CN114044573A - Dynamic circulation anaerobic ammonium oxidation biological denitrification system - Google Patents
Dynamic circulation anaerobic ammonium oxidation biological denitrification system Download PDFInfo
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
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Abstract
The invention discloses a dynamic circulation anaerobic ammonium oxidation biological denitrification system, which comprises a denitrification reaction system and a separation system, wherein the denitrification reaction system comprises a reactor, a circulation guide cylinder, an aerator, a water inlet pipe and a reaction water outlet pipe, the separation system comprises a separator, a nested guide cylinder, a carding machine, a water outlet weir, a separation water inlet pipe and a sludge discharge pipe, the reaction water outlet pipe of the reactor is communicated with the separation water inlet pipe of the separator, under the condition that the water level of the reactor is higher than the water level of the separator, mixed liquid treated by the reactor is circulated inside and outside the circulation guide cylinder to complete anaerobic ammonium oxidation denitrification, the treated mixed liquid enters the nested guide cylinder of the separator under the liquid level difference to perform top circulation degassing, then is subjected to solid-liquid separation by nesting outside the guide cylinder, and the precipitated sludge returns to the bottom of the reactor through the sludge discharge pipe at the bottom of the separator to perform anaerobic ammonium oxidation denitrification again, thereby realizing the dynamic circulation of the denitrification of the anaerobic ammonium oxidation organism.
Description
Technical Field
The invention relates to the field of sewage treatment equipment, in particular to a dynamic circulation anaerobic ammonium oxidation biological denitrification system.
Background
The nitrogen in the wastewater generally consists of: organic nitrogen, ammonia nitrogen, nitrite nitrogen, nitrate nitrogen and the like. If the nitrogen content in the wastewater is too high, the eutrophication phenomenon of the water body can be strongly induced after the wastewater is discharged into a natural water body, so that a great amount of blue algae are bred and propagated, and the water quality is seriously deteriorated. Therefore, the removal of nitrogen from wastewater is an important part of wastewater treatment.
Currently, in the wastewater treatment process, especially for wastewater with high COD and high ammonia nitrogen characteristics such as landfill leachate, kitchen biogas slurry, etc., the most economical and widely applicable is a biological denitrification process, wherein the most typical conventional biological denitrification process for wastewater is an anoxic-aerobic (a/O) process system, and the biochemical reaction principle thereof is as follows:
nitration: 2NH3+4O2 → NO 3- +2H + +2H2O
Denitrification: NO3 ++ COD +2H + → N2 ↓
Synthesis: 2NH3+4O2+ COD → N2 ↓ →
However, in the conventional nitrification/denitrification process, a large amount of oxygen is consumed, an additional carbon source is added, and a large amount of excess sludge is generated, so that the comprehensive cost of sewage treatment is greatly increased.
Disclosure of Invention
The invention aims to provide a dynamic circulation anaerobic ammonium oxidation biological denitrification system, which solves the problems in the prior art, realizes dynamic circulation denitrification while carrying out anaerobic ammonium oxidation treatment on wastewater, improves the sewage treatment efficiency and reduces the sewage treatment cost.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a dynamic circulation anaerobic ammonium oxidation biological denitrification system, which comprises a denitrification reaction system and a separation system;
the denitrification reaction system comprises a reactor, a circulating guide cylinder, an aerator, a water inlet pipe and a reaction water outlet pipe; the circulating guide cylinder is arranged in the middle of the reactor, and a water circulating space is arranged between the bottom of the circulating guide cylinder and the bottom of the reactor;
the aerator is arranged at the bottom of the reactor and comprises a central aerator, and the central aerator is arranged below the circulating guide cylinder;
the water inlet pipe is arranged on the side wall of the reactor and communicated with the interior of the reactor;
the reaction water outlet pipe is arranged at the upper part of the side wall of the reactor and is communicated with the inside of the reactor;
and the separation system is used for separating gas, liquid and solid phases of the mixed liquid of the wastewater discharged from the reaction water outlet pipe.
