CN102557352B - Method for treating organic wastewater through dynamic membrane anaerobic-aerobic integration - Google Patents
Method for treating organic wastewater through dynamic membrane anaerobic-aerobic integration Download PDFInfo
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Abstract
The invention discloses a method for treating organic wastewater through dynamic membrane anaerobic-aerobic integration, and relates to a wastewater treatment method. The original wastewater enters a first-stage aerobic tank in which a first-stage perforated aeration pipe is arranged, an external air compressor is used for blast aeration, the aeration amount is controlled by a rotameter, and sludge is discharged from the bottom of the first-stage aerobic tank; the wastewater flowing through the first-stage aerobic tank flows into a first-stage anaerobic tank through a first-stage dynamic membrane, a first-stage stirrer device is arranged in the first-stage anaerobic tank, and sludge is discharged from the bottom of the first-stage anaerobic tank; the wastewater flowing through the first-stage anaerobic tank flows into a second-stage aerobic tank through a second-stage dynamic membrane, a second-stage perforated aeration pipe is arranged in the second-stage aerobic tank, an air compressor is used for blast aeration and sludge is discharged from the bottom of the second-stage aerobic tank; and the wastewater flowing through the second-stage aerobic tank flows into a second-stage anaerobic tank through a third-stage dynamic membrane, a second-stage stirrer device is arranged in the second-stage anaerobic tank, sludge is discharged from the bottom of the second-stage anaerobic tank, and the wastewater reaching the standard is discharged through a water outlet of the second-stage anaerobic tank.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, especially relate to a kind of method for the treatment of organic wastewater through dynamic membrane anaerobic-aerobic integration.
Background technology
Along with the fast development of industrial technology, the high concentrated organic wastewater of the industries such as printing and dyeing, chemical industry, food, papermaking becomes sewage treatment area and needs one of difficult problem of solution badly.At present, Technologies for Organic Wastewater Treatment mainly contains Physical, chemical method and biological process both at home and abroad, and wherein most widely used general, technical dominant method is biological treatment.In recent years, biological wastewater treatment technology turns to the anaerobic-aerobic combination treatment method by the single anaerobic process of tradition, aerobic method, as anaerobic-aerobic method (A/O method), anaerobic-anoxic-oxic method (A/A/O method) etc.Anaerobism, aerobic combination technique by adopting multistage multistage, complete the biological treatment to organic waste water.And anerobe is to the requirement for environmental conditions harshness, and to the bad adaptability of environment, when in water inlet, organic loading was too high, the acidication product produced accumulation, caused water body basicity to reduce, and the anerobe activity also is suppressed.Simultaneously, the thread fungus amount reproduction, sludge loss, effluent quality worsens, and has increased the weight of the burden of follow-up aerobic treatment.Patent publication No. is that the Chinese invention patent application of CN1422817 has proposed the anaerobism-oxygen-aerobic integratedization sewage water treatment method of holding concurrently, by three conversion zones of poison are set in single reaction equipment: anaerobic zone, aerobic area, aerobic zone, form three kinds of living things systems, that utilizes aerobic zone realizes Hydraulic Circulation and sludge circulation to power power, reduces acidifying in anaerobic pond.The method equipment used cost of investment is high, and in operating process, parameter control difficulty is large.Patent publication No. is that the Chinese invention patent application of CN1429780 has proposed a kind of sewage treatment technique, change traditional large-scale aeration tank into a plurality of small-sized reaction tanks, change the sewage disposal path, processing by multistage multistage, reach sewage drainage standard, but this process engineering investment is large, and running cost is higher.Patent publication No. is that the Chinese invention patent application of CN1271692A has proposed a kind of process for treating high-concentration sewage, by the sewage backflow tank is set after anaerobic reation pool, in return tank, part of contaminated water enters the aerobe selector switch and aerobic degradation is carried out in aeration tank, another part is back in anaerobic pond, although but the method has improved the basicity of water in the anaerobic pond, the problems such as but have the excess sludge maximum, energy consumption is high, and floor space is large.
