CN110980950A - Vertical flow multistage A/O sewage treatment device and sewage treatment method thereof - Google Patents
Vertical flow multistage A/O sewage treatment device and sewage treatment method thereof Download PDFInfo
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- CN110980950A CN110980950A CN201911344952.4A CN201911344952A CN110980950A CN 110980950 A CN110980950 A CN 110980950A CN 201911344952 A CN201911344952 A CN 201911344952A CN 110980950 A CN110980950 A CN 110980950A
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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
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses a vertical flow multistage A/O sewage treatment device which comprises a box body, a water inlet pipeline, a water outlet pipeline and a sludge discharge port, wherein the interior of the box body is sequentially divided into at least two reaction zones and a precipitation zone by a partition plate, each reaction zone comprises an anoxic zone and an aerobic zone, and a water inlet and a valve are arranged in each anoxic zone. In addition, the invention also discloses a sewage treatment method, which comprises the following steps of (1) providing the vertical flow multistage A/O sewage treatment device; (2) introducing sewage into the box body through a water inlet pipeline, and sequentially entering different reaction zones; (3) the sewage enters different reaction zones according to a certain proportion by adjusting valves in anoxic zones of different reaction zones; (4) after the sewage reacts in different reaction zones, the sewage enters a settling zone; (5) clear water is discharged through a water outlet pipeline, and sludge is discharged through a sludge discharge port. The sewage treatment device and the sewage treatment method can obviously increase the removal rate of nitrogen and improve the effluent effect.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a vertical flow multistage A/O sewage treatment device and a sewage treatment method thereof.
Background
In the field of sewage treatment, various integrated equipment for small-sized scattered household type sewage treatment plants exist, the AA/O, MBBR process is taken as the main process, and the integrated equipment adopting the multi-stage A/O process is less.
The AA/O process comprises an anaerobic zone (A), an anoxic zone (A) and an aerobic zone (O). In the sewage treatment process, sewage flows through the anaerobic zone, the anoxic zone and the aerobic zone in sequence, and then is discharged after mud-water separation in the sedimentation tank. The mixed liquid in the aerobic zone needs to flow back to the anoxic zone to increase the TN removal effect, which is called internal reflux; the sludge in the sedimentation tank needs to flow back to the anaerobic zone to maintain the sludge concentration of the system, which is called external flow back.
The MBBR technology is that on the basis of the traditional AA/O technology and the like, a certain amount of suspension carriers are added in an aerobic zone, so that the biomass and the biological species in a reactor are improved. Such processes also require internal and external reflows.
As the sewage treatment mostly adopts AA/O, MBBR and other processes, internal reflux and external reflux are needed, and if the removal rate of total nitrogen is improved, the internal reflux ratio is generally about 200-300 percent, even higher, so the energy consumption is higher. In addition, as water is discharged after the first-stage reaction in the processes of AA/O, MBBR and the like, a water inlet carbon source is not well utilized, and the reflux of the mixed liquid with a high reflux ratio is easy to bring dissolved oxygen in an aerobic zone into an anoxic zone, so that the environment of the anoxic zone is damaged, and the removal efficiency of total nitrogen is limited.
The multistage A/O process is a process formed by connecting multistage anoxic (A)/aerobic (O) treatment units in series, inlet water is distributed into anoxic tanks in different sections according to a certain proportion, the process can obviously increase the removal rate of nitrogen, and the process has the advantages of good water outlet effect, investment saving, stable operation, flexible operation and the like.
Therefore, a multistage a/O sewage treatment apparatus and a sewage treatment method thereof capable of significantly increasing the removal rate of nitrogen and improving the effluent effect are urgently needed.
Disclosure of Invention
The invention aims to provide a vertical flow multistage A/O sewage treatment device which can obviously increase the removal rate of nitrogen and improve the water outlet effect.
Another object of the present invention is to provide a sewage treatment method in which the removal rate of nitrogen can be significantly increased and the effluent effect can be improved by using the above-described sewage treatment apparatus.