Preferably, the separation system comprises a separator, a nested guide shell, a carding machine, a water outlet weir, a separation water inlet pipe and a sludge discharge pipe;
the nested guide flow cylinder is arranged in the middle of the separator and comprises an outer cylinder and an inner cylinder, the inner cylinder is embedded in the outer cylinder, the bottom of the inner cylinder protrudes out of the outer cylinder, the bottom of the inner cylinder is abutted against the bottom of the separator, and the side wall of the bottom of the outer cylinder is also provided with a circulating outlet;
the carding machine is horizontally arranged at the upper part of the nested guide shell, and part of the carding machine is arranged in the nested guide shell;
the water outlet weir is arranged on the inner wall of the upper part of the separator and is used for discharging clear liquid of mud-water separation;
the separation water inlet pipe penetrates through the separator and is communicated with the bottom of the inner cylinder, and an inlet of the separation water inlet pipe is communicated with an outlet of the reaction water outlet pipe through a pipeline;
the sludge discharge pipe is arranged at the bottom of the separator and is used for discharging sludge separated and precipitated to the bottom;
preferably, return sludge pipes are arranged on two sides of the bottom of the reactor and are communicated with a sludge discharge pipe through a sludge return pump;
preferably, the aerator further comprises a peripheral aerator, and the peripheral aerator is arranged at the bottom of the reactor and positioned at two sides of the circulating guide cylinder;
a lifting device is also arranged in the circulating guide cylinder, and the lifting device drives a paddle folding type stirrer through a motor to lift liquid in the circulating guide cylinder;
preferably, a dissolved oxygen sensor, a pH sensor and a temperature sensor are arranged in the circulating guide cylinder;
a dissolved oxygen sensor, an oxidation-reduction potential sensor, a pH sensor and a temperature sensor are arranged between the circulating guide cylinder and the reactor;
preferably, a heat exchanger is arranged outside the reactor and is communicated with the inside of the reactor through a circulating pump;
a chemical feeding pipe is also arranged on the water inlet pipe of the reactor and is communicated with a chemical feeding device through a circulating pump, and alkaline liquid is placed in the chemical feeding device;
preferably, the carding machine comprises a power device, a bracket, carding grids and a bevel scraper;
the power device comprises a driving motor and a speed reducer, and an output main shaft of the speed reducer is connected with a support;
the bracket is two cross brackets which are vertically arranged;
the carding grid bars are vertically arranged on the support downwards in an array mode, the carding grid bars are provided with two groups, one group of carding grid bars are arranged in the nested guide cylinder, and the other group of carding grid bars are arranged between the separator and the nested guide cylinder;
the bevel scraper is arranged on the carding grid bars in the nested guide shell, the bevel scraper and the carding grid bars are crossed and distributed in an acute angle, and the bevel scraper is arranged between a water level line and a scum layer in the reactor;
preferably, the water outlet weir comprises a water outlet weir groove, a slag baffle, a shielding plate and a triangular guide plate;
the water outlet weir groove is arranged on the inner side of the separator shell, the water outlet weir groove is an annular water outlet weir groove, the top of the water outlet weir groove is level with the water level line, and the lower part of the water outlet weir groove is a chute folded towards the separator shell;
the slag trap is arranged on the inner side of the water outlet weir groove and is higher than the water outlet line, and the slag trap is arranged in parallel with the upper part of the water outlet weir groove;
the shielding plate is connected with the lower part of the slag trap, the other end of the shielding plate is parallel to the chute at the lower part of the water outlet weir groove, and a separation liquid flow passage is arranged among the shielding plate, the slag trap and the water outlet weir groove;
the triangular guide plate is arranged on the separator shell and is connected with the water outlet weir groove at the upper part, the triangular guide plate protrudes along the inner side of the separator shell, and the height of the triangular guide plate protruding out of the separator shell is the same as the width of the water outlet weir groove;
preferably, the inner diameter of the circulating guide cylinder is smaller than the radius of the reactor, and the top of the circulating guide cylinder is higher than the water level line of the reactor;
preferably, the inner diameter of the nested guide shell is smaller than the radius of the separator, the inner diameter of the inner shell is one third of the inner diameter of the outer shell, and the length of the outer shell is larger than half of the length of the inner shell.
Compared with the prior art, the invention has the following technical effects:
the dynamic circulation anaerobic ammonium oxidation biological denitrification system has the characteristics of high COD (chemical oxygen demand) and high ammonia nitrogen content of garbage percolate, kitchen biogas slurry and the like, and a stable biochemical reaction environment is established in the reactor by adopting large circulation flow; the dissolved oxygen level in the reactor is controlled by adopting limited aeration and zone aeration; controlling the temperature of the mixed liquid in the reactor by using a heat exchanger for circulating heating/cooling; the sludge backflow adopts measures such as a multipoint backflow mode without dead angles and the like, and creates suitable conditions for anaerobic ammonia oxidation reaction.
