CN115028294B - Recycling integrated magnetic catalytic oxidation wastewater treatment system - Google Patents
Recycling integrated magnetic catalytic oxidation wastewater treatment system Download PDFInfo
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- CN115028294B CN115028294B CN202210847201.XA CN202210847201A CN115028294B CN 115028294 B CN115028294 B CN 115028294B CN 202210847201 A CN202210847201 A CN 202210847201A CN 115028294 B CN115028294 B CN 115028294B
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 115
- 238000004064 recycling Methods 0.000 title claims abstract description 17
- 230000003647 oxidation Effects 0.000 title claims abstract description 13
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 13
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 12
- 239000003054 catalyst Substances 0.000 claims abstract description 232
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 160
- 238000011084 recovery Methods 0.000 claims abstract description 76
- 239000002351 wastewater Substances 0.000 claims abstract description 32
- 238000004891 communication Methods 0.000 claims abstract description 8
- 239000007800 oxidant agent Substances 0.000 claims description 61
- 230000001590 oxidative effect Effects 0.000 claims description 51
- 238000010992 reflux Methods 0.000 claims description 37
- 238000010438 heat treatment Methods 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 12
- 239000003814 drug Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 238000011001 backwashing Methods 0.000 claims description 2
- 239000000945 filler Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Chemical compound [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000012425 OXONE® Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 235000019395 ammonium persulphate Nutrition 0.000 description 1
- 230000003115 biocidal effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- LFINSDKRYHNMRB-UHFFFAOYSA-N diazanium;oxido sulfate Chemical compound [NH4+].[NH4+].[O-]OS([O-])(=O)=O LFINSDKRYHNMRB-UHFFFAOYSA-N 0.000 description 1
- YMGGAHMANIOXGP-UHFFFAOYSA-L disodium;oxido sulfate Chemical compound [Na+].[Na+].[O-]OS([O-])(=O)=O YMGGAHMANIOXGP-UHFFFAOYSA-L 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical group O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical class [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- OKBMCNHOEMXPTM-UHFFFAOYSA-M potassium peroxymonosulfate Chemical compound [K+].OOS([O-])(=O)=O OKBMCNHOEMXPTM-UHFFFAOYSA-M 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 235000019394 potassium persulphate Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention relates to a recycling integrated magnetic catalytic oxidation wastewater treatment system, which comprises a pretreatment unit, a plurality of wastewater treatment units, a plurality of catalyst recovery units, a post-treatment unit and a control unit, wherein the pretreatment unit is connected with the plurality of wastewater treatment units in parallel through pipelines, and each wastewater treatment unit is correspondingly connected with one catalyst recovery unit; the control unit is in communication connection with other units; the catalyst recovery unit comprises a magnetic recovery conveyor belt, a catalyst collection tank and a water collecting tank, wherein the catalyst collection tank is arranged on one side below the magnetic recovery conveyor belt, and the water collecting tank is arranged on the other side below the magnetic recovery conveyor belt; the post-treatment unit is connected in parallel with a plurality of water collecting tanks of the catalyst recovery units through pipelines and is used for receiving wastewater separated from the catalyst; the next-stage wastewater treatment unit is connected with the catalyst collecting tank of the previous-stage catalyst recovery unit and is used for utilizing the catalyst used by the previous-stage wastewater treatment unit.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a recycling integrated magnetic catalytic oxidation wastewater treatment system.
Background
With the development of the industry in China, a large amount of industrial wastewater is generated each year, and various toxic and difficultly-degradable organic pollutants are contained in the wastewater, so that the wastewater is discharged into the environment without treatment, and the pollution of natural water and soil is inevitably caused, thereby threatening the ecological environment and human health. Currently, the main organic wastewater treatment technologies include flocculation precipitation, adsorption, microbial treatment, chemical oxidation, and the like. The advanced oxidation technology has the characteristics of green and high efficiency, and is widely applied, and mainly comprises Fenton (like) technology, activated persulfate technology and photocatalytic oxidation technology.
At present, a great difficulty in the advanced oxidation technology is that the catalyst is recovered and reused. The recovery of the catalyst is mainly carried out by magnetic separation technology aiming at the magnetic catalyst at present. Patent 202110986126.0 discloses an upflow fluidized bed reaction device and a method for treating antibiotic wastewater, wherein a magnetic catalyst is formed into a fluidized state in the wastewater by aeration, catalytic degradation reaction is carried out, the treated wastewater is discharged into a separator for magnetically separating the catalyst, and finally the treated wastewater is discharged. The separation process and the device have the biggest problems that the catalyst is separated in the recovery process and the recycling process, the recovered catalyst needs to be collected and stored for a period of time and then put into the next batch of wastewater treatment, and the catalysts with different times of use are often mixed and uniformly stored, so that the catalyst is not friendly to large systems for systematic, integrated and efficient wastewater treatment, and the catalyst utilization efficiency is not high.
