CN101955294B - Integrated bioreactor and method for treating high-concentration organic wastewater - Google Patents
Integrated bioreactor and method for treating high-concentration organic wastewater Download PDFInfo
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
本发明公开了一体化生物反应器及其应用和处理高浓度有机废水的方法，其属于废水处理领域。一体化生物反应器采用同心圆柱状结构，内层为UASB，外层为MBBR。在UASB出水口设置pH在线监测仪，UASB底部设搅拌装置。集水池与反应器进口之间设循环泵，可回流MBBR出水，正常情况下回流比为100％。MBBR适合于低温下废水处理，同时其本身对于UASB可起到一定的供热保温作用；此外，当UASB出水pH＜6.8时，启动UASB的搅拌装置并增大MBBR回流比，可及时为UASB补充碱度，维持UASB的酸碱平衡，确保微生物的生态稳定。本发明提出的方法和装置可在低温条件下高效稳定地处理高浓度有机废水，投资少、占地省、运行稳定，无需外加碱度和加热，节省维护运行费用和能耗。
The invention discloses an integrated bioreactor, its application and a method for treating high-concentration organic wastewater, belonging to the field of wastewater treatment. The integrated bioreactor adopts a concentric cylindrical structure, the inner layer is UASB, and the outer layer is MBBR. A pH online monitor is installed at the outlet of the UASB, and a stirring device is installed at the bottom of the UASB. A circulating pump is installed between the sump and the reactor inlet to return the MBBR effluent, and the reflux ratio is 100% under normal circumstances. MBBR is suitable for wastewater treatment at low temperature, and at the same time, it can play a certain role in heat supply and heat preservation for UASB; in addition, when the pH of UASB effluent is less than 6.8, start the stirring device of UASB and increase the reflux ratio of MBBR, which can replenish UASB in time Alkalinity, maintain the acid-base balance of UASB, and ensure the ecological stability of microorganisms. The method and device proposed by the invention can efficiently and stably treat high-concentration organic wastewater under low temperature conditions, with less investment, less land occupation, stable operation, and no need for additional alkalinity and heating, saving maintenance and operation costs and energy consumption.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment equipment and application thereof and processing waste water, say more specifically the method for integrated bioreactor and application thereof and processing high concentrated organic wastewater.
In recent years, up-flow anaerobic sludge blanket (UASB) is widely applied in China's Industrial Wastewater Treatment, have and save that energy consumption and expense, sludge quantity are few, less investment easy care, capable of recovering energy source, can process the advantage such as hard-degrading high concentrated waste water, both can be used for separately wastewater treatment, also can be with the coupling of aerobe technology to obtain satisfied effluent quality.UASB mainly moves under middle temperature (30～35 ℃) condition and high temperature (50～55 ℃) condition, and in reactor, microorganism active is good, can obtain desirable effluent quality.Yet, when temperature is low (as in northern China or winter the time), microorganism active in UASB is suppressed, in case organic loading is too high, in reactor, acid base equilibrium is easy to the destroyed acidifying phenomenon that occurs, cause that effluent COD concentration is higher, water outlet pH is acidity, mud floating etc., effluent quality severe exacerbation.
In order to guarantee the steady running of UASB under cold condition, keep acid base equilibrium in reactor, avoid acidifying, can adopt heated waste water, add basicity, effluent recycling, water outlet stripping CO
2Rear backflow, add the measure such as low temperature bacterial strain, but in practical engineering application, these methods are existent defect and limitation all, as high in Financial cost, energy consumption large, contain more dissolved oxygen in recirculation water, there is no application example etc.The invention disclosed patent CN 1337364A such as Meng Zhaocheng adopt a kind of " sex change mud " of independent research to control the acidifying of UASB reactor, effective, cost is low, but should " sex change mud " need to carry out special biochemistry cultivation, and need the technician to throw in, level of automation is low.