The separation system of the dynamic circulation anaerobic ammonium oxidation biological denitrification system adopts a secondary degassing area, so that floating sludge carrying micro bubbles is fully degassed, precipitated and reflowed to a reactor, and a surface carding device carding machine is adopted to carry out uninterrupted carding and disturbance on the floating sludge carrying micro bubbles, so that the separation of the sludge and the internal micro bubbles is promoted; the effluent weir of the separator is provided with a shielding and flow guiding component, so that floating sludge can not enter the effluent weir but is concentrated to a carding machine in a secondary degassing area for degassing, and the sludge can be completely left in the separator for precipitation and flows back to the reactor, thereby realizing dynamic cyclic denitrification, improving the sewage treatment efficiency and reducing the sewage treatment cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of the overall configuration of a dynamic circulation anammox biological denitrification system of the present invention;
FIG. 2 is a schematic diagram of a denitrification system of the dynamic circulation anammox biological denitrification system of the present invention;
FIG. 3 is a schematic diagram of a separation system of a dynamic circulation anammox biological denitrification system of the present invention;
FIG. 4 is a schematic diagram of the configuration of the separator of the dynamic circulation anammox biological denitrification system of the present invention;
FIG. 5 is a schematic view of the structure of a carding machine of the dynamic circulation anammox biological denitrification system of the present invention;
FIG. 6 is a schematic structural diagram of an effluent weir of the dynamic circulation anammox biological denitrification system of the present invention;
FIG. 7 is a schematic top view of a carding machine of the dynamic circulation anammox biological denitrification system of the present invention;
FIG. 8 is a partial schematic view of the dog-ear flight of the dynamic circulation anammox biological denitrification system of the present invention;
wherein, 1-reactor, 2-circulation guide flow cylinder, 3-lifting device, 4-center aerator, 5-periphery aerator, 6-return sludge pipe, 7-heat exchanger, 8-separator, 81-separator shell, 9-nested guide flow cylinder, 91-outer cylinder, 92-inner cylinder, 93-circulation outlet, 10-carding machine, 101-carding grid, 102-support, 103-power device, 104-angle scraper, 11-water outlet weir, 111-water outlet weir groove, 112-triangular guide plate, 113-slag baffle plate, 114-shield plate, 12-sludge discharge pipe, 13-return sludge pump, 14-chemical feeding device, 15-water inlet pipe, 16-chemical feeding pipe, 17-reaction water outlet pipe, 18-separate inlet pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a dynamic circulation anaerobic ammonium oxidation biological denitrification system, which solves the problems in the prior art, realizes dynamic circulation denitrification while carrying out anaerobic ammonium oxidation treatment on wastewater, improves the treatment efficiency of sewage, and reduces the sewage treatment cost.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, a dynamic circulation anammox biological denitrification system of the present invention is described in detail with reference to fig. 1 to 8 and the following detailed description.
Example one
As shown in fig. 1 to 4, the embodiment provides a dynamic circulation anaerobic ammonium oxidation biological denitrification system, which comprises a denitrification reaction system and a separation system, wherein the denitrification reaction system of the embodiment is mainly used for treating high COD and high ammonia nitrogen wastewater such as landfill leachate, kitchen biogas slurry and the like, and a stable biochemical reaction environment is established by adopting a large circulation flow; the piece-rate system of this embodiment mainly used carries out the separation of gas-liquid-solid three-phase to the waste water mixed liquid after denitrogenation reaction system handles, and can also evenly flow back denitrogenation reaction system with the mud of sediment, on the one hand supplyes reaction mud, on the other hand erodes the dead angle of denitrogenation reaction system bottom, avoids the siltation of mud here, hardens for realize dynamic cycle denitrogenation when waste water anaerobic ammonia oxidation handles, improve the treatment effeciency of sewage, reduce the supplement of oxygen and carbon source.
Specifically, as shown in fig. 2, the denitrification reaction system of the present embodiment includes a reactor 1, a circulation draft tube 2, an aerator, a water inlet pipe 15 and a reaction water outlet pipe 17, the circulation draft tube 2 is disposed in the middle of the reactor 1, the inner diameter of the circulation draft tube 2 is about one third of the inner diameter of the reactor 1, the top of the circulation draft tube 2 is higher than the water level line of the reactor 1, and a water circulation space is disposed between the bottom of the circulation draft tube 2 and the bottom of the reactor 1, so that the inside and outside of the circulation draft tube 2 are trisected, which is beneficial to the circulation treatment of wastewater in the reactor 1; the bottom of the reactor 1 is provided with an aerator, the aerator comprises a central aerator 4 and peripheral aerators 5, the central aerator 4 is arranged under the circulating guide cylinder 2, the peripheral aerators 5 are positioned at two sides of the circulating guide cylinder 2, the central aerator 4 is mainly used for aerating and supplementing oxygen to the wastewater in the circulating guide cylinder 2, the peripheral aerators 5 are used for supplementing aeration to prevent the oxygen content of the wastewater in the circulating guide cylinder 2 from being too low, generally, the peripheral aerators 5 are closed, and when the dissolved oxygen in the main aeration area in the circulating guide cylinder 2 is insufficient, the peripheral aerators 5 outside the circulating guide cylinder 2 can be properly opened to supplement the dissolved oxygen.
