CN105152256B - A kind of fixation packed bed aeration stripping system and method for being used to remove underground water carbon tetrachloride - Google Patents
A kind of fixation packed bed aeration stripping system and method for being used to remove underground water carbon tetrachloride Download PDFInfo
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- CN105152256B CN105152256B CN201510662436.1A CN201510662436A CN105152256B CN 105152256 B CN105152256 B CN 105152256B CN 201510662436 A CN201510662436 A CN 201510662436A CN 105152256 B CN105152256 B CN 105152256B
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- aeration stripping
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Abstract
The invention discloses a kind of fixation packed bed aeration stripping system for being used to remove underground water carbon tetrachloride, including aeration stripping pond, fixed packed bed and aerating system, arranging multiplayer fixes packed bed in aeration stripping pond, bottom sets aerating system, aerating system uses microporous aeration disc, is connected by air inlet with external air source；Mechanical dust removal and tail gas collecting device are set at the top of aeration stripping pond, and its side wall top and the bottom is respectively equipped with water inlet and delivery port；Fixed packed bed is using the reducing substances filler for loading iron particle.Enter aeration stripping pond from top the invention also discloses a kind of method that underground water carbon tetrachloride is removed using the system, including raw water；Adjust gas-water ratio and aeration intensity；Determine aeration quantity；By carbon tetrachloride stripping；Carbon tetrachloride collection is handled；Treated water enters water outlet after clear water reserviors sterilization.The present invention can improve 20% to the removal effect of carbon tetrachloride, and Construction and operation cost is low, and water quality meets national standard.
Description
Technical field
The present invention relates to a kind of removing system and method for underground water source water supply plant Carbon Tetrachloride Contamination thing, particularly underground
The efficient of water source water supply plant, low consumption, the fixed bed padding aeration stripping carbon tetrachloride processing method of no coupling product, belong at feedwater
Manage technical field.
Background technology
Underground water accounts for the 22.6% of global freshwater resources total amount, and the people in the whole world 1/4 is using underground water as drinking water source.China has
400 city exploiting groundwaters, the quantity delivered of underground water has accounted for the 20% of national total supply, in vast rural area
Lower water more turns into main drinking water source.
69 urban groundwater organic contaminations of national 31 provinces, which are detected, to be shown, the higher group of recall rate in organic pollution
Divide predominantly chlorohydrocarbon, detection frequency is higher for carbon tetrachloride, chloroform etc..Carbon tetrachloride quite stable in underground water, very
Hardly possible is decomposed, and is typical hepatotoxic agent, during high concentration, is influence central nervous system first, is then influenceed liver, kidney；And it is low dense
Degree Long Term Contact then mainly shows the infringement to liver, kidney, is classified as 129 kinds " priority pollutants blacklists in water " by the U.S.
Among 68 kinds of China " priority pollutants blacklist in water ".
The method that Carbon Tetrachloride Contamination is administered in domestic and international underground water mainly includes showering technology and in-situ immobilization skill
Art：Showering refers to by extraction system collect contaminant water to earth's surface, then takes measures to be handled again, mainly includes
It is passive to collect and pump-and-treat system；In-situ immobilization is not transported then to pollutant, but is carried out under its environmental condition having
Repair, mainly include permeability response grid, aeration process, chemical oxidation techniques, bioremediation technology, electric repairing technique
Deng.
In view of financial cost and water supply security, the technical measures that water supply plant can be used for active carbon adsorption technology,
Biological Pretreatment Techniques and aeration stripping technology：1) active carbon adsorption technology --- activated carbon is a kind of good water treatment agent, can
Carbon tetrachloride in activated carbon filter, Adsorption water is set up in water factory, but charcoal absorption is easily saturated, it is necessary to regularly replace,
Financial cost is high；2) Biological Pretreatment Techniques --- biochemical treatment mainly using the metabolism of microorganism come carbon tetrachloride of degrading,
The biochemical reaction commonly required time is longer, and because nutriment is less in underground water, microorganism can not obtain abundant nutrition, it is impossible to
Amount reproduction, it is impossible to reach good removal effect；3) aeration stripping technology --- aeration stripping is owned by France in physical method, can be
It is to utilize the difference in water between the actual concentrations and equilibrium concentration of dissolved compound that water factory, which sets up aeration stripping pond, by volatility
Component is constantly diffused into gas phase by liquid phase, reaches the purpose for removing volatile organic matter.
