CN105502660A - Reverse-flow type biological contact device - Google Patents

Abstract

A reflux type biological contact device, comprising a biological contact tower, in which anoxic zone 1, anaerobic zone, anoxic zone 2 and aerobic zone are set from top to bottom, a gas collection chamber is set at the top of the biological contact tower, and a gas collection chamber is set at the bottom of the biological contact tower. The mud hopper is set, and the biological contact tower is provided with a water inlet on the upper part of the side wall between the gas collection chamber and the mud hopper, and a water outlet on the lower part, and the aeration plate is set between the mud hopper and the aerobic area. When the system is running, the air flows upwards The sewage enters from the water inlet, moves downward, and flows out from the lower water outlet. During the operation of the system, the easily precipitated suspended solids, sludge or shedding biofilm are discharged from the mud outlet. discharge, the present invention sets the anaerobic zone, anoxic zone, and aerobic zone in the same biological contact oxidation tower at the same time, while realizing the removal of suspended solids precipitation, it strengthens the removal effect of nutrients such as organic matter and nitrogen and phosphorus in water, and improves The quality of effluent water is improved, the water treatment process is shortened, and it has a good prospect for popularization and application.

Description

A reflux biological contact device

technical field

The invention belongs to the technical field of sewage treatment, relates to the synchronous removal of suspended solids, organic matter, nitrogen and phosphorus and other nutrient salts, and in particular to a backflow type biological contact device.

Background technique

With the massive discharge of industrial wastewater and urban domestic sewage, drinking water sources in many areas have been polluted to varying degrees, and water shortages are very serious, mainly manifested in the increase of ammonia nitrogen and phosphorus concentrations, the decrease of dissolved oxygen, and the aggravation of organic pollution. Raw water quality is declining. Therefore, in this case, how to rationally use the existing water resources, pre-treat the polluted raw water, and improve the safety of water supply is particularly important. Therefore, seeking new technological methods to effectively remove nitrogen, phosphorus and organic pollutants in water is one of the main problems faced by current water purification technology. In the pretreatment technology of slightly polluted raw water, the biological pretreatment process is considered to be one of the most effective technologies. It relies on the metabolic activities of microbial groups to treat ammonia nitrogen, phosphorus, organic pollutants, nitrite and iron in water. Preliminary removal of inorganic pollutants such as manganese, which not only improves the coagulation and sedimentation performance of water, makes subsequent conventional treatment work better, but also reduces the load of conventional treatment and subsequent advanced treatment process units, prolongs filtration or activated carbon adsorption, etc. The service cycle and capacity of the physical and chemical treatment process can maximize the overall effect of the water treatment process, reduce water treatment costs, and better control water pollution.

Contents of the invention

The purpose of the present invention is to provide a reflux type biological contact device. The anaerobic zone, anoxic zone and aerobic zone are simultaneously set in the same biological contact oxidation tower, which can realize the synchronization of suspended solids, organic matter and nutrients such as nitrogen and phosphorus. Removal can shorten the water treatment process and has a good application prospect; at the same time, this device has a small footprint, low construction cost, and simple structure, and can realize synchronous and enhanced removal of organic matter and nitrogen and phosphorus in water while completing the sedimentation function, and has Good resistance to shock loads.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A reflux type biological contact device, comprising a biological contact tower 1, an anoxic zone 1, an anaerobic zone, anoxic zone 2 and an aerobic zone are set from top to bottom in the biological contact tower 1, and the top of the biological contact tower 1 is set The gas collecting chamber 2 with the air outlet pipe 6 is provided with a mud bucket 3 with a mud outlet 17 at the bottom, and the biological contact tower 1 is provided with a water inlet on the upper part of the side wall between the gas collecting chamber 2 and the mud bucket 3, and the lower part is provided with The water outlet 10 and the aeration disc 12 are set between the mud hopper 3 and the aerobic area. When the system is running, the air moves upwards and passes through the aerobic area and the anoxic area in turn. The gas generated during the operation of the system enters the set. The air cavity 2 is finally discharged from the air outlet pipe 6, while the sewage enters from the water inlet, and under the action of gravity, passes through the anoxic zone 1, anaerobic zone, anoxic zone 2 and aerobic zone in sequence, and flows out from the lower water outlet 10, Suspended solids, sludge or exfoliated biofilms in the process are discharged from the mud outlet 17 .

Corresponding to the anaerobic zone, the anoxic zone and the aerobic zone, the elastic filler 4 that is conducive to the attachment and enrichment of microorganisms is set in the biological contact tower 1, the elastic filler 4 in the aerobic zone enriches the aerobic microorganisms, and the elastic filler 4 in the anoxic zone The elastic filler 4 enriches facultative anaerobic microorganisms, and the elastic filler 4 in the anaerobic zone enriches obligate anaerobic microorganisms.

