CN1374260A - MIcrowave catalytic oxidation process and apparatus for treating waste water containing hard-to-degrade organic matters - Google Patents
MIcrowave catalytic oxidation process and apparatus for treating waste water containing hard-to-degrade organic matters Download PDFInfo
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Abstract
The present invention is microwave catalytic oxidation process and apparatus for treating waste water containing hard-to-degrade organic matters. The treating process includes grille depuration, flocculating deposition, catalytic oxidation and steam condensation; and features the catalytic oxidation, which is performed in a microwave reactor with oxidant-to-waste water COD ratio of 1.0-20 %, temperature below 100 deg.c and dwell time of 4-17 min. The apparatus includes raw water trough, flow meter, air-liquid mixer, heat exchanger, pump and blower. The microwave reactor consists of one inner reactor and one microwave resonator. The present invention has the advantages of low temperature and normal pressure, high degradation efficiency, etc.
Description
Technical field the present invention relates to novel water technology and the device that microwave electromagnetic energy technology combines with the catalyzed oxidation technology, is used to handle organic wastewater with difficult degradation thereby, belongs to water treatment field.
The so-called organic wastewater with difficult degradation thereby of background technology is meant that difficult degradation, biodegradability are poor, its
Be worth very for a short time, usually less than 0.2, and the high organic waste water of COD value height or colourity also claims high concentration hard-degraded organic waste water.The water yield is not very big, but pollution load is very big, adopts traditional biochemical process to be difficult to reach the treatment effect of expection.Its main source is industry production waste water such as papermaking, dyestuff, pharmacy, organic synthesis, refining of petroleum, pesticide producing.In a single day this class waste water enter into environmental system can cause extremely serious consequence, often causes the irreversible lesion of environmental system.
The method that is used to handle falling property of difficulty organic waste water at present has burning method, extraction process and catalytic wet oxidation method.
Burning method is to handle the simplest, the effective means of high concentration hard-degraded organic waste water.This method is to add some oil fuel organic pollutant is burnt in incinerator, can make organic pollutant obtain mineralising more completely.Yet the problem that this method exists has CO when being burning
2, NO
x, SO
x, HCl even have more toxic dioxin-like chemical and discharge and cause topsoil; Simultaneously, need a large amount of oil fuel during burning, generally handle the oil fuel that one ton of waste water need be suitable with it, the processing cost costliness.Therefore, this method is eliminated gradually.
Extraction process is to utilize the similar principle that mixes, with organic solvent with organic substance extraction in the water to organic solvent, reach purpose with water sepn.This technology relates to extraction, be extracted separating of organism and solvent, water.Have when recycle being worth when being extracted organism, this method embodies advantage.But, be extracted organism and form complexity, generally there is not recovery value, must further handle.When further handling, formality is numerous and diverse to tend to cause secondary pollution.
The catalytic wet oxidation method is at high temperature (175～350 ℃), high pressure (under 2000～20000kPa), with O
2As oxygenant, in the presence of catalyzer, oxidation removes the middle organism that anhydrates, and finally reaches the purpose of mineralising.The seventies in 20th century, abroad, this technical development is very fast, Japan has set up the catalytic wet device in succession and has handled various organic waste waters, handles ethylene production spent scrub stream, its operational condition: 200 ℃ as Nippon Mitsubishi Oil chemical company, 3445kPa stops 60min, and treatment capacity is 120m
3/ d, water inlet COD is 7.5-15g/L, and water outlet COD is 2.475-3.0g/L, and the COD clearance is 67%-80%; Kawasaki, Japan morning sun chemical company handles acrylonitrile process waste water, its operational condition: 250 ℃, 6890kPa stops 90min, and treatment capacity is 790m