Membrane Bio-reactor Technology (MBR) adopts membrane separation technique to combine with biologic treating technique, therefore has following spy
1) sludge concentration high (be generally traditional technology 2 times), biochemical efficiency is high, and degradation of pollutant is fast, and effluent quality is good;
2) be conducive to long microbial growth of generation cycle, be conducive to the place to go of ammonia nitrogen and difficult degradation pollution substance;
3) mud is longer age, and the excess sludge discharge amount is less;
4) floor space is little, saves soil.The film-bioreactor technology is the new system that membrane separation technique and biological wastewater treatment technology are combined, this system is to substitute the second pond in the two stage biological treatment process with membrane separation technique, but have technical process simple, take up an area less, the characteristics such as convenient management, processing efficiency are high, water outlet direct reuse.Yet it is the major obstacle of restriction film-bioreactor widespread use in sewage disposal that film pollutes, research shows, in traditional film-bioreactor, having the adhering to of microorganism such as active sludge is to cause film to pollute, affect one of important factor of membrane flux.Therefore, improve the existence form of microorganism in film-bioreactor, alleviate that it is imperative on impact that film pollutes.Publication number is that the Chinese invention patent of CN01016185A, CN1974439A, CN01100333A adopts respectively and takes filler to show to adhere to engineering bacteria or enzyme form, or adopt the form of granule sludge to make the microorganism in film-bioreactor no longer with suspended state, exist, thereby alleviate the impact on membrane flux.Yet, utilize the mode of filling surface attached microbial to improve to exist and be unfavorable for the shortcomings such as extraordinary microbial growth, microorganism concn is low, soil removability is poor; The structure of community that utilize granule sludge to improve and have easily fragmentation of granule sludge, causes stopping up fenestra, granule sludge self formation is difficult to the shortcomings such as Artificial Control microflora stablizes.
Although above-mentioned patent has been carried out improvement and bring new ideas to biological treatment, MBR technique is applied in large-scale sewage disposal example is few.Cause the reason of this present situation to be mainly: the high cost of membrane module, the operational process power consumption is too high, cause working cost very high, suspended contaminant is trapped or is adsorbed on the film surface under the effect of pressure in the operational process of film, cause the pollution of film, the attenuation problem of effluent flux is difficult to solve.Therefore, need to research and develop novel membrane bioreactor for these shortcomings, so that it addresses the above problem on the former advantageous basis of reservation as far as possible.In common membrane filtration processes, the colloid in solution and suspended particle are trapped or are adsorbed on the film surface under the effect of filter pressure, caused the decline of membrane flux, and this phenomenon is called film and pollutes.But from the another one angle, the pollution layer on film surface has strengthened the interception capacity of film, make microfiltration membrane can hold back even small organic molecule of virus, just look like on original film, to have increased again a skim.Because this tunic forms in filtration procedure, its composition and thickness all may reach in time the variation of the conditions such as bio-reactor operation and change, therefore some investigators are referred to as Dynamic Membrane or secondary film.Correspondingly, by this bioreactor of dynamic membrane that is called.The appearance of Dynamic Membrane has solved two hang-ups of above-mentioned MBR well, because because the selection of porous counterdie and precoating paint is extensive and cheap and easy to get, makes the cost of Dynamic Membrane have very significantly and descend than traditional MBR.In addition, due to the porous counterdie, be that the flux of membrane matrix itself is just very large, precoating or spontaneous again again after the Dynamic Membrane on membrane matrix surface can also being removed in the with serious pollution situation of film, thus controlling diaphragm pollutes effectively.And other advantages such as Dynamic Membrane also has that equipment is simple, processing ease, treatment effect are better.Therefore, Dynamic membrane has caused people's research and concern widely.
