene (PP) hydrophobic membrane, and the experimental water inflow rate is 40L/h; selecting a circulating pump for stirring, applying hollow fiber membrane aeration reoxygenation, continuously operating for 28d, and respectively aerating for 14 days by taking air (Q is 40mL/min) as an air source and pure oxygen (Q is 8mL/min) as an air source for 14 days during the period; in the first 14d, the average removal rate of COD was 14.56%, and the average removal rate of SS was 23.24%, and in the second 14d, the average removal rate of COD was 20.77%, and the average removal rate of SS was 28.54%.
Based on the high content of total nitrogen, ammonia nitrogen and COD in the river course water, quality of water is relatively poor (mostly bad V type) water, appears black smelly problem even, above-mentioned prior art has realized the purpose of aeration to a certain extent, but how to realize the high-efficient target oxygen suppliment of heavily polluting the water, improves aeration efficiency, reduces the energy consumption, still is the technological problem who awaits the solution urgently in the river course sewage treatment field.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that the DO content of the existing black and odorous water body of the river channel is too low, the utility model provides a river channel aeration membrane component, an aeration membrane system and a method, which realize the high-efficiency targeted oxygen supply of the heavily polluted water body and adjust the DO content of the water body, and the aeration membrane can also directionally construct a river channel microbial community structure and a microbial habitat while improving the mass transfer effect, thereby improving the self-cleaning capability of the river channel; and further, the online monitoring and intelligent control are realized through an intelligent control system, the energy consumption is saved, and the long-term improvement effect of the water quality is ensured.
2. Technical scheme
In order to solve the above problem, the utility model discloses the technical scheme who adopts as follows:
a river aeration membrane component comprises an aeration pipeline and a hollow braid biological membrane, wherein the hollow braid biological membrane comprises hollow membrane tubes and microporous chemical fiber membrane wires, and the aeration pipeline is communicated with one ends of a plurality of hollow membrane tubes; the other end of the hollow membrane tube is closed, the tube wall is provided with a plurality of air holes, and the microporous chemical fiber membrane filaments are connected around the air holes. The hollow membrane tube with the air holes is used as an aeration component, so that air escapes from the air holes to the water body under the action of pressure after entering the hollow membrane tube through an aeration pipeline, and the retention time of escaped nanoscale gas is prolonged by combining microporous chemical fiber membrane wires arranged around the air holes, the contact surface area of the escaped nanoscale gas and the gas-liquid is increased, the absorption capacity of oxygen is improved, and the dissolved oxygen content of the water body is increased; meanwhile, the air holes are extremely small, the aeration intensity is increased, the disturbance of air and water flow is severe, the scouring on the surface of the biological membrane is enhanced, the biological membrane is updated quickly, the sludge age is short, and the membrane component has higher biological activity, namely the structure can effectively promote the membrane hanging.
Preferably, the closed end of the hollow membrane tube is a free end. The closed end adopts a non-fixed mode, so that the membrane module floats in the river channel.
Preferably, the hollow braid biofilms are arranged in rows on the aeration line.
Preferably, the hollow braid biological membranes are in at least one row.
Preferably, the hollow membrane tube is made of reinforced polyvinylidene fluoride or polypropylene. The membrane tube made of the material has the advantages of good chemical stability, acid and alkali resistance, bacterial corrosion resistance and better oxidation resistance. The material of MBR hollow membrane pipe all can be used for this scheme.
Preferably, the hollow membrane tube is connected with the aeration line through a methyl methacrylate adhesive or epoxy resin.
Preferably, the inner diameter of the hollow membrane tube is 0.4mm, and the outer diameter is 1.45 mm; the diameter of the pores is 0.01 to 0.1 μm.
Preferably, the fineness of the microporous chemical fiber membrane yarn is 0.001-0.1D, and the length of the microporous chemical fiber membrane yarn is 5-10 mm. When the microporous chemical fiber membrane yarn with the fineness is used, microorganisms are more easily attached, and the membrane assembly is quicker to start and hang membrane due to the large specific surface area, the COD removal rate and the ammonia nitrogen removal rate are higher, and the system has strong water quality impact load resistance; meanwhile, the gas from the air holes of the hollow membrane tube is blocked and scattered by the microporous chemical fiber membrane filaments with large specific surface area, the micro-nano air has long water cut-off time and high aeration efficiency, the retention time of the air in the water body is further prolonged, the dissolved oxygen in the water body is increased, the utilization rate of oxygen is increased, the area of the aeration membrane per unit volume is large, and the energy consumption is low; the microporous chemical fiber membrane filaments have high arrangement density, microorganisms are highly enriched on the surface of the membrane, and active microorganisms are not easy to lose.
