CN203307147U - Fluidized bed reactor for advanced treatment of pulping and papermaking wastewater by Fenton method - Google Patents
Fluidized bed reactor for advanced treatment of pulping and papermaking wastewater by Fenton method Download PDFInfo
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- CN203307147U CN203307147U CN2013202819988U CN201320281998U CN203307147U CN 203307147 U CN203307147 U CN 203307147U CN 2013202819988 U CN2013202819988 U CN 2013202819988U CN 201320281998 U CN201320281998 U CN 201320281998U CN 203307147 U CN203307147 U CN 203307147U
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Abstract
The utility model discloses a fluidized bed reactor for advanced treatment of pulping and papermaking wastewater by a Fenton method. The fluidized bed reactor for advanced treatment of pulping and papermaking wastewater by the Fenton method comprises a Fenton reaction tank which is provided with a wastewater inlet and a first reagent inlet and a second reagent inlet which are used for adding Fenton reaction reagents; an outlet of the Fenton reaction tank is connected with an inlet of a pH regulating tank provided with a pH regulating liquid inlet; an outlet of the pH regulating tank is connected with an inlet of a degassing tank; an outlet of the degassing tank is connected with an inlet of a concrete reaction tank provided with an additive inlet; an outlet of the concrete reaction tank is connected with an inlet of a sedimentation tank; the sedimentation tank is provided with a sludge discharge outlet and a water drainage outlet. The fluidized bed reactor for advanced treatment of pulping and papermaking wastewater by the Fenton method provided by the utility model has the characteristics of small occupied area, simplicity in operation, no complex equipment, easiness in maintaining, environment friendliness and the like; the fluidized bed reactor for advanced treatment of pulping and papermaking wastewater by the Fenton method has a favorable removing effect for degradation-resistant organisms in pulping and papermaking comprehensive wastewater, can lower the chromaticity and COD (chemical oxygen demand) concentration of wastewater, and has a wide application prospect.
Description
Technical field
The utility model belongs to the mechanical means field, is specifically related to a kind of fluidized-bed reactor with Fenton method advanced treatment paper-making effluent.
Background technology
The Fenton oxidation technology is a kind of with H
2O
2For oxygenant, ferrous salt is the homogeneous catalysis oxidation technology of catalyzer, and the OH produced in reaction is the free radical that a kind of oxidation capacity is very strong, the organism in oxidable waste water, thereby colourity and the COD of reduction waste water.As a kind of high-level oxidation technology commonly used, the upgrading that Fenton family advanced oxidation treatment technology has experienced traditional Fenton method (being called for short the Fenton I), electrolytic oxidation-Fenton method (being called for short the Fenton II), electrolytic reduction-Fenton method (being called for short the Fenton III), fluidized-bed-Fenton method (being called for short the Fenton IV) improves.In recent years, the Fenton oxidation technology has obtained extensive concern in processing organic wastewater with difficult degradation thereby, compare other advanced oxidation processes, it has that operating process is simple, reactant is easy to get, expense is low, without complex apparatus, can not decompose produce new objectionable impurities, to follow-up processing toxicological harmless, the advantage such as environmentally friendly, be applied to gradually, in the waste water treatment engineerings such as pulping and paper-making, dyestuff, agricultural chemicals, to have good application prospect.
1, Fenton technology oxidation mechanism
Fenton reagent has very strong oxidation capacity, is because the Fe in Fenton reagent
2+Can be by H
2O
2Catalytic decomposition generates the hydroxyl radical free radical (OH) with very strong oxidation capacity, and its reaction mechanism is as follows:
Fe
2++H
2O
2→Fe
3++OH
－+·OH
Fe
3++H
2O
2→Fe
2++HO
2·+H
+
Fe
2++·OH→OH
－+Fe
3+
RH+·OH→R·+H
2O
R·+Fe
3+→R
++Fe
2+
R
++O
2→ROO
+→…→CO
2+H
2O
The hydroxyl radical free radical produced in reaction process (OH) has following critical function:
A hydroxyl radical free radical (OH) has extremely strong oxidizing property, and its oxidisability is only lower than F2;
B hydroxyl radical free radical (OH) has higher electronegativity, and the attack of hydroxyl radical free radical (OH) has selectivity;
C hydroxyl radical free radical (OH) has addition;
D H
2O
2Can react rapidly and generate hydroxyl radical free radical (OH), the hydroxyl radical free radical of generation (OH) can be applicable to different organic DeRs, and speed of response is very fast.
