CN117263390B - Biochemical treatment method for high-COD (chemical oxygen demand) high-ammonia-nitrogen wastewater - Google Patents
Biochemical treatment method for high-COD (chemical oxygen demand) high-ammonia-nitrogen wastewater Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000001301 oxygen Substances 0.000 title description 11
- 229910052760 oxygen Inorganic materials 0.000 title description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title description 10
- 239000000126 substance Substances 0.000 title description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
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- 239000010802 sludge Substances 0.000 claims abstract description 18
- 241000894006 Bacteria Species 0.000 claims abstract description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 7
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- 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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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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 relates to a biochemical treatment method of high COD and high ammonia nitrogen wastewater, which comprises the following steps: (1) The wastewater enters a buffer tank for buffering and tempering, then enters an anaerobic tank for hydrolyzing and acidifying the refractory organic matters; (2) One part of effluent of the anaerobic tank is input into the first-stage AO device, and the other part is input into the third-stage AO device; the first-stage AO device, the second-stage AO device, the third-stage AO device, the fourth-stage AO device and the fifth-stage AO device are sequentially connected in series; (3) The effluent of the fifth-stage AO device enters a sedimentation tank for mud-water separation, and the sludge in the sedimentation tank flows back to an anaerobic tank; (4) The effluent of the sedimentation tank enters a denitrification filter tank, and denitrifying bacteria are utilized to denitrify nitrate which is not completely denitrified; and the produced water of the denitrification filter is discharged up to the standard.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a biochemical treatment method of high-COD (chemical oxygen demand) high-ammonia-nitrogen wastewater.
Background
In the field of industrial wastewater, biochemical treatment is rarely adopted for wastewater containing high-concentration organic matters, high ammonia nitrogen and high salt at present, because the biodegradability of the wastewater is poor, the requirement for the microorganism of the biochemical treatment is high, the produced sludge is large, special salt-tolerant strains need to be cultured, in addition, the impact load resistance of a biochemical treatment system is weak, the system is easy to crash, and a large number of microorganisms die. The wastewater is mainly treated by adopting a chemical advanced oxidation method, and the following problems exist in degradation of pollutants in the wastewater: (1) The preparation cost of the oxidation reaction is high, the oxidation reaction is not renewable, and the treatment cost is high; (2) After the wastewater is subjected to chemical oxidation treatment, the treatment effect on organic matters is better, the treatment effect on ammonia nitrogen is poorer, and biochemical treatment procedures are generally connected in series.
Therefore, the existing high-pollution organic matter high-salt high-ammonia-nitrogen wastewater is relatively difficult to treat, and because the wastewater has complex components and contains a plurality of compounds which are difficult to be degraded by microorganisms or have biotoxicity, the COD of the wastewater is relatively high, and the common activated sludge method is used for easily inhibiting the growth of nitrifying bacteria, so that the ammonia nitrogen removal rate is relatively low. When the fluctuation of the wastewater quality is large, the treatment difficulty is reduced more.
Disclosure of Invention
Aiming at the problems, the invention provides a biochemical treatment method of high COD and high ammonia nitrogen wastewater, which comprises the following steps:
(1) The wastewater enters a buffer tank for buffering and tempering, then enters an anaerobic tank for hydrolyzing and acidifying the refractory organic matters;
(2) One part of effluent of the anaerobic tank is input into the first-stage AO device, and the other part is input into the third-stage AO device;
the first-stage AO device, the second-stage AO device, the third-stage AO device, the fourth-stage AO device and the fifth-stage AO device are sequentially connected in series;
(3) The effluent of the fifth-stage AO device enters a sedimentation tank for mud-water separation, and the sludge in the sedimentation tank flows back to an anaerobic tank;
(4) The effluent of the sedimentation tank enters a denitrification filter tank, and denitrifying bacteria are utilized to denitrify nitrate which is not completely denitrified; and the produced water of the denitrification filter is discharged up to the standard.
