CN111943352A - Biological filter for wastewater treatment - Google Patents
Biological filter for wastewater treatment Download PDFInfo
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- CN111943352A CN111943352A CN202010714907.XA CN202010714907A CN111943352A CN 111943352 A CN111943352 A CN 111943352A CN 202010714907 A CN202010714907 A CN 202010714907A CN 111943352 A CN111943352 A CN 111943352A
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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
- C02F3/06—Aerobic processes using submerged filters
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/15—N03-N
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/18—PO4-P
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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
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
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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
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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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
- 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 discloses a biological filter for wastewater treatment, which comprises a filter body, wherein the filter body comprises a first filter body and a second filter body, the bottoms of the first filter body and the second filter body are communicated, a transverse filler frame for fixing fillers is arranged in the first filter body, a transverse aeration pipe is arranged at the lower part of the transverse filler frame, the transverse filler frame is arranged above the communicated part, and long-handle filter caps are uniformly arranged on the lower surface of the fillers; the second tank body comprises three groups of vertical packing frames, the packing is fixed through the vertical packing frames, the thickness of the middle vertical packing frame in the three groups of vertical packing frames is 1.5-2 times of that of the vertical packing frames on two sides, the water passing resistance of the packing in the middle vertical packing frame is smaller than that of the packing in the vertical packing frames on two sides, and turbulence stirring blades and vertical aeration pipes are arranged on two sides of the middle vertical packing frame. The invention has simple structure, low energy consumption of equipment and good purification effect, and can be used for the rear end of a sewage treatment process to carry out fine treatment on purified water.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a biological filter for wastewater treatment in an organic sewage treatment process.
Background
Along with the increasing construction of cities, the treatment of urban sewage also becomes a difficult problem to be solved urgently, so that a sewage treatment system is widely applied. Different sewage treatment systems are used for treating different kinds of sewage, and corresponding sewage treatment systems need to be designed according to the characteristics of various kinds of sewage. For the treatment of urban sewage, the conventional treatment method is that firstly fiber impurities and suspended particles in the wastewater are removed through a grating, then the wastewater is pumped into an air floatation tank through a pump structure, a coagulant is added into the air floatation tank to remove fine suspended substances and oil-containing substances in the wastewater, then the treated water is sent into an aeration biological filter, and the water is pumped back to a clean water tank after soluble pollutants in the wastewater are removed through the biological filter.
In the above-mentioned treatment process, the aeration oxygenation treatment process in the aeration biological filter is the most important technical guarantee means in urban sewage treatment and other various industrial wastewater treatment processes, the aeration biological filter (BAF for short) has very extensive application in the field of water treatment, it is a new biological method sewage treatment technology developed on the basis of ordinary biological filter by referring to the water supply filter process, it introduces air or auxiliary catalyst into the aeration tank through proper equipment, make the sewage in the tank contact with air and oxygenate, and impel the microorganism in the tank to carry on the oxidative decomposition to the organic matter in the sewage, in order to achieve the goal of clean water source. However, the biological aerated filter in the prior art is too simple in structure, water flow in the filter is in a relatively static state, dirt in the filter cannot be subjected to uniform contact reaction, and in the biological aerated filter, due to the fact that the filter is provided with the materials such as quartz sand, broken stones, cobblestones, coke and other gap materials as fillers, the effect of the stirring turbulence structure added in the biological aerated filter is not good, auxiliary equipment is arranged on the market to solve the problems occurring in the biological aerated filter, the structure of the system can be more complicated due to the fact that the auxiliary equipment is added, early investment and later operation and maintenance cost are high, and the operation pressure of an operation department can be increased.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a biological filter for wastewater treatment, which aims to solve the defects in the technical background.