Integrated bioreactor is that different biological treatments are incorporated in a reactor to process waste water, has less investment, takes up an area less, the advantages such as energy consumption is little, treatment effect good, convenient management, investigator's favor extremely both at home and abroad in recent years.The at present research in sanitary sewage and Industrial Wastewater Treatment and use more about integrated bioreactor, be mainly with different anaerobism, anoxic and aerobic process organic combination in a reactor, Integration Mode usually have the inner-outer sleeve cartridge type and the up and down superposing type.(the Xue Jia such as Xue Jia, Huang Jun, Li Yijun. integrated anaerobic-aerobic bioreactor is processed research application and the environmental organism journal of fermentation waste water, 2007,13 (3): 414～418) researched and developed a kind of integrated anaerobic-aerobic bioreactor of concentric drums form, for the treatment of the organic fermentation waste water of high density.Inner core is expanded granular sludge bed reactor, and urceolus is aerobic three-phase fluidized bed, is divided into the up-flow district, falls stream district and negative area.This reactor strong shock resistance, the COD clearance can reach more than 90%.(the Jiang Zhanpeng such as Jiang Zhanpeng, Zhong Yanmin, Shi Shaoqi. integrated A/O biofilm reactor is processed sanitary sewage. Chinese water supply and drainage, 2002,18 (8): 9～12) designed the up and down stacking pattern the flow lifting type integrated A/the O biofilm reactor is for the treatment of sanitary sewage, it is cylindric that device is, the bottom is for adopting the oxygen-starved area of Ball-type packing, top is for adopting the aerobic zone of semi soft packing, and when keeping basicity suitable in certain reflux ratio and reactor, denitrification effect is well stablized.Yet these integrated reactors are all at normal temperatures for the treatment of trade effluent and sanitary sewage, have not yet to see the R and D that are applicable to process under cold condition the integrated bioreactor of high concentrated organic wastewater.
MBBR (MBBR) is a kind of new and effective aerobic waste water treatment process of having drawn traditional activated sludge process and biological contact oxidation process.This technique is that the floating stuffing of proportion near water directly is added in reactor as microbe carrier, rely on the castering action of aeration and current to be in fluidized state, make microorganism can be fully with water in dissolved oxygen contact with organism, be conducive to the matrix transmission, thereby obtain good organic matter removal effect.Compare with other aerobic waste water treatment process, MBBR technique have occupation of land less, resistance to overload shock, the advantage such as sludge concentration is higher, surplus sludge volume is few, head loss is little, need not back flushing, generally need not reflux, Nitrogen/Phosphorus Removal is good.Simultaneously, a large amount of results of study show, and are high due to the MBBR sludge concentration, the biosolids residence time is long, also can obtain good treatment effect under cold condition.
Summary of the invention
1, invent the technical problem that will solve:
For there being the problem of easy acidifying under cold condition during (5～15 ℃) UASB reactor for treatment high concentrated organic wastewater, existing solution Shortcomings and limitation, the invention provides the method for integrated bioreactor and processing high concentrated organic wastewater, can avoid the generation of acidifying phenomenon.These apparatus and method also can be used for the processing of trade effluent under normal temperature condition.
2, technical scheme:
The present invention integrates the composition integrated bioreactor with up-flow anaerobic sludge blanket (UASB) and MBBR (MBBR), utilize the MBBR effluent recycling hydraulic agitation device increase rate of mass transfer and MBBR to be set to the insulation effect of UASB in basicity, UASB for UASB replenishes, need not add basicity or only need add a small amount of basicity and can keep acid base equilibrium in reactor, guarantee the Ecological Stabilization of microorganism in reactor, eliminate the acidifying phenomenon that easily produces in anaerobic biological treatment high concentrated organic wastewater process under cold condition.
Technical scheme of the present invention is as follows:
Integrated bioreactor adopts concentric(al) circles column structure, and internal layer is UASB, and skin is MBBR, and the MBBR effluent recycling is to UASB.
The water quality and quantity that the volume of UASB and MBBR and hydraulic detention time are processed waste water according to need determines, the width that the ratio of the width of MBBR reaction zone and height should be 0.25～0.5, MBBR refers to the poor of the diameter of integrated reactor and UASB diameter; At the UASB water outlet, pH on-line monitoring instrument is set, mechanical stirring device is set above the water-distributing device of bottom.Establish swash plate and half rhombus baffle plate apart from reactor bottom 1m～2m At The Height in the MBBR reaction zone; The MBBR distribution device is perforated pipe or aeration head, is concentric circles and is installed on above swash plate and half rhombus baffle plate.
The application of integrated bioreactor in processing high concentrated organic wastewater.