Optionally, in step (2), the first-stage AO device includes a first anoxic tank and a first aerobic tank which are sequentially connected, the second-stage AO device includes a second anoxic tank and a second aerobic tank which are sequentially connected, the third-stage AO device includes a third anoxic tank and a third aerobic tank which are sequentially connected, the fourth-stage AO device includes a fourth anoxic tank and a fourth aerobic tank which are sequentially connected, and the fifth-stage AO device includes a fifth anoxic tank and a fifth aerobic tank which are sequentially connected;
the water outlet of the anaerobic tank is simultaneously connected with the water inlet of the first anoxic tank and the water inlet of the third anoxic tank, the water outlet of the upper-stage aerobic tank is connected with the water inlet of the lower-stage anoxic tank, the water inlet of the third anoxic tank is also connected with the water outlet of the second aerobic tank, and the water outlet of the fifth aerobic tank is connected with the sedimentation tank.
In the invention, the waste water enters an anaerobic tank after being buffered and conditioned, and mainly hydrolyzes and acidizes organic matters which are difficult to degrade. The effluent of the anaerobic tank enters the subsequent AO units at multiple points, so that carbon sources can be reasonably distributed, and denitrifying bacteria can be combined with organic substances to complete denitrification. Specifically, the effluent of the anaerobic tank is divided into two parts, and the two parts respectively enter a first anoxic tank of the first-stage AO device and a third anoxic tank of the third-stage AO device; the effluent of the first part sequentially passes through a five-stage AO device to complete denitrification-nitrification; the effluent of the second part directly enters the AO device of the third stage, and mainly supplements carbon sources for the AO devices of the third stage and later, so that the denitrifying bacteria are ensured to have sufficient available carbon sources.
The front two-stage AO device is mainly used for removing COD of wastewater so as to reduce the COD load of an aerobic tank of a subsequent AO device, reduce the COD volume load of the subsequent aerobic tank, provide favorable conditions for nitrifying bacteria growth and enable the AO system to perform nitrifying reaction more efficiently. The last three aerobic tanks are used for efficiently nitrifying under lower COD load so as to remove ammonia nitrogen and provide nitrate for denitrification reaction. The first anoxic tank utilizes organic matters, nitrate and nitrite in the wastewater to perform denitrification, so as to generate alkalinity and supplement the requirement of the subsequent nitrification reaction. The four subsequent anoxic tanks mainly perform denitrification and convert the nitrate produced by the aerobic tank into nitrogen.
Further alternatively, the ratio of the amount of water entering the first stage AO device to the amount of water entering the third stage AO device in the anaerobic tank is (4-5): 1.
Further alternatively, the ratio of the residence time of the wastewater in the anaerobic tank, each anoxic tank and each aerobic tank is 1 (5-6): 12-14.
Further alternatively, the ratio of residence time of wastewater in the anaerobic tank to that of the denitrification filter is 1 (2-2.5).
Further alternatively, aeration devices are arranged in each anoxic tank and each aerobic tank, the anoxic tanks are used for pneumatic stirring, the dissolved oxygen of the anoxic tanks is 0.2-0.4mg/L, and the dissolved oxygen of the aerobic tanks is 5.0-6.0mg/L.
Optionally, in the step (3), a sludge bucket and a sludge pump are arranged at the bottom of the sedimentation tank, so that the sludge flows back to the front end of the anaerobic tank, the sludge of the biochemical system is supplemented, and the sludge reflux ratio is 200%.
Optionally, in the step (4), an intermediate water tank is arranged between the sedimentation tank and the denitrification filter, and supernatant fluid of the sedimentation tank is input into the intermediate water tank for standing, sedimentation and separation and temporary storage of water; the water outlet of the middle water tank is connected with the water inlet of the denitrification filter;
the sludge at the bottom of the middle water tank is completely returned to the anaerobic tank.
Optionally, in the step (4), the water outlet of the denitrification filter is connected with a water producing pool for temporarily storing produced water, and the produced water can be used as reuse water, for example, for backwashing the denitrification filter and the AO devices at each stage.
