CN104609558B - A kind of short-cut nitrification and denitrification integrated A BR reactor - Google Patents

Abstract

The invention discloses an integrated ABR reactor for short-range nitrification and denitrification, which comprises a tank body (1), a main water inlet pipe (2), a first sub-water inlet pipe (3), a second sub-water inlet pipe (5), a biogas collecting Air pipe (8), microporous aeration pipe (9), ventilation pipe (10), return pipe (11) and water outlet pipe (14), described pool body (1) inside is from the first sub-inlet pipe (3) to The direction of the water outlet pipe (14) is successively the primary anaerobic zone, the micro-exposure short-range nitrification zone and the secondary anaerobic zone. The bottom of the reaction chamber of the micro-exposure short-range nitrification zone is equipped with microporous aeration pipes (9), each The upstream regions of each of the reaction chambers are provided with fillers (17). The invention can not only efficiently denitrify and denitrify, but also remove COD, and can effectively solve the problem of sludge loss, and is especially suitable for treating sewage with high load and high ammonia nitrogen.

Description

A short-range nitrification and denitrification integrated ABR reactor

technical field

The invention relates to a short-range nitrification and denitrification integrated ABR reactor, which belongs to the technical field of sewage treatment.

Background technique

The traditional denitrification process is to oxidize NH ₄ ⁺ into NO ₂ ^- , then into NO ₃ ^- in the nitrification process, and then through the denitrification process, denitrify NO ₃ ^- into NO ₂ ^- , and then denitrify into NO 2 - N ₂ . The short-range nitrification and denitrification technology is to control the nitrification process in the NO ₂ ^- stage and prevent the further oxidation of NO ₂ ^- to NO ₃ ^- , that is, to oxidize NH ₄ ⁺ to NO ₂ ^- first, and then directly denitrify from NO ₂ ^- to N ₂ . Compared with the traditional denitrification process, the short-cut nitrification and denitrification technology has the characteristics of reducing energy consumption, saving carbon sources, less sludge production, and less land occupation. It has great applications for wastewater with high nitrogen content and insufficient carbon sources. value.

Most of the current short-range nitrification and denitrification reactors focus on the research of SBR reactors. Since the SBR reactor is a sequencing batch reactor, it has a time-separated stage of aerobic, anaerobic, and anoxic stages, and a complete mixing stage in space, so it is more suitable for short-range nitrification and denitrification technology. However, the batch-type characteristics of SBR have also caused the shortcomings of high vacancy rate of processing equipment, high investment, and high degree of automation requirements. Some other reactors use CSTR (Completely Mixed Stirring Reactor) as a separate short-path nitrification reactor, which is connected to the rear A/O or other anaerobic reactors, which also has good results. However, when the concentration of COD in sewage is high, it is necessary to set up a pre-anaerobic reactor to treat COD first. This type of technology still has shortcomings such as complex equipment and difficult matching and control of hydraulic parameters.

ABR reactor (Anaerobic Baffled Reactor, anaerobic baffled reactor) is a new type of high-efficiency anaerobic reactor proposed by P.LMcCarty in the 1980s, known as the third-generation anaerobic reactor. Its characteristic is that a series of vertically placed baffles are set inside the reactor to divide the reactor into multiple reaction chambers connected in series, and each reaction chamber can be regarded as an independent UASB (upflow anaerobic sewage mud bed). Since the baffles are set in each reaction chamber, independent compartments are formed sequentially in the direction of water flow, so that the purpose of different microbial populations growing in different compartments is realized, thereby realizing the acid-producing phase and the production phase. The separation of the methane phase enables the reactor to have higher processing efficiency and stronger impact resistance. At the same time, because ABR has the advantages of separate compartments, not easily affected, the hydraulic retention time of each compartment can be set independently, and the overall structure is simple, if some of the compartments are set as micro-oxygen short-range nitrification chambers, it will not affect the rest The anaerobic cell is affected, and the effluent after nitrification flows to the anaerobic cell to carry out effective denitrification and denitrification. Therefore, the ABR reactor has the technical structure requirements required for short-cut nitrification and denitrification.

However, the traditional ABR reactor also has some deficiencies. For example, when the flow rate is fast, because the force of the water flow and the gas production in the same direction exist in the upper chamber, it is easy to cause the sludge in the cell to be lost, and the sludge The loss will destroy the bacteria and environment that should be fixed in each compartment, resulting in a reduction in the treatment efficiency of the reactor, and even inactivation of the bacteria in the reactor in severe cases. And if the flow rate is slow, the sludge loss will be contained to a certain extent, but it will make it difficult to stir the sludge in the lower layer of the reactor, so that the dead zone will increase, and the treatment efficiency of the reactor will be affected. At the same time, if the COD concentration of the influent is high (about 10,000 mg/L), the generated biogas will be violently disturbed, and the sludge will be easily lost. Therefore, it is necessary to provide an integrated ABR reactor that can effectively realize short-cut nitrification and denitrification and effectively reduce sludge loss.

