CN101376553A - Method for processing low temperature sewerage using low-intensity ultrasonic strengthened membrane bioreactor - Google Patents

Method for processing low temperature sewerage using low-intensity ultrasonic strengthened membrane bioreactor Download PDF

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Publication number
CN101376553A
CN101376553A CNA2008101372190A CN200810137219A CN101376553A CN 101376553 A CN101376553 A CN 101376553A CN A2008101372190 A CNA2008101372190 A CN A2008101372190A CN 200810137219 A CN200810137219 A CN 200810137219A CN 101376553 A CN101376553 A CN 101376553A
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low
membrane
sewage
temperature
pond
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CNA2008101372190A
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王秀蘅
杜彦武
刘娇
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Harbin Institute of Technology
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Harbin Institute of Technology
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Abstract

The invention relates to a method for treating low-temperature sewage by using a low-intensity ultrasound-enhanced membrane bioreactor, and belongs to a treatment method of low-temperature municipal sewage. The method can effectively solve the problems in the prior art of complex process, high treatment cost, large energy consumption and poor denitrification effect. The method comprises the following steps: membrane assemblies (4) are suspended in a membrane pond (3), an aeration device (6) is arranged at the bottom of the membrane pond (3) to complete the oxygenation and aeration of the low-temperature sewage inside the membrane pond (3), and the low-temperature sewage inside the membrane pond (3) is exposed to the low-intensity ultrasonic irradiation; the ultrasonic transducers (5) of a low-intensity ultrasound generator is arranged on frames (4-2) on both sides of the membrane assembly (4-1); the purified sewage is sucked under negative pressure by the membrane assemblies and the discharge is controlled by an intelligent control discharge system (7), and the concentrated sludge is returned to an anaerobic pond (1). The invention has the advantages of simple process, high stability, low energy consumption, high efficiency and good denitrification effect.