Preferably, the microporous chemical fiber membrane filaments are connected with the hollow membrane tube through epoxy resin. The hollow braid biological membrane formed by the method has long service life, no pollution problem and no operations such as back flushing and the like.
Preferably, the specific surface area of the hollow braid biological membrane is 7000-7500 m2/m3. The void ratio of the hollow braid biological membrane is 40-50%. The high specific surface area and the high porosity of the hollow braid biological membrane are combined with the three-dimensional structure of the biological membrane, so that waste water conveniently enters the hollow braid biological membrane to carry out biological contact oxidation reaction, and meanwhile, the normally-fallen biological membrane easily flows out along with water, so that the occurrence probability of blockage is reduced.
A river aeration membrane system comprises the aeration membrane component, a gas pipeline, a blower and an intelligent control system, wherein the intelligent control system comprises a dissolved oxygen detector; the intelligent control system is connected with a blower and a dissolved oxygen detector, and the blower is connected with the aeration membrane component through a gas pipeline. When the oxygen in the water body is insufficient or exceeds the standard, the oxygen is fed back to the control system in real time, the DO content is regulated, the online monitoring and intelligent control can be realized, and the energy consumption is saved.
A method for treating black and odorous water in a river by adopting the aeration membrane system comprises the following steps:
1) placing an aeration membrane system at a specific height of a river water body, and arranging aeration membrane assemblies in parallel at equal intervals;
2) at aeration pressure P1The water pressure P of the position where the aeration pipeline is positioned2The difference satisfies that P is more than or equal to 10kPa1-P2Aerating at a pressure of less than or equal to 30kPa, starting film formation: air enters the hollow membrane tube along the aeration pipeline and is discharged from the air holes on the hollow membrane tube, and dissolved oxygen is dispersed to a water body through the microporous chemical fiber membrane filaments;
3) aerating until the dissolved oxygen in the water body is saturated, feeding back the dissolved oxygen detector to the control system in real time to suspend aeration, and feeding back the dissolved oxygen detector to the control system in real time to carry out aeration when the dissolved oxygen in the water body is lower than a set value;
4) and after the membrane hanging is finished, the aeration membrane system treats the sewage.
Aeration pressure P1When the size is too large, large bubbles are formed to reduce the dissolved oxygen amount; aeration pressure P1When the temperature is too low, the gas escape rate is too slow, so that the dissolved oxygen in the water body is low.
Preferably, the ammonia nitrogen reduction load of the aeration membrane system arranged in the step 1) is 0.4-2.0 g/m2D; when the ammonia nitrogen concentration of the raw water is less than 5.0mg/L, the load reduction value is 0.4-0.8 g/m2D; when the ammonia nitrogen concentration of the raw water is 5.0-10.0 mg/L, the load is reduced by 0.8-1.2 g/m2D; when the ammonia nitrogen concentration of the raw water is 10.0-20.0 mg/L, the load is reduced by 1.2-1.6 g/m2D; when the ammonia nitrogen concentration of the raw water is more than 20.0mg/L, the load reduction value is 1.6-2.0 g/m2·d。
Preferably, the COD load reduction of the aeration membrane system arranged in the step 1) is 4.0-20.0 g/m2D; COD of raw watercrWhen the concentration is 30.0-50.0 mg/L, the load reduction value is 4.0-8.0 g/m2D; COD of raw watercrWhen the concentration is 50.0-150.0 mg/L, the load reduction value is 8.0-15.0 g/m2D; COD of raw watercrWhen the concentration is more than 150.0mg/L, the load reduction value is 15.0-20.0 g/m2·d。
3. Advantageous effects
Compared with the prior art, the beneficial effects of the utility model are that:
(1) compared with the prior art, the utility model, with the hollow membrane pipe that is used for filtering sewage among the prior art and is equipped with the gas pocket as aeration equipment, the aeration membrane that forms not only is favorable to forming nanometer gas in the water, improves the water dissolved oxygen, moreover because the big specific surface area of micropore chemical fiber membrane silk provides huge space for the biological perching, makes a large amount of microorganisms can adhere to and grow, therefore can maintain the biomass of higher concentration, can enrich the microbial membrane, effectively promote and hang the membrane; the gas is dispersed in time by combining the microporous chemical fiber membrane yarns arranged around the air holes of the membrane, the dissolved oxygen in the water body is further improved, the formed hollow braid biological membrane becomes a carrier for providing high dissolved oxygen for microorganisms in water, a river microbial community structure and a microbial habitat can be directionally constructed while the mass transfer effect is improved, the rapid degradation of pollutants is facilitated by combining the characteristics of the membrane, and the self-cleaning capability of the river is improved; meanwhile, the hollow membrane tube is adopted to aerate from inside to outside, so that the blocking phenomenon in the prior art when the hollow membrane tube filters sewage can be effectively avoided.
