CN219429820U - Combined equipment for sewage treatment - Google Patents
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- CN219429820U CN219429820U CN202223296905.7U CN202223296905U CN219429820U CN 219429820 U CN219429820 U CN 219429820U CN 202223296905 U CN202223296905 U CN 202223296905U CN 219429820 U CN219429820 U CN 219429820U
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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 utility model belongs to the field of sewage treatment, and provides combined equipment for sewage treatment, which comprises: the device comprises a short-cut nitrification and denitrification tank, a dynamic biological filter membrane separation tank and an anaerobic ammoxidation tank which are connected in sequence, wherein a dynamic biological filter membrane separator is arranged in the dynamic biological filter membrane separation tank. The combined equipment is used for treating sewage with high ammonia nitrogen and low COD, can achieve high-efficiency deep denitrification, simultaneously reduce COD and total phosphorus in the sewage, maintain good solid-liquid separation effect, and optimize the effluent index.
Description
Technical Field
The utility model belongs to the field of sewage treatment, and particularly relates to a combined device for sewage treatment.
Background
At present, the core treatment section in the field of sewage treatment mainly adopts a membrane filtration system, and combines the combined technical means of synchronous nitrification and denitrification and deep denitrification, so that the method is applied to the core treatment section of sewage treatment, and the sewage separation effect is maintained, and meanwhile, the treatment effect of high-efficiency denitrification and dephosphorization is achieved.
At present, synchronous nitrification and denitrification are realized in a reactor by adopting modes such as aeration and the like so that the reactor alternately has anoxic and aerobic environments, and the dissolved oxygen gradient provides a dominant environment for the action of denitrifying bacteria and nitrifying bacteria, thereby ensuring the efficient performance of synchronous nitrification and denitrification reactions.
The current solid-liquid separation technology is mainly an MBR membrane filtration technology, and an MBR membrane filtration system mainly utilizes the selective permeability of a membrane and comprises a membrane component, a suction pump, a vacuum pump, a chemical cleaning device, a dosing device, a pipe fitting, an automatic control system and the like. The MBR membrane filtration system adopts a mode of continuous operation in different periods, and each period comprises a suction filtration step and a suction stopping step. In the running process, as filtration is carried out, the characteristic water production flux from the membrane component to the end of the period is reduced, and pollutants attached to the surface of the membrane are required to fall off through stopping pumping and aeration so as to recover the separation performance of the membrane. Thus, the filtration process is stopped at the end of the cycle, and the filtration is performed after aeration, in such a way that the cycle is continuously operated. With the extension of time, the solid matters in the inlet water can be gradually accumulated on the surface of the membrane, so that the filtration pressure difference can be improved to maintain the water yield of the membrane assembly, and when the transmembrane pressure difference reaches the upper limit of the membrane assembly, backwashing is carried out. The backwashing process can remove solid pollutants on the surface of the membrane and restore the transmembrane pressure difference. However, after a period of operation (including periodic backwashing), the transmembrane pressure difference of the system still gradually increases, and at this time, the operation is stopped to perform chemical cleaning to remove organic pollution or inorganic dirt on the membrane surface and in the membrane pores, and the period and frequency of the chemical cleaning depend on the raw water quality and the operation condition.
In the current membrane filtration and separation process, microorganisms are gradually aggregated to form a biological filter membrane, and the filtration effect is mostly maintained by adopting a mode of inhibiting the formation of the biological filter membrane or a mode of cleaning the membrane by adopting a microorganism quenching mode under the conditions of fouling, filtration speed reduction and poor effect caused by the prolongation of the membrane aperture along with the filtration time. Moreover, the MBR membrane filtration process in the prior art generally has the following defects that are difficult to overcome: the process flow is complex, and the permeability of the membrane can be reduced along with the operation of equipment; the cost of the membrane and maintenance costs are high.
At present, the current anaerobic ammonia oxidation technology mainly comprises forms of SBR (Sequencing Batch Reactor Activated Sludge Process, namely a sequencing batch reactor activated sludge process), granular sludge, MBBR (Moving Bed Biofilm Reactor Process, namely a fluidized bed biological membrane process) and the like according to a reactor form, wherein the three forms are most commonly used as SBR, and the ratio of the three forms is more than 50%, and the three forms are a granular sludge system and the MBBR.
