CN104478065A - Catalytic ozonation reactor for expanded bed and sewage treatment method of catalytic ozonation reactor - Google Patents
Catalytic ozonation reactor for expanded bed and sewage treatment method of catalytic ozonation reactor Download PDFInfo
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- CN104478065A CN104478065A CN201410775079.5A CN201410775079A CN104478065A CN 104478065 A CN104478065 A CN 104478065A CN 201410775079 A CN201410775079 A CN 201410775079A CN 104478065 A CN104478065 A CN 104478065A
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- sewage
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- tail gas
- water
- ozone
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
Abstract
The invention discloses a catalytic ozonation reactor for an expanded bed. An ozone distributor, a feedwater distributor and a catalyst bed are sequentially arranged inside the reactor from bottom to top, a tail gas pipe and a sewage outlet pipe are arranged at the upper part of the reactor, a tail gas return pipe is arranged at the tail gas pipe, a sewage return pipe is arranged on the sewage outlet pipe, the tail gas return pipe and the sewage return pipe are respectively communicated with a gas phase inlet and a water phase inlet of a water injector; a return water/gas distributor is arranged between the catalyst bed and the feedwater distributor, and an outlet of the water injector is communicated with the return water/gas distributor by virtue of a pipeline; in an operational process of the reactor, the catalyst bed is in an expanded state under the hydraulic action of feedwater and return sewage. The invention also discloses a sewage treatment method applying the catalytic ozonation reactor for the expanded bed. The sewage treatment method disclosed by the invention has the advantages that sewage treatment depth can be improved, ozone utilization rate can be greatly increased, and tail gas can meet discharge standard requirements, so that the sewage treatment method is environmentally friendly, and resource can be saved.
Description
Technical field
The invention belongs to technical field of sewage, relate to sewage disposal catalytic ozonation equipment, be specially a kind of expanded bed catalytic ozonation reactor and sewage water treatment method thereof.
Background technology
Ozone, as a kind of strong oxidizer, is widely used in wastewater treatment.For improving ozone utilization rate and sewage treating efficiency, the mode of catalytic ozonation is generally adopted to carry out sewage disposal at present.Catalytic ozonation has been successfully applied to the aspects such as advanced treatment of wastewater, reusing sewage, the difficult biochemical sewage pre-treatment of high density, and ozone utilization rate and the more independent ozone oxidation of sewage treating efficiency improve a lot.But the research of catalytic ozonation mainly concentrates on catalyzer research and development aspect at present, have developed the catalyzer of different carriers and load different activities component, the catalyst application scope developed is different, and treatment effect is each variant.Research Emphasis is placed on exploitation effective catalyst to improve in ozone utilization rate and sewage treating efficiency by current each research institution, and rarelyr improves ozone utilization rate and sewage treating efficiency by studying, designing and developing high efficiency reactor.The reactor of current investigation and application is mainly two kinds of fixed bed catalytic oxidation reactors: one is sewage, ozone coflow, by reactor bottom from bottom to top by reactor catalyst bed, catalytic oxidation occurs; Another kind is sewage, ozone countercurrent flow, sewage from top to bottom, ozone from bottom to top by reactor catalyst bed, there is catalytic oxidation.
The subject matter that existing fixed bed catalytic ozonation reactor exists has:
(1) fixed bed catalytic reactor is after operation for some time, as 6 ~ 7 days, beds space and catalyst surface can by bring in sewage or suspended substance, colloid blocking that reaction produces or pollute, need regularly carry out back flushing to beds; Add reactor operation easier, improve automatic control requirement, and produce the process further of a certain amount of backwashing wastewater need;
(2), the unreasonable or processing in water distributor, gas pipe design, setting accuracy are not high, and when operational management is not good at, channeling can be there is, have a strong impact on treatment effect in fixed bed catalytic reactor;
(3) ozone passes in sewage by the main mode of perforated pipe or micro-pore aeration that adopts, and the bubble formed in sewage due to ozone is comparatively large, and dissolution rate is lower, thus causes ozone utilization rate low, and the ozone content in outer last person's gas is more; Do not dissolve in tail gas after reaction and do not reclaim with unreacted ozone, cause the waste of ozone;
(4) the solvability ozone not having enough time in sewage to react directly is discharged, if follow-up sewage disposal is connected to biological processing unit, also need to carry out the process such as ozone stripping to sewage, add treatment process on the one hand, cause the waste of ozone on the other hand;
(5) sewage residence time in reactor is generally 0.5-1.0 hour, and in the middle part of sewage, difficult oxidizing substance is not able to do in time oxidized with regard to discharge, and reaction depth is inadequate, causes sewage treating efficiency not high.
