CN101955294A - Integrated bioreactor as well as application thereof and method for treating high-concentration organic wastewater - Google Patents
Integrated bioreactor as well as application thereof 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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- 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
The invention discloses an integrated bioreactor as well as the application thereof 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 of which is a UASB (Upflow Anaerobic Sludge Blanket) and the outer layer of which is an MBBR (Moving Bed Biofilm Reactor), wherein a pH online monitor is arranged at the water outlet of the UASB which is provided with a stirring device at the bottom, a cycle pump is arranged between a water collecting tank and the inlet of the reactor for refluxing the effluence of the MBBR in a reflux ratio of 100 percent in normal circumstance, and the MBBR is suitable for wastewater treatment at a lower temperature and can take a certain heat supply and preservation action to the UASB. In addition, an effluence pH value of the UASB is smaller than 6.8, and the stirring device of the UASB is started to increase the reflux ratio of the MBBR, complement the alkalinity of the UASB in time, maintain the acid-base balance of the UASB and ensure the biologic stability of microorganisms. The method and the device provided by the invention can stably treat the high-concentration organic wastewater under a low-temperature condition with high efficiency, has less investment, small floor area and stable operation without additional alkalinity or heating, saves maintenance and operation costs and reduces energy consumption.
Description
Technical field
The present invention relates to the method for a kind of wastewater treatment equipment and application thereof and processing waste water, the method for say so more specifically integrated bioreactor and application thereof and processing high concentrated organic wastewater.
Technical background
In recent years, up-flow anaerobic sludge blanket (UASB) has obtained widespread use in China's Industrial Wastewater Treatment, have and save that energy consumption and expense, sludge quantity are few, less investment easy care, the recyclable energy, can handle advantage such as hard-degrading high concentrated waste water, both can be used for wastewater treatment separately, also can 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 microorganism active is good in the reactor, can obtain the ideal effluent quality.Yet, when temperature is low (as the time) in northern China or winter, microorganism active among the UASB is suppressed, in case organic loading is too high, acid base equilibrium is easy to the destroyed acidifying phenomenon that occurs in the reactor, cause that effluent COD concentration is higher, water outlet pH is acidity, mud come-up etc., effluent quality severe exacerbation.
In order to guarantee the steady running of UASB under cold condition, keep acid base equilibrium in the reactor, avoid acidifying, can adopt heated waste water, add basicity, effluent recycling, water outlet stripping CO
2After reflux, add measure such as low temperature bacterial strain, but in practical engineering application, these methods all exist shortcoming and limitation, contain more dissolved oxygen in, the recirculation water big as Financial cost height, energy consumption, still have an application example etc.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 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 the reactor to handle waste water, has less investment, takes up an area of less, advantages such as energy consumption is little, treatment effect good, convenient management, investigator's favor extremely both at home and abroad in recent years.At present about integrated bioreactor in sanitary sewage and Industrial Wastewater Treatment research and use more, mainly be with different anaerobism, anoxic and aerobic process organic combination in a reactor, the integration mode has inside and outside sleeve formula and superposing type up and down usually.(Xue Jia such as Xue Jia, Huang Jun, Li Yijun. the research of anaerobic aerobic integratedization bioreactor for treatment fermentation waste water. use and the environmental organism journal, 2007,13 (3): 414～418) researched and developed a kind of anaerobic aerobic integratedization bio-reactor of concentric drums form, be used to handle the organic fermentation waste water of high density.Inner core is the anaerobic grain sludge expanded bed, 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%.(Jiang Zhanpeng such as Jiang Zhanpeng, Zhong Yanmin, Shi Shaoqi. integrated A/O biofilm reactor is handled sanitary sewage. Chinese water supply and drainage, 2002,18 (8): 9～12) designed up and down that the flow lifting type integrated A/O biofilm reactor of stacking pattern is used to handle 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 the reactor, denitrification effect is well stablized.Yet these integrated reactors all are to be used at normal temperatures handle trade effluent and sanitary sewage, have not yet to see to be applicable to the R and D of handling the integrated bioreactor of high concentrated organic wastewater under the cold condition.
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 technology is that the floating stuffing of proportion near water directly is added in the 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, help the matrix transmission, thereby obtain good organic matter removal effect.Compare with other aerobic waste water treatment process, MBBR technology have occupation of land less, resistance to overload shock, advantage such as sludge concentration is higher, surplus sludge volume is few, head loss is little, need not back flushing, generally need not reflux, denitrogenation dephosphorizing is respond well.Simultaneously, great deal of research results shows, because MBBR sludge concentration height, the biosolids residence time are long, also can obtain the good treatment effect under the cold condition.