3/ d, water inlet COD is 37-46g/L, and water outlet COD is 14.8-16.1g/L, and the COD clearance is 60%-65%.More research report was arranged from the eighties to the nineties, and this technology is still in in-depth research at present.The Yin Chenglong of the Du Hongzhang of Dalian Inst of Chemicophysics, Chinese Academy of Sciences etc. and Anshan Research and Design Inst., of Coking and Refractorics, Ministry of Metall etc. have delivered the result of study of handling high-concentration organic sewage difficult to degrade about catalytic wet air oxidation in 1997.Its details is seen " water technology ", and the honest and clean Qingjian River, Du Hong chapter room justice Wu Rong An Liwen encourages Yin Chenglong meter backbone, 1997,6, " research of high-concentration organic sewage difficult to degrade wet oxidation purification techniques II reaction process condition " article of delivering.The principal reaction device is that TA3 type titanium steel by antiacid caustic corrosion is processed in the research, and its design pressure is 12.0MPa, use temperature≤350 ℃, reactor inside diameter 16mm, long 500mm.The equipment that uses in the technological process has air container, tensimeter, preceding pressure controller, gas regulating valve, mass flowmeter, water gauge line, high pressure sewage fresh feed pump, preheater, reactor, process furnace, water cooler, gas-liquid separator, water tank, back pressure controller, exhaust flow meter.Step when handling waste water: oxidant gas (air) is from steel cylinder, transfer to required pressure through preceding pressure controller, again after the former water mixing preheating through failing with the micro-fresh feed pump of height behind the mass flowmeter, enter reactor by reactor bottom, the porcelain grain is loaded in the upper and lower part in the reactor, middle dress catalyzer, the high about 7.5cm of bed, reacted material is come out by the reactor upper end, cool off, separate with separator through condenser successively, sampling analysis when liquid enters water tank, gas through after pressure-regulator and the emptying of exhaust flow meter.The optimum process condition of reaction is 270 ℃, 9.0MPa, and air capacity is 6.2L/h, the charging air speed is 2.0h
-1The weak point of this Technology: (1) reaction must be carried out under the 9.0MPa condition obtaining satisfied result at 270 ℃; (2) cost an arm and a leg from controlling catalyst; (3) there is certain difficulty in this technology popularization.
Summary of the invention purpose of the present invention and task will solve prior art and exist: (1) catalyzer costs an arm and a leg, and in use easily poisons and loss, causes cost of water treatment higher, and enterprise is difficult to bear; (2) must under high temperature, high pressure, react, so the condition harshness, environmental risk easily caused; (3) promote the big deficiency of difficulty, and the temperature and the atmospheric pressure state that provide a kind of whole reaction system to be in to be lower than 100 ℃, cost is low, organic matter degradation efficient height, technology is simple, easy to operate, technology that easily is automated and device, the special technology of microwave catalysis oxidation treated high concentration organic wastewater with difficult degradation thereby and the technical solution of device of proposing.
Basic design of the present invention is a kind of novel water technology that utilizes microwave electromagnetic can technology to combine with the catalyzed oxidation technology, utilizes the heat effect of microwave electromagnetic energy and non-thermal effect to make organic pollutant carry out oxidizing reaction in the presence of catalyzer and oxygenant and degrades.
This invention is intended to utilize the heat effect of microwave electromagnetic energy and non-thermal effect to substitute high temperature, high pressure, in the presence of catalyzer and oxygenant, causes the hardly degraded organic substance oxygenolysis.Its technological process: waste water is after grid is removed foreign material, flocculating settling is removed suspended substance, clear liquid enters reactor by under meter with 60L/h-140L/h, hardly degraded organic substance in the waste water is degraded under the synergy of microwave, catalyzer and oxygenant, handles back water by discharging of reactor lower end or reuse.The amount of oxygenant should be 1.0～20% addings in the ratio with COD value of waste water.The steam that produces in the reaction process discharges or reuse after flowing out into the interchanger condensation by reaction buffer top.
The technology and the device of microwave catalysis oxide treatment organic wastewater with difficult degradation thereby proposed by the invention, the technology of its microwave catalysis oxidation organic wastewater with difficult degradation thereby, mainly comprise waste water [1], grid impurity elimination [2], flocculating settling [3], disgorging [4], clear liquid under meter [5] metering, catalyzed oxidation, water outlet discharging or reuse, heating and the residence time, it is characterized in that: the catalyzed oxidation of waste water [1] is to carry out in waste water is flowed through microwave reactor [17] process, its water (flow) direction be adopt to go out under enterprising or under go out mode on advancing and carry out; In water flowing in microwave reactor [17], Ying Xiangqi feeds oxidant gas or liquid, and its amount should be 1.0～20% enforcements in the ratio of COD value in oxygenant quality and the waste water [1]; Temperature in the microwave reactor [17] should be a normal pressure less than 100 ℃, pressure; The catalyzer and the support of the catalyst of filling should be absorbing materials in the microwave reactor [17], and the floor height of catalyzer or support of the catalyst is 3/5～4/5 of an internal reaction device height; The residence time (promptly flow through reactor time) of waste water [1] in microwave reactor [17] is 4～17min.
