CN102500228B - Method for controlling excessive accumulation of biological membranes in biological trickling filter - Google Patents
Method for controlling excessive accumulation of biological membranes in biological trickling filter Download PDFInfo
- Publication number
- CN102500228B CN102500228B CN201110336979.6A CN201110336979A CN102500228B CN 102500228 B CN102500228 B CN 102500228B CN 201110336979 A CN201110336979 A CN 201110336979A CN 102500228 B CN102500228 B CN 102500228B
- Authority
- CN
- China
- Prior art keywords
- trickling filter
- biological
- surfactant
- nutrient solution
- bio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a method for controlling excessive accumulation of biological membranes in a biological trickling filter. The biological trickling filter is inoculated by using active sludge, simultaneously volatile organic compounds are led into the biological trickling filter, a surface active agent is adopted to acclimatize microorganism in packing layers after a normal operation state is reached, the surface active agent is led in a nutrient solution supply tank of the biological trickling filter, a nutrient solution circulating pump enables mixed liquid of nutrient solution and the surface active agent to be sprayed on the surfaces of the packing layers through a sprayer, the sprayed surface active agent sequentially flows through each packing layer from top to bottom so as to moisten, disperse, lubricate and wash the biological membranes, and the biological membranes are discharged from the biological tricking filter through flow scouring so as to achieve the purpose of controlling of the excessive accumulation of the biological membranes in the packing layers. The method can economically and effectively control the excessive accumulation of the biological membranes in the packing layers of the biological trickling filter, keeps operation processes to be performed continuously, cannot interrupt the operation processes and experience a microbial activity recovery stage, can remarkably improve removal performance of organic compounds, especially hydrophobic organic compounds, and has the advantages of being low in long-term operating pressure drop, stable in performance, low in operating cost and easy and simple to operate.
Description
Technical field
The present invention is mainly concerned with while processing low-concentration organic exhaust gas with bioanalysis, and in bio-trickling filter filler, biomembrane is excessively accumulated the technical field of control, refers in particular to a kind of surfactant that adopts and controls the method that in bio-trickling, biomembrane is excessively accumulated.
Background technology
When gas phase biological filtering technology is applied in low concentration volatile organic matter (Volatile Organic Compounds, abbreviation VOCs) control, because reliable, the with low cost and eco-friendly feature of its technology obtains broad research and application.Wherein the most ripe is bio-trickling filter, and this technology is mainly by the microorganism of set growth on filler, at dusty gas, is degraded to CO during by packing layer by it
2, H
2o and synthesising biological film.Meanwhile, on top, by the mode of spray, add nutrient solution, not only for bed provides moisture content but also for growth of microorganism, provide necessary nutrient.
Filler for bio-trickling filter mainly contains nature organic filler and inertia synthetic filling, the carrier that normal mode of usining accumulation is bred as growth of microorganism.Because organic filler exists the prolongation along with running time, organic substance can be degraded gradually and be caused bed compacting, the shortcoming that the device performance that finally induces reaction worsens, so mostly adopt at present synthetic filling in bio-trickling filter, both can avoid filling compaction, can make being again uniformly distributed of gas-liquid-solid in filler, be conducive to improve the performance of bioreactor.
But no matter adopt the filler of what type, because active microorganism has vigorous growth and breeding vigor, tend to cause biomembranously in filler accumulate fast, particularly when processing the compound (toluene, ethanol etc.) of easily biological-degradable, when organic loading is higher, biomembrane accumulation is just more serious.When biomembrane occurs excessively to accumulate in filler, the increase of packing layer resistance in bio-trickling filter and the lower degradation operational issue of removal efficiency will be caused.Therefore, in filler, excessive biomembranous effective control is very important to maintaining bio-trickling filter degraded high-performance.At present, many researchers have proposed the various control strategy of physics, chemistry and biological mode and combination thereof for actual operating state.