There is no combination device in the prior art that combines an improved nitrification and denitrification tank, a dynamic biological filter separation tank and an improved anaerobic ammonia oxidation tank.
Disclosure of Invention
The embodiment of the utility model provides combined equipment for sewage treatment, which aims to combine an improved nitrification and denitrification tank, a dynamic biological filter membrane separation tank and an improved anaerobic ammonia oxidation tank.
The embodiment of the utility model is realized in that the combined equipment for sewage treatment comprises:
the device comprises a short-cut nitrification and denitrification tank, a dynamic biological filter membrane separation tank and an anaerobic ammoxidation tank which are connected in sequence, wherein a dynamic biological filter membrane separator is arranged in the dynamic biological filter membrane separation tank.
Further, an aeration mechanism is arranged at the bottom of the short-cut nitrification and denitrification tank.
Further, the aeration mechanism is a single-side aeration mechanism.
Further, biological filler is arranged in the short-cut nitrification and denitrification tank.
Further, the biological filler is polyurethane double-ball filler.
Further, the upper end of the dynamic biological filter membrane separator is connected with a pump, and a reflux device for leading out sludge from the dynamic biological filter membrane separator to the short-cut nitrification and denitrification tank is arranged between the dynamic biological filter membrane separator and the short-cut nitrification and denitrification tank.
Still further, the pump is a self priming pump.
Furthermore, the center of the dynamic biological filter separator is provided with at least two guide plates, the guide plates are assembled in a flat plate membrane mode, and the outer side surfaces of the guide plates are respectively provided with a supporting layer at intervals; the support layer is provided with carrier fibers fixed by ultrasonic welding.
Further, two guide plates are arranged in the center of the dynamic biological filter membrane separator, and the distance between the guide plates is 5mm to 25 mm.
Further, the carrier fiber is made of any one of ABS (acrylonitrile-butadiene-styrene copolymer), PE (polyethylene), PVC (polyvinyl chloride) fiber, and the carrier fiber is subjected to hydrophilic modification treatment.
Further, a layer of biological filter membrane is arranged on the outer side of the supporting layer, and the biological filter membrane is formed by activated sludge flocs.
Further, the basic core of the activated sludge flocs is porous powder, and quorum sensing bacteria form the activated sludge flocs on the basis of the porous powder.
Further, the porous powder is activated carbon powder, diatomite or silicon dioxide, and the particle size of the porous powder is 100-300 meshes.
Furthermore, a silicon-carbon filler is arranged in the anaerobic ammonia oxidation tank, and microorganisms form particle-like sludge on the basis of the silicon-carbon filler.
Still further, the silicon carbon filler is particulate and the silicon carbon filler has a porosity of greater than 40%.
Still further, the microorganism is an AOB-type and an AnAOB-type microorganism.
Further, an aeration mechanism is arranged at the bottom of the anaerobic ammonia oxidation tank.
The combined equipment provided by the utility model has the advantages of simple structure and low cost, and the formed biological filter membrane filtration system can realize dynamic balance, reduce the maintenance cost of the membrane and ensure the sewage treatment effect.
Drawings
Fig. 1 is an overall view of a combined apparatus for sewage treatment according to the present utility model.
FIG. 2 is a schematic diagram of a dynamic biofilm separator according to the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Example 1
Short-cut nitrification and denitrification tank
Short-cut nitrification and denitrification: is a novel denitrification process. The basic principle is that ammonia nitrogen oxidation is controlled in a nitrosation stage, and then nitrous acid nitrogen is reduced into nitrogen through denitrification, which is performed through NH 4 + -N→NO 2 - -N→N 2 The whole process is greatly shortened compared with the whole process of nitrification and denitrification.
The synchronous nitrification and denitrification process principle is divided into a macroscopic environment theory and a micro-environment theory.
Macroscopic environment theory: the dissolved oxygen DO in the reactor is mainly obtained by oxygenation of an aeration device, and no matter what aeration device can be used for fully and uniformly mixing oxygen in the reaction in sewage. Finally, anoxic and aerobic sections in different areas inside the reactor are formed, so that dominant environments are provided for the action of denitrifying bacteria and nitrifying bacteria respectively, and the nitrification and denitrification are performed simultaneously in fact.
