CN104628132A - Autotrophic denitrification based integrated novel denitrification reaction device and technological process thereof - Google Patents
Autotrophic denitrification based integrated novel denitrification reaction device and technological process thereof Download PDFInfo
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- CN104628132A CN104628132A CN201510053488.9A CN201510053488A CN104628132A CN 104628132 A CN104628132 A CN 104628132A CN 201510053488 A CN201510053488 A CN 201510053488A CN 104628132 A CN104628132 A CN 104628132A
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Abstract
The invention discloses an autotrophic denitrification based integrated novel denitrification reaction device and a technological process thereof, belonging to the technical field of water pollution control. The device comprises a reactor main body, a water feeding system, a water draining system, a sludge removal system, and an aeration and oxygen-limiting system, wherein the reactor main body is concentric cylinder-shaped, an inner ring is an aerobic reaction area, an outer ring is a middle precipitation area and an autotrophic denitrification area, and the inner side walls of the middle precipitation area and the autotrophic denitrification area of the outer ring are the outer side wall of the aerobic reaction area of the inner ring; a porous carrier bearing plate is arranged in the aerobic reaction area, and an organic biofilm carrier is filled in the porous carrier bearing plate; and a porous carrier bearing plate is arranged in the autotrophic denitrification area, and a micro-electrolysis carrier is filled in the porous carrier bearing plate. According to the invention, when the carbon nitrogen ratio of sewage is relatively low, an organic carbon source is not required to be additionally added, so that compared with traditional autotrophic denitrification based denitrification processes, the device disclosed by the invention can control the concentration of organic matters in drained water better, and can be used for saving the operating cost produced by the addition of the organic carbon source.
Description
Technical field
The present invention relates to the novel denitrogenation reactor of integration based on autotrophic denitrification and processing method, belong to technical field of water pollution control.
Background technology
Nitrogen pollutant is one of major reason causing body eutrophication, and polluted by nitrogen controls to be the water environmental problems needing solution in current China and even world wide badly.
Nitrogen pollutant in the polluted-water such as sanitary sewage, contaminated surface water is based on ammonia nitrogen, nitrate, the ultimate principle of standard biologic denitrifying method is: ammonia nitrogen is oxidized to nitrite under the effect of ammonia oxidation bacteria (AOB), and then is oxidized to nitrate under the effect of NOB (NOB); Nitrate is reduced to nitrogen and discharges water body under the effect of denitrifying bacteria, thus thoroughly denitrogenation.Usually, in water technology, utilize heterotrophic denitrification effect, namely need to take organism as electron donor, provide carbon source and the energy to microorganism growth.But, for sewage, waste water and contaminated natural water that carbon-nitrogen ratio (COD/N) is lower, then need (as to add sodium acetate, methyl alcohol etc. by additionally adding organism, or a certain amount of sewage containing higher concentration organic pollutant of proportioning) promote heterotrophic denitrification process, because sewage treatment process is subject to the combined influence of Various Complex factor, the dosage of organic carbon source is wayward, easily cause there is the problems such as organic substance residues in water outlet, in addition, therefore running cost also can increase.
Different with heterotrophic denitrifying Bacteria, autotrophic denitrification bacterium can with the inorganics such as hydrogen, sulphur for electron donor, and with inorganic carbon (CO
2or
) be carbon source, complete the conversion of nitrate to nitrogen.Based on the denitrification process of autotrophic denitrification process, without the need to adding organic carbon source and mud generation is less, have a good application prospect, but, be lessly at present able to development and application.One of its key issue is the electron donor source of autotrophic denitrification bacterium, if add hydrogen, sulfide etc., it is improper to control, and can introduce new problem (as inflammable and explosive in hydrogen, sulfide is introduced and polluted).Utilize the electron transmission that light electrolysis carrier self produces, for autotrophic denitrification bacterium provides electron donor, and then the water technology realizing denitrogenation rarely has report.In addition, also certain density organism must can be there is in actual polluted-water, from multiple angles such as technological principle, device structure, control elementss, ammonia nitrogen, nitrate and organic integrated reacting device and processing method are removed in exploitation simultaneously, have applications well prospect and important practical usage.
Summary of the invention
In order to overcome the shortcoming of prior art, the object of the invention is to develop a kind of control effects good, the novel denitrogenation reactor of the integration based on autotrophic denitrification that floor space is little and processing method, the aerobic microbiological of enrichment on organic-biological membrane carrier is utilized to complete oxidation operation, ammonia oxidation and nitrite-oxidizing process, the autotrophic denitrification microorganism of enrichment on light electrolysis carrier is utilized to be nitrogen by nitrate transformation further, thus under the condition without the need to adding the allogenic material such as organism or hydrogen, realize ammonia nitrogen in polluted-water, nitrate and organic while, effective removal.
