CN110981032A - Wastewater treatment device and treatment method thereof - Google Patents
Wastewater treatment device and treatment method thereof Download PDFInfo
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- CN110981032A CN110981032A CN201911400508.XA CN201911400508A CN110981032A CN 110981032 A CN110981032 A CN 110981032A CN 201911400508 A CN201911400508 A CN 201911400508A CN 110981032 A CN110981032 A CN 110981032A
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 25
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 111
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 107
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 97
- 239000002351 wastewater Substances 0.000 claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims description 46
- 239000007789 gas Substances 0.000 claims description 14
- 239000006185 dispersion Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims 6
- 238000010977 unit operation Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 230000003647 oxidation Effects 0.000 abstract description 9
- 238000007254 oxidation reaction Methods 0.000 abstract description 9
- 230000000593 degrading effect Effects 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 6
- 230000002195 synergetic effect Effects 0.000 abstract description 6
- 230000001590 oxidative effect Effects 0.000 abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 238000006864 oxidative decomposition reaction Methods 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 abstract 2
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 238000009775 high-speed stirring Methods 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 5
- 238000007142 ring opening reaction Methods 0.000 description 5
- 238000005273 aeration Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- -1 hydroxyl free radical Chemical class 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 150000003254 radicals Chemical class 0.000 description 3
- 239000011859 microparticle Substances 0.000 description 2
- 241000258957 Asteroidea Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003541 multi-stage reaction Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- 239000003440 toxic substance Substances 0.000 description 1
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Classifications
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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
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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
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Abstract
The application discloses a wastewater treatment device and a treatment method thereof. The wastewater treatment device is based on the combination of multiphase oxidation and high-speed mechanical rotation, adopts a mode of ozone and hydrogen peroxide layering and multi-position point feeding and utilizes a multi-layer impeller to carry out high-speed stirring by virtue of a mode of high-speed mechanical reinforcement and ozone combination, so that ozone and hydrogen peroxide are fully mixed and reacted and simultaneously utilize the synergistic effect of the ozone and the hydrogen peroxide to generate a hydroxyl radical with strong oxidizing property, the hydroxyl radical and water to be treated are fully mixed and reacted to carry out oxidative decomposition on organic matters difficult to biodegrade, the organic matters difficult to biochemically grade are opened and broken chains, and thus multiple effects of degrading the organic matters, improving the biodegradability of wastewater, detoxifying and the like are achieved, and the device has a good treatment effect on pretreatment before biochemical treatment of the waste water difficult to biodegrade and deep treatment of the biochemical degradation waste water with COD (chemical oxygen demand).
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a wastewater treatment device and a wastewater treatment method for degrading organic matters and improving wastewater treatment efficiency by opening and breaking chains of difficultly biochemical substances in a high-speed mechanical reinforced mixing mode.
Background
At present, many chemical industry wastewater has the characteristics of large water discharge, complex pollutant components, poor biodegradability and the like, and along with the improvement of the wastewater discharge standard and the requirement of sustainable development of enterprises by the national environmental protection department, the cyclic utilization of water resources is urgent. The effective pretreatment technology and the advanced treatment technology of the wastewater are key for solving the problem that the wastewater can reach the standard or meet the recycling requirement.
The wastewater discharged by industrial enterprises is high in organic matter concentration and salt content, contains biological toxic substances or high molecular organic matters which are difficult to biodegrade, can cause large impact on a biochemical system when directly entering the biochemical system, even the biochemical system is broken down, and at the moment, the part of the wastewater which is difficult to treat is required to be pretreated independently and then enters the biochemical system for mixing treatment;
after the wastewater discharged by industrial enterprises is subjected to secondary biochemical treatment, the B/C of the wastewater is already low, but the COD still cannot meet the standard discharge requirement or the requirement of a water inlet and reuse system, at the moment, the COD value needs to be further reduced or the B/C needs to be improved, and the traditional ozone oxidation technology or other traditional advanced oxidation technologies cannot meet the requirement, so that a more efficient advanced oxidation technology is needed.