Summary of the invention
The objective of the invention is for existing problems such as existing efficiency in treatment of Organic Wastewater are not high, occupation area of equipment is large, cost of investment is high, provide a kind of to the organic waste water method of the treating organic wastewater through dynamic membrane anaerobic-aerobic integration of efficient economy more.
The present invention includes following steps:
1) raw wastewater enters the 1st grade of Aerobic Pond, the 1st grade of Aerobic Pond inside, the 1st grade of boring aeration pipe is housed, and by outside air compressor blast aeration, controls aeration rate with spinner-type flowmeter, the 1st grade of Aerobic Pond bottom spoil disposal;
2) waste water after the 1st grade of Aerobic Pond processed from flowing into the 1st grade of anaerobic pond, arranges the 1st grade of whipping appts through the 1st grade of Dynamic Membrane in the 1st grade of anaerobic pond, the 1st grade of anaerobic pond bottom spoil disposal;
3) waste water after the 1st grade of anaerobic pond processed from flowing into the 2nd grade of Aerobic Pond, is equipped with 2nd grade boring aeration pipe the 2nd grade of Aerobic Pond inside through the 2nd grade of Dynamic Membrane, by the air compressor blast aeration, and the 2nd grade of Aerobic Pond bottom spoil disposal;
4) waste water after the 2nd grade of Aerobic Pond processed from flowing into the 2nd grade of anaerobic pond, arranges the 2nd grade of whipping appts through the 3rd level Dynamic Membrane in the 2nd grade of anaerobic pond, the 2nd grade of anaerobic pond bottom spoil disposal, and the processing water after up to standard is discharged by the water outlet of the 2nd grade of anaerobic pond.
In step 1) in, described the 1st grade of Aerobic Pond can be to move under 10～35 ℃ of conditions in temperature; Described aeration rate can be controlled in 0.5～5L/min, and the dissolved oxygen in the 1st grade of Aerobic Pond can be DO >=2.0mg/L.
In step 2) in, the temperature of described the 1st grade of anaerobic pond can be 15～35 ℃, and the stirring velocity of described the 1st grade of whipping appts can be 60～200r/min.
In step 3) in, described the 2nd grade of Aerobic Pond can be to move under 10～35 ℃ of conditions in temperature, and described aeration rate can be controlled in 0.5～5L/min, and the dissolved oxygen in the 2nd grade of Aerobic Pond can be DO >=2.0mg/L.
In step 4) in, the temperature of described the 2nd grade of anaerobic pond can be 15～35 ℃, and the stirring velocity of described the 2nd grade of whipping appts can be 60～150r/min.
Described the 1st boring aeration pipe and the 2nd boring aeration pipe all can adopt the core aeration first-class.
Described Dynamic Membrane can adopt industrial filter cloth film etc., and the filter cloth aperture of described industrial filter cloth film can be 10～100 μ m, and described industrial filter cloth film can be selected from least a in the long fine filter cloth film of terylene short fiber filter cloth film, terylene, polyvinyl filter cloth film, polypropylene fibre filter cloth film etc.
The present invention, according to waste water quality type, the processing water yield and organic loading, controls the water inlet flow velocity by constant flow pump, makes waste water process successively in 4 reaction tanks, water outlet rear discharge up to standard.
The effect of Dynamic Membrane and function are:
1) Dynamic Membrane has solved the expensive and film pollution difficult problem of MBR film: the cost of traditional membrane module is high, and the operational process power consumption is large, causes working cost high.Suspended contaminant is trapped or is adsorbed on the film surface under the effect of pressure in the operational process of film, causes the pollution of film.And Dynamic Membrane is extensive and cheap and easy to get by the selection of porous counterdie and precoating paint, make its cost and cost have very significantly and descend than traditional MBR.The porous counterdie is that the flux of membrane matrix itself is larger, precoating or spontaneous again again after the Dynamic Membrane on membrane matrix surface can also being removed in the with serious pollution situation of film, thus controlling diaphragm pollutes effectively.