Microenvironment theory: in addition to the uneven dissolved oxygen in different spaces of the reactor, the change of dissolved oxygen in the reactor at different time points can also lead to the synchronous nitrification/denitrification phenomenon. In the flocs of activated sludge, the concentration distribution of oxygen is uneven at different levels from the surface of the flocs to the inner core of the flocs due to the limitation of oxygen transfer, the concentration of oxygen on the outer surface of the microbial flocs is higher, and the concentration of oxygen on the inner layer is lower. Under the condition that the particle size of the microbial flocs is large enough, an anoxic zone can be formed inside the zoogloea, in this case, aerobic nitrifying bacteria on the outer layer of the flocs are dominant, the nitrifying reaction is mainly performed, and abnormal denitrifying bacteria on the inner layer are dominant, and the denitrifying reaction is mainly performed. In addition to activated sludge flocculation, dissolved oxygen gradients can also be present in the biofilm of a certain thickness, so that the inner layer of the biofilm forms an anoxic microenvironment.
Both nitrite and nitrate are autotrophic bacteria that utilize CO 2 、CO 3 2- 、HCO 3 - An equal carbon source by NH 3 、NH 4 + Or NO 2 - Is energy-derived by oxidation-reduction reaction. They use the original carbon source in the sewage to greatly reduce COD content in the sewage.
The two stages of nitrification and denitrification are completed in the same reactor, so that the process flow can be simplified; the additional carbon source required in the denitrification process can be saved, and meanwhile, the acidity generated by the nitrification can be partially neutralized by the alkalinity generated by the denitrification, so that the treatment cost is reduced; the hydraulic retention time can be shortened, and the volume and the occupied area of the reactor are reduced; only ammonia nitrogen is oxidized into nitrite, so that the air supply amount is reduced, and the energy consumption is reduced.
(1) Single-side aeration
In the embodiment, a single-side aeration mechanism is arranged in the short-cut nitrification and denitrification tank.
In the prior art, the aeration mode is mostly intermittent aeration, namely, the change of the content of dissolved oxygen in water is controlled by controlling the starting and stopping time of an aeration device. And after a large amount of aeration, the concentration of oxygenated dissolved oxygen in the water rises to form an aerobic environment, and after a certain time, the aeration device is closed, and the concentration of the dissolved oxygen in the water falls to form an anoxic environment. Thus forming an aerobic and anoxic zone of the tank body and providing reaction conditions for the short-cut nitrification and denitrification process.
The nitrifying pond according to the utility model uses a continuous single-side aeration mode to control the content of dissolved oxygen in water. An aerobic circulation zone appears in the water through a single-side aeration device, and the anaerobic zone at the other side is influenced by aeration circulation to maintain an anoxic state. The reaction process does not need to control the aeration time length. The aeration quantity is controlled, the aeration duration is not required to be controlled in the reaction process, and the content of the dissolved oxygen in the water can be accurately controlled in a single-side aeration mode.
(2) Biological filler: polyurethane double-ball filler
In this embodiment, a biological filler is disposed in the short-cut nitrification and denitrification tank, and the biological filler is polyurethane double-ball filler.
The biological filler is made of polyurethane filler, is formed by injection molding of polypropylene material in a double-ball form, is an inner-outer double-layer sphere, is a hollow netty sphere on the outer part, and is a sphere which comprises the polyurethane filler and can move relative to the outer part on the inner part. The biological filler mainly plays a role of a biological carrier. The term "biological carrier" refers to a carrier on which microorganisms adhere and aggregate. The biological filler has the characteristics of large specific surface area and high porosity, thereby being capable of adsorbing suspended matters. In addition, the biological filler has the characteristics of strong biological adhesive force, good chemical and biological stability, durability, no harmful substances dissolution, no secondary pollution, ultraviolet resistance, ageing resistance, strong hydrophilic performance and the like.
Under the aeration effect, the polyurethane double-ball filler can inhibit the formation of a biological film on the surface, so that an aerobic zone and an internal anoxic zone are formed on the surface of the double-ball filler, and the synchronous nitrification and denitrification reaction space is increased. The bio-filler according to the present utility model may be any suitable polyurethane dual ball filler known in the art. For example, polyurethane double sphere fillers having an outer diameter of between 5.5cm and 10.5 cm.