Disclosure of Invention
In view of the above, the present application provides a wastewater treatment apparatus, which is based on the combination of heterogeneous oxidation and high-speed mechanical rotation, and adopts a multi-layer (e.g. double-layer) double-layer impeller mixer mechanical mixing, ozone and hydrogen peroxide layering, and multi-point feeding manner to fully mix and react air and water, so as to achieve a multi-action process and equipment for treating refractory organics, improving wastewater biodegradability, and detoxifying.
In order to achieve the above-mentioned purpose, the present application adopts the following scheme,
the waste water treatment device is characterized by comprising an ozone reactor, a water inlet and a water outlet, wherein the ozone reactor is provided with a water inlet communicated with a water inlet area; the water outlet is communicated with the water outlet area; at least one mixing zone, a reaction zone which is matched and connected with the mixing zone and a buffer zone are arranged in the reaction zone,
introducing water to be treated to a mixing zone through the water inlet; the mixing area disposes mixer, ozone and throws feeder apparatus, hydrogen peroxide solution and throw feeder apparatus, its difference electric connection control system, the mixer includes the motor, its output connect the mixer axle set up 2 at least group's impellers on the mixer axle, based on the instruction control system control ozone throw feeder apparatus work to throw ozone in the mixing area, control hydrogen peroxide solution throw feeder apparatus to throw in the mixing area and throw hydrogen peroxide solution, control the mixer operation passes through the rotation of mixer axle drives the impeller is rotatory for ozone gas that will throw and break into small particle size dispersion in aqueous, make gas, water intensive mixing.
Preferably, a first mixing zone, a first reaction zone in matching connection with the first mixing zone, a second reaction zone in matching connection with the second mixing zone and a buffer zone are arranged in the ozone reactor, and the first mixing zone are respectively provided with an ozone adding device, a hydrogen peroxide adding device and a stirrer;
the first mixing area is communicated with the water inlet area,
and the water treated by the second reaction zone flows to a buffer zone, the buffer zone is provided with through holes, and the water in the buffer zone overflows to the water outlet zone through the through holes.
Preferably, the first mixing area is provided with the first stirrer, which comprises a stirrer motor, an output shaft of the first stirrer motor is connected with a stirrer shaft, the stirrer shaft is provided with a first impeller and a second impeller, the first stirrer drives the first impeller and the second impeller to rotate based on the rotation of the stirrer shaft during operation, and the water in the first mixing area is stirred, so that the gas and the water are fully mixed and reacted.
Preferably, the first impeller is disposed on an end portion side of the mixer shaft, and the second impeller is disposed at a middle lower portion of the mixer shaft.
Preferably, the first mixing zone is provided with a first ozone adding port and a second ozone adding port which are respectively connected with the ozone adding device through pipelines, and the position of the second ozone adding port is lower than that of the first impeller in the horizontal position.
Preferably, the first mixing zone is provided with a first hydrogen peroxide adding port and a second hydrogen peroxide adding port which are respectively connected with a hydrogen peroxide adding device through pipelines, and the position of the second hydrogen peroxide adding port is higher than that of the first impeller in the horizontal position.
Preferably, the impeller of the first/second agitator is in the form of a parabolic-asymmetrically designed blade, which operates at a speed of not less than 125 rpm.
Preferably, the adding amount of the ozone and hydrogen peroxide H2O2The molar ratio of the added amount is 1: (0.3-0.7).
The embodiment of the application provides a wastewater treatment method, which is characterized by comprising the wastewater treatment device, and the method comprises the following steps:
s1, enabling wastewater to be treated to flow into a first mixing zone of a reactor;
s2, adding ozone O into the first mixing zone3Hydrogen peroxide H2O2Starting a first stirrer in the first mixing zone, and allowing water fully stirred by the first stirrer to flow to the first reaction zone;
s3, flowing the water after the reaction in the first reaction zone to a buffer zone;
and S4, when the water stored in the buffer area reaches a preset height, the water overflows to a water outlet area through the through holes.