Description

Utilize low-intensity ultrasonic strengthened membrane bioreactor to handle the method for low-temperature sewage
Technical field
The present invention relates to a kind of low temperature municipal sewage treatment method.
Background technology
Cold district sewage autumn and winter water temperature is lower, and the growth and breeding of active sludge is subjected to the influence of water temperature.In general, the subject matter of the Wastewater Treated by Activated Sludge Process of low-temperature sewage existence has following several respects: one, microorganism active weakens, and system reduces organic clearance; Two, sludge concentration is lower, must increase the mud quantity of reflux, and this can increase energy consumption and working cost; Three, activated sludge settling property reduces, and sludge bulking easily takes place, and causes effluent quality to worsen; Four, the denitrogenation dephosphorizing ability is lower.Membrane bioreactor is having certain advantage aspect the processing low temperature municipal effluent.Because sludge concentration height in the effect of damming of film, reactor, sludge age is longer, and low temperature is little to the influence of sludge settling property, and removal effect of organic matter is stable.But the film during low temperature in the membrane bioreactor pollutes aggravation, and microorganism active is low, the denitrification effect difference is still the problem that faces.As publication number be CN101125723, open day be February 20 in 2008 day, be called " a kind of low-temperature sewage treatment method " described application for a patent for invention.
When effluent of municipal sewage plant is introduced the less river of dilution capacity as purposes such as townscape water and general reuse waters, carry out the A standard of primary standard, i.e. COD<50mg/L, BOD 5<10mg/L, SS<10mg/L, TN<15mg/L, NH 4-N<5mg/L (8mg/L when water temperature is lower than 12 ℃), TP<0.5mg/L.China the Northeast winter climate severe cold, winter, average sewage temperature generally was lower than 10 ℃, minimumly reached 5 ℃.Technology treatment effects under cold condition such as existing A/O, CASS are not good, adopt methods such as increasing mud quantity of reflux, prolongation hydraulic detention time to improve effluent quality in actual engineering.These measures can make the construction investment of Sewage Plant and working cost improve greatly undoubtedly, have run counter to the environmental protection policy of " energy-saving and emission-reduction ".And even take above-mentioned measure, ammonia nitrogen and total nitrogen also are difficult to reach standard, and the technology that exploitation has better denitrification effect is imperative.
Mostly China is that in the method for the technology employing of biological sewage treatment high-strength ultrasonic is used for mud decrement with ultrasonic applications at present.The enhanced sewage treatment effect is divided into two classes, and a class is for trade effluent, utilizes ultrasonic pretreatment, enters biological treatment device after the macromolecule organic decomposition with difficult degradation.The another kind of municipal effluent that is used for adopts conventional activated sludge method or SBR technology, the external-placed type supersonic radiation devices.Method is: mud is carried out supersound process with taking-ups such as pumps in reaction unit, the mud after the radiotreatment is turned back in the biological sewage treatment facility again; The retort that maybe will be provided with ultrasonic generator is connected on the activity sludge reflux pipeline of secondary sedimentation basins, the mud structure deteriorate that utilizes high-strength ultrasonic to produce discharges solvability carbon source, nitrogen etc., or hot localised points produces dissolving and deactivation, reach the purpose and the reinforcement sludge activity of sludge crushing decrement, it is higher to consume ultrasonic energy.
Summary of the invention
The present invention exists in order to solve existing low-temperature sewage treatment method that complex process, processing cost height, energy consumption are big, ammonia nitrogen and total nitrogen are difficult to the standard that reaches and the relatively poor problem of denitrification effect, and then a kind of method of utilizing low-intensity ultrasonic strengthened membrane bioreactor to handle low-temperature sewage is provided.
The technical scheme that the present invention solves the problems of the technologies described above employing is: the method for the invention is to realize according to following steps: step 1, flow into the anaerobic pond and the Aerobic Pond of membrane bioreactor via the effusive low-temperature sewage of ultra-fine grid; Step 2, the low-temperature sewage after step 1 is handled flow into the membrane cisterna of membrane bioreactor, and the lifting membrane pore size is 0.1~0.2 micron a membrane module in membrane cisterna, and the packing density of film is 1.5~2.0m 2Membrane area/m 3Handle the water yield, sludge concentration 8000-15000mg/L in the membrane cisterna, the bottom of membrane cisterna is provided with aerating apparatus the low-temperature sewage in the membrane cisterna is carried out oxygenic aeration, step 3, utilize low-intensity ultrasonic that the low-temperature sewage in the membrane cisterna is carried out irradiation 15~20min, the operational factors of described low-intensity ultrasonic is frequency 20-28kHz, power density 0.13-0.27W/L; Ultrasonic transducer on the low intensity ultrasound wave generating device is arranged on the framework of diaphragm group both sides; Sewage after step 4, the purification is gone out by negative pressure-pumping by membrane module and by the water outlet of intelligent control outlet system, the mud after concentrating is back in the anaerobic pond.