The length of the biological contact tower 1 is sufficient to make the anaerobic zone, the anoxic zone and the aerobic zone distinct, and meet the normal environmental requirements of microorganisms in each section.

The biological contact tower 1 is also provided with a water distribution system 8, the water distribution system 8 is a circular pipeline structure with a built-in cross connection channel, and its pipeline cross-section is semicircular, that is, the length of the semicylindrical The tube is bent. The horizontal water inlet pipe 7 communicates with the water distribution system 8 from the water inlet, and the sewage enters the water distribution system 8 and falls into the anoxic zone 1 in the biological contact tower 1 by way of overflow.

In the biological contact tower 1, the side wall at the upper part of the anoxic zone is provided with an air intake horizontal pipe 16, which is connected to the aeration pan 12 through the air intake vertical pipe 5, and the air passes through the air intake horizontal pipe in turn. 16. The air intake vertical pipe 5 enters the aeration pan 12 for aeration.

The water outlet 10 is connected to a nozzle of the three-way outlet pipe 11 outside the biological contact tower 1, wherein the second nozzle of the three-way outlet pipe 11 is connected to one end of the digestive juice return pipe 9, and the end of the digestive juice return pipe 9 The other end is connected to the water distribution system in the biological contact tower 1, and a part of the effluent is used as the reflux digestive liquid.

The present invention also includes an online dynamic control aeration device, the online dynamic control aeration device includes a low DO concentration detection probe 13 arranged between the anaerobic zone and the anoxic zone two, and between the anoxic zone two and the aerobic zone The medium DO concentration detection probes 14 are all attached to the inner wall of the biological contact tower 1;

The detection range of the low DO concentration detection probe 13 is DO<0.2mg/L,

Medium DO concentration detection probe 14 detection range 0.2mg/L<DO<0.5mg/L,

The low DO concentration detection probe 13 adjusts the opening of the pneumatic valve through signal feedback to the aeration controller to ensure that the dissolved oxygen concentration at the bottom of the anaerobic zone is around 0.2 mg/L; the medium DO concentration detection probe 14 adjusts the opening of the pneumatic valve through signal feedback, Make sure that the dissolved oxygen concentration at the bottom of the anoxic zone is around 0.5mg/L.

Compared with the prior art, the present invention has reasonable design and simple operation; by setting anaerobic zone, anoxic zone and aerobic zone in the same biological contact oxidation tower at the same time, it has the advantages of small occupied area, low construction cost and simple structure In the present invention, the biological contact tower is long enough, the anaerobic zone, the anoxic zone, and the aerobic zone are clearly segmented, and a large number of obligate microorganisms are enriched on the elastic fillers in different segments, and the biofilm exceeds the elasticity due to excessive enrichment. The filler supports and falls off naturally, and under the impact of water flow, the biofilm activity is high, and the whole system always has good impact load resistance; the online dynamic control aeration device of the present invention can automatically adjust the operation of the device according to the monitoring value of the DO concentration detection probe The amount of aeration saves energy consumption; in the present invention, a mud hopper is set at the bottom of the biological contact tower, so that the suspended matter in the influent, the sludge and the shedding biofilm produced by the anaerobic zone, the anoxic zone, and the aerobic zone are concentrated in the mud hopper In the process, there is no need to set up a separate sedimentation tank for the effluent, which reduces the floor space and saves investment. Therefore, the present invention enhances the removal efficiency of organic matters in water while realizing the function of removing suspended solids, and effectively improves the effluent quality of the process.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a top view of the water distribution system of the present invention.

Fig. 3 is a perspective view of the pipelines constituting the water distribution system of the present invention.

Fig. 4 is a schematic diagram of the aeration system of the present invention.

detailed description

The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

As shown in FIG. 1 , a reflux biological contact device includes a biological contact tower 1 in which anoxic zone 1, anaerobic zone, anoxic zone 2 and aerobic zone are set from top to bottom.

The top of the biological contact tower 1 is provided with a gas collection chamber 2 with an outlet pipe 6 to collect gases such as methane and _N2 generated during the operation of the system. A mud hopper 3 with a mud outlet 17 is provided at the bottom, so that the suspended matter in the influent and the sludge or exfoliated biofilm produced by the anaerobic zone, the anoxic zone and the aerobic zone are concentrated in the mud hopper 3, and the water outlet does not need Sedimentation tanks are set up separately.