In order to achieve the purpose, the invention provides a vertical flow multistage A/O sewage treatment device which comprises a box body, a water inlet pipeline, a water outlet pipeline and a sludge discharge port, wherein the interior of the box body is sequentially divided into at least two reaction areas and a sedimentation area by a partition plate, each reaction area comprises an aerobic area and an anoxic area which are vertically arranged, and a water inlet and a valve are arranged in the anoxic area of the water inlet pipeline.
Preferably, the box is inside to be separated into first order reaction zone, second order reaction zone, third order reaction zone and fourth level reaction zone by the baffle, and first order reaction zone includes first order anoxic zone and first order aerobic zone, and the second order reaction zone includes second order anoxic zone and second order aerobic zone, and the third order reaction zone includes third order anoxic zone and third order aerobic zone, and the fourth order reaction zone includes fourth order anoxic zone and fourth order aerobic zone.
Preferably, two layers of partition boards are arranged between two adjacent reaction zones.
Preferably, a three-phase separator is arranged in the fourth-stage aerobic zone, and a three-phase separation zone is formed at the three-phase separator.
Specifically, the fourth stage reaction zone is adjacent to the first stage reaction zone.
Preferably, a gas stripping return pipe is arranged in the fourth-stage aerobic zone so as to return the sludge to the first-stage anoxic zone.
Preferably, an aeration device and a suspended filler are arranged in the aerobic zone.
The invention provides a sewage treatment method, which comprises the following steps:
(1) providing the vertical flow multistage A/O sewage treatment device;
(2) introducing sewage into the box body through a water inlet pipeline, and sequentially entering different reaction zones;
(3) the sewage enters different reaction zones according to a certain proportion by adjusting valves in anoxic zones of different reaction zones;
(4) after the sewage reacts in different reaction zones, the sewage enters a settling zone;
(5) clear water is discharged through a water outlet pipeline, and sludge is discharged through a sludge discharge port.
Specifically, the sewage sequentially passes through a first-stage reaction zone, a second-stage reaction zone, a third-stage reaction zone, a fourth-stage reaction zone and a three-phase separation zone.
Preferably, the sewage enters the first to fourth anoxic zones respectively in four sections, and the water inlet proportion from the first to fourth anoxic zones is 15-20%: 30% -35%: 25% -30%: 15 to 20 percent.
Preferably, the aeration device enables the dissolved oxygen of the first-stage aerobic zone to be greater than the dissolved oxygen of the second-stage aerobic zone and the dissolved oxygen of the third-stage aerobic zone to be greater than the dissolved oxygen of the fourth-stage aerobic zone.
Specifically, the dissolved oxygen amount of the first-stage aerobic zone is 2.6-3 mg/L, the dissolved oxygen amount of the second-stage aerobic zone is 2.1-2.5 mg/L, the dissolved oxygen amount of the third-stage aerobic zone is 1.6-2 mg/L, the dissolved oxygen amount of the fourth-stage aerobic zone is 1-1.5 mg/L, and the dissolved oxygen amounts of the first-stage anoxic zones to the fourth-stage anoxic zones are 0.1-0.5 mg/L.
Preferably, the sewage enters the first to fourth anoxic zones respectively in four sections, the sludge concentration in the first to fourth reaction zones decreases gradually, the sludge concentration in the first reaction zone is about 3300-.
Specifically, the volume-to-volume ratio of the first to fourth-stage reaction zones is from 0.8 to 1.2:1.3 to 1.7:1.2 to 1.4.
Preferably, the sludge in the fourth-stage aerobic zone flows back to the first-stage anoxic zone through the gas stripping return pipe, and the ratio of the return flow to the inflow flow is 1:1.
compared with the prior art, the invention has the beneficial effects that:
(1) better sewage treatment effect
The vertical flow arrangement mode, each level of reaction zone have respective specific sludge concentration and microbial community, can adapt to sewage quality better, effectively improve sewage treatment effect.