To achieve these goals, the technical solution used in the present invention is:
The novel denitrification reaction processing method of integration based on autotrophic denitrification, comprises the following steps;
Sewage successively enters aerobic reactor zone, intermediate sedimentation district and autotrophic denitrification district by water inlet system, first the oxidising process of organism, ammonia nitrogen and nitrite is realized, and then realize the conversion process that the precipitation of aerobic sludge, reflux course and nitrate reduction generate nitrogen, finally discharged by outlet system.
Organic biofilm carrier is filled with suspension form in aerobic reactor zone, inoculated by active sludge and cultivate biofilm, on organic-biological membrane carrier, enrichment has oxidation operation, the heterotrophism aerobic microbiological of ammonia oxidation and nitrite-oxidizing function, the microorganism such as ammonia oxidation bacteria and NOB, utilize microbial process to be carbonic acid gas by the organic substance decomposing in water inlet, and be nitrate by ammonium oxidation.
Intermediate sedimentation district arranges water conservancy diversion plate washer and backflow seam, utilizes flow apron to reduce flow rate of water flow and aerobic reactor zone is generated and the surplus mud flowed out precipitation and discharge, utilize backflow seam by settling region to aerobic reactor zone returned sluge.
Light electrolysis carrier is filled with fixed bed form in autotrophic denitrification reaction zone, inoculated by active sludge and cultivate biofilm, enrichment autotrophic denitrification bacterium on light electrolysis carrier, the micro-electrolysis reaction of carrier is utilized to produce electron transmission, for the denitrification process of autotrophic denitrification bacterium provides electronics, reduction nitrate, to nitrogen, realizes the thorough removal of nitrogen pollutant in water.
Organic-biological membrane carrier in aerobic reactor zone can be made porous by macromolecule organic materials such as polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP) and material modified, urethane (PU) thereof and be easy to the various shape such as spherical, block of biofilm.
Arrange aerating system in aerobic reactor zone, the microorganism for enrichment on organic-biological membrane carrier provides sufficient oxygen.Water outlet dividing plate is set in aerobic reactor zone, to retain organic-biological membrane carrier.
Light electrolysis carrier in autotrophic denitrification district is fired and is shaped into the shapes such as spherical, block after can being mixed by iron powder and carbon dust.On light electrolysis carrier in autotrophic denitrification district, except autotrophic denitrification bacterium, also can enrichment heterotrophic denitrifying Bacteria, heterotrophism aerobic bacteria, other kind of quasi-microorganism such as ammonia oxidation bacteria and NOB, act synergistically with autotrophic denitrification bacterium and realize the common removal of nitrogen pollutant and organic pollutant.
Autotrophic denitrification reaction zone comprises conversion zone and water exit end.Limit oxygen system is set in the conversion zone of autotrophic denitrification reaction zone, for the microorganism of enrichment on light electrolysis carrier provides limited oxygen condition.Limit oxygen system monitors dissolved oxygen concentration by dissolved oxygen probe, when dissolved oxygen concentration is too high, regulates aeration rate by automatic control system, to ensure that the dissolved oxygen concentration of autotrophic denitrification conversion zone is at below 3mg/L.In the water exit end of autotrophic denitrification reaction zone, aerating system is set, removes residual ammonia nitrogen and organism further.