Summary of the invention
In view of this, the object of the invention is to for above-mentioned the deficiencies in the prior art, a kind of expanded bed catalytic ozonation reactor is provided, can be used for advanced treatment of wastewater, reusing sewage, the fields such as the difficult biochemical sewage pre-treatment of high density, more traditional fixed bed catalytic oxidation reactor, improves ozone utilization rate greatly.
Technical scheme of the present invention is as follows:
A kind of expanded bed catalytic ozonation reactor, inside reactor is upwards disposed with ozone sparger, inlet distribution device and beds from bottom, reactor top is provided with offgas duct and sewage rising pipe, it is characterized in that: offgas duct is provided with tail gas return line, sewage rising pipe is provided with sewage backflow pipe, and tail gas return line and sewage backflow pipe are communicated to gas phase import and the aqueous phase import of water sprayer respectively; Be provided with between beds and inlet distribution device recirculation water gas sparger, water sprayer outlet by pipeline connection to recirculation water gas sparger.
Further, reactor head is provided with exhaust collection cover, and exhaust collection cover top is communicated with described offgas duct, is provided with tail gas control valve between offgas duct relief outlet and tail gas return line; Be provided with sewage control valve between sewage rising pipe relief outlet and sewage backflow pipe, sewage backflow pipe is provided with recirculation water topping-up pump; Ozone sparger is communicated with ozone inlet pipe, and inlet distribution device is communicated with water inlet pipe, and water inlet pipe is provided with into water topping-up pump; Be disposed with catalyzer bed course and catalyst support grid below beds, catalyst support grid is positioned at above Hui Liushui gas sparger.
Further, reactor tail gas collecting hood and reactor shell convergence part are provided with a circle overflow weir, overflow weir is communicated with described sewage rising pipe.
Further, ozone decomposed device is communicated with between offgas duct relief outlet and tail gas control valve.
Further, in reactor operational process, beds is in swelling state under the hydraulic action of sewage of intaking and reflux, and beds rate of expansion is 10%-30%.
Apply a sewage water treatment method for above-mentioned expanded bed catalytic ozonation reactor for treatment sewage, it is characterized in that comprising the following steps:
(1) treatment sewage is evenly distributed in expanded bed catalytic ozonation reactor lower part by water inlet distributor after water inlet pipe, ozone is evenly distributed in reactor bottom by ozone sparger after ozone inlet pipe, treatment sewage and ozone upwards flow through beds, and catalytic ozonation reaction occurs in beds;
(2) sewage overflow processed through step (1) enters rising pipe, and a sewage part is discharged to the outside through rising pipe relief outlet, and another part enters water sprayer aqueous phase entrance through sewage backflow pipe; The tail gas produced in step (1) reaction process enters offgas duct after exhaust collection cover is collected, a tail gas part is up to standard after the process of ozone decomposed device is expelled to reactor outside, and another part tail gas enters water sprayer gas phase entrance through tail gas return line;
(3) sewage refluxed and tail gas are mixed to form air-water mixture in water sprayer, and by pipeline be back to recirculation water gas sparger, enter in reactor and again participate in catalytic oxidation.
Further, reactor tail gas reflux ratio is 200 ~ 400%: sewage backflow ratio is 200 ~ 400%.
Further, the catalyzer loaded in reactor is pellet type catalyst, particle diameter 2 ~ 8mm.
Further, the effective hydraulic detention time of reactor is 0.5 ~ 1.0 hour.