The mode of the employing clear water such as Sorial or combined water and air backwash has been controlled biomembranous excessive accumulating to a certain extent.Regular change charge air flow direction is also controlled to a certain extent biomembrane and is accumulated.Smith etc. have reported that take the plastic beads of 6 mm is filler, adopt backwashing technology to control biomembrane, and under high toluene load, BTF has reached stable high removal efficiency.Cox and Deshusses find that the hunger period at 7 days can reduce by 10-50% biofilm biomass.Kim etc. think that what take that starvation method controls biomass under underload is feasible.Biomembrane is accumulated the continued operation process that physical control method tends to interrupt bio-trickling filter, and performance recovery needs a process.
Sonia Arriaga adds chloramphenicol (20 g/m in nutrient solution
3) and gentamicin sulphate (50 g/m3) with the growth of anti-bacteria.The propositions such as Smith be take nitrate and are replaced ammonia nitrogen can reduce increasing of microorganism as nitrogenous source.Reasonably control the excess growth that the nitrogen amount that is supplied in bio-trickling filter nutrient solution also can restriction micro-organisms.Successional supplying nutrition liquid is not wanted in Deshusses suggestion in BTF, because bio-trickling filter is understood the fast blocking because of biological excessive growth.In an other research, Cox etc. adopt chemical agent to clean Pall ring filler to control biomembrane accumulation, find with NaClO and H
2o
2after cleaning, on filler, remain biomembrane and lose activity completely; And after cleaning with NaOH, residue biomembrane activity is very low.The discoveries such as Xi Jingying are effectively to remove residue biomembrane with 0.4% NaOH solution circulation washing, but also need the convalescence of 3 ~ 4 days after rinsing.Adopt chemical method to control biomembrane accumulation, larger to remaining biomembranous activity influence, require cleaning frequency low, and also need a longer convalescence after this each cleaning, apply less.
Cox etc. have investigated in the BTF of degraded toluene, introduce two kinds of protozoans and control biomembranous accumulation, and author finds that in BTF, bioaccumulation rate is lower.This mode, because not introducing pollutant, does not produce secondary pollution yet, has in theory very large potentiality, but in practical application, needs further to be studied.
In addition, excessive biomembrane is controlled, required expense accounts for 30% left and right of total processing cost, is a sizable part.Although for suspension reactor, because microorganism wherein presents the impact of suspension growth state inanimate object film excessive accumulation in liquid phase, liquid phase is continuous phase, causes very high pressure drop (up to 1 ~ 5 m water column), the power cost therefore needing is higher.
In sum, no matter take all can cause the minimizing of active microorganism in filler after which type of biomembrane control measure, cause operation process to interrupt and a microbial activity recovery stage of experience, and temporary decline or irrecoverable appears in the performance that causes bio-trickling filter, finally control effect not ideal.The present invention is directed to the excessive accumulation problems of biomembrane in bio-trickling filter filler and proposed effective control method, adopt the method for introducing surfactant in bio-trickling filter nutrient solution to control, can control cost-effectively biofilm biomass in filler, and at long-term lower pressure drop and the stable degradation property of maintaining in service.
Summary of the invention
The problem to be solved in the present invention is just: the technical problem existing for existing excessive accumulation of biological membranes in biological trickling filter control method, the invention provides and a kind ofly by introduce the mode of surfactant in nutrient solution, control the control method that in filler, biomembrane is excessively accumulated.This control method can not interrupted and experience the performance recovery stage bio-trickling filter operation, can long term maintenance packing layer low pressure drop and keep reactor high-performance, can solve cost-effectively bio-trickling filter and when long-term operation, because of biomembrane, excessively accumulate a difficult problem for the hydraulic performance decline causing.
For solving the problems of the technologies described above, the solution that the present invention proposes is: a kind of method of controlling excessive accumulation of biological membranes in biological trickling filter, and its feature comprises following steps:
(1) adopt activated sludge to inoculate bio-trickling filter, in bio-trickling filter, pass into volatile organic matter, reach after normal operating condition, adopt surfactant to tame the microorganism in packing layer simultaneously;
(2) in bio-trickling filter nutrient solution feed trough, introduce surfactant, adopt nutrient solution circulating pump that nutrient solution and surfactant mixed liquor are sprayed to packing layer surface by shower nozzle;
(3) when the surfactant of spray is from up to down flowed through each packing layer successively, biomembrane is soaked, disperses, lubricated and washing, through sluicing, discharge bio-trickling filter.
