CN102616986B - Dynamic membrane automatic water flow-out solid-liquid separation method applicable to domestic sewage treatment - Google Patents
Dynamic membrane automatic water flow-out solid-liquid separation method applicable to domestic sewage treatment Download PDFInfo
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Abstract
The invention provides a dynamic membrane automatic water flow-out solid-liquid separation method applicable to domestic sewage treatment. The method includes: adding powder particles with fine water permeable performance into activated sludge to form biological intensified powder mixed liquid to structurally improve the activated sludge; combining with the dynamic membrane separation technique to greatly improve the filtering capacity and water permeability of dynamic membrane filter cakes; performing solid-liquid separation of discharged water by allowing a dynamic membrane component to be driven by a water head having lower fixed gravity action and formed by liquid level waterhead between the upper liquid level of the immersed dynamic membrane component in a reaction device and a water outlet, stably controlling the unit area membrane filter flux of the dynamic membrane component to be more than 20-60L/m2h and the continuous operating time to be longer than 120h without action of external power; and allowing the dynamic membrane to completely shed with the air backwashing time being 1min-2min and the air inlet pressure being 9.8-49kPa. The dynamic membrane component does not need to be chemically cleaned regularly, and control and operation of the method can be automatically controlled in the whole process. The dynamic membrane solid-liquid separation technique can realize automatic water flowing out under differential pressure of low-liquid-level waterhead, energy consumption is greatly reduced, operation process is simplified, and discharged water is high in quality.
Description
Technical field
This invention relates to a kind of sanitary sewage disposal Dynamic Membrane gravity flow water outlet solid-liquid separating method that is applicable to, and can realize Dynamic Membrane gravity flow water outlet under the segregation drive, need not the power-equipment effect, saves energy consumption, belongs to sanitary sewage disposal field new membrane solid-liquid separation technique.
Background technology
Combined with bio-reactor and the new membrane bio-reactor that forms relies on its effluent quality reliable by membrane sepn, the advantage such as the convenient and compact construction of operating method, floor space are little is considered to one of the most promising wastewater treatment and reuse technology of 21 century.Submerged membrane bio-reactor binding film technology and bioreactor technology are new highlights of high-efficiency wastewater treatment system.But the example that the submerged membrane bio-reactor is used in large-scale sewage disposal is few, causes the reason of this present situation mainly to be: too high operation cost, energy consumption consume the decline of high, membrane flux and operation that some uncertain factor causes and the difficulty of operation etc.Need to further investigate and improve it, make it in the Practical Project of wide field more, be able to promotion and application.
Dynamic membrane is more special a kind of in the separatory membrane, utilizes that particulate matter plays the solid-liquid separation effect at the filter cake that the macropore supporting body surface forms in the mixed solution to be filtered.Bioreactor of dynamic membrane is micro-filtration or the ultra-filtration membrane that uses in the wide aperture nethike embrane replacement conventional membrane bioreactor, utilizes the sludge blanket that forms on wide aperture nethike embrane surface in the operational process to play a kind of novel process of crown_interception.This technique has kept the advantage of conventional membrane bioreactor, has significantly reduced the cost of membrane module simultaneously, and film pollutes and more easily is effectively controlled.
According to the difference of membrane module modes of emplacement, membrane bioreactor can be divided into two kinds of split type and integral types.The membrane flux of split type system is higher, and membrane module is easy to clean and maintenance, but energy consumption is higher; The energy consumption of Intergration system is low, but difficult clean and maintenance.The present invention combines detachable membrane assembly clean and maintenance conveniently and the low advantage of integral type energy consumption, make up integral type gravity-elution formula Dynamic Membrane solid-liquid separating method, macropore stainless (steel) wire supporter (flat or tubular type) is immersed in the biological reaction apparatus as membrane module, utilize the liquid level difference between the interior liquid level of reaction unit and the water outlet to drive the dynamic membrane filtering water outlet, save the water outlet suction pump, greatly reduced energy consumption; Also can reduce simultaneously the interior mud granule of biological reaction apparatus to the speed of film surface transport, the reduce mud particle pollutes the time that occurs at the film surface precipitation thereby delay film.In addition, the aeration of membrane module below not only provides the oxygen source of microbial consumption, and the bubble that produces carries out souring to the film surface, has slowed down to a certain extent the pollution on film surface.
