CN110921747A - Hierarchical air supporting effluent disposal system - Google Patents
Hierarchical air supporting effluent disposal system Download PDFInfo
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- CN110921747A CN110921747A CN201910943779.3A CN201910943779A CN110921747A CN 110921747 A CN110921747 A CN 110921747A CN 201910943779 A CN201910943779 A CN 201910943779A CN 110921747 A CN110921747 A CN 110921747A
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- 239000007788 liquid Substances 0.000 claims abstract description 139
- 238000005188 flotation Methods 0.000 claims abstract description 120
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 23
- 238000007667 floating Methods 0.000 claims abstract description 20
- 239000002351 wastewater Substances 0.000 claims description 36
- 230000001105 regulatory effect Effects 0.000 claims description 30
- 239000000701 coagulant Substances 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 10
- 238000001556 precipitation Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 239000002105 nanoparticle Substances 0.000 claims 1
- 239000003921 oil Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 15
- 239000002893 slag Substances 0.000 description 13
- 239000008394 flocculating agent Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000002245 particle Substances 0.000 description 10
- 238000005345 coagulation Methods 0.000 description 8
- 230000015271 coagulation Effects 0.000 description 8
- 238000007599 discharging Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 7
- 238000005086 pumping Methods 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/365—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds from petrochemical industry (e.g. refineries)
-
- 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
- C02F2303/16—Regeneration of sorbents, filters
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physical Water Treatments (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a graded air-flotation wastewater treatment system, which comprises a primary air-flotation treatment unit and at least one secondary air-flotation treatment unit; the primary air floatation treatment unit comprises: the device comprises a primary air flotation chamber, a primary circulating dissolved air pipeline system and a primary liquid inlet pipeline, wherein the primary circulating dissolved air pipeline system is connected with a feed inlet of the primary air flotation chamber; the secondary air-flotation processing unit comprises: the secondary air-float chamber, a secondary circulating dissolved air pipeline system connected with a feed inlet of the secondary air-float chamber and a secondary liquid inlet pipeline, wherein the secondary dissolved air pump is externally connected with an air supply source and is connected with the secondary liquid inlet pipeline, and the secondary liquid inlet pipeline is connected with a primary clear liquid outlet; when the number of the secondary air-floating treatment units is two or more, the secondary air-floating treatment units are connected with the secondary liquid inlet pipeline of the next secondary air-floating treatment unit through the secondary clear liquid outlet of the last secondary air-floating treatment unit. The system is compact and efficient, can be integrated into a plurality of single skid-mounted devices, and is convenient to transport and install.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a graded air floatation wastewater treatment system.
Background
In petrochemical industry and oil field exploitation, a large amount of petroleum oil substances and granular suspended matters are often generated, the oily wastewater has the characteristics of complex components, toxicity of petroleum components, addition of various degradation-resistant chemical agents and high-temperature and high-salinity, and the produced water is difficult to reach the discharge standard, particularly COD (chemical oxygen demand) and petroleum indexes by singly using a conventional treatment process. The adoption of air flotation separation can effectively realize the treatment of oily wastewater. However, oil field mining projects are often built in remote places and are scattered and not concentrated, and the conventional air flotation separation and flocculation sedimentation process is long in route, large and complex in equipment and construction, and cannot be skid-mounted into a small container unit, so that flexible transportation and field efficient assembly cannot be realized.
The differences of wastewater treatment capacity, wastewater components and the like of different projects are large, the treatment process is not flexible enough, and the application range is narrow. The overall process has the problems of large power consumption, complex equipment, huge equipment, low efficiency, poor effect and the like.
The existing flocculation precipitation process is carried out by independent equipment which mainly comprises a dosing system and a stirring system, the equipment is still relatively complex and large, and miniaturized skid-mounted equipment is not easy to manufacture due to the process characteristics.
Disclosure of Invention
The invention mainly aims to provide a graded air-flotation wastewater treatment system to solve the technical problem that air-flotation separation equipment in the prior art is inflexible in transportation and installation.
