Self-priming fluid jet nozzle aeration external membrane bioreactor
Technical field
The invention belongs to the equipment that utilizes biochemical technology and membrane separation technique to process waste water, particularly a kind of Self-priming jet aeration external membrane bioreactor sewage treatment equipment.
Background technology
Membrane bioreactor is the combination of traditional activated sludge process and membrane separation technique.Microbial Communities in Activated Sludge carries out biological degradation to organism in the former water, reaches to remove organic purpose.Film separation unit has replaced the second pond in the traditional technology, can hold back suspended solid in the former water, colloidalmaterial etc., guarantees high-quality and stable effluent quality.Membrane bioreactor has been compared following advantage with traditional water technology: floor space is little, only is 1/3~1/2 of traditional technology; Effluent quality is good, but reuse; Turbidity is starkly lower than traditional technology, for the removals of colibacillus, phage and poisonous Micropollutants clearly; Sludge concentration is high in the biological processing unit, and mud is long age, and is high to organic removal rate; For nitrogen and phosphorus pollutants higher removal effect is arranged; Compare with traditional technology, the surplus sludge volume that membrane bioreactor produces is few, has reduced the expense that excess sludge is disposed.Membrane biological reactor process is simple, volume is little, operational management is convenient, be easy to realize automatic control.
According to the relative position of membrane module and bio-reactor, membrane bioreactor is divided into submerged membrane bioreactor and external membrane bioreactor.
External membrane bioreactor is separated bio-reactor and membrane module, the mixed solution of bio-reactor enters membrane module after supercharging, see through under pressure film and obtain system's water outlet, active sludge then is trapped, and is back to (Fig. 5) in the bio-reactor with concentrated solution.The external membrane bioreactor characteristics are stable and reliable operations, be easy to membrane washing, change and set up, and membrane flux is generally larger.But known external membrane bioreactor adopts blast aeration to provide metabolic needed air for active sludge more, and works the effect of mixing.Be that biological reaction tank configuration blast aeration system needs expensive investment, caused the membrane bioreactor system fixed investment too high with the membrane separation plant of high cost.The blast aeration process needs lot of energy, also is difficult for carrying out the denitrification process operation.Under the general condition, for reducing pollutent in the deposition on film surface, prolong the membrane washing cycle, external film separation unit needs recycle pump that higher face cross-flow flow velocity is provided, the water circulation amount is large, power charge is high, it is reported, existing known external membrane bioreactor unit consumption of energy is very high, generally at 3~5kWh/m
3, approximately be 10~15 times of conventional activated sludge process.Membrane bioreactor utilizes the concentrated characteristic of membrane sepn to improve the sludge concentration of biological reaction tank, thereby increases the removal ability of biological reaction tank, is easy to form film and pollutes but sludge concentration is too high, and under certain condition, sludge concentration is higher, and membrane flux is lower; Have research to think, the face cross-flow velocity is not more high better, and the increase of crossflow velocity is so that the attenuation of film surface contamination layer might cause irreversible pollution, and the shearing force that the high speed rotating of pump produces can make the certain micro-organisms thalline produce deactivation phenomenom.Therefore, should manage existing external membrane bioreactor wastewater processing technology is improved, solve the problems such as present known external membrane bioreactor investment is high, working cost is high.
Summary of the invention
The object of the invention is to overcome the defectives such as the investment of known external membrane bioreactor is high, working cost is high, and a kind of easy handling and maintenance, self-priming fluid jet nozzle aeration external membrane bioreactor that the investment working cost is lower are provided.
Equipment of the present invention is comprised of integrated bio reactor, external membrane separating unit and self-priming fluid jet nozzle aeration unit.
Described integrated bio reactor is comprised of the degassed pond on the deep aerating biochemical reaction tank that is positioned at the bottom and top.In biochemical reaction tank, be provided with center water conservancy diversion inner core, the water conservancy diversion inner core is for falling the stream pipe, circular channel between pool wall and inner core is upspout, circulation force (forcing) pump water sucking mouth is arranged in the degassed pond, self-priming fluid jet nozzle (3) water outlet is downward, be installed in inner core central upper portion position, raw water inlet is installed in self-priming fluid jet nozzle (3) below.Described external membrane separating unit is comprised of membrane module, circulation force (forcing) pump, membrane module washing unit, pipeline, valve, instrument and electrical control etc.; Described membrane module adopts the external placed type filtered version, and pore size filter is between (micro-filtration) between 0.1~0.4 μ m and 0.05~0.1 μ m (ultrafiltration); The necessary membrane module washing unit of membrane module configuration, this device can be combined into a whole set of equipment with membrane bioreactor as required, also can be designed to mobile unit, and realization one cover washing unit is served a plurality of film bioreactor devices.