The invention has the beneficial effects as follows and provide a kind of expanded bed catalytic ozonation reactor, for fields such as the difficult biochemical sewage pre-treatment of advanced treatment of wastewater, reusing sewage and high density, more traditional its ozone utilization rate of fixed bed catalytic oxidation reactor improves about 30%; Avoid the problem that conventional fixed-bed reactor regularly need carry out back flushing surely simultaneously, reduce reactor operation easier and automatic control level, avoid the channeling that conventional fixed bed catalytic reactor may exist, improve mass transfer ability and treatment effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of outer circulation sewage disposal catalytic ozonation reactor provided by the invention;
In figure:
1. ozone sparger; 2. ozone inlet pipe; 3. sewage water inlet pipe; 4. water inlet topping-up pump; 5. water inlet distributor; 6. reflux water/gas sparger; 7. catalyst support grid; 8. catalyzer bed course; 9. beds; 10. reactor outer wall; 11. overflow weirs; 12. exhaust collection covers; 13. offgas duct; 14. tail gas control valves; 15. ozone decomposed devices; 16. offgas duct relief outlets; 17. tail gas return lines; 18. rising pipes; 19. sewage control valves; 20. rising pipe relief outlets; 21. sewage backflow pipes; 22. recirculation water topping-up pumps; 23. water sprayers.
Embodiment
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, a kind of expanded bed catalytic ozonation reactor, reactor cross-section shape is circular or rectangle, bottom it, be upwards disposed with ozone sparger 1, water inlet distributor 5 and beds 9 in reactor outer wall 10 inside, reactor top is provided with offgas duct 13 and sewage rising pipe 18; Ozone sparger 1 connects ozone inlet pipe 2, and water inlet distributor 5 connects sewage water inlet pipe 3, and water inlet pipe 3 is provided with into water topping-up pump 4; Be provided with catalyzer bed course 8 below beds 9, below catalyzer bed course 8, be provided with catalyst support grid 7; Reactor 10 top is provided with exhaust collection cover 12, the cylindrical shell convergence part of exhaust collection cover 12 and reactor is provided with a circle overflow weir 11, the overflow port of overflow weir 11 is arranged on reactor outer wall 10 and is positioned at above the beds 9 and position be positioned at below exhaust collection cover 12, and overflow weir is communicated with sewage rising pipe 18.
Exhaust collection cover 12 top is communicated with offgas duct 13, offgas duct 13 and rising pipe 18 all there is relief outlet, offgas duct is provided with as tail gas return line 17, rising pipe 18 is provided with sewage backflow pipe 21, and tail gas return line 17 and sewage backflow pipe 21 are communicated to gas phase import and the aqueous phase import of water sprayer 23 respectively, water sprayer 23 export by pipeline connection to recirculation water gas sparger 6, described recirculation water gas sparger 6 to be arranged in reactor 10 and to be positioned at below catalyst support grid 7 and above water inlet distributor 5.Water sprayer also claims ejector, can by backflow sewage and tail gas Returning reactor bottom, make the tail gas that refluxes can when normal pressure even negative pressure, form air-water mixture with the sewage of backflow and get back to reactor and again participate in catalytic oxidation.
Offgas duct between offgas duct relief outlet 16 and tail gas return line 17 is provided with tail gas control valve 14, is communicated with ozone decomposed device 15 between tail gas control valve 14 with relief outlet 16; Pipeline between sewage backflow pipe 21 and rising pipe relief outlet 20 is provided with sewage control valve 19, and sewage backflow pipe 21 is provided with recirculation water topping-up pump 22.
Expanded bed catalytic ozonation reactor of the present invention is in operational process, beds is swelling state under the hydraulic action of influent stream sewage with backflow sewage, beds rate of expansion is 10%-30%, hydraulics needed for beds rate of expansion, proportion, particle diameter etc. according to used catalyzer are determined.