Described surfactant refers to polyalcohol type and Determination of Polyoxyethylene Non-ionic Surfactants, comprises Triton X-100 (Triton X-100), high-carbon fatty alcohol polyoxyethylene ether, polyoxyethylene carboxylate.
Described surfactant is introduced in bio-trickling filter nutrient solution feed trough, and makes surfactant and nutrient solution mix formation mixed liquor by agitating device, and surfactant concentration is 0.01 ~ 0.05%.
Described nutrient solution and surfactant mixed liquor adopt nutrient solution circulating pump to spray to filler by shower nozzle cyclical intermission, and the spray cycle is every 10 ~ 30 s spray 5 ~ 10 s.
Described filler is uniform holey integral material, and its porosity is 90%～98%, aperture is that 10～20 PPI, specific area are 100～1000 m
2/ m
3material, microorganism is easy to apposition growth on material skeleton.
Essence of the present invention is to utilize the interior liquid phase of surface reactive material change filler of low concentration and the surface nature of biomembrane phase, by to biomembranous dispersion, lubricated, cleaning function, sluicing in conjunction with mixed liquor is discharged system in time by the biomembrane of aging or poor adhesive force, thereby make the biomembrane in holey filler controlled, the method can not interrupted continued operation process and the experience microbial activity recovery stage of bio-trickling filter, can keep for a long time the runnability of continous-stable.
Compared with prior art, advantage of the present invention is just:
(1) economical and effective is controlled and biomembranously in filler excessively to be accumulated: the mixed liquor that contains certain density surfactant sprays to filler and when filler intrastratal flow, due to surfactant to biomembranous wetting, disperse, lubricated and cleaning function, microorganism aging or poor adhesive force is easy to depart from filler skeleton or biomembranous surface under the souring of waterpower and discharges system with mixed liquor.Meanwhile, the Integral net shaped pore structure due to adopted filler also can make the unlikely excessive loss of biomembrane wherein to biomembranous crown_interception;
(2) in packing layer, microbial activity is high: in the situation that surfactant exists, in filler aging with microorganism poor adhesive force by under the washing at surfactant and sluicing effect, from filler Skeleton Table emaciated face, fall rapidly, and newborn, the microorganism of high vigor can close attachment on filler skeleton, in packing layer, the old and new microorganism dynamically substitutes process frequently, and the metabolite producing in microbial degradation process also can be discharged in time, reduced it to the murder by poisoning of microorganism or inhibitory action, therefore microorganism can remain high activity,
(3) organic matter removal efficiency is high: by introduce surfactant in nutrient solution, reduced the surface tension of liquid phase, reduced the resistance to mass tranfer between gas-liquid, thereby improved the particularly concentration of hydrophobic organic compound in liquid phase of organic matter, therefore can effectively improve the degradation efficiency of BTF to pollutant, widen bio-trickling filter and effectively processed the scope of application of VOCs, further excavated the potentiality that bio-trickling filter is processed VOCs;
(4) move for a long time that pressure drop is low, stable performance: owing to adopting surface-active in the mixed liquor of spray excessively to accumulate control to the biomembrane in packing layer, while moving for a long time, change in pressure drop is smaller, maintains 100 Pa left and right.And adopt this control method can keep the long-term running status continuously of bio-trickling filter, can not cause operation process to interrupt and a microbial activity recovery stage of experience, thereby can keep for a long time bio-trickling filter stable performance;
(5) operating cost is low, easy and simple to handle: adopt surfactant to control and biomembranously in packing layer excessively accumulate, because its concentration is low, dosage of surfactant seldom; And the pressure drop of when operation is low, corresponding power cost is also low, for extensive bio-trickling device, is very favorable.After this control method only need be introduced into surfactant and be uniformly mixed in nutrient solution storage tank, operate quite easyly, and be easy to control.