The technology of microwave catalysis oxide treatment organic wastewater with difficult degradation thereby of the present invention, it is further characterized in that: gas that is adopted or liquid oxidizer should be the materials that the air, pure oxygen, hydrogen peroxide and some superoxide that do not react with pipeline, microwave reactor [17], catalyzer maybe can produce free radical; Catalyzer that is adopted or support of the catalyst should be the carbonaceous materials that can absorb microwave, as coke, powdered carbon, gac, carbon black, graphite etc. or ferromagnetic metal, as iron, cobalt, nickel, manganese, cadmium, vanadium and copper, zinc etc. and oxide compound or composite oxides.
The technology and the device of microwave catalysis oxide treatment organic wastewater with difficult degradation thereby proposed by the invention, the device of its microwave catalysis oxide treatment organic wastewater with difficult degradation thereby, mainly comprise former tank [14], under meter [5], gas liquid mixer [19], oxygenant e Foerderanlage [8], interchanger [10], pump [16] and blower fan [13] constitute, it is characterized in that: it also comprises the microwave reactor [17] that is made of internal reaction device [6] and microwave resonator [7], the stainless steel sieve plate flange [28] that is covered with sieve aperture [20] by the centre respectively at the two ends up and down of internal reaction device [6] covers, and by bolt and internal reaction device [6], microwave resonator [7] is connected, the top of internal reaction device [6] links to each other with reaction buffer [26], be provided with waste water import [22] in the reaction buffer upper end, vapour outlet [23], standby mouthful [24], be provided with backwash water outlet [25] in the side of reaction buffer [26], the lower end of internal reaction device [6] is located on the reactor stand [35] by stainless steel sieve plate flange [28], and be connected with stainless steel cone [32], be provided with treating water outlet [34] in stainless steel cone [32] lower end, the side has oxidant inlet [33], microwave resonator [7] is provided in a side of the outside of internal reaction device [6], and at the outer side wall of microwave resonator [7], be provided with a plurality of magnetrons (microwave generator) [29], the inner chamber of internal reaction device [6] is provided with supporting layer [27] and is filled with catalyzer [30] betwixt.
The device of microwave catalysis oxide treatment organic wastewater with difficult degradation thereby proposed by the invention, it is further characterized in that: stainless steel sieve plate flange [28] sieve aperture [20] that the centre was covered with, its aperture is 0.3～3.0mm, the total area in its aperture should account for 10%～25% of sieve plate area in the stainless steel sieve plate flange [28], and microwave resonator [7] is that the light metal alloy material with magnesium, zinc, aluminium, nickel is made into the tubular article that the transverse section is Polygons or garden shape; Microwave resonator [7] outer side wall is provided with equally distributed 16～32 magnetrons [29], and the power of each magnetron is 0.5～2.0kw; Internal reaction device [6] is to be made by electromagnetic wave transparent material, and its material is polystyrene, tetrafluoroethylene, quartz, various glass and various potteries etc.
Organic waste water stops 4～17mm in the reactor domestic demand among the present invention, its objective is in order to allow the hardly degraded organic substance in the waste water fully be carried out oxygenolysis.
When waste water COD≤2500mg/L, the residence time is 4～10min, promptly gets its lower limit time; When waste water COD 〉=2500mg/L, the residence time is 11～17min, promptly gets its upper limit time; Most optimal retention time is 12～13min.
In the technological process, the influent waste water mode goes out under can be enterprising, go out on also can advancing down, but under to go out on advancing mainly be to use during for anti-Xian's catalyzer or loosening bed.
