CN1211156C - Active carbon fiber regenerating method - Google Patents
Active carbon fiber regenerating method Download PDFInfo
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- CN1211156C CN1211156C CN 02133116 CN02133116A CN1211156C CN 1211156 C CN1211156 C CN 1211156C CN 02133116 CN02133116 CN 02133116 CN 02133116 A CN02133116 A CN 02133116A CN 1211156 C CN1211156 C CN 1211156C
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- nacf
- active carbon
- regeneration
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- reactor
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Abstract
The present invention relates to a method for regenerating active carbon fibers for treating industrial waste water, which comprises: the regeneration is carried out under the voltage of 50 to 220V and the current of 1 to 2 amperes, the active carbon fibers are used as a resistor and heated by current so that adsorbed organisms and smelly chemical substances are quickly desorbed and regenerated. In the regeneration process, air or nitrogen gas can be introduced simultaneously. Compared with the prior art, the method has the advantages of high speed, high efficiency, simple equipment, convenient operation, etc. The method can be used for regenerating various active carbon fibers for treating industrial waste water.
Description
1, technical field
The present invention relates to a kind of renovation process of NACF, particularly handle the NACF of the industrial wastewater renovation process after saturated.
2, background technology
Because NACF has huge specific area and higher external surface area, particularly the micropore of singlet state or mesopore with appropriate ratio mainly are distributed on the outer surface of NACF, eliminated the diffusional resistance of traditional sorbing material control adsorption process, adsorption process can be carried out under very high speed, therefore adopt organic matter and stink chemical substance in this sorbing material absorption industrial wastewater, compare with traditional sorbing material such as active carbon, can not only improve removal effect to low-concentration organic waste water, treatment effeciency is significantly improved, and the rate of adsorption can obtain the increase of tens times and even tens times, make sorbing material reach adsorption equilibrium fast, thereby farthest utilized.
Need regeneration cycle to use after the carbon fiber adsorption and catalytic combustion balance, the renovation process of prior art mainly contains methods such as steam regeneration, solution washing regeneration.US5607595 proposes with a kind of NACF purified tap water, absorption and remove free chlorine in the water, harmful haloform and stink material etc., and renovation process is to the NACF desorption with the water vapour under 100 ℃～120 ℃.Zhao Guang etc. (" handling the research of tridemorph agricultural chemicals waste water with carbon fiber adsorption and catalytic combustion ", chemical industry environmental protection, 1995,15 (3)) propose to handle the tridemorph agricultural chemicals waste water with carbon fiber adsorption and catalytic combustion, carry out desorption and regeneration with ethanol and acid inorganic desorbing agent again; Zhou Lili etc. (" NACF is to the Study on adsorption properties of butyl acetate in the aqueous solution ", Shenyang chemical industry, 1996, (2)) have done the Study on adsorption properties with butyl acetate in the carbon fiber adsorption and catalytic combustion aqueous solution, make butyl acetate vaporization desorption with high steam; Xu Zhida etc. (" NACF Refinery Wastewater prospect ", Treatment of Industrial Water, 1998,18 (2)) use the NACF Refinery Wastewater, with 200 ℃～500 ℃ superheated vapour desorption and regeneration.The solvent wash method of reproduction is not suitable for the NACF of absorption industrial wastewater, because the organic pollutant category in the industrial wastewater is various, generally can reach thousands of kinds, simple one or more solvents can not dissolve all contaminants of absorption, if select several chemical solvent regeneration, the regeneration expense can be very big, and the chemical solvent after the regeneration deals with and be quite loaded down with trivial details.Usually can reach effective desorption with high pressure or superheated vapour regeneration to the volatile and volatile organic component that is adsorbed on the NACF inner surface, but inoperative for difficult organic matter volatilization or that be combined into salt; And analyze from desorption mechanism, high pressure is extremely disadvantageous to desorption, in order to guarantee effective desorption, must reduce the pressure of regenerating medium, adopt the low-voltage high-temperature superheated steam, this just must set up supporting indirect steam heating facility for many industrial enterprises; The superheated steam steam stripping regeneration also exists time long (the lip-deep residual moisture of NACF is evaporated fully, and temperature could rise), the big shortcomings such as (steam become condensate water) of water consumption in addition.
3, summary of the invention
At the deficiencies in the prior art, the invention provides the NACF renovation process that a kind of reclaim equiment is simple, reproduction speed is fast, effective.
The present invention is as follows about the NACF renovation process:
After NACF reaches adsorption equilibrium, at first the two end electrodes plate from container or reactor feeds 5～220V interchange or DC voltage, preferred 10～50V, control between two plates 0.5～10 ampere in electric current, preferred 1～2 ampere, make the water in active carbon fibre peacekeeping container or the reactor in 0.5～5.0 minute, obtain volatilization rapidly, in order to make homogeneous heating, rapidly and guarantee good regeneration, the volatilization back is from the continuous bubbling air of an end or the nitrogen of container or reactor before the water volatilization or fully, and the feeding amount is 100m
3/ m
2.h～1000m
3/ m
2.h.Along with the continuous volatilization of water, the rising of temperature and the reduction of NACF resistance, corresponding again adjusting both end voltage, make electric current keep 1～2 ampere stable, the control temperature be in 250 ℃～500 ℃ following 5 minutes～30 minutes.Stop current flow heats at last, keep the feeding of air or nitrogen always, be cooled to room temperature until NACF.