In order to achieve the above object, the present invention provides a staged air-flotation wastewater treatment system, comprising a primary air-flotation treatment unit and at least one secondary air-flotation treatment unit;
the primary air floatation treatment unit comprises: the device comprises a primary air flotation chamber, a primary circulating dissolved air pipeline system and a primary liquid inlet pipeline, wherein the primary circulating dissolved air pipeline system is connected with a feed inlet of the primary air flotation chamber and comprises a primary dissolved air pump, a primary dissolved air tank connected with the primary dissolved air pump, a primary liquid inlet regulating valve connected and arranged in front of the primary dissolved air pump, and a primary dissolved air tank outlet regulating valve arranged behind the primary dissolved air tank and communicated with the feed inlet of the air flotation chamber, and the primary dissolved air pump is externally connected with an air supply source and is connected with the primary liquid inlet pipeline;
the secondary air-flotation processing unit comprises: the secondary circulating dissolved air pipeline system comprises a secondary dissolved air pump, a secondary dissolved air tank connected with the secondary dissolved air pump, a secondary liquid inlet regulating valve arranged in front of the secondary dissolved air pump in a connecting manner, a flocculant supply system and a coagulant aid supply system which are arranged in front of the secondary liquid inlet regulating valve in a connecting manner, and a secondary liquid discharge valve arranged behind the secondary dissolved air tank and communicated with the feeding port of the secondary dissolved air chamber, wherein the secondary dissolved air pump is externally connected with an air supply source and is connected with the secondary liquid inlet pipeline, and the secondary liquid discharge pipeline is connected with a primary clear liquid outlet;
when the number of the secondary air-floating treatment units is two or more, the secondary air-floating treatment units are connected with the secondary liquid inlet pipeline of the next secondary air-floating treatment unit through the secondary clear liquid outlet of the last secondary air-floating treatment unit.
The graded air-flotation wastewater treatment system is compact and efficient in equipment, each air-flotation treatment unit can be integrated into a plurality of single skid-mounted equipment, the transportation and the installation are convenient, the treatment process is simplified, the air-flotation treatment units can be increased or decreased according to the actual treatment condition, and the application occasion is more flexible.
And introducing suspended particles which are not removed by air and sediment in the primary air flotation chamber into the secondary air flotation chamber for further removing the suspended particles through the processes of flocculation, coagulation aiding, air dissolving, air flotation, sediment and the like. The number of the secondary air floatation treatment units is increased or decreased according to actual conditions.
Furthermore, the primary air flotation chamber and the secondary air flotation chamber respectively comprise an air flotation chamber cavity, a scum capturing machine arranged at the top of the air flotation chamber cavity, a pressure releaser arranged in the air flotation chamber cavity and communicated with a feed inlet of the air flotation chamber, a sedimentation inclined pipe arranged in the middle area of the air flotation chamber cavity, and a slag discharging structure arranged at the bottom of the air flotation chamber cavity.
Further, the slag discharging structure is a slag discharging ball valve.
Further, the air flotation chamber cavity is a cavity with a conical body at the lower part.
Furthermore, the flocculant supply system and the coagulant aid supply system both comprise a suction device for sucking the flocculant or the coagulant aid and a mixing device which is connected with the suction device and is used for mixing the flocculant or the coagulant aid with the wastewater. Therefore, the whole system has the advantages of less medicament addition amount, low operation power, reduced operation treatment cost, integration of multiple processes of air flotation, coagulation dosing, coagulation stirring, coagulation reaction and the like, high treatment efficiency, capability of realizing separation of oil, water and solid, strong load impact resistance of the system and wide working condition application range.
Further, the suction device is an ejector. The suction device adopts a venturi tube spraying structure design, and the flocculating agent and the coagulant aid are sucked into the pipeline through the sprayer to be mixed with the wastewater under the condition of not needing external pressure.
Further, the mixing device is a pipeline mixer. The back end of the suction device is provided with a pipeline mixer to further mix the additive agent with the waste water.
Through the integrated use of the two systems, the traditional medicament adding pump, a stirring tank, a stirrer and the like are replaced.
Furthermore, the primary liquid inlet pipe comprises a wastewater liquid inlet pipe for wastewater to enter and a primary dissolved air circulation liquid inlet pipe, and the primary dissolved air circulation liquid inlet pipe is arranged on the wastewater liquid inlet pipe in a bypass mode and is connected with a dissolved air circulation liquid outlet of the primary air flotation chamber.