The present invention has following beneficial effect:
The present invention has that flow process is simple, effect stability, low-consumption high-efficiency and the good advantage of denitrification effect.The inventive method joins together to give full play to low-intensity ultrasonic and membrane bioreactor advantage separately with bioprocess technology, physical technology.Wherein integral type film biological reactor is removed organic pollutant and nitrogen, phosphorus as the main body of low-temperature sewage processing.Because membrane bioreactor can be held very high sludge quantity, does not also need to consider the influence of the settling property of mud to solid-liquid separation; Sludge age is long, and the growth of nitrobacteria when being suitable for low temperature realizes synchronous nitration and denitrification; Floor space is little, and anti impulsion load.
Ultrasonic transducer is set in membrane bioreactor following effect is arranged: make ultrasonic transducer send low-intensity ultrasonic, the cavatition that low-intensity ultrasonic produces can make the microorganism cells membrane permeability change, strengthen synthetic, the secretion of desmo enzyme, quicken cell metabolism, improve microorganism active.Producing facilitated water, mud and gas three-phase mixes and biological mass transfer.In ultrasonic field, the thread fungus volume is big, mycelia is fragile, it is many to absorb energy, will at first be cut off, and eliminates sludge bulking, alleviates mud viscosity, and the film when alleviating low temperature pollutes.Membrane bioreactor degradation of organic substances and nitric efficiency when fundamentally improving low temperature.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of membrane bioreactor of the present invention, and Fig. 2 is that the position of ultrasonic transducer and membrane module concerns synoptic diagram.
Embodiment
Embodiment one: shown in Fig. 1~2, the method that present embodiment is described utilizes low-intensity ultrasonic strengthened membrane bioreactor to handle low-temperature sewage realizes according to following steps: step 1, via the anaerobic pond 1 and the Aerobic Pond 2 of the effusive low-temperature sewage inflow of ultra-fine grid membrane bioreactor; Step 2, the low-temperature sewage after step 1 is handled flow into the membrane cisterna 3 of membrane bioreactor, and the lifting membrane pore size is (immersion) membrane module 4 of 0.1~0.2 micron in membrane cisterna 3, and the packing density of film is 1.5~2.0m2 membrane area/m 3Handle the water yield, sludge concentration 8000-15000mg/L in the membrane cisterna, the low-temperature sewage that the bottom of membrane cisterna 3 is provided with in 6 pairs of membrane cisternas of aerating apparatus 3 carries out oxygenic aeration, step 3, utilize low-intensity ultrasonic that the low-temperature sewages in the membrane cisterna 3 are carried out irradiation 15~20min, the operational factors of described low-intensity ultrasonic is frequency 20-28kHz, power density 0.13-0.27W/L; Ultrasonic transducer 5 on the low intensity ultrasound wave generating device is arranged on the framework 4-2 of diaphragm group 4-1 both sides; Sewage after step 4, the purification is gone out by negative pressure-pumping by membrane module and by 7 water outlets of intelligent control outlet system, the mud after concentrating is back in the anaerobic pond 1.Be the start time of low intensity ultrasound wave generating device: winter low temperature period (when water temperature is lower than 12 ℃), spring and autumn abrupt change of climate period and resist impact load that water quantity and quality changes above 20% o'clock.The described membrane bioreactor of present embodiment comprises anaerobic pond 1, Aerobic Pond 2, membrane cisterna 3, membrane module 4, low intensity ultrasound wave generating device, aerating apparatus 6, intelligent control outlet system 7, membrane module 4 is made up of diaphragm group 4-1 and framework 4-2, and diaphragm group 4-1 is packed in the framework 4-2; Oxygen pond 1, Aerobic Pond 2 and membrane cisterna 3 set gradually and are communicated with, be provided with plug-flow device under water in the anaerobic pond 1, be provided with aerating apparatus 6 in Aerobic Pond 2 and the membrane cisterna 3, be lifted with membrane module 4 in the membrane cisterna 3, ultrasonic transducer 5 on the low intensity ultrasound wave generating device is arranged on the framework 4-2 of diaphragm group 4-1 both sides, and intelligent control outlet system 7 is arranged on the membrane cisterna 3.
