CN105254008A - Circulation flow ring-shaped multi-section soil film symbiotic combined type bio-reactor and sewage treatment process thereof - Google Patents
Circulation flow ring-shaped multi-section soil film symbiotic combined type bio-reactor and sewage treatment process thereof Download PDFInfo
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Abstract
The invention relates to a circulation flow ring-shaped multi-section soil film symbiotic combined type bio-reactor and a sewage treatment process thereof. The reactor comprises an anaerobic zone, two or more stages of aerobic-anoxic matching zones and a settling zone. Each aerobic-anoxic matching zone comprises an anoxic zone and an aerobic zone which are sequentially established. A suspended filler zone is arranged in each aerobic zone. A sewage injection opening and a sludge injection opening are formed in the anaerobic zone. A sewage injection opening is formed in each anoxic zone. A sewage outflow opening and a sludge discharge opening are formed in the settling zone, and the sludge discharge opening is connected with the sewage injection opening of the anaerobic zone through a returned sludge pipeline. By the adoption of the circulation flow ring-shaped multi-section soil film symbiotic combined type bio-reactor sewage treatment process, through optional combination of the reactor, efficient nitrogen and phosphorus removal, tank volume control, floor space decrease, construction cost reduction and operating cost reduction can be effectively achieved.
Description
Technical field
The present invention relates to a kind of circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor and sewage treatment process thereof, belong to sewage treatment area.
Background technology
" the water prevention and cure of pollution action plan " of in April, 2015 up-to-date issue clearly proposes, and existing urban wastewater treatment facility will suit measures to local conditions to transform, and reaches corresponding emission standard or regeneration requirement before at the bottom of the year two thousand twenty.Sensitizing range (emphasis lake, emphasis reservoir, immediate offshore area watershed) urban wastewater treatment facility should reach one-level emission standard A before the end of the year 2017 comprehensively, Builtup areas water quality does not reach the city of surface water IV class standard, and newly-merged university sewage treatment facility will perform one-level emission standard A; To the year two thousand thirty, strive that National Water Environmental quality is totally improved, aquatic ecosystem function is tentatively recovered.To the middle of this century, eco-environmental quality is improved comprehensively, and the ecosystem realizes benign cycle.It can thus be appreciated that coming few decades energy-saving reduction of discharging requires can be more and more higher.
On the one hand, be still the present situation according to pollutant emission standard one-level B standard design and working for current numerous sewage work, along with deeply carrying out of national energy-saving emission reduction work, upgrading and the optimizing operation of sewage work are imperative.In sewage disposal upgrading, expand pond perhaps to increase advanced treatment unit be the most conventional is also the most reliable scheme, but a lot of sewage work does not have the sufficient newly-built sewage treatment unit in factory site, and the strict Arable-land Protection Policies of China does not allow again the random enlarged-area of sewage work, therefore little in the urgent need to seeking a floor space, the upgrading scheme that processing power is high, currently mainly contain BAF, contact oxidation method, membrane bioreactor, but it is high also to there is investment in these techniques, the problems such as energy consumption and running cost height, therefore, it is very necessary that mark upgrading technology is put forward in the sewage disposal of research and development efficient low-consume low cost.
On the other hand, the fast development in city makes originally progressively to be incorporated to urban district away from the sewage work in urban district, and the technology of the pond appearance that can utilize land limited in transformation or newly-built process, therefore seek a kind of reduced investment, can effectively control is day by day urgent.
This technology be intended to key breakthrough transformation or newly-built sewage work carry mark renovation technique, complete waste water stably reaching standard discharge.
Biological reaction tank is designed to anaerobic zone, front end/aerobic+multi-stage anaerobic/aerobic zone by multistage AO: multistage AO technique, adopt multiple spot water distribution technology, multistage is divided by sewage to allocate the front end of anaerobic zone and each oxygen-starved area respectively into, and returned sluge is all back to front end, anaerobic zone, create the environment being more suitable for polyP bacteria, nitrifier and denitrifying bacteria growth and breeding, greatly strengthen dephosphorization denitrogenation ability.
IFAS:IFAS technique is a kind of technique (principle is as shown below) be combined with the activated sludge process of suspension growth by the biomembrance process of apposition growth, specifically be and drop into floating stuffing in activated sludge process, the pollutent in water is jointly removed by the active sludge of the microbial film on floating stuffing and suspension, and because floating stuffing is to the cutting action of bubble, water oxygen transfer efficiency can be improved, enhancement process effect.
In addition, IFAS technique is by modes such as aeration disturbance, liquid returns, filler is suspended in the reactor, because the biomass be fixed on filler does not increase the mixed liquid concentration of active sludge, and biomembranous growth can reduce system SVI, therefore the performance of downstream settling tank not only can not be subject to the negative impact that in activated sludge reactor, solid loading increases, and its performance can be able to raising to a certain degree.
The present invention fully in conjunction with multistage AO and IFAS two kinds of process advantages (IFAS floor space is little, improve active sludge intermixture concentration, mud decrement and sludge settling property can be improved, do not increase second pond load, the advantage such as surge capability is strong and multistage AO sludge concentration is high, utilization of carbon source is abundant, nitric efficiency is high, capacity of resisting impact load is strong, working cost is few, construction investment is low), biochemical treatment is carried out to the sewage of sewage work, to reach preferably effluent quality.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, a kind of circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor and sewage treatment process thereof are provided, utilize described circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process by the optimum combination of reactor, effectively can realize high-efficient denitrification and dephosphorization, control pond appearance, reduce floor space, reduce construction costs and reduce working cost.
The present invention is achieved by the following technical solutions:
First aspect present invention provides a kind of circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor, is selected from the arbitrary of following reactor:
Reactor one: comprise the anaerobic zone of setting up successively, the supporting district of the above Anoxic/Aerobic of two-stage, settling region, the supporting district of described Anoxic/Aerobic comprises the oxygen-starved area and aerobic zone of setting up successively, partition wall is provided with between adjacent twoth district, one end of described partition wall is provided with water hole, floating stuffing district is provided with in described aerobic zone, described anaerobic zone is provided with sewage inlet and mud inlet, described oxygen-starved area is provided with sewage inlet, described settling region is provided with sewage outfall and sludge outlet, described sludge outlet connects the mud inlet of described anaerobic zone by returned sluge channel,
Reactor two: comprise the anaerobic zone and the supporting district of the above Anoxic/Aerobic of two-stage of setting up successively, the supporting district of described Anoxic/Aerobic comprises the oxygen-starved area and aerobic zone of setting up successively, partition wall is provided with between adjacent twoth district, one end of described partition wall is provided with water hole, floating stuffing district is provided with in described aerobic zone, described anaerobic zone and last step aerobic zone are closed and to be connected and the internal space formed is settling region, described settling region and described last step aerobic zone contact surface are provided with water hole, described anaerobic zone is provided with sewage inlet and mud inlet, described oxygen-starved area is provided with sewage inlet, described settling region is provided with sewage outfall and sludge outlet, described sludge outlet connects the mud inlet of described anaerobic zone by returned sluge channel.