Furthermore, the secondary liquid inlet pipe comprises a clear liquid inlet pipe for clear liquid to enter and a secondary dissolved air circulating liquid inlet tank, and the secondary dissolved air circulating liquid inlet pipe is arranged on the clear liquid inlet pipe in a bypass mode and is connected with a dissolved air circulating liquid outlet of the secondary air floating chamber.
Furthermore, the pressure releaser is used for controlling the precipitation of the 100nm-10um nanometer-scale microbubbles.
Therefore, the graded air-flotation wastewater treatment system is compact and efficient in equipment, each air-flotation treatment unit can be integrated into a plurality of single skid-mounted equipment, the transportation and the installation are convenient, the treatment process is simplified, and the process equipment is reduced.
The whole system has high load impact resistance to the wastewater treatment capacity, the content of oil materials and the content of suspended particles, the oil materials and the suspended particles can be recycled in a classified mode, the removal rate is high, and the treatment difficulty of subsequent slurry is reduced.
The invention is further described with reference to the following figures and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the invention, and are included to explain the invention and their equivalents and not limit it unduly. In the drawings:
FIG. 1 is a schematic view of a staged air flotation wastewater treatment system according to the present invention.
1: a first air flotation processing unit;
11: a first wastewater inlet pipe;
12: a first dissolved gas circulating liquid inlet pipe:
13: a first liquid inlet regulating valve;
14: a first dissolved air pump:
15: a first dissolved air tank:
16: an outlet regulating valve of the first dissolved air tank;
17: a first slag discharge ball valve;
181: a first pressure releaser:
182: a first dross catcher;
183: a first settling down pipe chute;
19: an oil outlet:
2: a second air floatation treatment unit;
21: a first clear liquid inlet pipe;
22: a second dissolved gas circulating liquid inlet pipe:
231: a first flocculant injector;
232: a first line mixer:
233: a first coagulant aid injector;
234: a second line mixer;
24: a second liquid inlet regulating valve;
25: a second dissolved air pump:
26: the second dissolved air tank:
27: an outlet regulating valve of the second dissolved air tank;
28: a second slag discharge ball valve;
291: a second pressure releaser:
292: a second dross catcher;
293: a first suspended waste residue discharge port;
294: a second settling inclined tube;
3: a third air floatation treatment unit;
31: a third clear liquid inlet pipe;
32: a third dissolved gas circulating liquid inlet pipe:
331: a second flocculant sprayer;
332: a third line mixer:
333: a second coagulant aid injector;
334: a fourth line mixer;
34: a third liquid inlet regulating valve;
35: a third dissolved air pump:
36: a third dissolved air tank:
37: an outlet regulating valve of a third dissolved air tank;
38: a third slag discharge ball valve;
391: a third pressure releaser:
392: a third dross catcher;
393: a second suspended waste residue discharge port;
394: and a third settling inclined tube.
Detailed Description
The invention will be described more fully hereinafter with reference to the accompanying drawings. Those skilled in the art will be able to implement the invention based on these teachings. Before the present invention is described in detail with reference to the accompanying drawings, it is to be noted that:
the technical solutions and features provided in the present invention in the respective sections including the following description may be combined with each other without conflict.
Moreover, the embodiments of the present invention described in the following description are generally only examples of a part of the present invention, and not all examples. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
With respect to terms and units in the present invention. The terms "comprising," "having," and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.