The technical problem solved by the invention is realized by adopting the following technical method:
a biological filter for wastewater treatment comprises a filter body, wherein the filter body is divided into a first filter body and a second filter body by a partition plate, a water inlet pipe is arranged at the upper part of the front end of the first filter body, an overflow structure is arranged at the upper part of the rear end of the second filter body and serves as a water outlet pipe, and a communicating part is arranged at the bottom of the filter body between the first filter body and the second filter body;
a transverse filling frame is arranged in the first tank body, filling materials are fixed on the transverse filling frame, the transverse filling frame is arranged in the first tank body, the cross section of the first tank body at the position is subjected to surface sealing at the arrangement position in the first tank body, the filling materials fixed on the transverse filling frame are higher than the arrangement plane of the communicating part, and long-handle filter caps with lower parts extending to the plane position of the communicating part are uniformly arranged on the lower surface of the filling materials;
three groups of vertical filler frames are arranged in the second tank body, the thickness of a middle vertical filler frame in the three groups of vertical filler frames is 1.5-2 times that of the vertical filler frames on two sides, fillers are fixed on the vertical filler frames, the water passing resistance of the fillers in the middle vertical filler frame is smaller than that of the fillers in the vertical filler frames on two sides, meanwhile, turbulent flow stirring blades are respectively arranged on two sides of the middle vertical filler frame, and the flow guide directions of the turbulent flow stirring blades face the middle vertical filler frame;
still be provided with aeration components in the filtering pond cell body, aeration components includes the aeration pipe, the aeration pipe of first cell body transversely sets up in horizontal filler frame lower part, and the aeration pipe of second cell body is vertical to be set up in the both sides of the vertical filler frame in centre.
As further injecteing, the air supporting device is connected with biological filter front end for waste water treatment, and the air supporting device front end is provided with stirs mixing arrangement in advance, the water inlet department of air supporting device is equipped with PAC and adds the medicine mouth, and stir mixing arrangement in advance including independent and the rapid mixing region and the slow speed stirring region that set up in proper order, and PAM adds the medicine mouth and sets up in the slow speed stirring region.
By further limitation, the mixing porosity of the filler in the transverse filler frame is 45-60%.
As a further limitation, floating materials are filled in the transverse filling frame, are bamboo branches and bamboo tubes and are connected through the recovered damaged fishing net to form a cross-linked structure; and the volume ratio of the filler to the floating material in the transverse filler frame is 4: 1-5: 1.
As a further limitation, a communication hole is formed in the lower part of the partition plate to enable the first tank body and the second tank body to be communicated at the bottom of the filter tank body, and a filter frame or a combined filter screen can be selectively arranged at the position of the communication hole to filter water entering the second tank body; the filter frame comprises at least two layers of filter screens, the filter screens are fixed on the filter frame, at least one layer of filter screen is arranged on the surfaces of two sides of the filter frame to seal the outer side surface, and a mixture with the uniform proportion of 3: 1-5: 1 mass ratio of sepiolite/zeolite particles to sodium titanate nano filler is filled in the filter frame as an adsorbent.
As a further limitation, the vertical filler frame is a honeycomb support, the two side surfaces of the honeycomb support are sealed by nylon nets, and composite material layers are formed on the inner side surfaces of the nylon nets, wherein each composite material layer comprises multiple nylon fiber fabric layers, and PVDF film layers and electrostatic spinning nanofiber film layers formed between the nylon fiber fabric layers.
As further limitation, the bottom surface of the first tank body is an inclined bottom, and a sludge settling tank is arranged at the bottom of the inclined bottom, so that sludge at the bottom of the tank body can be conveniently and regularly discharged.
Has the advantages that: the biological filter for wastewater treatment is a high-efficiency and low-energy-consumption biological sewage treatment device integrating biological oxidation, solid-liquid separation and biological adsorption, has the advantages of small occupied area, high oxygen utilization efficiency, low investment and operation cost, convenience in management, good effluent quality, strong impact load resistance and the like, is suitable for centralized sewage treatment and dispersed sewage treatment, and meets the national conditions and the requirements of related enterprises in China.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.
Fig. 2 is an enlarged detail view of the filter frame of fig. 1.
Wherein: 1. a water inlet pipe; 2. a filter pool body; 3. a first tank body; 4. a first filler; 5. a bamboo tube; 6. damaging the fishing net; 7. bamboo branches; 8. a partition plate; 9. a first vertical stuffing frame; 10. a first turbulence stirring paddle; 11. a vertical aeration pipe; 12. a second vertical stuffing frame; 13. a second turbulence stirring paddle; 14. a third vertical stuffing frame; 15. an overflow pipe; 16. a transverse aeration pipe; 17. a transverse filler frame; 18. a long-handle filter cap; 19. a sludge settling tank; 20. a filter frame; 21. a second tank body; 201. a first nylon filter screen; 202. a filter frame body; 203. a second nylon filter screen; 204. an adsorbent; 205. a third nylon filter screen; .