Comprehensive Correlation can be seen that aeration stripping technology has certain advantage compared with other processing methods, be mainly to use stripping
The form of tower, but it is costly in the presence of building, and operating cost is high, and secondary pollution problem is mainly used in sewage treatment area.Therefore,
Existing aeration stripping technological treatment, technological parameter are not suitable for underground water source water supply plant, and underground water source water supply plant lacks
The removing process method of the carbon tetrachloride of simple and effective.
The content of the invention
The technical problems to be solved by the invention are that the defect existed for prior art feeds water there is provided a kind of underground water source
Carbon tetrachloride in the removing process method of factory's Carbon Tetrachloride Contamination thing, effectively removing water body, it is ensured that effluent quality meets country
《Standards for drinking water quality》(GB5749-2006).
To solve this technical problem, the invention provides a kind of fixation packed bed for being used to remove underground water carbon tetrachloride
Arranging multiplayer is fixed in aeration stripping system, including aeration stripping pond, fixed packed bed and aerating system, the aeration stripping pond
Packed bed, its bottom sets aerating system, and aerating system uses microporous aeration disc, is connected by air inlet with external air source；Institute
State and mechanical dust removal and tail gas collecting device are set at the top of aeration stripping pond, its side wall upper part and bottom are respectively equipped with water inlet
And delivery port；The fixed packed bed is using the reducing substances filler for loading iron particle.
The aeration stripping pond is using formula structure of prancing, and point three-level, current upper entering and lower leaving, submersion depth is not less than 3m.
The fixed packed bed sets 3-4 layers, per thickness degree 200mm-300mm；The fixed packed bed uses load iron
The spherical suspending filling material of grain, filler diameter 100mm, proportion 0.92-0.95g/cm3, packed density 50%-80%.
The aerating system point three-level, every grade individually can measure and control, using microporous aeration disc, under water 0.5m-1m,
The bubble diameter of generation is 1mm~3mm；The port of export of the aerating system sets and sets gas in vent valve, every lattice air inlet pipe
Flowmeter, aeration stripping bottom of pond portion arranges gas distribution pipeline in rich font.
The mechanical dust removal uses axial-flow exhaust fan, the gas outlet installed in aeration stripping pond top, aeration stripping
Air pressure monitoring device is also set up at the top of pond body, is linked with mechanical dust removal.
Described exhaust gas processing device is arranged on the top of mechanical dust removal, using coal mass active carbon, and grain diameter >=
5mm, Penetrating curve >=70%, packed height is 800-1000mm.
Chlorination point is provided with the end of aerating system.
Present invention also offers a kind of method for removing underground water carbon tetrachloride using fixed packed bed aeration stripping system,
Specifically include following steps：
1) contaminated carbon tetrachloride raw water current upper entering and lower leaving, enters aeration stripping pond from top water inlet, and waterpower is stopped
It is 10min-30min to stay the time, and submersion depth is not less than 3m；
2) according to the evolution with distance of pollutant concentration in aeration stripping pond, regulation gas-water ratio and aeration intensity；
3) aeration quantity is determined according to gas-water ratio and aeration intensity；
4) microbubble that bottom aerating system is produced inversely is contacted with polluted water, and layered arrangement consolidates in aeration stripping pond
The bubble assembled in uphill process is cut microbubble by fixed bed filler again, and polluted water is evenly distributed, by carbon tetrachloride
Stripping comes out；
5) carbon tetrachloride overflowed is handled by aeration stripping Chi Ding mechanical dust removal and tail gas collecting device；
6) delivery port of the treated water in aeration stripping pond body bottom flows out, water outlet after being sterilized into clear water reserviors.
The step 2) gas-water ratio and aeration intensity determine that carbon tetrachloride clearance is by pollutant initial concentration
50%th, 80% and 90% when, required gas-water ratio is respectively 1,2 and 3, aeration intensity be 6-8L/ (m2·h)。
Described aeration quantity is according to gas-water ratio and aeration intensity determination, the gas stream by vent valve and in air inlet pipe
Gauge adjusts gas-water ratio.
Beneficial effect：The difficult volatile organic contaminant in part can be reduced to by the present invention using the filler of load iron particle
Volatile organic matter, compared to simple aerating system, fixed packed bed aeration stripping system can to the removal effect of carbon tetrachloride
20% is improved, so as to improve its removal efficiency, more conventional stripping tower construction and operating cost are substantially reduced, and easily realize engineering
Change application, aerating system power consumption and air demand are significantly reduced；It can not only effectively remove the carbon tetrachloride in water body, Er Qieneng
Pollution of the carbon tetrachloride effectively discharged after solution aeration stripping to environment, can tackle the carbon tetrachloride of various concentrations in water body
Pollution problem, it is ensured that effluent quality meets country《Standards for drinking water quality》(GB5749-2006).