Summary of the invention
The object of the present invention is to provide a kind of municipal sewage treatment Dynamic Membrane gravity flow water outlet solid-liquid separating method that is applicable to, the method utilizes the poor formed fixedly action of gravity head of liquid level water level between the interior immersion type membrane component top liquid level of reaction unit and the water outlet to carry out the solid-liquid separation water outlet, thereby simplify the operation energy efficient.
The object of the invention is to overcome the high deficiency of membrane bioreactor power consumption in the municipal sewage treatment, develop a kind of Dynamic Membrane gravity flow water outlet solid-liquid separating method that is applicable to sanitary sewage disposal, by in active sludge, adding the powder granule (such as powder sintered diatomite, Powdered Activated Carbon etc.) with good water permeability, form biological reinforced powder mixed solution, improve the active sludge structure; In conjunction with dynamic membrane separation technology, greatly improved the filtration water permeable ability of Dynamic Membrane mud cake; Can realize utilizing the poor formed fixedly action of gravity head driving dynamic film component of liquid level water level (flat or tubular type) between the interior immersion dynamic film component top liquid level of reaction unit and the water outlet to carry out the solid-liquid separation water outlet, need not the additionaling power effect, operation is easy and energy consumption is low.
The present invention proposes is applicable to sanitary sewage disposal Dynamic Membrane gravity flow water outlet solid-liquid separating method, the unloading phase that described method being divided into biological reinforced powder and adding first spontaneous the cultivation and biological reinforced powder mixed solution cultivate device stable operation stage after the maturation; All comprise the precoating of Dynamic Membrane gravity in aforementioned two stages, Dynamic Membrane gravity filtration water outlet and Dynamic Membrane Air Reverse flushing three phases, adopt biological reinforced powder granule to form Dynamic Membrane on the dynamic film component surface and carry out solid-liquid separation, described dynamic film component immersion is installed in the dynamic membrane bioreactor, gas blower by aeration tube to dynamic membrane bioreactor bottom aeration, aeration tube is positioned at the dynamic film component below, stirrer inserts in the dynamic membrane bioreactor, intake pump is connected dynamic membrane bioreactor top one end water-in by pipeline with valve, and by time relay control water intake mode, water-in is higher than liquid level in the dynamic membrane bioreactor, the poor fixedly action of gravity head that forms of liquid level water level in the dynamic membrane bioreactor between immersion dynamic film component top liquid level and the water outlet; Concrete steps are as follows:
(1) unloading phase that biological reinforced powder adding spontaneous cultivation first
Be that the municipal wastewater treatment plant active sludge of 4900-5100mg/L adds powder granule and improves the active sludge intermixture characteristic to the MLSS concentration that is arranged in dynamic membrane bioreactor, and as microbe carrier, adopt the spontaneous culture method of microorganism to cultivate biological reinforced powder granule; Powder granule adds first day, in dynamic membrane bioreactor, once add the 5000mg/L powder granule, water inlet, effluent adopting Continuous Flow operation scheme in this stage, dissolved oxygen concentration is 2-3mg/L in the control dynamic membrane bioreactor, hydraulic detention time 8-10 hour; Filter water outlet by active sludge and the not cultured powder granule that begins to add in dynamic film component surface formation Dynamic Membrane, finish the precoating process of dynamic film component; Through 10-15 days cultivation domestication, the MLSS concentration in the dynamic membrane bioreactor maintained 10000-12000 mg/L, and biological reinforced powder mixed solution forms; Afterwards, device enters stable operation stage; In the unloading phase that whole biological reinforced powder adds spontaneous cultivation first, Dynamic Membrane continuous effluent operational process comprises the precoating of Dynamic Membrane gravity, Dynamic Membrane gravity filtration water outlet and the flushing of Dynamic Membrane Air Reverse; Powder granule is 10-35 micron powder burned diatomite or 40-80 micron Powdered Activated Carbon;