The inventive method is utilized the electric conductivity and the thermal conductivity of NACF, as heating and heat transfer medium, by additional power source, with the form of the inside heating material desorption with carbon fiber adsorption and catalytic combustion, makes NACF obtain regeneration NACF.The inventive method is easy to make the material desorption of absorption because the steam that heating produces is to spread to the outside internally, and reproduction speed is fast and desorption is complete.Because the heat that produces when electrical heating is very big, the process of regeneration can be finished in a short period of time.Simple, the easy to operate operation of the inventive method equipment, regeneration thorough speed fast, can be used for the regeneration of the NACF of all kinds use in waste water treatment.
4, the specific embodiment
The present invention handles the renovation process of industrial wastewater with NACF, realized by following process and equipment: NACF is seated in the container or reactor of two ends fixed plate electrode, for fear of when energising two end electrodes be short-circuited, the cylindrical shell of container or reactor is selected the insulating properties material for use or with insulating properties material lining.During to Industrial Wastewater Treatment, waste water enters bed of activated carbon fiber by an end of container or reactor, and organic matter in the waste water and stink chemical substance are attracted on the NACF.After reaching adsorption equilibrium, the battery lead plate fixing to the two ends of container or reactor feeds electric current, rely on the resistance of NACF itself to heat, the temperature of NACF raises rapidly, the moisture content of fiber surface becomes water vapour and volatilizes outside container or the reactor, and volatile organic matter and stink chemical substance stripping that while steam will be adsorbed on the NACF are gone out.Along with the volatilization of water vapour is complete, temperature is raise faster, and the end from container feeds a certain amount of nitrogen or air etc. again, and adsorbent further gas under the temperature more than 250 ℃ is carried and oxidation Decomposition.After treating that desorption is finished, stop current flow heats, the nitrogen of feeding or air etc. make the fiber in container or the reactor reduce to normal temperature fast, make NACF return to original state, and whole regenerative process can be finished in 30 minutes.
The packed density of NACF not only has influence on the occupation of land of treatment effect and device, and directly have influence on the size of NACF regeneration stage heating resistor, therefore the NACF packed density that requires among the present invention is 0.03～0.3g/cc, packed density is excessive, then too compacting of fiber, the operation resistance is big, is unfavorable for absorption and regeneration; Packed density is too small, not only can increase the scale for the treatment of apparatus, and regenerative process current flow heats inequality, and regeneration effect is bad.
For relatively large Industrial Wastewater Treatment, the inhomogeneities for fear of adsorbing in the regenerative process particularly can be divided into multistage with treating apparatus, and every section is adopted similar structure, simultaneously or segmentation handle or regenerate.
The object of the inventive method suitable treatment removes and comprises various trade effluents, outside the processing and advanced treating as the organic component that contains in industry waste water such as petrochemical industry, oil, metallurgy, food papermaking and the qualified discharge waste water thereof and stink chemical substance, also can adopt for the deep purifying of feedwater or running water.
Embodiment 1
Adopt processing method of the present invention that advanced treating is carried out in domestic certain petrochemical industry sewage-farm secondary biochemical draining, waste water COD 86mg/L contains serious foul odour.Select for use commercially available viscose glue base and each 3g of polyacrylonitrile radical active carbon fiber to be seated in diameter 25mm, in the quartz ampoule of effective depth 100mm, the two ends of quartz ampoule are fixedly goed deep into length and respectively are the battery lead plate of 15mm, and the BET specific area of two kinds of NACFs and average BJH desorption aperture are respectively 1097.8m
2/ g, 713.5m
2/ g and 2.7379nm, 2.8950nm.Waste water carries out the NACF layer by the bottom inlet of quartz ampoule, and (corresponding the liquid air speed and the time of staying are respectively wastewater flow 2L/h: 40h
-1With 1.5 minutes), each period treatment wastewater flow rate 10L.After each handles end cycle, the electrode feeding alternating current heating to the quartz ampoule two ends, adjusting both end voltage maintenance current stabilization is at 1.5 amperes, and pipe water interior and that NACF is interior volatilizees rapidly, and temperature reached 100 ℃ after 1 minute also volatilization is complete.Feed low-pressure nitrogen by the pipe end opening, nitrogen feeding amount is 0.12m
3/ h, the resistance of NACF descends rapidly and is stabilized in 40 ohm at this moment, reduces voltage and keeps current stabilization at 1.5 amperes, rises to 270 ℃ until temperature, maintenance process 15 minutes.Stop current flow heats, adsorbent bed is reduced to normal temperature after 5 minutes, and the periodic regeneration process is finished, and carry out following one-period.Keep this process to carry out 8 cycles, the water outlet in each cycle does not all have any stink, and water outlet the results are shown in Table 1.