Contents of the invention

The purpose of the present invention is to make up for the deficiencies of the prior art and provide an integrated ABR reactor for short-range nitrification and denitrification. The invention can not only effectively realize short-range nitrification and denitrification, but also effectively reduce sludge loss.

The technical scheme of the present invention to solve the above-mentioned technical problems is as follows: a short-range nitrification and denitrification integrated ABR reactor, including a tank body, a main water inlet pipe, a first sub-water inlet pipe, a second sub-water inlet pipe, a biogas collecting pipe, a microporous aeration Trachea, ventilation pipe, return pipe and water outlet pipe, the main water inlet pipe is connected to the waste water inlet, the first sub-water inlet pipe and the second sub-water inlet pipe are connected to the main water inlet pipe, and the interior of the pool body is arranged alternately There are a plurality of partitions perpendicular to the bottom of the cell body, which divide the interior of the cell body into a plurality of series and independent reaction chambers, and each reaction chamber has a baffle plate from top to bottom to separate it It is a downflow area and an upflow area. The upper part of the first reaction chamber of the pool body is provided with a water inlet tank, which is connected with the first water inlet pipe, and the upper part of the last reaction chamber is provided with a water outlet tank, which is connected with the water outlet pipe. It is characterized in that, from the first water inlet pipe to the water outlet pipe inside the pool body, there are first-level anaerobic zone, micro-exposure short-range nitrification zone and second-level anaerobic zone, and the first-level anaerobic zone includes ≥ 3 Reaction chamber, the micro-exposure short-range nitrification zone includes 1 to 2 reaction chambers, the secondary anaerobic zone includes ≥ 2 reaction chambers, and the bottom of the reaction chamber in the micro-exposure short-range nitrification zone is equipped with micropores An aeration pipe, a return pipe is provided between the upper part of the reaction chamber of the micro-exposure short-range nitrification zone and the lower part of the reaction chamber of the first-stage anaerobic zone, and the upstream area of each of the reaction chambers is provided with fillers, each The tops of the reaction chambers of the primary anaerobic zone and the secondary anaerobic zone are provided with biogas headers, and the tops of the reaction chambers of each micro-exposure short-path nitrification zone are provided with ventilation pipes. The water outlet of the two-point water inlet pipe is arranged below the baffle plate of the first reaction chamber of the secondary anaerobic zone.

On the basis of the above technical solutions, the present invention can also be improved as follows.

Further, the pool body is a cuboid.

Further, the folding angle of the baffle is 45°.

Further, when the influent COD is 2000-5000 mg/L and ammonia nitrogen is 50-200 mg/L, the primary anaerobic zone includes 3 reaction chambers, the micro-exposure short-range nitrification zone includes 1 reaction chamber, and the The secondary anaerobic zone consists of 2 reaction chambers.

Further, when the influent COD is 5000-10000 mg/L and ammonia nitrogen is 200-800 mg/L, the primary anaerobic zone includes 4 reaction chambers, and the micro-exposure short-path nitrification zone includes 2 reaction chambers, the The secondary anaerobic zone includes 2 reaction chambers.

Further, the distance between the bottom of the filler and the bottom of the baffle is ≥ 20 cm, and the distance between the top of the filler and the water surface is ≤ 30 cm.

Further, the filler is a suspended flexible polymer filler.

Further, the filler is for the attachment and growth of microorganisms.

Further, the inner diameter of the microporous aeration tube is 6-12 mm, and the distance between the microporous aeration tube and the bottom of the pool body is ≤10 cm, ≥5 cm.

Further, the microporous aeration pipe is connected with a blower.

Further, the concentration of dissolved oxygen in the reaction chamber of each micro-exposure short-range nitrification zone is 0.5-1.0 mg/L.

Further, when there is one reaction chamber in the micro-exposure short-range nitrification zone, the return pipe is provided with one, which is arranged on the upper part of the first reaction chamber of the micro-exposure short-range nitrification zone and the second one of the primary anaerobic zone. between the lower parts of the reaction chambers.

Further, when there are two reaction chambers in the micro-exposure short-range nitrification zone, two return pipes are provided, one of which is arranged on the upper part of the first reaction chamber in the micro-exposure short-range nitrification zone and the first-stage anaerobic Between the lower part of the second reaction chamber of the micro-exposure short-path nitrification zone and the lower part of the first reaction chamber of the primary anaerobic zone.

