CN114644393A - Sewage COD purification device and purification method - Google Patents
Sewage COD purification device and purification method Download PDFInfo
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- CN114644393A CN114644393A CN202210165110.8A CN202210165110A CN114644393A CN 114644393 A CN114644393 A CN 114644393A CN 202210165110 A CN202210165110 A CN 202210165110A CN 114644393 A CN114644393 A CN 114644393A
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- sewage cod
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- 239000010865 sewage Substances 0.000 title claims abstract description 115
- 238000000746 purification Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000945 filler Substances 0.000 claims abstract description 98
- 238000005273 aeration Methods 0.000 claims abstract description 39
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000001301 oxygen Substances 0.000 claims abstract description 20
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 20
- 239000010802 sludge Substances 0.000 claims description 29
- 244000005700 microbiome Species 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000011259 mixed solution Substances 0.000 claims description 12
- 241000894006 Bacteria Species 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 8
- 230000014759 maintenance of location Effects 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- 241001148470 aerobic bacillus Species 0.000 claims description 4
- 230000000593 degrading effect Effects 0.000 claims description 4
- 241001148471 unidentified anaerobic bacterium Species 0.000 claims description 4
- 230000032770 biofilm formation Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 19
- 239000012535 impurity Substances 0.000 abstract description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 6
- 238000006731 degradation reaction Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000007888 film coating Substances 0.000 description 4
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- 208000012868 Overgrowth Diseases 0.000 description 2
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- 241001052560 Thallis Species 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 241000238876 Acari Species 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 241000223785 Paramecium Species 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 125000002091 cationic group Chemical group 0.000 description 1
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Images
Classifications
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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
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
- C02F3/108—Immobilising gels, polymers or the like
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/44—Time
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/20—Prevention of biofouling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention provides a sewage COD purification device and a purification method, wherein the sewage COD purification device comprises a tank body and a fan, an aeration device, a first sieve plate and a second sieve plate are arranged in the tank body, the aeration device is connected with the fan, the first sieve plate and the second sieve plate are positioned above the aeration device, and a biological filler is arranged between the first sieve plate and the second sieve plate, wherein the first sieve plate is fixedly arranged in the tank body, the second sieve plate is movably arranged above the first sieve plate, and the second sieve plate is suitable for reciprocating in the vertical direction so as to extrude the biological filler. The biological filler can be fully mixed with sewage, so that the contact area of the sewage and the biological filler is increased, the sewage treatment efficiency is improved, and the biological filler is collided and sheared in the sewage, so that the utilization rate of oxygen is improved; and the second sieve plate can move up and down to extrude the biological filler, so that impurities on the biological filler are removed, and the stable treatment effect is ensured.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage COD purification device and a purification method.
Background
COD (chemical Oxygen demand) is the chemical Oxygen demand, and the amount of reducing substances to be oxidized in a water sample is measured by a chemical method. COD in the sewage is an important organic matter pollution parameter which can be measured quickly, and the COD in the sewage after treatment must reach the discharge standard. In the prior art, in order to reduce COD in sewage, an activated sludge method is generally adopted for treatment, organic matters in the sewage are degraded through microorganisms in the activated sludge, but the treatment efficiency of the activated sludge method is lower, the treatment time is long, and the activated sludge is easily influenced by sewage impurities and sewage scouring, so that the sludge is expanded and lost, and the treatment effect of the sewage is influenced.
Disclosure of Invention
The invention solves the problems of low sewage treatment efficiency, sludge expansion and sludge loss in the prior art.
In order to solve at least one of the above problems, the present invention provides a sewage COD purification apparatus, comprising a tank and a fan, wherein an aeration device, a first sieve plate and a second sieve plate are arranged in the tank, the aeration device is connected to the fan, the first sieve plate and the second sieve plate are located above the aeration device, and a biological filler is arranged between the first sieve plate and the second sieve plate, wherein the first sieve plate is fixedly arranged in the tank, the second sieve plate is movably arranged above the first sieve plate, and the second sieve plate is adapted to reciprocate in an up-down direction to extrude the biological filler.
Preferably, a plurality of screw rods are movably arranged on the first sieve plate along the vertical direction, corresponding screw holes are correspondingly arranged on the second sieve plate, the screw rods penetrate through the screw holes, and when the screw rods rotate, the second sieve plate is suitable for moving up and down along the screw rods.