Disclosure of Invention
Aiming at the problems, the invention provides a recycling integrated magnetic catalytic oxidation wastewater treatment system, which can treat organic wastewater efficiently and solve the problems that the magnetic catalyst cannot be continuously utilized after being recycled and has lower automation degree.
The recycling integrated magnetic catalytic oxidation wastewater treatment system comprises a pretreatment unit, a plurality of wastewater treatment units, a plurality of catalyst recovery units, a post-treatment unit and a control unit, wherein the pretreatment unit is connected with the plurality of wastewater treatment units in parallel through pipelines, and each wastewater treatment unit is correspondingly connected with one catalyst recovery unit; the control unit is in communication connection with the pretreatment unit, the wastewater treatment units, the catalyst recovery units and the post-treatment unit;
the catalyst recovery unit comprises a magnetic recovery conveyor belt, a catalyst collection tank and a water collecting tank, wherein the catalyst collection tank is arranged on one side below the magnetic recovery conveyor belt, and the water collecting tank is arranged on the other side below the magnetic recovery conveyor belt;
the post-treatment unit is connected in parallel with a plurality of water collecting tanks of the catalyst recovery units through pipelines and is used for receiving wastewater separated from the catalyst; the next-stage wastewater treatment unit is connected with the catalyst collecting tank of the previous-stage catalyst recovery unit and is used for utilizing the catalyst used by the previous-stage wastewater treatment unit.
Optionally, the wastewater treatment unit is cylindrical, and is provided with a water distribution area, a wastewater treatment area, a reflux area and an overflow area from bottom to top; the bottom of the water distribution area is provided with a second water inlet, a carrier supporting plate is arranged between the water distribution area and the wastewater treatment area, a carrier separation net is arranged between the wastewater treatment area and the backflow area, an overflow weir is arranged between the backflow area and the overflow area, and an outlet of the overflow weir is provided with a second water outlet for outputting the feed liquid treated by the wastewater treatment unit.
Further optionally, two sides of the water distribution area are respectively provided with a catalyst inlet and an oxidant inlet, two sides of the reflux area are respectively provided with a catalyst reflux outlet and an oxidant reflux outlet, and an oxidant medicament pond is arranged between the oxidant reflux outlet and the oxidant inlet; preferably, a catalyst agent pool is arranged between the catalyst reflux outlet and the catalyst inlet of the first wastewater treatment unit.
Optionally, the bottom of the water distribution area comprises a water distribution pipeline, and a catalyst distribution pipeline and an oxidant distribution pipeline above the water distribution pipeline, so that the water inlet, the catalyst and the oxidant are uniformly dispersed and uniformly mixed;
the water distribution pipeline comprises a plurality of radial branch pipes and a central inlet, the radial branch pipes are radial, the second water inlet is connected with the central inlet, and each radial branch pipe is uniformly provided with a plurality of water distribution nozzles;
the catalyst distribution pipeline is a first annular coil pipe, an inlet of the catalyst distribution pipeline is connected with a catalyst inlet, and a plurality of catalyst nozzles are uniformly arranged on the upper surface of the first annular coil pipe;
the oxidant distribution pipeline is a second annular coil pipe, an inlet of the oxidant distribution pipeline is connected with an oxidant inlet, and a plurality of oxidant nozzles are uniformly arranged on the upper surface of the second annular coil pipe.
Optionally, the catalyst recovery unit comprises a triangular magnetic recovery conveyor belt, a water outlet nozzle above the triangular magnetic recovery conveyor belt, and a catalyst collecting tank and a water collecting tank below the triangular magnetic recovery conveyor belt, wherein the water outlet nozzle is connected with a second water outlet of the corresponding wastewater treatment unit;
the magnetic force recycling conveyor belt is supported by three points of a vertex rotating shaft, a short side rotating shaft and a long side rotating shaft to form a triangle with a long side, a short side and a horizontal bottom side, the water outlet nozzle is positioned above the long side, and a magnetic force device is arranged on the lower surface of the long side; the catalyst collecting tank is arranged below the horizontal bottom edge and near one end of the short-side rotating shaft, and the water collecting tank is arranged below the horizontal bottom edge and near one end of the long-side rotating shaft.
Optionally, the magnetic force device is a plurality of permanent magnet rollers which are closely arranged, and the permanent magnet rollers are clung to the lower surface of the long side and are used for attracting the magnetic catalyst in the wastewater on the long side conveyor belt.
Optionally, the magnetic device is a magnetic conveyer belt, the magnetic conveyer belt takes the vertex rotating shaft and the long side rotating shaft as supports, and rotates under the drive of the vertex motor and the long side motor, the upper surface of the magnetic conveyer belt is clung to the lower surface of the long side of the magnetic recovery conveyer belt and moves to attract the catalyst to climb upwards, and after the catalyst reaches the vertex rotating shaft, the magnetic conveyer belt is separated from the short side to lose magnetic attraction, and the catalyst falls into a catalyst collecting tank below from the short side to be recovered.
