CN100431671C - Bio-trickling device for processing volatile organic waste gas and method thereof - Google Patents
Bio-trickling device for processing volatile organic waste gas and method thereof Download PDFInfo
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- CN100431671C CN100431671C CNB2006101655576A CN200610165557A CN100431671C CN 100431671 C CN100431671 C CN 100431671C CN B2006101655576 A CNB2006101655576 A CN B2006101655576A CN 200610165557 A CN200610165557 A CN 200610165557A CN 100431671 C CN100431671 C CN 100431671C
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Abstract
The invention relates to a biological drop filter and relative method for treating volatile organic waste gas, wherein it comprises that: feeding volatile organic waste gas into gas inlet tube (1) and main body (7) of reactor to be degraded and purified to be discharged from ventilate tube (9); the nutriment (11) enters into main body (7) via the nutriment distributor (18); the invention is characterized in that: the entrance of volatile organic waste gas is along the horizontal central line of main body 97); the nutriment (11) flows along the main body (7) from up to down, to form gas-liquid alternative contact in the main body (7). The invention can strengthen the biological degrade ability, with small area.
Description
Technical field
The present invention relates to a kind of bio-trickling device and method of handling volatile organic waste gas, belong to the process field of volatile organic waste gas.
Background technology
(Volatile Organic Compounds is a big class gaseous organic pollutant hereinafter to be referred as VOCs to VOC, mainly is meant at normal temperatures saturated vapour pressure approximately greater than 70Pa, and boiling point is less than 260 ℃ organic compound under the normal pressure.VOCs is of a great variety, and it is wide to distribute, and toxicity is big.The VOCs source exhaust gas is extensive, the part come from large-scale stationary source (as petrochemical industry, waste water disposal facility, pharmacy etc., the leakage at valve, pump place, the storage of low boiling organic compound, transportation etc.; In a large number from the vehicles, electroplate, spray paint and institute's exhaust gas discharged such as organic solvent use, have pollute wide, large-minded, characteristics such as concentration is low.Under the intense UV rays effect, photochemical reaction takes place in VOCs and nitrogen oxide, hydrocarbon etc., generates photochemical fog; The infrared ray that absorbs terrestrial surface radiation causes greenhouse effects; Halohydrocarbon VOCs also can damage the ozone layer and form the ozone cavity; Some VOCs also has three causing property (carcinogenic, aberration inducing, mutagenesis, toxicity, foul smell in addition.The VOCs exhaust emission is increasingly extensive, is on the rise.It not only serious harm existent environment of people, and all the time do not encroaching on human healthy.
Bioanalysis is a kind of processing method of rising over nearly 20 years, being directed to this class had not only had the purified treatment of the industrial low concentration VOCs waste gas of recovery value but also serious environment pollution, mainly, the VOCs in the waste gas is converted into simple inorganic matter (CO by the metabolic activity of microorganism
2, the process of water etc. and cell component.Bioanalysis can be divided into biological washing method, biofiltration process and bio-trickling method.The bio-trickling method has been improved some problems that the traditional biological filtration method is in operation and runs into, as filler degraded need to upgrade, acidifying causes that pH value reduces, waste gas humidity is low makes filler mummification etc., becomes a kind of VOCs purification method that Recent study is enlivened the most.