Embodiment 2
Keep other condition of embodiment 1 constant, the wastewater treatment flow is that (corresponding the liquid air speed and the time of staying are respectively 4L/h: 80h
-1With 0.75 minute), replace nitrogen with air in the regenerative process, and when the regeneration beginning, feed.The maintenance process is carried out 8 cycles, and the water outlet in each cycle does not all have any stink, and water outlet the results are shown in Table 1.
Embodiment 3
Keep other condition of embodiment 1 constant, the prepared NACF product of method that proposes with Chinese patent 95119030.X replaces two kinds of composite fibre, and the BET specific area of NACF and average BJH desorption aperture are respectively 1811.4m
2/ g and 3.7001nm.The current flow heats maximum temperature is 350 ℃ in the regenerative process, and keeps 5 minutes.The maintenance process is carried out 8 cycles, and the water outlet in each cycle does not all have any stink, and water outlet the results are shown in Table 1.
Table 1 NACF is handled and regeneration effect
| Cycle | Embodiment 1 | Embodiment 2 | Embodiment 3 | |||
| Average water outlet CODmg/L | Clearance | Average water outlet CODmg/L | Clearance | Average water outlet CODmg/L | Clearance | |
| 1 | 33.8 | 60.5％ | 41.4 | 51.9％ | 31.4 | 63.5％ |
| 2 | 30.8 | 64.2％ | 38.8 | 54.9％ | 28.8 | 66.5％ |
| 3 | 26.6 | 69.1％ | 34.9 | 59.4％ | 24.9 | 71.0％ |
| 4 | 30.7 | 64.3％ | 42.3 | 50.8％ | 32.3 | 62.5％ |
| 5 | 34.9 | 59.4％ | 42.4 | 50.6％ | 32.4 | 62.4％ |
| 6 | 34.4 | 59.3％ | 39.6 | 53.9％ | 29.6 | 65.5％ |
| 7 | 30.6 | 64.3％ | 39.4 | 54.1％ | 29.4 | 65.7％ |
| 8 | 33.1 | 61.5％ | 35.8 | 58.4％ | 25.8 | 70.0％ |
Claims (4)
1, a kind of renovation process of handling industrial wastewater with NACF, after reaching adsorption equilibrium, NACF regenerates, it is characterized in that feeding 5～220V interchange or DC voltage at the two end electrodes plate of container or reactor, control between two plates 0.5～10 ampere in electric current, water in active carbon fibre peacekeeping container or the reactor was evaporated in 0.5～5.0 minute, kept 5～30 minutes down at 250～500 ℃ then, be cooled to room temperature behind the regeneration ending; Before water evaporation or fully evaporation is afterwards from the continuous bubbling air of an end or the nitrogen of container or reactor.
2, in accordance with the method for claim 1, the voltage that it is characterized in that described two end electrodes plate is 10～50V, and Current Control is 1～2 ampere between described two plates.
3, in accordance with the method for claim 1, the feeding amount that it is characterized in that described continuous bubbling air or nitrogen is 100m
3/ m
2.h～1000m
3/ m
2.h.
4, in accordance with the method for claim 1, it is characterized in that described NACF packed density is 0.03～0.3g/cc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02133116 CN1211156C (en) | 2002-10-10 | 2002-10-10 | Active carbon fiber regenerating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02133116 CN1211156C (en) | 2002-10-10 | 2002-10-10 | Active carbon fiber regenerating method |
Publications (2)
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| CN1488432A CN1488432A (en) | 2004-04-14 |
| CN1211156C true CN1211156C (en) | 2005-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02133116 Expired - Lifetime CN1211156C (en) | 2002-10-10 | 2002-10-10 | Active carbon fiber regenerating method |
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| CN (1) | CN1211156C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327950C (en) * | 2004-12-28 | 2007-07-25 | 天津市赛远保健品有限公司 | Adsorption activity regenerating method for active carbon functional fabric |
| CN101792195B (en) * | 2010-04-09 | 2011-06-15 | 上海交通大学 | Organic wastewater activated carbon fiber absorber and desorption device |
| CN101891331B (en) * | 2010-07-21 | 2012-06-27 | 大连交通大学 | Integrated treatment device for active carbon adsorption and electrochemical regeneration and use method thereof |
| CN105854857B (en) * | 2016-05-31 | 2019-01-22 | 上海力脉环保设备有限公司 | A kind of active carbon electric heating regenerating equipment and its application method |
| KR101909151B1 (en) * | 2016-11-28 | 2018-10-18 | 한국건설기술연구원 | Heat renewable porous absorbent coating electrode for removal of volatile material manufacturing mehtod and electrode by the same |
| CN109967059A (en) * | 2019-04-17 | 2019-07-05 | 北京航天国环技术有限公司 | Active carbon regenerating unit and exhaust treatment system |
| CN111137939A (en) * | 2020-01-19 | 2020-05-12 | 李庆辉 | Activated carbon adsorption electrified regeneration sewage treatment equipment and recovery method |
| CN112958058A (en) * | 2021-01-20 | 2021-06-15 | 江苏科威环保技术有限公司 | Activated carbon electrothermal desorption system |
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- 2002-10-10 CN CN 02133116 patent/CN1211156C/en not_active Expired - Lifetime
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