Further, the water inlet of the return pipe is arranged at the upper part of the reaction chamber of the micro-exposure short-path nitrification zone.

Further, the water outlet of the return pipe is set at the lower part of the reaction chamber of the primary anaerobic zone.

Further, a return pump is provided on the return pipe, and the return pump is used to provide power for the return water entering the return pipe.

Further, the return pipe is provided with a return valve, and the return valve is used to adjust the return ratio of return water flowing back from the micro-exposure short-path nitrification area to the first anaerobic area.

Further, the reflux ratio is 20-50%.

Further, the ventilation pipe is used to discharge the gas generated during blast aeration.

Further, a diverter valve is provided on the second water inlet pipe, and the diverter valve is used to adjust the ratio of the waste water diverted from the main water inlet pipe to the second water inlet pipe.

Further, the diversion ratio is ≤20% of the total water intake of the main water inlet pipe.

Further, when the influent COD<3000mg/L, the diverter valve is opened, which can increase the COD in the secondary anaerobic zone, increase the carbon source, and improve the effect of subsequent denitrification.

The beneficial effects of the present invention are:

1. In the present invention, one to two reaction chambers in the middle section of the traditional ABR reactor are used as micro-exposure short-range nitrification chambers, and part of the high-concentration NO ₂ ^- effluent flows into the secondary anaerobic zone for denitrification, and part of it flows back to the primary stage The anaerobic zone can stabilize the quality of influent water, achieve the purpose of efficient denitrification and denitrification, and COD removal.

2. The upstream area of each reaction chamber of the present invention is equipped with suspended flexible polymer fillers, which can reduce the dead area of the reaction chamber, effectively solve the problem of sludge loss, increase the sludge content, and increase the organic load of the ABR reactor.

3. In the present invention, when the influent COD is less than 3000mg/L, the diverter valve is opened to let a part of the wastewater directly enter the secondary anaerobic zone, which can increase the COD of the secondary anaerobic zone, increase the carbon source, and improve subsequent denitrification Effect.

4. The invention has simple structure and low investment cost, can effectively realize COD degradation and denitrification treatment of high-COD and high-ammonia-nitrogen wastewater, and is especially suitable for treating high-load and high-ammonia-nitrogen wastewater.

Description of drawings

Fig. 1 is the elevation view of the present invention.

Figure 2 is a plan view of the present invention.

In the accompanying drawings, the list of parts represented by each label is as follows:

1. Tank body, 2. Main water inlet pipe, 3. First water inlet pipe, 4. Water inlet tank, 5. Second water inlet pipe, 6. Partition plate, 7. Baffle plate, 8. Biogas collecting pipe, 9 , microporous aeration pipe, 10, ventilation pipe, 11, return pipe, 12, water inlet of return pipe, 13, water outlet of return pipe, 14, water outlet pipe, 15, water outlet tank, 16, water outlet of second water inlet pipe , 17, packing, 18, return pump, 19, return valve, 20, diverter valve.

detailed description

The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

As shown in Figure 1 and Figure 2, a short-range nitrification and denitrification integrated ABR reactor includes a tank body 1, a main water inlet pipe 2, a first water inlet pipe 3, a second water inlet pipe 5, a biogas collecting pipe 8, Microporous aeration pipe 9, ventilation pipe 10, return pipe 11 and water outlet pipe 14, the main water inlet pipe 2 is connected with the waste water inlet, and the first water inlet pipe 3 and the second water inlet pipe 5 are connected with the main water inlet pipe. The water pipes 2 are connected, and the interior of the pool body 1 is provided with a plurality of partitions 6 perpendicular to the bottom of the pool body 1, which divides the interior of the pool body 1 into a plurality of reaction chambers connected in series and independent of each other. There is a baffle plate 7 from top to bottom inside the chamber to divide it into a downstream area and an upstream area. The upper part of the first reaction chamber of the pool body 1 is provided with a water inlet tank 4, which is connected to the first water inlet pipe 3 , the upper part of the last reaction chamber is provided with a water outlet tank 15, and is connected with the water outlet pipe 14, it is characterized in that, the inside of the pool body 1 is an anaerobic zone, an anaerobic zone, The micro-exposure short-range nitrification zone and the secondary anaerobic zone, the primary anaerobic zone includes ≥ 3 reaction chambers, the micro-exposure short-range nitrification zone includes 1 to 2 reaction chambers, and the secondary anaerobic zone Including ≥ 2 reaction chambers, the bottom of the reaction chamber of the micro-exposure short-range nitrification zone is equipped with a microporous aeration pipe 9, the upper part of the reaction chamber of the micro-exposure short-range nitrification zone and the reaction chamber of the primary anaerobic zone A return pipe 11 is provided between the lower part of each of the reaction chambers, and fillers 17 are provided in the upstream region of each of the reaction chambers. Biogas collecting pipe 8, the top of the reaction chamber of each said micro-exposure short-range nitrification zone is provided with aeration pipe 10, and the water outlet 16 of said second sub-water inlet pipe 5 is located at the first of said secondary anaerobic zone. Below the baffle plate 7 of the first reaction chamber.