Preferably, in described reactor two, described anaerobic zone and last step aerobic zone are closed and are connected and form annulus, and the internal space of described annulus is settling region.
Preferably, described anaerobic zone is provided with water conservancy diversion partition wall, by described water conservancy diversion partition wall, anaerobic zone is divided into anaerobic zone A and anaerobic zone B; The two ends of described water conservancy diversion partition wall are provided with two pod apertures.
Preferably, described oxygen-starved area is provided with water conservancy diversion partition wall, by described water conservancy diversion partition wall, described oxygen-starved area is divided into oxygen-starved area A and oxygen-starved area B; The two ends of described water conservancy diversion partition wall are provided with two pod apertures.
Preferably, described aerobic zone is provided with water conservancy diversion partition wall, by described water conservancy diversion partition wall, aerobic zone is divided into aerobic zone A and aerobic zone B; The two ends of described water conservancy diversion partition wall are provided with two pod apertures.
Preferably, described floating stuffing district comprises floating stuffing and floating stuffing device for trapping.
Preferably, described anaerobic zone and described oxygen-starved area are provided with submersible agitator.Preferred, the submersible agitator of anaerobic zone is stirring-type; The submersible agitator of oxygen-starved area is push flowing.
Preferably, described aerobic zone is provided with submersible agitator, and depending on aeration intensity, low or mixing sludge, filler fluidized state are arranged time poor.More excellent, the submersible agitator of aerobic zone is push flowing.
Preferably, described oxygen-starved area and described aerobic zone are provided with aerating system.Preferred, the aerating system of described oxygen-starved area and aerobic zone is made up of plate-type aerator, diameter D260 (200 ~ 300), and single maximal breathing capacity is 4m
3/ h (2.3 ~ 5.9); Described aerator comprises support, material ABS, subsidiary bilateral buckle.
Second aspect present invention provides a kind of circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process, for carrying out sewage disposal by above-mentioned circulation flow ring-shaped membrane bioreactor; Described sewage treatment process comprises the following steps:
(A) sewage enters described reactor by two portions, and first part enters anaerobic zone by the sewage inlet of anaerobic zone, and second section enters oxygen-starved area at different levels respectively by the sewage inlet of oxygen-starved area at different levels;
(B) from the sewage of the sewage inlet of anaerobic zone with mix from the returned sluge of settling region, in anaerobic zone, polyP bacteria releases phosphorus under anaerobic environment, transforms the organic pollutant of easily degraded simultaneously, and part itrogenous organic substance is carried out ammonification;
(C) then enter the supporting district of the above Anoxic/Aerobic of two-stage, carry out denitrification denitrogenation in oxygen-starved area at different levels, partial organic substances is degraded removal under the effect of denitrifying bacteria; Be provided with floating stuffing district in aerobic zone at different levels, carry out the absorption of the nitrated and phosphorus of the ammonification of organic further degraded and organonitrogen;
(D) water outlet of last step aerobic zone drains into settling region, and to be purified waste water discharge by mud-water separation, a thickened sludge part is back to anaerobic zone, and another part drains into sludge concentration and dewatering system.
Preferably, described anaerobic zone comprises anaerobic zone A and anaerobic zone B; First sewage enter anaerobic zone A, and the stirring pushing effect current downflow of the submersible agitator arranged in the A of anaerobic zone, then enters in the B of anaerobic zone, the stirring pushing effect current downflow of the submersible agitator arranged in the B of anaerobic zone; Then a part is circulated in the A of anaerobic zone, and a part enters first step oxygen-starved area.
Preferably, oxygen-starved area at different levels comprises oxygen-starved area A and oxygen-starved area B; The stirring pushing effect current downflow of the submersible agitator that sewage is arranged in the A of oxygen-starved area, then oxygen-starved area B is entered, the stirring pushing effect current downflow of the submersible agitator arranged in the B of oxygen-starved area, then a part is circulated in the A of oxygen-starved area, and a part enters aerobic zone.
Preferably, aerobic zone at different levels comprises aerobic zone A and aerobic zone B; Aerobic zone A and aerobic zone B is provided with floating stuffing district; First sewage enter aerobic zone A, then enters aerobic zone B, and a part is circulated in the A of aerobic zone, and a part enters oxygen-starved area or settling region.
Preferred, aerobic zone at different levels comprises aerobic zone A and aerobic zone B; Aerobic zone A and aerobic zone B is provided with floating stuffing district; First sewage enter aerobic zone A, the stirring pushing effect current downflow of the submersible agitator arranged in the A of aerobic zone, then aerobic zone B is entered, the stirring pushing effect current downflow of the submersible agitator arranged in the B of aerobic zone, then a part is circulated in the A of aerobic zone, and a part enters oxygen-starved area or settling region.
Sewage enters last step aerobic zone A, the stirring pushing effect current downflow of the submersible agitator in the end arranged in the A of one-level aerobic zone, then last step aerobic zone B is entered, the stirring pushing effect current downflow of the submersible agitator in the end arranged in the B of one-level aerobic zone, then a part is circulated in the A of last step aerobic zone, and a part enters settling region.
Preferably, the packing ratio in described floating stuffing district is 30 ~ 60%; Described floating stuffing is polyethylene, polypropylene or urethane, and particle diameter is 15mm ~ 100mm, and bulk specific gravity is 0.96 ± 2g/cm
3, specific surface area >500m
2/ m
3; Described floating stuffing device for trapping retains net by stainless steel porous and forms, and retains net Circularhole diameter 8mm ~ 20mm, and center of circular hole, apart from being 10mm ~ 50mm, retaining net both sides base portion and respectively installs the thick bubble diffuser of a row.
Preferably, a thickened sludge part is back to the return sludge ratio 50 ~ 100% of anaerobic zone; The mean sludge concentration 8000 ~ 14000mg/L of reaction zone.
Preferably, the stirring intensity of anaerobic zone is 4 ~ 5W/m
3, the stirring intensity of oxygen-starved area is 1 ~ 3W/m
3.
Preferably, described aerobic zone is provided with aerating system, and aerobic zone aeration intensity is 8 ~ 10m
3/ m
2.h, reserved 10 ~ 20% aerobic zone aerators in next stage oxygen-starved area of aerobic zone are wherein close to.
Preferably, described oxygen-starved area is provided with aerating system, and oxygen-starved area aeration intensity is 2 ~ 10m
3/ m
2.h.