Because ANAMMOX (ANAMMOX) refers to the process of directly oxidizing NH4 to N2 under anaerobic or anoxic conditions with NO2 "as the electron acceptor, the nitrogen atoms in the reaction product N2 are derived from NO2+ and the other from NH4 +.
The equation for the reaction principle is:
partial nitration: 2NH3+3O2 → NO2- +2H + +2H2O
Anaerobic ammonia oxidation: NO2 ++ NH3+ H + → N2 ≠ +2H2O
Synthesis: 2NH3+1.5O2 → N2 ≠ +3H2O
The wastewater firstly enters a circulating guide cylinder 2 after entering a reactor 1, a lifting device 3 is arranged in the circulating guide cylinder 2, the lifting device 3 drives a paddle-folding stirrer through a motor to lift liquid in the circulating guide cylinder 2 to ascend, so that the wastewater is mixed with sludge and then enters the circulating guide cylinder 2 to carry out partial nitration reaction in the initial reaction stage under the matching of the lifting device 3 and a central aerator 4, after the partial nitration reaction is finished, the wastewater enters a space outside the circulating guide cylinder 2, because the peripheral aerator 5 is generally in a normally closed state, a space area outside the circulating guide cylinder 2 is basically in an anoxic or anaerobic state, and at the moment, ammonia nitrogen which is not nitrosated in the wastewater is combined with nitrite nitrogen after partial nitration by anaerobic ammonia oxidizing bacteria to produce nitrogen, thereby completing the anaerobic ammonia oxidation process.
The main factors influencing the effectiveness of the anaerobic ammonia oxidation system are as follows:
anammox (anamob, Anammox) is an autotrophic anaerobe belonging to the phylum pumila, belonging to chemoautotrophic organisms, generally using nitrite as an electron acceptor and ammonium oxide ions as nitrogen. The diversity of the biological population is a key factor for restricting the feasibility of the anaerobic ammonia oxidation technology, namely, the cooperative competition relationship among anaerobic ammonia oxidation bacteria (ANAOB), Ammonia Oxidation Bacteria (AOB), Nitrite Oxidation Bacteria (NOB) and denitrifying bacteria (DNB) is a key factor for realizing the anaerobic ammonia oxidation application.
During the anaerobic ammonia oxidation process, NH4+ needs to be converted into NO 2-state by aeration, and enough electron acceptors are provided for AnAOB.
The main environmental factors are carbon-nitrogen ratio (C/N), sludge age, temperature and Dissolved Oxygen (DO), wherein DO is an important influence factor of a nitrosation stage, wherein the half saturation coefficient of AOB to oxygen is higher than that of NOB, the NOB has weaker capability to compete for oxygen under the condition of lower DO, the control of DO concentration and the regulation of an aeration mode are one of control means for realizing short-range nitrification, and an intermittent aeration and DO limiting strategy is one of control strategies for easily realizing sewage main flow Anammox. Therefore, the central aerator 4 at the bottom of the circulating guide cylinder 2 carries out local aeration to increase DO, the DO in the area between the reactor 1 and the circulating guide cylinder 2 is limited, and the anaerobic ammonia oxidation process is regulated and controlled through the control of the DO.
The anaerobic ammonia oxidation environmental factors such as carbon-nitrogen ratio (C/N), sludge age and temperature are as follows:
carbon to nitrogen ratio (C/N):
too high COD inhibits the growth of AnAOB, and the C/N ratio in the anaerobic ammonia oxidation system is not larger than 4 at present. Otherwise the AnAOB activity is reduced and DNB is more competitive. The growth speed of NOB is higher than that of AOB under the low ammonia nitrogen load, and the anaerobic ammonia oxidation is more suitable for treating high ammonia nitrogen wastewater.
Sludge age:
in the nitrosation process, when the temperature is controlled to be 20-35 ℃, the growth rate of AOB is higher than that of NOB, and the system SRT is controlled to be larger than the generation time of the AOB and smaller than the generation time of the NOB, so that the NOB is discharged out of the system and the AOB keeps higher concentration, and the stable accumulation of NO2 & lt- & gt is realized. The adoption of the short SRT is one of the ideas for realizing the main stream Anamox technology of the sewage.
Temperature:
the higher temperature can not only improve the activity of the AOB and promote the growth rate of the AOB, but also further enlarge the difference between the activity and the growth rate of the AOB and the NOB. The increase in temperature inhibits NOB growth, which enhances AOB activity and effects NO 2-accumulation.