The specific process steps are as follows:
biological filler-polyurethane double-ball filler is added into the reaction tank, compressed air is introduced into the reaction tank through single-side aeration, and the aeration quantity is controlled. The water body and the biological filler form circulation under the action of bubbles, an aerobic zone (DO=1-2 mg/L) and an anoxic zone (DO=0.2-0.5 mg/L) environment exist in the tank body at the same time, and when sewage flows through the water outlet of the treatment tank body from the water inlet, pollutants in the water are adsorbed and decomposed by microorganisms attached to the biological filler, anaerobic and aerobic micro-reaction spaces inside the filler are more fully contacted with the pollutants, so that the synchronous nitrification and denitrification biological denitrification effects are enhanced.
The polyurethane double-ball filler can form a concentration gradient with high surface DO and low internal DO so as to form different dissolved oxygen conditions, thereby creating necessary conditions for synchronous nitrification and denitrification and enabling the conditions to occur simultaneously in the same reactor. The synchronous nitrification and denitrification can greatly reduce the reaction time and the volume of the reactor, and improve the total nitrogen removal effect of ammonia nitrogen.
The sewage enters an anaerobic stage to carry out denitrification and simultaneously, the hydrolytic acidification releases phosphorus, the COD in the water is reduced, the organic matters in the sewage are removed, and the biodegradability of the sewage is improved. The microorganism absorbs phosphorus in the anoxic stage, and the macromolecular organic matters are decomposed into small molecular organic particles, which is an important step for dephosphorization in sewage treatment. The aerobic stage is largely aerated to enable microorganisms to grow and reproduce in a large quantity, the activated sludge is subjected to aerobic respiration to further decompose organic matters, and after pollutants are removed, sewage enters a mud-water separation stage. The generated nitrified liquid flows back into the front-end treatment section through the gas stripping device, and sufficient microbial community and dissolved oxygen content are provided for the front-end treatment section.
Dynamic biological filter membrane separation tank
In the embodiment, a dynamic biological filter membrane separator is arranged in the dynamic biological filter membrane separation tank, and the upper end of the dynamic biological filter membrane separator is connected with a self-priming pump. As shown in fig. 2, the center of the dynamic biological filter separator is provided with two guide plates perpendicular to the bottom, and the distance between the guide plates is 5mm to 25 mm; the outer side surfaces of the guide plates are respectively provided with a supporting layer at intervals, and carrier fibers fixed through ultrasonic welding are arranged on the supporting layers.
In other embodiments, more than two baffles may be provided, the number of particular baffles being determined by baffle size, sewage suspension concentration, design membrane flux.
The carrier fiber in this example is made of hydrophilically modified ABS fiber. The modified ABS fiber has the filtering precision of 5-20 mu m, is more suitable for the adhesion of activated sludge flocs due to the hydrophilic property, and is beneficial to the formation of biological filter membranes.
When the self-priming pump operates, sewage enters the dynamic biological filter membrane separator from the outer side of the supporting layer and flows along the guide plate, and the sewage filtered by the dynamic biological filter membrane separator is conveyed to the anaerobic ammonia oxidation tank by the self-priming pump.
The specific process steps are as follows:
the sewage to be treated is dosed with a quantitative porous powder, in this example with activated carbon powder (in some examples 100-300 mesh, in some specific examples 200 mesh, in an amount of 0.2kg/m 3 ) As a base core of the activated sludge, quorum sensing bacteria (0.1 kg/m 3 ) Regulating and controlling the microbial population behaviors. After a period of time (forming time is 4-7 days), the activated sludge in the sewage is polymerized into larger flocs by taking activated carbon particles as the center, namely activated sludge flocs. These activated sludge flocs adhere to the carrier fibers and form a high-precision biological filter. After the biological filter film is accumulated to a sufficient thickness, the aeration device is started, and the generated gas can separate the too thick biological filter film from the outer side of the supporting layer of the separator and destroy the floc structure of the biological filter film. The original activated carbon powder can be separated by aerating the biological filter membrane, the activated sludge can participate in the polymerization process of activated sludge flocs again, and the separator forms a new biological filter membrane again, so that the manual controllable dynamic balance of the biological filter membrane separator is realized.
Controlling aeration quantity and keeping the air-water ratio at 8-10. In practical sewage treatment cases, the suspended matter (Suspended Substance, SS) removal rate in the dynamic biological filter membrane separation tank reaches over 96 percent. The filtration flux can be maintained at 250L/m over 35 days of continuous operation without any washing 2 About hr, the effluent suspension was stable at 5mg/L or less and had no tendency to drop.