2) by Dynamic Membrane, replace traditional membrane module, it organically combines membrane separation technique and bioprocesses, high efficiency separation effect with membrane technique replaces the second pond in traditional activated sludge process, realize mud-water separation and mud concentrated effect that traditional technology is incomparable, eliminated the impact of sludge bulking.It has also increased substantially the concentration of active sludge in the aeration tank, save the sludge reflux system, greatly extended mud age, reduced surplus sludge volume, and, by the efficient crown_interception of film to SS, organism, pathogenic bacteria and virus in waste water, greatly improved the processing effluent quality.
With the multistage multistage dirty water living creature processing technique of traditional organic waste water, compare, the present invention has that floor space is little, cost of investment is low, equipment is simple, easy to operate, high treating effect, is applicable to the processing of organic waste water.
The accompanying drawing explanation
Fig. 1 is embodiment of the present invention process flow diagram.
Embodiment
Referring to Fig. 1, the present invention includes following steps:
1) raw wastewater enters the 1st grade of Aerobic Pond 1 through water inlet A, the 1st grade of Aerobic Pond 1 inside, the 1st grade of boring aeration pipe 2 is housed, by 3 blast aerations of outside air compressor, control aeration rate, the 1st grade of Aerobic Pond 1 bottom spoil disposal (meaning with mark C) with spinner-type flowmeter 4 in Fig. 1; Described the 1st grade of Aerobic Pond 1 can be to move under 10～35 ℃ of conditions in temperature; Described aeration rate can be controlled in 0.5～5L/min, and the dissolved oxygen in the 1st grade of Aerobic Pond 1 can be DO >=2.0mg/L.
2) waste water after the 1st grade of Aerobic Pond 1 processed flows into the 1st grade of anaerobic pond 6 certainly through the 1st grade of Dynamic Membrane 5, at the 1st grade of interior 7, the 1 grades of anaerobic pond 6 bottom spoil disposals of the 1st grade of whipping appts (meaning with mark C in Fig. 1) that arrange of anaerobic pond 6; The temperature of described the 1st grade of anaerobic pond 6 can be 15～35 ℃, and the stirring velocity of described the 1st grade of whipping appts 7 can be 60～200r/min.
3) waste water after the 1st grade of anaerobic pond 6 processed flows into the 2nd grade of Aerobic Pond 9 certainly through the 2nd grade of Dynamic Membrane 8, the 2nd grade of Aerobic Pond 9 inside, the 2nd grade of boring aeration pipe 10 is housed, by air compressor 3 blast aerations, the 2nd grade of Aerobic Pond 9 bottom spoil disposals (meaning with mark C in Fig. 1); Described the 2nd grade of Aerobic Pond 9 can be to move under 10～35 ℃ of conditions in temperature, and described aeration rate can be controlled in 0.5～5L/min, and the dissolved oxygen in the 2nd grade of Aerobic Pond 9 can be DO >=2.0mg/L.
4) waste water after the 2nd grade of Aerobic Pond 9 processed flows into the 2nd grade of anaerobic pond 12 certainly through 3rd level Dynamic Membrane 11, the 2nd grade of whipping appts 13 be set the 2nd grade of anaerobic pond 12 is interior, the 2nd grade of anaerobic pond 12 bottom spoil disposals (meaning with mark C in Fig. 1), the processing water after up to standard is discharged by the water outlet B of the 2nd grade of anaerobic pond 12.The temperature of described the 2nd grade of anaerobic pond 12 can be 15～35 ℃, and the stirring velocity of described the 2nd grade of whipping appts 13 can be 60～150r/min.
Described the 1st boring aeration pipe 2 and the 2nd boring aeration pipe 10 all can adopt the core aeration first-class.
Described the 1st Dynamic Membrane the 5, the 2nd Dynamic Membrane 8 and the 3rd Dynamic Membrane 11 all can adopt industrial filter cloth film etc., the filter cloth aperture of described industrial filter cloth film can be 10～100 μ m, and described industrial filter cloth film can be selected from least a in the long fine filter cloth film of terylene short fiber filter cloth film, terylene, polyvinyl filter cloth film, polypropylene fibre filter cloth film etc.