The novel denitrogenation reactor of integration based on autotrophic denitrification, comprises reactor body, water inlet system, outlet system, mud removal system, aeration and limit oxygen system;
Reactor body is concentric cylindrical, and inner ring is aerobic reactor zone, and outer shroud is intermediate sedimentation district and autotrophic denitrification district, and the inner edge wall in outer shroud intermediate sedimentation district and autotrophic denitrification district is the outside wall of inner ring aerobic reactor zone;
Arrange porous support supporting plate in aerobic reactor zone, it fills organic biofilm carrier, and between aerobic reactor zone and intermediate sedimentation district, top arranges the first effluent weir, and bottom arranges backflow seam; Arrange flow apron between intermediate sedimentation district and autotrophic denitrification district, top arranges the second effluent weir; Porous support supporting plate is set in autotrophic denitrification district, it fills light electrolysis carrier;
Water inlet system comprises intake pump, suction culvert, inlet valve and water distribution system; Intake pump, inlet valve are arranged at outside reactor body, and are connected to water distribution system by suction culvert; Water distribution system is arranged at bottom the aerobic reactor zone in reactor body, is positioned on the aeration head of aerobic zone, under porous support supporting plate;
Outlet system comprises final outflow water weir and outlet pipeline; Final outflow water weir is arranged at the water exit end top, autotrophic denitrification district of reactor body, and is connected with the outlet pipeline be arranged at outside reactor body;
Mud removal system comprises sludge funnel, spoil disposal valve and mud line; Sludge funnel is arranged at bottom the intermediate sedimentation district of reactor body, in inverted trapezoidal, and is connected with the mud line be arranged at outside reactor body by spoil disposal valve;
Aeration and limit oxygen system comprise aerobic reactor zone aerating system, autotrophic denitrification district conversion zone limit oxygen system and autotrophic denitrification district water exit end aerating system; Aerobic reactor zone aerating system comprises aerobic zone aeration head, aerobic zone aerating pipelines, aerobic zone aeration valve and aerobic zone air compressor; Aerobic zone aeration head is arranged at bottom aerobic reactor zone, is positioned under water distribution system, is connected with aerobic zone aeration valve by aerobic zone aerating pipelines with the aerobic zone air compressor be positioned at outside reactor body; Autotrophic denitrification district conversion zone limit oxygen system comprises micro-aeration head, limit oxygen section aerating pipelines, adjustable gate, limit oxygen section air compressor, dissolved oxygen monitoring probe and aeration automatic control device;
Micro-aeration head is arranged at bottom autotrophic denitrification district conversion zone, is positioned under porous support supporting plate, is connected with adjustable gate by limit oxygen section aerating pipelines with the limit oxygen section air compressor be positioned at outside reactor body;
Aeration automatic control device and the dissolved oxygen monitoring probe being positioned at autotrophic denitrification district with limit oxygen section air compressor and be connected, autotrophic denitrification district water exit end aerating system comprises water exit end aeration head, water exit end aerating pipelines, water exit end aeration valve and water exit end air compressor; Water exit end aeration head is arranged at bottom autotrophic denitrification district water exit end, is positioned under porous support supporting plate, is connected with water exit end aeration valve by water exit end aerating pipelines with the water exit end air compressor be positioned at outside reactor body.
From the angle effectively ensureing effluent quality and saving cost of floor space, for realizing the novel denitrification process of integration based on autotrophic denitrification, invention also provides the novel denitrogenation reactor of integration based on autotrophic denitrification, compared with prior art, the invention has the beneficial effects as follows:
(1), based on denitrification process and the reaction unit of autotrophic denitrification exploitation, when sewage carbon-nitrogen ratio lower (namely organism is not enough), without the need to additionally adding organic carbon source, compared with traditional denitrification process based on heterotrophic denitrification, better can controlling the organic concentration in water outlet, the running cost produced because adding organic carbon source can being saved simultaneously.
(2), compared with heterotrophic microorganism, the multiplication rate of autotrophic microorganism is lower, and in the present invention, adopt the microorganism enriched form of carrier biofilm, the surplus sludge volume produced is less compared with traditional denitrification process (as front establishment method), alleviates follow-up sludge treatment burden.
(3), limit oxygen system be have employed to autotrophic denitrification district, utilize aeration automatic control device, accurately can control the dissolved oxygen concentration of different zones in reactive system, by the conversion zone Dissolved Oxygen concentration Control in autotrophic denitrification district at below 3mg/L, the competitive capacity of denitrifying microorganism can be strengthened, realize the conversion of nitrate to nitrogen more efficiently, by the water exit end Dissolved Oxygen concentration Control in autotrophic denitrification district at 3 ~ 5mg/L, the organism that may remain in water outlet and ammonia nitrogen are removed further, significantly can improve effluent quality.
(4), adopt the integrated reacting device of concentric cylindrical, can save occupation of land, ground mo(u)ld bottom half construction is more conducive to reaction unit insulation.Especially, by the design of inlet and outlet system and dividing plate, vertical flow lifting type current are formed in aerobic reactor zone, annular pulling flow type current are formed in intermediate sedimentation district and autotrophic denitrification district, be more conducive to subregion and the control by stages of aeration and limit oxygen system, to meet the different stepss such as oxidation operation decomposition, ammonium oxidation, nitrate anoxic denitrification to the different demands of oxygen.
(5), in autotrophic denitrification district fill light electrolysis carrier with fixed bed form, after microorganism colonization growth, being separated of hydraulic detention time and sludge retention time can be realized, enhance and the effect of denitrification process is controlled.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by referring to detailed description below, more completely can understand the present invention better and easily learn wherein many adjoint advantages, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention, as schemed wherein:
Fig. 1 is the novel denitrification process flow process of integration based on autotrophic denitrification and schematic diagram;
Fig. 2 is the novel denitrogenation reactor appearance assumption diagram of integration based on autotrophic denitrification;
Fig. 3 is the novel denitrogenation reactor orthographic plan of integration based on autotrophic denitrification;
Fig. 4 is the novel denitrogenation reactor cross section A-A figure of integration based on autotrophic denitrification;
Fig. 5 is the novel denitrogenation reactor section B-B figure of integration based on autotrophic denitrification;
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment
Obviously, the many modifications and variations that those skilled in the art do based on aim of the present invention belong to protection scope of the present invention.