Optionally, the anoxic tank and the aerobic tank are internally provided with fillers, the fillers comprise a plurality of groups of movable fillers which are sequentially arranged from top to bottom, and each group of fillers comprises a movable filler plate above and a movable filler layer below;
the movable filler plate is integrally a telescopic frame plate and comprises a plurality of telescopic hollowed-out diamond-shaped frames which are mutually connected, and the surface of each diamond-shaped frame covers a first net and is used for loading microorganisms and intercepting microorganisms lost from the movable filler layer;
the movable filler layer is a telescopic frame body and comprises a plurality of telescopic quadrangular columns connected with each other, and flexible porous carriers are filled in the quadrangular columns and used for loading microorganisms.
Further optionally, the adjacent four prisms of the active filler layer share a column and a side, and the expansion directions of all the four prisms of the active filler layer are the same, for example, four vertexes of the four prisms are a first vertex, a second vertex, a third vertex and a fourth vertex in a clockwise direction, the second vertex and the fourth vertex can move towards a direction approaching to or separating from each other under the action of external force, and the first vertex and the third vertex move along with the expansion and contraction of the four prisms; the active filler layer narrows and stretches properly when all the quadrangular columns are compressed, and relaxes and shortens properly when all the quadrangular columns are stretched;
the top, bottom and side surfaces of each quadrangular prism are covered with a second net for making the quadrangular prism form a closed cavity for accommodating the inner flexible porous carrier.
Further optionally, the fully expanded area of the second net is not smaller than the areas of the top surface, the bottom surface and the side surfaces corresponding to the quadrangular prism, so that the second net is prevented from being broken when the quadrangular prism is expanded or contracted.
Further alternatively, the flexible porous carrier is a soft sponge, and the soft sponge has rich pore structures, large specific surface area and strong water absorption and is an ideal microorganism carrier;
when the active filler layer is started, the soft sponge is uniformly immersed into the carbon source solution before filling, so that the carbon source can be fully absorbed.
Because of the relatively low strength of the sponge, this is not the best choice for conventional microbial fillers or carriers and is therefore essentially no use. The inventor designs the quadrangular frame body structure of the movable filler layer, and then the quadrangular frame body structure is matched with a second net to form a good carrier accommodating cavity, so that the quadrangular frame body structure is matched with a soft sponge for use, and a large microorganism load capacity can be obtained.
Further optionally, the surface of the mesh of the second net is wound with a thread-like plant, the thread-like plant is selected from the root, stem and leaf of herbaceous plants, kelp, aquatic plants and fine and soft stems and leaves of woody plants, the slender thread-like plant is easy to wind on the mesh, and part of mesh area can be covered when the slender thread-like plant is irregularly wound, so that the microbial carrier can be used for providing nutrients for microorganisms and preventing soft sponge and microorganisms in the quadrangular prism from losing.
Further optionally, adjacent diamond-shaped frames of the movable filler plate share a side edge, the expansion directions of all the diamond-shaped frames of the movable filler plate are the same, for example, four vertexes of the diamond-shaped frames are a first point, a second point, a third point and a fourth point in a clockwise direction, the second point and the fourth point can move towards a direction approaching to or away from each other under the action of external force, and the first point and the third point move to positions in cooperation with the expansion and contraction of the diamond-shaped frames; when all the diamond-shaped frames are compressed, the movable filler plate is narrowed and properly elongated, and when all the diamond-shaped frames are stretched, the movable filler plate is widened and properly shortened;
the surface of each diamond-shaped frame is covered with a first net for enabling the movable filler plate to form a net plate with an interception function.
Further optionally, the area of the fully unfolded first net is not smaller than the area of the hollowed-out surface of the diamond, so that the first net is prevented from being broken when the diamond stretches or contracts.
Further optionally, the surface of the mesh of the first net is also wrapped around the strand-like plants for intercepting microorganisms, soft sponges, lost from the active filler layer, and the first net is capable of supporting a quantity of microorganisms.