Preferably, the sewage COD purifier still includes the motor, be provided with first gear on the motor shaft of motor, be provided with on the screw rod with the second gear of first gear meshing, the motor is suitable for to drive the screw rod is rotatory.
Preferably, a stirrer is further arranged in the tank body and is positioned at the bottom of the tank body.
Preferably, the bio-filler is a polyurethane modified bio-compatible filler.
Preferably, the filling rate of the biological filler is 5% -88%.
Preferably, the biological filler is subjected to pre-film coating treatment, anaerobic bacteria and/or facultative bacteria are loaded inside the biological filler, and aerobic bacteria are loaded outside the biological filler.
Preferably, the fan is a submerged fan.
Preferably, the bottom of the tank body is provided with a sludge discharge port, and the sludge discharge port is suitable for discharging sludge generated in the tank body.
According to the invention, the first sieve plate and the second sieve plate are arranged in the tank body, and the biological filler is arranged between the first sieve plate and the second sieve plate, so that the density of the biological filler is close to that of sewage; in addition, first sieve can prevent that the biofilm carrier from sinking into jar body bottom, guarantee that biofilm carrier and sewage fully contact, also avoided biofilm carrier and jar body bottom mud to mix and influence the inside microbial activity of filler, and accessible second sieve reciprocates, can extrude the biofilm carrier, avoid the inside thalli overgrowth of biofilm carrier, or external impurity adheres to, lead to the biofilm carrier to go up mud too much, influence sewage treatment effect, and because the bacterial of biofilm carrier is attached to on the filler carrier, be difficult for being washed away by sewage and lead to the thalli to run off, the treatment effect is more stable.
The invention also aims to provide a sewage COD purification method, which adopts the sewage COD purification device for purification and comprises the following steps:
step S1, mixing sewage to be treated and activated sludge containing COD degrading bacterial strains to form a mixed solution, introducing the mixed solution into the sewage COD purification device, adding a biological filler, aerating by using an aeration device, aeration tightly for 8-24 hours to make the biological filler fully contact with the activated sludge, then discharging the mixed solution, repeating for 2-3 times, then domesticating microorganisms on the biological filler by adopting continuous water inlet, continuous water outlet and continuous aeration modes, and continuously operating for 8-12d, wherein when a biological film grows on the biological filler, the film hanging success is indicated;
and S2, after the biofilm formation of the biological filler is successful, introducing the sewage into the sewage COD purification device, controlling the concentration of dissolved oxygen to be 5-12mg/L and the hydraulic retention time to be 0.5-5h, and continuously stirring in the process to finish the sewage COD purification treatment.
According to the invention, the COD in the sewage is purified by the sewage COD purification device, the biological filler is subjected to pre-membrane-hanging treatment, the biological filler after pre-membrane-hanging contains a large amount of active microorganisms and can be fully contacted with the sewage, the purification parameters are set to be the dissolved oxygen content of 5-12mg/L and the hydraulic retention time of 0.5-5h in the sewage treatment process, the sewage treatment effect can be ensured, and the treatment time is short.
Drawings
FIG. 1 is a sectional view of a sewage COD purifying apparatus according to an embodiment of the present invention;
FIG. 2 is an enlarged view of area A of FIG. 1;
FIG. 3 is a top view of the sewage COD purifying apparatus according to the embodiment of the present invention;
FIG. 4 is a schematic structural view of an aeration apparatus according to an embodiment of the present invention.
Description of the reference numerals:
1-tank body; 11-an aeration device; 111-an aerator pipe; 1111-an aeration disc; 12-a first screen deck; 121-screw rod; 1211 — a second gear; 13-a second screen deck; 14-a biological filler; 15-a stirrer; 16-a sludge discharge port; 2-a fan; 3, a motor; 31-a motor shaft; 311-first gear.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments thereof are described in detail below.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
As shown in fig. 1 and fig. 3, an embodiment of the present invention provides a sewage COD purification apparatus, including a tank 1 and a fan 2, an aeration device 11, a first sieve plate 12 and a second sieve plate 13 are disposed in the tank 1, the aeration device 11 is connected to the fan 2, the first sieve plate 12 and the second sieve plate 13 are located above the aeration device 11, and a biological filler 14 is disposed between the first sieve plate 12 and the second sieve plate 13, wherein the first sieve plate 12 is fixedly disposed in the tank 1, the second sieve plate 13 is movably disposed above the first sieve plate 12, and the second sieve plate 13 is adapted to reciprocate in an up-down direction to extrude the biological filler 14.