Fenton reaction is mainly to carry out the organism in degrading waste water by hydroxyl radical free radical (OH), thereby reaches COD(chemical oxygen demand (COD) in degrading waste water) effect.
2, the influence factor of Fenton reagent oxidation
From the research of top reaction mechanism to Fenton reagent method, recognize, in oxidized waste water, organic main component is hydroxyl radical free radical (OH), and the principal element that affects the output of hydroxyl radical free radical (OH) has ferrous sulfate, H
2O
2, pH and temperature of reaction etc.
2.1 pH value
Fenton reagent method is to react under the condition of solution slant acidity, if solution is in the situation of alkalescence or neutrality, reaction effect is not good.When this is bigger than normal because of pH, easily cause the Fe in solution
2+Generate precipitation and lose catalytic capability, thereby affect Fe
2+To H
2O
2Katalysis, further affect H
2O
2Decompose the production rate that generates hydroxyl radical free radical (OH).Lower than 3 the time, in solution, H+ concentration increases, to Fe when the pH value
3+Convert Fe to
2+Produce inhibition, also affect Fe
2+Catalysis H
2O
2Decompose the production rate that generates hydroxyl radical free radical (OH).
2.2 H
2O
2Add-on
In reaction, excessive H
2O
2Can hinder the generation of hydroxyl radical free radical (OH), thereby make in reaction, to organic oxidative degradation Efficiency Decreasing, in addition, to remain in H excessive in solution
2O2 can make in water the COD observed value bigger than normal.While H
2O
2Price comparison is expensive, and its add-on will directly determine the height of Fenton technical finesse waste water cost.Generally, in waste water the clearance of COD with H
2O
2The increase of add-on and rear downward trend occurs first increasing.
2.3 the add-on of catalyzer
Generally, in the Fenton reaction, using maximum catalyzer is FeSO
47H
2O, its Main Function promote H
2O
2Decompose and generate hydroxyl radical free radical (OH).Therefore the oxidation effectiveness of Fenton is affected by the add-on of ferrous sulfate directly.Along with Fe in solution
2+The continuous lifting of amount, the hydroxyl radical free radical (OH) that reaction produces also can increase then and descend; Because Fe in solution
2+Measure when too high, will make H
2O
2Produce invalid decomposition and generate H
2O and O
2, make the production rate of hydroxyl radical free radical (OH) not good, thereby cause the phenomenon not good to water treatment effect.
2.4 temperature of reaction
The mean kinetic energy of reactant molecule and speed of reaction all can increase along with the rising of temperature of reaction.In Fenton reaction, the activity of hydroxyl radical free radical (OH) also increases with the rising of temperature, thereby improves the speed of reaction of organism and hydroxyl radical free radical (OH) in waste water, has also improved the clearance of COD in waste water; But, when temperature is too high, can cause H
2O
2Decomposition generate H
2O and O
2, hydroxyl radical free radical (OH) is had a negative impact, cause the not good phenomenon of water treatment effect.
Existing high, the easy obstruction of Fenton fluidized-bed reactor sludge output, control condition complexity, speed of response are difficult to control, operation cost is high.
The utility model content
The purpose of this utility model is to overcome the problems referred to above, a kind of fluidized-bed reactor with Fenton method advanced treatment paper-making effluent is provided, hardly degraded organic substance in the wastepaper pulping and papermaking comprehensive wastewater is had to good removal effect, can reduce colourity and the COD concentration of waste water.
For achieving the above object, the technical solution adopted in the utility model is:
Comprise the Fenton reaction tank with waterwater entrance, the Fenton reaction tank is provided be used to the first reagent entrance that adds the Fenton reaction reagent and the second reagent entrance, the outlet of Fenton reaction tank is connected with the entrance in degassed pond, the outlet in degassed pond is connected with the entrance of coagulation reaction tank, coagulation reaction tank is provided with the additive entrance, the outlet of coagulation reaction tank is connected with the entrance of settling tank, and settling tank is provided with the mud discharging mouth and for the water port of the waste water after emission treatment.