The invention discloses a graded air-flotation wastewater treatment system, which comprises a primary air-flotation treatment unit and at least one secondary air-flotation treatment unit;
the primary air floatation treatment unit comprises: the device comprises a primary air flotation chamber, a primary circulating dissolved air pipeline system and a primary liquid inlet pipeline, wherein the primary circulating dissolved air pipeline system is connected with a feed inlet of the primary air flotation chamber and comprises a primary dissolved air pump, a primary dissolved air tank connected with the primary dissolved air pump, a primary liquid inlet regulating valve connected and arranged in front of the primary dissolved air pump, and a primary dissolved air tank outlet regulating valve arranged behind the primary dissolved air tank and communicated with the feed inlet of the air flotation chamber, and the primary dissolved air pump is externally connected with an air supply source and is connected with the primary liquid inlet pipeline;
the secondary air-flotation processing unit comprises: the secondary circulating dissolved air pipeline system comprises a secondary dissolved air pump, a secondary dissolved air tank connected with the secondary dissolved air pump, a secondary liquid inlet regulating valve arranged in front of the secondary dissolved air pump in a connecting manner, a flocculant supply system and a coagulant aid supply system which are arranged in front of the secondary liquid inlet regulating valve in a connecting manner, and a secondary liquid discharge valve arranged behind the secondary dissolved air tank and communicated with the feeding port of the secondary dissolved air chamber, wherein the secondary dissolved air pump is externally connected with an air supply source and is connected with the secondary liquid inlet pipeline, and the secondary liquid discharge pipeline is connected with a primary clear liquid outlet;
when the number of the secondary air-floating treatment units is two or more, the secondary air-floating treatment units are connected with the secondary liquid inlet pipeline of the next secondary air-floating treatment unit through the secondary clear liquid outlet of the last secondary air-floating treatment unit.
The primary air flotation chamber and the secondary air flotation chamber respectively comprise an air flotation chamber cavity, a scum capturing machine arranged at the top of the air flotation chamber cavity, a pressure releaser arranged in the air flotation chamber cavity and communicated with a feed inlet of the air flotation chamber, a sedimentation inclined pipe arranged in the middle area of the air flotation chamber cavity, and a slag discharging structure arranged at the bottom of the air flotation chamber cavity.
The slag discharging structure is a slag discharging ball valve.
The air flotation chamber cavity is a cavity with a conical body at the lower part.
The flocculant supply system and the coagulant aid supply system both comprise a suction device for sucking the flocculant or the coagulant aid and a mixing device which is connected with the suction device and is used for mixing the flocculant or the coagulant aid with the wastewater.
The suction device is an ejector.
The mixing device is a pipeline mixer.
The primary liquid inlet pipe comprises a wastewater liquid inlet pipe for wastewater to enter and a primary dissolved air circulating liquid inlet pipe, and the primary dissolved air circulating liquid inlet pipe is arranged on the wastewater liquid inlet pipe in a bypass mode and is connected with a dissolved air circulating liquid outlet of the primary air flotation chamber.
The secondary liquid inlet pipe comprises a clear liquid inlet pipe for clear liquid to enter and a secondary dissolved air circulating liquid inlet tank, and the secondary dissolved air circulating liquid inlet pipe is arranged on the clear liquid inlet pipe in a bypass mode and is connected with a dissolved air circulating liquid outlet of the secondary air floating chamber.
The pressure releaser is used for controlling the precipitation of 100nm-10um nanometer microbubbles.
As shown in fig. 1, the graded air-flotation wastewater treatment system and the oily wastewater treatment system of the present invention have the number of air-flotation treatment units increased or decreased according to practical application conditions, and in the embodiment of the present invention, the number of air-flotation treatment units is determined by the condition of three air-flotation treatment units, including a primary air-flotation treatment unit, i.e., a first air-flotation treatment unit 1, and two secondary air-flotation treatment units, i.e., a second air-flotation treatment unit 2 and a third air-flotation treatment unit 3, which are connected in sequence.
The main treatment bodies of the three air-flotation treatment units are air-flotation chambers, the three air-flotation chambers are chambers with conical bottoms, and are provided with dissolved air circulation liquid inlets and outlets, liquid/slag discharge ports and pressure release devices, the middle parts of the chambers are provided with sedimentation inclined tubes, the middle upper parts of the chambers are provided with clear liquid outlets, and the tops of the chambers are provided with scum capturing machines.