Specifically, the sewage COD purification device comprises a tank body 1 and a fan 2, wherein an aeration device 11 is arranged in the tank body 1, the aeration device 11 is connected with the fan 2, when the fan 2 works, the aeration device 11 can aerate the tank body 1 to improve the dissolved oxygen content in the sewage, and the increase of the dissolved oxygen content is beneficial to improving the bioactivity of aerobic microorganisms in the device and the degradation capability of organic matters, so that the sewage COD purification efficiency is improved; still be provided with first sieve 12 and second sieve 13 in jar body 1, be provided with evenly distributed's sieve mesh on first sieve 12 and the second sieve 13, wherein, first sieve 12 is located the bottom of jar body 1, second sieve 13 is located first sieve 12 top, and can reciprocate, be provided with biofilm carrier 14 between first sieve 12 and the second sieve 13, because can produce a small amount of mud deposits in jar body 1 bottom in sewage COD purification process, first sieve 12 can keep apart biofilm carrier 14 with the mud of jar body 1 bottom, avoid mud to adhere to biofilm carrier 14 surface, in addition second sieve 13 can reciprocate, 14 surface attached mud of biofilm carrier is detached to accessible squeezing action, make biofilm carrier regeneration, improve the sewage treatment effect. Exemplarily, the fan 2 is a submerged fan, and the submerged fan can be installed underwater without separately arranging a machine room, thereby saving space and cost, and having less noise and low maintenance cost.
By arranging the first sieve plate 12 and the second sieve plate 13 in the tank body 1 and arranging the biological filler 14 between the first sieve plate 12 and the second sieve plate 13, as the density of the biological filler 14 is close to that of sewage, when the aeration device 11 aerates the tank body 1, the biological filler 14 can be fully mixed with the sewage, the contact area between the sewage and the biological filler 14 is enlarged, the sewage treatment efficiency is improved, and the biological filler 14 collides and shears in the sewage, so that bubbles in the tank body 1 are finer, and the utilization rate of oxygen is improved; in addition, the first sieve plate 12 can prevent the biological filler 14 from sinking into the bottom of the tank body 1, ensure that the biological filler 14 is fully contacted with sewage, prevent the biological filler 14 from being mixed with sludge at the bottom of the tank body 1 to influence the activity of microorganisms in the filler, can move up and down through the second sieve plate 13, extrude the biological filler 14, prevent the overgrowth of bacteria in the biological filler 14 or the attachment of external impurities, cause the excessive sludge on the biological filler 14, influence the sewage treatment effect, and because the bacteria of the biological filler 14 are attached to a filler carrier, the bacteria are not easy to be washed by the sewage to cause the loss of the bacteria, and the treatment effect is relatively stable.
A plurality of screw rods 121 are vertically movably arranged on the first sieve plate 12, corresponding screw holes are correspondingly arranged on the second sieve plate 13, the screw rods 121 penetrate through the screw holes on the second sieve plate 13, and when the screw rods 121 rotate, the second sieve plate 13 is suitable for moving up and down along the screw rods 121. Specifically, the bottom of the screw 121 is movably connected with the first sieve plate 12, the screw 121 can rotate along the axis, the screw 121 passes through a screw hole on the second sieve plate 13, the screw hole and the screw 121 have corresponding thread structures, and when the screw 121 rotates, the second sieve plate 13 can reciprocate along the vertical direction of the screw 121. Through the up-and-down movement of the second sieve plate 13, on one hand, when the second sieve plate 13 moves downwards, the biological filler 14 can be extruded, the sludge and overgrown thallus on the surface and inside of the biological filler 14 can be removed, the activity of the biological filler 14 is recovered again, the biological filler 14 is regenerated, the sewage treatment effect is improved, on the other hand, the filling position of the biological filler 14 can be limited by adjusting the position of the second sieve plate 13, the biological filler 14 is in full contact with sewage, and the sewage treatment efficiency is improved.