(2) the Dynamic Membrane stable operation stage after the biological reinforced powder mixed solution cultivation maturation
The Continuous Flow operation scheme is all adopted in water inlet, water outlet, water inlet is degraded by the biological reinforced powder mixed solution of intake pump elder generation in dynamic membrane bioreactor, control dynamic membrane bioreactor dissolved oxygen concentration is 0.5-1.0mg/L, sludge age is controlled at 28-32d, calculates the powder granule weight that needs replenish according to material balance; Biological reinforced powder Dynamic Membrane operational process comprises the precoating of Dynamic Membrane gravity, Dynamic Membrane gravity filtration water outlet and the flushing of Dynamic Membrane Air Reverse in this stage;
Wherein: the unloading phase that biological reinforced powder adding spontaneous cultivate first and the biological reinforced powder mixed solution Dynamic Membrane stable operation stage of cultivating after the maturation include the precoating of Dynamic Membrane gravity, Dynamic Membrane gravity filtration water outlet and the flushing of Dynamic Membrane Air Reverse, concrete operations are as follows:
1) Dynamic Membrane gravity precoating
During the Dynamic Membrane precoating, dynamic film component begins water outlet under the vacuum pump suction function, and dynamic film component continues water outlet under fixedly the action of gravity head drives afterwards; The unloading phase that biological reinforced powder adding spontaneous cultivation first: by cultured biological reinforced powder mixed solution is not in dynamic film component surface formation Dynamic Membrane fully, the precoating time is 15-20min; Biological reinforced powder mixed solution is cultivated the Dynamic Membrane stable operation stage after the maturation: biological reinforced powder mixed solution gradually supported net is held back the formation Dynamic Membrane, and the Dynamic Membrane precoating is finished and continued 15-20min;
2) Dynamic Membrane gravity filtration water outlet
After the Dynamic Membrane precoating finishes, switch by pipeline valve, enter the Dynamic Membrane gravity filtration water outlet stage, liquid level water level in reaction unit between immersion dynamic film component top liquid level and the water outlet is poor to be formed under fixedly the action of gravity head drives, and guarantees that the biological reinforced powder Dynamic Membrane that forms can the Self-flow filtering water outlet; Because adding the difference of the different dynamic film component structures with adopting of powder granule, flux has difference during Dynamic Membrane gravity filtration gravity flow water outlet, and the unit surface Membrane Filtration Flux of general control dynamic film component is stabilized in 20L/m
2H-60L/m
2More than the h, continuous operating time surpasses more than the 120h;
In the dynamic membrane filtering process, the cross-flow on Dynamic Membrane surface is formed by supporter bottom aeration mode, also controls simultaneously the growth of Dynamic Membrane thickness for the mixed solution oxygenation.Gas-water ratio determines according to calculation of oxygen demand, minimumly is not less than 1: 1.
3) Dynamic Membrane Air Reverse flushing
When Dynamic Membrane gravity filtration effluent flux drops to preset value (when adding powder sintered diatomite particle: 40L/m
2H-60L/m
2H; When adding the Powdered Activated Carbon particle: 15L/m
2H-30L/m
2H) time, need Dynamic Membrane is carried out back flushing, adopt Air Reverse flushing time 1 min-2 min, intake pressure 9.8-49 kPa, Dynamic Membrane is come off fully; Dynamic film component does not need regular matting; Control and operation can whole-course automation controls.
Among the present invention, adopt 180-200 order stainless (steel) wire or nylon wire as dynamic film component, supporting body structure adopts flat or tubular type, according to the required supporting network total area of design flux calculative determination, and according to single supporting network size, selects the supporting network component count.