Embodiment 1: as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, the novel denitrogenation reactor of the integration based on autotrophic denitrification, comprises reactor body, water inlet system, outlet system, mud removal system, aeration and limit oxygen system.
Reactor body is concentric cylindrical, and inner ring is aerobic reactor zone 1, and outer shroud is intermediate sedimentation district 2 and autotrophic denitrification district 3, can be ground mo(u)ld bottom half, semi-underground type or ground mo(u)ld top half.The aspect ratio of inner ring aerobic reactor zone 1 can be 1:0.5 ~ 1:10, and concrete size is determined according to the process water yield and land area design.The inner edge wall in outer shroud intermediate sedimentation district 2 and autotrophic denitrification district 3 is the outside wall of inner ring aerobic reactor zone 1, aspect ratio inner ring aerobic reactor zone 1 is slightly high, external diameter can be 1.5 ~ 5 times of inner ring aerobic reactor zone 1 diameter, and concrete size is determined according to the process water yield and water quality characteristic such as water inlet carbon-nitrogen ratio design.The volumetric ratio in intermediate sedimentation district 2 and autotrophic denitrification district 3 can be 1:10 ~ 1:3, and concrete size is determined according to the process water yield and water quality characteristic design.It is autotrophic denitrification district conversion zone 3a and autotrophic denitrification district water exit end 3b that autotrophic denitrification distinguishes 3, and volumetric ratio can be 10:1 ~ 5:1, and concrete size is determined according to the process water yield and water quality characteristic design.
Arrange porous support supporting plate 14 in aerobic reactor zone 1, it fills organic biofilm carrier 4, and between aerobic reactor zone 1 and intermediate sedimentation district 2, top arranges the first effluent weir 6, and bottom arranges backflow seam 7.Arrange flow apron 8 between intermediate sedimentation district 2 and autotrophic denitrification district 3, top arranges the second effluent weir 9.Porous support supporting plate 14 is set in autotrophic denitrification district 3, it fills light electrolysis carrier 5.
Water inlet system comprises intake pump 10, suction culvert 11, inlet valve 12 and water distribution system 13.Intake pump 10, inlet valve 12 are arranged at outside reactor body, and are connected to water distribution system 13 by suction culvert 11.Water distribution system 13 is arranged at bottom the aerobic reactor zone 1 in reactor body, is positioned on aerobic zone aeration head 15, under porous support supporting plate 14, can adopt the forms such as single-point water distribution, multiple spot water distribution or perforated pipe water distribution according to aerobic reactor zone 1 scale.
Outlet system comprises final outflow water weir 29 and outlet pipeline 30.Final outflow water weir 29 is arranged at the water exit end 3b top, autotrophic denitrification district of reactor body, and is connected with the outlet pipeline 30 be arranged at outside reactor body.
Mud removal system comprises sludge funnel 31, spoil disposal valve 32 and mud line 33.Sludge funnel 31 is arranged at bottom the intermediate sedimentation district 2 of reactor body, in inverted trapezoidal, and is connected with the mud line 33 be arranged at outside reactor body by spoil disposal valve 32.
Aeration and limit oxygen system comprise aerobic reactor zone aerating system, autotrophic denitrification district conversion zone limit oxygen system and autotrophic denitrification district water exit end aerating system.Aerobic reactor zone aerating system comprises aerobic zone aeration head 15, aerobic zone aerating pipelines 16, aerobic zone aeration valve 17 and aerobic zone air compressor 18.Aerobic zone aeration head 15 is arranged at bottom aerobic reactor zone 1, is positioned under water distribution system 13, is connected with aerobic zone aeration valve 17 by aerobic zone aerating pipelines 16 with the aerobic zone air compressor 18 be positioned at outside reactor body.Autotrophic denitrification district conversion zone limit oxygen system comprises micro-aeration head 19, limit oxygen section aerating pipelines 20, adjustable gate 21, limit oxygen section air compressor 22, dissolved oxygen monitoring probe 23 and aeration automatic control device 24.
Micro-aeration head 19 is arranged at bottom autotrophic denitrification district conversion zone 3a, is positioned under porous support supporting plate 14, is connected with adjustable gate 21 by limit oxygen section aerating pipelines 20 with the limit oxygen section air compressor 22 be positioned at outside reactor body.
