A kind of integral type multistage simultaneous nitrification-denitrification biofilm system denitrogenation method and device
The invention belongs to technical field of biological sewage treatment, particularly relate to a kind of integral type multistage simultaneous nitrification-denitrification biofilm system denitrogenation method and device.
China's people in the countryside are numerous, and sanitary sewage quantity discharged is large, and major part is all directly discharged in water body without effectively processing, and result in serious water environment pollution problem.Market town, village, rural area disperses, and is concentrated by sewage to be transported to sewage work and to carry out process and there is certain difficulty; And the Sewage treatment systems floor space such as land treatment technique, bio-ecological combination technology obtaining extensive concern at present is at home large, large by the environmental influence such as season, region, treatment effect is unstable.Therefore high-level efficiency, Low investment, low operating cost, the simple sewage disposal technology of Operation and Maintenance meet treatment method for rural sewage and device assistant officer is to be developed.
Integral type sewage treatment facility, as the effective means of rural sewage treatment, has the features such as occupation of land is little, instant effect, convenient operation and management.Aerobic moving bed biofilm system MBBR is a kind of high-efficiency sewage treatment technology, this system is active sludge and the biomembranous system that coexists, biomass is large, has the advantage that denitrification effect is good, energy consumption is low, do not block, do not need back flushing, but shortcoming is filler easily runs off; Purification tank has efficient organics removal and nutritive salt, easy for installation, simple operation and other advantages, and its main technique is anaerobic filter bed and catalytic oxidation, and anaerobic filter bed easily blocks in actual moving process, needs to carry out regular back flushing, complicated operation; And existing AAO and AO bio-contact oxidation denitrification integrated device by nitrification and denitrification two independently process realize, carried out in two different reactors by nitrifier and denitrifying bacteria respectively, this technique Nitrogen/Phosphorus Removal is good, stable, but this technique need arrange independent whipping appts; In addition purification tank, AAO and AO bio-contact oxidation denitrification integrated device all need to arrange nitrification liquid backflow and sludge reflux power set, increase operational and administrative expenses, on practical application is promoted, there is certain difficulty.
The multistage simultaneous nitrification-denitrification of the present invention (abbreviation SND) denitrification integrated device, just on existing integrated apparatus Problems existing, gives full play to the advantage of simultaneous nitrification-denitrification and a kind of novel treatment process developed.First this each reactive tank in technique simultaneous nitrification-denitrification district is built-in biologic packing material, by controlling run condition, makes nitrification and denitrification process be achieved in same reaction zone, without the need to adding extra basicity; Secondly, the design of multistage pulling flow type makes each reactive tank form different load and environment, enhances the capacity of resisting impact load of system; Segmental influent enhances system denitrification simultaneously, makes carbon source obtain efficiency utilization.This device total hrt is shorter, and sludge yield is low, without the need to back flushing, stirring and sludge reflux equipment, economical and practical, is a kind of efficient apparatus of process domestic sewage in rural areas.
Summary of the invention
The object of the present invention is to provide a kind of novel integrated device, in rural domestic sewage treatment process, running maintenance complexity, energy consumption is large problem is there is for existing integrated device, giving a set of novel process and new approaches, is a kind of apparatus and method of removal of carbon and nitrogen of economical and efficient.
Multistage simultaneous nitrification-denitrification biofilm system integration denitrification method and device, is characterized in that: build based on regulatory region A, multistage simultaneous nitrification-denitrification district B, guiding region C and settling region D integration coupling.The dividing plate that described regulatory region A and multistage simultaneous nitrification-denitrification district B is provided with aperture by top separates; Multistage simultaneous nitrification-denitrification district B is connected with settling region D by guiding region C; Multistage simultaneous nitrification-denitrification district is divided into 3 grooves, and each groove is provided with out head piece by top, the baffle plate of lower return mouth separates, and each groove is equipped with biologic packing material 9, segmental influent pipe and aerating apparatus; Guiding region C is communicated with bottom settling region D.