The outlet of described Fenton reaction tank is connected with the entrance in pH regulator pond, and the outlet in pH regulator pond is connected with the entrance in degassed pond, and the ingress in pH regulator pond is provided with pH regulator liquid entrance.
The inwall of described Fenton reaction tank, pH regulator pond, degassed pond and coagulation reaction tank is equipped with preservative coat.
Described pH regulator is provided with agitator in pond.
Described the first reagent entrance is positioned at the waterwater entrance place of Fenton reaction tank; Described additive entrance is positioned at the ingress of coagulation reaction tank.
Described the first reagent entrance is connected with the lift pump be used to adding a Fenton reaction reagent; Described the second reagent entrance is connected with the recycle pump be used to adding the 2nd Fenton reaction reagent.
In described Fenton reaction tank, be provided with the jet-loop device for waste water and Fenton reaction reagent are mixed.
In described degassed pond, be provided with agitator, the bottom in degassed pond is provided with the perforation water distributor.
In described coagulation reaction tank, be provided with agitator.
In described settling tank, be provided with the guide shell for water conservancy diversion waste water, the water port place of settling tank is provided with effluent weir, and the mud discharging mouth of settling tank is connected with sludge pump.
Further, the quantity of described lift pump is two, and wherein one is standby.
Further, described recycle pump is selected corrosion-resistant chemical pump, and the quantity of recycle pump is two, and wherein one is standby.
Further, the circular flow of described jet-loop device is 15m
3/ h, quantity is 12.
Further, the quantity of described sludge pump is two, and wherein one is standby.
With respect to prior art, the utlity model has following beneficial effect:
In the utility model, the Fenton reaction reagent can directly add in the Fenton reaction tank, make the Fenton reaction reagent can be directly and the pollutant reaction in waste water generate carbonic acid gas, water and inorganics, can reach the purpose of removing COD, and can not produce secondary pollution, reduce the processing cost of mud.And in the utility model, increased especially degassed pond, in common Fenton method fluidized-bed operational process, the mud scum phenomenon can often occur in settling tank, and be accompanied by bubble and emerge, the major cause that this phenomenon occurs is the H added in system
2O
2Measure excessive, thereby make excessive H
2O
2Flow in settling tank H
2O
2In settling tank, decompose oxygen release, oxygen takes up the mud of precipitation in floating-upward process, causes suspended substance in water outlet SS(water quality) excessive concentration, therefore strict H
2O
2Addition is one of principal element guaranteed the normal operation of whole system.After the utility model increased degassed pond, waste water can be by wherein residual H in degassed pond
2O
2Remove, can prevent that mud scum from producing and prevention H
2O
2Affect the treatment effect of follow-up unit.The utility model has overcome existing Fenton fluidized-bed control condition complexity, the shortcoming that operation cost is high, hardly degraded organic substance in the wastepaper pulping and papermaking comprehensive wastewater is had to good removal effect, can reduce colourity and the COD concentration of waste water, have floor space little, simple to operate, without complex apparatus, for ease of maintenaince and the characteristics such as environmentally friendly, have broad application prospects.
Further, in the utility model, also increased especially the pH regulator pond, after Fenton occurs, waste water also will carry out flocculation precipitation reaction in follow-up coagulation reaction tank, need in coagulation reaction tank, add the additive for flocculation sediment, additive effect in certain pH scope is better, therefore by adding the pH regulator pond, in the pH regulator pond, add acid or alkaline pH regulator liquid, the pH value that makes to enter the waste water of coagulation reaction tank remains in the required pH scope of additive, thereby improves the treatment effect of subsequent step.
Further, in degassed pond, agitator is set in the utility model, can improves and remove H
2O
2Effect.
Further, the jet-loop device is set in the Fenton reaction tank in the utility model, can improves waste water in the Fenton reaction tank and the mixing uniformity of Fenton reaction reagent, improve reaction effect, make the decreasing ratio of COD higher.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Wherein: 1 is that Fenton reaction tank, 2 is that pH regulator pond, 3 is that degassed pond, 4 is that coagulation reaction tank, 5 is that settling tank, 6 is that lift pump, 7 is recycle pump.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Referring to Fig. 1, the utility model comprises Fenton reaction tank 1, pH regulator pond 2, degassed pond 3, coagulation reaction tank 4 and settling tank 5, the outlet of Fenton reaction tank is connected with the entrance in pH regulator pond, the outlet in pH regulator pond is connected with the entrance in degassed pond, the outlet in degassed pond is connected with the entrance of coagulation reaction tank, the outlet of coagulation reaction tank is connected with the entrance of settling tank, and settling tank is provided with the mud discharging mouth and for the water port of the waste water after emission treatment.