The equipment that the bio-trickling method generally adopts is that vertical bio-trickling filter is (as Fig. 1, drip the porous aggregate bed that has certain altitude in the filter tower, nutrient solution gets off from the top spray that drips the filter tower filler, and flow through the filler that drips filter tower step by step, need purifying exhaust air to enter by dripping filter tower bottom or top, liquid and gas can flow in the mode of adverse current or following current contact in the packed bed of porous, and the waste gas after the purification is discharged at the bottom of by cat head or tower.The biology of apposition growth as carbon source, carries out self growth and breeding with nutrient solution as nitrogenous source with VOCs on the filler.Disclose patents of some relevant bio-trickling filters in recent years, disclose as patent 200410013545.2 and a kind of used the bio-trickling filter deodorization device more, integrated foul smell and sewage disposal function.Patent 200510095104.6 also discloses a kind of bio-trickling filter that is used for removing the air odorant pollutant, and it has adopted the filler of different size to fill a filter tower.Yet, owing to drip filter tower certain altitude is arranged, nutriment is along with tower height is absorbed by microorganism in the nutrient solution, CONCENTRATION DISTRIBUTION will reduce along with tower axis, thereby can not guarantee the distributing homogeneity of nutrient solution, promptly cause humidity and biomass skewness in the filter tower, effectively reduce in the degraded space, influenced its removal effect, produced the pressure drop height, susceptible to plugging problem, the existence of these problems has increased equipment volume and investment cost, makes troubles to operational administrative, limited the further application of bio-trickling filter in industrial reality greatly, above-mentioned disclosed bio-trickling filter patent all exists these problems.The bio-trickling device of the improvement stench that patent ZL200420085369.9 provides, can be vertical cylinder or horizontal rectangular configuration, its horizontal rectangular configuration device is seen Fig. 2, device is divided into the chamber of 4 series connection by deflection plate, gas baffling up and down contacts with following current with the liquid alternated adverse current of carrying out by whole device.In fact this be equivalent to several bio-trickling filters are contacted, the uniformity that air-flow distributes in device can not guarantee, exists the dead angle too many, is not easy to make the biomembrane that comes off in time to get rid of, easily stop up, problem such as pressure drop height, stop up comparatively difficulty of back backwash operation.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of bio-trickling device and method of handling volatile organic waste gas, reduced the height of flowing through of nutrient solution, gas-liquid mass transfer and biodegradability have been strengthened, it is little to have floor space, the characteristics that biomembrane stops up can not appear in convenient operation and management, long-time running.
A kind of bio-trickling method of handling volatile organic waste gas, volatile organic waste gas enters reactor body 7 by air inlet pipe 1, is attached in reactor body 7 after the purification of the microbial degradation on the porous aggregate 4, to be discharged by blast pipe 9; The nutrient solution 11 that growth of microorganism desired nutritional material is provided drips distribution apparatus 18 by nutrient solution at regular time and quantity and enters into reactor body 7 by nutrient solution automatic ration feedway 17; It is characterized in that: the entering and discharge along the horizontal center line of reactor body 7 of volatile organic waste gas, nutrient solution 11 is flowed from top to bottom by reactor body 7 tops, forms gas, liquid cross-flow contact in reactor body 7.
A kind of bio-trickling device of handling volatile organic waste gas comprises that air inlet pipe 1, reactor body 7, nutrient solution automatic ration feedway 17, nutrient solution drip distribution apparatus 18, liquid seal device 5 and blast pipe 9; Reactor body 7 inner fillings can attached biological film porous aggregate 4, nutrient solution drips the top that distribution apparatus 18 is positioned at reactor body 7, be made up of shower 19 and water-locator 20, liquid seal device 5 is positioned at the bottom of reactor body 7, is connected to form with U type liquid sealing pipe 10 by cone-shaped collection district 6; Nutrient solution automatic ration feedway 17 is connected to form successively by liquid reserve tank 12, water pump 13, constant volume device 16 and magnetic valve 15, links to each other with U type liquid sealing pipe 10 by liquid reserve tank 12, links to each other with shower 19 by magnetic valve 15; It is characterized in that: air inlet pipe 1 and blast pipe 9 lay respectively at the both sides of reactor body 7, three's horizontal center line overlaps, be provided with flaring inlet duct 3 and water conservancy diversion district 22 between air inlet pipe 1 and the reactor body 7, be provided with water conservancy diversion district 22 and convergent exhaust apparatus 8 between reactor body 7 and the blast pipe 9.