The inlet water enters each stage of anoxic zone in a segmented manner, so that sufficient carbon sources are provided for each stage of denitrification reaction, and additional carbon sources are not needed; the dissolved oxygen of each aerobic zone is at a lower concentration, and the dissolved oxygen gradually decreases, so that the anoxic environment of the anoxic zone is not influenced; the biological membrane in the suspended filler forms microscopic anaerobic, anoxic and aerobic biochemical functional areas to generate synchronous nitrification and denitrification reaction, thereby improving the denitrification efficiency of the whole system.
(2) No need of internal reflux with high reflux ratio, and low cost
For other processes, such as AA/O or MBBR, high reflux ratio internal reflux is needed to complete denitrification of nitrate nitrogen, and the higher the reflux ratio is, the higher the denitrification efficiency is, so that the running cost of the internal reflux is increased; the mixed liquid in the aerobic zone directly enters the next anoxic zone for denitrification, internal reflux is not needed, the energy consumption is reduced, and the operation is convenient.
(3) Strong impact load resistance
The invention combines the biomembrane method and the activated sludge method, the suspended filler is fully contacted with the water flow, the microbial biomass of the whole system and the contact time of the microbes and pollutants are improved, and meanwhile, the vertical flow mode of the device can ensure higher sludge concentration of each area and has higher adaptability to the impact of water quantity and water quality.
(4) Save floor space
The sedimentation in the device adopts a three-phase separator to be arranged in the aerobic zone, so that the occupied area of the traditional sedimentation zone is reduced.
Drawings
FIG. 1 is a floor plan of one embodiment of a vertical flow multi-stage A/O wastewater treatment plant of the present invention.
FIG. 2 is a process flow diagram of wastewater treatment according to the present invention.
Detailed Description
In order to explain technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings.
Referring to fig. 1 and 2, the present invention provides a vertical flow multistage a/O sewage treatment apparatus, which includes a tank 10, a water inlet pipe 6, a water outlet pipe 7 and a sludge discharge port 8. The interior of the box body 10 is sequentially divided into at least two reaction areas and a precipitation area by partition plates, the reaction areas comprise an aerobic area and an anoxic area which are arranged from top to bottom, and the water inlet pipe 6 is provided with a water inlet 61 and a valve 62 in the anoxic area.
Specifically, box 10 is inside to be separated into first order reaction zone 1 by the baffle, second level reaction zone 2, third level reaction zone 3 and fourth level reaction zone 4, first order reaction zone 1 includes first order anoxic zone 11 and first order aerobic zone 12, second level reaction zone 2 includes second order anoxic zone 21 and second order aerobic zone 22, third level reaction zone 3 includes third order anoxic zone 31 and third order aerobic zone 32, fourth level reaction zone 4 includes fourth level anoxic zone 41 and fourth level aerobic zone 42. More specifically, the interior of the tank 10 of the sewage treatment apparatus is divided into 9 zones, namely, a first-stage anoxic zone 11, a first-stage aerobic zone 12, a second-stage anoxic zone 21, a second-stage aerobic zone 22, a third-stage anoxic zone 31, a third-stage aerobic zone 32, a fourth-stage anoxic zone 41, a fourth-stage aerobic zone 42 and a three-phase separation zone (51, 52), by upper and lower partitions (partition 1a, partition 2a, partition 3a, partition 4a) and partitions (partition 1b, partition 1c, partition 2b, partition 2c, partition 3b, partition 3c) between the reaction zones of each stage. The anoxic zone and the aerobic zone in each stage of reaction zone are vertically arranged through clapboards (a clapboard 1a, a clapboard 2a, a clapboard 3a and a clapboard 4a) to form a vertical flow mode, and the clapboards (1a, 2a, 3a and 4a) are provided with water through holes. Preferably, two layers of clapboards are arranged between the adjacent reaction areas, such as the clapboards 1b and 1c, the clapboards 2b and 2c and the clapboards 3b and 3c, so that water flows downwards into the anoxic area of the next stage.