Preferably, the hydraulic detention time of described anaerobic zone is 1 ~ 2h; The hydraulic detention time of described oxygen-starved area is 0.5 ~ 3h; The hydraulic detention time of described aerobic zone is 3.5 ~ 5h.
Preferably, the denitrification load values scope of described oxygen-starved area is 0.03 ~ 0.06kgNO
3-N/kgMLSS.d; Described sludge loading value is 0.05 ~ 0.15kgBOD
5/ (kgMLSS.d).
Circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor of the present invention and sewage treatment process thereof, have following beneficial effect:
(1) operation scheme is flexible, and denitrogenation dephosphorizing efficiency is high.Multipoint water feeding mode can make the multistage distribution of pollutent, and each reaction zone can form obvious sludge concentration gradient according to pollutent characteristic, and operation scheme is flexible; Created the environment of each quasi-microorganism suitable growth in suitable activity mud by the segmentation of reaction zone, realize high-efficient denitrification and dephosphorization; The next stage oxygen-starved area of next-door neighbour aerobic zone arranges air system, can be reduced into conventional A according to water quality
2o process operation;
(2) hydraulic flow state is in " section cyclic mixing, overall plug-flow ", and hybrid reaction is satisfactory for result.Each district reactor adopts the fluidised form of cycling stream, possesses the anti impulsion load ability of complete mix flow and the substrate degradation impellent of plug flow reactor simultaneously; Each district reactor adopts cycling stream mode, and water inlet water-flow equation is even, and not easily produce torrent, eddy current, short stream, stagnant water and deposition phenomenon in reactor, head loss is less, and the degree of mixing well of micromixing is high, hybrid reaction is satisfactory for result;
(3) strong shock resistance.First, by multipoint water feeding mode, properly distributed is carried out to source of pollution, ensure the sludge loading that each reaction zone is comparatively suitable for; Secondly, the microbial film on floating stuffing is aging to come off when entering mixed solution, can play inoculation effect, the capacity of resisting impact load of reaction tank is improved to active sludge; Finally, various hybrid mode is organically combined, also can improve the applicable ability of system process to different sewage water quality;
(4) sludge settling property strengthens, and excess sludge production reduces.Floating stuffing can effectively improve reaction tank sludge concentration, and the microbial biomass of raising, owing to being fixed on filling carrier, not only can not increasing the mixed liquid concentration of active sludge and the solid loading of downstream settling tank, and can reduce SVI, improves sludge settling property; Simultaneously because floating stuffing sludge concentration is high, mud mud increases age, and corresponding excess sludge production can reduce;
(5) construction investment is low.The biomass of floating stuffing layer makes pollutent biochemical treatment be able to complete in less space, and the pond significantly reducing reaction tank holds (about 45%), construction investment low (about 15%);
(6) operation energy consumption is low.First, utilize that multipoint water feeding, multi-stage anaerobic are aerobic carries out nitration denitrification, optimize carbon source is distributed and strengthened denitrification cancels conventional art simultaneously nitrification liquid and to reflux facility, operation energy consumption is minimized; Secondly, adopt micro-pore aeration equipment, power consumption is far below conventional perforation or mesopore aerating system, and in conjunction with cycling stream waterpower form, can solve the contradiction between oxygenation and stirring, be conducive to being recycled reaction tank end dissolved oxygen, capacity usage ratio is high; 3rd, in conjunction with plug-flow, biofloculation in reactor adopts lower impellent, can energy efficient;
(7) piping system is few, and Maintenance and Repair amount is little.By inner channel rhythmo structure design, eliminate into water, returned sluge pipeline system, Maintenance and Repair amount is little.
Accompanying drawing explanation
Fig. 1 is a kind of circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process figure;
Fig. 2 is a kind of square circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor plan structure schematic diagram;
Accompanying drawing illustrates:
1-anaerobic zone; 1a-anaerobic zone A; 1b-anaerobic zone B;
2-first step oxygen-starved area; 2a-first step oxygen-starved area A; 2b-first step oxygen-starved area B;
3-first step aerobic zone; 3a-first step aerobic zone A; 3b-first step aerobic zone B; (containing floating stuffing district);
Oxygen-starved area, the 4-second stage; 4a-second stage oxygen-starved area A; 4b-second stage oxygen-starved area B;
Aerobic zone, the 5-second stage; 5a-second stage aerobic zone A; 5b-second stage aerobic zone B; (containing floating stuffing district);
6-settling region; 6a-settling region sewage outfall; 6b-settling region mud outlet;
7-sewage inlet; 7a-anaerobic zone sewage inlet; 7b-first step oxygen-starved area sewage inlet; Oxygen-starved area, 7c-second stage sewage inlet;
8-returned sluge channel; The mud inlet of 8a-anaerobic zone;
Water conservancy diversion partition wall between 9-anaerobic zone A and anaerobic zone B; The division wall of 10-anaerobic zone and first step oxygen-starved area; Water conservancy diversion partition wall between 11-first step oxygen-starved area A and first step oxygen-starved area B; The division wall of 12-first step oxygen-starved area and first step aerobic zone; Water conservancy diversion partition wall between 13-first step aerobic zone A and first step aerobic zone B; The division wall of 14-first step aerobic zone and oxygen-starved area, the second stage; Water conservancy diversion partition wall between 15-second stage oxygen-starved area A and oxygen-starved area, second stage B; The division wall of oxygen-starved area, the 16-second stage and aerobic zone, the second stage; Water conservancy diversion partition wall between 17-second stage aerobic zone A and aerobic zone, second stage B; The division wall of aerobic zone, the 18-second stage and settling region;
The pod apertures of 19 & 20-anaerobic zones; 21-anaerobic zone is to the water hole of first step oxygen-starved area; The pod apertures of 22 & 23-first step oxygen-starved areas; The water hole of 24-first step oxygen-starved area to first step aerobic zone; The pod apertures of 25 & 26-first step aerobic zones; The water hole of 27-first step aerobic zone to oxygen-starved area, the second stage; The pod apertures of 28 oxygen-starved area, the & 29-second stage; The water hole of oxygen-starved area, the 30-second stage to aerobic zone, the second stage; The pod apertures of 31 aerobic zone, the & 32-second stage; The pod apertures of aerobic zone, the 33-second stage to settling region;
34-floating stuffing; 35-floating stuffing device for trapping; 36-diving mixer (underwater scooter);
Fig. 3 is a kind of round circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor plan structure schematic diagram.