Because anaerobic ammonia oxidation is influenced by carbon-nitrogen ratio, temperature and dissolved oxygen, a plurality of sensors are arranged in the reactor 1, wherein a dissolved oxygen sensor, a pH sensor and a temperature sensor are arranged in the circulating guide cylinder 2, a dissolved oxygen sensor, an oxidation-reduction potential sensor, a pH sensor and a temperature sensor are arranged between the circulating guide cylinder 2 and the reactor 1, and the liquid of the reactor 1 and the circulating guide cylinder 2 is monitored through the sensors to ensure the reaction condition of the anaerobic ammonia oxidation system.
In order to ensure the reaction conditions of the anaerobic ammonia oxidation system, a heat exchanger 7 is further arranged outside the reactor 1, the heat exchanger 7 is communicated with the inside of the reactor 1 through a circulating pump, the heat exchanger 7 adjusts the temperature of the mixed liquid in the reactor 1 through a refrigerant or a heating medium, cooling water is adopted to circularly cool the mixed liquid in summer, hot water or hot steam is used to circularly heat the mixed liquid in winter, the temperature of the mixed liquid is controlled to be about 30 ℃, and a proper temperature environment is provided for anaerobic ammonia oxidation; in addition, still set up on the inlet tube 15 of reactor 1 with pencil 16, inlet tube 15 sets up the lateral wall at reactor 1, inlet tube 15 and the inside intercommunication of reactor 1, pencil 16 passes through the circulating pump and communicates with charge device 14, has placed alkaline liquid in the charge device 14 for supply basicity, prevent to intake the environment in reactor 1 of destruction when pH is on the low side.
As shown in fig. 2, the reaction water outlet pipe 17 is arranged on the upper portion of the side wall of the reactor 1, the reaction water outlet pipe 17 is communicated with the inside of the reactor 1, the specific reaction water outlet pipe 17 is arranged near the water level line in the reactor 1, after the wastewater mixed liquor reacts in the reactor 1 and the anammox is completed, the treated wastewater mixed liquor is discharged through the water outlet pipe of the reactor 1, gas-liquid-solid three-phase separation is performed, finally the separated clear liquid is discharged, and the whole process of the denitrification reaction of the anammox is completed.
As shown in fig. 3 and 4, the separation system of the present embodiment includes a separator 8, a nested draft tube 9, a carding machine 10, a water outlet weir 11, a separation water inlet pipe 18 and a sludge discharge pipe 12, wherein the nested draft tube 9 is disposed in the middle of the separator 8, the nested draft tube 9 includes an outer tube 91 and an inner tube 92, the inner tube 92 is embedded in the outer tube 91 and protrudes from the outer tube 91, the bottom of the inner tube 92 abuts against the bottom of the separator 8, the sidewall of the bottom of the outer tube 91 is further provided with a circulation outlet 93, specifically, the inner diameter of the nested draft tube 9 is one third of the inner diameter of the separator 8, the inner diameter of the inner tube 92 is one third of the inner diameter of the outer tube 91, and the length of the inner tube 91 is two thirds of the length of the inner tube 92, so that the equal-division design can gradually decrease the flow rate of the inner circulation of the mixed liquid in the separation circulation process, thereby facilitating the subsequent low-rate sedimentation and separation of the muddy water; the inner and outer nested circulation arrangement of the nested guide shell 9 is to realize inner and outer circulation for upward flow degassing, thereby completing gas-solid separation.
The water level of the reactor 1 in the denitrification reaction system is higher than the water level of the separator 8 in the separation system, so that the mixed liquid treated by the reactor 1 flows out through the reaction water outlet pipe 17 arranged at the upper part and has certain power, the separation water inlet pipe 18 at the lower part of the separator 8 penetrates through the separator 8 and is communicated with the bottom of the inner cylinder 92, the inlet of the separation water inlet pipe 18 is communicated with the outlet of the reaction water outlet pipe 17 through a pipeline, the mixed liquid of the reactor 1 enters the bottom of the inner cylinder 92 through the reaction water outlet pipe 17 and the separation water inlet pipe 18 due to the difference of high and low water levels, then the mixed liquid flows upwards along the inner cylinder 92, flows downwards along the annular area of the outer cylinder 91 after reaching the top and flows horizontally into the separator 8 at the circulating outlet 93 at the bottom of the outer cylinder 91, and is subjected to solid-liquid separation.