The specific embodiment
Below in conjunction with specific embodiment, further describe the present invention.
The present embodiment is to simulate the processing object that n-hexane waste gas is bio-trickling filter (Biotrickling filter, BTF), adopts surfactant to control the biomembrane in packing layer.
The device using in the present embodiment is barrel type reactor.It is is mainly imported and exported and is formed by barrel, polyurethane sponge packing layer, nutrient solution supply pump and nozzle, supporting screening plate, gas/liquid body.Apparatus main body is lucite tube, internal diameter 10 cm, and high 80 cm, inside establish three layers of polyurethane sponge filler, and aperture is 20 PPI, and floor height is 10 cm, and the plastic support sieve plate of 10 cm is installed in every layer of filler bottom, has the aperture of equally distributed 3 mm on it.At the top of this device, be reserved with the height of 10 cm to regulate nutrient solution spray height.Bottom of device also leaves the height of 10 cm to collect the nutrient solution of discharging.At every two interlayers of device, be equipped with thief hole, at top and bottom, be also provided with pressure monitoring hole.At this device top, nutrient solution nozzle is housed, and is connected with nutrient solution feed system.Device outside is also provided with a set of automatic water bath system, with the temperature stabilization of holdout device inside 25 ° of C left and right.
What when this device starts, adopt is that in municipal sewage plant's second pond, fresh activated sludge is inoculated, mud is fetched the rear coarse impurities of first removing in sewage, be placed in bucket, clean polyurethane sponge filling block is soaked wherein completely, and carry out aeration, every 8 hours, by polyurethane sponge and sludge stirring, after 48 hours, take out, be placed on relevant position in BTF.Then, to BTF top inlet, pass into concentration and be about 130 mg/m
3n-hexane waste gas, gas flow is 280 L/s, corresponding gas residence time is 30 s, carries out start-up operation.And spray at regular time and quantity and be rich in the necessary various constants of growth of microorganism and micro-nutrient solution to filling surface by BTF top shower nozzle, spray flux is 4.5 L/d, the spray cycle is often divided into 15 s and sprays 6 s, moves in the same way with air-flow.Along with the prolongation of running time, can be observed obvious filemot gunk (biomembrane) and be attached on filler, simultaneously, n-hexane removal efficiency also slowly increases, after 20 days, be stabilized in 90% left and right, it is stable that pressure drop keeps, and BTF successfully starts and reaches normal operating condition.Due to startup stage initial stage, nutrient solution does not run off to adhering to washing away of bacterial classification in filler, need be to suitably supplementing bacterial classification in BTF.
Next, in nutrient solution feed trough, add surfactant (Triton X-100), by agitator, make rapidly nutrient solution and surfactant mix, the concentration of control surface activating agent is 0.005%, and other controlled conditions remain unchanged, operation a period of time, after BTF stable performance, then to improve its concentration be 0.01%, continues operation, when BTF is stabilized in 86% left and right to the removal efficiency of n-hexane waste gas, finish the domestication stage.
After the domestication stage finishes, biomembrane when investigation BTF moves for a long time under high-load condition in filler is accumulated situation.It is 0.01% constant keeping in nutrient solution surfactant concentration, improves concentration to 520 mg/m of n-hexane in air inlet
3, other conditions remain unchanged, and after an operation in month, removal efficiency is stabilized in 84%, and pressure drop is 98 Pa, and now BTF has reached stable state to the removal capacity of n-hexane.Next, keep all conditions constant, move continuously half a year, during performance quite stable, removal efficiency surpasses 82%; Change in pressure drop is smaller, maintains all the time 100 Pa left and right, shows that in BTF filler, phenomenon does not occur excessively to accumulate biomembrane.Special needs to be pointed out is, because the hydrophobicity of n-hexane is strong, its solubility in water is very low, resistance to mass tranfer between gas-liquid makes BTF all lower to the treatment effeciency of this type of material, yet in the present embodiment, when import n-hexane concentration is higher, due to the decreasing by surfactant of low concentration the surface tension of liquid phase in filler, improved the solubility of n-hexane in liquid phase, thereby making BTF be issued to high-performance in the n-hexane condition of high concentration, this is the another one important advantage of using surfactant in the present embodiment.In addition, in long-term running, the continuous degradation of contaminant of microorganism, synthetic cell and realize continuous propagation simultaneously, but because microorganism aging or poor adhesive force is discharged BTF under the sluicing effect of the dispersion of surfactant, lubricated, cleaning function and mixed liquor, the old and new microorganism in packing layer is frequently substituted, keep a dynamic balance state, thereby make microorganism can remain high degrading activity.Meanwhile, the biomass in filler is effectively controlled, and has avoided the biomembranous performance causing of excessively accumulating to worsen, and also can realize the long-term running status continuously of BTF, can not cause operation process interrupt and experience a microbial activity and recover the stage.