(2) Compared with the traditional aeration mode, the hollow fiber membrane aeration has the following characteristics: firstly, no air bubble is generated during aeration, so that the pollution to the environment caused by the fact that volatile substances such as toluene and phenol in the sewage enter the atmosphere along with the air bubble during the traditional aeration is avoided; meanwhile, the foaming caused by the existence of the surfactant is avoided; secondly, air bubbles are not generated during aeration, oxygen directly diffuses into a water body in a molecular state, and the oxygen is easily absorbed, so that the mass transfer efficiency is greatly improved, the requirement of high oxygen demand of certain wastewater can be met, and the supply of the oxygen can be controlled by adjusting the pressure of the gas; thirdly, gas-liquid two-phase separation inside and outside the reactor is not easy to block;
(3) the air release aperture of the hollow membrane tube of the utility model is 0.01-0.1 μm, while the air release aperture of the traditional aeration device is 1-5 mm, under the pressure in the embodiment 1, the water dissolved oxygen amount reaches saturation 10min after starting, and the water dissolved oxygen amount reaches saturation only after starting and starting 180min in the comparative example C, by adopting the scheme of the utility model, the aeration energy consumption is effectively reduced;
(4) because the closed end of the hollow braid biomembrane hollow membrane tube is a free end, the hollow braid biomembrane can float on the river surface, does not need civil engineering pond body construction, can be flexibly adjusted according to water quality conditions, and has the characteristics of good river water body purification effect, stable operation, small occupied area, low manufacturing cost, low operation cost, flexible arrangement and contribution to establishment and perfection of ecological restoration capacity of the river water body.
(5) The utility model has the advantages of less investment in comprehensive engineering, low power consumption and low operation cost; the operation is simple, and the process is automatically controlled; the device is compact, occupies small space and is easy to maintain.
Drawings
FIG. 1 is a schematic view of an aeration membrane system according to the present invention;
FIG. 2 is a schematic structural view of the aeration membrane module of the present invention;
in the figure: 1. an aeration line; 2. a hollow membrane tube; 3. microporous fibrous membrane filaments.
Detailed Description
The utility model discloses an aeration membrane subassembly is as normal position biomembrane river course water ecological purification system, and it receives the influence of changing in season less, can not die like natural aquatic plant and rot, can eliminate river course quality of water phenomenon of worsening, can purify river course quality of water for a long time, reduces suspended solid content, improves water transparency, increases dissolved oxygen, improves river course water ecological environment. Meanwhile, the river water body ecological purification system formed by the in-situ biological membrane assemblies can be sequentially arranged under the water surface of the river according to the structural characteristics, the water flow characteristics and the water quality characteristics of the river. The microorganism takes an in-situ biological membrane hollow fiber membrane and a microporous chemical fiber membrane yarn as carriers, and simultaneously propagates in large quantities by means of organic suspended matters or soluble nutrients in the water body to form a biological membrane capable of absorbing and decomposing pollutants, so that the water body of the river channel is continuously and effectively purified, and the biological membrane plays a positive and effective promoting role in improving and restoring the water body ecosystem.
