The concentration integrated system of WWT and mud
The utility model relates to technical field of sewage, relates in particular to a kind of WWT and concentration integrated system of mud based on the MBR Sewage treatment systems.
Membrane bioreactor (Membrane Bioreactor is called for short MBR) is the novel sewage disposal technology that membrane separation technique and biologic treating technique organically combine, and is a kind of new kenel Sewage treatment systems that is combined with biological processing unit by film separation unit.Through 20 years of researches, membrane bioreactor has been obtained very fruitful application aspect WWT, but also has following problem: the film valency of (1) great number can make the initial investment of Sewage treatment systems excessive; (2) in the operational process serious film to pollute the replacing frequency that will cause membrane module too high and energy consumption is excessive, thereby working cost is increased; (3) after the WWT, excess sludge need be transferred to another place and carry out concentration, and facility structure is complicated, increases cost of floor space, simultaneously, in transportation and treating processes, causes the discharging of muddy water and foul smell, contaminate environment.
And air-float technology has mud-water separation excellent in efficiency, advantage that thickened sludge concentration is high as the mud concentration technology.Can air-float technology be attached in the membrane bioreactor, and with the mud concentration technology in advance, the operational conditions of improving membrane module becomes the industry concerned issue.
The utility model content
The main purpose of the utility model is to the problems referred to above; On traditional MBR Sewage treatment systems basis; Through between biochemical treatment facility and membrane sepn facility, adding the air supporting facility, provide the concentration integrated system of a kind of WWT and mud, in advance with the suspended sludge concentrating and separating; Guarantee that membrane module works under low sludge concentration condition, and then improve membrane flux, reduce film and pollute, reduce film investment and running cost and protect environment.
The utility model solves the technical scheme that its technical problem adopted:
The concentration integrated system of a kind of WWT and mud; Comprise the biological treatment tank and the membrane sepn pond that constitute the film biological treatment system; Be provided with in the said biological treatment tank anaerobic zone, oxygen-starved area, in establish the aerobic zone of aerator; And connection water inlet pipe, mud return line and mixed-liquor return pipe; The two ends of mixed-liquor return pipe are communicated with the oxygen-starved area with aerobic zone respectively; Said membrane sepn pond is provided with membrane module, aeration cleanser and is provided with rising pipe and the membrane sepn shore pipe, it is characterized in that between said biological treatment tank and membrane sepn pond, setting up the air flotation pool that connects the air supporting machine, and forms the whole pond of being passed through three pond disjunctors of D, the separation of E partition wall by biological treatment tank to membrane sepn pond successively; Said air flotation pool is in the air supporting zone of action that the built-in dissolved air release of being crowded around by enclosure wall is set near D partition wall bottom; Outside, air supporting zone of action is the flotation separation zone, on air flotation pool top slag scraper, ash pit is set, and the slag chute shore pipe of said ash pit connects slag chute mud vent pipe and passes through the anaerobic zone that said mud return line connects biological treatment tank; Said biological treatment tank is communicated with air flotation pool through the duct that is provided with on the D partition wall, and said air flotation pool is communicated with the membrane sepn pond through the duct that is provided with on the E partition wall; Be respectively equipped with the air supporting shore pipe in air supporting zone of action and bottom, flotation separation zone.
In said air supporting zone of action and flotation separation zone, be respectively equipped with bucket.
The some liquid pass holes of the duct that is provided with on the said D partition wall for offering at interval in D partition wall lower horizontal.
The duct that is provided with on the said E partition wall is pipeline or horizontal gap.
Said air supporting machine is pressure air-dissolving air-float machine, shallow air-floatation machine or air flotation turbo.
Said membrane module is curtain type film assembly, plate type membrane component or manages thread membrane module.