Because the anaerobic ammonia oxidation reaction of the mixed liquor is continued for a small part, nitrogen generated in the biochemical reaction has a plurality of micro bubbles entrained in sludge flocs, and the mixed liquor can be gradually and actively removed in the rising process; a small part of sludge carries a small amount of micro-bubbles in the sludge flocs due to the capillary action, so that the sludge cannot naturally settle and floats on the liquid level surface in the nested guide cylinder 9; as shown in fig. 4-5, the carding machine 10 is horizontally arranged on the upper part of the nested draft tube 9, part of the carding machine 10 is arranged in the nested draft tube 9, the specific carding machine 10 comprises a power device 103, a bracket 102, carding bars 101 and a bevel scraper 104, the power device 103 comprises a driving motor and a speed reducer, an output spindle of the speed reducer is connected with the bracket 102, as shown in fig. 7, the bracket 102 is two cross brackets 102 which are arranged vertically to each other, as shown in fig. 5 and 7, the carding bars 101 are arranged on the bracket 102 in a vertical downward array, the carding bars 101 are arranged in two groups, one group of carding bars 101 is arranged in the nested draft tube 9, one group of carding bars 101 is arranged between the separator 8 and the nested draft tube 9, and an outer cylinder 91 of the nested draft tube 9 is arranged between the two groups of bars, so that the carding bars 101 of the carding machine 10 can rotate up and down on the liquid level surfaces in the nested draft tube 9 and the separator 8, specifically, under the driving of a motor, four groups of carding bars 101 repeatedly and continuously rotate on the liquid level of the separator 8 in a synchronous horizontal plane circumference manner, floating sludge or scum on the liquid level is disturbed to promote the floating sludge or scum to remove bubbles contained in flocs, the sludge is driven to move downwards in a gap between an inner cylinder and an outer cylinder of the nested guide cylinder 9, and then tiny bubbles are gradually stripped, so that primary degassing is completed.
As shown in fig. 5 and 8, the primary degassing is completed by the cooperation of the nested draft tube 9 and the carding machine 10, in order to better enable the degassed mixed liquid to flow out of the inner cylinder 92 and then move downwards along the gap between the inner cylinder and the outer cylinder, in the embodiment, the carding grid strips 101 in the nested draft tube 9 are provided with the bevel scrapers 104, the bevel scrapers 104 and the carding grid strips 101 are distributed in a 45-degree crossed manner, and the bevel scrapers 104 are arranged between the water level line and the scum layer in the reactor 1, so that part of the sludge on the surface can be forcibly driven by the bevel scrapers 104 on the carding machine 10 to enter the gap between the inner cylinder and the outer cylinder and move downwards together, and enter the precipitation separation area along with the mixed liquid.
After entering the precipitation separation area, the mixed liquid flows out of the circulation outlet 93 of the outer cylinder 91 and enters the separator 8, the area of the sludge precipitation area is counted and calculated through tests, the control of the embodiment is 0.2-0.35 m/hr, the settling velocity of the sludge is generally 0.5-0.9 m/hr, the ascending flow velocity of the water flow is smaller than the settling velocity of the sludge, therefore, the dispersed sludge flocs gradually form large flocs, the sludge and water are naturally settled to the bottom of the separator 8 by the action of gravity to realize sludge-water separation, and the surface of the gravity precipitation separation area is also provided with carding grid bars 101 to disturb small bubbles possibly existing in scum to remove the impurities in the flocs, so as to form precipitable sludge flocs.
This embodiment is provided with sludge discharge pipe 12 in the bottom of separator 8, a mud for the bottom is precipitated in the discharge separation, still be provided with return sludge pipe 6 in 1 bottom both sides of reactor, return sludge pipe 6 passes through sludge reflux pump 13 and sludge discharge pipe 12 intercommunication, the mud that deposits like this is through the collection back of sludge discharge pipe 12, the mud evenly distributed who sends the backward flow by sludge reflux pump 13 continues biochemical reaction in reactor 1, can also wash the dead angle of 1 bottom of reactor simultaneously, avoid the siltation and the hardening of mud here, the clear solution that has realized mud-water separation after the sediment then passes through play weir 11 discharge separator 8, accomplish anaerobic ammonia oxidation's denitrogenation reaction process.