Described flaring inlet duct 3 and convergent exhaust apparatus 8 are the truncated rectangular pyramids of horizontal positioned, and four sides are trapezoidal, and the upper and lower side of horizontal positioned terrace with edge and horizontal plane angle scope are 30 °-60 °.
On described air inlet pipe 1 and described blast pipe 9, be respectively arranged with pressure measurement sample tap 2.
Described water-locator 20 is for bilayer and be provided with compartment 21 between this bilayer.
By 23 controls of a micro computer time controller, constant volume device 16 is provided with nutrient solution return duct 24 and communicates with liquid reserve tank 12 respectively for water pump 13 and magnetic valve 15.
The present invention has following beneficial effect:
(1) volatile organic waste gas contacts with nutrient solution cross-flow in this reactor body, reduced the height of flowing through of nutrient solution, and vertically evenly distributing, increased the removal load-bearing capacity of unit volume filler, strengthen gas-liquid mass transfer and biodegradability, thereby made full use of the useful space of bio-trickling filter.
(2) structure Design has guaranteed the uniformity that gas distributes in reactor, inlet, outlet can regularly be changed, thereby the uniformity that biomass distributes in the assurance reactor body, reactor for treatment is large-minded, and floor space is little, convenient operation and management, the installation site is flexible, both operations on the ground can be placed on the subsurface thermostat layer again, and environmental condition (as humidity etc.) is easy to control.
(3) be respectively arranged with the pressure measurement sample tap on air inlet pipe and the blast pipe, temperature, humidity change before and after the handling property of assaying reaction device, pressure drop and the reactor timely and accurately.
(4) structure of layer cloth hydrophone and compartment had both reached the purpose of even cloth liquid, had prevented that again gas is from reactor body top problem of short-circuit.
(5) by the supply of control nutrient solution, controlled temperature, humidity and biomembranous accumulation in the reactor body preferably, guaranteed the stability of reactor for treatment performance, biomembrane can not appear in long-time running to be stopped up, and need not backwash, has saved energy consumption.
Description of drawings
Fig. 1 is a traditional biological trickling filtration treatment process device schematic diagram.
Among the figure: the 1-air inlet pipe; The 4-filler; The 7-reactor body; The 9-blast pipe; The 26-spray equipment; 27-nutrient solution inlet; The outlet of 28-nutrient solution
The horizontal rectangular devices schematic diagram of the improvement stench that Fig. 2 provides for patent ZL200420085369.9.
Among the figure: the 1-air inlet pipe; The 7-reactor body; The 9-blast pipe; The 25-deflection plate; The 26-spray equipment; 27-nutrient solution inlet; The outlet of 28-nutrient solution
Fig. 3 handles the bio-trickling device structural representation of volatile organic waste gas for the present invention.
Among the figure: the 1-air inlet pipe; 2-pressure measurement sample tap; 3-flaring inlet duct; The 4-filler; The 5-liquid seal device; 6-cone-shaped collection district; The 7-reactor body; 8-convergent exhaust apparatus; The 9-blast pipe; 10-U type liquid sealing pipe; The 11-nutrient solution; The 12-liquid reserve tank; The 13-water pump; The 14-feed tube; The 15-magnetic valve; 16-constant volume device; 17-nutrient solution automatic ration feedway; The 18-nutrient solution drips distribution apparatus; The 19-shower; The 20-water-locator; The 21-compartment; 22-water conservancy diversion district; 23-micro computer time controller; The 24-return duct
Fig. 4 is that the biofilm of bio-trickling device starts ruuning situation.
Fig. 5 moves the situation of handling volatile organic waste gas continuously for bio-trickling device.