Accompanying drawing illustrates:
1-anaerobic zone; 1a-anaerobic zone A; 1b-anaerobic zone B;
2-first step oxygen-starved area; 2a-first step oxygen-starved area A; 2b-first step oxygen-starved area B;
3-first step aerobic zone; 3a-first step aerobic zone A; 3b-first step aerobic zone B; (containing floating stuffing district);
Oxygen-starved area, the 4-second stage; 4a-second stage oxygen-starved area A; 4b-second stage oxygen-starved area B;
Aerobic zone, the 5-second stage; 5a-second stage aerobic zone A; 5b-second stage aerobic zone B; (containing floating stuffing district);
6-third stage oxygen-starved area; 6a-third stage oxygen-starved area A; 6b-third stage oxygen-starved area B;
7-third stage aerobic zone; 7a-third stage aerobic zone A; 7b-third stage aerobic zone B; (containing floating stuffing district);
8-settling region;
9-inlet channel; 9a-anaerobic zone sewage inlet; 9b-first step oxygen-starved area sewage inlet; Oxygen-starved area, 9c-second stage sewage inlet; 9d-third stage oxygen-starved area sewage inlet;
10-returned sluge channel;
The division wall of 11-third stage aerobic zone and anaerobic zone; Water conservancy diversion partition wall between 12-anaerobic zone A and anaerobic zone B; The division wall of 13-anaerobic zone and first step oxygen-starved area; Water conservancy diversion partition wall between 14-first step oxygen-starved area A and first step oxygen-starved area B; The division wall of 15-first step oxygen-starved area and first step aerobic zone; Water conservancy diversion partition wall between 16-first step aerobic zone A and first step aerobic zone B; The division wall of 17-first step aerobic zone and oxygen-starved area, the second stage; Water conservancy diversion partition wall between 18-second stage oxygen-starved area A and oxygen-starved area, second stage B; The division wall of oxygen-starved area, the 19-second stage and aerobic zone, the second stage; Water conservancy diversion partition wall between 20-second stage aerobic zone A and aerobic zone, second stage B; The division wall of aerobic zone, the 21-second stage and third stage oxygen-starved area; Water conservancy diversion partition wall between 22-third stage oxygen-starved area A and third stage oxygen-starved area B; The division wall of 23-third stage oxygen-starved area and third stage aerobic zone; Water conservancy diversion partition wall between 24-third stage aerobic zone A and third stage aerobic zone B;
The pod apertures of 25 & 26-anaerobic zones; 27-anaerobic zone is to the water hole of first step oxygen-starved area; The pod apertures of 28 & 29-first step oxygen-starved areas; The water hole of 30-first step oxygen-starved area to first step aerobic zone; The pod apertures of 31 & 32-first step aerobic zones; The water hole of 33-first step aerobic zone to oxygen-starved area, the second stage; The pod apertures of 34 oxygen-starved area, the & 35-second stage; The water hole of oxygen-starved area, the 36-second stage to aerobic zone, the second stage; The pod apertures of 37 aerobic zone, the & 38-second stage; The water hole of aerobic zone, the 39-second stage to third stage oxygen-starved area; The pod apertures of 40 & 41-third stage oxygen-starved areas; The water hole of 42-third stage oxygen-starved area to third stage aerobic zone; The pod apertures of 43 & 44-third stage aerobic zones;
45-floating stuffing device for trapping; 46-floating stuffing; 47-submersible agitator (underwater scooter);
The partition wall of 48-settling region and anaerobic zone, oxygen-starved area and aerobic zone;
49-settling region sewage inlet.
Embodiment
The schema of circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process of the present invention as shown in Figure 1, in conjunction with multistage AO and IFAS two kinds of process advantages, carries out biochemical treatment to the sewage of sewage work, to reach preferably effluent quality.
Below by way of specific specific examples, technical scheme of the present invention is described.Should be understood that one or more method stepss that the present invention mentions do not repel and before and after described combination step, also to there is additive method step or can also insert additive method step between these steps clearly mentioned; Should also be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.And, except as otherwise noted, the numbering of various method steps is only the convenient tool differentiating various method steps, but not be ordering or the enforceable scope of restriction the present invention of restriction various method steps, the change of its relativeness or adjustment, when changing technology contents without essence, when being also considered as the enforceable category of the present invention.
Below in conjunction with accompanying drawing and concrete case study on implementation, the invention will be further described.
Embodiment 1
As shown in Figure 2, a kind of circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor (CCMAO-IFAS) (square), comprise anaerobic zone 1, first step oxygen-starved area 2, first step aerobic zone 3, oxygen-starved area, the second stage 4, aerobic zone, the second stage 5 and settling region 6, anaerobic zone is provided with sewage inlet 7a and mud inlet 8a, first step oxygen-starved area 2 is provided with first step oxygen-starved area sewage inlet 7b, oxygen-starved area, the second stage 4 is provided with oxygen-starved area, second stage sewage inlet 7c, settling region 6 is provided with settling region sewage outfall 6a and settling region sludge outlet 6b, settling region sludge outlet 6b connects the mud inlet 8a of anaerobic zone by returned sluge channel 8, reactor is square, 7 inlet channels are arranged respectively influent weir and sewage is dispensed to anaerobic zone 1, first step oxygen-starved area 2 and oxygen-starved area, the second stage 4 by control gate, anaerobic zone 1 comprises anaerobic zone A1a and anaerobic zone B1b, anaerobic zone A1a and anaerobic zone B1b is separated by water conservancy diversion partition wall 9, the two ends of water conservancy diversion partition wall 9 are provided with pod apertures 19 & 20, current are then communicated with by pod apertures 19 & 20, and inside arranges submersible agitator 36 and stirs promotion, anaerobic zone 1 and first step oxygen-starved area 2 are separated by partition wall 10, and one end of partition wall 10 is provided with water hole 21, and anaerobic zone 1 sewage is communicated with first step oxygen-starved area 2 by water hole 21, first step oxygen-starved area 2 comprises first step oxygen-starved area A2a and first step oxygen-starved area B2b, first step oxygen-starved area A2a and first step oxygen-starved area B2b is separated by water conservancy diversion partition wall 11, the two ends of water conservancy diversion partition wall 11 are provided with pod apertures 22 & 23, current are then communicated with by pod apertures 22 & 23, and inside arranges submersible agitator 36 and stirs promotion and micro-pore aeration equipment, first step oxygen-starved area 2 and first step aerobic zone 3 are separated by partition wall 12, and one end of partition wall 12 is provided with water hole 24, and first step oxygen-starved area 2 is communicated with first step aerobic zone 3 by water hole 24, first step aerobic zone 3 comprises first step aerobic zone A3a and first step aerobic zone B3b, first step aerobic zone A3a and first step aerobic zone B3b is separated by water conservancy diversion partition wall 13, the two ends of water conservancy