Further optionally, a rolling brush is arranged at the position, close to the short-side rotating shaft, of the horizontal bottom edge, and the rolling brush is in contact with the lower surface of the horizontal bottom edge.
Optionally, a stirring device is arranged in the catalyst collecting tank, the bottom outlet is connected with the catalyst agent tank of the next wastewater treatment unit through a pipeline, and the catalyst reflux outlet of the next wastewater treatment unit is connected with the catalyst collecting tank through a pipeline and is used for introducing the reflux wastewater of the next wastewater treatment unit into the catalyst collecting tank, and under the action of the stirring device, a suspension is formed with the collected catalyst and is input into the next wastewater treatment unit for continuous use.
In the wastewater treatment unit, the catalyst is mainly Fe 3 O 4 Catalytic oxidative degradation of pollutants in wastewater while Fe 3 O 4 Fe may also be formed 2 O 3 And/or FeO, fe 2 O 3 The Fe-B-based alloy has weak magnetism, feO has no magnetism, and a magnetic recycling conveyor belt can recycle Fe 3 O 4 And most of Fe 2 O 3 FeO and a small part of Fe 2 O 3 The wastewater enters a water collecting tank and cannot be recycled, so that the catalyst is wasted. Meanwhile, the catalyst particles fully contact, rub and collide with the first filler and the second filler, so that the physical size of the catalyst is reduced, the catalyst is favorable for catalytic degradation treatment of wastewater, but is unfavorable for recovery of a magnetic recovery conveyor belt, and small-particle catalyst also enters a water collecting tank along with the wastewater. In view of the above problems, the present invention proposes the following preferred embodiments.
Preferably, a third filter screen and a bottom rotating shaft which is movably connected with the third filter screen are arranged at the top of the water collecting tank; the side surface of the catalyst collecting tank and the water collecting tank is provided with a heating device for heatingThe device is connected with the water collecting tank and the catalyst collecting tank through a first conveyor belt and a second conveyor belt respectively; the third filter screen can rotate at the top of the water collecting tank and above the first conveyor belt by taking the bottom rotating shaft as a fulcrum, namely the third filter screen can cover the top of the water collecting tank and is used for intercepting and recycling iron-containing oxide solids, the third filter screen rotates, the intercepted solids are overturned and poured onto the first conveyor belt, and then the intercepted solids are input into a heating device for heating, so that FeO is converted into Fe 3 O 4 And then the regenerated catalyst is conveyed to a catalyst collecting tank through a second conveyor belt for the next wastewater treatment unit.
Preferably, the heating device is connected with an oxygen supply device and can control the supply amount of oxygen.
Optionally, the post-treatment unit is provided with a plurality of third water inlets and a third water outlet, and each third water inlet is connected with the corresponding water collecting tank of the catalyst recovery unit through a pipeline and a water pump.
According to the wastewater treatment system, the number of times that the catalyst can be recycled can be determined according to the actual catalyst utilization condition, so that the number of the wastewater treatment units and the catalyst recovery units can be further determined, and the wastewater treatment units and the catalyst recovery units at the same stage are used in series. The catalyst reflux outlet of the first-stage wastewater treatment unit is sequentially connected with the catalyst agent pool and the catalyst inlet of the unit. The catalyst reflux outlet of the subsequent wastewater treatment unit is sequentially connected with the catalyst collecting tank of the catalyst recovery unit of the previous stage, the catalyst agent tank of the unit and the catalyst inlet, so that the next stage wastewater treatment unit utilizes the catalyst recovered by the previous stage wastewater treatment unit without additionally supplementing a new catalyst, the catalyst is recovered in a grading manner, and the recovered catalyst is utilized in the next stage wastewater treatment unit to the maximum extent.
The last catalyst recovery unit may not be connected to a subsequent wastewater treatment unit, and no stirring device may be installed in the catalyst collecting tank of the unit.
Drawings
FIG. 1 is a schematic diagram of a recycling integrated magnetic catalytic oxidation wastewater treatment system;
FIG. 2 is a schematic diagram of a water distribution pipeline;
fig. 3 is a catalyst distribution conduit and an oxidant distribution conduit.
In the drawing, the 1-pretreatment unit, 101-first water inlet, 102-first water outlet, 2-wastewater treatment unit, 201-water distribution area, 202-wastewater treatment area, 203-carrier tray, 204-carrier screen, 205-overflow weir, 206-catalyst inlet, 207-oxidant inlet, 208-catalyst return outlet, 209-oxidant return outlet, 210-catalyst agent tank, 211-oxidant agent tank, 212-water distribution pipe, 2121-radiation branch pipe, 2122-central inlet, 2123-water distribution nozzle, 213-catalyst distribution pipe, 2131-catalyst nozzle, 214-oxidant distribution pipe, 2141-oxidant nozzle, 3-catalyst recovery unit, 301-magnetic recovery conveyor, 302-water outlet nozzle, 303-long side, 304-short side, 305-horizontal side, 306-roll brush, 4-post treatment unit, 401-third water inlet, 402-third water outlet, 5-control unit, 6-catalyst collection tank, 7-water collection unit.