Aeration automatic control device 24 and the dissolved oxygen monitoring probe 23 being positioned at autotrophic denitrification district 3 with limit oxygen section air compressor 22 and be connected, by regulating limit oxygen section air compressor 22 aeration pressure and flow, in the conversion zone in control autotrophic denitrification district 3, dissolved oxygen is lower than 3mg/L.Autotrophic denitrification district water exit end aerating system comprises water exit end aeration head 25, water exit end aerating pipelines 26, water exit end aeration valve 27 and water exit end air compressor 28.Water exit end aeration head 25 is arranged at bottom autotrophic denitrification district water exit end 3b, is positioned under porous support supporting plate 14, is connected with water exit end aeration valve 27 by water exit end aerating pipelines 26 with the water exit end air compressor 28 be positioned at outside reactor body.
Embodiment 2: as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, the novel denitrogenation reactor of integration based on autotrophic denitrification, comprises water inlet system, aerobic reactor zone, intermediate sedimentation district, autotrophic denitrification reaction zone, outlet system, aeration and limit oxygen system.
First sewage enter aerobic reactor zone by water inlet system, what in aerobic reactor zone, utilize enrichment on organic-biological membrane carrier has oxidation operation, the heterotrophism aerobic microbiological of ammonia oxidation and nitrite-oxidizing function, the microorganism such as ammonia oxidation bacteria and NOB, being carbonic acid gas by the organic substance decomposing in water inlet, and is nitrate by ammonium oxidation.The water outlet of aerobic reactor zone enters intermediate sedimentation district, the precipitation of mud, precipitating sludge occurs to the discharge of aerobic reactor zone backflow and excess sludge.The water outlet in intermediate sedimentation district enters autotrophic denitrification district, utilize the electron transmission that the autotrophic denitrification bacterium of enrichment on light electrolysis carrier and carrier micro-electrolysis reaction produce, for the denitrification process of autotrophic denitrification bacterium provides electronics, reduction nitrate, to nitrogen, realizes the thorough removal of nitrogen pollutant in water.The water outlet in autotrophic denitrification district is discharged by outlet system.Aerobic reactor zone and autotrophic denitrification district are provided by aeration and limit oxygen system and are controlled the oxygen needed for microbial reaction respectively, sufficient oxygen is provided in aerobic reactor zone, dissolved oxygen concentration is lower than 3mg/L to provide limited oxygen condition to ensure at the conversion zone of autotrophic denitrification reaction zone, water exit end in autotrophic denitrification reaction zone provides oxygen guarantee dissolved oxygen concentration at 3-5mg/L further, thus effective guarantee effluent quality.
Fig. 2, Fig. 3, Fig. 4 and Fig. 5 are respectively based on the novel denitrogenation reactor appearance assumption diagram of integration of autotrophic denitrification, orthographic plan and sectional view.This device comprises reactor body, water inlet system, outlet system, mud removal system, aeration and limit oxygen system.
To process somewhere low ratio of carbon to ammonium sanitary sewage, designing treatment sewage quantity 25m3/d, ammonia nitrogen in sewage concentration 40 ~ 50mg/L, COD concentration 80 ~ 100mg/L, the present invention is specifically implemented as follows:
Reactor body is concentric cylindrical, and inner ring is aerobic reactor zone 1, and outer shroud is intermediate sedimentation district 2 and autotrophic denitrification district 3, and reactor body is semi-underground type, and Steel Concrete is built.External diameter 3.6m, floor space 10.2m2.Total reactor height 1.8m, on the ground 0.8m, underground 1m, wherein available depth 1.5m.The aspect ratio of inner ring aerobic reactor zone 1 is 3:2, the outside wall inside diameter 1.2m of inner ring aerobic reactor zone 1, wall thickness 0.4m, outside diameter 1.6m.The inner edge wall in outer shroud intermediate sedimentation district 2 and autotrophic denitrification district 3 is the outside wall of inner ring aerobic reactor zone 1.The outside wall inside diameter 3m in outer shroud intermediate sedimentation district 2 and autotrophic denitrification district 3, is 2.5 times of wall inside diameter outside inner ring aerobic reactor zone 1, the outside wall wall thickness 0.6m in outer shroud intermediate sedimentation district 2 and autotrophic denitrification district 3, outside diameter 3.6m.The volumetric ratio in intermediate sedimentation district 2 and autotrophic denitrification district 3 is 1:8.It is autotrophic denitrification district conversion zone 3a and autotrophic denitrification district water exit end 3b that autotrophy autotrophic denitrification distinguishes 3, and volumetric ratio is 10:1.