Summary of the invention
1, invent the technical problem that will solve:
At there being easy acidifying problem under the cold condition during (5～15 ℃) UASB reactor for treatment high concentrated organic wastewater, existing solution exists deficiency 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 the 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 that waterpower whipping appts increase rate of mass transfer and the MBBR insulation effect to UASB is set in basicity, the UASB for UASB replenishes, need not add basicity or only need add a small amount of basicity and can keep acid base equilibrium in the reactor, the ecology that guarantees microorganism in the reactor is stable, eliminates the acidifying phenomenon that easily produces in the anaerobic biological treatment high concentrated organic wastewater process under the 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 handled waste water according to need determines that the width of MBBR reaction zone should be 0.25～0.5 with the ratio of height, and the width of 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, water-distributing device top in bottom is provided with mechanical stirring device.In the MBBR reaction zone, highly locate to establish swash plate and half rhombus baffle plate apart from reactor bottom 1m～2m; The MBBR distribution device is perforated pipe or aeration head, is concentric circles and is installed on swash plate and half rhombus baffle plate top.
The application of integrated bioreactor in handling high concentrated organic wastewater.
The method that this integrated bioreactor is handled high concentrated organic wastewater may further comprise the steps:
(1) waste water is from the water-distributing device water inlet of UASB bottom, the water-distributing device top is provided with mechanical stirring device, make by stirring that organism contacts with the anaerobic grain sludge thorough mixing in the waste water, through behind hydrolysis, acidifying and the product methane phase, anaerobion is with the larger molecular organics degraded and generate small organic molecule, biogas, carbonic acid gas and water, biogas, anaerobic sludge and water separate through triphase separator, biogas enters collection chamber, sludge settling is gone into the UASB reaction zone, flow to the reactor head water outlet on the 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 the conventional processing;
(3) waste water continues the upper reaches, during through the MBBR aerating apparatus, the fierce mixing takes place with gas, gas, water fully contact with the filler of fluidized state then, organism is generated carbonic acid gas and water by the degraded of the microorganism aerobic of filling surface in the water, 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 the integrated bioreactor, can be with effluent recycling to the reactor inlet place.
Close under the mechanical stirring device normal circumstances of UASB bottom in the step (1), when UASB water outlet pH＜6.8, stir.
Add the floating stuffing that proportion is 0.93-0.99 among the MBBR in the 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 the restriction of absolute strictness, 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 the 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 the normal circumstances.Aerobe is handled 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 handled to need not to add basicity and go out alkalinity of water and also can be higher than influent alkalinity sometimes.When temperature is low, microorganism active is suppressed in the UASB reactor, organism and VFA degraded are insufficient, when VFA concentration height in bicarbonate alkalinity is not enough to and the time, acid base equilibrium is destroyed, cause water outlet pH to reduce and the rising of COD concentration, this moment, the anaerobism effluent recycling can't play the effect that replenishes basicity.Yet, undegradablely can discharge cationic organic composition (as protein), organic acid salt or soap etc. in a large number in the anaerobism water outlet, can be produced very high basicity behind the aerobic degradation, add that VFA is degraded, CO in the water in the aerobic aeration process
2By stripping, basicity can increase greatly in the water, therefore outputted aerobic water is refluxed and can reduce to add the amount of basicity 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 when acidifying takes place UASB, can degrading preferably.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, stable under the resistance to overload shock, low temperature, advantage such as head loss is little, need not back flushing, generally need not reflux, denitrogenation dephosphorizing is respond well, when appearring in UASB, acidifying can adapt to load impact preferably, organism in the degradation water is for UASB provides basicity.
In order to save occupation of land, reduce investment, to improve processing efficiency, the present invention is integrated into the integrated reactor of concentric(al) circles column structure with UASB and MBBR, and internal layer is UASB, and skin is MBBR.MBBR belongs to aerobe reactor, and microorganism carries out oxygenolysis to organism in the aerobic reaction process, 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 the effect of heat supply insulation to internal layer UASB.
At the UASB water outlet pH on-line monitoring instrument is set, adjusts MBBR effluent recycling ratio according to water outlet pH value.Under the 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, water body viscosity became big, rate of mass transfer and slows down the organic matter degradation difficulty in the reactor, promote that easily acidifying takes place, therefore, mechanical stirring device is set in the UASB bottom, when UASB water outlet pH＜6.8, stir, strengthen hydraulic disturbance, strengthen the matrix transmission; Can not stir under the normal circumstances to save energy consumption.
In the MBBR reaction zone, highly locate to establish swash plate and half rhombus baffle plate, can replace second pond that the mud in the UASB water outlet is carried out the secondary mud-water separation apart from reactor bottom 1m～2m, and the sludge loss that a large amount of mud come-ups 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 the reactor, the ecology that guarantees microorganism in the reactor is stable, eliminate the acidifying phenomenon that easily produces in the anaerobic biological treatment high concentrated organic wastewater process under the cold condition, less investment, cost are low, easy care, stable, level of automation is high.The present invention also can utilize the UASB reactor that has built up the upgrading that undergoes technological transformation, and quantities is little, cost is low.