Detailed Description
The embodiment provides a recycling integrated magnetic catalytic oxidation wastewater treatment system, which comprises a pretreatment unit 1, a plurality of wastewater treatment units 2, a plurality of catalyst recovery units 3, a post-treatment unit 4 and a control unit 5, wherein the pretreatment unit 1 is connected with the plurality of wastewater treatment units 2 in parallel through pipelines, and each wastewater treatment unit 2 is correspondingly connected with one catalyst recovery unit 3; the control unit 5 is in communication connection with the pretreatment unit 1, the plurality of wastewater treatment units 2, the plurality of catalyst recovery units 3 and the post-treatment unit 4;
the catalyst recovery unit 3 comprises a magnetic recovery conveyor belt 301, a catalyst collection tank 6 and a water collecting tank 7, wherein the catalyst collection tank 6 is arranged on one side below the magnetic recovery conveyor belt 301, and the water collecting tank 7 is arranged on the other side below the magnetic recovery conveyor belt 301;
the post-treatment unit 4 is connected in parallel with a plurality of water collecting tanks 7 of the catalyst recovery units 3 through pipelines and is used for receiving wastewater separated from the catalyst; the next-stage wastewater treatment unit 2 is connected with a catalyst collecting tank 6 of the previous-stage catalyst recovery unit 3 for utilizing the catalyst after the use of the previous-stage wastewater treatment unit 2.
Optionally, the pretreatment unit 1 is provided with a first water inlet 101 and a plurality of first water outlets 102, and each first water outlet 102 is connected with one wastewater treatment unit 2. Preferably, the first water outlet 102 is connected to the corresponding wastewater treatment unit 2 through a pipe and a jet pump. The wastewater enters the pretreatment unit 1 through a water pump, is subjected to sand setting, oil removal and coagulation treatment in the pretreatment unit 1, and is then input into a plurality of wastewater treatment units 2 connected in parallel.
Optionally, the wastewater treatment unit 2 is cylindrical, and is provided with a water distribution area 201, a wastewater treatment area 202, a reflux area and an overflow area from bottom to top; the bottom of the water distribution area 201 is provided with a second water inlet, a carrier supporting plate 203 is arranged between the water distribution area 201 and the wastewater treatment area 202, a carrier separation net 204 is arranged between the wastewater treatment area 202 and the backflow area, an overflow weir 205 is arranged between the backflow area and the overflow area, and the outlet of the overflow weir 205 is provided with a second water outlet for outputting the feed liquid treated by the wastewater treatment unit 2.
Further optionally, a catalyst inlet 206 and an oxidant inlet 207 are respectively arranged at two sides of the water distribution area 201, a catalyst reflux outlet 208 and an oxidant reflux outlet 209 are respectively arranged at two sides of the reflux area, and an oxidant agent tank 211 is arranged between the oxidant reflux outlet 209 and the oxidant inlet 207; preferably, a catalyst agent tank 210 is disposed between the catalyst return outlet 208 and the catalyst inlet 206 of the first wastewater treatment unit 2; water pumps are respectively arranged on the pipelines upstream and downstream of the catalyst agent tank 210 and the pipelines upstream and downstream of the oxidant agent tank 211, and are used for refluxing the water body in the reflux zone to the catalyst agent tank 210 and the oxidant agent tank 211 so as to be input into the water distribution zone 201 and the wastewater treatment zone 202 again for use.
Preferably, a first filter screen is disposed on the upstream side of the oxidant return outlet 209 for preventing the catalyst particles from entering the oxidant return outlet 209 and the oxidant agent reservoir 211.
Optionally, the bottom of the water distribution area 201 includes a water distribution pipe 212, and a catalyst distribution pipe 213 and an oxidant distribution pipe 214 above the water distribution pipe 212, so that the inlet water, the catalyst and the oxidant are uniformly dispersed and uniformly mixed;
the water distribution pipeline 212 comprises a plurality of radial branch pipes 2121 and a central inlet 2122, the radial branch pipes are radial, the second water inlet is connected with the central inlet, and each radial branch pipe is uniformly provided with a plurality of water distribution nozzles 2123;
the catalyst distribution pipeline 213 is a first annular coil, an inlet of the catalyst distribution pipeline 213 is connected with the catalyst inlet 206, and a plurality of catalyst nozzles 2131 are uniformly arranged on the upper surface of the first annular coil;
the oxidant distribution pipe 214 is a second annular coil, an inlet of the oxidant distribution pipe 214 is connected to the oxidant inlet 207, and a plurality of oxidant nozzles 2141 are uniformly arranged on the upper surface of the second annular coil.