Preferably, an aeration device (not shown) and a suspended filler 91 are arranged in each aerobic zone of the sewage treatment device, namely, the bottom of each of the first-stage aerobic zone 12, the second-stage aerobic zone 22, the third-stage aerobic zone 32 and the fourth-stage aerobic zone 42 is provided with the aeration device and the suspended filler 91, and the suspended filler 91 can enable microorganisms to contact with water as much as possible due to suspended flow in the water while increasing the amount of the microorganisms in the system, so that the removal efficiency of pollutants is greatly improved. Preferably, the inlet water of the sewage treatment device enters each anoxic zone in a certain proportion, the inlet pipe 6 is provided with a water inlet 61 and a valve 62 in each anoxic zone, and the proportion of the inlet water is adjusted by adjusting the valve 62. Preferably, a three-phase separator is arranged in the fourth stage aerobic zone 42, the three-phase separator forms a three-phase separation zone, the three-phase separator comprises a bell-mouth air seal 52 and a precipitation zone 51, the air seal 52 enables bubbles generated by aeration to rise along the periphery of the air seal 52, the bubbles are prevented from stirring the upper precipitation zone 51, a mud-water mixture enters the upper precipitation zone 51 through a backflow seam between the air seal 52 and the precipitation zone 51, mud-water separation is realized in the precipitation zone 51, and the separated sludge flows back into the fourth stage aerobic zone 42 under the action of gravity. Specifically, the fourth-stage reaction zone 4 is adjacent to the first-stage reaction zone 1, a gas stripping return pipe 9 is arranged in the fourth-stage aerobic zone 42, sludge is returned to the first-stage anoxic zone 11 in a gas stripping mode, the standard clear water is discharged through a water outlet pipeline 7, and the redundant sludge is discharged through a sludge discharge port 8.
The invention provides a sewage treatment method, which comprises the following steps:
(1) providing the vertical flow multistage A/O sewage treatment device;
(2) introducing sewage into the box body 10 through the water inlet pipeline 6, and sequentially entering different reaction zones;
(3) the sewage enters different reaction zones according to a certain proportion by adjusting valves 62 in the anoxic zones of the different reaction zones;
(4) after the sewage reacts in different reaction zones, the sewage enters a settling zone 51;
(5) clear water is discharged through a water outlet pipeline 7, and sludge is discharged through a sludge discharge port 8.
Specifically, sewage enters the sewage treatment device through the water inlet pipeline 6 after being treated by the septic tank or the pretreatment, and then sequentially passes through the first-stage reaction zone 1, the second-stage reaction zone 2, the third-stage reaction zone 3 and the fourth-stage reaction zone 4, as shown by arrows in fig. 2, and after repeated nitrification and denitrification reactions, nitrogen and phosphorus removal of the sewage is realized. By adjusting the valve 62 of the water inlet pipe 6, the inlet water can enter each reaction zone in a certain proportion, and sufficient carbon sources are provided for denitrification reactions of all levels, so that the denitrification effect of the system is improved. Preferably, the sewage enters the first to fourth anoxic zones respectively in four sections, and the water inlet proportion from the first to fourth anoxic zones is 15-20%: 30% -35%: 25% -30%: 15 to 20 percent. Further, the sewage enters the first to fourth anoxic zones respectively in four sections, the sludge concentration in the first to fourth reaction zones is in a descending trend, the sludge concentration in the first reaction zone 1 is about 3300-. Specifically, the first stage sludge concentration is about 3300mg/L, the second stage sludge concentration is about 2600mg/L, the third stage sludge concentration is about 2200mg/L, and the fourth stage sludge concentration is about 2000mg/L, although the sludge concentration is not limited thereto.