Description of drawings
Fig. 1 is a 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 handled waste water according to need determines that the width of MBBR reaction zone should be 0.25～0.5 with the ratio of height, and the width of 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, water-distributing device top in bottom is provided with mechanical stirring device; In MBBR, highly locate to establish swash plate and half rhombus baffle plate apart from reactor bottom 1m～2m; The MBBR distribution device is perforated pipe or aeration head, is concentric circles and is installed on swash plate and half rhombus baffle plate top.
Waste water enters UASB reaction zone (1) by reactor bottom water-distributing device (12), stirring by UASB mechanical stirring device (2) makes that organism contacts with the anaerobic grain sludge thorough mixing in the waste water, on behind the anaerobic biodegradation, flow to the top water outlet, 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), pass through MBBR aerating apparatus (8) then, the fierce mixing takes place with gas, again with MBBR reaction zone (9) in be fluidized state filler fully contact, organism is degraded by the microorganism aerobic of filling surface in the water, 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 the integrated bioreactor, with effluent recycling to UASB.Close under the mechanical stirring device normal circumstances of UASB bottom, when UASB water outlet pH＜6.8, stir; 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, handle high concentrated organic wastewater in the winter time 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 the operational process, and in time regulate reflux ratio, pH is minimum to be 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? |
Comparative example 1: adopt UASB and integrated reactor of the present invention to handle this high concentrated organic wastewater simultaneously, hydraulic detention time is 18h.When temperature was 10～15 ℃, the COD clearance had only 60%; When temperature was 5～10 ℃, the COD clearance had only 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, handle certain beer brewery water in the winter time 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 the operational process, and in time regulate reflux ratio, pH is minimum to be 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 handle this beer waste water simultaneously, hydraulic detention time is 14h.When temperature was 10～15 ℃, the COD clearance had only 65%; When temperature was 5～10 ℃, the COD clearance had only 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 the normal temperature processing for high concentrated organic wastewater.
Claims (10)
1. integrated bioreactor, comprise MBBR MBBR, it is characterized in that reactor adopts concentric(al) circles column structure, internal layer is upflow type anaerobic bio-reactor UASB, skin is MBBR MBBR, and the MBBR effluent recycling is to UASB.
2. integrated bioreactor according to claim 1 is characterized in that at the UASB water outlet pH on-line monitoring instrument being set.
3. integrated bioreactor according to claim 2 is characterized in that in the UASB bottom mechanical stirring device being set.
4. integrated bioreactor according to claim 3, the width that it is characterized in that the MBBR reaction zone is 0.25～0.5 with the ratio of height, the width of MBBR refers to the poor of the diameter of integrated reactor and UASB diameter.
5. integrated bioreactor according to claim 4 is characterized in that establishing swash plate and half rhombus baffle plate in MBBR, swash plate and half rhombus baffle plate are 1.0m～2.0m apart from the height of reactor bottom; The MBBR distribution device is perforated pipe or aeration head, is concentric circles and is installed on swash plate and half rhombus baffle plate top.
6. the application of each described integrated bioreactor in handling high concentrated organic wastewater in the claim 1～5.
7. integrated bioreactor is handled the method for high concentrated organic wastewater, the steps include:
(1) when temperature is 5～15 ℃, waste water is from the water-distributing device water inlet of UASB bottom, the water-distributing device top is provided with mechanical stirring device and fully stirs, the biogas, anaerobic sludge and the water that generate separate through triphase separator, biogas enters collection chamber, sludge settling is gone into the UASB reaction zone, flow to the reactor head water outlet on the 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;
(3) waste water continues the upper reaches, through the MBBR aerating apparatus, mixes with gas, and gas, water fully contact with the filler of fluidized state then, and 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 the integrated bioreactor, can be with effluent recycling to the reactor inlet place.
8. integrated bioreactor according to claim 7 is handled the method for high concentrated organic wastewater, it is characterized in that closing under the mechanical stirring device normal circumstances of UASB bottom in the step (1), stirs when UASB water outlet pH＜6.8.
9. integrated bioreactor according to claim 8 is handled the method for high concentrated organic wastewater, it is characterized in that adding the floating stuffing that proportion is 0.93-0.99 among the MBBR in the step (3), filling ratio is 40%-60%, and aeration rate need guarantee that dissolved oxygen content is 2mg/L-4mg/L.
10. integrated bioreactor according to claim 9 is handled the method for high concentrated organic wastewater, it is characterized in that the middle MBBR effluent recycling of step (4) to the reflux ratio of UASB is 100%-300%, reflux ratio is 100% when UASB water outlet pH is 6.8～7.5, increases reflux ratio when pH＜6.8.
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