The specific embodiment
The bio-trickling device of processing volatile organic waste gas shown in Figure 3 drips distribution apparatus 18, liquid seal device 5 and blast pipe 9 by air inlet pipe 1, reactor body 7, nutrient solution automatic ration feedway 17, nutrient solution and forms.This bio-trickling device overall appearance is horizontal, air inlet pipe 1 and blast pipe 9 lay respectively at the both sides of reactor body 7, three's horizontal center line overlaps, air inlet pipe 1 is by flaring inlet duct 3, water conservancy diversion district 22 joins with reactor body 7, and blast pipe 9 is by water conservancy diversion district 22, convergent exhaust apparatus 8 joins with reactor body 7, structure Design is suitable for handling the volatile organic waste gas of atm number, flaring inlet duct 3 is the truncated rectangular pyramids of horizontal positioned with convergent exhaust apparatus 8, four sides are trapezoidal, on the horizontal positioned terrace with edge, downside and horizontal plane angle scope are 30 °-60 °, water conservancy diversion district 22 is detachable, length and reactor body 7 length ratios are 1: 5, played the effect of even gas distribution, device advances, the gas outlet can regularly be changed, thereby the uniformity that biomass distributes in the assurance reactor body, convergent exhaust apparatus 8 have then played the effect of gas after the good collection and treatment.On air inlet pipe 1 and blast pipe 9, be respectively arranged with pressure measurement sample tap 2, the effect of playing is that temperature before and after handling property, pressure drop and the reactor that can measure this bio-trickling device timely and accurately, humidity change, thereby helps controlling the operation of this bio-trickling device.Being filled with in reactor body 7 inside can the biomembranous porous aggregate 4 of apposition growth, the nutrient solution that is positioned at reactor body 7 tops drips distribution apparatus 18 and comprises shower 19 and layer cloth hydrophone 20, and between this layer cloth hydrophone 20, be provided with compartment 21, water-locator 20 adopts double-decker, both can be more effective even cloth liquid, can also be used to solving and prevent that gas is from this problem of top short circuit, the seal of assurance device.Reactor body 7 bottoms are the liquid seal device 5 that 6 bottoms, cone-shaped collection district are connected with U type liquid sealing pipe 10 and form, U type liquid sealing pipe 10 1 ends are immersed in the liquid reserve tank 12, liquid reserve tank 12, water pump 13, constant volume device 16 is connected successively with magnetic valve 15, formed nutrient solution automatic ration feedway 17, liquid reserve tank 12 links to each other with water pump 13 imports, water pump 13 outlets link to each other with constant volume device 16 tops by feed tube 14, constant volume device 16 bottoms link to each other with magnetic valve 15, magnetic valve links to each other with the shower 19 that is positioned at reactor body 7 tops, not only guaranteed whole bio-trickling device good air-tightness, the structure in the cone-shaped collection district 6 biomembranous discharge that helps coming off simultaneously, make that the pressure drop of whole bio-trickling device is lower, be not prone to biomembrane and stop up, can save the backwash expense, reduce operating cost and initial investment.Temperature constant temperature is adjustable in the liquid reserve tank 12, be provided with the control that micro computer time controller 23 carries out water pump 13 and magnetic valve 15, constant volume device 16 sides are provided with nutrient solution return duct 24 and communicate with liquid reserve tank 12, convenient operation and management, control temperature, humidity and biomembranous accumulation in the reactor body preferably, guaranteed the stability of reactor long-time running handling property.