As shown in fig. 1, the aeration membrane system comprises a membrane module, a gas pipeline, a blower and an intelligent control system, wherein the intelligent control system comprises a dissolved oxygen detector; intelligent control systemThe air blower is connected with the dissolved oxygen detector and the aeration membrane component through a gas pipeline. As shown in fig. 2, the membrane module comprises an aeration line and a hollow braid biological membrane, the hollow braid biological membrane comprises hollow membrane tubes and microporous chemical fiber membrane filaments, and the aeration line is communicated with one ends of the hollow membrane tubes; the other end of the hollow membrane tube is closed, the tube wall is provided with a plurality of air holes, the microporous chemical fiber membrane filaments are connected around the air holes, the closed end of the hollow membrane tube is a free end, and the formed membrane assembly is in a curtain shape; the hollow braid biological membranes are arranged on the aeration pipeline in rows, and 1-4 rows of hollow braid biological membranes are distributed on each membrane module; the hollow membrane tube is made of reinforced PVDF and is connected with the aeration pipeline through methyl methacrylate adhesive; the inner diameter of the hollow membrane tube is 0.4mm, and the outer diameter is 1.45 mm; the diameter of the air hole is 0.01-0.1 μm, the fineness of the microporous chemical fiber membrane silk material is 0.01-0.1D, and the length is 5 mm; the microporous chemical fiber membrane filaments are connected with the hollow membrane tube through a methyl methacrylate adhesive; the specific surface area of the hollow braid biological membrane is 7000-7500 m2/m3The porosity is 40-50%.
Firstly, the technical parameters of the membrane module are as follows:
the material is as follows: modified polymer composite material: reinforced PVDF
The external dimension is as follows: length multiplied by width multiplied by 2150mm multiplied by 1000mm
Effective length of the membrane: 2000mm
Number of rows of hollow braid biological membranes: 2 rows of
Surface area: 4m2Tablet/tablet
Reducing the load of ammonia nitrogen: 0.4 to 2.0g/m2D; when the ammonia nitrogen concentration of the raw water is less than 5.0mg/L, the load reduction value is 0.4-0.8 g/m2D; when the ammonia nitrogen concentration of the raw water is 5.0-10.0 mg/L, the load is reduced by 0.8-1.2 g/m2D; when the ammonia nitrogen concentration of the raw water is 10.0-20.0 mg/L, the load is reduced by 1.2-1.6 g/m2D; when the ammonia nitrogen concentration of the raw water is more than 20.0mg/L, the load reduction value is 1.6-2.0 g/m2·d；
COD load reduction: 4.0 to 20.0g/m2D; COD of raw watercrWhen the concentration is 30.0-50.0 mg/L, the load reduction value is 4.0-8.0 g/m2D; COD of raw watercrAt a concentration of 50.0-150.0 mg/LThe reduced load value is 8.0-15.0 g/m2D; COD of raw watercrWhen the concentration is more than 150.0mg/L, the load reduction value is 15.0-20.0 g/m2·d。
Second, operating conditions
Operating pressure: less than or equal to 100kpa
The applicable temperature is as follows: -10 to 45 DEG C
The applicable pH value is as follows: 2 to 13
The applicable water depth is as follows: not less than 0.8m
The gas pipeline of the aeration membrane system adopts a common carbon steel welded steel pipe and a UPVC pipeline; the cables of the power supply and intelligent control system of the device are directly buried or buried sand, all buried pipelines are externally anti-corrosive by epoxy coal tar pitch, and anti-corrosion is realized by adopting a three-oil two-cloth mode; the non-buried pipeline is brushed with a primer and is antiseptic with alkyd enamel.
The present invention will be further described with reference to the following specific embodiments.
Example 1
Taking a certain project needing oxygen increasing and aeration as an example: selecting a black and odorous section of a river as an engineering place, wherein the length of the river is 2500 meters, the average width of the river is 27 meters, and the COD in the water body of the rivercrThe concentration is 25-31 mg/L; the ammonia nitrogen concentration is 16-25 mg/L; selecting 1-5 parts along the river course as sampling points, detecting the transparency, ORP, DO, COD concentration and ammonia nitrogen concentration, and arranging an aeration membrane system at a water depth of 2m (the water temperature is 25 ℃).
Each membrane module is distributed with 2 rows of braid biological membranes; the hollow membrane tube is made of reinforced lining PVDF material and is connected with an aeration pipeline through methyl methacrylate; the inner diameter of the hollow membrane tube is 0.4mm, and the outer diameter is 1.45 mm; the diameter of the air hole is 0.01-0.1 μm; the fineness of the microporous chemical fiber membrane yarn is 0.01-0.1D, and the length of the microporous chemical fiber membrane yarn is 5-10 mm; the microporous chemical fiber membrane filaments are connected with the hollow membrane tube through epoxy glue; the specific surface area of the hollow braid biological membrane is 7000-7500 m2/m3The porosity is 40-50%, and the film forming weight is 120-150 kg/m3。
The average distance between the intelligent aeration membrane components is 20 meters, and the value of the ammonia nitrogen reduction load is 2.0g/m2D, COD load shedding value of 20.0g/m2D; the membrane module is directly placed in the river channel according to the width of the river channel, the civil engineering pond body construction is not needed, and the membrane module can be flexibly adjusted according to the water quality condition.