Optionally, the first annular coil and the second annular coil are at the same horizontal height, and are coiled alternately and are not communicated with each other. Since the first annular coil ejects the catalyst particles, the second annular coil ejects the oxidant solution, if the second annular coil is below, the oxidant erodes the upper first annular disk, if the first annular disk is below, the catalyst particles impact the upper second annular disk.
Optionally, the water distribution area 201 is internally filled with a first filler, the first filler is a spherical object, and the material is one or a combination of more than two of glass, polytetrafluoroethylene and stainless steel, and the first filler further promotes water inflow to be mixed with a catalyst and an oxidant.
The water body of the pretreatment unit 1 enters from the second water inlet, then enters into the central inlet of the water distribution pipeline 212, and finally uniformly enters into the water distribution area 201 through the water distribution nozzles of the radiation branch pipes; meanwhile, the catalyst of the catalyst agent tank 210 is input into the catalyst distribution pipeline 213 through the catalyst inlet 206, and is uniformly sprayed into the water distribution area 201 from the catalyst nozzles of the first annular coil; simultaneously, the oxidant in the oxidant medicament pond 211 is input into the oxidant distribution pipe 214 through the oxidant inlet 207, and is uniformly sprayed into the water distribution area 201 from the oxidant nozzles of the first annular coil. The wastewater, catalyst and oxidant flow through the gaps of the first packing to form turbulent flow with high flow velocity, are fully and uniformly mixed, and then enter the wastewater treatment area 202 through the carrier support plate 203.
Optionally, the oxidant is selected from one or more than two of hydrogen peroxide, potassium peroxymonosulfate, potassium peroxydisulfate, sodium peroxymonosulfate, sodium peroxydisulfate, ammonium peroxymonosulfate and ammonium peroxydisulfate, and the catalyst is selected from ferroferric oxide or various derivative compounds thereof.
Optionally, a second filler is disposed in the wastewater treatment area 202, where the second filler is one or more selected from iron sand, quartz sand, polytetrafluoroethylene particles, and ceramsite.
The carrier support plate 203 is used for separating the first filler and the second filler, and the pore diameter of the carrier support plate 203 is smaller than the particle diameters of the first filler and the second filler; the carrier spacer 204 has a smaller pore size than the second filler, preventing the second filler from escaping. The carrier pallet 203 and the carrier spacer 204 are made of stainless steel or polytetrafluoroethylene.
The wastewater passes through the second filler in the wastewater treatment area 202, the second filler forms a fluidized state, the wastewater is further mixed, the wastewater, the catalyst and the oxidant are fully contacted, a large amount of free radicals are generated to oxidize and degrade pollutants, the purified wastewater passes through the carrier separation net 204, and the second filler is intercepted in the wastewater treatment area 202. The wastewater enters a reflux zone, part of the treated wastewater flows back to a catalyst medicament tank 210 and an oxidant medicament tank 211 through a catalyst reflux outlet 208 and an oxidant reflux outlet 209, is used for forming a suspension of a catalyst and an oxidant solution, and enters the wastewater treatment unit 2 again, and new medicaments are continuously added into the catalyst medicament tank 210 and the oxidant medicament tank 211. Most of the treated wastewater overflows from the overflow weir 205 to enter the overflow area and flows to the corresponding catalyst recovery unit 3 through the second water outlet.
Optionally, the catalyst recovery unit 3 includes a triangular magnetic recovery conveyor 301, a water outlet nozzle 302 above the triangular magnetic recovery conveyor, and a catalyst collecting tank 6 and a water collecting tank 7 below the triangular magnetic recovery conveyor, wherein the water outlet nozzle 302 is connected with a second water outlet of the corresponding wastewater treatment unit 2;
the magnetic force recycling conveyor 301 is supported by three points of a top rotating shaft, a short side rotating shaft and a long side rotating shaft to form a triangle with a long side 303, a short side 304 and a horizontal bottom 305, the water outlet nozzle 302 is positioned above the long side 303, and a magnetic force device is arranged on the lower surface of the long side 303; the catalyst collecting tank 6 is arranged at one end below the horizontal bottom edge 305 and close to the short-side rotating shaft, and the water collecting tank 7 is arranged at one end below the horizontal bottom edge 305 and close to the long-side rotating shaft.
The water outlet nozzle 302 is conical, and a plurality of small holes are distributed at the bottom, so that water flows are dispersed and sprayed out.
Optionally, the magnetic device is a plurality of closely arranged permanent magnet rollers, and the permanent magnet rollers are closely attached to the lower surface of the long side 303 and are used for attracting the magnetic catalyst in the wastewater on the long side 303 conveyor belt.