The activated sludge flocs on the surface of the biological filter membrane can participate in biochemical reaction while being filtered, so that pollutants in water can be effectively trapped and degraded.
In this embodiment, a reflux device for leading out sludge from the dynamic biological filter membrane separation tank to the short-cut nitrification and denitrification tank is arranged between the dynamic biological filter membrane separation tank and the short-cut nitrification and denitrification tank. Therefore, the separator does not need to be additionally cleaned, so that the permeability of the biological filter membrane is prevented from continuously reducing along with the extension of the service time, the mud-water separation effect is ensured, and the biodegradability of the sewage in the rear-end anaerobic ammonia oxidation tank is improved.
The utility model utilizes the principle of biological quorum sensing, namely that bacteria can regulate the gene expression dependent on cell density through the generation of an Autoinducer (AI), thereby regulating the physiological characteristics of bacterial population. When the microbial population density in the environment reaches a threshold value, the concentration of the signal molecules reaches a certain level, and the signal is induced or promoted to be finally transferred into cells through the signal transfer of related proteins including receptor proteins, so that the expression of specific genes is influenced, and the physiological characteristics of the microbial population are regulated. The quorum sensing technology is applied to a dynamic filter membrane solid-liquid separation process and an anaerobic ammonia oxidation process, so that the artificial controllable microbial population behavior is realized, and the good sewage treatment effect is improved and ensured.
Anaerobic ammoxidation tank
In this embodiment, a silicon-carbon filler is disposed in the anaerobic ammonia oxidation tank, and the microorganism forms particle-like sludge on the basis of the silicon-carbon filler. The silicon carbon filler is granular, takes the silicon carbon filler as a core, and microorganisms form biological films in the silicon carbon filler and on the surface of the silicon carbon filler, so that the silicon carbon filler adsorbed with the microorganisms becomes granular sludge, which is one type of activated sludge. By utilizing the advantages of the biological film technology and the activated sludge technology, the silicon-carbon filler improves the microbial population density and the sludge sedimentation performance under the condition of not increasing the sludge concentration; hydroxyl ions can be released in the reaction process, so that symbiosis of nitrobacteria and anaerobic ammonia oxidizing bacteria can be realized, and alkali metal in the filler can absorb phosphorus elements in water to be converted into stable complex. The denitrification and dephosphorization effect of the sewage is improved, and 62.5 percent of oxygen supply and 50 percent of alkali consumption can be saved.
After the sewage is subjected to front-end biochemical treatment and partial COD and ammonia nitrogen are reduced, the concentration of suspended matters is reduced to below 5mg/L after the sewage is separated by a dynamic biological filter membrane, and a foundation is laid for the growth of bacteria in anaerobic ammonia oxidation.
The specification parameters of the silicon carbon filler in this example are shown in table 1 below:
TABLE 1 specification parameters of silicon carbon fillers
| Bulk density of | 0.7～1.1g/cm 3 |
| Specific surface area | >7×104cm 2 /g |
| Cylinder pressure intensity | >6 |
| Uniformity coefficient (K60) | 1.33 |
| Void fraction | >40％ |
| Water absorption rate | >10％ |
| Mud content | <1％ |
| Sum of crushing rate and grinding rate | <6％ |
| Apparent density of | 1.2～1.8g/cm 3 |
The specific process steps are as follows:
in the embodiment, an aeration mechanism is arranged at the bottom of the anaerobic ammonia oxidation tank. The anaerobic ammonia oxidation tank is intermittently aerated to make suspended active sludge in aerobic state to accumulate nitrite and the added Si-C stuffing to regulate the C/N ratio of sewage to 1-3. The surface and the inner biological filter membrane of the filler are in an anaerobic state, and an environment for stably increasing the value of two microorganisms, namely AOB (ammonia oxidizing bacteria) and AnAOB (anaerobic ammonia oxidizing bacteria) is created.
Microorganisms adhere to the periphery of the particle filler to form particle-like sludge, and stable anaerobic ammonia oxidation reaction is generated through the synergistic effect of the two microorganisms of AOB and AnAOB, and nitrite is used as an electron acceptor in the anaerobic ammonia oxidation reaction under the condition of low carbon source to directly convert ammonia nitrogen into nitrogen.