Among the present invention, the burned diatomite powder of employing good water permeability or active carbon powder improve the water permeability of Dynamic Membrane mud cake as microbe carrier, thereby realize Dynamic Membrane gravity flow water outlet under the fixedly gravity head effect.
Among the present invention, during the Dynamic Membrane precoating, dynamic film component begins water outlet under the vacuum pump suction function, switches by valve afterwards, dynamic film component continues water outlet under fixedly the action of gravity head drives, biological diatomite (or biological activated carbon) mixed solution gradually supported net is held back the formation Dynamic Membrane.Water outlet concentration of suspension during the precoating is higher, need be back in the reactor assembly.
Among the present invention, described action of gravity head height is 0.2-0.4 rice.
Compare outstanding advantages of the present invention with traditional technology:
1. whole system is in conjunction with the Dynamic Membrane solid-liquid separation technique, and system architecture is simply compact, energy consumption is low.
2. the powder granule with good water permeability that adds in the reaction unit is (such as powder sintered diatomite, Powdered Activated Carbon etc.), greatly improved the filtration water permeable ability of Dynamic Membrane mud cake, under can realizing that the poor formed fixedly action of gravity head of the liquid level water level between the immersion dynamic film component top liquid level and water outlet drives in reaction unit, realize dynamic membrane filtering gravity flow water outlet, need not the additionaling power effect, save traditional water outlet suction pump or the control unit of water outlet intermittently, and it is low to have an acting head, filter out the characteristics that water flux is large and parallel-adder settle-out time is long; Can be used as simultaneously microbe carrier, strengthened largely microorganism adsorption and the place of adhering to, the interior microorganism active of reactor is strengthened greatly, improve pollutant removal.
3. membrane module adopts macropore stainless (steel) wire or nylon wire to do supporter, and cost of investment is low, good effect of separating solid from liquid; The pollution of Dynamic Membrane mud cake and macropore stainless (steel) wire or nylon nethike embrane is lighter, easy to control under the gravity head effect, back flushing convenient.
Description of drawings
Fig. 1 is embodiment 1 process flow sheet.
Number in the figure: 1 is dynamic membrane bioreactor; 2 is intake pump; 3 is stirrer; 4 is dynamic film component; 5 is gas blower; 6 are Dynamic Membrane gravity flow water outlet; 7 time relays; H is the poor formed fixedly action of gravity head of liquid level water level between the interior immersion dynamic film component top liquid level of reaction unit and the water outlet.
Embodiment
Further specify by reference to the accompanying drawings the present invention below by embodiment.
Embodiment 1
Town sewage is processed the Dynamic Membrane reaction unit and is added that powder sintered diatomite improves mixed liquor characteristics and as microbe carrier, MLSS concentration is 10000mg/L in the mixed solution in the present embodiment, is to carry out the flow by gravity water outlet under 4 KPa at liquid level pressure reduction.Specific implementation method is as follows:
1. adopt 200 order stainless (steel) wires as the supporting body structure of dynamic film component 4, supporting body structure adopts tubular type, and tubular dynamic membrane assembly 4 fixedly is immersed in the dynamic membrane bioreactor 1.
2. during the Dynamic Membrane precoating, begin to control intake pump 2 by the time relay 7 and do not intake, supporter begins water outlet under the vacuum pump suction function, and the precoating effluent recycling is to dynamic membrane bioreactor 1.The afterwards time relay 7 controls begin water inlet, and mixed solution gradually supported net is held back the formation Dynamic Membrane, and through behind the 30min, the Dynamic Membrane precoating is finished.
3. after the Dynamic Membrane precoating finishes, enter the Dynamic Membrane gravity filtration water outlet stage by the pipeline valve switching.Fixedly under the gravity head effect, realize Dynamic Membrane gravity flow water outlet at 4 KPa.Flux when beginning precoating at first up to 2610 L/m
2H is through decaying to 930 L/m after the 30min precoating
2H, through the 28h operation, flux can be stabilized in 65 L/m
2H, afterwards can steady running to 120h, and effluent quality is excellent.