The method that this integrated bioreactor is processed high concentrated organic wastewater comprises the following steps:
(1) waste water is from UASB bottom water-distributing device water inlet, the water-distributing device top is provided with mechanical stirring device, by stirring, organism is fully mixed contacts with anaerobic grain sludge, through after hydrolysis, acidifying and product methane phase, anaerobion is degraded larger molecular organics and generates small organic molecule, biogas, carbonic acid gas and water, biogas, anaerobic sludge and water separate through triphase separator, biogas enters collection chamber, sludge settling enters the UASB reaction zone, flow to the reactor head water outlet on waste water and relies on flow by gravity to reactor bottom to enter outer MBBR;
(2) swash plate and the half rhombus baffle plate in the MBBR reaction zone carries out the secondary mud-water separation to the UASB water outlet, is equivalent to the follow-up mud second pond of UASB in conventional processing;
(3) waste water continues the upper reaches, during through the MBBR aerating apparatus, the fierce mixing occurs with gas, then gas, water fully contact with the filler of fluidized state, in water, organism is generated carbonic acid gas and water by the degraded of the microorganism aerobic of filling surface, the MBBR top sets out mill weir, and water outlet is flowed out thus and entered water collecting basin;
(4) establish reflux pump between water collecting basin and integrated bioreactor, can be with effluent recycling to the reactor inlet place.
The mechanical stirring device of UASB bottom is closed under normal circumstances in step (1), stirs when UASB water outlet pH＜6.8.
Add the floating stuffing that proportion is 0.93-0.99 in MBBR in step (3), filling ratio is 40%-60%, and aeration rate need guarantee that dissolved oxygen content is 2mg/L-4mg/L.Numerical range in this step is not definitely strict restriction, as long as all can meet the demands in this proportion, filling ratio and aeration rate scope.
The MBBR effluent recycling is 100%-300% to the reflux ratio of UASB in step (4), and reflux ratio is 100% when UASB water outlet pH is 6.8～7.5, increases reflux ratio when pH＜6.8.
One of essential condition of keeping the steady running of UASB reactor is that pH should be controlled at 6.5～7.8, keeps acid base equilibrium by the supercarbonate/bicarbonate-carbonic acid buffer of reactor self under normal circumstances.Aerobe is processed also can produce CO
2And formation carbonic acid, but because aerobic aeration is easy to the CO that stripping falls high density
2, and also can produce basicity in some organic degradation process, so aerobe is processed, and need not to add basicity and go out alkalinity of water sometimes also can be higher than influent alkalinity.When temperature is low, in the UASB reactor, microorganism active is suppressed, organism and VFA degraded are insufficient, when VFA concentration is high be not enough to bicarbonate alkalinity in and the time, acid base equilibrium is destroyed, cause water outlet pH to reduce and the rising of COD concentration, anaerobic effluent refluxed and can't play the effect that replenishes basicity this moment.Yet, undegradablely can discharge cationic organic composition (as protein), organic acid salt or soap etc. in a large number in anaerobic effluent, can be produced very high basicity after aerobic degradation, add that VFA is degraded, CO in water in the aerobic aeration process
2By stripping, in water, basicity can increase greatly, therefore outputted aerobic water is refluxed and can reduce the amount that adds basicity and even can not add basicity for UASB replenishes basicity, recovers the acid base equilibrium of anaerobic zone.The key that above theory is tried out is the follow-up aerobic treatment process of UASB, necessary steady running at low temperatures, and can resist load impact, the organism in its water outlet of can degrading preferably when acidifying occurs UASB.Based on above consideration, the present invention selects MBBR as the follow-up aerobic treatment process of UASB.MBBR is a kind of new and effective aerobic waste water treatment process, have that sludge concentration is higher, surplus sludge volume is few, the advantage such as stable under resistance to overload shock, low temperature, head loss is little, need not back flushing, generally need not reflux, Nitrogen/Phosphorus Removal is good, when appearring in UASB, acidifying can adapt to preferably load impact, organism in degradation water is for UASB provides basicity.