diversion partition wall 13 are provided with pod apertures 25 & 26, current are then communicated with by pod apertures 25 & 26, circulate around water conservancy diversion partition wall 13 simultaneously, be provided with floating stuffing district and micro-pore aeration equipment in first step aerobic zone 3, floating stuffing district comprises floating stuffing 34 and floating stuffing device for trapping 35, and floating stuffing 34 is fixed on designated area by floating stuffing device for trapping 35, first step aerobic zone 3 and oxygen-starved area, the second stage 4 are separated by partition wall 14, and one end of partition wall 14 is provided with water hole 27, and first step aerobic zone 3 sewage is communicated with oxygen-starved area, the second stage 4 by water hole 27, oxygen-starved area, the second stage 4 comprises oxygen-starved area, second stage A4a and oxygen-starved area, second stage B4b, oxygen-starved area, second stage A4a and oxygen-starved area, second stage B4b is separated by water conservancy diversion partition wall 15, the two ends of water conservancy diversion partition wall 15 are provided with pod apertures 28 & 29, current are then communicated with by pod apertures 28 & 29, and inside arranges submersible agitator 36 and stirs promotion and micro-pore aeration equipment, oxygen-starved area, the second stage 4 and aerobic zone, the second stage 5 are separated by partition wall 16, and one end of partition wall 16 is provided with water hole 30, and oxygen-starved area, the second stage 4 sewage is communicated with aerobic zone, the second stage 5 by water hole 30, aerobic zone, the second stage 5 comprises aerobic zone, second stage A5a and aerobic zone, second stage B5b, aerobic zone, second stage A5a and aerobic zone, second stage B5b is separated by water conservancy diversion partition wall 17, the two ends of water conservancy diversion partition wall 17 are provided with pod apertures 31 & 32, current are then communicated with by pod apertures 31 & 32, circulate around water conservancy diversion partition wall 17 simultaneously, be provided with floating stuffing district and micro-pore aeration equipment in aerobic zone, the second stage 5, floating stuffing district comprises floating stuffing 34 and floating stuffing device for trapping 35, and floating stuffing 34 is fixed on designated area by floating stuffing device for trapping 35, aerobic zone, the second stage 5 and settling region 6 are separated by partition wall 18, and one end of partition wall 18 is provided with water hole 33, and aerobic zone, the second stage 5 sewage is communicated with settling region 6 by water hole 33, settling region 6 thickened sludge is back to anaerobic zone 1,8 returned sluge channel by returned sluge channel 8 and arranges control gate.
The circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor (CCMAO-IFAS) (square) as Fig. 1 is adopted to process 40000m
3/ d town sewage, treatment process comprises the following steps:
(1) sewage enters reactor by two portions, first part enters anaerobic zone 1 by the sewage inlet 7a of anaerobic zone, and second section enters first step oxygen-starved area 2 and oxygen-starved area, the second stage 4 respectively by first step oxygen-starved area sewage inlet 7b and oxygen-starved area, second stage sewage inlet 7c in proportion; Enter first step oxygen-starved area and enter the discharge of oxygen-starved area, the second stage than being 2:3.
(2) from the sewage of anaerobic zone sewage inlet 7a with mix from the returned sluge of settling region, first anaerobic zone A1a is entered, the stirring pushing effect current downflow of the submersible agitator arranged in the A1a of anaerobic zone, then enter in the B of anaerobic zone, the stirring pushing effect current downflow of the submersible agitator arranged in the B of anaerobic zone; Then a part is circulated in the A of anaerobic zone, and a part enters polyP bacteria in anaerobic zone, first step oxygen-starved area and release phosphorus under anaerobic environment, transforms the organic pollutant of easily degraded simultaneously, and part itrogenous organic substance is carried out ammonification;
(3) then enter the supporting district of two-stage Anoxic/Aerobic, every grade of supporting district of Anoxic/Aerobic comprises oxygen-starved area and aerobic zone, and oxygen-starved area at different levels comprises oxygen-starved area A and oxygen-starved area B; The stirring pushing effect current downflow of the submersible agitator that sewage is arranged in the A of oxygen-starved area, then oxygen-starved area B is entered, the stirring pushing effect current downflow of the submersible agitator arranged in the B of oxygen-starved area, then a part is circulated in the A of oxygen-starved area, and a part enters aerobic zone.Aerobic zone at different levels comprises aerobic zone A and aerobic zone B; Aerobic zone A and/or aerobic zone B is provided with floating stuffing district; First sewage enter aerobic zone A, then enters aerobic zone B, and a part is circulated in the A of aerobic zone, and a part enters oxygen-starved area or settling region, carries out denitrification denitrogenation in oxygen-starved area at different levels, and partial organic substances is degraded removal under the effect of denitrifying bacteria; Be provided with floating stuffing district in aerobic zone at different levels, carry out the absorption of the nitrated and phosphorus of the ammonification of organic further degraded and organonitrogen;
(4) water outlet of last step aerobic zone drains into settling region, and to be purified waste water discharge by mud-water separation, a thickened sludge part is back to anaerobic zone, and another part drains into sludge concentration and dewatering system.
34 floating stuffing packing ratios are 35%; 14 floating stuffing materials are polyethylene, particle diameter 25mm, bulk specific gravity 0.96 ± 2g/cm
3, specific surface area >500m
2/ m
3; 35 floating stuffing device for trapping retain net by stainless steel porous and form, and retain net Circularhole diameter 8mm, and center of circular hole, apart from being 10mm, retaining net both sides base portion and respectively installs the thick bubble diffuser of a row.Anaerobic zone submersible agitator is stirring-type; Oxygen-starved area and aerobic zone submersible agitator are push flowing.Oxygen-starved area and aerobic zone aerating system are made up of plate-type aerator, diameter D250, and single maximal breathing capacity is 4m
3/ h; Aerator comprises support, material ABS, subsidiary bilateral buckle.
Reaction zone return sludge ratio 100% (actual motion 50 ~ 100%); Reaction zone mean sludge concentration 8360mg/L (actual 7000 ~ 12000mg/L); Anaerobic zone stirring intensity 5W/m
3, configure 4 stirrers, separate unit power 2.2kW; Oxygen-starved area stirring intensity 2.5W/m
3, configure 8 stirrers, separate unit power 1.1kW; Aerobic zone aeration intensity 8 ~ 10m
3/ m
2.h, arrange microporous aeration disc 2500, reserved 10 ~ 20% aerobic zone aerators in oxygen-starved area 2 (are reduced into conventional A
2this district of O state of the art is by aerobic operation).
Anaerobic zone hydraulic detention time is 1h; Oxygen-starved area hydraulic detention time is 2.3h; Aerobic zone hydraulic detention time is 3.8h.The denitrification load values scope of oxygen-starved area is 0.03kgNO
3-N/kgMLSS.d (actual motion 0.03 ~ 0.05kgNO
3-N/kgMLSS.d); Sludge loading value is 0.108kgBOD
5/ (kgMLSS.d) (actual motion 0.05 ~ 0.15kgBOD
5/ (kgMLSS.d)).