4. work as flux and begin to be lower than 65 L/m
2During h, need to carry out back flushing to Dynamic Membrane, adopt Air Reverse flushing 2min, but intake pressure 20 kPa when time Dynamic Membrane mud cake comes off fully.
Embodiment 2
Town sewage is processed the Dynamic Membrane reaction unit and is added that powder sintered diatomite improves mixed liquor characteristics and as microbe carrier, MLSS concentration is 10000mg/L in the mixed solution in the present embodiment, is to carry out the flow by gravity water outlet under 2 KPa at liquid level pressure reduction.Specific implementation method is as follows:
1. adopt 200 order stainless (steel) wires as the supporting body structure of dynamic film component 4, supporting body structure adopts tubular type, and the tubular dynamic membrane assembly fixedly is immersed in the reaction unit.
2. during the Dynamic Membrane precoating, begin to control intake pump 2 by the time relay 7 and do not intake, supporter begins water outlet under the vacuum pump suction function, and the precoating effluent recycling is to dynamic membrane bioreactor 1.The afterwards time relay 7 controls begin water inlet, and mixed solution gradually supported net is held back the formation Dynamic Membrane, and through behind the 30min, the Dynamic Membrane precoating is finished.
3. after the Dynamic Membrane precoating finishes, enter the Dynamic Membrane gravity filtration water outlet stage by the pipeline valve switching.Fixedly under the gravity head effect, realize Dynamic Membrane gravity flow water outlet at 2 KPa.Flux when beginning precoating at first up to 1440 L/m
2H is through decaying to 485 L/m after the 30min precoating
2H, through the 48h operation, flux can be stabilized in 58 L/m
2H, afterwards can steady running to 120h, and effluent quality is excellent.
4. work as flux and begin to be lower than 58 L/m
2During h, need to carry out back flushing to native Dynamic Membrane, adopt Air Reverse flushing 2min, but intake pressure 20 kPa when time Dynamic Membrane mud cake comes off fully.
Embodiment 3
Town sewage is processed the Dynamic Membrane reaction unit and is added that Powdered Activated Carbon improves mixed liquor characteristics and as microbe carrier, MLSS concentration is 12000mg/L in the mixed solution in the present embodiment, is to carry out the flow by gravity water outlet under 4 KPa at liquid level pressure reduction.Specific implementation method is as follows:
1. adopt 200 order stainless (steel) wires as dynamic film component 4, supporting body structure adopts tubular type, and the tubular dynamic membrane assembly fixedly is immersed in the reaction unit.
2. during the Dynamic Membrane precoating, begin to control intake pump by the time relay 7 and do not intake, supporter begins water outlet under the vacuum pump suction function, and the precoating water outlet is by vacuum pump back flow reaction apparatus.Afterwards time relay control begins water inlet, and mixed solution gradually supported net is held back the formation Dynamic Membrane, and through behind the 30min, the Dynamic Membrane precoating is finished substantially.
3. after the Dynamic Membrane precoating finishes, enter the Dynamic Membrane gravity filtration water outlet stage by the pipeline valve switching.Fixedly under the gravity head effect, realize diatomite Dynamic Membrane gravity flow water outlet at 4 KPa.Flux when beginning precoating at first up to 450 L/m
2H is through decaying to 112.5 L/m after the 30min precoating
2H, through the 32h operation, flux can be stabilized in 22.5 L/m
2H, afterwards can steady running to 120h, and effluent quality is excellent.
4. work as flux and begin to be lower than 22.5 L/m
2During h, need to carry out back flushing to Dynamic Membrane, adopt Air Reverse flushing 2min, but intake pressure 20 kPa when time Dynamic Membrane mud cake comes off fully.