Brief description of the drawings
Fig. 1 is the structural representation in aeration stripping pond of the present invention.
In figure：Packed bed, 3 aerating systems, 4 water inlets, 5 delivery ports, 6 air inlet pipe, 7 machineries are fixed in 1 aeration stripping pond, 2
Exhaust system.
Embodiment
Below in conjunction with the accompanying drawings and embodiment is specifically described to the present invention.
Fig. 1 show the structural representation in aeration stripping pond of the present invention.
It is many that the present invention includes arrangement in aeration stripping pond 1, fixed packed bed 2 and aerating system 3, the aeration stripping pond 1
The fixed packed bed 2 of layer, its bottom sets aerating system 3, and aerating system 3 uses microporous aeration disc, passes through air inlet 6 and outside gas
Source is connected；The top of aeration stripping pond 1 sets mechanical dust removal 7 and tail gas collecting device, its side wall upper part and lower part
She You not water inlet 4 and delivery port 5；The fixed packed bed 2 is using the reducing substances filler for loading iron particle.
The aeration stripping pond 1 is using formula structure of prancing, point three-level, current upper entering and lower leaving, and hydraulic detention time is
10min-30min, submersion depth is not less than 3m.
The fixed packed bed 2 sets 3-4 layers, per thickness degree 200mm-300mm；The fixed packed bed 2 is using spherical outstanding
The reducing substances, filler diameter 100mm, proportion 0.92-0.95g/cm such as load iron particle on floating filler, filler3, packed density
50%-80%.
Described 3 points of three-levels of aerating system, every grade individually can measure and control, according in pond body pollutant concentration along journey
Change, regulation gas-water ratio and aeration ratio.
The aerating system 3 uses microporous aeration disc, under water 0.5m-1m, and the bubble diameter of generation is 1mm~3mm.
The port of export of the aerating system 3 sets and sets gas flowmeter in vent valve, every lattice air inlet pipe, for adjusting gas
Gas distribution pipeline is arranged in water ratio, the bottom of aeration stripping pond 1 in rich font.
The mechanical dust removal 7 uses axial-flow exhaust fan, and the gas outlet installed in the top of aeration stripping pond 1, aeration blows
Air pressure monitoring device is also set up at the top of the de- body of pond 1, is linked with mechanical dust removal 7, accelerates carbon tetrachloride gas in clear water reserviors
Escape speed.
Described exhaust gas processing device is arranged on the top of mechanical dust removal 7, using coal mass active carbon, and grain diameter >=
5mm, Penetrating curve >=70%, packed height is 800-1000mm, the carbon tetrachloride gas escaped for adsorbing from water
Body, prevents the pollution to surrounding environment.
Chlorination point, influence of the reduction aeration to Disinfection Effect are provided with the end of aerating system 3.
The layering filler of fixed packed bed 2 and micro- aeration of microporous aeration disc are that present invention removing carbon tetrachloride effect is good
Bad key, filler is by the way of multi-tier arrangement, and raw water is fully contacted in packing area with bubble, is subtracted using such a arrangement form
The Duan Liu areas of filler are lacked, have added the contact probability of water, gas, film, multi-level company is carried out to the air pocket that aeration plate discharges
Continuous cutting, so as to reduce bubble diameter, increases the contact area of bubble and carbon tetrachloride, improves the removing effect of carbon tetrachloride
Really, and energy-saving effect is good.
The method for removing underground water carbon tetrachloride using fixed packed bed aeration stripping system, specifically includes following steps：
1) contaminated carbon tetrachloride raw water current upper entering and lower leaving, enters aeration stripping pond 1, waterpower from top water inlet 4
Residence time is 10min-30min, and submersion depth is not less than 3m；
2) according to the evolution with distance of pollutant concentration in aeration stripping pond 1, regulation gas-water ratio and aeration intensity；
3) aeration quantity is determined according to gas-water ratio and aeration intensity；
4) microbubble that bottom aerating system 3 is produced inversely is contacted with polluted water, layered arrangement in aeration stripping pond 1
The bubble assembled in uphill process is cut microbubble by the filler of fixed bed 2 again, and polluted water is evenly distributed, by four chlorinations
Carbon stripping comes out；
5) at the mechanical dust removal 7 and tail gas collecting device that the carbon tetrachloride overflowed passes through aeration stripping Chi1Ding
Reason；
6) delivery port 5 of the treated water in the body bottom of aeration stripping pond 1 flows out, water outlet after being sterilized into clear water reserviors.