The beneficial effect of the utility model is: (1) is through introducing air flotation pool in traditional MBR pond; In advance with the suspended sludge concentrating and separating; Guarantee that the membrane module in the membrane sepn pond works under low sludge concentration condition; Thereby sludge concentration in the raising biological treatment tank reduces membrane module and pollutent touch opportunity, alleviates membrane module pollution level and then raising membrane flux, reduces the film pollution, reduces film investment and film running cost; (2) can in WWT, through dissolved air flotation the active sludge on floating be carried out mud and concentrate, obtain thickened sludge; And the active sludge that floats does not need to carry out concentration again; Can directly carry out sludge dewatering, reduce the return sludge ratio of biochemical treatment section, save the mud enriching section in the follow-up sludge handling process; The sludge water that reduces the generation of mud concentration process is to the sewage treatment plant inflow effects of load; The excess sludge of its discharging can directly carry out sludge dewatering treatment, has reduced foul smell discharging in the sewage work, helps improving environment.(3) the excess sludge organic content that goes out through dissolved air flotation raises, and has strengthened the performance that excess sludge utilizes again.In a word, use the utility model, effluent quality can reach the one-level A standard of " urban wastewater treatment firm pollutant emission standard ", BOD, COD, NH
3-N reaches IV class water water quality requirement; The thickened sludge water ratio is reduced to 93-94%, membrane flux improves 50%, and film investment and film running cost are lower than traditional MBR technology, are particularly useful for municipal effluent and part Industrial Wastewater Treatment engineering.
Description of drawings
Fig. 1 is the main TV structure synoptic diagram of the utility model;
Fig. 2 is the F-F sectional view of Fig. 1.
Among the figure: 1 water inlet pipe, 2 slag chute shore pipes, 21 sludge reflux pumps, 22 mud vent pipes, 23 mud overboard pumps, 24 mud return lines; 3 mixed-liquor return pipes, 31 mixed-liquor return pumps, 4 aerators, 5-6 air supporting shore pipe, 51-53 bucket, 7 ash pits; 8 slag scrapers, 9 aeration cleansers, 10 membrane modules, 11 membrane sepn shore pipes, 12 rising pipes, 13 air supporting machines; 131 dissolved air releases, 14-15 stirrer, 16E partition wall duct, 17 enclosure walls, 18D partition wall duct; The A biological treatment tank, A1 anaerobic zone, A2 oxygen-starved area, A 3 aerobic zones, B air flotation pool, B1 air supporting zone of action, B2 flotation separation zone, C membrane sepn pond, D, E partition wall.
Below in conjunction with accompanying drawing and embodiment the utility model is specified.
Fig. 1～Fig. 2 illustrates a kind of WWT and the concentration integrated system of mud; Comprise the biological treatment tank A and the membrane sepn pond C that constitute the film biological treatment system; Be provided with in the above-mentioned biological treatment tank A anaerobic zone A1, oxygen-starved area A2, in establish the aerobic zone A3 of aerator 4; And connecting water inlet pipe 1, mud return line 24 and mixed-liquor return pipe 3, the two ends of mixed-liquor return pipe 3 are communicated with oxygen-starved area A2 with aerobic zone A3 respectively, in anaerobic zone A1 and oxygen-starved area A2, also are respectively equipped with stirrer 14,15.Above-mentioned membrane sepn pond C is provided with membrane module 10, aeration cleanser 9 and is provided with rising pipe 12 and membrane sepn shore pipe 11; It is characterized in that between above-mentioned biological treatment tank A and membrane sepn pond C, setting up the air flotation pool B that connects air supporting machine 13; And form whole pond by the biological treatment tank A three pond disjunctors that C separates through D, E partition wall successively to the membrane sepn pond; Said air flotation pool B is at the air supporting zone of action B1 that the built-in dissolved air release 131 of being crowded around by enclosure wall 17 is set near D partition wall bottom; B1 outside in air supporting zone of action is flotation separation zone B2; Slag scraper 8, ash pit 7 are set on the top of air flotation pool B, and the slag chute shore pipe 2 of ash pit connects slag chute mud vent pipe 22 through mud overboard pump 23, and connects the anaerobic zone A1 of biological treatment tank A through mud return line 24 through sludge reflux pump 21; Above-mentioned biological treatment tank A is communicated with air flotation pool B through the duct 18 that is provided with on the D partition wall, and air flotation pool B is communicated with membrane sepn pond C through the duct 16 that is provided with on the E partition wall.Be respectively equipped with air supporting shore pipe 5,6 in the bottom of air supporting zone of action B1 and flotation separation zone B2.