The method steps utilizing expanded bed catalytic ozonation reactor provided by the invention to carry out sewage disposal is as follows:
(1) treatment sewage enters water inlet pipe 3 after the supercharging of water inlet topping-up pump 4, reactor 10 bottom is evenly distributed in by water inlet distributor 5, ozone is evenly distributed in bottom reactor 10 by ozone sparger 1 after ozone inlet pipe 2, treatment sewage and ozone are to upper reaches, enter beds 9, in beds 9, there is catalytic ozonation reaction, remove the pollutent in sewage; Use catalyzer in catalytic ozonation reaction process, catalyzer is particulate state, and particle diameter is 2 ~ 8mm; Now, beds is in swelling state under the hydraulic action of ascending current, and rate of expansion is 10-30%.
(2) sewage processed through step (1) enters rising pipe 18 after being collected by overflow weir 11, a sewage part after process is discharged to the outside through rising pipe relief outlet 20, another part enters sewage backflow pipe 21, and sewage backflow is than controlling between 100 ~ 400% by sewage control valve 19 and backflow boosting pump 25; Backflow sewage enters the aqueous phase import of water sprayer 23 after topping-up pump 25 supercharging; What produce in step (1) reaction process enters offgas duct 13 containing ozone tail gas after exhaust collection cover 12 is collected, part tail gas is up to standard after ozone decomposed device 15 processes is expelled to outside, and another part tail gas enters the import of water sprayer 23 gas phase through tail gas return line 17; Tail gas reflux ratio controls between 100 ~ 400% by tail gas control valve 14;
(3) sewage refluxed and tail gas are mixed to form air-water mixture in water sprayer 23, and by pipeline be back to recirculation water in reactor 10 gas sparger 6, upper reaches enters beds 9, again participates in catalytic oxidation.
Catalyzer in reactor, under the effect of the sewage entered, ozone, backflow sewage and backflow ozone, in swelling state, avoids the problem that conventional fixed catalyst beds reactor regularly need carry out back flushing, reduces reactor operation easier and automatic control level; Determine the rising linear speed of sewage in reactor according to the rate of expansion etc. of the proportion of catalyzer, particle diameter and beds, make catalyzer reach required swelling state.In the present invention, the rate of expansion of beds is preferably 10%-30%.In addition, by the backflow of sewage and tail gas, make full use of remaining ozone in the ozone and tail gas dissolved in sewage, improve ozone utilization rate and the sewage disposal degree of depth.
The present invention's effective hydraulic detention time of reactor when carrying out catalytic oxidation is 0.5 ~ 1.0 hour.
For determining effect of the present invention, designing and producing expanded bed catalytic ozonation reactor provided by the present invention and fixed bed catalytic ozonation reactor respectively, and having carried out simultaneous test.Two kinds of reactor for treatment scales are 0.2m
3/ h, effective hydraulic detention time is 0.5 hour, all loads same particle size to be about 4mm with activated alumina be the loaded catalyst of carrier.Fixed bed catalytic ozonation reactor is sewage, ozone concurrent reactor, without sewage, tail gas backflow.Comparative test result is described below:
Embodiment 1:
Certain wastewater reusing device reverse osmosis concentrated water COD is at about 120mg/l, and adopt this strand of sewage as test water, comparative test result is in table 1.
Table 1 expanded bed catalytic ozonation reactor and fixed bed catalytic ozonation reactor comparative test result
Embodiment 2:
Certain chemical engineering sewage CODcr is at about 80mg/l, and using this sewage as test water, comparative test result is in table 2.
Table 2 expanded bed catalytic ozonation reactor and fixed bed catalytic ozonation reactor comparative test result
As can be seen from table 1, table 2 comparative test result, expanded bed catalytic ozonation reactor comparatively fixed bed catalytic ozonation reactor, ozone utilization rate is improved by a relatively large margin, and improves the sewage disposal degree of depth.At duration of test, fixed bed catalytic oxidation reactor often runs 6 days, backwash 1 time, and expanded bed catalyst oxidation reactor did not carry out back flushing.
Above to invention has been detailed introduction.Set forth principle of the present invention and embodiment herein, above explanation just understands core concept of the present invention for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (9)
1. an expanded bed catalytic ozonation reactor, inside reactor is upwards disposed with ozone sparger, inlet distribution device and beds from bottom, reactor top is provided with offgas duct and sewage rising pipe, it is characterized in that: offgas duct is provided with tail gas return line, sewage rising pipe is provided with sewage backflow pipe, and tail gas return line and sewage backflow pipe are communicated to gas phase import and the aqueous phase import of water sprayer respectively; Be provided with between beds and inlet distribution device recirculation water gas sparger, water sprayer outlet by pipeline connection to recirculation water gas sparger.