The embodiment of the application provides a wastewater treatment method, which is characterized by comprising the wastewater treatment device, and the method comprises the following steps:
s11, allowing wastewater to be treated to flow into a first mixing zone of a reactor;
s12, adding ozone O into the first mixing area3Hydrogen peroxide H2O2Starting a first stirrer in the first mixing zone, and allowing water fully stirred by the first stirrer to flow to the first reaction zone;
s13, flowing the water after the reaction in the first reaction zone to a second mixing zone, and adding ozone O into the second mixing zone3Hydrogen peroxide H2O2Starting a second stirrer in the second mixing zone, and allowing the water fully stirred by the first stirrer to flow to a second reaction zone;
s14, flowing water after reaction in the second reaction zone to a buffer zone;
and S15, when the water stored in the buffer area reaches a preset height, the water overflows to a water outlet area through the through holes.
Advantageous effects
Compared with the prior art, the method has the advantages that the gas-water fully mixed reaction is realized by a high-speed mechanical enhanced ozone combination/mixing mode and a double-layer impeller stirrer mechanical mixing, ozone and hydrogen peroxide layering and multi-point feeding mode, meanwhile, a strong-oxidizing hydroxyl free radical is generated by utilizing the synergistic effect of the ozone and the hydrogen peroxide, and is fully mixed with water to be treated to perform oxidation decomposition on the difficultly-biodegradable organic matters, so that the difficultly-biochemical organic matters are subjected to ring opening and chain breaking, multiple effects of degrading the organic matters, improving the biodegradability of the wastewater, detoxifying and the like are realized, and the method has good treatment effects on pretreatment before biochemical treatment of the difficultly-degradable wastewater and deep treatment of the difficultly-biodegradable wastewater with the COD (chemical oxygen demand) of below 300mg/L after biochemical treatment.
Drawings
Other features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the invention and, together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic view showing the construction of a wastewater treatment apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the blender of FIG. 1;
FIG. 3 is a schematic view of the blender of FIG. 2 from another perspective;
FIG. 4 is a schematic view of a treatment process of a wastewater treatment apparatus according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The utility model provides a waste water treatment device based on multiphase oxidation and high-speed mechanical rotation combination, which adopts a double-layer impeller stirrer mechanical mixing mode, an ozone and hydrogen peroxide layering mode and a multi-position (multi-point for short) feeding mode to fully mix and react water and gas, thereby achieving the multi-function process and equipment for treating refractory organic matters, improving the biodegradability of waste water and detoxifying. The pretreatment before biochemical treatment of the difficultly-degradable wastewater and the advanced treatment of the difficultly-biodegradable wastewater with COD below 300mg/L after biochemical treatment have good treatment effects, and some defects of the conventional ozone treatment process at present are overcome. The working mechanism is as follows: by utilizing the synergistic effect of ozone and hydrogen peroxide, hydroxyl free radicals with strong oxidizing property are generated to be fully mixed and reacted with water to be treated to oxidize and decompose organic matters difficult to biodegrade, the hard biochemical substances are subjected to ring opening and chain breaking through high-speed rotation, so that multiple effects of degrading the organic matters, improving the biodegradability of wastewater and detoxifying are achieved, and then the COD is further reduced to reach the discharge standard or is directly discharged after reaching the standard in the next treatment process. The molecular formula is as follows: 2O3+H2O2→2OH+3O2。
This effluent treatment plant includes: a water inlet area, a (high-efficiency) ozone reactor, a water outlet area, a mechanical mixing reaction device, an ozone adding device, a hydrogen peroxide adding device and a control system. The ozone reactor is of a closed structure, an ozone adding device, a hydrogen peroxide adding device and an ozone reaction stirrer are arranged in the ozone reactor, the ozone reactor is used for efficiently dispersing injected ozone gas in liquid-phase wastewater in a micro-particle size mode, the ozone reactor is provided with a water inlet which is connected to a water inlet area through a pipeline, a water outlet which is connected to a water outlet area through a pipeline, and effluent treated by the ozone reactor flows to a next treatment process or is discharged to a preset water pool after reaching the standard.