The filler of the anoxic tank is loaded with anoxic microorganisms, and the filler of the aerobic tank is loaded with aerobic microorganisms. For the traditional plastic annular or spherical filler, the surface is smooth, the surface area is limited, and a long time is required for forming a biological film, namely the starting time is long, so that the biological film on the surface of the plastic filler is easily washed away by water flow in the subsequent biochemical treatment, and the biomass is lost. The invention designs the movable filler layer, the quadrangular prism frame body is internally filled with the small blocky soft sponge and is intercepted by the second net, the pores of the soft sponge are rich, sufficient space is provided for loading microorganisms, the hygroscopicity of the soft sponge is good, the carbon source solution can be fully absorbed before starting, a rich micro-reaction cavity is formed, the carbon source is locked in the sponge for a long time, the proliferation and the growth of microorganisms are promoted, and the starting time is shortened.
The COD concentration of the wastewater received by the first two-stage AO device is higher, and although the conventional domesticated salt-tolerant anoxic and aerobic microorganisms are used, the mortality rate of the microorganisms is higher, which is an unsolvable problem in the field. According to the invention, from another angle, when the anoxic tank or the aerobic tank runs for a longer time and the microorganisms in the soft sponge die more, the dead microorganisms can generate toxins and occupy the living space of the active microorganisms, and the more the soft sponge is close to the outer side, the more the soft sponge contacts the wastewater preferentially, and the more the dead microorganisms are. The quadrangular prism of the active filler layer is driven by external force to move in the same direction at the same time, for example, the second vertex and the fourth vertex move towards each other, the first vertex and the third vertex move to the positions in cooperation with the contraction of the quadrangular prism, and at the moment, all the quadrangular prisms are compressed, and the active filler layer is narrowed and properly stretched. The sponge is squeezed and the part of the impurities and dead microorganisms near the outside of the sponge are preferentially squeezed out, possibly accompanied by a very small amount of active microorganisms, and washed away by the flowing waste water. Then, the second apex and the fourth apex are moved in a direction away from each other, the first apex and the third apex are moved in position in cooperation with the stretching of the quadrangular prism, at which time all the quadrangular prisms are stretched, the active filler layer is relaxed and appropriately shortened, at which time the sponge swells to absorb water, and biochemical treatment is performed again. The process that the soft sponge is extruded can thoroughly update the water reaction environment in the sponge, and avoid the putrefaction in the sponge. If the active microorganisms of the active filler layer can not meet the wastewater treatment requirement after multiple times of extrusion, the active filler layer which is started in other tank bodies is replaced.
When the movable filler layer contracts and extrudes the sponge, the dirt in the inner part is extruded, the upper movable filler plate stretches, namely the second point and the fourth point move towards a direction away from each other under the action of external force, the first point and the third point move to positions in cooperation with the stretching of the diamond-shaped frames, at the moment, all the diamond-shaped frames are stretched, and the movable filler plate is widened and properly shortened. The first net intercepts impurities and microorganisms extruded by the active filler layer above or below, wherein the active microorganisms are loaded on the first net, dead microorganisms and the impurities have no adhesive force, and the dead microorganisms and the impurities can be quickly lost under the action of water flow; the first net also shrinks and sags due to the shrinkage of the movable filler plate, and dead microorganisms and impurities are lost under the action of water flow.
The movable filler layer and the movable filler plate can be arranged in the rear three-stage AO device, the filler form can be flexibly adjusted, dead microorganisms and impurities can be removed by extrusion, and the biochemical treatment efficiency is improved.
Drawings
FIG. 1 is a schematic flow chart of the biochemical treatment method of example 1;
fig. 2 is a schematic structural view of a movable packing board of embodiment 2;
fig. 3 is a schematic structural diagram of the active filler layer of embodiment 2.
In the drawing, a 1-movable filler plate, a 2-movable filler layer, 3-diamond-shaped frames, a 4-first net, a 5-second net and 6-quadrangular prisms are arranged.
Detailed Description
The following examples and pairsIn the proportion, the production wastewater from a certain chemical plant is treated, the water quality of the wastewater is COD of 238-4160mg/L, and NH 3 N is 56-222mg/L, TN is 67-392mg/L, pH is 6.0-9.8, water quality fluctuation is large, and irregular change is caused.