Volatile organic waste gas is successively by air inlet pipe 1, flaring inlet duct 3, water conservancy diversion district 22, level enters in the reactor body 7, in reactor body 7, be filled with the porous aggregate 4 that can adhere to biology with degradation capability, nutrient solution 11 provides this required nitrogenous source of growth of microorganism with degradation capability, the nutrient solution automatic ration feedway 17 of nutrient solution 11 by connecting to form successively by liquid reserve tank 12, water pump 13, constant volume device 16 and magnetic valve 15, the self-timing nutrient solution of flowing through quantitatively drips distribution apparatus 18, finally enters into reactor body 7.Water pump 13 is controlled by micro computer time controller 23 automatically with the open and close of magnetic valve 15, water pump 13 is opened back nutrient solution 11 and is entered in the constant volume device 16 by top by feed tube 14, when nutritious liquid 11 flows out in the return duct 24, water pump 13 cuts out automatically, magnetic valve 15 is opened automatically then, nutrient solution 11 with certain volume and preference temperature just drips distribution apparatus 18 by nutrient solution and has been added drop-wise to equably in the reactor body 7, and magnetic valve 15 cuts out automatically.Nutrient solution drips distribution apparatus 18 and comprises shower 19 and layer cloth hydrophone 20, and shower 19 and layer cloth hydrophone 20 are all in the top seal space of reactor body 7.Nutrient solution splashes in the reactor body 7 from top to bottom equably, the volatile organic waste gas cross-flow that enters into reactor body 7 with level contacts, attached to the microorganism that has degradation capability on the porous aggregate 4 with nutrient solution 11 and volatile organic waste gas as the needed matrix of self growth and breeding, so, pollutant in the waste gas has obtained degraded, after utilizing the gas after water conservancy diversion district 22 and 8 collection and purification of convergent exhaust apparatus, discharge by blast pipe 9.The biomembrane that comes off and remain nutrient solution on a small quantity and then enter into the cone-shaped collection district 6 that is arranged in reactor body 7 bottoms finally enters liquid reserve tank 12.Gas, liquid cross-flow contact have reduced the height of flowing through of nutrient solution, and have vertically evenly distributed, gas-liquid mass transfer and biodegradability have been strengthened, increased the removal load-bearing capacity of unit volume filler, made full use of the useful space of bio-trickling filter, the reactor floor space is little, convenient operation and management, the installation site is flexible, and both operations on the ground can be placed on the subsurface thermostat layer again, environmental condition (as humidity etc.) is easy to control, handles large-minded.
Handle certain volatile organic waste gas, wherein toluene concentration is 967-1390mg/m
3, the time of staying in this bio-trickling device is 24s, belongs to low concentration atm number waste gas.Temperature changes with variation of ambient temperature, and excursion is 17-28 ℃, and inlet concentration fluctuates within the specific limits, the long-term operation continuously of this reactor.Haydite after loading fillers in the reactor body 7 and be preferably, porous and have bigger specific area.
The biomembrane bacterium source that filling surface adheres to is a pseudomonas putida.To prepare bacteria suspension and splash in the filler 4, the beginning microbe inoculation regularly splashes into nutrient solution in reactor body 7, feed waste gas simultaneously in reactor body 7.Bacterial adhesion in the bacteria suspension begins growth and breeding at filling surface, and forms biomembrane gradually.By regularly carrying out the toluene concentration analytical test, to remove the detergent power that efficient reflects system from 2 samplings of pressure measurement sample tap.
Figure 4 shows that this bio-trickling device biofilm starts situation.Bacterium adds the initial stage, the startup stage that whole system being in biofilm, continuous breeding growth along with microorganism, filling surface engenders the milky biomembrane, color is deepened gradually, be faint yellow, as shown in Figure 4, the removal efficient of this device is by 11% increase gradually that starts the 1st day, reached 80% at the 6th day, and continue to increase and to reach stable, to remove efficient and maintain more than 90%, biofilm starts to be finished, biofilm start-up time drip filter tower two all biofilms and shorten a week nearly start-up time than traditional biological, bimestrial afterwards in service continuously, the device handling property is comparatively stable, as shown in Figure 5, use this bio-trickling device after biofilm successfully starts, volatile organic waste gas is handled in operation continuously, and it on average removes efficient is 97%, and the maximum removal of unit volume filler load-bearing capacity is 253.2g/m
3H, the detected toluene concentration of exit gas all is lower than " discharge standard of air pollutants " (maximal emission of stipulating among the GB16297-1996.