2. expanded bed catalytic ozonation reactor according to claim 1, is characterized in that: reactor head is provided with exhaust collection cover, and exhaust collection cover top is communicated with described offgas duct, is provided with tail gas control valve between offgas duct relief outlet and tail gas return line; Be provided with sewage control valve between sewage rising pipe relief outlet and sewage backflow pipe, sewage backflow pipe is provided with recirculation water topping-up pump; Ozone sparger is communicated with ozone inlet pipe, and inlet distribution device is communicated with water inlet pipe, and water inlet pipe is provided with into water topping-up pump; Be disposed with catalyzer bed course and catalyst support grid below beds, catalyst support grid is positioned at above Hui Liushui gas sparger.
3. expanded bed catalytic ozonation reactor according to claim 2, it is characterized in that: reactor tail gas collecting hood and reactor shell convergence part are provided with a circle overflow weir, overflow weir is communicated with described sewage rising pipe.
4. expanded bed catalytic ozonation reactor according to claim 3, is characterized in that: be communicated with ozone decomposed device between offgas duct relief outlet and tail gas control valve.
5. the expanded bed catalytic ozonation reactor according to any one of claim 1-4, it is characterized in that: in reactor operational process, beds is in swelling state under the hydraulic action of sewage of intaking and reflux, and beds rate of expansion is 10%-30%.
6. a sewage water treatment method, is characterized in that comprising the following steps:
(1) treatment sewage is evenly distributed in expanded bed catalytic ozonation reactor lower part by water inlet distributor after water inlet pipe, ozone is evenly distributed in reactor bottom by ozone sparger after ozone inlet pipe, treatment sewage and ozone upwards flow through beds, and catalytic ozonation reaction occurs in beds;
(2) sewage overflow processed through step (1) enters rising pipe, and a sewage part is discharged to the outside through rising pipe relief outlet, and another part enters water sprayer aqueous phase entrance through sewage backflow pipe; The tail gas produced in step (1) reaction process enters offgas duct after exhaust collection cover is collected, and a tail gas part is expelled to reactor outside after the process of ozone decomposed device, and another part tail gas enters water sprayer gas phase entrance through tail gas return line;
(3) sewage refluxed and tail gas are mixed to form air-water mixture in water sprayer, and by pipeline be back to recirculation water gas sparger, enter in reactor and again participate in catalytic oxidation.
7. sewage water treatment method according to claim 6, is characterized in that: reactor tail gas reflux ratio is 200 ~ 400%: sewage backflow ratio is 200 ~ 400%.
8. sewage water treatment method according to claim 6, is characterized in that: the catalyzer loaded in reactor is pellet type catalyst, particle diameter 2 ~ 8mm.
9. sewage water treatment method according to claim 6, is characterized in that: the effective hydraulic detention time of reactor is 0.5 ~ 1.0 hour.
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Cited By (5)
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| CN105347462A (en) * | 2015-12-09 | 2016-02-24 | 北京高能时代环境技术股份有限公司 | Fluidized bed type ozone oxidation tower |
| CN106630110A (en) * | 2017-03-01 | 2017-05-10 | 南京大学 | Integrated fluidized bed device for gradient ozone catalyzing and application of integrated fluidized bed device |
| CN106630106A (en) * | 2015-10-29 | 2017-05-10 | 宝山钢铁股份有限公司 | Method for removing total organic nitrogen in cold rolling thin oil electro adsorption concentrated water and apparatus thereof |
| CN109574198A (en) * | 2018-12-29 | 2019-04-05 | 苏州清然环保科技有限公司 | Ozone catalytic fluidized bed sewage processor and its application method |
| CN110803758A (en) * | 2019-12-05 | 2020-02-18 | 上海环境工程设计研究院有限公司 | Catalytic ozonation reactor for wastewater treatment |
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