The step 2) gas-water ratio and aeration intensity determine that carbon tetrachloride clearance is by pollutant initial concentration
50%th, 80% and 90% when, required gas-water ratio is respectively 1,2 and 3, aeration intensity be 6-8L/ (m2·h)。
Described aeration quantity is according to gas-water ratio and aeration intensity determination, the gas stream by vent valve and in air inlet pipe
Gauge adjusts gas-water ratio.
Embodiments of the invention
Certain water factory's raw water uses underground water, the m of design scale 50,0003/ d, primarily now technological process is deep-well pump house+clear water
Pond+absorbing well, absorption well+booster pump chamber, wherein clear water reserviors two, the volume of single seat clear water reserviors is 4000m3, clear water reserviors planar dimension is
36m × 36m, available depth is 3.2m, and sterilization uses disinfection by chlorine dioxide.Found in water quality monitoring in recent years, four chlorinations
Carbon is exceeded more serious, and concentration need to carry out technological transformation in 2 μ g/L-10 μ g/L to it, be embodied as follows.
(1) newly-built one, air blast computer room, 10.8 × 7.8m of planar dimension is used as source of the gas, ginseng using two Roots blowers
Number is：Q=37.5m3/ min, P=39.2kpa, N=37Kw, the port of export of air blower is set sets gas in vent valve, air inlet pipe
Flowmeter body, for adjusting gas-water ratio, gas-water ratio adjustable extent is 2:1-5:1, boring aeration pipe is installed at aeration tank bottom, worn
Hole aeration tube uses annular configuration, the main caliber DN350 of aerating system, and flow velocity is 12m/s, branch diameter DN50, and tubing is
Stainless steel tube, flow velocity is 5m/s.Three layers of new Ball-type packing are arranged in the top of aerating system, per layer height 30cm, filling
Density 60%.6 axial flow blowers, power 0.37KW, air quantity 3000m are set above pond body3/ h, above axial flow blower
1000mm activated carbon adsorption layer.
(2) under the service condition, investigated by the engineering practice of 1 year, as a result show that whole system normal operation goes out
Water water quality is good, and Carbon Tetrachloride Concentration is less than detection limit in water outlet, and unit water producing cost increases by 0.07 yuan/m3, other indexs are equal
Meet《Standards for drinking water quality》(GB5749-2006).
The present invention, can be by the difficult volatile organic contaminant in part using the filler of load iron particle, and being reduced to volatility has
Machine thing, compared to simple aerating system, fixed packed bed aeration stripping system can improve 20% to the removal effect of carbon tetrachloride,
So as to improve its removal efficiency, more conventional stripping tower construction and operating cost are substantially reduced, and are easily realized engineering application, are exposed
Gas system power consumption and air demand are significantly reduced；The carbon tetrachloride in water body can not only be effectively removed, and can effectively be solved
Pollution of the carbon tetrachloride discharged after aeration stripping to environment, the Carbon Tetrachloride Contamination that can tackle various concentrations in water body is asked
Topic, it is ensured that effluent quality meets country《Standards for drinking water quality》(GB5749-2006).
The embodiment above of the present invention, is merely illustrative, be not it is only, it is all within the scope of the present invention or it is equivalent this
Change in the range of invention is by present invention encirclement.
Claims (10)
1. a kind of fixation packed bed aeration stripping system for being used to remove underground water carbon tetrachloride, it is characterised in that：Including aeration
Stripping pond (1), fixed packed bed (2) and aerating system (3), the interior arranging multiplayer of aeration stripping pond (1) fix packed bed
(2), using formula structure of prancing, its bottom sets aerating system (3), and the aerating system (3) divides three-level, and every grade can individually count
Amount and control, using microporous aeration disc, 0.5m-1m under water, the bubble diameter of generation is 1mm~3mm；By air inlet (6) with
External air source is connected；Set at the top of the aeration stripping pond (1) on mechanical dust removal (7) and tail gas collecting device, its side wall
Portion and bottom are respectively equipped with water inlet (4) and delivery port (5)；The fixed packed bed (2) is using the spherical outstanding of load iron particle
Floating filler, filler diameter 100mm, proportion 0.92-0.95g/cm3, packed density 50%-80%.
2. the fixation packed bed aeration stripping system according to claim 1 for being used to remove underground water carbon tetrachloride, it is special
Levy and be：The aeration stripping pond (1) point three-level, current upper entering and lower leaving, submersion depth is not less than 3m.
3. the fixation packed bed aeration stripping system according to claim 1 for being used to remove underground water carbon tetrachloride, it is special
Levy and be：The fixed packed bed (2) sets 3-4 layers, per thickness degree 200mm-300mm.