Illustratively, as shown in fig. 1 and fig. 2, the sewage COD purifying apparatus further comprises a motor 3, a motor shaft 31 of the motor 3 is provided with a first gear 311, the screw 121 is provided with a second gear 1211 engaged with the first gear 311, when the motor 3 is operated, the motor 3 is adapted to drive the screw 121 to rotate, wherein the motor shaft 31 may be belonging to the motor 3 itself or a transmission shaft connected with the motor 3, the first gear 311 and the second gear 1211 are preferably provided as bevel gears, and the two bevel gears can be driven in a mutually perpendicular manner. The screw rod 121 is driven to rotate by the motor 3, so that the second sieve plate 13 is moved up and down, and the automation degree of the device is improved.
The tank body 1 is also internally provided with a stirrer 15, and the stirrer 15 is obliquely arranged at the bottom of the tank body. The mixer 15 can improve the mixing uniformity of the sewage and the biological filler 14 in the tank body 1, and can improve the dissolved oxygen content in the sewage through sewage flow, thereby improving the sewage treatment efficiency and effect. Specifically, 15 slopes of mixer set up in jar body 1 bottom near the position of side, and mixer 15 includes at least two, and when the mixer 15 simultaneous workings that a plurality of slopes set up, can make the sewage in different regions form the convection current, makes the sewage mixture in the jar body 1 more even, and sewage treatment's stability is better.
Wherein, the biological filler 14 is polyurethane modified biological affinity filler. The polyurethane modified biological affinity filler has physical adsorption effect and positive and negative charge attraction, and the carrier surface has certain cationic active groups, namely clear water groups such as hydroxyl groups and the like, and can be fixedly combined with microorganisms with negative charges in sewage in a bond and valence manner, so that the microorganisms and the biological enzymes are firmly fixed on the carrier, the living microorganisms are not easy to lose under the shearing action of water and gas, the load of the microorganisms is large, and the volume load is high.
The biological filler 14 is subjected to pre-film coating treatment, anaerobic bacteria and/or facultative bacteria are loaded inside the biological filler 14, and aerobic bacteria are loaded outside the biological filler 14. Specifically, the biofilm carrier 14 is subjected to a pre-biofilm treatment in a manner comprising: inoculating activated sludge in an aerobic tank, introducing sewage to be treated, adding nutrient substrates such as urea, diamine, white sugar and the like to supplement nutrients required by microorganisms, stacking biological fillers in the biological tank, standing for 4-5h to inoculate solid microorganisms onto the fillers, then intermittently aerating, aerating for 1h every 2h, repeating for 4-5 days, starting to continuously feed small water in the 6 th day, aerating, controlling dissolved oxygen to be 2-4mg/L, and after 15-20 days, making the fillers sticky and greasy to touch and show protozoa such as flagellates, ticks, paramecium and the like, namely marking that the biological fillers 14 are filmed. The inside and the surface of the biological filler 14 subjected to the pre-film-coating treatment are filled with microorganisms suitable for actual water quality conditions, anaerobic bacteria and/or facultative bacteria are loaded in the biological filler 14 according to different aerobic conditions of different microorganisms, aerobic bacteria are loaded outside the biological filler 14, the biological filler 14 subjected to the pre-film-coating treatment can adapt to sewage treatment quickly, and the treatment effect is better.
In the sewage COD purification device, the filling rate of the biological filler 14 is 5 to 88 percent. The filling rate of the biological filler 14 can influence the flowing effect of the filler in the sewage, and the higher the filling rate is, the poorer the flowability is, and conversely, the better the flowability is. For different types of sewage, different filling rates of the biological filler 14 can be set, and the filling rate is set to be 5% -88%, so that the fluidity can be ensured, and sufficient biological filler 14 can be provided for sewage treatment.
As shown in fig. 4, the aeration apparatus 11 includes a plurality of aeration pipes 111 uniformly distributed, and an aeration disc 1111 is disposed on the aeration pipes 111. Evenly distributed's aeration pipe 111 can make gas distribution more even, makes dissolved oxygen content unanimous in the sewage of different regions, and aeration dish 1111 can further disperse the air, makes air distribution more even, can cut into tiny bubble with the air simultaneously, and the dissolving effect in aqueous is better.
The bottom of the tank body 1 is provided with a sludge discharge port 16, and the sludge discharge port 16 can discharge sludge generated in the tank body 1. Can produce the sediment material in sewage COD purification treatment process, form mud in jar body 1 bottom, through set up mud discharging port 16 in jar body 1 bottom, can regularly discharge mud according to the mud production condition, avoid mud excessive overstock in jar body 1, influence the treatment effect of sewage.