Preferably, an aeration device is arranged below each aerobic zone, so that the dissolved oxygen of the first-stage aerobic zone 12 is greater than the dissolved oxygen of the second-stage aerobic zone 22 is greater than the dissolved oxygen of the third-stage aerobic zone 32 is greater than the dissolved oxygen of the fourth-stage aerobic zone 42. Specifically, the dissolved oxygen amount of the first-stage aerobic zone 12 is 2.6-3 mg/L, the dissolved oxygen amount of the second-stage aerobic zone 22 is 2.1-2.5 mg/L, the dissolved oxygen amount of the third-stage aerobic zone 32 is 1.6-2 mg/L, the dissolved oxygen amount of the fourth-stage aerobic zone 42 is 1-1.5 mg/L, and the dissolved oxygen amounts of the first-fourth-stage anoxic zones are 0.1-0.5 mg/L. By arranging the suspended filler 91 in the aerobic zone, a microscopic anaerobic, anoxic and aerobic alternate environment can be formed in the biomembrane constructed on the filler, thereby realizing synchronous nitrification and denitrification in the system. After four-stage biochemical reaction treatment, sewage enters a settling zone 51 of the three-phase separator, clear water is discharged from a water outlet pipeline 7, and sludge flows back to the first-stage anoxic zone 11 through a gas stripping return pipe to continue operation.
Further, the sludge in the fourth-stage aerobic zone 42 flows back to the first-stage anoxic zone 11 through the gas stripping return pipe, and the ratio of the return flow to the inflow flow is 1:1, namely the sludge reflux ratio is 100 percent. Specifically, the volume-to-volume ratio of the first to fourth-stage reaction zones is from 0.8 to 1.2:1.3 to 1.7:1.2 to 1.4. More specifically, the volume to capacity ratio of the first stage, second stage, third stage, and fourth stage is set to 1:1.5:1.3: 1.3.
In summary, compared with the prior art, the invention has the beneficial effects that:
(1) better sewage treatment effect
The vertical flow arrangement mode, each level of reaction zone have respective specific sludge concentration and microbial community, can adapt to sewage quality better, effectively improve sewage treatment effect.
The inlet water enters each stage of anoxic zone in a segmented manner, so that sufficient carbon sources are provided for each stage of denitrification reaction, and additional carbon sources are not needed; the dissolved oxygen of each aerobic zone is at a lower concentration, and the dissolved oxygen gradually decreases, so that the anoxic environment of the anoxic zone is not influenced; the biological membrane in the suspended filler forms microscopic anaerobic, anoxic and aerobic biochemical functional areas to generate synchronous nitrification and denitrification reaction, thereby improving the denitrification efficiency of the whole system.
(2) No need of internal reflux with high reflux ratio, and low cost
For other processes, such as AA/O or MBBR, high reflux ratio internal reflux is needed to complete denitrification of nitrate nitrogen, and the higher the reflux ratio is, the higher the denitrification efficiency is, so that the running cost of the internal reflux is increased; the mixed liquid in the aerobic zone directly enters the next anoxic zone for denitrification, internal reflux is not needed, the energy consumption is reduced, and the operation is convenient.
(3) Strong impact load resistance
The invention combines the biomembrane method and the activated sludge method, the suspended filler is fully contacted with the water flow, the microbial biomass of the whole system and the contact time of the microbes and pollutants are improved, and meanwhile, the vertical flow mode of the device can ensure higher sludge concentration of each area and has higher adaptability to the impact of water quantity and water quality.
(4) Save floor space
The sedimentation in the device adopts a three-phase separator to be arranged in the aerobic zone, so that the occupied area of the traditional sedimentation zone is reduced.
The above disclosure is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, so that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.
Claims (15)
1. The utility model provides a vertical multistage AO sewage treatment plant that flows, includes box, inlet channel, outlet conduit and row's mud mouth, its characterized in that, at least two reaction zones and sedimentation zone are separated into in proper order by the baffle to box inside, the reaction zone is including the aerobic zone and the anoxic zone of arranging from top to bottom, the inlet channel is in all be provided with water inlet and valve in the anoxic zone.