Wherein, the Fenton reaction tank arranges one, and its geometrical dimension is that 6m * 6m * 4.5m(is divided into 3 lattice), useful volume is 108m
3, the HRT(hydraulic detention time) and be 35min, adopt steel and concrete structure, inwall uses the anticorrosion cloth of being made by epoxy resin and reinforced plastic glass fibre anticorrosion.The Fenton reaction tank is provided with waterwater entrance, and the waterwater entrance place is provided be used to adding the first reagent entrance of Fenton reaction reagent, and the first reagent entrance is connected with the lift pump be used to adding a Fenton reaction reagent, and the flow of lift pump is 180m
3/ h, lift are that 8m, power are 5.5kW, and lift pump arranges two, and wherein one is standby.On the Fenton reaction tank, also be provided be used to adding the second reagent entrance of Fenton reaction reagent, the second reagent entrance is connected with the recycle pump be used to adding the 2nd Fenton reaction reagent, and the flow of recycle pump is 180m
3/ h, lift are that 5m, power are 4kW, and recycle pump is selected corrosion-resistant chemical pump, and recycle pump arranges two, and wherein one is standby.In the Fenton reaction tank, also being provided with 12 circular flows is 15m
3The stainless steel jet-loop device for waste water and Fenton reaction reagent are mixed of/h.
The pH regulator pond arranges one, and its geometrical dimension is 10m * 4m * 4.5m, and useful volume is 180m
3, adopting steel and concrete structure, inwall uses the anticorrosion cloth of being made by epoxy resin and reinforced plastic glass fibre anticorrosion.The ingress in pH regulator pond is provided with pH regulator liquid entrance.The agitator that is provided with diameter in the pH regulator pond and is 4m, rotating speed and be 100r/min, power and be 1.1kW is a set of.
Degassed pond arranges one, and its geometrical dimension is 10m * 4m * 4.5m, and useful volume is 180m
3, adopting steel and concrete structure, inwall uses the anticorrosion cloth of being made by epoxy resin and reinforced plastic glass fibre anticorrosion.The agitator that is provided with diameter in degassed pond and is 4m, rotating speed and be 100r/min, power and be 1.1kW is a set of.The bottom in degassed pond is provided with the perforation water distributor.
Coagulation reaction tank arranges one, and its geometrical dimension is 4m * 4m * 4m, and useful volume is 64m
3, adopting steel and concrete structure, inwall uses the anticorrosion cloth of being made by epoxy resin and reinforced plastic glass fibre anticorrosion.In coagulation reaction tank, being provided with diameter is that 4m, rotating speed are 120r/min, and power is that the agitator of 1.1kW is a set of.The ingress of coagulation reaction tank is provided with the additive entrance.
Settling tank: geometrical dimension is one of the vertical sedimentation basin of 10m * 5m * 4m, and useful volume is 200m
3, surface load is 3m
3/ (m
2H), HRT=2.4h.In settling tank, be provided with a set of guide shell for water conservancy diversion waste water, the water port place of settling tank is provided with effluent weir, and the mud discharging mouth of settling tank is connected with sludge pump, and the flow of sludge pump is 50m
3/ h, lift are 8m, and power is 3kW, and sludge pump arranges two, and wherein one is standby.
Working process of the present utility model is:
1. waste water is entered in the Fenton reaction tank by waterwater entrance, with lift pump by FeSO
4(Fenton reaction reagent) joins the Fenton reaction tank from the first reagent entrance, and with recycle pump by H
2O
2(Fenton reaction reagent) joins the Fenton reaction tank from the second reagent entrance, the Fenton reaction occurs in waste water and Fenton reaction reagent in the Fenton reaction tank, generation has the hydroxyl radical free radical of strong oxidizing property, oxidation operation in waste water is decomposed, thereby realize degraded COD and the effect that reduces colourity.