Porous support supporting plate 14 is set in aerobic reactor zone 1, can be made up of metal or other materials, it fills organic biofilm carrier 4, can porous be made by macromolecule organic materials such as polyurethane PUs and be easy to the spherical of biofilm.Arrange bottom aerobic reactor zone 1 and connect water inlet system, comprising intake pump 10, suction culvert 11, inlet valve 12 and water distribution system 13.Water distribution system 13 is arranged at bottom the aerobic reactor zone 1 in reactor body, is positioned on aerobic zone aeration head 15, under porous support supporting plate 14, adopts single-point water distribution form according to aerobic reactor zone 1 scale.Intake pump 10, inlet valve 12 are arranged at outside reactor body, and are connected to water distribution system 13 by suction culvert 11.Also arrange bottom aerobic reactor zone 1 and connect aerating system, comprising aerobic zone aeration head 15, aerobic zone aerating pipelines 16, aerobic zone aeration valve 17 and aerobic zone air compressor 18.Aerobic zone aeration head 15 is arranged at bottom aerobic reactor zone 1, be positioned under water distribution system 13, be connected with the aerobic zone air compressor 18 be positioned at outside reactor body with aerobic zone aeration valve 17 by aerobic zone aerating pipelines 16, in aerobic reactor zone 1, microbial reaction provides sufficient oxygen.Water inlet enters bottom aerobic reactor zone 1 by water distribution system 13, and by the aeration effect of water flow pressure effect and aerobic zone aeration head 15, vertical up-flow current are formed in aerobic reactor zone 1, by organic-biological membrane carrier 4, with enrichment on it there is oxidation operation, the heterotrophism aerobic microbiological of ammonia oxidation and nitrite-oxidizing function, the microorganism such as ammonia oxidation bacteria and NOB react, make organic substance decomposing be carbonic acid gas, and make ammonium oxidation be nitrate.
Between aerobic reactor zone 1 and intermediate sedimentation district 2, top arranges the first effluent weir 6, and effluent weir width is 1/3 of aerobic reactor zone 1 and intermediate sedimentation district 2 reverse-concave.Between aerobic reactor zone 1 and intermediate sedimentation district 2, bottom arranges backflow seam 7, and precipitating sludge is refluxed to aerobic reactor zone 1 by intermediate sedimentation district 2.Arrange bottom intermediate sedimentation district 2 and connect mud removal system, comprising sludge funnel 31, spoil disposal valve 32 and mud line 33.Sludge funnel 31 is arranged at bottom the intermediate sedimentation district 2 of reactor body, in inverted trapezoidal, and is connected with the mud line 33 be arranged at outside reactor body by spoil disposal valve 32.Be gathered in the excess sludge in sludge funnel 31, get rid of to reactor body through spoil disposal valve 32 and mud line 33.Arrange flow apron 8 between intermediate sedimentation district 2 and autotrophic denitrification district 3, top arranges the second effluent weir 9, and current flow to autotrophic denitrification district 3 through flow apron 8 and the second effluent weir 9 from intermediate sedimentation district 2.
Porous support supporting plate 14 is set in autotrophic denitrification district 3, can be made up of metal or other materials, it fills light electrolysis carrier 5, after being mixed according to the ratio of 1:1 by iron powder and carbon dust, fire and be shaped into bulk.Autotrophic denitrification district 3 is divided into autotrophic denitrification district conversion zone 3a and autotrophic denitrification district water exit end 3b, and bottom arranges conversion zone limit oxygen system and water exit end aerating system respectively.Wherein conversion zone limit oxygen system comprises micro-aeration head 19, limit oxygen section aerating pipelines 20, adjustable gate 21, limit oxygen section air compressor 22, dissolved oxygen monitoring probe 23 and aeration automatic control device 24.Micro-aeration head 19 is arranged at bottom autotrophic denitrification district conversion zone 3a, is positioned under porous support supporting plate 14, is connected with adjustable gate 21 by limit oxygen section aerating pipelines 20 with the limit oxygen section air compressor 22 be positioned at outside reactor body.Aeration automatic control device 24 and the dissolved oxygen monitoring probe 23 being positioned at autotrophic denitrification district 3 with limit oxygen section air compressor 22 and be connected, by regulating limit oxygen section air compressor 22 aeration pressure and flow, in the conversion zone in control autotrophic denitrification district 3, dissolved oxygen is lower than 3mg/L, in autotrophic denitrification district conversion zone 3a, anoxic microbial reaction provides micro-oxygen conditions.Water exit end aerating system comprises water exit end aeration head 25, water exit end aerating pipelines 26, water exit end aeration valve 27 and water exit end air compressor 28.Water exit end aeration head 25 is arranged at bottom autotrophic denitrification district water exit end 3b, be positioned under porous support supporting plate 14, be connected with the water exit end air compressor 28 be positioned at outside reactor body with water exit end aeration valve 27 by water exit end aerating pipelines 26, for in autotrophic denitrification district water exit end 3b, microbial reaction provides sufficient oxygen, ensure that water outlet dissolved oxygen concentration is greater than 3mg/L.After current enter autotrophic denitrification district 3 by intermediate sedimentation district 2, under the ring structure guide functions of reactor body, annular plug-flow is formed in autotrophic denitrification district 3, by light electrolysis carrier 5, utilize the electron transmission that the autotrophic denitrification bacterium of enrichment on it and carrier micro-electrolysis reaction produce, reduction nitrate, to nitrogen, realizes the thorough removal of nitrogen pollutant in water, and removes residual organism and the ammonia nitrogen that may exist by the further aeration degree of depth of water exit end.