Catalyzer that is adopted in the technology or support of the catalyst should be the carbonaceous materials that can absorb microwave, as coke, powdered carbon, gac, carbon black, graphite etc. or ferromagnetic metal, as iron, cobalt, nickel, manganese, cadmium, vanadium and copper, zinc etc. and oxide compound or composite oxides, place it on the supporting layer above the sieve plate flange of internal reaction device lower end, the catalyzer floor height is 3/5～4/5 of an internal reaction device height, and places supporting layer catalyst loss when preventing anti-Xian on catalyzer.Oxygenant is gas or the liquid that the air, pure oxygen, hydrogen peroxide and some superoxide that do not react with pipeline, microwave reactor [17], catalyzer maybe can produce free radical; Its add-on should be that 1.0～20% quantity adds by the ratio of oxygenant total mass number and COD value.When waste water COD≤2500mg/L, the oxygenant total mass number is 1.0～10% with the ratio of COD value, promptly gets its lower limit ratio; When waste water COD 〉=2500mg/L, the oxygenant total mass number is 11～20% with the ratio of COD value, promptly gets its upper limit ratio; Optimum ratio 12～15%.
The internal reaction device up and down on the stainless steel sieve plate flange at two ends the aperture of sieve aperture be 0.3～3.0mm, the total area of its sieve aperture [20] accounts for 10～25% of sieve plate area in the whole sieve plate flange, and the sieve plate area in the said here stainless steel sieve plate flange is meant that the area of a circle at the place, centre of flange equals the area of a circle of its inner chamber area size of internal reaction device [6] transverse section.
Microwave resonator [7] outer side wall is provided with equally distributed 16～32 magnetrons [29], and the power of each magnetron is 0.5～2.0kw.When the number of magnetron fixedly the time, the power of magnetron increases, and the microwave power of supplying with the internal reaction device increases; When the power of magnetron fixedly the time, increase the number of magnetron, the microwave power of supplying with the internal reaction device increases, can be according to practical situation, in the relation of adjusting under the situation that guarantees power demand between magnetron number and single wattage in the enforcement.
When the processing efficiency of catalyzer descends 15～30% the time, whole catalyzer needs anti-Xian Zaisheng.
Precaution when adopting process unit of the present invention to carry out wastewater treatment: answer the integrity of inspection apparatus, equipment and pipeline and each junction thereof that ne-leakage is arranged before (1) device starts; (2) check being connected and security of power supply system and power unit; (3) leakage situation of inspection microwave source; (4) after guaranteeing that above-mentioned three check results are qualified, can start Waste Water Treatment.During startup, after must advanced waste water waiting to be full of reactor, connect microwave power supply again, magnetron is started working and is discharged the microwave electromagnetic energy.Starting blower fan simultaneously makes cooling system work to guarantee that magnetron does not heat up; (5) before the end of run, must close microwave power supply earlier, stop into waste water simultaneously, and blower fan works on to magnetron and cools off fully.
Major advantage of the present invention is: (1) because whole reaction system is to be in low temperature and the atmospheric pressure state that is lower than 100 ℃, and the reactor floor space is little, thus processing cost low be 40～60% of prior art; (2) because the heat effect and the non-thermal effect of microwave, thus organic matter degradation efficient height, than the raising 20～40% of prior art; (3) because reaction is to move under low temperature, atmospheric pressure state, easy to operate so technology is simple, realize automatic production easily; (4) not only handle the organic wastewater degraded rate height of difficult degradation, and high concentration hard-degraded organic waste water is also had than obvious effects.
Be to the description of the drawings of the present invention below:
The present invention establishes 6 accompanying drawings altogether, and Fig. 1 is a process flow diagram synoptic diagram of the present invention; Fig. 2 is the integral planar arrangement relation structural representation of microwave catalysis oxidation unit of the present invention; Fig. 3 is that microwave reactor of the present invention is faced cross-sectional view; Fig. 4 is the I portion amplification profile structural representation of Fig. 3; Fig. 5 is the stainless steel sieve plate flange plan structure synoptic diagram in the microwave reactor; Fig. 6 is that the stainless steel sieve plate flange in the microwave reactor is faced the semi-section structural representation.