Membrane module 4: membrane cisterna 3 is low-intensity ultrasonic strengthened membrane biological reaction pond.Diaphragm group 4-1 is polyvinylidene difluoride (PVDF) (PVDF) or polyethylene (PE) hollow fiber microfiltration membrane, and 0.1~0.2 micron of membrane pore size, the packing density of film are 1.5~2.0m 2Membrane area/m 3Handle the water yield.
Aerating apparatus 6: the aerating apparatus of macropore or mesopore is installed in the bottom of membrane cisterna, is produced the surface that tubular fibre is washed away in turbulent fluctuation, make the surface of particle detachment film, reduce the frequency of matting film piece.The concentration of dissolved oxygen is controlled between 0.5~1.5mg/L, finishes synchronous nitration and denitrification, the strengthened denitrification effect.
The low intensity ultrasound wave generating device: ultrasonic wave is selected low frequency/small Power for use.The low-intensity ultrasonic operational factors is chosen as: frequency 20-28kHz, power density 0.13-0.27W/L (L is the volume of membrane cisterna 3), irradiation time 15-20min.According to sewage hydraulic detention time difference, irradiation time interval 8 or 12h.According to the composition of raw waste water, when mainly considering the strengthened denitrification effect, power density is got low value 0.13-0.20W/L, when considering to strengthen the organic matter removal effect, gets high value 0.20-0.27W/L.The ultrasonic generator main frame is external, and ultrasonic transducer places the membrane module support side parallel with diaphragm in pond, is fixed on the cross bar, and the ultrasonic wave wafer is parallel to diaphragm, is connected with producer by lead.Single transducer power can be selected 35W, 50W or 60W for use.Transverter is selected trumpet type composite oscillator structure for use, and wafer and shell need corrosion-resistant.Membrane module with aquifer yield 10t/d (ton/sky) is an example, 4 of the transverters of need installation 50W, two of every sides; The membrane module of 30t/d then needs 10 of the transverters of 60W, evenly arranges 5 respectively two sides.Transverter should be not less than 0.15 meter apart from the housing distance, as shown in Figure 2.
Embodiment two: the volume ratio of the described anaerobic pond 1 of present embodiment, Aerobic Pond 2, membrane cisterna 3 is 1:5:2.So be provided with, remove the best results of organism, nitrogen and phosphorus synchronously.Other step is identical with embodiment one.
Embodiment three: shown in Fig. 1~2, present embodiment is irradiation time interval 8 or 12h in step 3.Other step is identical with embodiment one.
Embodiment four: adopt the inventive method processing city process sewage flow process to be: the ultra-fine grid of water inlet → pumping plant → fine fack → settling pit → 0.5mm (the grid spacing is 0.5mm) → biological reaction tank → water outlet.Flowing into membrane bioreactor via the effusive low-temperature sewage of the ultra-fine grid of 0.5mm enters in the anaerobic pond 1 and with the effusive mud of membrane cisterna and mixes, organism in the anaerobic pond 1 in the sewage under anaerobic part is decomposed into VFA (voltaile fatty acid), the organonitrogen ammonification, polyP bacteria anaerobic phosphorus release in the while active sludge, according to former water phosphorus content, the small part mixed solution is drawn out of and is sent to chemical phosphorus removal system in the anaerobic pond 1.Mixed solution flows into Aerobic Pond 2 then, finishes organic matter degradation and ammonia nitrogen is nitrated, enters membrane cisterna at last, finishes the target that synchronous nitration and denitrification reaches biological denitrificaion.By the intelligent control outlet system, purify back sewage and gone out by negative pressure-pumping by membrane module, the mud after concentrating is back to anaerobic pond.
With the sanitary sewage as table 1 is process object, in the time of 7 ℃, under this ultrasonic wave parameter role, it is about 22% that COD biological removal rate improves per-cent, TN (total nitrogen) biological removal rate raising per-cent was about 23% after ultrasonic irradiation finished 3h, and to load ultrasonic energy consumption also less this moment, realized the economy of this technology.
Under the ultrasonic wave booster action, continuously the membrane bioreactor of operation has been realized the processing up to standard to the low temperature municipal effluent during for 3.3h at HRT (hydraulic detention time).Can make COD biological removal rate improve 10%~15% after ultrasonic wave is set, total clearance improves 7%~13%; TN biological removal rate improves about 14%~20%, and total clearance improves 13%~16%.Under the intensified by ultrasonic wave effect, the COD of membrane biological reaction apparatus, NH 3-N goes out water concentration and is reduced to 10~20mg/L, 5.8~7.9mg/L respectively.
Low-intensity ultrasonic irradiation has certain effect to alleviating the cryogenic film pollution, can make the film cleaning interval prolong 2 days, extends to 19 days from 17 days.
Table 1 sanitary sewage water quality cartogram