Under the action of active bacteria, part of organic matter is decomposed into micromolecular organic matter, and then is oxidized and decomposed into CO 2 、H 2 Inorganic substances such as O; the other part is synthesized as cells. Under the condition of low sludge load, the cell is taken as a part of nutrient under the action of active bacteria to be decomposed into micromolecular organic matters, and then is oxidized and decomposed into CO 2 、H 2 Inorganic substances such as O; the other part is again synthesized as new cells. And so on, under the condition of low sludge load, the new cells are further used as nutrients to continue to decompose and metabolize under the action of active bacteria until the cells are finally metabolized into CO 2 、H 2 Inorganic substances such as O. From the whole process of decomposition and anabolism, the organic matters are completely metabolized, and the organic sludge in the system is not enriched and increased.
The low sludge load (F/M) ratio in the influent will cause the sludge in the in-tank biochemical system to be in a highly endogenous respiratory phase, and the incoming system organic matrix is eventually metabolized by endogenous respiration into carbon dioxide, water and small amounts of inorganic salts. In the treatment process, part of COD is converted into new activated sludge, and part of aged sludge is digested and mineralized, so that the automatic digestion and degradation balance of sludge are realized, the organic sludge is greatly reduced, the residual activated sludge is greatly reduced, and the treatment difficulty of the residual sludge is facilitated to be relieved.
The anaerobic ammonia oxidation pond is mainly an improvement on an IFAS (Integrated Fixed-Film Activated Sludge, namely Fixed biological film-activated sludge, specifically, by adding specially treated filler, the suspended activated sludge in water and the Fixed biological film on the surface of the filler coexist and play a role), so as to realize symbiosis of nitrobacteria and anaerobic ammonia oxidation bacteria, and the ammonia nitrogen removal rate is further improved. The optimal growth pH range of AnAOB is 6.7-8.3, the optimal growth temperature range is 30-37 ℃, and the AnAOB has long proliferation time and high requirements on conditions such as carbon nitrogen ratio, dissolved oxygen and the like, and can be influenced by inhibitors and toxic substances, so that the method for improving the sewage concentration, such as concentration or mixing high-concentration wastewater, is beneficial to the realization of anaerobic ammonia oxidation.
The anaerobic ammonium oxidation tank according to the present utility model requires only two processes to complete the anaerobic ammonium oxidation denitrification: the first process is partial nitrosation, in which about 55% of the ammonia nitrogen needs to be converted to nitrite nitrogen; the second process is an anaerobic ammoxidation reaction process in which ammonia nitrogen is oxidized by anaerobic ammoxidation bacteria under anaerobic conditions, wherein nitrite nitrogen produced in the first process acts as an electron acceptor. In the whole process, about 89% of inorganic nitrogen is converted into nitrogen, and the other 11% of inorganic nitrogen is converted into nitrate nitrogen, so that compared with the traditional nitrification and denitrification process, the anaerobic ammonia oxidation process has great technical advantages, and the aeration energy consumption is only 55% -60% of that of the traditional process; the process almost does not need a carbon source, even if the carbon source is required to be added in the anaerobic ammoxidation process for removing the nitrate product, the adding amount of the process is 90% lower than that of the traditional process; anaerobic ammoxidation processes can reduce 45% of the alkalinity consumption. Meanwhile, the sludge yield of the anaerobic ammonia oxidation process is far lower than that of the traditional denitrification process, and the treatment and disposal costs of the residual sludge are remarkably reduced.
Example two Process applications
The embodiment of the utility model runs in Yongkang city at 200m3/d integrated domestic sewage equipment, and mainly illustrates the process of short-cut nitrification and denitrification, dynamic biological filter membrane separation, anaerobic ammonia oxidation and water discharge.