Water exit end 3b top, autotrophic denitrification district facility outlet system, comprises final outflow water weir 29 and outlet pipeline 30.The final outflow water weir 29 of current after process through being arranged at reactor body autotrophic denitrification district water exit end 3b is flowed out, and enters the outlet pipeline 30 be arranged at outside reactor body, discharges reactor body.
As mentioned above, embodiments of the invention are explained, but as long as do not depart from inventive point of the present invention in fact and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation is also all included within protection scope of the present invention.
Claims (8)
1., based on the novel denitrogenation reactor of integration of autotrophic denitrification, it is characterized in that comprising reactor body, water inlet system, outlet system, mud removal system, aeration and limit oxygen system;
Reactor body is concentric cylindrical, and inner ring is aerobic reactor zone, and outer shroud is intermediate sedimentation district and autotrophic denitrification district, and the inner edge wall in outer shroud intermediate sedimentation district and autotrophic denitrification district is the outside wall of inner ring aerobic reactor zone;
Arrange porous support supporting plate in aerobic reactor zone, it fills organic biofilm carrier, and between aerobic reactor zone and intermediate sedimentation district, top arranges the first effluent weir, and bottom arranges backflow seam; Arrange flow apron between intermediate sedimentation district and autotrophic denitrification district, top arranges the second effluent weir; Porous support supporting plate is set in autotrophic denitrification district, it fills light electrolysis carrier;
Water inlet system comprises intake pump, suction culvert, inlet valve and water distribution system; Intake pump, inlet valve are arranged at outside reactor body, and are connected to water distribution system by suction culvert; Water distribution system is arranged at bottom the aerobic reactor zone in reactor body, is positioned on the aeration head of aerobic zone, under porous support supporting plate;
Outlet system comprises final outflow water weir and outlet pipeline; Final outflow water weir is arranged at the water exit end top, autotrophic denitrification district of reactor body, and is connected with the outlet pipeline be arranged at outside reactor body;
Mud removal system comprises sludge funnel, spoil disposal valve and mud line; Sludge funnel is arranged at bottom the intermediate sedimentation district of reactor body, in inverted trapezoidal, and is connected with the mud line be arranged at outside reactor body by spoil disposal valve;
Aeration and limit oxygen system comprise aerobic reactor zone aerating system, autotrophic denitrification district conversion zone limit oxygen system and autotrophic denitrification district water exit end aerating system; Aerobic reactor zone aerating system comprises aerobic zone aeration head, aerobic zone aerating pipelines, aerobic zone aeration valve and aerobic zone air compressor; Aerobic zone aeration head is arranged at bottom aerobic reactor zone, is positioned under water distribution system, is connected with aerobic zone aeration valve by aerobic zone aerating pipelines with the aerobic zone air compressor be positioned at outside reactor body; Autotrophic denitrification district conversion zone limit oxygen system comprises micro-aeration head, limit oxygen section aerating pipelines, adjustable gate, limit oxygen section air compressor, dissolved oxygen monitoring probe and aeration automatic control device;
Micro-aeration head is arranged at bottom autotrophic denitrification district conversion zone, is positioned under porous support supporting plate, is connected with adjustable gate by limit oxygen section aerating pipelines with the limit oxygen section air compressor be positioned at outside reactor body;
Aeration automatic control device and the dissolved oxygen monitoring probe being positioned at autotrophic denitrification district with limit oxygen section air compressor and be connected, autotrophic denitrification district water exit end aerating system comprises water exit end aeration head, water exit end aerating pipelines, water exit end aeration valve and water exit end air compressor; Water exit end aeration head is arranged at bottom autotrophic denitrification district water exit end, is positioned under porous support supporting plate, is connected with water exit end aeration valve by water exit end aerating pipelines with the water exit end air compressor be positioned at outside reactor body.