In order to save occupation of land, reduce cost, raising processing efficiency, the present invention is integrated into UASB and MBBR the integrated reactor of concentric(al) circles column structure, and internal layer is UASB, and skin is MBBR.MBBR belongs to aerobe reactor, and in the aerobic reaction process, microorganism carries out oxygenolysis to organism, generates CO
2And H
2O and release of heat, MBBR can keep comparatively high temps, adds the poor thermal conductivity of water, so MBBR can play to internal layer UASB the effect of heat supply insulation.
At the UASB water outlet, pH on-line monitoring instrument is set, adjusts MBBR effluent recycling ratio according to water outlet pH value.Under normal circumstances, MBBR effluent recycling ratio is 100%, can be UASB enough basicity is provided; When pH＜6.8, show that the acidifying phenomenon might appear in UASB, increase the MBBR reflux ratio this moment, to replenish more polybase degree; Simultaneously, improve MBBR effluent recycling ratio and can also dilute water inlet, reduce organic loading, help to recover the UASB acid base equilibrium.
When water temperature was low, in reactor, water viscosity became large, rate of mass transfer and slows down, the organic matter degradation difficulty, easily promote the generation of acidifying, therefore, mechanical stirring device is set bottom UASB, stir when UASB water outlet pH＜6.8, strengthen hydraulic disturbance, strengthen the matrix transmission; Can not stir to save energy consumption under normal circumstances.
Establish swash plate and half rhombus baffle plate apart from reactor bottom 1m～2m At The Height in the MBBR reaction zone, can replace second pond to carry out the secondary mud-water separation to the mud in the UASB water outlet, and the sludge loss that a large amount of mud floatings are brought can avoid the UASB acidifying time.
3, beneficial effect:
The invention provides the method for integrated bioreactor and application thereof and processing high concentrated organic wastewater, need not add basicity or only need add a small amount of basicity and can keep acid base equilibrium in reactor, guarantee the Ecological Stabilization of microorganism in reactor, eliminate the acidifying phenomenon that easily produces in anaerobic biological treatment high concentrated organic wastewater process under cold condition, less investment, cost are low, easy care, stable, level of automation is high.The present invention also can utilize the upgrading that undergoes technological transformation of built UASB reactor, and quantities is little, cost is low.
Description of drawings
Fig. 1 is structural representation of the present invention, and the concrete size of reactor needs to design according to the influent quality water yield.Wherein 1, the UASB reaction zone, 2, whipping appts, 3, pH on-line monitoring instrument, 4, triphase separator, 5, collection chamber, 6, swash plate, 7, half rhombus baffle plate, 8, aerating apparatus, 9, the MBBR reaction zone, 10, water collecting basin, 11, reflux pump, 12, water-distributing device, 13, sludge pipe
Embodiment
Way of realization of the present invention is that UASB and MBBR are integrated the composition integrated bioreactor, adopts concentric(al) circles column structure, and internal layer is UASB, and skin is MBBR, and the MBBR effluent recycling is to UASB; The water quality and quantity that the volume of UASB and MBBR and hydraulic detention time are processed waste water according to need determines, the width that the ratio of the width of MBBR reaction zone and height should be 0.25～0.5, MBBR refers to the poor of the diameter of integrated reactor and UASB diameter; At the UASB water outlet, pH on-line monitoring instrument is set, mechanical stirring device is set above the water-distributing device of bottom; Establish swash plate and half rhombus baffle plate apart from reactor bottom 1m～2m At The Height in MBBR; The MBBR distribution device is perforated pipe or aeration head, is concentric circles and is installed on above swash plate and half rhombus baffle plate.
waste water enters UASB reaction zone (1) by reactor bottom water-distributing device (12), stirring by UASB mechanical stirring device (2) makes in waste water organism fully mix with anaerobic grain sludge and contacts, flow to the top water outlet on after anaerobic biodegradation, the biogas that the anaerobic reaction district produces enters collection chamber (5) after triphase separator (4) separates, water outlet relies on flow by gravity to reactor bottom to enter outer MBBR reactor, carry out the secondary mud-water separation through swash plate (6) and half rhombus baffle plate (7), then pass through MBBR aerating apparatus (8), the fierce mixing occurs with gas, again with MBBR reaction zone (9) in be fluidized state filler fully contact, in water, organism is degraded by the microorganism aerobic of filling surface, the MBBR top sets out mill weir, water outlet is flowed out thus and is entered water collecting basin (10), establish reflux pump (11) between water collecting basin and integrated bioreactor, with effluent recycling to UASB.The mechanical stirring device of UASB bottom is closed under normal circumstances, stirs when UASB water outlet pH＜6.8; Add the floating stuffing that proportion is 0.93-0.99 in the MBBR reaction zone, filling ratio is 40%-60%, and aeration rate need guarantee that dissolved oxygen content is 2mg/L-4mg/L; The MBBR effluent recycling is 100%-300% to the reflux ratio of UASB, and reflux ratio is 100% when UASB water outlet pH is 6.8～7.5, increases reflux ratio when pH＜6.8.