Structure of reactor size (except settling region): L × B × H=50 × 40 × 7m (available depth 6m) (totally 1, point two groups of operations).
Implementation result:
Design influent quality:
COD
Cr：330mg/L；BOD
5：150mg/L；TN：40mg/L；NH
3-N：35mg/L；SS：300mg/L；TP：5mg/L；
After sewage treatment process process of the present invention, main effluent quality all can reach to " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) one-level A below the mark.
Operation energy consumption: 0.19 ~ 0.21kW.h/m
3.
Embodiment 2
As shown in Figure 3, a kind of circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor (CCMAO-IFAS) (round), comprise anaerobic zone 1, first step oxygen-starved area 2, first step aerobic zone 3, oxygen-starved area, the second stage 4, aerobic zone, the second stage 5, third stage oxygen-starved area 6, third stage aerobic zone 7 and settling region 8, anaerobic zone is provided with sewage inlet 9a and mud inlet, first step oxygen-starved area 2 is provided with first step oxygen-starved area sewage inlet 9b, oxygen-starved area, the second stage 4 is provided with oxygen-starved area, second stage sewage inlet 9c, third stage oxygen-starved area 6 is provided with third stage oxygen-starved area sewage inlet 9d, settling region 8 is provided with settling region sewage outfall and settling region sludge outlet, settling region sludge outlet connects the mud inlet of anaerobic zone by returned sluge channel 10, reactor is round, inlet channel 9 is arranged respectively influent weir and sewage is dispensed to anaerobic zone 1, first step oxygen-starved area 2, oxygen-starved area, the second stage 4 and third stage oxygen-starved area 6 by control gate, anaerobic zone 1 comprises anaerobic zone A1a and anaerobic zone B1b, anaerobic zone A1a and anaerobic zone B1b is separated by water conservancy diversion partition wall 12, the two ends of water conservancy diversion partition wall 12 are provided with pod apertures 25 & 26, current are then communicated with by pod apertures 25 & 26, and inside arranges submersible agitator 47 and stirs promotion, anaerobic zone 1 and first step oxygen-starved area 2 are separated by partition wall 13, and one end of partition wall 13 is provided with water hole 27, and anaerobic zone 1 sewage is communicated with first step oxygen-starved area 2 by water hole 27, first step oxygen-starved area 2 comprises first step oxygen-starved area A2a and first step oxygen-starved area B2b, first step oxygen-starved area A2a and first step oxygen-starved area B2b is separated by water conservancy diversion partition wall 14, the two ends of water conservancy diversion partition wall 14 are provided with pod apertures 28 & 29, current are then communicated with by pod apertures 28 & 29, and inside arranges submersible agitator 47 and stirs promotion and micro-pore aeration equipment, first step oxygen-starved area 2 and first step aerobic zone 3 are separated by partition wall 15, and one end of partition wall 15 is provided with water hole 30, and first step oxygen-starved area 2 sewage is communicated with first step aerobic zone 3 by water hole 30, first step aerobic zone 3 comprises first step aerobic zone A3a and first step aerobic zone B3b, first step aerobic zone A3a and first step aerobic zone B3b is separated by water conservancy diversion partition wall 16, the two ends of water conservancy diversion partition wall 16 are provided with pod apertures 31 & 32, current are then communicated with by pod apertures 31 & 32, can circulate around water conservancy diversion partition wall 16 simultaneously, be provided with floating stuffing district and micro-pore aeration equipment in first step aerobic zone 3, floating stuffing district comprises floating stuffing 45 and floating stuffing device for trapping, and floating stuffing 45 leads to floating stuffing device for trapping 46 and is fixed on designated area, first step aerobic zone 3 and oxygen-starved area, the second stage 4 are separated by partition wall 17, and one end of partition wall 17 is provided with water hole 33, and first step aerobic zone 3 sewage is communicated with oxygen-starved area, the second stage 4 by water hole 33, oxygen-starved area, the second stage 4 comprises oxygen-starved area, second stage A4a and oxygen-starved area, second stage B4b, oxygen-starved area, second stage A4a and oxygen-starved area, second stage B4b is separated by water conservancy diversion partition wall 18, the two ends of water conservancy diversion partition wall 18 are provided with pod apertures 34 & 35, current are then communicated with by pod apertures 34 & 35, and inside arranges submersible agitator 47 and stirs promotion and micro-pore aeration equipment, oxygen-starved area, the second stage 4 and aerobic zone, the second stage 5 are separated by partition wall 19, and one end of partition wall 19 is provided with water hole 36, and oxygen-starved area, the second stage 4 sewage is communicated with aerobic zone, the second stage 5 by water hole 36, aerobic zone, the second stage 5 comprises aerobic zone, second stage A5a and aerobic zone, second stage B5b, aerobic zone, second stage A5a and aerobic zone, second stage B5b is separated by water conservancy diversion partition wall 20, the two ends of water conservancy diversion partition wall 20 are provided with pod apertures 37 & 38, current are then communicated with by pod apertures 37 & 38, circulate around water conservancy diversion partition wall 20 simultaneously, be provided with floating stuffing district and micro-pore aeration equipment in aerobic zone, the second stage 5, floating stuffing district comprises floating stuffing 45 and floating stuffing device for trapping, and floating stuffing 45 is fixed on designated area by floating stuffing device for trapping 46, aerobic zone, the second stage 5 and third stage oxygen-starved area 6 are separated by partition wall 21, and one end of partition wall 21 is provided with water hole 39, and aerobic zone, the second stage 5 sewage is communicated with third stage oxygen-starved area 6 by water hole 39, third stage oxygen-starved area 6 comprises third stage oxygen-starved area A6a and third stage oxygen-starved area B6b, third stage oxygen-starved area A6a and third stage oxygen-starved area B6b is separated by water conservancy diversion partition wall 22, the two ends of water conservancy diversion partition wall 22 are provided with pod apertures 40 & 41, current are then communicated with by pod apertures 40 & 41, and inside arranges submersible agitator 47 and stirs promotion and micro-pore aeration equipment, third stage oxygen-starved area 6 and third stage aerobic zone 7 are separated by partition wall 23, and one end of partition wall 23 is provided with water hole 42, and third stage oxygen-starved area 6 sewage is communicated with third stage aerobic zone 7 by water hole 42, third stage aerobic zone 7 comprises third stage aerobic zone A7a and third stage aerobic zone B7b, third stage aerobic zone A7a and third stage aerobic zone B7b is separated by water conservancy diversion partition wall 24, the two ends of water conservancy diversion partition wall 24 are provided with pod apertures 43 & 44, current are then communicated with by pod apertures 43 & 44, circulate around water conservancy diversion partition wall 24 simultaneously, be provided with floating stuffing district and micro-pore aeration equipment in third stage aerobic zone 7, floating stuffing district comprises floating stuffing 45 and floating stuffing device for trapping, and floating stuffing 45 is fixed on designated area by floating stuffing device for trapping 46, third stage aerobic zone 7 and anaerobic zone 1 are separated by partition wall 25, third stage aerobic zone 7 water outlet imports settling region 8 by settling region sewage inlet 49, and settling region 8 is separated by partition wall 48 and other subregions, settling region 8 thickened sludge is back to anaerobic zone 1 by returned sluge channel 10, and returned sluge channel 10 arranges control gate.
The circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor (CCMAO-IFAS) (square) as Fig. 2 is adopted to process 20000m
3/ d town sewage, treatment process comprises the following steps:
(1) sewage enters reactor by two portions, first part enters anaerobic zone 1 by the sewage inlet 9a of anaerobic zone, and second section enters first step oxygen-starved area 2, oxygen-starved area, the second stage 4 and third stage oxygen-starved area 6 respectively by first step oxygen-starved area sewage inlet 9b, oxygen-starved area, second stage sewage inlet 9c and third stage oxygen-starved area sewage inlet 9d in proportion; Enter first step oxygen-starved area, enter oxygen-starved area, the second stage, enter the discharge of third stage oxygen-starved area than for 3:3:4.
(2) from the sewage of anaerobic zone sewage inlet with mix from the returned sluge of settling region, first anaerobic zone A1a is entered, the stirring pushing effect current downflow of the submersible agitator arranged in the A1a of anaerobic zone, then enter in the B of anaerobic zone, the stirring pushing effect current downflow of the submersible agitator arranged in the B of anaerobic zone; Then a part is circulated in the A of anaerobic zone, and a part enters first step oxygen-starved area, and in anaerobic zone, polyP bacteria releases phosphorus under anaerobic environment, transforms the organic pollutant of easily degraded simultaneously, and part itrogenous organic substance is carried out ammonification;
(3) then enter three grades of supporting districts of Anoxic/Aerobic, every grade of supporting district of Anoxic/Aerobic comprises oxygen-starved area and aerobic zone, and oxygen-starved area at different levels comprises oxygen-starved area A and oxygen-starved area B; The stirring pushing effect current downflow of the submersible agitator that sewage is arranged in the A of oxygen-starved area, then oxygen-starved area B is entered, the stirring pushing effect current downflow of the submersible agitator arranged in the B of oxygen-starved area, then a part is circulated in the A of oxygen-starved area, and a part enters aerobic zone; Aerobic zone at different levels comprises aerobic zone A and aerobic zone B; A aerobic zone, aerobic zone B is provided with floating stuffing district; First sewage enter aerobic zone A, then enters aerobic zone B, and a part is circulated in the A of aerobic zone, and a part enters oxygen-starved area or settling region, carries out denitrification denitrogenation in oxygen-starved area at different levels, and partial organic substances is degraded removal under the effect of denitrifying bacteria; Be provided with floating stuffing district in aerobic zone at different levels, carry out the absorption of the nitrated and phosphorus of the ammonification of organic further degraded and organonitrogen;
(4) water outlet of last step aerobic zone drains into settling region, and to be purified waste water discharge by mud-water separation, a thickened sludge part is back to anaerobic zone, and another part drains into sludge concentration and dewatering system.
Floating stuffing 45 packing ratio is 30%; 14 floating stuffing materials are polyethylene, particle diameter 25mm, bulk specific gravity 0.96 ± 2g/cm
3, specific surface area >500m
2/ m
3; Floating stuffing device for trapping 46 retains net by stainless steel porous and forms, and retains net Circularhole diameter 8mm, and center of circular hole, apart from being 10mm, retaining net both sides base portion and respectively installs the thick bubble diffuser of a row.Anaerobic zone submersible agitator is stirring-type; Oxygen-starved area and aerobic zone submersible agitator are push flowing.Oxygen-starved area and aerobic zone aerating system are made up of plate-type aerator, diameter D250, and single maximal breathing capacity is 4m
3/ h; Aerator comprises support, material ABS, subsidiary bilateral buckle.
Reaction zone return sludge ratio 100% (actual motion 50 ~ 100%); Reaction zone mean sludge concentration 8100mg/L (actual 7000 ~ 10000mg/L); Anaerobic zone stirring intensity 4W/m
3, configure 4 stirrers, separate unit power 1.1kW; Oxygen-starved area stirring intensity 2.5W/m
3, configure 12 stirrers, separate unit power 0.75kW; Aerobic zone aeration intensity 8 ~ 10m
3/ m
2.h, arrange microporous aeration disc 1250, reserved 10 ~ 20% aerobic zone 1 aerators in oxygen-starved area 2, reserved 10 ~ 20% aerobic zone 2 aerators in oxygen-starved area 3 (are reduced into conventional A
2this district of O state of the art is by aerobic operation).
Anaerobic zone hydraulic detention time is 1h; Oxygen-starved area hydraulic detention time is 2.8h; Aerobic zone hydraulic detention time is 4.5h.The denitrification load values scope of oxygen-starved area is 0.035kgNO
3-N/kgMLSS.d (actual motion 0.03 ~ 0.05kgNO
3-N/kgMLSS.d); Sludge loading value is 0.111kgBOD
5/ (kgMLSS.d) (actual motion 0.05 ~ 0.15kgBOD
5/ (kgMLSS.d)); Surface load district, settling region value is 1.2m
3/ m
2.h.
Structure of reactor size: totally 2 groups, often group
(available depth 6m).
Implementation result:
Design influent quality:
COD
Cr：400mg/L；BOD
5：180mg/L；TN：45mg/L；NH
3-N：30mg/L；SS：220mg/L；TP：5mg/L；
After sewage treatment process process of the present invention, main effluent quality all can reach to " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) one-level A below the mark.
Operation energy consumption: 0.2 ~ 0.22kW.h/m
3.
Above-describedly be only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalently replace and improvement etc., all should be included within protection scope of the present invention.
Claims (18)
1. a circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor, is characterized in that, be selected from the arbitrary of following reactor:
Reactor one: comprise the anaerobic zone of setting up successively, the supporting district of the above Anoxic/Aerobic of two-stage, settling region, the supporting district of described Anoxic/Aerobic comprises the oxygen-starved area and aerobic zone of setting up successively, partition wall is provided with between adjacent twoth district, one end of described partition wall is provided with water hole, floating stuffing district is provided with in described aerobic zone, described anaerobic zone is provided with sewage inlet and mud inlet, described oxygen-starved area is provided with sewage inlet, described settling region is provided with sewage outfall and sludge outlet, described sludge outlet connects the mud inlet of described anaerobic zone by returned sluge channel,
Reactor two: comprise the anaerobic zone and the supporting district of the above Anoxic/Aerobic of two-stage of setting up successively, the supporting district of described Anoxic/Aerobic comprises the oxygen-starved area and aerobic zone of setting up successively, partition wall is provided with between adjacent twoth district, one end of described partition wall is provided with water hole, floating stuffing district is provided with in described aerobic zone, described anaerobic zone and last step aerobic zone are closed and to be connected and the internal space formed is settling region, described settling region and described last step aerobic zone contact surface are provided with water hole, described anaerobic zone is provided with sewage inlet and mud inlet, described oxygen-starved area is provided with sewage inlet, described settling region is provided with sewage outfall and sludge outlet, described sludge outlet connects the mud inlet of described anaerobic zone by returned sluge channel.
2. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor as claimed in claim 1, is characterized in that, in described reactor two, described anaerobic zone and last step aerobic zone are closed and be connected and form annulus, and the internal space of described annulus is settling region.
3. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor as claimed in claim 1, it is characterized in that, described anaerobic zone is provided with water conservancy diversion partition wall, by described water conservancy diversion partition wall, anaerobic zone is divided into anaerobic zone A and anaerobic zone B; The two ends of described water conservancy diversion partition wall are provided with two pod apertures.
4. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor as claimed in claim 1, it is characterized in that, described oxygen-starved area is provided with water conservancy diversion partition wall, by described water conservancy diversion partition wall, described oxygen-starved area is divided into oxygen-starved area A and oxygen-starved area B; The two ends of described water conservancy diversion partition wall are provided with two pod apertures.
5. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor as claimed in claim 1, it is characterized in that, described aerobic zone is provided with water conservancy diversion partition wall, by described water conservancy diversion partition wall, aerobic zone is divided into aerobic zone A and aerobic zone B; The two ends of described water conservancy diversion partition wall are provided with two pod apertures.
6. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor as claimed in claim 1, it is characterized in that, described floating stuffing district comprises floating stuffing and floating stuffing device for trapping.
7. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor as claimed in claim 1, it is characterized in that, described anaerobic zone and described oxygen-starved area are provided with submersible agitator.
8. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor as claimed in claim 1, it is characterized in that, described oxygen-starved area and described aerobic zone are provided with aerating system.
9. a circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process, is characterized in that, for carrying out sewage disposal by the arbitrary described circulation flow ring-shaped membrane bioreactor of claim 1 to 8; Described sewage treatment process comprises the following steps:
(A) sewage enters described reactor by two portions, and first part enters anaerobic zone by the sewage inlet of anaerobic zone, and second section enters oxygen-starved area at different levels respectively by the sewage inlet of oxygen-starved area at different levels;
(B) from the sewage of the sewage inlet of anaerobic zone with mix from the returned sluge of settling region, in anaerobic zone, polyP bacteria releases phosphorus under anaerobic environment, transforms the organic pollutant of easily degraded simultaneously, and part itrogenous organic substance is carried out ammonification;
(C) then enter the supporting district of the above Anoxic/Aerobic of two-stage, carry out denitrification denitrogenation in oxygen-starved area at different levels, partial organic substances is degraded removal under the effect of denitrifying bacteria; Be provided with floating stuffing district in aerobic zone at different levels, carry out the absorption of the nitrated and phosphorus of the ammonification of organic further degraded and organonitrogen;
(D) water outlet of last step aerobic zone drains into settling region, and to be purified waste water discharge by mud-water separation, a thickened sludge part is back to anaerobic zone, and another part drains into sludge concentration and dewatering system.
10. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process as claimed in claim 9, it is characterized in that, described anaerobic zone comprises anaerobic zone A and anaerobic zone B; First sewage enter anaerobic zone A, and the stirring pushing effect current downflow of the submersible agitator arranged in the A of anaerobic zone, then enters in the B of anaerobic zone, the stirring pushing effect current downflow of the submersible agitator arranged in the B of anaerobic zone; Then a part is circulated in the A of anaerobic zone, and a part enters first step oxygen-starved area.
11. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process as claimed in claim 9, it is characterized in that, oxygen-starved area at different levels comprises oxygen-starved area A and oxygen-starved area B; The stirring pushing effect current downflow of the submersible agitator that sewage is arranged in the A of oxygen-starved area, then oxygen-starved area B is entered, the stirring pushing effect current downflow of the submersible agitator arranged in the B of oxygen-starved area, then a part is circulated in the A of oxygen-starved area, and a part enters aerobic zone.
12. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process as claimed in claim 9, it is characterized in that, aerobic zone at different levels comprises aerobic zone A and aerobic zone B; Aerobic zone A and aerobic zone B is provided with floating stuffing district; First sewage enter aerobic zone A, then enters aerobic zone B, and a part is circulated in the A of aerobic zone, and a part enters oxygen-starved area or settling region.
13. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process as claimed in claim 9, it is characterized in that, the packing ratio in described floating stuffing district is 30 ~ 60%; Described floating stuffing is polyethylene, polypropylene or urethane, and particle diameter is 15mm ~ 100mm, and bulk specific gravity is 0.96 ± 2g/cm
3, specific surface area >500m
2/ m
3; Described floating stuffing device for trapping retains net by stainless steel porous and forms, and retains net Circularhole diameter 8mm ~ 20mm, and center of circular hole, apart from being 10mm ~ 50mm, retaining net both sides base portion and respectively installs the thick bubble diffuser of a row.
14. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process as claimed in claim 9, is characterized in that, a thickened sludge part is back to the return sludge ratio 50 ~ 100% of anaerobic zone; The mean sludge concentration 8000 ~ 14000mg/L of reaction zone.
15. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process as claimed in claim 9, it is characterized in that, the stirring intensity of anaerobic zone is 4 ~ 5W/m
3, the stirring intensity of oxygen-starved area is 1 ~ 3W/m
3.
16. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process as claimed in claim 9, it is characterized in that, described aerobic zone is provided with aerating system, and aerobic zone aeration intensity is 8 ~ 10m
3/ m
2.h, reserved 10 ~ 20% aerobic zone aerators in next stage oxygen-starved area of aerobic zone are wherein close to.
17. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process as claimed in claim 9, it is characterized in that, the hydraulic detention time of described anaerobic zone is 1 ~ 2h; The hydraulic detention time of described oxygen-starved area is 0.5 ~ 3h; The hydraulic detention time of described aerobic zone is 3.5 ~ 5h.
18. circulation flow ring-shaped multistage Activated sludge-biofilm composite type bioreactor sewage treatment process as claimed in claim 9, it is characterized in that, the denitrification load values scope of described oxygen-starved area is 0.03 ~ 0.06kgNO
3-N/kgMLSS.d; Described sludge loading value is 0.05 ~ 0.15kgBOD
5/ (kgMLSS.d).
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