The treated wastewater containing the magnetic catalyst is sprinkled on the long side 303 of the magnetic recovery conveyor 301 via the water outlet nozzle 302, and the separation of the catalyst and the treated water is performed under the action of gravity. The vertex rotating shaft, the short side rotating shaft and the long side rotating shaft are correspondingly connected with the vertex motor, the short side motor and the long side motor respectively, the magnetic force recovery conveyor belt 301 rotates anticlockwise under the driving of the three motors and the rotating shafts, namely, the long side 303 attracts a catalyst to climb upwards through a permanent magnet roller, the catalyst loses magnetic force attraction after reaching the vertex rotating shaft, and the catalyst falls into the catalyst collecting tank 6 below from the short side 304 to recover the magnetic catalyst. While the treated wastewater from the long side 303 flows under gravity into the sump 7. The short side 304 is at an angle of 70-90 deg. to the horizontal bottom edge 305.
Optionally, the magnetic device is a magnetic conveyer belt, the magnetic conveyer belt uses a vertex rotating shaft and a long side rotating shaft as supports, and is driven by the vertex motor and the long side motor to rotate, the upper surface of the magnetic conveyer belt is clung to the lower surface of the long side 303 of the magnetic recovery conveyer belt 301 to move, so that the catalyst is attracted to climb upwards, and after reaching the vertex rotating shaft, the magnetic conveyer belt is separated from the short side 304 to lose magnetic attraction, and the catalyst falls into the catalyst collecting tank 6 below from the short side 304 to be recovered.
Further alternatively, a rolling brush 306 is provided at the position of the horizontal bottom edge 305 near the short edge rotating shaft, the rolling brush 306 contacts with the lower surface of the horizontal bottom edge 305, and when the rolling brush 306 rotates, the rolling brush rubs against the horizontal bottom edge 305, so that the catalyst adhered to the lower surface of the horizontal bottom edge 305 is brushed down and falls into the catalyst collecting tank 6.
Optionally, baffles are disposed on two sides of the long side 303 to prevent water from leaking down the side.
Optionally, a stirring device is arranged in the catalyst collecting tank 6, the bottom outlet is connected with the catalyst agent tank 210 of the next wastewater treatment unit 2 through a pipeline, and the catalyst reflux outlet 208 of the next wastewater treatment unit 2 is connected with the catalyst collecting tank 6 through a pipeline, so that reflux wastewater of the next wastewater treatment unit 2 is introduced into the catalyst collecting tank 6, and under the action of the stirring device, a suspension is formed with the collected catalyst and is input into the next wastewater treatment unit 2 for continuous use.
Preferably, a second filter screen is arranged at the upstream of the catalyst reflux outlet 208 of the other subsequent connected wastewater treatment units 2 except the first wastewater treatment unit 2, and the catalyst reflux outlet 208 is connected in parallel with the catalyst collecting tank 6 and the water collecting tank 7 of the previous catalyst recovery unit 3 through pipelines;
the second filter screen is used for preventing the catalyst of the wastewater treatment unit 2 from entering the catalyst collecting tank 6 of the last catalyst recovery unit 3, so that the wastewater treatment unit 2 only uses the catalyst recovered by the last catalyst recovery unit 3; the catalyst return outlet 208 is connected to the sump 7 for backwashing the second filter screen by water introduced into the sump 7 when the second filter screen is blocked and cleaning is required.
Alternatively, the bottom outlet of the catalyst collection tank 6 may be connected to a catalyst post-treatment device via a pipe, so that the catalyst that is not available for multiple uses may be treated, for example, the last catalyst collection tank 6 may be designed as described above.
Optionally, an online water quality monitor is arranged in the water collecting tank 7 and is in communication connection with the control unit 5, so as to monitor the wastewater treatment effect in real time.
Preferably, the method comprises the steps of,the top of the water collecting tank 7 is provided with a third filter screen and a bottom rotating shaft movably connected with the third filter screen; the side surface of the catalyst collecting tank 6 and the water collecting tank 7 is provided with a heating device, for example, the catalyst collecting tank 6, the water collecting tank 7 and the heating device are enclosed into a triangle, and the heating device is respectively connected with the water collecting tank 7 and the catalyst collecting tank 6 through a first conveyor belt and a second conveyor belt; the third filter screen can rotate at the top of the water collecting tank 7 and above the first conveyor belt by taking the bottom rotating shaft as a fulcrum, namely the third filter screen can cover the top of the water collecting tank 7 and is used for intercepting and recycling iron-containing oxide solids, the third filter screen rotates, the intercepted solids are overturned and poured onto the first conveyor belt, and then the intercepted solids are input into a heating device for heating, so that FeO is converted into Fe 3 O 4 The regenerated catalyst is then transported by the second conveyor belt to a catalyst collection tank 6 for the next wastewater treatment unit 2.