First air flotation processing unit 1: the device comprises a first air flotation chamber, and further comprises a first wastewater inlet pipe 11 and a first dissolved air circulating liquid inlet pipe 12 which is connected with the first wastewater inlet pipe 11 in a bypass manner, wherein the first dissolved air circulating liquid inlet pipe 12 is connected with a first dissolved air circulating liquid outlet of the first air flotation chamber;
the device also comprises a first liquid inlet regulating valve 13, a first dissolved air pump 14, a first dissolved air tank 15 and a first dissolved air tank outlet regulating valve 16 which are sequentially connected after being converged with the first wastewater liquid inlet pipe 11 and a first dissolved air circulation liquid inlet pipe 12 which is connected beside the first wastewater liquid inlet pipe 11, wherein the first dissolved air pump 14 is provided with a liquid inlet for connecting the first liquid inlet regulating valve 13 and an air inlet for connecting an external air source;
the bottom of the first air flotation chamber is provided with a first slag ball discharging valve 17, a first pressure releaser 181 is arranged inside the first air flotation chamber, and the first pressure releaser 181 is connected with an outlet regulating valve 16 of a first dissolved air tank. The top of the first air flotation chamber is provided with a first scum capturer 182 and an oil outlet 19 for outputting recovered oil.
Mixing the wastewater with dissolved air circulating liquid generated by the first air flotation chamber, then pumping the mixed wastewater into the first dissolved air pump 14 through the liquid inlet, and simultaneously pumping air into the first dissolved air pump 14 through the air inlet;
the first dissolved air pump 14 controls the vacuum degree in the first dissolved air pump 14 through a first dissolved air circulating liquid inlet pipe 12 arranged in front of the pump to control the air suction amount and the water flow rate of the first dissolved air pump 14, and in practical application, the gas-liquid ratio and the dissolved air pressure in the wastewater can be accurately adjusted through the mode and the first dissolved air tank outlet adjusting valve 16, so that the whole system can achieve optimal parameter operation.
The waste water after gas dissolving enters the first air flotation chamber through a first pressure releaser 181 at the bottom of the first air flotation chamber, the pressure releaser with a special structure design enables the pressure of the waste water to suddenly drop, a large amount of nano-scale micro-bubbles of 100nm-10um are separated out, bubbles are adhered to oil substances in the waste water in the separation, diffusion and rising processes, then the middle cavity of the whole first air flotation chamber is filled up and passes through a first sedimentation inclined pipe 183, the liquid is brought to the liquid level, the bubbles are brought into an oil outlet 19 for collection and discharge after being captured by a first scum capture machine 182, the water content and suspended matters of the part of floating oil are low, the oil substances can be completely recovered after other external separation and filtration processes, and sludge at the bottom of the first air flotation chamber is discharged through a first residue discharge ball valve 17 arranged at the bottom of the first air flotation chamber.
The second air floatation treatment unit 2: the device comprises a second air flotation chamber, a second clear liquid inlet pipe 21 connected with a clear liquid outlet of the first air flotation chamber, and a second dissolved air circulating liquid inlet pipe 22 connected with the second clear liquid inlet pipe 21 in a bypass mode, wherein the second dissolved air circulating liquid inlet pipe 22 is connected with a second dissolved air circulating liquid outlet of the second air flotation chamber;
the device also comprises a first flocculant ejector 231, a first pipeline mixer 232, a first coagulant aid ejector 233, a second pipeline mixer 234, a second liquid inlet regulating valve 24, a second dissolved air pump 25, a second dissolved air tank 26 and a second dissolved air tank outlet regulating valve 27 which are sequentially connected after being converged with a second dissolved air circulating liquid inlet pipe 22 which is connected with the second clear liquid inlet pipe 21 and is by-pass the second clear liquid inlet pipe 21; wherein, the second air dissolving pump 25 is provided with a liquid inlet for connecting the second liquid inlet regulating valve 24 and an air inlet externally connected with an air source;
and a second slag discharge ball valve 28 is arranged at the bottom of the second air floatation chamber, a second pressure releaser 291 is arranged in the second air floatation chamber, and the second pressure releaser 291 is connected with an outlet regulating valve 27 of a second dissolved air tank. The top of the second air flotation chamber is provided with a second scum capturer 292 and a first suspended waste residue outlet 293 for outputting the recovered oil.