The rational nutrient solution of reasonable structural design and nutrient solution automatic ration feed system is supplied with, make that the interior biomass of reactor is comparatively stable, the biomembrane that comes off can in time be discharged, the pressure drop of whole system is all below 10Pa, the carrier biofilm blockage problem does not appear, do not need backwash, be suitable for handling the industrial volatile organic waste gas of low concentration atm number.
The present invention is not limited to the above-mentioned specific embodiment, as long as volatile organic waste gas lateral flow in reactor body, volatile organic waste gas contacts with nutrient solution cross-flow in reactor body, all drops within protection scope of the present invention.
Claims (6)
1. bio-trickling method of handling volatile organic waste gas, volatile organic waste gas enters reactor body (7) by air inlet pipe (1), be attached in reactor body (7) and after the purification of the microbial degradation on the porous aggregate (4), discharge by blast pipe (9); The nutrient solution (11) that growth of microorganism desired nutritional material is provided drips distribution apparatus (18) by nutrient solution at regular time and quantity and enters into reactor body (7) by nutrient solution automatic ration feedway (17); It is characterized in that: the entering and discharge along the horizontal center line of reactor body (7) of volatile organic waste gas, nutrient solution (11) is flowed from top to bottom by reactor body (7) top, forms gas in reactor body (7), the liquid cross-flow contacts.
2. a bio-trickling device of handling volatile organic waste gas comprises that air inlet pipe (1), reactor body (7), nutrient solution automatic ration feedway (17), nutrient solution drip distribution apparatus (18), liquid seal device (5) and blast pipe (9); The inner filling of reactor body (7) can attached biological film porous aggregate (4), nutrient solution drips the top that distribution apparatus (18) is positioned at reactor body (7), form by shower (19) and water-locator (20), liquid seal device (5) is positioned at the bottom of reactor body (7), is connected to form by cone-shaped collection district (6) and U type liquid sealing pipe (10); Nutrient solution automatic ration feedway (17) is connected to form successively by liquid reserve tank (12), water pump (13), constant volume device (16) and magnetic valve (15), link to each other with U type liquid sealing pipe (10) by liquid reserve tank (12), link to each other with shower (19) by magnetic valve (15); It is characterized in that: air inlet pipe (1) and blast pipe (9) lay respectively at the both sides of reactor body (7), three's horizontal center line overlaps, be provided with flaring inlet duct (3) and water conservancy diversion district (22) between air inlet pipe (1) and the reactor body (7), be provided with water conservancy diversion district (22) and convergent exhaust apparatus (8) between reactor body (7) and the blast pipe (9).
3. according to the described a kind of bio-trickling device of handling volatile organic waste gas of claim 2, it is characterized in that: described flaring inlet duct (3) and convergent exhaust apparatus (8) are the truncated rectangular pyramids of horizontal positioned, four sides are trapezoidal, and the upper and lower side of horizontal positioned terrace with edge and horizontal plane angle scope are 30 °-60 °.
4. according to the described a kind of bio-trickling device of handling volatile organic waste gas of claim 2, it is characterized in that: on described air inlet pipe (1) and described blast pipe (9), be respectively arranged with pressure measurement sample tap (2).
5. according to the described a kind of bio-trickling device of handling volatile organic waste gas of claim 2, it is characterized in that: described water-locator (20) is for bilayer and be provided with compartment (21) between this bilayer.
6. according to the described a kind of bio-trickling device of handling volatile organic waste gas of claim 2, it is characterized in that: by a micro computer time controller (23) control, constant volume device (16) is provided with nutrient solution return duct (24) and communicates with liquid reserve tank (12) respectively for water pump (13) and magnetic valve (15).
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| CN103041697B (en) * | 2013-01-17 | 2014-12-31 | 南京工业大学 | Biological trickling filter for treating volatile organic waste gas |
| CN103263846B (en) * | 2013-06-04 | 2015-04-08 | 天津大学 | Reaction device and method for treating high temperature organic waste gas based on thermophilic bacteria biotechnology |
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| CN1994533A (en) | 2007-07-11 |
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