The self-priming fluid jet nozzle aeration of the present invention external membrane bioreactor is processed the waster water process flow process:
Pending waste water at first enters the self-priming fluid jet nozzle in deep aerating biochemical reaction tank central draft tube top (3) below by raw water inlet (11); What the circulation force (forcing) pump produced injects the reaction tank central draft tube through the concentrated cycle of higher pressure liquid of membrane module behind self-priming fluid jet nozzle (3) aeration, make the fluid jet nozzle below form the High Speed Turbulent shear zone, fluid jet nozzle utilizes cycle of higher pressure liquid to produce the negative pressure air amount and make it be dispersed into micro-bubble through shower nozzle, the water inlet of carrying the fluid jet nozzle below secretly forms the mixed solution that is rich in oxygen and active sludge and flows downward along central draft tube, carry out simultaneously the high-efficiency aerobic biochemical reaction, after arriving reactor bottom, upwards backflow through annular upspout again and arrive annular upspout top, most of oxygen is consumed by biochemical reaction in the mixed solution at this moment, a part of mixed solution jet under shearing wherein, operation so moves in circles, so, sewage is by repeatedly oxygenation, bubble and microbial bacteria micelle are constantly sheared refinement, form fine and close tiny flocs unit, carry out the efficient biochemical reaction in the reciprocation cycle process, the organic pollution materials in the waste water is degraded; It more than is biochemical reaction cycle process.
Another part mixed solution enters degassed pond, sloughs the air pocket in the mixed solution, is beneficial to enter the membrane sepn recycle system and carries out jet-flow aeration; Simultaneously, mud in the mixed solution has part and sinks at the bottom of the degassed pond, and pool bottom sludge backflash with a slope is slipped to the biochemical reaction tank central draft tube through degassed pond, the biochemical working cycle of sustainable participation, this process can reduce the circulation fluid sludge concentration that enters film separation unit, is conducive to alleviate film and pollutes; Mixed solution after the degassed and mud-water separation enters membrane module and carries out filtering separation after the supercharging of circulation force (forcing) pump, concentrated solution after the filtration enters the biochemistry pool central draft tube and continues biochemical working cycle behind the fluid jet nozzle aeration, film separating system sees through liquid and is system's water outlet; It more than is the membrane sepn working cycle.
Above two processes are moved continuously, move in circles, and can realize continuous flow and make that organism is purified by aerobic oxidation in the waste water.
Beneficial effect of the present invention is:
1. in the outlet of external placed type film separation unit circulation fluid self-priming fluid jet nozzle aeration is set and replaces blast aeration, save the aerating system facility investment, self-priming fluid jet nozzle is simple in structure, cost is low, Maintenance and Repair are convenient.
2. utilize circulation force (forcing) pump energy more than needed and fluid jet nozzle to carry out aeration, save the large energy that the blast aeration process consumes, the advantage of biochemical reaction tank is integrated biological fluidized bed and two kinds of water technologies of deep aerating, mud is the suspension fluidized state in the reactor, mixed solution muddy water gas three-phase is mixed more even, the transfer efficiency of oxygen is higher, improves biochemical reaction efficient, so the reactor total energy consumption is lower, reduced ton water treatment running cost.
3. most of biochemical circulation mixed solution enters degassed pond from upspout and sloughs air pocket, carries out simultaneously simple precipitation, and the sludge concentration that enters film separation unit with reduction enters membrane module and filters after the supercharging of circulation force (forcing) pump; High pressure mixing liquid easily reaches turbulence state, can make membrane sepn long-play and be difficult for film and pollute under the cross-flow velocity of lower film surface, prolongs film cleaning interval and work-ing life, reduces energy consumption, reduces film cleaning, maintenance and replacement charge.