2. The vertical flow multistage A/O sewage treatment device according to claim 1, wherein the interior of the tank body is divided into a first-stage reaction zone, a second-stage reaction zone, a third-stage reaction zone and a fourth-stage reaction zone by partition plates, the first-stage reaction zone comprises a first-stage anoxic zone and a first-stage aerobic zone, the second-stage reaction zone comprises a second-stage anoxic zone and a second-stage aerobic zone, the third-stage reaction zone comprises a third-stage anoxic zone and a third-stage aerobic zone, and the fourth-stage reaction zone comprises a fourth-stage anoxic zone and a fourth-stage aerobic zone.
3. The vertical flow multistage a/O wastewater treatment plant of claim 2, wherein two layers of baffles are provided between two adjacent reaction zones.
4. The vertical flow, multi-stage A/O wastewater treatment plant of claim 2, wherein a three-phase separator is disposed within said fourth aerobic zone, said three-phase separator forming a three-phase separation zone.
5. The vertical flow, multi-stage A/O wastewater treatment plant of claim 2, wherein said fourth stage reaction zone is adjacent to said first stage reaction zone.
6. The vertical flow multi-stage A/O wastewater treatment plant of claim 5, wherein a gas stripping return conduit is provided within the fourth stage aerobic zone to return sludge into the first stage anoxic zone.
7. The vertical flow, multi-stage A/O wastewater treatment plant according to claim 1, wherein an aeration device and a suspended packing are provided within said aerobic zone.
8. A sewage treatment method comprises the following steps:
(1) providing a vertical flow multi-stage A/O wastewater treatment plant as claimed in any of claims 1-7;
(2) introducing sewage into the box body through the water inlet pipeline, and sequentially entering different reaction areas;
(3) the sewage enters different reaction zones according to a certain proportion by adjusting valves in anoxic zones of different reaction zones;
(4) after the sewage reacts in different reaction areas, the sewage enters the settling area;
(5) clear water is discharged through the water outlet pipeline, and sludge is discharged through the sludge discharge port.
9. The wastewater treatment method according to claim 8, wherein in the step (2), the wastewater passes through the first-stage reaction zone, the second-stage reaction zone, the third-stage reaction zone, the fourth-stage reaction zone and the three-phase separation zone in this order.
10. The sewage treatment method according to claim 9, wherein the sewage enters the first to fourth anoxic zones in four stages, and the water inlet ratio from the first to fourth anoxic zones is 15-20%: 30% -35%: 25% -30%: 15 to 20 percent.
11. The wastewater treatment method according to claim 9, wherein the aeration device is configured to cause the dissolved oxygen in the first-stage aerobic zone to be greater than the dissolved oxygen in the second-stage aerobic zone to be greater than the dissolved oxygen in the third-stage aerobic zone to be greater than the dissolved oxygen in the fourth-stage aerobic zone.
12. The sewage treatment method according to claim 11, wherein the dissolved oxygen amount in the first-stage aerobic zone is 2.6 to 3mg/L, the dissolved oxygen amount in the second-stage aerobic zone is 2.1 to 2.5mg/L, the dissolved oxygen amount in the third-stage aerobic zone is 1.6 to 2mg/L, the dissolved oxygen amount in the fourth-stage aerobic zone is 1 to 1.5mg/L, and the dissolved oxygen amounts in the first to fourth-stage anoxic zones are 0.1 to 0.5 mg/L.
13. The sewage treatment method as claimed in claim 9, wherein the sewage enters the first to fourth anoxic zones in four stages, the sludge concentration in the first to fourth reaction zones decreases gradually, the sludge concentration in the first reaction zone is about 3300-.
14. The wastewater treatment method according to claim 9, wherein the volume-to-volume ratio of the first to fourth-stage reaction zones is 0.8-1.2:1.3-1.7:1.2-1.4: 1.2-1.4.
15. The sewage treatment method of claim 9, wherein the sludge in the fourth-stage aerobic zone flows back to the first-stage anoxic zone through the gas stripping return pipe, and the ratio of the return flow to the water inlet flow is 1:1.
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Application publication date: 20200410 |