As shown in fig. 6, the effluent weir 11 of this embodiment is disposed on the inner wall of the upper part of the separator 8, for discharging the final separated clear liquid, and also preventing the sludge with entrained micro-bubbles from entering the effluent weir 11, because in the sedimentation separation zone, a small amount of sludge still can not separate the internal micro-bubbles and can move upwards along with the water flow, in order to prevent the physical interference of the equipment, there is a gap between the effluent weir 11 and the carding machine 10, and a small amount of sludge with internal micro-bubbles can flow into the effluent weir 11 through the direct gap between the carding machine 10 and the effluent weir 11, resulting in incomplete solid-liquid separation, therefore, other structures need to be disposed on the effluent weir 11 for blocking, the effluent weir 11 of this embodiment includes an effluent weir groove 111, a shielding plate 114, a slag blocking plate 113 and a triangular guide plate 112, wherein the effluent weir groove 111 is disposed inside the separator housing 81, the effluent weir groove 111 is an annular effluent weir groove 111, the top of the water outlet weir groove 111 is level with the water level, the lower part of the water outlet weir groove 111 is a chute folded towards the separator shell 81, and the clear liquid flows into the water outlet weir groove 111 and then flows out of the water outlet weir 11 in an inclined way; the inner side of the water outlet weir notch 111 is provided with a slag trap 113, the slag trap 113 is arranged in parallel with the upper part of the water outlet weir notch 111, the slag trap 113 is higher than the water outlet weir notch 111 and the water level line, the lower part of the slag trap 113 is connected with a shielding plate 114, the other end of the shielding plate 114 is arranged in parallel with the chute at the lower part of the water outlet weir notch 111, thus a separated liquid flow channel is formed between the slag trap 113 and the shielding plate 114 and the water outlet weir notch 111 for discharging the actual clear liquid, the shielding plate 114 and the water outlet weir notch 111 are both folded towards the side of the separator shell 81, thus the sludge containing micro-bubbles rising from the bottom can be blocked, because the slag trap 113 is higher than the water level line, the liquid containing micro-bubbles on the water level line at the side of the carding machine 10 can not enter the water outlet weir notch 111 through the blocking of the slag trap 113, the normally rising sludge containing micro-bubbles can be blocked by the slag trap 113 and turned towards the carding machine 10 for bubbling, the sludge containing the fine bubbles rising along the inner wall of the separator 8 cannot be stopped by the slag trap 113 and the shielding plate 114, therefore, in this embodiment, the separator casing 81 is provided with a triangular guide plate 112, the triangular guide plate 112 protrudes along the inside of the separator casing 81 and is connected to the weir groove 111 at the upper part, the height of the triangular guide plate 112 protruding from the separator casing 81 is the same as the width of the weir groove 111, thus, the sludge containing micro-bubbles on the inner wall side of the reactor 1 is guided to the shielding plate 114 by the action of the triangular guide plate 112 in the process of rising again, and further guided to the lower part of the carding machine 10 for carding bubbles, the micro-bubbles are gradually stripped under the continuous carding action of the carding bars 101 of the carding machine 10, the sludge is precipitated to the bottom of the separator 8 again, and the sludge is collected and then sent back to the reactor 1 to continuously and circularly carry out the biochemical denitrification reaction of anaerobic ammonia oxidation.
The dynamic circulation anaerobic ammonium oxidation biological denitrification system has the characteristics of high COD (chemical oxygen demand) and high ammonia nitrogen content of garbage percolate, kitchen biogas slurry and the like, and a stable biochemical reaction environment is established in the reactor by adopting large circulation flow; the dissolved oxygen level in the reactor is controlled by adopting limited aeration and zone aeration; controlling the temperature of the mixed liquid in the reactor by using a heat exchanger for circulating heating/cooling; the sludge backflow adopts measures such as a multipoint backflow mode without dead angles and the like, and creates suitable conditions for anaerobic ammonia oxidation reaction. The separator adopts a secondary degassing area to ensure that floating sludge carrying micro bubbles is fully degassed, precipitated and reflows to the reactor, and a carding machine of a surface carding device is adopted to carry out uninterrupted carding and disturbance on the floating sludge carrying micro bubbles so as to promote the separation of the sludge and the internal micro bubbles; the effluent weir of the separator is provided with a shielding and flow guiding component, so that floating sludge can not enter the effluent weir but is concentrated to a carding machine in a secondary degassing area for degassing, and the sludge can be completely left in the separator for precipitation and flows back to the reactor, thereby realizing dynamic cyclic denitrification, improving the sewage treatment efficiency and reducing the sewage treatment cost.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.
Claims (10)
1. A dynamic circulation anaerobic ammonium oxidation biological denitrification system is characterized in that: comprises a denitrification reaction system and a separation system;
the denitrification reaction system comprises a reactor, a circulating guide cylinder, an aerator, a water inlet pipe and a reaction water outlet pipe;
the circulating guide cylinder is arranged in the middle of the reactor, and a water circulating space is arranged between the bottom of the circulating guide cylinder and the bottom of the reactor;
an aerator disposed at the bottom of the reactor, the aerator comprising a central aerator disposed below the circulation draft tube;
the water inlet pipe is arranged on the side wall of the reactor and communicated with the interior of the reactor;
the reaction water outlet pipe is arranged on the upper part of the side wall of the reactor and is communicated with the inside of the reactor;
and the separation system is used for separating gas, liquid and solid phases of the mixed liquid of the wastewater discharged by the reaction water outlet pipe.