At aeration pressure P1The water pressure P of the position where the aeration pipeline is positioned2Satisfy P1-P2Aerating at 10kPa, and starting film formation; air enters the hollow membrane tube along the aeration pipeline and is discharged from the air holes on the hollow membrane tube, and dissolved oxygen is dispersed to a water body through the microporous chemical fiber membrane filaments; aerating until the dissolved oxygen in the water body is saturated, feeding back the dissolved oxygen detector to the control system in real time to suspend aeration, and feeding back the dissolved oxygen detector to the control system in real time to carry out aeration when the dissolved oxygen in the water body is lower than 50% of the saturated dissolved oxygen; the biofilm formation time is about 180 hours, and after the biofilm formation is finished, the aeration membrane system treats the sewage. After the operation is carried out for 60 days, the COD concentration in the water body is reduced to 13.8-15.8 mg/L; the ammonia nitrogen concentration is 6.32-7.38 mg/L, the water transparency is improved to 25-33 cm from 13-17 cm before treatment, the DO is improved to 2.3-2.8 mg/L from 1.1-1.7 mg/L before treatment, and the indexes before and after treatment are shown in Table 1.
TABLE 1 before and after treatment index of example 1
Comparative example A
The black odorous water in different sections of the same riverway as in the embodiment 1 is treated by the following steps basically as in the embodiment 1, except that: the hollow membrane tube is not provided with the microporous chemical fiber membrane yarn, only has air holes, and is utilized for aeration.
The biofilm formation time is about 240 hours, and after the biofilm formation is finished, the aeration membrane system treats the sewage. After running for 60 days, the average COD concentration in the water body is 19.3 mg/L; the average concentration of ammonia nitrogen is 10.6 mg/L.
Comparative example B
The black odorous water in different sections of the same riverway as in the embodiment 1 is treated by the following steps basically as in the embodiment 1, except that: aeration was assisted by conventional braided packing, not the hollow braided biofilm of example 1.
The biofilm formation time is about 300h, and after the biofilm formation is finished, the aeration membrane system treats the sewage. After running for 60 days, the COD concentration in the water body is 17.4 mg/L; the ammonia nitrogen concentration is 10.4 mg/L.
Comparative example C
The black odorous water in different sections of the same riverway as in the embodiment 1 is treated by the following steps basically as in the embodiment 1, except that: aeration was carried out using a conventional apparatus with an air release aperture of 1 mm.
The data for example 1 and comparative examples A-C are shown in Table 2.
TABLE 2 comparison of experimental data for example 1 and comparative examples A-C
As can be seen from Table 2, compared with comparative examples A-C, the dissolved oxygen saturation time of example 1 is obviously shortened, compared with comparative examples A and B, the biofilm formation time is shortened to 180 hours under the condition of the same aeration pressure, and the gas-water ratio is improved to 1:5 from 10:1 of the traditional aeration device in comparative example C, so that the air utilization rate and the mass transfer efficiency are effectively improved; the ammonia nitrogen reduction rate of the aeration membrane system in the embodiment 1 after running for 60 days reaches 65.7 percent, which is far higher than that of the aeration membrane systems in the comparative examples A and B.
Example 2
Selecting a black and odorous section of a river channel as an engineering place, wherein the river channel is 1200 meters long and 15 meters wide, and the ammonia nitrogen concentration in the river channel water body is 18.5 mg/L; selecting one position along the river course as a sampling point, detecting the transparency, ORP, DO and ammonia nitrogen concentration of the sampling point, and arranging an aeration membrane system at a water depth of 2m (the water temperature is 25 ℃).