2. the novel denitrogenation reactor of the integration based on autotrophic denitrification according to claim 1, is characterized in that the aspect ratio of inner ring aerobic reactor zone can be 1:0.5 ~ 1:10.
3. the novel denitrogenation reactor of the integration based on autotrophic denitrification according to claim 1, it is characterized in that the inner edge wall in outer shroud intermediate sedimentation district and autotrophic denitrification district is the outside wall of inner ring aerobic reactor zone, aspect ratio inner ring aerobic reactor zone is high, and external diameter can be 1.5 ~ 5 times of inner ring aerobic reactor zone diameter.
4. the novel denitrogenation reactor of the integration based on autotrophic denitrification according to claim 1, is characterized in that the volumetric ratio in intermediate sedimentation district and autotrophic denitrification district can be 1:10 ~ 1:3.
5. the novel denitrogenation reactor of the integration based on autotrophic denitrification according to claim 1, is characterized in that, by regulating limit oxygen section air compressor aeration pressure and flow, in the conversion zone in control autotrophic denitrification district, dissolved oxygen is lower than 3mg/L.
6. the novel denitrogenation reactor of the integration based on autotrophic denitrification according to claim 1, it is characterized in that autotrophic denitrification divides into autotrophic denitrification district conversion zone and autotrophic denitrification district water exit end, volumetric ratio can be 10:1 ~ 5:1.
7., based on the novel denitrification reaction processing method of integration of autotrophic denitrification, it is characterized in that comprising the following steps;
Sewage successively enters aerobic reactor zone, intermediate sedimentation district and autotrophic denitrification district by water inlet system, first the oxidising process of organism, ammonia nitrogen and nitrite is realized, and then realize the conversion process that the precipitation of aerobic sludge, reflux course and nitrate reduction generate nitrogen, finally discharged by outlet system;
Organic biofilm carrier is filled with suspension form in aerobic reactor zone, inoculated by active sludge and cultivate biofilm, on organic-biological membrane carrier, enrichment has oxidation operation, the heterotrophism aerobic microbiological of ammonia oxidation and nitrite-oxidizing function, the microorganism such as ammonia oxidation bacteria and NOB, utilize microbial process to be carbonic acid gas by the organic substance decomposing in water inlet, and be nitrate by ammonium oxidation;
Intermediate sedimentation district arranges water conservancy diversion plate washer and backflow seam, utilizes flow apron to reduce flow rate of water flow and aerobic reactor zone is generated and the surplus mud flowed out precipitation and discharge, utilize backflow seam by settling region to aerobic reactor zone returned sluge;
Light electrolysis carrier is filled with fixed bed form in autotrophic denitrification reaction zone, inoculated by active sludge and cultivate biofilm, enrichment autotrophic denitrification bacterium on light electrolysis carrier, the micro-electrolysis reaction of carrier is utilized to produce electron transmission, for the denitrification process of autotrophic denitrification bacterium provides electronics, reduction nitrate, to nitrogen, realizes the thorough removal of nitrogen pollutant in water;
Organic-biological membrane carrier in aerobic reactor zone can be made porous by macromolecule organic materials such as polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP) and material modified, urethane (PU) thereof and be easy to the various shape such as spherical, block of biofilm;
Arrange aerating system in aerobic reactor zone, the microorganism for enrichment on organic-biological membrane carrier provides sufficient oxygen; Water outlet dividing plate is set in aerobic reactor zone, to retain organic-biological membrane carrier;
Light electrolysis carrier in autotrophic denitrification district is fired and is shaped into the shapes such as spherical, block after can being mixed by iron powder and carbon dust; On light electrolysis carrier in autotrophic denitrification district, except autotrophic denitrification bacterium, also can enrichment heterotrophic denitrifying Bacteria, heterotrophism aerobic bacteria, other kind of quasi-microorganism such as ammonia oxidation bacteria and NOB, act synergistically with autotrophic denitrification bacterium and realize the common removal of nitrogen pollutant and organic pollutant.
8. the novel denitrification reaction processing method of the integration based on autotrophic denitrification according to claim 7, is characterized in that comprising the following steps; Autotrophic denitrification reaction zone comprises conversion zone and water exit end; Limit oxygen system is set in the conversion zone of autotrophic denitrification reaction zone, for the microorganism of enrichment on light electrolysis carrier provides limited oxygen condition; Limit oxygen system monitors dissolved oxygen concentration by dissolved oxygen probe, when dissolved oxygen concentration is too high, regulates aeration rate by automatic control system, to ensure that the dissolved oxygen concentration of autotrophic denitrification conversion zone is at below 3mg/L; In the water exit end of autotrophic denitrification reaction zone, aerating system is set, removes residual ammonia nitrogen and organism further.
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