Example 1
The embodiment provides a biochemical treatment method of high-COD and high-ammonia nitrogen wastewater, as shown in figure 1, comprising the following steps:
(1) The wastewater enters a buffer tank for buffering and tempering for 2 days, then enters an anaerobic tank, and hydrolyzes and acidizes the refractory organic matters;
(2) One part of effluent of the anaerobic tank is input into the first-stage AO device, and the other part is input into the third-stage AO device;
the first-stage AO device, the second-stage AO device, the third-stage AO device, the fourth-stage AO device and the fifth-stage AO device are sequentially connected in series;
(3) The effluent of the fifth-stage AO device enters a sedimentation tank for mud-water separation, and the sludge in the sedimentation tank flows back to an anaerobic tank;
(4) The effluent of the sedimentation tank enters a denitrification filter tank, and denitrifying bacteria are utilized to denitrify nitrate which is not completely denitrified; and the produced water of the denitrification filter is discharged up to the standard.
In the step (2), the first-stage AO device comprises a first anoxic tank and a first aerobic tank which are sequentially connected, the second-stage AO device comprises a second anoxic tank and a second aerobic tank which are sequentially connected, the third-stage AO device comprises a third anoxic tank and a third aerobic tank which are sequentially connected, the fourth-stage AO device comprises a fourth anoxic tank and a fourth aerobic tank which are sequentially connected, and the fifth-stage AO device comprises a fifth anoxic tank and a fifth aerobic tank which are sequentially connected;
the water outlet of the anaerobic tank is simultaneously connected with the water inlet of the first anoxic tank and the water inlet of the third anoxic tank, the water outlet of the upper-stage aerobic tank is connected with the water inlet of the lower-stage anoxic tank, the water inlet of the third anoxic tank is also connected with the water outlet of the second aerobic tank, and the water outlet of the fifth aerobic tank is connected with the sedimentation tank.
The ratio of the water quantity entering the first-stage AO device to the water quantity entering the third-stage AO device in the anaerobic tank is 4:1.
The residence time ratio of the wastewater in the anaerobic tank, the anoxic tank and the aerobic tank is 1:5:12. Specifically, the effective residence time of the wastewater in the anaerobic tank is 6 hours, the total effective residence time in the five anoxic tanks is 30 hours, and the total effective residence time in the five aerobic tanks is 72 hours.
The residence time ratio of the wastewater in the anaerobic tank to the denitrification filter tank is 1:2, and the effective residence time of the wastewater in the denitrification filter tank is 12h.
Aeration devices are arranged in each anoxic tank and each aerobic tank, a blower and a gas flowmeter are connected with an aeration main pipe, the gas quantity is observed through the flowmeter, and the aeration quantity is manually adjusted through a manual adjusting valve. The oxygen-deficient pool is used for pneumatic stirring, the dissolved oxygen of the oxygen-deficient pool is 0.2-0.4mg/L, the dissolved oxygen of the aerobic pool is 5.0-6.0mg/L, and the dissolved oxygen of the anaerobic pool is 0.1mg/L.
In the step (3), a sludge bucket and a sludge pump are arranged at the bottom of the sedimentation tank, so that sludge flows back to the front end of the anaerobic tank, the sludge of the biochemical system is supplemented, and the sludge backflow ratio is 200%. The effective residence time of the wastewater in the sedimentation tank is 6h.
In the step (4), an intermediate water tank is arranged between the sedimentation tank and the denitrification filter, and supernatant fluid of the sedimentation tank is input into the intermediate water tank for standing, sedimentation and separation and temporary storage of water; the water outlet of the middle water tank is connected with the water inlet of the denitrification filter; the sludge at the bottom of the middle water tank is completely returned to the anaerobic tank, and the effective residence time of the wastewater in the middle water tank is 6h.
In the step (4), the water outlet of the denitrification filter is connected with a water producing tank for temporarily storing produced water, and the produced water can be used as reuse water, for example, for backwashing the denitrification filter and the AO devices at each level. The effective residence time of the wastewater in the denitrification filter is 12h.