Preferably, the heating device is connected with an oxygen supply device and can control the supply amount of oxygen. The first conveyor belt sends the intercepted solids to the heating device, the solids are placed into a heating cup of the heating device through manual operation, after heating is completed and cooling is carried out, the regenerated catalyst is manually moved to the second conveyor belt, and the process can be completed by using the mechanical arm.
Alternatively, the wastewater treatment system may be provided with only one heating device, and connected to the corresponding water collecting tank 7 by a plurality of first conveyor belts, and connected to the corresponding catalyst collecting tank 6 by a plurality of second conveyor belts, so as to intensively regenerate the solids intercepted by the third filter screen of each catalyst recovery unit 3.
Optionally, the post-treatment unit 4 is provided with a plurality of third water inlets 401 and a third water outlet 402, each third water inlet 401 is connected with the corresponding water collecting tank 7 of the catalyst recovery unit 3 through a pipeline and a water pump, and the wastewater is discharged into the post-treatment unit 4 to be post-treated and then discharged from the third water outlet 402. The water treatment process of the post-treatment unit 4 is preferably a membrane treatment, such as nanofiltration, ultrafiltration, reverse osmosis process.
Optionally, the control unit 5 is a control center of the wastewater treatment system, and the control unit 5 comprises a control computer and an alarm, wherein the control computer is in communication connection with each water pump of each wastewater treatment unit 2, so as to control water inflow, water outflow, catalyst reflux and oxidant reflux of the wastewater treatment units 2; the control computer is connected with each motor, the rolling brush 306, the stirring device and the water quality on-line monitor of each catalyst recovery unit 3 in a communication way, so that the rotation of the magnetic recovery conveyor belt 301, the operation of the catalyst collection tank 6 and the water quality of the water collecting tank 7 are controlled; the control computer is connected with each water pump of the post-processing unit 4 in a communication way, so as to control water inlet and water outlet of the post-processing unit 4;
the alarm gives an alarm under the conditions that the wastewater treatment system fails, the operation is abnormal or the wastewater treatment is not up to standard, and the attention of operation and maintenance personnel is brought.
The control unit 5 can adjust the flow of each water pump according to the wastewater treatment effect, so as to realize the automatic control of wastewater treatment.
The water pump according to the invention is preferably a jet pump.
The whole operation process is controlled by the control unit 5, the control computer analyzes and calculates the data of each water pump and the on-line monitoring instrument, and automatically issues instructions to each water pump, the catalyst agent tank 210 and the oxidant agent tank 211, and adjusts the water flow and the adding amount, so that the effective automatic operation of the whole system is realized. The display screen of the control computer can display the real-time running condition of the whole system for viewing.
Claims (7)
1. The recycling integrated magnetic catalytic oxidation wastewater treatment system is characterized by comprising a pretreatment unit, a plurality of wastewater treatment units, a plurality of catalyst recovery units, a post-treatment unit and a control unit, wherein the pretreatment unit is connected with the plurality of wastewater treatment units in parallel through pipelines, and each wastewater treatment unit is correspondingly connected with one catalyst recovery unit; the control unit is in communication connection with the pretreatment unit, the wastewater treatment units, the catalyst recovery units and the post-treatment unit;
the catalyst recovery unit comprises a magnetic recovery conveyor belt, a catalyst collection tank and a water collecting tank, wherein the catalyst collection tank is arranged on one side below the magnetic recovery conveyor belt, and the water collecting tank is arranged on the other side below the magnetic recovery conveyor belt;
the post-treatment unit is connected in parallel with a plurality of water collecting tanks of the catalyst recovery units through pipelines and is used for receiving wastewater separated from the catalyst; the next-stage wastewater treatment unit is connected with the catalyst collecting tank of the previous-stage catalyst recovery unit and is used for utilizing the catalyst used by the previous-stage wastewater treatment unit;
the wastewater treatment unit is provided with a water distribution area, a wastewater treatment area, a reflux area and an overflow area from bottom to top;
the two sides of the water distribution area are respectively provided with a catalyst inlet and an oxidant inlet, the two sides of the reflux area are respectively provided with a catalyst reflux outlet and an oxidant reflux outlet, and an oxidant medicament pond is arranged between the oxidant reflux outlet and the oxidant inlet;
a catalyst agent pool is arranged between a catalyst reflux outlet and a catalyst inlet of the first wastewater treatment unit;
the bottom of the water distribution area comprises a water distribution pipeline, and a catalyst distribution pipeline and an oxidant distribution pipeline above the water distribution pipeline, so that the water inlet, the catalyst and the oxidant are uniformly dispersed and uniformly mixed;
the catalyst distribution pipeline is a first annular coil pipe, an inlet of the catalyst distribution pipeline is connected with a catalyst inlet, and a plurality of catalyst nozzles are uniformly arranged on the upper surface of the first annular coil pipe;