Claims (3)

1, a kind of method of utilizing low-intensity ultrasonic strengthened membrane bioreactor to handle low-temperature sewage, it is characterized in that: described method realizes according to following steps: step 1, via the anaerobic pond (1) and the Aerobic Pond (2) of the effusive low-temperature sewage inflow of ultra-fine grid membrane bioreactor; Step 2, the low-temperature sewage after step 1 is handled flow into the membrane cisterna (3) of membrane bioreactor, and the lifting membrane pore size is 0.1~0.2 micron a membrane module (4) in membrane cisterna (3), and the packing density of film is 1.5~2.0m 2Membrane area/m 3Handle the water yield, sludge concentration 8000-15000mg/L in the membrane cisterna, the bottom of membrane cisterna (3) is provided with aerating apparatus (6) low-temperature sewage in the membrane cisterna (3) is carried out oxygenic aeration, step 3, utilize low-intensity ultrasonic that the low-temperature sewage in the membrane cisterna (3) is carried out irradiation 15~20min, the operational factors of described low-intensity ultrasonic is frequency 20-28kHz, power density 0.13-0.27W/L; Ultrasonic transducer on the low intensity ultrasound wave generating device (5) is arranged on the framework (4-2) of diaphragm group (4-1) both sides; Sewage after step 4, the purification is gone out by negative pressure-pumping by membrane module and by intelligent control outlet system (7) water outlet, the mud after concentrating is back in the anaerobic pond (1).
2, the method for utilizing low-intensity ultrasonic strengthened membrane bioreactor to handle low-temperature sewage according to claim 1, it is characterized in that: the volume ratio of described anaerobic pond (1), Aerobic Pond (2), membrane cisterna (3) is 1:5:2.
3, the method for utilizing low-intensity ultrasonic strengthened membrane bioreactor to handle low-temperature sewage according to claim 1 is characterized in that: irradiation time interval 8 or 12h in step 3.
CNA2008101372190A 2008-09-27 2008-09-27 Method for processing low temperature sewerage using low-intensity ultrasonic strengthened membrane bioreactor Pending CN101376553A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101781051A (en) * 2010-03-16 2010-07-21 哈尔滨工业大学 Aeration and low frequency ultrasonic wave reinforced film coagulation reaction separating device and method for producing drinking water thereby
CN101851049A (en) * 2010-06-02 2010-10-06 清华大学 Online ultrasonic anaerobic membrane biological reaction system used for sludge digestion and operation method thereof
CN102139990A (en) * 2011-01-21 2011-08-03 樊利华 Ultrasonic combined waste water treatment process and system of refuse leachate
CN102145962A (en) * 2011-02-24 2011-08-10 大连理工大学 Ultrasonic coupled membrane bioreactor for treating difficultly-degradable organic waste water
CN104556361A (en) * 2013-10-11 2015-04-29 中国石油化工股份有限公司 Low-intensity ultrasonic synergistic aeration device
CN104628136A (en) * 2015-02-15 2015-05-20 华东理工大学 Biological enhanced nitrogen removal treatment method of degradation-resistant high-concentration organic industrial wastewater
CN104724823A (en) * 2013-12-20 2015-06-24 清华大学 Sewage treatment device and system
CN105923749A (en) * 2015-09-01 2016-09-07 江西金达莱环保股份有限公司 Gasification dephosphorization sewage treatment method and system
CN105948246A (en) * 2015-09-01 2016-09-21 江西金达莱环保股份有限公司 Non-zoned membrane biological sewage treatment method and non-zoned membrane biological sewage treatment system

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101781051A (en) * 2010-03-16 2010-07-21 哈尔滨工业大学 Aeration and low frequency ultrasonic wave reinforced film coagulation reaction separating device and method for producing drinking water thereby
CN101851049A (en) * 2010-06-02 2010-10-06 清华大学 Online ultrasonic anaerobic membrane biological reaction system used for sludge digestion and operation method thereof
CN101851049B (en) * 2010-06-02 2012-11-14 清华大学 Online ultrasonic anaerobic membrane biological reaction system used for sludge digestion and operation method thereof
CN102139990A (en) * 2011-01-21 2011-08-03 樊利华 Ultrasonic combined waste water treatment process and system of refuse leachate
CN102139990B (en) * 2011-01-21 2012-10-17 樊利华 Ultrasonic combined waste water treatment process and system of refuse leachate
CN102145962A (en) * 2011-02-24 2011-08-10 大连理工大学 Ultrasonic coupled membrane bioreactor for treating difficultly-degradable organic waste water
CN104556361A (en) * 2013-10-11 2015-04-29 中国石油化工股份有限公司 Low-intensity ultrasonic synergistic aeration device
CN104724823A (en) * 2013-12-20 2015-06-24 清华大学 Sewage treatment device and system
CN104628136A (en) * 2015-02-15 2015-05-20 华东理工大学 Biological enhanced nitrogen removal treatment method of degradation-resistant high-concentration organic industrial wastewater
CN104628136B (en) * 2015-02-15 2017-04-19 华东理工大学 Biological enhanced nitrogen removal treatment method of degradation-resistant high-concentration organic industrial wastewater
CN105923749A (en) * 2015-09-01 2016-09-07 江西金达莱环保股份有限公司 Gasification dephosphorization sewage treatment method and system
CN105948246A (en) * 2015-09-01 2016-09-21 江西金达莱环保股份有限公司 Non-zoned membrane biological sewage treatment method and non-zoned membrane biological sewage treatment system

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