The waste water type is sanitary sewage.Inlet COD concentration is 352mg/L, according to the water inlet organic loading, make sanitary sewage at the 1st grade of Aerobic Pond 1, the 1st grade of Dynamic Membrane 5, the 1st grade of anaerobic pond 6, the 2nd grade of Dynamic Membrane 8, the 2nd grade of Aerobic Pond 9,3rd level Dynamic Membrane 11 and the 2nd grade of anaerobic pond 12, carry out biological degradation successively, measure in different degradation times the indexs such as COD, the SS of water body, DO, pH value, temperature in each pond, wherein effluent COD concentration is 15mg/L, and the COD clearance is 95.7%.
Similar to Example 1, its difference is that inlet COD concentration is 408mg/L, according to the water inlet organic loading, make sanitary sewage at the 1st grade of Aerobic Pond 1, the 1st grade of Dynamic Membrane 5, the 1st grade of anaerobic pond 6, the 2nd grade of Dynamic Membrane 8, the 2nd grade of Aerobic Pond 9,3rd level Dynamic Membrane 11 and the 2nd grade of anaerobic pond 12, carry out biological degradation successively, measure in different degradation times the indexs such as COD, the SS of water body, DO, pH value, temperature in each pond, wherein effluent COD concentration is 22mg/L, and the COD clearance is 94.6%.
Similar to Example 1, its difference is that inlet COD concentration is 456mg/L, according to the water inlet organic loading, make sanitary sewage at the 1st grade of Aerobic Pond 1, the 1st grade of Dynamic Membrane 5, the 1st grade of anaerobic pond 6, the 2nd grade of Dynamic Membrane 8, the 2nd grade of Aerobic Pond 9,3rd level Dynamic Membrane 11 and the 2nd grade of anaerobic pond 12, carry out biological degradation successively, measure in different degradation times the indexs such as COD, the SS of water body, DO, pH value, temperature in each pond, wherein effluent COD concentration is 28mg/L, and the COD clearance is 93.8%.
Embodiment 4
Similar to Example 1, its difference is that the waste water type is dyeing waste water, inlet COD concentration is 1520mg/L, according to the water inlet organic loading, make dyeing waste water at the 1st grade of Aerobic Pond 1, the 1st grade of Dynamic Membrane 5, the 1st grade of anaerobic pond 6, the 2nd grade of Dynamic Membrane 8, the 2nd grade of Aerobic Pond 9,3rd level Dynamic Membrane 11 and the 2nd grade of anaerobic pond 12, carry out biological degradation successively, measure in different degradation times the indexs such as COD, the SS of water body, DO, pH value, temperature in each pond, wherein effluent COD concentration is 85mg/L, and the COD clearance is 94.4%.
Similar to Example 4, its difference is that inlet COD concentration is 1782mg/L, according to the water inlet organic loading, make dyeing waste water at the 1st grade of Aerobic Pond 1, the 1st grade of Dynamic Membrane 5, the 1st grade of anaerobic pond 6, the 2nd grade of Dynamic Membrane 8, the 2nd grade of Aerobic Pond 9,3rd level Dynamic Membrane 11 and the 2nd grade of anaerobic pond 12, carry out biological degradation successively, measure in different degradation times the indexs such as COD, the SS of water body, DO, pH value, temperature in each pond, wherein effluent COD concentration is 92mg/L, and the COD clearance is 94.8%.
Embodiment 6
Similar to Example 4, its difference is that inlet COD concentration is 2246mg/L, according to the water inlet organic loading, make dyeing waste water at the 1st grade of Aerobic Pond 1, the 1st grade of Dynamic Membrane 5, the 1st grade of anaerobic pond 6, the 2nd grade of Dynamic Membrane 8, the 2nd grade of Aerobic Pond 9,3rd level Dynamic Membrane 11 and the 2nd grade of anaerobic pond 12, carry out biological degradation successively, measure in different degradation times the indexs such as COD, the SS of water body, DO, pH value, temperature in each pond, wherein effluent COD concentration is 98mg/L, and the COD clearance is 95.6%.