Next, a wastewater treatment apparatus according to an embodiment of the present application will be described with reference to fig. 1 to 3. The wastewater treatment device 10 comprises a water inlet zone 1, an ozone reactor 2 and a water outlet zone 3; the ozone reactor 2 is internally provided with a first mixing zone 2-2, a first reaction zone 2-3, a second mixing zone 2-4, a second reaction zone 2-5, a buffer zone 2-6, an ozone adding device 2-12, a hydrogen peroxide adding device 2-13, a stirrer 2-14a/2-14b, a stirrer motor 2-15, a stirrer shaft 2-16 and an impeller 2-17, and can efficiently disperse ozone gas in liquid-phase wastewater with micro particle size, the water inlet of the high-efficiency reactor is connected with a water inlet zone, the water outlet is connected with a water outlet zone, and the water is discharged to a next treatment process or a water tank which reaches the standard. The high-efficiency ozone reactor preferably adopts a closed container structure reactor. The ozone reactor can be designed into other structural forms such as a steel-concrete structure or an all-steel structure according to actual requirements.
Next, referring to fig. 1 to describe the operation of the wastewater treatment apparatus, wastewater to be treated firstly enters a water inlet region 1, and then enters a reactor 2 (also referred to as an ozone reactor 2) through a water inlet 2-1 flowing into a first mixing region 2-2 by gravity, the first mixing region 2-2 is provided with an ozone adding apparatus 2-12a and a hydrogen peroxide adding apparatus 2-13a, which are respectively connected to an ozone sending apparatus 11b and a hydrogen peroxide storage portion 11a through pipelines, and the second mixing region 2-4 is provided with an ozone adding apparatus 2-12b and a hydrogen peroxide adding apparatus 2-13b, which are respectively connected to an ozone sending apparatus 11b and a hydrogen peroxide storage portion 11a through pipelines. And then ozone and hydrogen peroxide are added into the first mixing area 2-2 and the second mixing area 2-4. A first stirrer 2-14a is arranged in the first mixing area 2-2, a second stirrer 2-14b is arranged in the second mixing area 2-4, the gas and the water are fully mixed and reacted through a high-speed mechanical reinforced mixing mode of the first stirrer/the second stirrer, meanwhile, a hydroxyl free radical with strong oxidizing property is generated through the synergistic action of ozone and hydrogen peroxide, and is fully mixed and reacted with the water to be treated to oxidize and decompose the difficultly biodegradable organic matters, so that the difficultly biochemical organic matters are subjected to ring opening and chain breaking, multiple effects of degrading the organic matters, improving the biodegradability of the wastewater, detoxifying and the like are achieved, the effluent of the high-efficiency ozone reactor is converged into a water outlet area, and the effluent of the water outlet area is discharged after reaching the standard or is directly discharged after reaching the standard after further removing the organic matters in the wastewater in the next treatment process. In the present embodiment, the first stirrer and the second stirrer have the same structure, and a radial flow impeller is used. In other embodiments, an axial flow impeller may be employed.
The structure of the first mixer will be described with reference to fig. 2 and 3, the first mixer includes a mixer motor 2-15, an output end of which is connected to a mixer shaft 2-16, a first impeller 2-17a and a second impeller 2-17b which are arranged on the mixer shaft 2-16 at intervals, and the first mixer is operated to rotate the first/second impellers based on the rotation of the mixer shaft 2-16 to mix water therein, so that the gas and the water are mixed and reacted sufficiently. The first impeller 2-17a is disposed on the end side of the mixer shaft 2-16, and the second impeller 2-17b is disposed at the middle-lower portion of the mixer shaft 2-16. In the embodiment, the reactor is provided with two-stage double-layer ozone O feeding3Hydrogen peroxide H2O2Through high-speed mechanical enhanced mixing and simultaneously utilizing the synergistic effect of ozone and hydrogen peroxide, hydroxyl free radicals with strong oxidizing property are generated to be fully mixed and reacted with water to be treated to oxidize and decompose difficultly biodegradable organic matters, so that the difficultly biodegradable substances are subjected to ring opening and chain breaking, and multiple functions of degrading the organic matters, improving the biodegradability of wastewater, detoxifying and the like are achieved.