The biological contact tower 1 is provided with a water inlet on the upper part of the side wall between the gas collection chamber 2 and the mud hopper 3, and a water outlet 10 is provided at the lower part, and the aeration disc 12 is arranged between the mud hopper 3 and the aerobic area. When the system is running, The air moves upwards and passes through the aerobic zone and the anoxic zone 2 in turn. The gas generated during the operation of the system enters the gas collection chamber 2 and is finally discharged from the air outlet pipe 6. At the same time, the sewage enters from the water inlet and passes through the anoxic zone under the action of gravity. Zone 1, anaerobic zone, anoxic zone 2 and aerobic zone flow out from the water outlet 10 at the bottom, and the material in the mud bucket 3 is discharged from the mud outlet 17.

Corresponding to the anaerobic zone, the anoxic zone and the aerobic zone, the biological contact tower 1 is provided with elastic packing 4 which is beneficial to the attachment and enrichment of microorganisms, which is beneficial to the attachment and enrichment of microorganisms in each section. The elastic filler 4 in the aerobic zone is enriched with aerobic microorganisms, the elastic filler 4 in the anoxic zone is enriched with facultative anaerobic microorganisms, and the elastic filler 4 in the anaerobic zone is enriched with obligate anaerobic microorganisms.

The length of the biological contact tower 1 is sufficient to make the anaerobic zone, the anoxic zone and the aerobic zone distinct, and to meet the normal environmental requirements of microorganisms in each section.

The biological contact tower 1 is also provided with a water distribution system 8, as shown in Figure 2, the water distribution system 8 is a circular pipeline structure with a built-in cross connection channel, and its pipeline cross-section is semicircular, that is, it consists of a semi-cylindrical A long tube is bent, as shown in Figure 3. The horizontal water inlet pipe 7 communicates with the water distribution system 8 from the water inlet, and the sewage enters the water distribution system 8 and falls into the anoxic zone 1 in the biological contact tower 1 by way of overflow.

In the biological contact tower 1, an inlet horizontal pipe 16 is arranged on the side wall of the upper part of the anoxic zone. The air intake horizontal pipe 16 and the air intake vertical pipe 5 enter the aeration pan 12 for aeration.

The water outlet 10 is connected to a nozzle of the three-way outlet pipe 11 outside the biological contact tower 1, wherein the second nozzle of the three-way outlet pipe 11 is connected to one end of the digestive juice return pipe 9, and the other end of the digestive juice return pipe 9 Connected to the biological contact tower 1 cloth water system to realize a part of the effluent as reflux digestive fluid.

The present invention also includes an online dynamic regulation and control aeration device. The online dynamic regulation and control aeration device includes a low DO concentration detection probe 13 arranged between the anaerobic zone and the anoxic zone two, and an intermediate sensor between the anoxic zone two and the aerobic zone. The DO concentration detection probes 14 are all attached to the inner wall of the biological contact tower 1; The detection range of the low DO concentration detection probe 13 is DO<0.2mg/L, the detection range of the medium DO concentration detection probe 14 is 0.2mg/L<DO<0.5mg/L, and the detection range of the low DO concentration detection probe 13 is adjusted by the signal feedback aeration controller The opening of the pneumatic valve ensures that the dissolved oxygen concentration at the bottom of the anaerobic zone is around 0.2 mg/L; the medium DO concentration detection probe 14 adjusts the opening of the pneumatic valve through signal feedback to ensure that the dissolved oxygen concentration at the bottom of the anoxic zone is at 0.5 mg/L about.

Principle of the present invention is:

The sewage enters the water distribution system 8 through the water inlet pipe 7, and falls into the anoxic zone 1 of the biological contact tower 1 through the overflow method. A large amount of organic carbon in the sewage is decomposed and utilized by facultative anaerobic microorganisms, and releases intracellular phosphorus, denitrifying bacteria Using nitrate nitrogen produced in the aerobic zone as the final electron acceptor, various organic substrates in sewage, such as organic acids, alcohols, carbohydrates or alkanes, benzoates, phenols and other benzene derivatives It is used as an electron donor (carbon source) for denitrification and denitrification; suspended solids in water are either intercepted by biofilm on the elastic filler 4 or degraded by microorganisms or deposited into the mud hopper 3 . Under the action of gravity, the sewage enters the anaerobic zone, the organic carbon is further decomposed under the action of anaerobic bacteria, and the phosphorus release effect is further improved. The methane and other gases produced in the anaerobic stage are collected in the gas collection chamber 2 and discharged from the air outlet pipe 6; the sewage Continue to enter the anoxic zone 2 downwards, the organic carbon is further decomposed under the action of facultative anaerobic bacteria, and the phosphorus release effect is further improved; finally, the sewage enters the aerobic zone, and the ammonia nitrogen in the water is converted into nitrate nitrogen under the action of nitrifying bacteria, and the phosphorus accumulating bacteria Phosphorus is fully absorbed, and organic carbon is removed to the greatest extent under the action of aerobic bacteria, so as to achieve the purpose of synchronously removing organic matter and nutrients such as nitrogen and phosphorus. After treatment, the water finally flows out from the water outlet 10, and a part of the effluent is used as digestive juice to flow back through the reflux pump To the water distribution system to complete the maximum denitrification of the system.