Ceramsite filter materials are arranged in the denitrification filter, and the denitrification filter is backwashed with air and water for 30min for a week; and adding a carbon source into the upstream side of the denitrification filter to ensure that the total nitrogen reaches the standard. The anoxic tank and the aerobic tank are internally provided with conventional fillers, such as Raschig rings, and a contact oxidation method is adopted.
The water quality of the produced water is COD 220mg/L and NH 3 -N is 20The concentration of TN is 25mg/L, and the pH is 6.0-8.0.
Comparative example 1
The comparative example provides the biochemical treatment method of high COD and high ammonia nitrogen wastewater, which is the same as that of the embodiment 1, and is different in that in the step (2), all effluent of the anaerobic tank is input into the first-stage AO device and then sequentially passes through the subsequent AO devices at all stages.
Example 2
The biochemical treatment method of the high-COD and high-ammonia nitrogen wastewater provided by the embodiment is the same as that of the embodiment 1, and is characterized in that the inside of each anoxic tank and the inside of each aerobic tank are respectively provided with a filler, the filler comprises three groups of movable fillers which are sequentially arranged from top to bottom, and each group of fillers comprises an upper movable filler plate 1 and a lower movable filler layer 2 as shown in fig. 2-3;
the movable filler plate 1 is a telescopic frame plate, and comprises a plurality of telescopic hollowed-out diamond-shaped frames 3 which are mutually connected, wherein the surface of each diamond-shaped frame 3 is covered with a first net 4 for loading microorganisms and intercepting microorganisms lost from the movable filler layer 2;
the movable filler layer 2 is a telescopic frame body and comprises a plurality of telescopic quadrangular columns 6 which are mutually connected, and flexible porous carriers are filled in the quadrangular columns 6 and used for loading microorganisms.
The adjacent quadrangular columns 6 of the movable filler layer 2 share columns and sides, the telescopic directions of all the quadrangular columns 6 of the movable filler layer 2 are the same, four vertexes on the same section of the quadrangular columns 6 are a first vertex, a second vertex, a third vertex and a fourth vertex in a clockwise direction, the second vertex and the fourth vertex can move towards a direction approaching or separating from each other under the action of external force, and the first vertex and the third vertex move in a position matched with the zooming of the quadrangular columns 6; when all the quadrangular columns 6 are compressed, the active filler layer 2 is narrowed and properly elongated, and when all the quadrangular columns 6 are stretched, the active filler layer 2 is relaxed and properly shortened;
the top, bottom and side faces of each quadrangular prism 6 are covered with a second mesh 5 for making the quadrangular prism 6 form a closed cavity accommodating the inner flexible porous carrier.
The fully expanded area of the second net 5 is not smaller than the areas of the top surface, the bottom surface and the side surfaces corresponding to the quadrangular prism 6, so that the second net 5 is prevented from being broken when the quadrangular prism 6 is expanded or contracted.
The flexible porous carrier is soft sponge, and when the movable filler layer 2 is started, the soft sponge is uniformly immersed into a carbon source solution before filling, so that the carbon source can be fully absorbed, the capacity of the soft sponge is several times to tens times of that of the traditional rigid filler, and the soft sponge is favorable for quick starting; in addition, the active filler layer 2 can filter solid impurities in the wastewater during the biochemical treatment. The square prism 6 is filled with a block-shaped soft sponge, and the volume of the soft sponge is larger than the mesh aperture of the second net 5.
The surface of the net wires of the second net 5 are wound with silk-like plants, and the silk-like plants are roots, stems and leaves of herbaceous plants and aquatic weeds.
The adjacent diamond-shaped frames 3 of the movable filler plate 1 share a side edge, the expansion and contraction directions of all the diamond-shaped frames 3 of the movable filler plate 1 are the same, four vertexes of the same section of the diamond-shaped frames 3 are a first point, a second point, a third point and a fourth point in the clockwise direction, the second point and the fourth point can move towards a direction approaching or separating from each other under the action of external force, and the first point and the third point are matched with the expansion and contraction of the diamond-shaped frames 3 to move in position; when all the diamond-shaped frames 3 are compressed, the movable filler plate 1 is narrowed and properly elongated, and when all the diamond-shaped frames 3 are stretched, the movable filler plate 1 is widened and properly shortened;
the surface of each diamond 3 is covered with a first net 4 for the movable packing sheet 1 to form a net sheet with interception function.