The pool body 1 is a cuboid.

The folding angle of the baffle 7 is 45°.

When the influent COD is 2000-5000 mg/L and ammonia nitrogen is 50-200 mg/L, the primary anaerobic zone includes 3 reaction chambers, the micro-exposure short-range nitrification zone includes 1 reaction chamber, and the secondary The anaerobic zone consists of 2 reaction chambers.

When the influent COD is 5000-10000 mg/L and ammonia nitrogen is 200-800 mg/L, the primary anaerobic zone includes 4 reaction chambers, the micro-exposure short-range nitrification zone includes 2 reaction chambers, and the secondary The anaerobic zone consists of 2 reaction chambers.

The distance between the bottom of the filler 17 and the bottom of the baffle 7 is ≥20 cm, and the distance between the top of the filler 17 and the water surface is ≤30 cm.

The filler 17 is a suspended flexible polymer filler.

The filler 17 is for the attachment and growth of microorganisms.

The inner diameter of the microporous aeration pipe 9 is 6-12 mm, and the distance between the microporous aeration pipe 9 and the bottom of the pool body 1 is ≤10 cm, ≥5 cm.

The microporous aeration pipe 9 is connected with a blower.

The concentration of dissolved oxygen in the reaction chamber of each micro-exposure short-range nitrification zone is 0.5-1.0 mg/L.

When there is one reaction chamber in the micro-exposure short-range nitrification zone, one return pipe 11 is arranged on the upper part of the first reaction chamber of the micro-exposure short-range nitrification zone and the second one of the first-stage anaerobic zone. Between the lower part of the reaction chamber, that is, the water inlet 12 of the return pipe 11 is set on the upper part of the first reaction chamber in the micro-exposure short-range nitrification zone, and the water outlet 13 of the return pipe 11 is set in the second reaction chamber of the primary anaerobic zone. lower part of the chamber.

When there are 2 reaction chambers in the micro-exposure short-range nitrification zone, two return pipes 11 are provided, one of which is arranged on the upper part of the first reaction chamber of the micro-exposure short-range nitrification zone and the primary anaerobic zone Between the lower part of the second reaction chamber, that is, the water inlet 12 of the return pipe 11 is arranged on the upper part of the first reaction chamber of the micro-exposure short-range nitrification zone, and the water outlet 13 of the return pipe 11 is arranged at the first stage of the anaerobic zone. The bottom of the second reaction chamber; the other is arranged between the bottom of the second reaction chamber of the micro-exposure short-path nitrification zone and the top of the first reaction chamber of the primary anaerobic zone, that is, another return pipe 11 The water inlet 12 is set on the upper part of the second reaction chamber of the micro-exposure short-range nitrification zone, and the water outlet 13 of the other return pipe 11 is set on the lower part of the first reaction chamber of the primary anaerobic zone.

A return pump 18 is provided on the return pipe 11 , and the return pump 18 is used to provide power for the return water entering the return pipe 11 .

The return pipe 11 is provided with a return valve 19, and the return valve 19 is used to adjust the return flow ratio of return water flowing back from the micro-exposure short-path nitrification area to the first anaerobic area.

The reflux ratio is 20-50%.

The ventilation pipe 10 is used to discharge the gas generated during blast aeration.

The second sub-inlet pipe 5 is provided with a diverter valve 20 , and the diverter valve 20 is used to adjust the proportion of waste water diverted from the main water inlet pipe 1 to the second sub-inlet pipe 5 .

The diversion ratio is ≤ 20% of the total water intake of the main water inlet pipe 1 .