4. the fixation packed bed aeration stripping system according to claim 1 for being used to remove underground water carbon tetrachloride, it is special
Levy and be：The port of export of the aerating system (3) sets and sets gas flowmeter, aeration stripping in vent valve, every lattice air inlet pipe
Gas distribution pipeline is arranged in pond (1) bottom in rich font.
5. the fixation packed bed aeration stripping system according to claim 1 for being used to remove underground water carbon tetrachloride, it is special
Levy and be：The mechanical dust removal (7) uses axial-flow exhaust fan, the gas outlet installed in aeration stripping pond (1) top, aeration
Air pressure monitoring device is also set up at the top of stripping pond (1) body, is linked with mechanical dust removal (7).
6. the fixation packed bed aeration stripping system according to claim 1 for being used to remove underground water carbon tetrachloride, it is special
Levy and be：Described exhaust gas processing device is arranged on the top of mechanical dust removal (7), using coal mass active carbon, grain diameter
>=5mm, Penetrating curve >=70%, packed height is 800-1000mm.
7. being used for according to claim any one of 1-6 removes the fixation packed bed aeration stripping system of underground water carbon tetrachloride
System, it is characterised in that：The end of aerating system (3) is provided with chlorination point.
8. the fixation packed bed aeration stripping system removing underground water carbon tetrachloride described in a kind of utilization claim any one of 1-7
Method, it is characterised in that specifically include following steps：
1) contaminated carbon tetrachloride raw water current upper entering and lower leaving, enters aeration stripping pond (1), waterpower from top water inlet (4)
Residence time is 10min-30min, and submersion depth is not less than 3m；
2) according to the evolution with distance of aeration stripping pond (1) interior pollutant concentration, regulation gas-water ratio and aeration intensity；
3) aeration quantity is determined according to gas-water ratio and aeration intensity；
4) microbubble that bottom aerating system (3) is produced inversely is contacted with polluted water, aeration stripping pond (1) interior layered arrangement
The bubble assembled in uphill process is cut microbubble by fixed bed (2) filler again, and polluted water is evenly distributed, by tetrachloro
Change carbon stripping to come out；
5) mechanical dust removal and tail gas collecting device that the carbon tetrachloride overflowed is pushed up by aeration stripping pond (1) are handled；
6) delivery port (5) of the treated water in aeration stripping pond (1) body bottom flows out, water outlet after being sterilized into clear water reserviors.
9. the method for removing underground water carbon tetrachloride according to claim 8, it is characterised in that：The step 2) gas
Water ratio and aeration intensity are determined by pollutant initial concentration, when carbon tetrachloride clearance is 50%, 80% and 90%, required gas
Water ratio respectively 1,2 and 3, aeration intensity is 6-8L/ (m2·h)。
10. the method for removing underground water carbon tetrachloride according to claim 8, it is characterised in that：Described aeration quantity root
Determined according to gas-water ratio and aeration intensity, the gas flowmeter regulation gas-water ratio by vent valve and in air inlet pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510662436.1A CN105152256B (en) | 2015-10-14 | 2015-10-14 | A kind of fixation packed bed aeration stripping system and method for being used to remove underground water carbon tetrachloride |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510662436.1A CN105152256B (en) | 2015-10-14 | 2015-10-14 | A kind of fixation packed bed aeration stripping system and method for being used to remove underground water carbon tetrachloride |
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| CN105152256A CN105152256A (en) | 2015-12-16 |
| CN105152256B true CN105152256B (en) | 2017-07-21 |
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| US10272356B2 (en) * | 2016-04-20 | 2019-04-30 | Q.E.D. Environmental Systems, Inc. | Air stripper system and method |
| CN111606429B (en) * | 2020-05-29 | 2022-01-14 | 中国矿业大学 | Spraying aeration treatment system for volatile organic compound polluted underground water |
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| CN100429158C (en) * | 2006-01-23 | 2008-10-29 | 浙江大学 | Method and equipment for removing organic chloride from wastewater |
| CN101898855B (en) * | 2010-07-16 | 2012-02-29 | 华东理工大学 | Integrated ex-situ repair system for underground water polluted by volatile organic compound |
| CN102367187B (en) * | 2011-04-28 | 2013-03-27 | 华东理工大学 | Chlorinated hydrocarbon-polluted underground water blowing oxidation and tail gas treatment process |
| CN205151816U (en) * | 2015-10-14 | 2016-04-13 | 山东省城市供排水水质监测中心 | A fixed bed of packings aeration blows system of taking off for desorption groundwater carbon tetrachloride |
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