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
In the following examples, it will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Referring to fig. 1, the biological filter for wastewater treatment includes a filter tank body 2, the filter tank body 2 is a cement or glass fiber reinforced plastic tank body, in this embodiment, the filter tank body 2 is a pre-embedded tank body, and when pre-embedded treatment is performed, a corresponding air supply pipeline is pre-embedded to connect a transverse aeration pipe 16 and a vertical aeration pipe 11. The filter tank body 2 is divided into a first tank body 3 on the left side and a second tank body 21 on the right side by a partition plate 8, the volume of the first tank body 3 is 1/3 of the second tank body 21, a communication hole is arranged on the lower part of the partition plate 8, a filter frame 20 is arranged on the communication hole, and the first tank body 3 and the second tank body 21 are communicated with each other at the bottom of the filter frame 20.
The first tank body 3 is provided with a water inlet pipe 1, the second tank body 21 is provided with an overflow pipe 15 as a water outlet pipe, and the setting plane of the water inlet pipe 1 is higher than the setting plane of the overflow pipe 15 so as to form the highest liquid level height shown by a dotted line in the filter tank body 2. The filter frame 20 is structured as shown in fig. 2, and includes three layers of nylon filter screens, namely, a first nylon filter screen 201, a second nylon filter screen 203, and a third nylon filter screen 205, the first nylon filter screen 201, the second nylon filter screen 203, and the third nylon filter screen 205 are respectively disposed on two sides of two filter frame bodies 202 with a honeycomb lattice and with a thickness, the two filter frame bodies 202 are fixed on the outer sides, and are surface-sealed on the two sides by the first nylon filter screen 201 and the third nylon filter screen 205, and the honeycomb lattice of the filter frame body 202 is filled with an adsorbent 204, in this embodiment, the adsorbent 204 is a mixture of sepiolite and sodium titanate nanofiller with a mass ratio of 4: 1.
In the first tank body 3 of the present embodiment, a transverse stuffing frame 17 is arranged, the transverse stuffing frame 17 seals the first tank body 3 on the cross section and is arranged on the plane corresponding to the filter frame 20, a first stuffing 4 and a floating material are fixed on the transverse stuffing frame 17, the volume ratio of the first stuffing 4 to the floating material is 4:1, in the present embodiment, the floating material adopts a bamboo tube 5, bamboo branches 7 and a recovered damaged fishing net 6 which also have the filtering effect, and the bamboo tube 5 and the bamboo branches 7 are wound through the recovered damaged fishing net 6 to form a cross-linked structure; in another embodiment, the floating material can also adopt reed, straw or a mixture of reed, straw, bamboo tube 5 and bamboo branch 7 in proportion, and is wound and crosslinked by damaged fishing net 6; the mixing void ratio of the first filler 4 and the floating material on the filter frame 20 after proportional matching and interval laying is 56%, and the first filler and the floating material are uniformly arranged on the transverse filler frame 17. Meanwhile, a plurality of long-handle filter caps 18 are arranged on the lower surface of the transverse filling frame 17, the long-handle filter caps 18 are uniformly arranged on the lower surface of the transverse filling frame 17, the upper part of the long-handle filter caps is inserted into the first filling 4, and the lower part of the long-handle filter caps extends to the arrangement plane position of the filter frame 20. In addition, the lower part of the transverse filling frame 17 is provided with a transverse aeration pipe 16, aeration heads are uniformly distributed on the transverse aeration pipe 16, the aeration direction of the aeration heads on the transverse aeration pipe faces the transverse filling frame 17, the transverse aeration pipe 16 is used for aeration inside the first tank body 3, and when the first tank body 3 stops working, the transverse aeration pipe can be connected with an external water pump and used for backwashing inside the first tank body 3.
The bottom surface of first cell body 3 sets up to oblique end, is provided with sediment mud groove 19 through the hypotenuse bottom of oblique end, and this sediment mud groove 19 can be used to accumulate the silt of sedimentation in first cell body 3 to conveniently carry out periodic cleaning.