The fully unfolded area of the first net 4 is not smaller than the area of the hollowed-out surface of the diamond-shaped frame 3, so that the first net 4 is prevented from being broken when the diamond-shaped frame 3 stretches or contracts.
The surface of the net wires of the first net 4 is also wound with the above-mentioned strand-like plants for intercepting microorganisms and soft sponge lost from the active filler layer 2, and the first net 4 can be loaded with a certain amount of microorganisms.
In the aerobic tank, a plurality of vertical auxiliary aeration pipes are arranged, the auxiliary aeration pipes are inserted into the diamond-shaped frames and the quadrangular corresponding to each other up and down, through holes are densely distributed on the side wall of the soft sponge area in the quadrangular corresponding to the auxiliary aeration pipes, the auxiliary aeration pipes are used for assisting in aeration to the sponge area, and gas passes through the porous structure of the sponge to form tiny bubbles so as to provide a micro-oxygen environment for the movable filler layer.
The water quality of the produced water is COD of 60mg/L and NH 3 The treatment effect is better than that of the embodiment 1, and the movable filler plate and the movable filler layer in the embodiment are beneficial to improving the biochemical treatment effect.
Claims (2)
1. The biochemical treatment method of the high COD and high ammonia nitrogen wastewater is characterized by comprising the following steps:
(1) The wastewater enters a buffer tank for buffering and tempering, then enters an anaerobic tank for hydrolyzing and acidifying the refractory organic matters;
(2) One part of effluent of the anaerobic tank is input into the first-stage AO device, and the other part is input into the third-stage AO device;
the first-stage AO device, the second-stage AO device, the third-stage AO device, the fourth-stage AO device and the fifth-stage AO device are sequentially connected in series;
(3) The effluent of the fifth-stage AO device enters a sedimentation tank for mud-water separation, and the sludge in the sedimentation tank flows back to an anaerobic tank;
(4) The effluent of the sedimentation tank enters a denitrification filter tank, and denitrifying bacteria are utilized to denitrify nitrate which is not completely denitrified; the produced water of the denitrification filter is discharged up to the standard;
in the step (2), the first-stage AO device comprises a first anoxic tank and a first aerobic tank which are sequentially connected, the second-stage AO device comprises a second anoxic tank and a second aerobic tank which are sequentially connected, the third-stage AO device comprises a third anoxic tank and a third aerobic tank which are sequentially connected, the fourth-stage AO device comprises a fourth anoxic tank and a fourth aerobic tank which are sequentially connected, and the fifth-stage AO device comprises a fifth anoxic tank and a fifth aerobic tank which are sequentially connected;
the water outlet of the anaerobic tank is simultaneously connected with the water inlet of the first anoxic tank and the water inlet of the third anoxic tank, the water outlet of the upper-stage aerobic tank is connected with the water inlet of the lower-stage anoxic tank, the water inlet of the third anoxic tank is also connected with the water outlet of the second aerobic tank, and the water outlet of the fifth aerobic tank is connected with the sedimentation tank;
the ratio of the water quantity of the anaerobic pool entering the first-stage AO device to the water quantity entering the third-stage AO device is (4-5) 1;
the residence time ratio of the wastewater in the anaerobic tank, the anoxic tank and the aerobic tank is 1 (5-6): 12-14;
the residence time ratio of the wastewater in the anaerobic tank to the denitrification filter tank is 1 (2-2.5);
the inside of the anoxic tank and the aerobic tank are respectively provided with a filler, the fillers comprise a plurality of groups of movable fillers which are sequentially arranged from top to bottom, and each group of fillers comprises a movable filler plate above and a movable filler layer below;
the movable filler plate is integrally a telescopic frame plate and comprises a plurality of telescopic hollowed-out diamond-shaped frames which are mutually connected, and the surface of each diamond-shaped frame covers a first net and is used for loading microorganisms and intercepting microorganisms lost from the movable filler layer;