2. waste water, after the Fenton reaction tank carries out the Fenton reaction, enters the pH regulator pond.PH regulator liquid entrance in the pH regulator pond adds alkali (NaOH solution), makes the pH of exit, pH regulator pond waste water remain on 7.5～8.5; Enter the waste water in degassed pond, under the stirring action of agitator, by H residual in waste water
2O
2Remove, prevent the treatment effect of its follow-up unit of impact.
Waste water through pH regulator and degassed after enter coagulation reaction tank, in the additive entrance import of coagulation reaction tank, add the PAM(polyacrylamide) carry out flocculation sediment (PAM flocculation agent effect under pH neutrality or alkaline condition is best), the small iron mud flco produced in the front end operation is increased, improve the mud-water separation effect.
4. last waste water arrives settling tank, and the Main Function of settling tank is that the iron mud produced in reaction process is effectively separated with water, the direct discharging of waste water of clarification, and iron mud enters sludge thickener by the sludge pump discharge and processes.
Below enumerate the example of an actually operating.
According to the content of paper-making effluent COD, proportioning Fenton reaction reagent (FeSO
4And H
2O
2), FeSO wherein
4With H
2O
2Mass ratio be 2:1, by FeSO
4With H
2O
2Be made into respectively mass concentration and be 10% FeSO
4Solution and mass concentration are 30% H
2O
2Solution.Paper-making effluent enters in the Fenton reaction tank, and first at the first reagent entrance, adding mass concentration is 10% FeSO
4Solution, after the pH of waste water is down to below 4, adding mass concentration at the second reagent entrance is 30% H
2O
2Solution.In the Fenton reaction tank reaction after 15 minutes waste water enter the pH regulator pond, at pH regulator liquid entrance, adding mass concentration is 10% NaOH solution, the pH that regulates waste water is 8.Then waste water enters degassed pond, under the stirring action of agitator, by H residual in waste water
2O
2Remove, prevent H
2O
2Too much, the mud scum problem appears.Then waste water enters coagulation reaction tank, and at the additive entrance of coagulation reaction tank, adding mass concentration is 1 ‰ PAM solution, coagulation.Last waste water carries out the cement separation at settling tank, and clear water reaches emission standard.
Scale wastewater treatment engineering mesophytization system effluent COD concentration is usually in the 400mg/L left and right, and therefore according to laboratory test and data analysis, the addition of each material is as follows:
Mass concentration is 10% FeSO
4The addition of solution is 2kg/m
3
Mass concentration is 30% H
2O
2The addition of solution is 1.2L/m
3
Mass concentration is that the addition of 1 ‰ PAM solution is 1.3L/m
3
Mass concentration is that the addition of 10% NaOH solution is 1.7L/m
3.
By above condition, the utility model is as shown in table 1 to the result of waste water.
The result of table 1 the utility model to waste water
By table 1, can find out, the utility model has good removal effect to the hardly degraded organic substance in waste water, can significantly reduce colourity and the COD concentration of waste water, and the decreasing ratio of colourity and COD is all more than 90%.
In actual mechanical process, can select different Fenton reaction reagent and additive according to the difference of on-the-spot water quality, and regulate the consumption of Fenton reaction reagent and additive, reach the effect of colourity and COD concentration in good reduction waste water.
Claims (10)
1. fluidized-bed reactor with Fenton method advanced treatment paper-making effluent, it is characterized in that: comprise the Fenton reaction tank (1) with waterwater entrance, Fenton reaction tank (1) is provided be used to the first reagent entrance that adds the Fenton reaction reagent and the second reagent entrance, the outlet of Fenton reaction tank (1) is connected with the entrance of degassed pond (3), the outlet in degassed pond (3) is connected with the entrance of coagulation reaction tank (4), coagulation reaction tank (4) is provided with the additive entrance, the outlet of coagulation reaction tank (4) is connected with the entrance of settling tank (5), settling tank (5) is provided with the mud discharging mouth and for the water port of the waste water after emission treatment.
2. the fluidized-bed reactor with Fenton method advanced treatment paper-making effluent according to claim 1, it is characterized in that: the outlet of described Fenton reaction tank (1) is connected with the entrance of pH regulator pond (2), the outlet in pH regulator pond (2) is connected with the entrance of degassed pond (3), and the ingress of pH regulator pond (2) is provided with pH regulator liquid entrance.