The present invention is not limited to above-mentioned giving an example, those skilled in the art, and in essential scope of the present invention, the variation of making, improvement or replacement, all should belong to protection scope of the present invention.
Claims (3)
1. control a method for excessive accumulation of biological membranes in biological trickling filter, its feature comprises following steps:
(1) adopt activated sludge to inoculate bio-trickling filter, in bio-trickling filter, pass into volatile organic matter, reach after normal operating condition, adopt surfactant to tame the microorganism in packing layer simultaneously;
(2) in bio-trickling filter nutrient solution feed trough, introduce surfactant, adopt nutrient solution circulating pump that nutrient solution and surfactant mixed liquor are sprayed to packing layer surface by shower nozzle;
(3) when the surfactant of spray is from up to down flowed through each packing layer successively, biomembrane is soaked, disperses, lubricated and washing, through sluicing, discharge bio-trickling filter;
Wherein, described surfactant refers to polyalcohol type and Determination of Polyoxyethylene Non-ionic Surfactants, comprises Triton X-100, high-carbon fatty alcohol polyoxyethylene ether, polyoxyethylene carboxylate; Described surfactant is introduced in bio-trickling filter nutrient solution feed trough, and makes surfactant and nutrient solution mix formation mixed liquor by agitating device, and surfactant concentration is 0.01 ~ 0.1%.
2. a kind of method of controlling excessive accumulation of biological membranes in biological trickling filter according to claim 1, it is characterized in that: described nutrient solution and surfactant mixed liquor spray to filler by shower nozzle cyclical intermission, the spray cycle is every 10 ~ 30 s spray 5 ~ 10 s.
3. a kind of method of controlling excessive accumulation of biological membranes in biological trickling filter according to claim 1, it is characterized in that: described filler is uniform holey integral material, its porosity is 90%～98%, aperture is that 10～20 PPI, specific area are 100～1000 m
2/ m
3material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110336979.6A CN102500228B (en) | 2011-10-31 | 2011-10-31 | Method for controlling excessive accumulation of biological membranes in biological trickling filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110336979.6A CN102500228B (en) | 2011-10-31 | 2011-10-31 | Method for controlling excessive accumulation of biological membranes in biological trickling filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102500228A CN102500228A (en) | 2012-06-20 |
| CN102500228B true CN102500228B (en) | 2014-04-02 |
Family
ID=46212395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110336979.6A Expired - Fee Related CN102500228B (en) | 2011-10-31 | 2011-10-31 | Method for controlling excessive accumulation of biological membranes in biological trickling filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102500228B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103463968A (en) * | 2013-09-29 | 2013-12-25 | 浙江工商大学 | Method for improving processing of high-load n-hexane waste gas by biotrickling filter |
| CN104909454B (en) * | 2015-05-19 | 2017-06-23 | 中国科学院广州能源研究所 | A kind of method of soft cellulose filler biomembrane conglomeration in releasing anaerobic reactor |
| CN105233663A (en) * | 2015-09-14 | 2016-01-13 | 湖南大学 | Reinforced removing method for hydrophobic n-hexane in waste gas through biological drop filter |
| CN110937681B (en) * | 2019-11-07 | 2022-05-06 | 长沙理工大学 | Culture method of aerobic granular sludge |