the movable filler layer is a telescopic frame body and comprises a plurality of telescopic quadrangular columns which are mutually connected, and flexible porous carriers are filled in the quadrangular columns and used for loading microorganisms;
the adjacent quadrangular columns of the movable filler layer share columns and sides, the telescopic directions of all the quadrangular columns of the movable filler layer are the same, four vertexes on the same cross section of the quadrangular columns are a first vertex, a second vertex, a third vertex and a fourth vertex in the clockwise direction, the second vertex and the fourth vertex can move towards the directions close to or far from each other under the action of external force, and the first vertex and the third vertex move in position in cooperation with the zooming of the quadrangular columns; the active filler layer narrows and stretches properly when all the quadrangular columns are compressed, and relaxes and shortens properly when all the quadrangular columns are stretched;
the top surface, the bottom surface and the side surfaces of each quadrangular prism are covered with a second net, and the second net is used for enabling the quadrangular prisms to form a closed cavity for accommodating an internal flexible porous carrier which is a soft sponge;
the surface of the net silk of the second net is wound with silk-like plants selected from the group consisting of roots, stems and leaves of herbaceous plants, kelp, waterweed and fine and soft stems and leaves of woody plants;
the adjacent diamond-shaped frames of the movable filler plate share a side edge, the expansion and contraction directions of all the diamond-shaped frames of the movable filler plate are the same, four vertexes of the same section of the diamond-shaped frames are a first point, a second point, a third point and a fourth point in the clockwise direction, the second point and the fourth point can move towards a direction approaching or separating from each other under the action of external force, and the first point and the third point move in position in cooperation with the expansion and contraction of the diamond-shaped frames; when all the diamond-shaped frames are compressed, the movable filler plate is narrowed and properly elongated, and when all the diamond-shaped frames are stretched, the movable filler plate is widened and properly shortened;
the surface of each diamond-shaped frame is covered with a first net, and the first net is used for enabling the movable filler plate to form a net plate with an interception function;
the surface of the net wire of the first net is also wound with the strand-like plants for intercepting microorganisms and soft sponge which are lost from the active filler layer, and the first net can load a certain amount of microorganisms.
2. The biochemical treatment method of high-COD and high-ammonia nitrogen wastewater according to claim 1, wherein when the movable filler layer is started, the soft sponge is uniformly immersed in a carbon source solution before filling, so that the carbon source can be fully absorbed.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012010096A1 (en) * | 2010-07-20 | 2012-01-26 | 华南理工大学 | Device for synchronously removing nitrogen and phosphorus in mixed municipal sewage and fecal sewage by using a2/o-biomembrane and method thereof |
| CN110759593A (en) * | 2019-11-06 | 2020-02-07 | 中冶焦耐(大连)工程技术有限公司 | Process for treating coking wastewater by multistage A/O (anoxic/oxic) through sectional water inflow |
| CN111115818A (en) * | 2020-01-19 | 2020-05-08 | 李庆辉 | Synchronous nitrification and denitrification MBBR sewage treatment equipment and method |
| CN112374696A (en) * | 2020-11-09 | 2021-02-19 | 河北先河正合环境科技有限公司 | System and method for treating sewage by multistage multi-point water inflow enhanced denitrification |
-
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012010096A1 (en) * | 2010-07-20 | 2012-01-26 | 华南理工大学 | Device for synchronously removing nitrogen and phosphorus in mixed municipal sewage and fecal sewage by using a2/o-biomembrane and method thereof |
| CN110759593A (en) * | 2019-11-06 | 2020-02-07 | 中冶焦耐(大连)工程技术有限公司 | Process for treating coking wastewater by multistage A/O (anoxic/oxic) through sectional water inflow |
| CN111115818A (en) * | 2020-01-19 | 2020-05-08 | 李庆辉 | Synchronous nitrification and denitrification MBBR sewage treatment equipment and method |
| CN112374696A (en) * | 2020-11-09 | 2021-02-19 | 河北先河正合环境科技有限公司 | System and method for treating sewage by multistage multi-point water inflow enhanced denitrification |
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