3. the fluidized-bed reactor with Fenton method advanced treatment paper-making effluent according to claim 2, it is characterized in that: the inwall of described Fenton reaction tank (1), pH regulator pond (2), degassed pond (3) and coagulation reaction tank (4) is equipped with preservative coat.
4. the fluidized-bed reactor with Fenton method advanced treatment paper-making effluent according to claim 2, is characterized in that: be provided with agitator in described pH regulator pond (2).
5. the fluidized-bed reactor with Fenton method advanced treatment paper-making effluent according to claim 1, it is characterized in that: described the first reagent entrance is positioned at the waterwater entrance place of Fenton reaction tank (1); Described additive entrance is positioned at the ingress of coagulation reaction tank (4).
6. according to the described fluidized-bed reactor with Fenton method advanced treatment paper-making effluent of claim 1 or 4, it is characterized in that: described the first reagent entrance is connected with the lift pump (6) be used to adding a Fenton reaction reagent; Described the second reagent entrance is connected with the recycle pump (7) be used to adding the 2nd Fenton reaction reagent.
7. the fluidized-bed reactor with Fenton method advanced treatment paper-making effluent according to claim 1 is characterized in that: in described Fenton reaction tank (1), be provided with the jet-loop device for waste water and Fenton reaction reagent are mixed.
8. the fluidized-bed reactor with Fenton method advanced treatment paper-making effluent according to claim 1, it is characterized in that: in described degassed pond (3), be provided with agitator, the bottom of degassed pond (3) is provided with the perforation water distributor.
9. the fluidized-bed reactor with Fenton method advanced treatment paper-making effluent according to claim 1, it is characterized in that: described coagulation reaction tank is provided with agitator in (4).
10. the fluidized-bed reactor with Fenton method advanced treatment paper-making effluent according to claim 1, it is characterized in that: described settling tank is provided with the guide shell for water conservancy diversion waste water in (5), the water port place of settling tank (5) is provided with effluent weir, and the mud discharging mouth of settling tank (5) is connected with sludge pump.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202819988U CN203307147U (en) | 2013-05-22 | 2013-05-22 | Fluidized bed reactor for advanced treatment of pulping and papermaking wastewater by Fenton method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202819988U CN203307147U (en) | 2013-05-22 | 2013-05-22 | Fluidized bed reactor for advanced treatment of pulping and papermaking wastewater by Fenton method |
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ID=49613369
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|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103771624A (en) * | 2014-01-24 | 2014-05-07 | 华南理工大学 | Integrated fluidized catalytic oxidation tower and method for deeply treating wastewater by using same |
| CN105236625A (en) * | 2015-11-11 | 2016-01-13 | 苏州市环境保护有限公司 | Fenton printing-dyeing-wastewater deep treatment method |
| CN110723869A (en) * | 2019-10-09 | 2020-01-24 | 合肥停弦渡生物科技有限公司 | Improved Fenton sewage treatment method based on pre-oxidant |
-
2013
- 2013-05-22 CN CN2013202819988U patent/CN203307147U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103771624A (en) * | 2014-01-24 | 2014-05-07 | 华南理工大学 | Integrated fluidized catalytic oxidation tower and method for deeply treating wastewater by using same |
| CN103771624B (en) * | 2014-01-24 | 2014-12-31 | 华南理工大学 | Integrated fluidized catalytic oxidation tower and method for deeply treating wastewater by using same |
| CN105236625A (en) * | 2015-11-11 | 2016-01-13 | 苏州市环境保护有限公司 | Fenton printing-dyeing-wastewater deep treatment method |
| CN110723869A (en) * | 2019-10-09 | 2020-01-24 | 合肥停弦渡生物科技有限公司 | Improved Fenton sewage treatment method based on pre-oxidant |
| CN110723869B (en) * | 2019-10-09 | 2021-07-02 | 合肥停弦渡生物科技有限公司 | Improved Fenton sewage treatment method based on pre-oxidant |
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|---|---|---|---|
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| GR01 | Patent grant | ||
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Granted publication date: 20131127 Termination date: 20160522 |
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| CF01 | Termination of patent right due to non-payment of annual fee |