Description of drawings
Fig. 1 is self-priming fluid jet nozzle aeration external membrane bioreactor process flow sheet
Fig. 2 is self-priming fluid jet nozzle aeration unit (b) schematic diagram
Fig. 3 is external membrane assembly unit (c) schematic diagram
Fig. 4 is integrated bio reactor (a) schematic diagram
Fig. 5 is existing external membrane bioreactor schematic diagram
A-integrated bio reactor among the figure, the self-priming fluid jet nozzle aeration unit of b-, c-external membrane separating unit, 1-deep aerating biochemical reaction tank, the degassed pond of 2-, the self-priming fluid jet nozzle of 3-, the 4-air flowmeter, 5-circulation force (forcing) pump, 6-tensimeter, 7-external membrane assembly, the 8-Graceful mouth of a river, 9-membrane module washing unit, 10-clean water basin, the 11-raw water inlet, 12-circulation force (forcing) pump water sucking mouth.
Embodiment:
Below in conjunction with accompanying drawing technological process of the present invention is further described.
As shown in Figure 1, raw water inlet (11) is positioned at self-priming fluid jet nozzle (3) below on deep aerating biochemical reaction tank (1) central draft tube top, and circulation force (forcing) pump water sucking mouth (12) is arranged in degassed pond (2); Mixed solution was by external membrane assembly (7) filtering separation after the circulation force (forcing) pump sucked degassed and simple precipitation by the water sucking mouth, high speed flow concentrated solution after the filtration is injected the biochemistry pool central draft tube behind self-priming fluid jet nozzle (3) aeration, can below shower nozzle, form the High Speed Turbulent shear zone, the gas that ejector is sucked further is dispersed into tiny bubble, and the former water of carrying the shower nozzle below secretly is intake, the combined sewage that oxygen and active sludge are rich in formation flows downward along guide shell, carries out simultaneously the high-efficiency aerobic biochemical reaction; After the sewage mixed solution arrives reactor bottom, upwards backflow through annular upspout again and arrive the upspout top, most of oxygen is consumed by biochemical reaction in the mixed solution at this moment, a part of mixed solution jet under shearing wherein, operation so moves in circles, so, the sewage mixed solution is by repeatedly oxygenation, bubble and microbial bacteria micelle are constantly sheared refinement, and the fine and close tiny flocs unit of formation, carry out the efficient biochemical reaction in the reciprocation cycle process, the organic pollution materials in the waste water obtains degraded and removes; Another part mixed solution enters degassed pond, slough the air pocket in the mixed solution, simultaneously, the mud in the mixed solution has part and sinks at the bottom of the pond, pool bottom sludge backflash with a slope is slipped to the biochemical reaction tank central draft tube through degassed pond, the biochemical working cycle of sustainable participation; Mixed solution after the degassed and simple precipitation enters membrane module and carries out filtering separation after the supercharging of circulation force (forcing) pump, concentrated solution enters next time biochemical working cycle of biochemistry pool central draft tube continuation again after filtering behind self-priming fluid jet nozzle (3) aeration, membrane filtration sees through liquid and is system's water outlet, and water outlet enters clean water basin (10).Above process is moved continuously, moves in circles, and can realize continuous flow and Organic Pollutants in Wastewater is degraded and is purified.Membrane module washing unit (9) cleans membrane module as required.
Below be illustrated for example, but claim scope of the present invention is not limited only to this.
Embodiment 1, utilize apparatus of the present invention to process a municipal wastewater factory waste water, the Inlet and outlet water index is:
| Project |
Influent quality |
Effluent quality |
Degree for the treatment of (%) |
| BOD
5(mg/L)
|
100~180 |
≤10 |
≥90~94.4 |
| COD(mg/L) |
250~450 |
≤15 |
≥80~89.00 |
| pH |
6~9 |
6~9 |
/ |
| PO
4-P(mg/L)
|
3~6 |
≤0.5 |
≥83.3~87.5 |
| Total nitrogen (mg/L) |
24~45 |
≤15 |
≥40~66.7 |
| Ammonia nitrogen (mg/L) |
20~35 |
≤5 |
≥75~85.7 |
Treatment effect is higher than GB18918-2002 one-level A standard, and stable water outlet.
Embodiment 2, utilize apparatus of the present invention treatment of simulated sanitary sewage, reaction unit water inlet index is:
Treatment effect is better than GB18918-2002 one-level A standard, and stable water outlet.
| Project |
Influent quality |
Effluent quality |
Degree for the treatment of (%) |
| COD(mg/L) |
500~600 |
≤40 |
≥90~92.00 |
| pH |
6~9 |
6~9 |
/ |
| PO
4-P(mg/L)
|
5~8 |
≤0.5 |
≥90~93 |
| Total nitrogen (mg/L) |
30~45 |
≤14 |
≥40~66.7 |
| Ammonia nitrogen (mg/L) |
20~25 |
≤5 |
≥75~80 |