the oxidant distribution pipeline is a second annular coil pipe, an inlet of the oxidant distribution pipeline is connected with an oxidant inlet, and a plurality of oxidant nozzles are uniformly arranged on the upper surface of the second annular coil pipe;
the first annular coil pipe and the second annular coil pipe are positioned at the same horizontal height, are alternately coiled and are not communicated with each other;
the catalyst collecting tank is internally provided with a stirring device, the bottom outlet is connected with the catalyst agent tank of the next wastewater treatment unit through a pipeline, and the catalyst reflux outlet of the next wastewater treatment unit is connected with the catalyst collecting tank through a pipeline and is used for introducing reflux wastewater of the next wastewater treatment unit into the catalyst collecting tank;
the upstream of the catalyst reflux outlet of other subsequent connected wastewater treatment units except the first wastewater treatment unit is provided with a second filter screen, and the catalyst reflux outlet is connected with a catalyst collecting tank and a water collecting tank of a catalyst recovery unit in parallel through a pipeline;
the second filter screen is used for preventing the catalyst of the wastewater treatment unit from entering the catalyst collecting tank of the last catalyst recovery unit, so that the wastewater treatment unit only uses the catalyst recovered by the last catalyst recovery unit; the catalyst reflux outlet is connected with the water collecting tank, and is used for backwashing the second filter screen by introducing water of the water collecting tank when the second filter screen is blocked and needs to be cleaned;
the top of the water collecting tank is provided with a third filter screen and a bottom rotating shaft which is movably connected with the third filter screen; the side surface of the catalyst collecting tank and the water collecting tank is provided with a heating device which is connected with the water collecting tank and the catalyst collecting tank through a first conveyor belt and a second conveyor belt respectively; the third filter screen can rotate on the top of the water collecting tank and above the first conveyor belt by taking the bottom rotating shaft as a fulcrum;
the third filter screen can cover the top of the water collecting tank and is used for intercepting and recycling iron-containing oxide solids, the third filter screen rotates to overturn and pour the intercepted solids onto the first conveyor belt, and the intercepted solids are input into the heating device for heating to convert FeO into Fe 3 O 4 And then the regenerated catalyst is conveyed to a catalyst collecting tank through a second conveyor belt for the next wastewater treatment unit.
2. The wastewater treatment system according to claim 1, wherein the wastewater treatment unit is cylindrical, a second water inlet is formed in the bottom of the water distribution area, a carrier supporting plate is arranged between the water distribution area and the wastewater treatment area, a carrier separation net is arranged between the wastewater treatment area and the backflow area, an overflow weir is arranged between the backflow area and the overflow area, and a second water outlet is formed in an outlet of the overflow weir and is used for outputting the feed liquid treated by the wastewater treatment unit.
3. The wastewater treatment system according to claim 2, wherein the water distribution pipeline comprises a plurality of radial branch pipes and a central inlet, the radial branch pipes are radial, the second water inlet is connected with the central inlet, and each radial branch pipe is uniformly provided with a plurality of water distribution nozzles.
4. The wastewater treatment system of claim 1, wherein the catalyst recovery unit comprises a triangular magnetic recovery conveyor belt, a water outlet nozzle above the triangular magnetic recovery conveyor belt, and a catalyst collection tank and a water collecting tank below the triangular magnetic recovery conveyor belt, wherein the water outlet nozzle is connected with a second water outlet of the corresponding wastewater treatment unit;
the magnetic force recycling conveyor belt is supported by three points of a vertex rotating shaft, a short side rotating shaft and a long side rotating shaft to form a triangle with a long side, a short side and a horizontal bottom side, the water outlet nozzle is positioned above the long side, and a magnetic force device is arranged on the lower surface of the long side; the catalyst collecting tank is arranged below the horizontal bottom edge and near one end of the short-side rotating shaft, and the water collecting tank is arranged below the horizontal bottom edge and near one end of the long-side rotating shaft.
5. The wastewater treatment system of claim 4, wherein the horizontal bottom edge is provided with a roller brush adjacent to the short side rotating shaft, and the roller brush is in contact with the lower surface of the horizontal bottom edge.
6. The wastewater treatment system of claim 1, wherein the post-treatment unit is provided with a plurality of third water inlets and a third water outlet, each third water inlet being connected to the corresponding water collection sump of the catalyst recovery unit by a pipe and a water pump.
7. The wastewater treatment system according to claim 4, wherein the magnetic device is a magnetic conveyor belt, the magnetic conveyor belt is supported by a top rotating shaft and a long side rotating shaft and is driven by a top motor and a long side motor to rotate, the upper surface of the magnetic conveyor belt is closely attached to the lower surface of the long side of the magnetic recovery conveyor belt and is used for attracting the catalyst to climb upwards, and after reaching the top rotating shaft, the magnetic conveyor belt is separated from the short side and loses magnetic attraction, and the catalyst falls into a catalyst collecting tank below from the short side for recovery.
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