Embodiment 4
Town sewage is processed the Dynamic Membrane reaction unit and is added that Powdered Activated Carbon improves mixed liquor characteristics and as microbe carrier, MLSS concentration is 12000mg/L in the mixed solution in the present embodiment, is to carry out the flow by gravity water outlet under 2 KPa at liquid level pressure reduction.Specific implementation method is as follows:
1. adopt 200 order stainless (steel) wires as dynamic film component 4, supporting body structure adopts tubular type, and the tubular dynamic membrane assembly fixedly is immersed in the reaction unit.
2. during the Dynamic Membrane precoating, begin to control intake pump by the time relay 7 and do not intake, supporter begins water outlet under the vacuum pump suction function, and the precoating effluent recycling is to reaction unit.Afterwards time relay control begins water inlet, and mixed solution gradually supported net is held back the formation Dynamic Membrane, and through behind the 30min, the Dynamic Membrane precoating is finished.
3. after the Dynamic Membrane precoating finishes, enter the Dynamic Membrane gravity filtration water outlet stage by the pipeline valve switching.Fixedly under the gravity head effect, realize diatomite Dynamic Membrane gravity flow water outlet at 2 KPa.Flux when beginning precoating at first up to 315 L/m
2H is through decaying to 64.7 L/m after the 30min precoating
2H, through the 69h operation, flux can be stabilized in 15.2 L/m
2H, afterwards can steady running to 120h, and effluent quality is excellent.
4. work as flux and begin to be lower than 15.2 L/m
2During h, need to carry out back flushing to the biological diatomite Dynamic Membrane, adopt Air Reverse flushing 2min, but intake pressure 20 kPa when time Dynamic Membrane mud cake comes off fully.
Claims (3)
1. one kind is applicable to sanitary sewage disposal Dynamic Membrane gravity flow water outlet solid-liquid separating method, it is characterized in that the unloading phase that described method being divided into biological reinforced powder and adding first spontaneous the cultivation and biological reinforced powder mixed solution is cultivated device stable operation stage after the maturation; All comprise the precoating of Dynamic Membrane gravity in two stages, Dynamic Membrane gravity filtration water outlet and Dynamic Membrane Air Reverse flushing three phases, adopt biological reinforced powder granule to form Dynamic Membrane on the dynamic film component surface and carry out solid-liquid separation, described dynamic film component immersion is installed in the dynamic membrane bioreactor, gas blower by aeration tube to dynamic membrane bioreactor bottom aeration, aeration tube is positioned at the dynamic film component below, stirrer inserts in the dynamic membrane bioreactor, intake pump is connected dynamic membrane bioreactor top one end water-in by pipeline with valve, and by time relay control water intake mode, water-in is higher than liquid level in the dynamic membrane bioreactor, and the liquid level water level in the dynamic membrane bioreactor between immersion dynamic film component top liquid level and the water outlet is poor to form fixedly the water outlet of flowing automatically of action of gravity head driving Dynamic Membrane; Concrete steps are as follows:
(1) unloading phase that biological reinforced powder adding spontaneous cultivation first
Be that the municipal wastewater treatment plant active sludge of 4900-5100mg/L adds powder granule and improves the active sludge intermixture characteristic to the MLSS concentration that is arranged in dynamic membrane bioreactor, and as microbe carrier, adopt the spontaneous culture method of microorganism to cultivate biological reinforced powder granule; Powder granule adds first day, in dynamic membrane bioreactor, once add the 5000mg/L powder granule, water inlet, effluent adopting Continuous Flow operation scheme in this stage, dissolved oxygen concentration is 2-3mg/L in the control dynamic membrane bioreactor, hydraulic detention time 8-10 hour; Filter water outlet by active sludge and the not cultured powder granule that begins to add in dynamic film component surface formation Dynamic Membrane, finish the precoating process of dynamic film component; Through 10-15 days cultivation domestication, the MLSS concentration in the dynamic membrane bioreactor maintained 10000-12000 mg/L, and biological reinforced powder mixed solution forms; Afterwards, device enters stable operation stage; In the unloading phase that whole biological reinforced powder adds spontaneous cultivation first, Dynamic Membrane continuous effluent operational process comprises the precoating of Dynamic Membrane gravity, Dynamic Membrane gravity filtration water outlet and the flushing of Dynamic Membrane Air Reverse; Powder granule is 10-35 micron powder burned diatomite or 40-80 micron Powdered Activated Carbon;