After the supernatant liquid generated by the first air flotation chamber and the dissolved air circulating liquid generated by the second air flotation chamber are mixed through the second clear liquid inlet pipe 21 and the second dissolved air circulating liquid inlet pipe 22 connected by the second clear liquid inlet pipe 21, the mixture sequentially passes through the first flocculating agent ejector 231, the first pipeline mixer 232, the first coagulant aid ejector 233 and the second pipeline mixer 234, and the flocculating agent, the coagulant aid and suspended particles in the wastewater are fully mixed and reacted;
the mixed and reacted liquid enters the second air dissolving pump 25 for pumping, and meanwhile, air enters the second air dissolving pump 25 through the air inlet for pumping;
a large amount of nano-scale micro-bubbles separated out from the pressure releaser after passing through the second dissolved air pump 25 and the second dissolved air tank 26 are condensed into gas-solid floccules, the micro-scale floccules are carried into a liquid outlet surface by the floating of the fused bubbles, and are discharged out of the system after being captured by the second scum capturing machine 292, and the large floccules sink into the bottom of the cavity to be gathered to form sludge, and are discharged out of the system through a second scum ball valve 28 at the bottom.
The suction device adopts a special venturi tube injection structure design, the flocculating agent and the flocculating agent are mixed with the wastewater by a suction pipeline under the condition that external pressure is not needed through the injection system, a pipeline mixer is arranged at the rear end of the injection system to further mix the additive agent with the wastewater, and the traditional agent adding pump, a stirring tank, a stirrer and other equipment are replaced through the integrated use of the two systems. The flocculating agent and the coagulant aid are fully mixed and reacted with suspended particles in the wastewater in the circulating pipeline.
The third air floatation treatment unit 2: the device comprises a third air flotation chamber, a third clear liquid inlet pipe 31 connected with a clear liquid outlet of the second air flotation chamber, and a third dissolved air circulating liquid inlet pipe 32 connected with the third clear liquid inlet pipe 31 in a bypass manner, wherein the third dissolved air circulating liquid inlet pipe 32 is connected with a third dissolved air circulating liquid outlet of the third air flotation chamber;
the device also comprises a second flocculant sprayer 331, a third pipeline mixer 332, a second coagulant aid sprayer 333, a fourth pipeline mixer 334, a third liquid inlet regulating valve 34, a third dissolved air pump 35, a third dissolved air tank 36 and a third dissolved air tank outlet regulating valve 37 which are sequentially connected after being converged by a third dissolved air circulating liquid inlet pipe 32 which is connected with the third clear liquid inlet pipe 31 and the third clear liquid inlet pipe 31; the third air dissolving pump 35 is provided with a liquid inlet connected with the third liquid inlet regulating valve 34 and an air inlet externally connected with an air source;
and a third slag discharge ball valve 38 is arranged at the bottom of the third air floatation chamber, a third pressure releaser 391 is arranged in the third air floatation chamber, and the third pressure releaser 391 is connected with an outlet regulating valve 37 of a third dissolved air tank. The top of the third air flotation chamber is provided with a third scum capturer 392 and a second suspended waste residue discharge port 393 for outputting the recovered oil.
Supernatant liquor generated by the second air flotation chamber and dissolved air circulating liquid generated by the third air flotation chamber are mixed with a third dissolved air circulating liquid inlet pipe 32 connected beside a third clear liquid inlet pipe 31 through a third clear liquid inlet pipe 31, and then sequentially pass through a second flocculating agent ejector 331, a third pipeline mixer 332, a second coagulant aid ejector 333 and a fourth pipeline mixer 334, so that flocculating agents, coagulant aids and suspended particles in the wastewater are fully mixed and reacted;
the mixed and reacted liquid enters the third air dissolving pump 35 for pumping, and meanwhile, air enters the third air dissolving pump 35 through the air inlet for pumping;
a large amount of nano-scale micro-bubbles separated out from the pressure releaser after passing through the third dissolved air pump 35 and the third dissolved air tank 36 are condensed into gas-solid floccules, the micro-scale floccules float upwards from the fused bubbles and are brought into the liquid outlet surface, and are discharged out of the system after being captured by the third scum capturing machine 392, and the large floccules sink into the bottom of the cavity and are gathered to form sludge, and are discharged out of the system through the third scum ball valve 38 at the bottom.