Claims (8)

1. a return-flow type biological device, comprise biological tower (1), it is characterized in that, in described biological tower (1), oxygen-starved area one is set from top to bottom, anaerobic zone, oxygen-starved area two and aerobic zone, biological tower (1) top is provided with the air collecting chamber (2) of escape pipe (6), bottom is provided with the bucket (3) of mud mouth (17), the top of the sidewall of biological tower (1) between air collecting chamber (2) and bucket (3) arranges water-in, bottom sets out the mouth of a river (10), aeration plate (12) is arranged between described bucket (3) and aerobic zone, during system cloud gray model, upward motion of air, successively through aerobic zone, oxygen-starved area two, the gas produced in system operation enters air collecting chamber (2) and finally discharges from escape pipe (6), sewage enters from water-in simultaneously, under gravity successively through oxygen-starved area one, anaerobic zone, oxygen-starved area two and aerobic zone, flow out from the water outlet (10) of bottom, easy precipitation suspended substance in this process, mud or the microbial film that comes off are discharged from mud mouth (17).

2. return-flow type biological device according to claim 1, it is characterized in that, be provided with the elastic filler (4) being beneficial to microorganic adhesion and enrichment corresponding to anaerobic zone, oxygen-starved area and aerobic zone in described biological tower (1), elastic filler (4) the enrichment aerobic microbiological of aerobic zone, elastic filler (4) the enrichment amphimicrobe of oxygen-starved area, elastic filler (4) the enrichment obligate anaerobe of anaerobic zone.

3. return-flow type biological device according to claim 1, is characterized in that, the length of described biological tower (1) is enough to make anaerobic zone, oxygen-starved area and aerobic zone segmentation obvious, meets each section of normal environmental requirement of microorganism.

4. return-flow type biological device according to claim 1, it is characterized in that, water distribution system (8) is also provided with in described biological tower (1), described water distribution system (8) is the annular pipeline structure of built-in cross connecting passage, and its pipe section is semicircle, the water inlet pipe (7) of level is communicated with from water-in with water distribution system (8), sewage enters water distribution system (8), falls oxygen-starved area one in biological tower (1) by overflow manner.

5. return-flow type biological device according to claim 1, it is characterized in that, the sidewall being positioned at top, oxygen-starved area one in described biological tower (1) is provided with air inlet transverse tube (16), air inlet transverse tube (16) is connected with aeration plate (12) by air inlet vertical tube (5), air enters aeration plate (12) through air inlet transverse tube (16), air inlet vertical tube (5) successively, carries out aeration.

6. return-flow type biological device according to claim 1, it is characterized in that, described water outlet (10) connects a mouth of pipe of biological tower (1) threeway rising pipe (11) outward, wherein, second mouth of pipe of threeway rising pipe (11) connects one end of Digestive system return line (9), the other end of Digestive system return line (9) is connected in the water distribution system of biological tower (1), realizes a part of water outlet as return digestion liquid.

7. return-flow type biological device according to claim 1, it is characterized in that, online dynamic regulation aerating apparatus, described online dynamic regulation aerating apparatus comprises that the low DO Concentration Testing be laid between anaerobic zone and oxygen-starved area two is popped one's head in (13), middle DO Concentration Testing between oxygen-starved area two and aerobic zone is popped one's head in (14), each probe be all close to be arranged on biological tower (1) inwall on; Each probe connection control device, controller is connected with the setter of aeration plate (12).

8. return-flow type biological device according to claim 7, is characterized in that, described low DO Concentration Testing probe (13) sensing range DO<0.2mg/L,

Middle DO Concentration Testing probe (14) sensing range 0.2mg/L<DO<0.5mg/L,

Low DO Concentration Testing probe (13) regulates operated pneumatic valve aperture by signal feedback aeration controller, guarantees that dissolved oxygen concentration bottom anaerobic zone is at about 0.2mg/L; Middle DO Concentration Testing probe (14) regulates operated pneumatic valve aperture by signal feedback, guarantees that dissolved oxygen concentration bottom oxygen-starved area is at about 0.5mg/L.