The method of the multistage simultaneous nitrification-denitrification denitrogenation of integral type, mainly comprises the following steps:
(1) pending waste water enters in multistage simultaneous nitrification-denitrification denitrification reactor (4) regulatory region A with flow Q=33.3 ~ 66.7L/h;
(2) first A waste water in regulatory region enter into multistage simultaneous nitrification-denitrification district B
1in reactive tank, this reactive tank dissolved oxygen DO is 1.5 ~ 3.0mg/L, and the ammonia oxidizing bacteria (AOB bacterium) of suspended sludge and the upper biofilm surface of filler (9) is by NH
4 +be oxidized to NO
2 -, NOB (NOB bacterium) is by NO
2 -be further oxidized to NO
3; In the inner and suspension of microbial film under the inner anoxia condition of mud flco denitrifying bacterium with NO
3 -for electron acceptor(EA), COD is the part denitrification denitrogenation that electron donor carries out, and in biofilm surface and suspension, aerobic anti-nitre has metabolism to COD equally in addition, and this stage mainly completes the nitrated of ammonia nitrogen and part denitrification;
(3) through B
1mixed solution after reactive tank process enters B under hydro-flow thrust effect
2reactive tank, enters B simultaneously
2the former water flowed into through segmental influent pipe (1) in addition of reactive tank, this reactive tank water inlet DO controls at 1.0 ~ 2.0mg/L, former water and from B
1the nitrification liquid that reactive tank flows into carries out nitrated and denitrification fully at this groove,
(4) through B
2the former water that mixed solution after reactive tank process and segmental influent pipe (1) enter enters B simultaneously
3reactive tank carries out final nitrated and denitrification, and this reactive tank DO controls at 0.5 ~ 1.5mg/L; The total hrt in multistage simultaneous nitrification-denitrification district is 6.0 ~ 12.0h;
(5) multistage simultaneous nitrification-denitrification district B
3mixed solution after reactive tank process enters settling region D through guiding region C;
(6) mixed solution carries out mud-water separation at settling region D, and sedimentation time is 1.5 ~ 3.0h, and supernatant liquor is discharged through overflow port, and the active sludge of sinking slides to refluxing opening place bottom guiding region, at B through swash plate
3multistage simultaneous nitrification-denitrification district is back under the mixing wastewater with air stream effect that reactive tank aeration produces, by conditioning of mud backflow adjustable baffle altitude mixture control sludge reflux mouth (11) size, finally, mechanical dredge mode is utilized regularly to get rid of excess sludge in settling tank.
(7) in the segmental influent stage: under the suction function of intake pump, in regulatory region (A), waste water enters simultaneous nitrification-denitrification district B through segmental influent pipe (1)
3reaction tank bottom, is controlled the flooding velocity of each reactive tank, controls different influent flow rate distribution ratio by variable valve (3), B
3distribution ratio of liquid flow corresponding is respectively Q
3=3:2:1 and 3:(3 ?4): 3.The denitrification denitrogenation efficiency of this stage mainly lifting system.
The adjustment of sludge reflux mouth (11) size in the present invention, and the layout of filler, and the adjustment of different influent flow rate distribution ratio, as long as be require to correspond to different water inlets but meeting water outlet.
The present invention compares with existing integrated apparatus, and the design of this reaction unit has the following advantages:
(1) integral type multistage simultaneous nitrification-denitrification biomembrane denitrogenation device, operational administrative is easy, hygienic environment-protecting;
(2) the reasonable lattice in multistage simultaneous nitrification-denitrification district, creates the plug-flow state in reaction zone, improves speed of reaction, increases capacity of resisting impact load;
(3) the present invention makes nitrification and denitrification carry out in same reactor, without the need to additional carbon and basicity, without the need to stir and nitrated night refluxing unit, saving resource;
(4) the present invention is owing to arranging refluxing opening at each the lower partition in B district, utilizes aeration effect can realize the backflow of mud, without the need to arranging sludge recirculation system separately, saving equipment manufacturing cost and running processing cost;
(5) in multistage simultaneous nitrification-denitrification district owing to arranging hydrophilic biologic packing material, biomass is many, and processing efficiency is high, without the need to back flushing, by conservative control each aerated reaction groove DO concentration, can optimization system denitrification effect, treatment effect is stablized, energy-saving and cost-reducing;
(6) multi-section water-inlet arranges the loss of COD in minimizing system, the carbon source participating in denitrification denitrogenation is fully used, improves denitrification usefulness;
(7) high-biomass in device shortens hydraulic detention time, and sludge yield is low, saves capital cost and running cost;
(8) integration builds, and operational management is convenient, is beneficial to the promotion and application of Practical Project.
Accompanying drawing explanation
Fig. 1 is a kind of integral type provided by the invention multistage simultaneous nitrification-denitrification biofilm system nitrogen rejection facility schematic diagram.
In figure: 1-segmental influent pipe; 2-intake pump; 3-variable valve; The multistage simultaneous nitrification-denitrification denitrification reactor of 4-; 5-air pump; 6-gas meter; 7-pneumatic tube; 8-aeration head; 9-filler; 10-goes out head piece; 11-refluxing opening; 12-sludge reflux adjustable baffle; 13-inclined-plate clarifying basin; A-regulatory region; The multistage simultaneous nitrification-denitrification district of B-; C-guiding region; D-settling region.
Below in conjunction with drawings and Examples, the application is further described.