Each membrane module is distributed with 2 rows of braid biological membranes; the hollow membrane tube is made of reinforced lining PVDF material and is connected with an aeration pipeline through methyl methacrylate; the inner diameter of the hollow membrane tube is 0.4mm, and the outer diameter is 1.45 mm; the diameter of the air hole is 0.01-0.1 μm; the fineness of the microporous chemical fiber membrane yarn is 0.01-0.1D, and the length of the microporous chemical fiber membrane yarn is 5-10 mm; the microporous chemical fiber membrane filaments are connected with the hollow membrane tube through epoxy glue; the specific surface area of the hollow braid biological membrane is 7000-7500 m2/m3The porosity is 40-50%, and the film forming weight is 120-150 kg/m3。
The average distance between the intelligent aeration membrane components is 15 meters, and the value of the ammonia nitrogen reduction load is 1.5g/m2D; the membrane module is directly placed in the river channel according to the width of the river channel, the civil engineering pond body construction is not needed, and the membrane module can be flexibly adjusted according to the water quality condition.
At aeration pressure P1The water pressure P of the position where the aeration pipeline is positioned2Satisfy P1-P2Aerating at 20kPa, and starting film formation; air enters the hollow membrane tube along the aeration pipeline and is discharged from the air holes on the hollow membrane tube, and dissolved oxygen is dispersed to a water body through the microporous chemical fiber membrane filaments; aerating until the dissolved oxygen in the water body is saturated, feeding back the dissolved oxygen detector to the control system in real time to suspend aeration, and feeding back the dissolved oxygen detector to the control system in real time to carry out aeration when the dissolved oxygen in the water body is lower than 80% of the saturated dissolved oxygen; the biofilm formation time is about 192 hours, and after the biofilm formation is finished, the sewage is treated by the aeration membrane system. After the operation is carried out for 60 days, the ammonia nitrogen concentration in the water body is 1.5mg/L, the transparency of the water body is improved to 32cm from 8cm before treatment, the DO is improved to 3.7mg/L after treatment from 0.9mg/L before treatment, and indexes before and after treatment are shown in a table 3.
TABLE 3 before and after treatment indexes of example 2
Example 3
Selecting a black and odorous section of a river channel as an engineering site, wherein the length of the river channel is 1160 meters, the width of the river channel is 13-18 meters, and the concentration of ammonia nitrogen in a river channel water body is 20.5 mg/L; selecting one position along the river course as a sampling point, detecting the transparency, ORP, DO and ammonia nitrogen concentration of the sampling point, and arranging an aeration membrane system at a water depth of 1m (the water temperature is 25 ℃).
Each membrane module is distributed with 2 rows of braid biological membranes; the hollow membrane tube is made of reinforced lining PVDF material and is connected with an aeration pipeline through methyl methacrylate; the inner diameter of the hollow membrane tube is 0.4mm, and the outer diameter is 1.45 mm; the diameter of the air hole is 0.01-0.1 μm; the fineness of the microporous chemical fiber membrane yarn is 0.01-0.1D, and the length of the microporous chemical fiber membrane yarn is 5-10 mm; the microporous chemical fiber membrane filaments are connected with the hollow membrane tube through epoxy glue; inThe specific surface area of the braid biological membrane is 7000-7500 m2/m3The porosity is 40-50%, and the film forming weight is 120-150 kg/m3。
The average distance between the intelligent aeration membrane components is 10 meters, and the value of the ammonia nitrogen reduction load is 1.6g/m2D; the membrane module is directly placed in the river channel according to the width of the river channel, the civil engineering pond body construction is not needed, and the membrane module can be flexibly adjusted according to the water quality condition.
At aeration pressure P1The water pressure P of the position where the aeration pipeline is positioned2Satisfy P1-P2Aerating at 20kPa, and starting film formation; air enters the hollow membrane tube along the aeration pipeline and is discharged from the air holes on the hollow membrane tube, and dissolved oxygen is dispersed to a water body through the microporous chemical fiber membrane filaments; aerating until the dissolved oxygen in the water body is saturated, feeding back the dissolved oxygen detector to the control system in real time to suspend aeration, and feeding back the dissolved oxygen detector to the control system in real time to carry out aeration when the dissolved oxygen in the water body is lower than 90% of the saturated dissolved oxygen; the biofilm formation time is about 168 hours, and after the biofilm formation is finished, the aeration membrane system treats the sewage. After the operation is carried out for 60 days, the ammonia nitrogen concentration in the water body is 1.5mg/L, the transparency of the water body is improved to 30cm from 7cm before treatment, the DO is improved to 3.0mg/L after treatment from 0.7mg/L before treatment, and indexes before and after treatment are shown in a table 4.