And be provided with three vertical filler frames of group in the second cell body 21, be first vertical filler frame 9 from inlet tube 1 side to overflow pipe 15 side in proper order, vertical filler frame 12 of second and third vertical filler frame 14, the structure of three vertical filler frames of group is similar, be the honeycomb support, and all carry out the face through the nylon wire in the both sides of three vertical filler frames of group and seal, and the medial surface shaping on the nylon wire has combined material layer, in this embodiment, combined material layer includes three-layer nylon fiber fabric layer, and it has one deck PVDF rete and one deck electrostatic spinning nanofiber rete to form respectively between the layer on three-layer nylon fiber fabric layer.
The thickness of a first vertical packing frame 9 and a third vertical packing frame 14 in the three groups of vertical packing frames is consistent, the thickness of a second vertical packing frame 12 is 1.5 times of the thickness of the first vertical packing frame 9 and/or the third vertical packing frame 14, the packing adopted in the first vertical packing frame 9 and the third vertical packing frame 14 can be the same or different, the packing in the second vertical packing frame 12 is different from the packing in the first vertical packing frame 9 and the third vertical packing frame 14, the water passing resistance of the packing in the second vertical packing frame 12 is smaller than the water passing resistance of the packing in the first vertical packing frame 9 and the third vertical packing frame 14 on both sides, in addition, a first turbulent flow stirring paddle 10 and a second turbulent flow stirring paddle 13 are respectively arranged on both sides of the second vertical packing frame 12, the first turbulent flow stirring paddle 10 and the second turbulent flow stirring paddle 13 are oppositely arranged, and the drainage directions of the first turbulent flow stirring paddle 10 and the second turbulent flow stirring paddle 13 are both towards the second vertical packing frame 12, simultaneously all be provided with vertical aeration pipe 11 between first vortex stirring paddle leaf 10 and the vertical filler frame 12 of second and between second vortex stirring paddle leaf 13 and the vertical filler frame 12 of second, wherein be equipped with a plurality of aeration holes on the vertical aeration pipe 11, its aeration hole's internal diameter reduces by bottom to the top of vertical aeration pipe 11 gradually, avoids because pressure is different under water, and vertical aeration pipe 11 aeration is inhomogeneous.
The biofilter for wastewater treatment of the embodiment utilizes the bamboo tube 5, the bamboo branches 7 and the damaged fishing net 6 to wind in the first tank body 3 to form a cross-linked structure floating material structure, so that the first filler 4 presents fluffy feeling, the buoyancy of the floating material is utilized as power, the water level is periodically changed by matching with the inflow water, the static biofilter moves, the horizontal state of the treated horizontal plane slowly rises and quickly falls due to the height of the water level, when sewage flows in, the water level slowly rises to float the bamboo tube, the bamboo branches filled inside are automatically bounced under the non-pressure state, so that the effect of stirring the sewage is achieved, the suspended matter form in the sewage is changed, the stability of the mixed void ratio of the first filler 4 is ensured, the degradation efficiency of a biological membrane in the filler is ensured, the purposes of accelerating the degradation of organic matters and ammonia nitrogen pollutants are achieved, the burden of the first filler 4 is reduced, and the blockage rate is reduced on the transverse filler frame 17, the cleaning interval and the service life of the first filler 4 can be effectively prolonged.