(2) the Dynamic Membrane stable operation stage after the biological reinforced powder mixed solution cultivation maturation
The Continuous Flow operation scheme is all adopted in water inlet, water outlet, water inlet is degraded by the biological reinforced powder mixed solution of intake pump elder generation in reaction unit, the device dissolved oxygen concentration is 0.5-1.0mg/L, and sludge age is controlled at 28-32d, calculates the powder granule weight that needs replenish according to material balance; Biological reinforced powder Dynamic Membrane operational process comprises the precoating of Dynamic Membrane gravity, Dynamic Membrane gravity filtration water outlet and the flushing of Dynamic Membrane Air Reverse in this stage;
Wherein: the unloading phase that biological reinforced powder adding spontaneous cultivate first and the biological reinforced powder mixed solution Dynamic Membrane stable operation stage Dynamic Membrane solid-liquid separation of cultivating after the maturation include the precoating of Dynamic Membrane gravity, Dynamic Membrane gravity filtration water outlet and the flushing of Dynamic Membrane Air Reverse, concrete operations are as follows:
1) Dynamic Membrane gravity precoating
During the Dynamic Membrane precoating, dynamic film component begins water outlet under the vacuum pump suction function, and dynamic film component continues water outlet under fixedly the action of gravity head drives afterwards; The unloading phase that biological reinforced powder adding spontaneous cultivation first: by cultured biological reinforced powder mixed solution is not in dynamic film component surface formation Dynamic Membrane fully, the precoating time is 15-20min; Biological reinforced powder mixed solution is cultivated the Dynamic Membrane stable operation stage after the maturation: biological reinforced powder mixed solution gradually supported net is held back the formation Dynamic Membrane, and the Dynamic Membrane precoating is finished and continued 15-20min;
2) Dynamic Membrane gravity filtration water outlet
After the Dynamic Membrane precoating finishes, switch by pipeline valve, enter the Dynamic Membrane gravity filtration water outlet stage, liquid level water level in reaction unit between immersion dynamic film component top liquid level and the water outlet is poor to be formed under fixedly the action of gravity head drives, and guarantees that the biological reinforced powder Dynamic Membrane that forms can the Self-flow filtering water outlet; Because adding the difference of the different dynamic film component structures with adopting of powder granule, flux has difference during Dynamic Membrane gravity filtration gravity flow water outlet, and the unit surface Membrane Filtration Flux of general control dynamic film component is stabilized in 20L/m
2H-60L/m
2More than the h, continuous operating time surpasses more than the 120h;
In the dynamic membrane filtering process, the cross-flow on Dynamic Membrane surface is formed by supporter bottom aeration mode, also controls simultaneously the growth of Dynamic Membrane thickness for the mixed solution oxygenation; Gas-water ratio determines according to calculation of oxygen demand, minimumly is not less than 1: 1;
3) Dynamic Membrane Air Reverse flushing
When Dynamic Membrane gravity filtration effluent flux drops to preset value, when namely adding powder sintered diatomite particle: 40L/m
2H-60L/m
2H; When adding the Powdered Activated Carbon particle: 15L/m
2H-30L/m
2H needs Dynamic Membrane is carried out back flushing, adopts Air Reverse flushing time 1 min-2 min, intake pressure 9.8-49 kPa, and Dynamic Membrane is come off fully; Dynamic film component does not need regular matting; Control and the control of operation whole-course automation.
2. method according to claim 1 is characterized in that dynamic film component adopts 180-200 order stainless (steel) wire or nylon wire, and supporting body structure adopts flat or tubular type.
3. method according to claim 1 is characterized in that described action of gravity head height is 0.2-0.4 rice.
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