Now each accompanying drawing is respectively described below:
Fig. 1 is a process flow diagram synoptic diagram of the present invention.
Waste water [1] is after grid impurity elimination [2], carry out flocculating settling [3] and throw out [4] is removed, its clear liquid is by under meter [5] metering, provide energy by magnetron by the inside reactor [6] of microwave resonator [7], provide oxygenant by the inside reactor [6] of oxygenant e Foerderanlage [8], at catalyzer, oxygenant and microwave electromagnetic can act synergistically down, internal reaction device [6] in microwave reactor carries out catalyzed oxidation, and waste water [1] stops the degraded of having finished organic pollutant in the specific time in microwave reactor, wherein the steam of Chan Shenging [9] is through interchanger [10] condensation, thereby formed steam condensate [11], stand-by, then discharge or reuse for handling back water outlet [12].
Solid arrow is represented water, steam through pipeline and the mobile direction among the figure, and the dotted arrow among the figure represents that then inside reactor [6] provides microwave electromagnetic energy, oxygenant and the direction of cooling air is provided to microwave resonator [7].Symbol [13] is the blower fan of using in order to the cooling magnetron.
Fig. 2 is the integral planar arrangement relation structural representation of microwave catalysis oxidizing treater proposed by the invention.
Show among the figure that waste water is collected in the former tank [14] through the grid impurity elimination, through becoming clear liquid behind flocculating settling and the disgorging.Then, under the effect of pipeline [15] and pump [16], by under meter [5] metering, just by waste water import [22] enter be located on the reactor stand [35] by microwave resonator and the microwave reactor [17] that the internal reaction device of catalyzer is constituted is housed.At this moment, operation and controlled oxidation agent e Foerderanlage [8] by master control cabinet [18], to the internal reaction device delivery of oxidizing agent of microwave reactor [17], provide the microwave electromagnetic energy to the internal reaction device of microwave reactor [17] by the magnetron that is located on the microwave resonator outer side wall.Therefore, under the synergy of catalyzer, oxygenant and microwave electromagnetic energy, carry out catalyzed oxidation, oxygenolysis just takes place in the organic pollutant of the difficult degradation in the waste water, thereby in the flow time (or claiming the residence time) of microwave reactor [17] lining regulation, reach the purpose of purification.
The steam that produces in the process by vapour outlet [23], becomes water of condensation [11] and stores stand-byly after interchanger [10] condensation, handle back water outlet [12] by treating water outlet outflow or discharging or reuse.Being located at microwave reactor [17] blower fan [13] nearby is to use for the magnetron cooling.In the microwave catalysis oxidizing treater, also be provided with and supply to advance under the waste water when outing the gas liquid mixer of the usefulness that waste water mixes with gaseous oxidant.Solid arrow represents water, steam, through pipeline [15] and the mobile direction, dotted arrow represents to provide to microwave reactor the direction of electromagnetic energy, oxygenant and cooling air.
Fig. 3 is that the designed microwave reactor of the present invention is faced cross-sectional view
Show among the figure that microwave reactor mainly is made up of internal reaction device [6] and microwave resonator [7] two portions.The two ends up and down of internal reaction device [6] use stainless steel sieve plate flange [28] to cover respectively, and tighten together with it by bolt, then, be fastened and connected with microwave resonator [7] again, stainless steel sieve plate flange [28] centre evenly is covered with the sieve aperture that the aperture is 0.3～3.0mm [20], and the top of internal reaction device [6] is connected with reaction buffer [26].Upper end and side in reaction buffer are respectively arranged with waste water import [22], vapour outlet [23], standby mouthful of [24] and backwash water outlet [25], and the lower end of internal reaction device [6] is connected with stainless steel cone [32], and the cone lower end is provided with treating water outlet [34].When going out on advancing under wastewater treatment is adopted, then the treating water of cone lower end outlet [34] promptly changes the waste water import into, and the lateral backwash water outlet of reaction buffer [26] [25] then becomes the treating water outlet.When backwash, the treating water of its cone lower end outlet [34] also becomes the backwash water import, still is the backwash water outlet and be in the lateral backwash water outlet of reaction buffer [26] [25].The lower end of internal reaction device [6] is located on the reaction stand [35] by stainless steel sieve plate flange [28], and is connected with stainless steel cone [32].Also be provided with liquid or gaseous oxidant import [33] in the cone side.