2. The dynamic circulation anammox biological denitrification system according to claim 1, wherein: the separation system comprises a separator, a nested guide shell, a carding machine, a water outlet weir, a separation water inlet pipe and a sludge discharge pipe;
the nested guide cylinder is arranged in the middle of the separator and comprises an outer cylinder and an inner cylinder, the inner cylinder is embedded in the outer cylinder, the bottom of the inner cylinder protrudes out of the outer cylinder, the bottom of the inner cylinder is abutted against the bottom of the separator, and a circulating outlet is further formed in the side wall of the bottom of the outer cylinder;
the carding machine is horizontally arranged at the upper part of the nested guide shell, and part of the carding machine is arranged in the nested guide shell;
the water outlet weir is arranged on the inner wall of the upper part of the separator and is used for discharging clear liquid of mud-water separation;
the separation water inlet pipe penetrates through the separator and is communicated with the bottom of the inner barrel, and an inlet of the separation water inlet pipe is communicated with an outlet of the reaction water outlet pipe through a pipeline;
and the sludge discharge pipe is arranged at the bottom of the separator and used for discharging and separating sludge precipitated to the bottom.
3. The dynamic circulation anammox biological denitrification system according to claim 2, wherein: and return sludge pipes are arranged on two sides of the bottom of the reactor and are communicated with the sludge discharge pipe through a sludge return pump.
4. The dynamic circulation anammox biological denitrification system according to claim 1 or 3, wherein: the aerator also comprises peripheral aerators which are arranged at the bottom of the reactor and positioned at two sides of the circulating guide cylinder;
and a lifting device is further arranged in the circulating guide cylinder, and the lifting device drives a paddle folding type stirrer through a motor to lift the liquid in the circulating guide cylinder.
5. The dynamic circulation anammox biological denitrification system according to claim 4, wherein:
a dissolved oxygen sensor, a pH sensor and a temperature sensor are arranged in the circulating guide cylinder;
and a dissolved oxygen sensor, an oxidation-reduction potential sensor, a pH sensor and a temperature sensor are arranged between the circulating guide cylinder and the reactor.
6. The dynamic circulation anammox biological denitrification system according to claim 5, wherein: a heat exchanger is arranged outside the reactor and is communicated with the inside of the reactor through a circulating pump; the reactor is characterized in that a chemical feeding pipe is further arranged on a water inlet pipe of the reactor and is communicated with a chemical feeding device through a circulating pump, and alkaline liquid is placed in the chemical feeding device.
7. The dynamic circulation anammox biological denitrification system according to claim 2, wherein: the carding machine comprises a power device, a bracket, carding grids and a bevel scraper;
the power device comprises a driving motor and a speed reducer, and an output main shaft of the speed reducer is connected with a support;
the support is two cross supports which are vertically arranged;
the carding grid bars are vertically and downwards arranged on the support in an array mode, two groups of carding grid bars are arranged, one group of carding grid bars are arranged in the nested guide cylinder, and one group of carding grid bars are arranged between the separator and the nested guide cylinder;
the bevel scraper blade is arranged on the carding grid bars in the nested guide shell, the bevel scraper blade and the carding grid bars are crossed and distributed at an acute angle, and the bevel scraper blade is arranged between a water level line and a scum layer in the reactor.
8. The dynamic circulation anammox biological denitrification system according to claim 2 or 7, wherein: the water outlet weir comprises a water outlet weir groove, a slag baffle, a shielding plate and a triangular guide plate;
the water outlet weir groove is arranged on the inner side of the separator shell, the water outlet weir groove is an annular water outlet weir groove, the top of the water outlet weir groove is level with a water level line, and the lower part of the water outlet weir groove is a chute folded towards the separator shell;
the slag trap is arranged on the inner side of the water outlet weir groove, the slag trap is higher than the water outlet line, and the slag trap is arranged in parallel with the upper part of the water outlet weir groove;
the shielding plate is connected with the lower part of the slag trap, the other end of the shielding plate is parallel to the chute at the lower part of the water outlet weir groove, and a separation liquid flow passage is arranged among the shielding plate, the slag trap and the water outlet weir groove;
the triangular guide plate is arranged on the separator shell and is connected with the water outlet weir groove on the upper portion, the triangular guide plate protrudes along the inner side of the separator shell, and the height of the separator shell is equal to the width of the water outlet weir groove.
9. The dynamic circulation anammox biological denitrification system according to claim 1, wherein: the inner diameter of the circulating guide cylinder is smaller than the radius of the reactor, and the top of the circulating guide cylinder is higher than the water level line of the reactor.
10. The dynamic circulation anammox biological denitrification system according to claim 2, wherein: the inner diameter of the nested guide shell is smaller than the radius of the separator, the inner diameter of the inner shell is one third of the inner diameter of the outer shell, and the length of the outer shell is larger than half of the length of the inner shell.
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