For the benefit of mud sinks, and in air supporting zone of action B1 and flotation separation zone B2, is respectively equipped with bucket, and as shown in Figure 2, B1 is provided with bucket 51 in the air supporting zone of action, and B2 is provided with bucket 52,53 in the flotation separation zone.
Above-mentioned air supporting machine 13 can adopt commercially available pressure air-dissolving air-float machine, shallow air-floatation machine or air flotation turbo.Adopted the pressure air-dissolving air-float machine in the present embodiment, as shown in the figure, the water-in of pressure air-dissolving air-float machine is communicated with air flotation pool B, and its dissolved air release 131 extend in the air supporting zone of action B1 through the air water output tube.
The some liquid pass holes of duct 18 for offering at interval in D partition wall lower horizontal that are provided with on the above-mentioned D partition wall, the position of liquid pass hole is corresponding with the position of dissolved air release 131, like this, makes the mixed solution of entering mix, contact with dissolved air water rapidly.Pipeline or horizontal gap can be adopted in the duct 16 that is provided with on the above-mentioned E partition wall, and duct 16 is for to be positioned at the horizontal gap that bucket 53 tip positions are offered at the E partition wall in this example.
Above-mentioned membrane module 10 can adopt curtain type film assembly, plate type membrane component or manage thread membrane module.Adopted plate type membrane component in this example.
Working process of the utility model and principle:
Referring to Fig. 1～Fig. 2, sewage at first gets into biological treatment tank A through water inlet pipe 1, passes through anaerobic zone A1 successively; Oxygen-starved area A2, aerobic zone A3 carries out anaerobism, anoxic, aerobic treatment, and the mixed solution part after the processing is returned oxygen-starved area A2 through mixed-liquor return pipe 3; All the other mixed solutions get into the air supporting zone of action B1 of air flotation pool B through D partition wall duct 18, with the dissolved air water thorough mixing, contact, through absorption, the pop-up effect of microbubble; B2 floats the active sludge in the mixed solution to liquid level in the flotation separation zone; Form scum silica frost, regularly scum silica frost is scraped into ash pit 7 through slag scraper 8, a part of mud gets into the anaerobic zone A1 of biological treatment tank A through mud return line 24 through sludge reflux pump 21; Excess sludge gets into slag chute mud vent pipe 22 through mud overboard pump 23, and the discharge system.Treating water part after handle the flotation separation zone gets into through return line in dissolved air water force (forcing) pump and the dissolving of pressure air-dissolving air-float machine 13 and forms dissolved air water, resupplies dissolved air release 131 to accomplish the air supporting effect; All the other treating water get into membrane sepn pond C as air flotation pool B water outlet through E partition wall duct 16, and the filtering separation effect through membrane module 10 finally produces qualified water outlet up to standard, through the suction of water pump, discharge through rising pipe 12.The mud that in air flotation pool B, precipitates is regularly discharged through shore pipe 5,6; The pollutent that in the C of membrane sepn pond, comes out through membrane sepn is regularly discharged through membrane sepn shore pipe 11, and the aeration turbulent flow that forms through aeration cleanser 9 in time cleans up membrane module 10 adsorbed contaminants.
The concentration integrated system of WWT that the utility model provides and mud is particularly useful for city sewage treatment works, is applicable to part Industrial Wastewater Treatment engineering simultaneously.In above-mentioned sewage treatment process, the biological treatment in the biological treatment tank A can adopt A/O, A
2Multiple sewage treatment process such as/O, branch water inlet.
Use the utility model, when influent quality satisfied " sewage enters the municipal sewage system water quality standard " (CJ3082-1999) standard, effluent quality can reach the one-level A standard of " urban wastewater treatment firm pollutant emission standard ", BOD, COD, NH
3-N reaches IV class water water quality requirement; The thickened sludge water ratio is reduced to 93-94% and the mud organic content raises, and has strengthened the usability again of excess sludge; Membrane flux improves 50%, and film investment and film running cost are lower than traditional MBR technology; And, can reduce the foul smell discharging of sewage work, help reducing odor pollution.
Above content is not that structure, shape to the utility model done any pro forma restriction.Every technical spirit according to the utility model all still belongs in the scope of the utility model technical scheme any simple modification, equivalent variations and modification that above embodiment did.