Microwave resonator [7] is provided in a side of the outside of internal reaction device [6], and the inner chamber of internal reaction device [6] is provided with supporting layer [27] and is filled with catalyzer [30] betwixt.
Be evenly distributed with the magnetron [29] of a plurality of generation microwaves on microwave resonator [7] outer side wall, the cooling system that the cooling of magnetron is made up of hose connection blower fan of number of metal [13] and air channel carries out.
The integral body of microwave reactor is garden cylindricality or polygonal turricula.
Symbol [31] is a supply lead, and symbol [36] is a power supply.
The heavy line arrow is represented the enterprising water (flow) direction that goes out down of wastewater treatment employing, and the fine line arrow is represented the vapour stream outgoing direction.
The water (flow) direction that dotted arrow goes out on representing to advance under the wastewater treatment employing.
Fig. 4 is the I portion amplification profile structural representation of Fig. 3.
Show among the figure, stainless steel sieve plate flange [28] and microwave resonator [7] and internal reaction device [6], the relation that is fastenedly connected by bolt, sieve aperture [20] is the central position that is in stainless steel sieve plate flange [28], and during assembling, steel flange is in the position of internal reaction device [6] upper and lower ends, its symbol [21] is a bolt hole, [27] be supporting layer, [30] are catalyzer, and [26] are reaction buffer.
Fig. 5 is stainless steel sieve plate flange [a 28] plan structure synoptic diagram designed in the microwave reactor.
Show among the figure, stainless steel sieve plate flange [28], its centre is provided with a plurality of sieve apertures [20], and the outer shroud place in the centre also is provided with a plurality of bolts hole [21] structure that available bolt and internal reaction device are connected with the microwave resonator end respectively.
Fig. 6 be Fig. 5 face the semi-section structural representation.
The same Fig. 5 of symbol among the figure.
The present invention has 3 subordinate lists:
Table 1 is that microwave catalysis oxygen is handled the pesticide wastewater detected result, the result shows technology of the present invention and the equipment of adopting, under optimum process condition, can make the COD of pesticide wastewater reduce more than 85%, and shortened the treatment time, thereby reduced cost for wastewater treatment, also demonstrate in the table except that optimum parameter, the matching result of other each parameter is all within desired extent.
Table 2 is microwave catalysis oxide treatment acid green dyestuff simulated wastewater detected results, the result shows that technology of the present invention and equipment have better effect to the colourity that reduces this class waste water from dyestuff, under optimum process condition, decolorization rate of wastewater is greater than 99%, also demonstrate in the table except that optimum parameter, the matching result of other each parameter all is in the contemplation.
Table 3 is microwave catalysis oxide treatment laboratory organic waste water detected results, and table adopts technology of the present invention and equipment as a result, and under optimum process condition, laboratory organic waste water COD clearance is about 90%.Also demonstrate in the table except that optimum parameter, the coupling of other each parameter has all been received effect preferably.
Embodiment
Embodiment 1
Dalian * * insecticide factory's production wastewater treatment
This be an annual output * * ten thousand tons * * * insecticide factory, agricultural chemicals synthetic wastewater amount is 10 ton per days, waste water COD is 4000～10000mg/L, adopts technology of the present invention and device to investigate the clearance of waste water COD.
From Dalian * * * waste water that insecticide factory fetches, no-sundries in the water, and it is more transparent, therefore waste water [1] does not need grid impurity elimination [2] and flocculating settling [3] to handle after being collected in former tank [14], directly by pump [16] after under meter [5] metering, pump in the microwave reactor [17] and carry out catalytic oxidation, handle for the treatment of water outlet [34] discharging of back water through the microwave reactor lower end.The steam that produces in the reaction process [9], the vapour outlet [23] through reaction buffer [26] upper end enters interchanger [10], cooling back reuse.Its concrete implementation step is as follows:
The first step, sampling analysis, the result is: no-sundries is more transparent in the waste water.