Another embodiment of the present invention provides a method for purifying sewage COD, which comprises the following steps:
step S1, mixing the sewage to be treated with activated sludge containing COD degrading strains to form a mixed solution, introducing the mixed solution into a sewage COD purification device, adding biological filler, aerating the device, aeration for 8-24h to fully contact the biological filler with the activated sludge, then discharging the mixed solution, repeating for 2-3 times, then domesticating the microorganisms on the biological filler by adopting continuous water inlet, continuous water outlet and continuous aeration, continuously running for 8-12d, and when a biological film grows on the biological filler, indicating that the film is successfully hung;
and step S2, after biofilm formation of the biological filler is successful, introducing the sewage into a sewage COD purification device, controlling the concentration of dissolved oxygen to be 5-12mg/L and the hydraulic retention time to be 0.5-5h, and continuously stirring in the process to finish the sewage COD purification treatment.
Through adopting above-mentioned sewage COD purifier to purify sewage, carry out the biofilm carrier with the biofilm carrier and handle in advance, biofilm carrier after the biofilm carrier contains a large amount of active microorganisms in advance to can fully contact with sewage, and the parameter sets up to: the dissolved oxygen content is 5-12mg/L, the hydraulic retention time is 0.5-5h, the COD degradation efficiency can be improved by increasing the dissolved oxygen content, but when the dissolved oxygen concentration is too high, an anoxic zone cannot be formed inside the biological filler, the problem of low ammonia nitrogen degradation efficiency is easily caused, the COD degradation efficiency is low by excessively decreasing the dissolved oxygen content, the dissolved oxygen content is set to be 5-12mg/L, the COD degradation efficiency can be ensured to be higher, the anoxic zone can be formed inside the biological filler, the ammonia nitrogen degradation efficiency can be improved, and the COD in the sewage can be fully degraded by setting the hydraulic retention time to be 0.5-5 h.
The treatment process of the sewage treatment system is described below with reference to specific examples:
examples
The embodiment selects the sewage through pretreatment to carry out COD purification treatment, and through detecting, the index of intaking is: chemical Oxygen Demand (COD) 186.5mg/L, Total Nitrogen (TN) 45.3mg/L, ammonia Nitrogen (NH)4 +-N) ═ 26.7mg/L and Total Phosphorus (TP) ═ 2.5 mg/L.
The sewage COD purifier that this embodiment adopted includes: the aeration device 11, the first sieve plate 12, the second sieve plate 13 and the stirrer 15 are arranged in the tank body 1, the aeration device 11 and the stirrer 15 are positioned at the bottom of the tank body, the fan 2 is connected with the aeration device 11, the first sieve plate 12 is fixedly arranged above the aeration device 11, the second sieve plate 13 is movably arranged above the first sieve plate 12, and a polyurethane modified biological filler 14 subjected to pre-film-hanging treatment is arranged between the first sieve plate 12 and the second sieve plate 13. Two screw rods 121 are movably arranged on the first sieve plate 12, two screw holes are correspondingly arranged on the second sieve plate 13, a second gear 1211 is arranged at the top of each screw rod 121, a first gear 311 is arranged on a motor shaft 31 of the motor 3, the first gear 311 is meshed with the second gear 1211 and connected with the motor shaft, and after the motor 3 is started, the screw rods 121 can be driven to rotate, and the second sieve plate 13 can move up and down.
The sewage COD purification method adopted by the embodiment comprises the following steps:
step S1, mixing the sewage to be treated with activated sludge containing COD degrading bacterial strains to form a mixed solution, introducing the mixed solution into a sewage COD purification device, adding biological filler, aerating in the device, aerating for 16h to fully contact the biological filler with the activated sludge, then discharging the mixed solution, repeating for 3 times, then domesticating the microorganisms on the biological filler by adopting a continuous water inlet, continuous water outlet and continuous aeration mode, continuously running for 10d, and when a biological film grows on the biological filler, indicating that the film is successfully hung;
step S2, inputting the pretreated sewage into a tank body of a sewage COD purification device, and starting a stirrer to uniformly mix the sewage and the biological filler;
step S3, starting a fan, aerating the tank body through an aeration device, controlling the concentration of dissolved oxygen to be 8mg/L, ensuring the flow rate of sewage input, and keeping the hydraulic retention time to be 2h, wherein the stirrer is kept in a working state in the treatment process;
and step S4, allowing the treated sewage to flow out through an overflow port at the top of the tank body, moving the second sieve plate downwards every 20 days to extrude the biological filler, and performing desliming resuscitation treatment.