TABLE 4 before and after treatment index in example 3
Example 4
Selecting a black and odorous section of a river channel as an engineering site, wherein the length of the river channel is 1127 meters, the width of the river channel is about 18-20 meters, and the concentration of ammonia nitrogen in a river channel water body is 13.5 mg/L; selecting one position along the river course as a sampling point, detecting the transparency, ORP, DO and ammonia nitrogen concentration of the sampling point, and arranging an aeration membrane system at a 4m water depth position (the water temperature is 25 ℃).
Each membrane module is distributed with 2 rows of braid biological membranes; the hollow membrane tube is made of reinforced lining PVDF material and is connected with an aeration pipeline through methyl methacrylate; the inner diameter of the hollow membrane tube is 0.4mm, and the outer diameter is 1.45 mm; pore diameter of0.01 to 0.1 μm; the fineness of the microporous chemical fiber membrane yarn is 0.01-0.1D, and the length of the microporous chemical fiber membrane yarn is 5-10 mm; the microporous chemical fiber membrane filaments are connected with the hollow membrane tube through epoxy glue; the specific surface area of the hollow braid biological membrane is 7000-7500 m2/m3The porosity is 40-50%, and the film forming weight is 120-150 kg/m3。
The average distance between the intelligent aeration membrane components is 10 meters, and the value of the ammonia nitrogen reduction load is 1.2g/m2D; the membrane module is directly placed in the river channel according to the width of the river channel, the civil engineering pond body construction is not needed, and the membrane module can be flexibly adjusted according to the water quality condition.
At aeration pressure P1The water pressure P of the position where the aeration pipeline is positioned2Satisfy P1-P2Aerating at 30kPa, and starting film formation; air enters the hollow membrane tube along the aeration pipeline and is discharged from the air holes on the hollow membrane tube, and dissolved oxygen is dispersed to a water body through the microporous chemical fiber membrane filaments; aerating until the dissolved oxygen in the water body is saturated, feeding back the dissolved oxygen detector to the control system in real time to suspend aeration, and feeding back the dissolved oxygen detector to the control system in real time to carry out aeration when the dissolved oxygen in the water body is lower than 60% of the saturated dissolved oxygen; the biofilm formation time is about 200h, and after the biofilm formation is finished, the aeration membrane system treats the sewage. After the operation is carried out for 60 days, the ammonia nitrogen concentration in the water body is 1.8mg/L, the transparency of the water body is improved to 30cm from 15cm before treatment, the DO is improved to 3.3mg/L after treatment from 1.3mg/L before treatment, and indexes before and after treatment are shown in a table 5.
TABLE 5 before and after treatment index in example 4
Claims (7)
1. A river aeration membrane component is characterized by comprising an aeration pipeline and a hollow braid biological membrane, wherein the hollow braid biological membrane comprises hollow membrane tubes and microporous chemical fiber membrane wires, and the aeration pipeline is communicated with one ends of a plurality of hollow membrane tubes; the other end of the hollow membrane tube is closed, the tube wall is provided with a plurality of air holes, and the microporous chemical fiber membrane filaments are connected around the air holes.
2. The river aeration membrane assembly of claim 1, wherein the closed end of the hollow membrane tube is a free end.
3. The river aeration membrane assembly of claim 1, wherein the hollow membrane tube is made of reinforced polyvinylidene fluoride or polypropylene.
4. The river aeration membrane assembly of claim 1, wherein the hollow membrane tube has an inner diameter of 0.4mm and an outer diameter of 1.45 mm; the diameter of the pores is 0.01 to 0.1 μm.
5. The river aeration membrane assembly of claim 1, wherein the microporous chemical fiber membrane filaments have a fineness of 0.001-0.1D and a length of 5-10 mm.
6. The river aeration membrane assembly of claim 1, wherein the specific surface area of the hollow braid biological membrane is 7000-7500 m2/m3。
7. An aeration membrane system, which is characterized by comprising the aeration membrane component as claimed in any one of claims 1 to 6, and further comprising a gas pipeline, a blower and an intelligent control system, wherein the intelligent control system comprises a dissolved oxygen detector; the intelligent control system is connected with a blower and a dissolved oxygen detector, and the blower is connected with the aeration membrane component through a gas pipeline.
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| CN109928488B (en) * | 2019-04-17 | 2024-02-06 | 安徽创杰环境科技有限公司 | River aeration membrane assembly, aeration membrane system and method |
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