The sanitary sewage of embodiment 1～6 and disposal effect of dyeing wastewater are in Table 1.
Table 1 sanitary sewage and disposal effect of dyeing wastewater
Claims (5)
1. the method for the treatment of organic wastewater through dynamic membrane anaerobic-aerobic integration is characterized in that comprising the following steps:
1) raw wastewater enters the 1st grade of Aerobic Pond, the 1st grade of Aerobic Pond inside, the 1st grade of boring aeration pipe is housed, and by outside air compressor blast aeration, controls aeration rate with spinner-type flowmeter, the 1st grade of Aerobic Pond bottom spoil disposal; Described the 1st grade of Aerobic Pond is to be to move under 10～35 ℃ of conditions in temperature;
2) waste water after the 1st grade of Aerobic Pond processed from flowing into the 1st grade of anaerobic pond, arranges the 1st grade of whipping appts through the 1st grade of Dynamic Membrane in the 1st grade of anaerobic pond, the 1st grade of anaerobic pond bottom spoil disposal; The temperature of described the 1st grade of anaerobic pond is 15～35 ℃; The stirring velocity of described the 1st grade of whipping appts is 60～200r/min;
3) waste water after the 1st grade of anaerobic pond processed from flowing into the 2nd grade of Aerobic Pond, is equipped with 2nd grade boring aeration pipe the 2nd grade of Aerobic Pond inside through the 2nd grade of Dynamic Membrane, by the air compressor blast aeration, and the 2nd grade of Aerobic Pond bottom spoil disposal; Described the 2nd grade of Aerobic Pond is to be to move under 10～35 ℃ of conditions in temperature;
4) waste water after the 2nd grade of Aerobic Pond processed from flowing into the 2nd grade of anaerobic pond, arranges the 2nd grade of whipping appts through the 3rd level Dynamic Membrane in the 2nd grade of anaerobic pond, the 2nd grade of anaerobic pond bottom spoil disposal, and the processing water after up to standard is discharged by the water outlet of the 2nd grade of anaerobic pond; The temperature of described the 2nd grade of anaerobic pond is 15～35 ℃, and the stirring velocity of described the 2nd grade of whipping appts is 60～150r/min;
Described the 1st grade of Dynamic Membrane, the 2nd grade of Dynamic Membrane and 3rd level Dynamic Membrane all adopt the industrial filter cloth film, and the filter cloth aperture of described industrial filter cloth film is 10～100 μ m.
2. the method for the treatment of organic wastewater through dynamic membrane anaerobic-aerobic integration as claimed in claim 1, is characterized in that in step 1), and described aeration control is at 0.5～5L/min, and the dissolved oxygen in the 1st grade of Aerobic Pond is DO >=2.0mg/L.
3. the method for the treatment of organic wastewater through dynamic membrane anaerobic-aerobic integration as claimed in claim 1, is characterized in that in step 3), and described aeration control is at 0.5～5L/min, and the dissolved oxygen in the 2nd grade of Aerobic Pond is DO >=2.0mg/L.
4. the method for the treatment of organic wastewater through dynamic membrane anaerobic-aerobic integration as claimed in claim 1, is characterized in that in step 1) and step 3), and described the 1st grade of boring aeration pipe and the 2nd grade of boring aeration pipe all adopt the core aeration head.
5. the method for the treatment of organic wastewater through dynamic membrane anaerobic-aerobic integration as claimed in claim 1, is characterized in that described industrial filter cloth film is selected from least a in terylene short fiber filter cloth film, the long fine filter cloth film of terylene, polyvinyl filter cloth film, polypropylene fibre filter cloth film.
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