The ozone adding device 2-12a is connected to the first ozone adding port 12a1 and the second ozone adding port 12a2 through a preset pipeline, wherein the position of the second ozone adding port 12a2 is lower than that of the first impeller 2-17a in the horizontal position, and by the design, after ozone is added (injected) through the second ozone adding port 12a2, the ozone floats upwards and is diffused based on the rotation of the first impeller. And the hydrogen peroxide adding device 2-13b is connected to the first hydrogen peroxide adding port 13a1 and the second hydrogen peroxide adding port 13a2 through a preset pipeline, and the position of the second hydrogen peroxide adding port 13a2 is higher than that of the first impeller 2-17a in the horizontal position. In the design of two groups of impellers of the stirrer, the impellers can rotate at the same angular speed during operation, and the linear speeds of the impellers of the upper layer and the lower layer can be the same or different. In one embodiment, the upper and lower impellers may be of the same form (both the upper and lower impellers may be radial flow impellers) or may be different (the upper impeller may be an axial flow impeller and the lower impeller may be a radial flow impeller). In one embodiment, the pipes connected to the first ozone adding port 12a1 and the second ozone adding port 12a2 (preferably, the first ozone adding port 12a1 and the second ozone adding port 12a2 are disposed at one end of the pipe) are provided with a plurality of through holes (a pipe (also called an adding ring) with through holes (the plane of the adding ring is parallel to the horizontal plane), the through holes are disposed in a circular hole shape, an elliptical hole shape, a square hole shape, a pentagram shape, a starfish shape, etc., by such a design, part of the added ozone flows out through the through holes, so that the ozone flowing into the water is dispersed as much as possible and is sufficiently dispersed by the impeller.
In one embodiment, the first-stage/second-stage mixers are electrically connected to the control module respectively, and the rotation speed of the first-stage/second-stage mixers is controlled by the frequency conversion of the control module. In other embodiments, multiple sets (multiple tiers) of impellers of the blender.
In other embodiments, the reactor is configured with multiple stages and multiple layers of ozone O3Hydrogen peroxide H2O2。
The embodiment of the present application also provides a wastewater treatment method (also called treatment process) based on a single-stage wastewater treatment device combining multi-phase oxidation and high-speed mechanical enhanced ozone mixing, which is shown in fig. 4 and comprises the following steps:
s1, enabling wastewater to be treated to flow into a first mixing zone of a reactor;
s2, adding ozone O into the first mixing zone3Hydrogen peroxide H2O2Starting a first stirrer in the first mixing zone, and allowing water fully stirred by the first stirrer to flow to the first reaction zone;
s3, flowing the water after the reaction in the first reaction zone to a buffer zone;
and S4, when the water stored in the buffer area reaches a preset height, the water overflows to a water outlet area through the through holes.
In S2 of the present embodiment, the first stirrer in the first mixing zone is started by the variable frequency method (low to high frequency method).