In order to further optimize the use effect of the first filler 4 in the first tank 3, the front end of the biological filter for wastewater treatment in this embodiment may be connected to an air flotation device, and a pre-stirring and mixing device with a fast stirring area and a slow stirring area may be disposed at the front end of the air flotation device. The air-float water inlet is equipped with PAC dosing port, and PAM dosing port is set in the slow stirring zone of the premixing mixing device, the sewage is fed with PAC liquor at the air-float water inlet, after the quick stirring, the sewage flows into the slow stirring zone, after the PAM liquor is fed into the slow stirring zone, the sewage is slowly stirred, and its liquor and raw sewage are fully mixed and reacted, then fed into the air-releasing zone of the air-float device through flow-guide pipe, at the same time the water after treatment is fed into the dissolved air tank by means of reflux pump, and then fed into the dissolved air tank according to a certain proportion to form dissolved air water, and the dissolved air water is fed into the upper portion of flow-guide pipe of air-releasing zone through water-distributing pipeline and releaser, and mixed with raw sewage and dissolved air water, and then fed into the separation chamber of the air-float. Because of the unbalance between the gas-water mixture and the liquid, an upward buoyancy is generated, and flocs in sewage adhere to the micro bubbles, float upwards together and are supported to the liquid surface, so that the effect of purifying the water quality is achieved. Scum floating to the liquid level is scraped and collected by a scum scraper at the upper part of the tank body and is sent into a scum pipeline, and then the scum is sent into a collecting device outside the tank through a spiral conveying device. The sewage flows into the water outlet through the overflow adjusting device after being purified and enters the biological filter for wastewater treatment, and the pretreatment means can further prolong the service life of the biological filter for wastewater treatment and reduce the maintenance and cleaning frequency.
And the sewage after being treated by the first tank body 3 enters the second tank body 21 from the lower part of the first tank body 3, and needs to be rapidly purified by the fillers in the first vertical filler frame 9, the second vertical filler frame 12 and the third vertical filler frame 14 in sequence and the oxidation degradation capability of the high-concentration biomembrane on the surface of the corresponding filler, so that the sewage is subjected to a biological oxidation degradation process and does not cause environmental pollution. In the process, because the first turbulence stirring paddle blade 10, the vertical aeration pipe 11 and the second vertical filling frame 12 are structurally arranged and the water passing resistance of the filler on the second vertical filling frame 12 is smaller than the characteristics of the first vertical filling frame 9 and the third vertical filling frame 14, the pressure difference is formed between the two sides of the second vertical filling frame 12 and the outer sides of the first vertical filling frame 9 and the third vertical filling frame 14, when sewage flows through the pressure difference, the fillers in the first vertical filling frame 9 and the third vertical filling frame 14 are in an integral compression state, the suspended matters in the sewage can be intercepted by utilizing the characteristic of adsorbability of the fillers and the biological flocculation effect of the biological membranes, the dropped biological membranes can be ensured not to float out along with the water and are attached to the surfaces of the first vertical filling frame 9 and the third vertical filling frame 14, and the filler in the second vertical filling frame 12 is in a high-circulation pore state, and through the vortex effect of the first vortex stirring paddle 10 and the second vortex stirring paddle 13 which are arranged oppositely, opposite vortex flows are formed on two sides of the second vertical filling frame 12, so that the sewage is ensured to be fully contacted and reacted with the biological membrane in the second vertical filling frame 12.
The biological filter for wastewater treatment of the embodiment is used for simulating sewage treatment, wherein the first filler 4 is a light plastic filler, and the fillers adopted by the first vertical filler frame 9 and the third vertical filler frame 14 are 1:1 mixtures of ceramsite and natural clinoptilolite; the second vertical filling frame 12 adopts fly ash ceramsite filling, sewage after pretreatment of the canteen sewage of a certain university is treated under the condition that the technical conditions are met, the same canteen sewage of the university is treated by a single-cavity biofilter with approximate nominal parameters prepared by a certain enterprise in Henan to obtain a comparison group, and relevant parameters of the quality of sewage inlet water and outlet water are obtained, wherein NH is4 +the-N concentration is obtained by means of concentration Nagowski reagent spectrophotometry, COD（Cr）Obtained by the process of potassium dichromate concentration, NO2 --N concentration and NO3 -the-N concentration is obtained by ion chromatography, the TN concentration is obtained by TN measurement in a TOC measurement apparatus, PO4 3-the-P concentration was obtained using molybdate spectrophotometry, yielding the following water quality characterization table:
as can be seen from the above table, the biofilter for wastewater treatment of the present embodiment not only relies on biological oxidation, but also has significant biological adsorption and filtration effects, so that substances with larger particle sizes can be removed, some substances with weak biodegradability can be removed by adsorption, and some substances which are difficult to degrade can be adsorbed and retained in the biofilter, so as to be removed, thereby having better treatment effect on organic matter sewage, and the effluent quality of the biofilter is obviously superior to that of the comparative group, meanwhile, the biofilter for wastewater treatment of the present embodiment also has the advantages of low loss, long service life, and long back-washing treatment interval, and only needs to provide power for the first stirring blades 10 and the second stirring blades 13, and other operations can be realized by only utilizing the gravity and water pressure of sewage itself, and simultaneously reduce the operation costs of back-washing, aeration amount and the like of the biofilter for aeration, has the advantage of low running cost.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A biological filter for wastewater treatment comprises a filter body and is characterized in that the interior of the filter body is divided into a first filter body and a second filter body by a partition plate, a water inlet pipe is arranged at the upper part of the front end of the first filter body, an overflow structure is arranged at the upper part of the rear end of the second filter body and used as a water outlet pipe, and a communicating part is arranged at the bottom of the filter body of the filter;
a transverse filling frame is arranged in the first tank body, filling materials are fixed on the transverse filling frame, the transverse filling frame is arranged in the first tank body, the cross section of the first tank body at the position is subjected to surface sealing at the arrangement position in the first tank body, the filling materials fixed on the transverse filling frame are higher than the arrangement plane of the communicating part, and long-handle filter caps with lower parts extending to the plane position of the communicating part are uniformly arranged on the lower surface of the filling materials;
three groups of vertical filler frames are arranged in the second tank body, the thickness of a middle vertical filler frame in the three groups of vertical filler frames is 1.5-2 times that of the vertical filler frames on two sides, fillers are fixed on the vertical filler frames, the water passing resistance of the fillers in the middle vertical filler frame is smaller than that of the fillers in the vertical filler frames on two sides, meanwhile, turbulent flow stirring blades are respectively arranged on two sides of the middle vertical filler frame, and the flow guide directions of the turbulent flow stirring blades face the middle vertical filler frame;
still be provided with aeration components in the filtering pond cell body, aeration components includes the aeration pipe, the aeration pipe of first cell body transversely sets up in horizontal filler frame lower part, and the aeration pipe of second cell body is vertical to be set up in the both sides of the vertical filler frame in centre.
2. The biofilter for wastewater treatment according to claim 1, wherein a floatation device is connected to a front end of the biofilter for wastewater treatment, and a pre-agitation mixing device is provided at a front end of the floatation device.
3. The biofilter for wastewater treatment according to claim 2, wherein a PAC dosing port is arranged at a water inlet of the air flotation device; the pre-stirring mixing device comprises a rapid stirring area and a slow stirring area which are independently and sequentially arranged, and the PAM dosing port is arranged in the slow stirring area.
4. The biofilter for wastewater treatment according to claim 1, wherein a mixing void ratio of the fillers in the transverse filler frame is 45-60%.
5. The biofilter for wastewater treatment according to claim 1, wherein floating materials are filled in the transverse filler frames, and the floating materials are bamboo branches and bamboo tubes which are connected through recovered damaged fishing nets to form a cross-linked structure; the volume ratio of the filler to the floating material in the transverse filler frame is 4: 1-5: 1.
6. The biofilter for wastewater treatment according to claim 1, wherein a communication hole is formed at the lower part of the partition plate to communicate the first cell body and the second cell body at the bottom of the filter cell body, and a filter frame or a combined filter screen is arranged at the position of the communication hole to filter water entering the second cell body.
7. A biofilter for wastewater treatment according to claim 6, wherein the filter frame comprises at least two layers of filter screens, the filter screens are fixed on the filter frame, at least one layer of filter screen is arranged on the two side surfaces of the filter frame to seal the outer side surface, the filter frame has a thickness, and a mixture of sepiolite/zeolite particles and sodium titanate nanofillers with a mass ratio of 3: 1-5: 1 is filled in a thickness space to serve as an adsorbent.
8. The biofilter for wastewater treatment according to claim 1, wherein the vertical filler frame is a honeycomb support, surfaces of two sides of the honeycomb support are sealed by nylon nets, a composite material layer is formed on the inner side surface of each nylon net, and the composite material layer comprises a plurality of nylon fiber fabric layers, and a PVDF film layer and an electrostatic spinning nanofiber film layer which are formed among the fiber fabric layers.
9. The biofilter for wastewater treatment according to claim 1, wherein the bottom surface of the first tank body is an inclined bottom, and a sludge settling tank is arranged at the bottom of the inclined bottom.
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