When the influent COD<3000mg/L, the diverter valve 20 is opened, which can increase the COD in the secondary anaerobic zone, increase the carbon source, and improve the subsequent denitrification effect.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (9)

1. A short-range nitrification and denitrification integrated ABR reactor, comprising a tank body (1), a main water inlet pipe (2), a first sub-water inlet pipe (3), a second sub-water inlet pipe (5), a biogas collecting pipe ( 8), microporous aeration pipe (9), ventilation pipe (10), return pipe (11) and water outlet pipe (14), described main water inlet pipe (2) is connected with waste water inlet, and described first sub-inlet The water pipe (3) and the second sub-inlet pipe (5) are all connected to the main water inlet pipe (2), and the inside of the pool body (1) is provided with a plurality of partitions (6) perpendicular to the bottom of the pool body. The interior of the pool body (1) is divided into a plurality of reaction chambers connected in series and mutually independent, and each reaction chamber is divided into a downstream region and an upstream region by a baffle plate (7) from top to bottom inside each reaction chamber. The upper part of the first reaction chamber of the pool body (1) is provided with a water inlet tank (4), and is connected with the first water inlet pipe (3), and the upper part of the last reaction chamber is provided with a water outlet tank (15), and is connected with the outlet The water pipes (14) are connected, and it is characterized in that, from the first water inlet pipe (3) to the water outlet pipe (14) inside the pool body (1), there are first-level anaerobic zone, micro-exposure short-range nitrification zone and second-level anaerobic zone, the primary anaerobic zone includes ≥ 3 reaction chambers, the micro-exposure short-range nitrification zone includes 1 to 2 reaction chambers, and the secondary anaerobic zone includes ≥ 2 reaction chambers, The bottom of the reaction chamber of the micro-exposure short-range nitrification zone is provided with a microporous aeration pipe (9), and a microporous aeration pipe (9) is provided between the upper part of the reaction chamber of the micro-exposure short-range nitrification zone and the lower part of the reaction chamber of the first-stage anaerobic zone. Backflow pipe (11), the upstream zone of each said reaction chamber is all provided with packing (17), and the top of each described primary anaerobic zone and the top of the reaction chamber of described secondary anaerobic zone is all provided with biogas collector. Trachea (8), the top of the reaction chamber of each said micro-exposure short-range nitrification zone is all provided with ventilation pipe (10), and the water outlet (16) of described second water inlet pipe (5) is located at described secondary Below the baffle (7) of the first reaction chamber of the anaerobic zone. 2. A short-range nitrification and denitrification integrated ABR reactor according to claim 1, characterized in that, when the influent COD is 2000-5000 mg/L and ammonia nitrogen is 50-200 mg/L, the first-stage exhaust The oxygen zone includes 3 reaction chambers, the micro-exposure short-range nitrification zone includes 1 reaction chamber, and the secondary anaerobic zone includes 2 reaction chambers. 3. A short-range nitrification and denitrification integrated ABR reactor according to claim 1, characterized in that, when the influent COD is 5000-10000 mg/L and ammonia nitrogen is 200-800 mg/L, the first-stage exhaust The oxygen zone includes 4 reaction chambers, the micro-exposure short-range nitrification zone includes 2 reaction chambers, and the secondary anaerobic zone includes 2 reaction chambers. 4. A kind of short-range nitrification and denitrification integrated ABR reactor according to claim 1, characterized in that, the bottom of the filler (17) is ≥ 20cm from the bottom of the baffle (7), and the filler (17) ) from the top of the water surface ≤ 30cm. 5 . The short-path nitrification and denitrification integrated ABR reactor according to claim 4 , characterized in that, the filler ( 17 ) is a suspended flexible polymer filler. 6 . 6. a kind of short-range nitrification and denitrification integrated ABR reactor according to claim 1, is characterized in that, the internal diameter of described microporous aeration pipe (9) is 6～12mm, and described microporous aeration pipe ( 9) The distance from the bottom of the pool body (1) is ≤10cm, ≥5cm. 7 . The short-path nitrification and denitrification integrated ABR reactor according to claim 1 , wherein the concentration of dissolved oxygen in the reaction chamber of each micro-exposure short-path nitrification zone is 0.5-1.0 mg/L. 8. A short-cut nitrification and denitrification integrated ABR reactor according to any one of claims 1 to 7, characterized in that, when there is one reaction chamber in the micro-exposure short-cut nitrification zone, the return pipe (11) One is provided, which is arranged between the upper part of the first reaction chamber in the micro-exposure short-path nitrification zone and the lower part of the second reaction chamber in the primary anaerobic zone. 9. A short-range nitrification and denitrification integrated ABR reactor according to claim 1, characterized in that, when there are two reaction chambers in the micro-exposure short-range nitrification zone, the return pipe (11) is provided with Two, one of which is set between the upper part of the first reaction chamber in the micro-exposure short-path nitrification zone and the lower part of the second reaction chamber in the first-level anaerobic zone, and the other is set in the second reaction chamber of the micro-exposure short-path nitrification zone Between the upper part of the two reaction chambers and the lower part of the first reaction chamber of the primary anaerobic zone.