The embodiment of the application also provides a wastewater treatment method (also called a treatment process) based on a two-stage wastewater treatment device combining multiphase oxidation and high-speed mechanical enhanced ozone mixing, which comprises the following steps: s11, allowing wastewater to be treated to flow into a first mixing zone of a reactor;
s12, adding ozone O into the first mixing area3Hydrogen peroxide H2O2Starting a first stirrer in the first mixing zone, and allowing water fully stirred by the first stirrer to flow to the first reaction zone;
s13, flowing the water after the reaction in the first reaction zone to a second mixing zone, and adding ozone O into the second mixing zone3Hydrogen peroxide H2O2Starting a second stirrer in the second mixing zone, and allowing the water fully stirred by the first stirrer to flow to a second reaction zone;
s14, flowing water after reaction in the second reaction zone to a buffer zone;
and S15, when the water stored in the buffer area reaches a preset height, the water overflows to a water outlet area through the through holes. According to the embodiment, based on the high-speed rotation of the stirrer in the first mixing area/the second mixing area and the synergistic effect of ozone and hydrogen peroxide, the strong-oxidizing hydroxyl free radicals are generated to be fully mixed and reacted with the water to be treated, and then the organic matters which are difficult to biodegrade in the wastewater are subjected to oxidative decomposition, so that the organic matters are subjected to ring opening and chain breaking, and multiple effects of degrading the organic matters, improving the biodegradability of the wastewater and detoxifying are achieved. The mode of ozone and hydrogen peroxide water layering and multipoint adding in the reactor is different from the traditional aeration disc aeration type, jet aeration type and the like, so that the reactor has the characteristics of higher gas dispersion efficiency, no minimum height requirement on the height of a tank body or the reactor, small occupied area, short retention time, difficulty in blockage and the like. In this embodiment, the second stirrer is started by a sampling frequency conversion method.
Preferably, the water in the water outlet area reaches the standard and is discharged after organic matters in the wastewater are further removed in the next treatment process or directly discharged after reaching the standard.
In one embodiment, the ozone reactor can adjust the adding proportion of the hydrogen peroxide or does not add the hydrogen peroxide according to the actual needs (such as the water quality requirements of inlet and outlet water).
Further, ozone O in the S2/S33Hydrogen peroxide H2O2The adding mol ratio is 1: 0.3 to 0.7. Namely, the consumption is about every 1kgCOD is removed1.5 kg-2.2 kg of ozone O3。
Further, the impeller of the first/second stirrer is in the form of a blade with a parabolic-asymmetric design. Preferably, the impeller is operated at a speed of not less than 125rpm, so that the ozone gas can be effectively cut and uniformly dispersed in the liquid phase without flooding. The first impeller adopts a radial flow impeller, and the second impeller adopts a radial flow impeller or an axial flow impeller. At least 2 groups of impellers and at least 2 layers (at least 2 layers of impellers in the horizontal direction) are arranged on the mixer shaft.
Further, the reactor can be designed into a single-stage or multi-stage reaction (i.e. when the reactor is single-stage, there is no second mixing zone/second reaction zone, and when the reactor is multi-stage, there are matching mixing zones/reaction zones with increased response) according to actual requirements (such as water quality requirements of inlet and outlet water).
Furthermore, the ozone adding position point is preferably arranged below each layer of impeller, and the hydrogen peroxide adding point is arranged above each layer of impeller, so that the ozone gas forms micro bubbles to fully mix and react with the wastewater through the lifting and shearing action of the impeller, and simultaneously reacts with the hydrogen peroxide to generate strong oxidizing hydroxyl radicals which can oxidize basic organic matters.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All modifications made according to the spirit of the main technical scheme of the invention are covered in the protection scope of the invention.
Claims (10)
1. A wastewater treatment device is characterized by comprising an ozone reactor, a water inlet and a water outlet, wherein the ozone reactor is provided with a water inlet and communicated with a water inlet area; the water outlet is communicated with the water outlet area; at least one mixing area, a reaction area and a buffer area which are matched and connected with the mixing area are arranged in the reaction area, and water to be treated is led to the mixing area through the water inlet;
the mixing area is provided with a stirring device, an ozone adding device and a hydrogen peroxide adding device which are respectively electrically connected with a control system, the stirring device comprises a motor, the output end of the motor is connected with a mixer shaft, at least 2 groups of impellers are arranged on the mixer shaft,
based on the instruction control system control ozone is thrown feeder apparatus work to throw with ozone in the mixing area, control hydrogen peroxide solution is thrown feeder apparatus to throw with hydrogen peroxide solution in the mixing area, control agitating unit operation passes through the rotation of mixer axle drives the impeller is rotatory for break up into the small particle size dispersion in aqueous with the ozone gas of throwing and make gas, water intensive mixing.