The sewage sequentially passes through a short-cut nitrification and denitrification tank, a dynamic biological filter membrane separation tank and an anaerobic ammonia oxidation tank and then is discharged. After 35 days of operation of the apparatus, the total nitrogen removal rate was 88.0%, the suspended matter (Suspended Substance, SS) removal rate was 96.8%, the effluent SS was 3.7mg/L, and the various parameters were varied as shown in Table 2 below:
table 2 change of water quality parameters after 35 days of operation of the combined process unit
| Parameters (parameters) | Inflow of water | Effluent water | |
| 1 | COD(mg/L) | 298 | 26 |
| 2 | Total phosphorus (mg/L) | 3.42 | 0.65 |
| 3 | Ammonia nitrogen (mg/L) | 89 | 1.4 |
| 4 | Total nitrogen (mg/L) | 113 | 13.6 |
| 5 | pH | 7.5 | 8.2 |
| 6 | SS(mg/L) | 216 | 6.88 |
The combined equipment provided by the utility model has the advantages of simple structure and low cost. The short-cut nitrification and denitrification tank, the dynamic biological filter membrane separation tank and the anaerobic ammonia oxidation tank which are sequentially connected are used for treating sewage with high ammonia nitrogen and low COD, can achieve high-efficiency deep denitrification, simultaneously reduce COD and total phosphorus in the sewage, ensure good solid-liquid separation effect, and optimize the effect of effluent indexes. Wherein, the synchronous nitrification and denitrification of the short-cut nitrification and denitrification tank can greatly reduce the reaction time and the volume of the reactor, and improve the total nitrogen removal effect of ammonia nitrogen; the biological filter membrane in the dynamic biological filter membrane separation tank is combined with the supporting layer to form a composite filter system, so that microorganism solids and other suspended matters can be effectively trapped, and the balance of the dynamic biological filter membrane can be realized; in the anaerobic ammonia oxidation tank, an AOB and AnAOB microorganism stable value-added environment is created through the particle-like sludge, so that ammonia nitrogen can be directly converted into nitrogen, and the effect of deep denitrification is achieved.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (17)
1. A combination for wastewater treatment, the combination comprising:
the device comprises a short-cut nitrification and denitrification tank, a dynamic biological filter membrane separation tank and an anaerobic ammoxidation tank which are connected in sequence, wherein a dynamic biological filter membrane separator is arranged in the dynamic biological filter membrane separation tank.
2. The combination as claimed in claim 1, wherein the bottom of the short-cut nitrification and denitrification tank is provided with an aeration mechanism.
3. The combination of claim 2, wherein the aeration mechanism is a single-sided aeration mechanism.
4. The combination as claimed in claim 1, wherein a biological filler is provided in the short-cut nitrification and denitrification tank.
5. The combination of claim 4, wherein the biologic filler is a polyurethane dual sphere filler.
6. The combination as claimed in claim 1, wherein a pump is connected to the upper end of the dynamic biofilter membrane separator, and a reflux device for leading out sludge from the dynamic biofilter membrane separator to the short-cut nitrification and denitrification tank is provided between the dynamic biofilter membrane separator and the short-cut nitrification and denitrification tank.
7. The combination of claim 6, wherein the pump is a self priming pump.
8. The combination device as claimed in claim 1, wherein the center of the dynamic biological filter separator is provided with at least two guide plates, the guide plates are assembled in a flat plate membrane mode, and the outer side surfaces of the guide plates are respectively provided with a supporting layer at intervals; the support layer is provided with carrier fibers fixed by ultrasonic welding.
9. The combination as claimed in claim 8, wherein the dynamic biofilm separator is centrally provided with two baffles, and the distance between the baffles is between 5mm and 25 mm.
10. The combination of claim 8, wherein the carrier fiber is made of any one of ABS, PE, PVC fibers, the carrier fiber having been hydrophilically modified.
11. The combination of claim 8, wherein a layer of biological filter is provided on the outside of the support layer, the biological filter being formed from activated sludge flocs.
12. The combination of claim 11, wherein the matrix of the activated sludge flocs is a porous powder and quorum sensing bacteria form the activated sludge flocs on the basis of the porous powder.
13. The combination of claim 12, wherein the porous powder is activated carbon powder, diatomaceous earth, or silica, and the porous powder has a particle size of 100 to 300 mesh.
14. The combination of claim 1, wherein a silica-carbon filler is disposed within the anaerobic ammoxidation tank, and wherein microorganisms form a particle-like sludge based on the silica-carbon filler.
15. The combination of claim 14, wherein the silicon carbon filler is particulate and the silicon carbon filler has a porosity of greater than 40%.
16. The combination of claim 14, wherein the microorganisms are AOB-type and AnAOB-type microorganisms.
17. A combination according to any one of claims 1, 14 to 16, wherein the bottom of the anaerobic ammoxidation cell is provided with an aeration mechanism.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223296905.7U CN219429820U (en) | 2022-12-06 | 2022-12-06 | Combined equipment for sewage treatment |
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| CN202223296905.7U CN219429820U (en) | 2022-12-06 | 2022-12-06 | Combined equipment for sewage treatment |
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