| CN113522008B (en) * | 2021-07-29 | 2023-07-18 | 广东石油化工学院 | Biological filtering device and method for treating light hydrocarbon waste gas |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2083264C1 (en) * | 1995-02-20 | 1997-07-10 | Акционерное общество "Нижнекамскнефтехим" | Method for biological purification of off-gases |
| CN1895746A (en) * | 2006-06-17 | 2007-01-17 | 卢自金 | High efficient biological purifying process and system for organic waste gas |
| CN201744303U (en) * | 2010-08-05 | 2011-02-16 | 杨海宁 | Biofiltration device used for waste gas treatment |
| CN101992022A (en) * | 2010-10-13 | 2011-03-30 | 长沙理工大学 | Method for controlling excessive biomembrane accumulation in gas-phase biofilter |
-
2011
- 2011-10-31 CN CN201110336979.6A patent/CN102500228B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2083264C1 (en) * | 1995-02-20 | 1997-07-10 | Акционерное общество "Нижнекамскнефтехим" | Method for biological purification of off-gases |
| CN1895746A (en) * | 2006-06-17 | 2007-01-17 | 卢自金 | High efficient biological purifying process and system for organic waste gas |
| CN201744303U (en) * | 2010-08-05 | 2011-02-16 | 杨海宁 | Biofiltration device used for waste gas treatment |
| CN101992022A (en) * | 2010-10-13 | 2011-03-30 | 长沙理工大学 | Method for controlling excessive biomembrane accumulation in gas-phase biofilter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102500228A (en) | 2012-06-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102500228B (en) | Method for controlling excessive accumulation of biological membranes in biological trickling filter | |
| US5389258A (en) | Method for the anaerobic decomposition of organic waste | |
| JP5038985B2 (en) | Aeration-less water treatment system | |
| US20140076788A1 (en) | Sewage treatment system | |
| CN202688095U (en) | Efficient bioreactor for treating printing and dyeing wastewater | |
| CN104085988A (en) | Device and method for processing coking wastewater by adopting suspended filler-anaerobic membrane bioreactor | |
| WO2012016494A1 (en) | Multi-tube exhaust gas biological filtering device | |
| CN110117134B (en) | Rural domestic sewage treatment process | |
| CN1283565C (en) | Method for waste water treatment by utilizing intermittent aeration and re-circulations | |
| CN102674636A (en) | Dynamic combined reaction device for biological treatment of printing and dyeing wastewater | |
| CN102921293B (en) | Method for processing foul gas through using biological combined technology | |
| CN102190374A (en) | Trickling biofilter | |
| CN102188899B (en) | Deodorizing device and deodorizing method of bio-trickling filtration tower | |
| CN101157497A (en) | Dispersed tricking biofilter reactor for treating waste water | |
| CN102030409A (en) | Sewage treatment device and process for large modularized gravity-flow self-forming dynamic membrane bio-reactor (MBR) | |
| CN1834034A (en) | Method of treatment of and circulation utilization of hoggery sewage by using earthworm biological filter cell | |
| CN101182073B (en) | High-load biological filter tank sewage water treating method capable of backwashing | |
| CN201154935Y (en) | Chemical fabrics waste water treatment plant | |
| CN207775020U (en) | A kind of submerged hollow fibre membrane module in bioreactor and petrochemical wastewater processing system | |
| CN202246241U (en) | Dynamic membrane bioreactor | |
| CN202038946U (en) | Wastewater treatment device in acrylic production process | |
| CN207903981U (en) | A kind of efficient up-flow biological reaction apparatus | |
| RU2058942C1 (en) | Method and apparatus for sewage biological purification | |
| JP2007175686A (en) | Anaerobic sprinkling filtration method and apparatus for organic waste water | |
| CN1233572C (en) | Apparatus and method for treating wastewater using biolgical filtering medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20141031 |
|
| EXPY | Termination of patent right or utility model |