In second step, optimal processing parameter selected: flow 60L/h, residence time 15min, 85 ℃ of temperature, catalyst n i-Cu-C, oxygenant adopt H
2O
2The ratio of itself and COD value is 15%, power 13.5kw, sieve diameter 2.5mm and 200 of numbers, 9 of magnetron numbers, wattage 1.5kw, microwave reactor cross-sectional area are pentagon, its inscribe garden diameter is 157mm, the microwave reactor height is 1000mm, its material is an aluminium alloy, the catalyst loading method is the filling of heap formula, and it highly is 4/5 of an internal reaction device height.
The 3rd step, equipment inspection: power supply system, microwave system leakage situation, equipment and instrument integrity, security, seepage situation.
The 4th step, starting: on inspection each side qualified after, the beginning start-up routine at first starts Waste Water Treatment, treat that waste water is full of microwave reactor after, open blower fan, and then connect microwave power supply, said procedure is all operated by master control cabinet [18] and is finished.
In the 5th step, shut down: its program is to close microwave power supply earlier, stops into waste water simultaneously, treat the magnetron cooling after, the blowing-out machine.
In the 6th step, effluent characteristics detects: adopt potassium dichromate process to measure water outlet COD value, and calculate the COD clearance.Under optimum process condition, water outlet COD clearance is 89.2%.
The specific series data are listed table 1 in.
Dye wastewater is handled
Adopting commercially available acid green dye ligand to become colourity is 6000～7000 times dye wastewater, adopts apparatus of the present invention to investigate its percent of decolourization.The acid green dye wastewater of experiment autogamy does not have assorted transparent, directly behind under meter [5], pumps into microwave reactor [17] and carries out oxygenolysis and send out reaction, handles treating water outlet [34] reuse through the microwave reactor lower end of back water.The steam that produces in the reaction process [9], the vapour outlet [23] through the microwave reactor upper end enters interchanger [10], cooling back reuse.Concrete steps are with embodiment 1 (being omitted), its optimal processing parameter is as follows: flow 100L/h, residence time 12min, 85 ℃ of temperature, catalyst n i-C, oxygenant adopt air, the ratio of itself and COD value is 10%, power 9kw, sieve diameter 3.0mm and 150 of numbers, 18 of magnetron numbers, wattage 0.5kw, microwave reactor size φ 137 * 1200, to be characterized as garden tubular, magnalium, catalyst loading method be the filling of heap formula, and it highly is 3/5 of an internal reaction device height.
Effluent characteristics detected result: percent of decolourization＞99%.The specific series data are listed table 2 in.Embodiment 3
The laboratory treatment of Organic Wastewater
To be collected in the former tank after the organic waste water impurity elimination of laboratory, add the simulated wastewater that useless organic reagent such as water and phenol, acetate etc. is made into COD～9000mg/L again, adopt technology of the present invention and device to investigate COD removal.The translucent nothing of simulative organic wastewater of experiment autogamy is assorted, directly behind under meter [5], pumps into microwave reactor [17] and carries out oxidative decomposition, handles treating water outlet [34] discharging of back water through the microwave reactor lower end.The steam that produces in the reaction process [9], the vapour outlet [23] through the microwave reactor upper end enters interchanger [10], cooling back reuse.Concrete steps are with embodiment 1 (being omitted), and its optimal processing parameter is as follows: flow 60L/h, residence time 14min, 80 ℃ of temperature, catalyst Fe-La-C, oxygenant adopt O
2Be 14% with the ratio of COD value, power 13.5kw, sieve diameter 3.0mm and 250 of numbers, 15 of magnetron numbers, wattage 0.9kw, microwave reactor cross-sectional area be pentagon, its inscribe garden diameter is 137mm, the microwave reactor height is 1200mm, its material is an aluminium alloy, the catalyst loading method is the filling of heap formula, and it highly is 4/5 of an internal reaction device height.
The effluent characteristics detected result: the COD clearance is 91.3%.The specific series data are listed table 3 in.