Embodiment 1:
Its equipment and treatment scheme are the same, process in the winter time high concentrated organic wastewater with the present invention, and temperature is 5～15 ℃, and waste water quality sees Table 1:
Table 1 high concentrated organic wastewater water-quality guideline
| Water-quality guideline | COD(mg/L) | BOD(mg/L) | pH | Basicity |
| Variation range | 3500～4500 | 2900～3600 | 6.5～8.5 | 400～750 |
The hydraulic detention time of UASB is 18h, and the hydraulic detention time of MBBR is 6h, and it is 0.96 floating stuffing that the MBBR district adds proportion, and filling ratio is 60%, and dissolved oxygen content is 4mg/L.The pH of strict monitoring UASB reactor water outlet in operational process, and in time regulate reflux ratio, pH is minimum is 6.3, regulates reflux ratio this moment and is 300% pH is returned to more than 6.8.Run duration integrated reactor treatment effect is good and stable, and effluent quality sees Table 2:
Table 2 reactor effluent quality index
| Water-quality guideline | COD(mg/L) | BOD(mg/L) | pH |
| Variation range | 120～200 | 30～40 | 7～8.5 |
[0039]Comparative example 1: adopt UASB and integrated reactor of the present invention to process simultaneously this high concentrated organic wastewater, hydraulic detention time is 18h.When temperature was 10～15 ℃, the COD clearance only had 60%; When temperature was 5～10 ℃, the COD clearance only had 20%～40%, and water outlet VFA concentration reaches 600～1000mg/L, and the acidifying phenomenon has appearred in reactor, in order to guarantee the normal operation of reactor, must add 3000mg/L basicity.
Embodiment 2:
Its equipment and treatment scheme are the same, process in the winter time certain beer brewery water with the present invention, and waste water quality sees Table 3:
Table 3 high concentrated organic wastewater water-quality guideline
| Water-quality guideline | COD(mg/L) | BOD(mg/L) | pH | Basicity |
| Variation range | 1800～2600 | 900～1600 | 6.0～7.0 | 300～550 |
The hydraulic detention time of UASB is 14h, and the hydraulic detention time of MBBR is 4h, and it is 0.99 floating stuffing that the MBBR district adds proportion, and filling ratio is 40%, and dissolved oxygen content is 2mg/L.The pH of strict monitoring UASB reactor water outlet in operational process, and in time regulate reflux ratio, pH is minimum is 6.5, regulates reflux ratio this moment and is 200% pH is returned to more than 6.8.Run duration integrated reactor treatment effect is good and stable, and effluent quality sees Table 4:
Table 4 reactor effluent quality index
| Water-quality guideline | COD(mg/L) | BOD(mg/L) | pH |
| Variation range | 80～120 | 20～35 | 7.0～8.0 |
Comparative example 2: adopt UASB and integrated reactor of the present invention to process simultaneously this beer waste water, hydraulic detention time is 14h.When temperature was 10～15 ℃, the COD clearance only had 65%; When temperature was 5～10 ℃, the COD clearance only had 30%～45%, and water outlet VFA concentration reaches 500～800mg/L, and the acidifying phenomenon has appearred in reactor, in order to guarantee the normal operation of reactor, must add 2000mg/L basicity.
The present invention also can be used under normal temperature the processing for high concentrated organic wastewater.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009102327750A CN101955294B (en) | 2009-12-01 | 2009-12-01 | Integrated bioreactor and method for treating high-concentration organic wastewater |
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| US9896363B2 (en) | 2015-04-06 | 2018-02-20 | Headworks Bio Inc. | Moving bed biofilm reactor for waste water treatment system |
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