Device is shown in Fig. 1, a kind of integral type provided by the present invention multistage simultaneous nitrification-denitrification biofilm system nitrogen rejection facility, this system primarily of segmental influent pipe 1, intake pump 2, variable valve 3, multistage simultaneous nitrification-denitrification denitrification reactor 4, air pump 5, gas meter 6, pneumatic tube 7, aeration head 8, filler 9, go out head piece 10, refluxing opening 11, sludge reflux adjustable baffle 12, inclined-plate clarifying basin 13, wherein multistage simultaneous nitrification-denitrification denitrification reactor 4 is formed by regulatory region A, multistage simultaneous nitrification-denitrification district B, guiding region C, settling region D coupling structure from left to right successively, segmental influent pipe 1 is arranged on bottom equalizing tank, multistage simultaneous nitrification-denitrification district forms plural serial stage structure by 3 reactive tanks, adjacent two reactive tanks adopt and are provided with top and are provided with out head piece 10 bottom and are provided with the dividing plate of refluxing opening 11 separately, wherein refluxing opening size regulates by adjustable mobile baffle plate 12, the ratio of the volume of each reactive tank is 1:1:1, aeration head 8 is equipped with in each reactive tank, filler 9, wherein the filling ratio of filler be 35 ?50%, the mode of decrescence aeration is adopted to run, three groove dissolved oxygen concentrations control respectively at 1.5 ~ 3.0mg/L, 1.0 ~ 2.0mg/L, 0.5 ~ 1.5mg/L, total hrt is 6.0 ~ 12.0h, sludge reflux open height is H
2=10cm and H
3=15cm, segmental influent distribution ratio of liquid flow is Q
3=3:2:1 and 3:(3 ?4): 3, segmental influent pipe 1 is connected respectively with intake pump 2, variable valve 3, air pump 5, gas meter 6, pneumatic tube 7, aeration head 8 are connected successively, swash plate 14, overflow port 15 are all arranged at settling region D, and swash plate 14 and horizontal sextant angle are 45 ° ~ 60 °.
Utilize this device to realize the object of simultaneous nitrification-denitrification denitrogenation, detailed process is as follows:
Step one: the start-up in multistage simultaneous nitrification-denitrification district.
First to biological swimming filler inoculation of activated-sludge, mud takes from the returned sluge of sewage work, seed sludge MLSS is 3000mg/L, the initial MLSS of multistage simultaneous nitrification-denitrification district seed sludge is 600mg/L, the mode that after inoculation, reactor adopts " supplementary former water-vexed 18h of exposing to the sun-quiet heavy 4h-get rid of supernatant liquor-supplementary former water fast ", after repeating 4 circulations, carry out continuum micromeehanics, with dynamic natural culture method biofilm.And strengthen influent load gradually until design discharge according to treatment effect, as COD clearance >80%, NH
4 +?N clearance >85%, mark Biofilm Colonization substantially complete.
Step 2: the commencement of commercial operation of the multistage simultaneous nitrification-denitrification device of integral type.
After biofilm success, reactor enters the commencement of commercial operation stage.Enter waste water in regulatory region under water pump effect, enter in each reactive tank of multistage simultaneous nitrification-denitrification district B with flow Q=33.3 ~ 66.7L/h through segmental influent pipe, wherein B
1mixed solution in reactive tank, under hydro-flow thrust effect, enters B successively
3reactive tank, through B
3mixed solution after reactive tank finally processes enters settling region through guiding region; Mixed solution carries out mud-water separation at settling region D, and supernatant liquor is discharged through overflow port, and the active sludge of sinking slides to refluxing opening place bottom guiding region, at B through swash plate
3multistage simultaneous nitrification-denitrification district is back under the mixing wastewater with air stream effect that reactive tank aeration produces.
Former water takes from teaching and administrative staff biotope, Beijing University of Technology West septic tank supernatant liquor, and its water quality characteristics sees the following form:
Test conditions: intake pump controls flooding velocity Q=50L/h, the total HRT=8h of multistage simultaneous nitrification-denitrification Qu, three groups of gas meter control B respectively
1reactive tank DO
1=1.5 ~ 3.0mg/L, B
2reactive tank DO
2=1.0 ~ 2.0mg/L, B
3reactive tank DO
3=0.5 ~ 1.5mg/L, sedimentation time be 2h, MLSS between 2800 ~ 5000mg/L, each experimental stage treatment effect is as follows: (note: bracket in be mean value)
As seen from the above table: each experimental stage water outlet COD<50mg/L is 15cm at sludge reflux open height, flooding velocity ratio is under 3:4:3 and 1:1:1, NH
4 +-N<5mg/L, all reaches one-level A standard; This technique subsection water-feeding is arranged, and under water inlet carbon-nitrogen ratio is on average only the condition of 3.5, still achieves higher TN clearance, improves the utilization of carbon source rate of system.
Be more than wherein five embodiments of the present invention, enforcement of the present invention is not limited thereto.