Through detection, the indexes of the sewage after the sewage COD purification treatment are as follows: COD 9.3mg/L, TN 16.7mg/L, NH4 +-N＝0.36mg/L，TP＝0.08mg/L.
As can be seen from the results, the COD of the sewage after the COD purification treatment is reduced by 95.0 percent, TN is reduced by 63.1 percent, and NH is added4 +N is reduced by 98.7 percent, TP is reduced by 96.8 percent, COD in the sewage is effectively treated, and total nitrogen, ammonia nitrogen and total phosphorus in the sewage can be obviously reduced. The aerobic microorganisms are loaded outside the biological filler subjected to the pre-film-hanging treatment, so that the COD can be effectively reduced, the anaerobic microorganisms are loaded inside the biological filler, the total nitrogen treatment effect is good, and the effect on ammonia nitrogen is particularly obvious.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. The sewage COD purification device is characterized by comprising a tank body (1) and a fan (2), wherein an aeration device (11), a first sieve plate (12) and a second sieve plate (13) are arranged in the tank body (1), the aeration device (11) is connected with the fan (2), the first sieve plate (12) and the second sieve plate (13) are positioned above the aeration device (11), and a biological filler (14) is arranged between the first sieve plate (12) and the second sieve plate (13), wherein the first sieve plate (12) is fixedly arranged in the tank body (1), the second sieve plate (13) is movably arranged above the first sieve plate (12), and the second sieve plate (13) is suitable for reciprocating movement in the up-down direction to extrude the biological filler (14).
2. The sewage COD purification apparatus according to claim 1, wherein a plurality of screws (121) are vertically movably arranged on the first sieve plate (12), screw holes are correspondingly arranged on the second sieve plate (13), the screws (121) pass through the screw holes, and when the screws (121) rotate, the second sieve plate (13) is suitable for moving up and down along the screws (121).
3. The sewage COD purification device of claim 2, further comprising a motor (3), wherein a motor shaft (31) of the motor (3) is provided with a first gear (311), the screw (121) is provided with a second gear (1211) engaged with the first gear (311), and the motor (3) is adapted to drive the screw (121) to rotate.
4. The sewage COD purification apparatus according to claim 1, wherein a stirrer (15) is further arranged in the tank body (1), and the stirrer (15) is obliquely arranged at the bottom of the tank body (1).
5. The sewage COD purification apparatus according to claim 1, characterized in that the biological filler (14) is a polyurethane modified bio-affinity filler.
6. The sewage COD purification apparatus according to claim 1, wherein the filling rate of the biological filler (14) is 5-88%.
7. The sewage COD purification apparatus according to claim 1, wherein the biological filler (14) is pre-coated with a membrane, the biological filler (14) is internally loaded with anaerobic bacteria and/or facultative bacteria, and the biological filler (14) is externally loaded with aerobic bacteria.
8. The sewage COD purification apparatus of claim 1, wherein the fan (2) is a submerged fan.
9. The sewage COD purification apparatus according to claim 1, wherein the tank (1) is provided with a sludge discharge port (16) at the bottom, the sludge discharge port (16) being adapted to discharge sludge generated in the tank (1).
10. A sewage COD purification method, which is characterized by using the sewage COD purification apparatus according to any one of claims 1 to 9, comprising the steps of:
step S1, mixing sewage to be treated and activated sludge containing COD degrading strains to form a mixed solution, introducing the mixed solution into a sewage COD purification device, adding a biological filler, aerating by using an aeration device, aeration for 8-24 hours to fully contact the biological filler with the activated sludge, then discharging the mixed solution, repeating for 2-3 times, then domesticating microorganisms on the biological filler by adopting continuous water inlet, continuous water outlet and continuous aeration modes, and continuously operating for 8-12d, wherein when a biological film grows on the biological filler, the successful film hanging is shown;
and step S2, after the biofilm formation of the biological filler is successful, introducing the sewage into the sewage COD purification device, controlling the concentration of dissolved oxygen to be 5-12mg/L and the hydraulic retention time to be 0.5-5h, and continuously stirring in the process to finish the sewage COD purification treatment.
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Application publication date: 20220621 |