Table 1 microwave catalysis oxide treatment pesticide wastewater detected result
Table 2 microwave catalysis oxide treatment acid green dyestuff simulated wastewater detected result
Table 3 microwave catalysis oxide treatment laboratory organic waste water detected result
Claims (7)
1, the technology of microwave catalysis oxide treatment organic wastewater with difficult degradation thereby, mainly comprise waste water [1], grid impurity elimination [2], flocculating settling [3], disgorging [4], clear liquid under meter [5] metering, catalyzed oxidation, water outlet discharging or reuse, heating and the residence time, it is characterized in that:
A) catalytic oxidation treatment of waste water [1] is to carry out in the microwave reactor of flowing through [17] process, and its water (flow) direction is that the mode that goes out on adopting to go out or advance down for enterprising time is carried out;
B) in water flowing in microwave reactor [17], feed oxidant gas or liquid in the Ying Xiangqi, its amount should be 1.0～20% enforcements in the ratio of oxygenant quality and COD value of waste water;
C) temperature in the microwave reactor [17] should be less than 100 ℃, and pressure is normal pressure;
D) catalyzer or the support of the catalyst of filling should be absorbing materials in the microwave reactor [17], and the floor height of catalyzer or support of the catalyst is 3/5～4/5 of an internal reaction device height;
E) residence time of waste water [1] in microwave reactor [17] is 4～17min.
2, the technology of microwave catalysis oxide treatment organic wastewater with difficult degradation thereby according to claim 1, it is characterized in that: gas that is adopted or liquid oxidizer should be air, pure oxygen, hydrogen peroxide and some superoxide that does not react with pipeline, microwave reactor [17], catalyzer or the material that can produce free radical.
3, the technology of microwave catalysis oxide treatment organic wastewater with difficult degradation thereby according to claim 1, it is characterized in that: catalyzer or support of the catalyst should be the carbonaceous materials that can absorb microwave, as coke, powdered carbon, gac, carbon black, graphite or ferromagnetic metal, as iron, cobalt, nickel, manganese, cadmium, vanadium and copper, zinc etc. and oxide compound or composite oxides.
4, the device of microwave catalysis oxide treatment organic wastewater with difficult degradation thereby, mainly comprise: former tank [14], under meter [5], gas liquid mixer [19], oxygenant e Foerderanlage [8], interchanger [10], pump [16] and blower fan [13], it is characterized in that: it also comprises the microwave reactor [17] that is made of internal reaction device [6] and microwave resonator [7], the stainless steel sieve plate flange [28] that is covered with sieve aperture [20] by the centre respectively at the two ends up and down of internal reaction device [6] covers, and link to each other with microwave resonator [7] with internal reaction device [6] by bolt, the top of internal reaction device [6] is connected with reaction buffer [26], be provided with waste water import [22] in the reaction buffer upper end, vapour outlet [23], standby mouthful [24], side in reaction buffer [26], be provided with backwash water outlet [25], the lower end of internal reaction device [6], be located on the reactor stand [35] by stainless steel sieve plate flange [28], and be connected with stainless steel cone [32], in stainless steel cone [32] lower end, be provided with treating water outlet [34], the side has oxidant inlet [33], microwave resonator [7] is located at the outside of internal reaction device [6], the outer side wall of microwave resonator [7], be provided with a plurality of magnetrons [29], the inner chamber of internal reaction device [6] is provided with supporting layer [27] and is filled with catalyzer [30] betwixt.
5, microwave oxidation catalysis according to claim 4 is handled the device of organic wastewater with difficult degradation thereby, it is characterized in that: sieve aperture [20] diameter on the stainless steel sieve plate flange [28] is 0.3～3.0mm, and the total area in its aperture should account for 10～25% of sieve plate area in the stainless steel sieve plate flange.
6, the device of microwave catalysis oxide treatment organic wastewater with difficult degradation thereby according to claim 4, it is characterized in that: microwave resonator [7] is the tubular article that the light metal alloy material with magnesium, zinc, aluminium, nickel is made into, its transverse section is Polygons or garden shape, its outer side wall is provided with equally distributed 16～32 magnetrons [29], and the power of each magnetron is 0.5～2.0kw.
7, the device of microwave catalysis oxide treatment organic wastewater with difficult degradation thereby according to claim 4 is characterized in that: internal reaction device [6] is to be made by electromagnetic wave transparent material, and its material is polystyrene, tetrafluoroethylene, quartz, glass and pottery.
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