2. The wastewater treatment device according to claim 1, wherein a first mixing zone, a first reaction zone connected with the first mixing zone in a matching manner, a second mixing zone, a second reaction zone connected with the second mixing zone in a matching manner and a buffer zone are arranged in the ozone reactor, and the first mixing zone and the second mixing zone are respectively provided with an ozone adding device, a hydrogen peroxide adding device and a stirring device; the first mixing area is communicated with the water inlet area, the water treated by the second reaction area flows to the buffer area, the buffer area is provided with through holes, and the water in the buffer area overflows to the water outlet area through the through holes.
3. The wastewater treatment apparatus according to claim 2, wherein the first mixing zone is provided with a first stirring device comprising a stirrer motor having an output shaft connected to a stirrer shaft, the stirrer shaft being provided with a first impeller and a second impeller, the first stirring device being operated to rotate the first impeller and the second impeller based on the rotation of the stirrer shaft, and stir the water in the first mixing zone to allow the gas and the water to be mixed and reacted sufficiently.
4. The wastewater treatment apparatus according to claim 3, wherein the first impeller is disposed at an end of the mixer shaft, the second impeller is disposed at a lower middle portion of the mixer shaft, and the first impeller and the second impeller are radial flow impellers or axial flow impellers.
5. The wastewater treatment device of claim 3, wherein the first mixing zone is provided with a first ozone adding port and a second ozone adding port which are respectively connected with the ozone adding device through pipelines, and the position of the second ozone adding port is lower than that of the first impeller in the horizontal position.
6. The wastewater treatment device of claim 3, wherein the first mixing zone is provided with a first hydrogen peroxide adding port and a second hydrogen peroxide adding port which are respectively connected with the hydrogen peroxide adding device through pipelines, and the position of the second hydrogen peroxide adding port is higher than that of the first impeller on the horizontal position.
7. The wastewater treatment plant of claim 1 wherein the impeller is operated at a speed of not less than 125 rpm.
8. The wastewater treatment apparatus according to claim 1, wherein the molar ratio of the amount of ozone added to the amount of hydrogen peroxide added is 1: 0.3 to 0.7.
9. A method for treating wastewater, comprising the wastewater treatment apparatus according to any one of claims 1 to 8, the method comprising the steps of:
s1, enabling wastewater to be treated to flow into a first mixing zone of a reactor;
s2, adding ozone O into the first mixing zone3Hydrogen peroxide H2O2Starting a first stirrer in the first mixing zone, and allowing water fully stirred by the first stirrer to flow to the first reaction zone;
s3, flowing the water after the reaction in the first reaction zone to a buffer zone;
and S4, when the water stored in the buffer area reaches a preset height, the water overflows to a water outlet area through the through holes.
10. A method for treating wastewater, comprising the wastewater treatment apparatus according to any one of claims 1 to 8, the method comprising the steps of:
s11, allowing wastewater to be treated to flow into a first mixing zone of a reactor;
s12, adding ozone O into the first mixing area3Hydrogen peroxide H2O2Starting a first stirrer in the first mixing zone, and allowing water fully stirred by the first stirrer to flow to the first reaction zone;
s13, flowing the water after the reaction in the first reaction zone to a second mixing zone, and adding ozone O into the second mixing zone3Hydrogen peroxide H2O2Starting a second stirrer in the second mixing zone, and allowing the water fully stirred by the first stirrer to flow to a second reaction zone;
s14, flowing water after reaction in the second reaction zone to a buffer zone;
and S15, when the water stored in the buffer area reaches a preset height, the water overflows to a water outlet area through the through holes.
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