Similarly, the suction device adopts a special venturi tube spraying structure design, the flocculating agent and the flocculating agent are sucked into the pipeline to be mixed with the wastewater under the condition that external pressure is not needed through the spraying system, the pipeline mixer is arranged at the rear end of the spraying system to further mix the additive agent with the wastewater, and the traditional agent adding pump, the stirring tank, the stirrer and other equipment are replaced through the integrated use of the two systems. The flocculating agent and the coagulant aid are fully mixed and reacted with suspended particles in the wastewater in the circulating pipeline.
Principle of air flotation chamber: air is introduced into the water to generate fine bubbles, so that fine suspended matters and oil substances in the water are adhered to the air bubbles and float to the water surface along with the bubbles to form an oil layer and scum, and the aims of removing the oil substances and the suspended matters in the water and improving the water quality are fulfilled. Generally, the smaller the diameter of the bubbles is, the more the number of the bubbles is, and the better the air floatation effect is; inorganic salts in the water can accelerate the breaking and merging of bubbles and reduce the air floatation effect; the coagulant is added to promote the coagulation of suspended matters, so that the suspended matters adhere to bubbles to float upwards.
Compared with the prior art, the invention has the advantages that:
1. the system equipment is compact and efficient, can be integrated into a plurality of single skid-mounted equipment, and is convenient to transport and install.
2. The whole system has high load impact resistance to the wastewater treatment capacity, the content of oil materials and the content of suspended particles, the oil materials and the suspended particles can be recycled in a classified mode, the removal rate is high, and the treatment difficulty of subsequent slurry is reduced.
3. The treatment process is simplified, the process equipment is reduced, the addition of the medicament of the whole system is less, the operation power is low, and the operation treatment cost is reduced.
4. The air flotation, coagulation dosing, coagulation stirring, coagulation reaction and other processes are integrated, the treatment efficiency is high, the separation of oil, water and solid can be realized, the system has strong load impact resistance and wide working condition application range.
The contents of the present invention have been explained above. Those skilled in the art will be able to implement the invention based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the above description without inventive step, shall fall within the scope of protection of the present invention.
Claims (10)
1. The graded air-flotation wastewater treatment system is characterized by comprising a primary air-flotation treatment unit and at least one secondary air-flotation treatment unit;
the primary air floatation treatment unit comprises: the device comprises a primary air flotation chamber, a primary circulating dissolved air pipeline system and a primary liquid inlet pipeline, wherein the primary circulating dissolved air pipeline system is connected with a feed inlet of the primary air flotation chamber and comprises a primary dissolved air pump, a primary dissolved air tank connected with the primary dissolved air pump, a primary liquid inlet regulating valve connected and arranged in front of the primary dissolved air pump, and a primary dissolved air tank outlet regulating valve arranged behind the primary dissolved air tank and communicated with the feed inlet of the air flotation chamber, and the primary dissolved air pump is externally connected with an air supply source and is connected with the primary liquid inlet pipeline;
the secondary air-flotation processing unit comprises: the secondary circulating dissolved air pipeline system comprises a secondary dissolved air pump, a secondary dissolved air tank connected with the secondary dissolved air pump, a secondary liquid inlet regulating valve arranged in front of the secondary dissolved air pump in a connecting manner, a flocculant supply system and a coagulant aid supply system which are arranged in front of the secondary liquid inlet regulating valve in a connecting manner, and a secondary liquid discharge valve arranged behind the secondary dissolved air tank and communicated with the feeding port of the secondary dissolved air chamber, wherein the secondary dissolved air pump is externally connected with an air supply source and is connected with the secondary liquid inlet pipeline, and the secondary liquid discharge pipeline is connected with a primary clear liquid outlet;
when the number of the secondary air-floating treatment units is two or more, the secondary air-floating treatment units are connected with the secondary liquid inlet pipeline of the next secondary air-floating treatment unit through the secondary clear liquid outlet of the last secondary air-floating treatment unit.
2. The staged air-flotation wastewater treatment system as recited in claim 1, wherein each of the primary air-flotation chamber and the secondary air-flotation chamber comprises a flotation chamber cavity, a scum catcher disposed at the top of the flotation chamber cavity, a pressure releaser disposed in the flotation chamber cavity and communicated with the feed inlet of the flotation chamber, a settling chute disposed in the middle region of the flotation chamber cavity, and a residue discharge structure disposed at the bottom of the flotation chamber cavity.
3. The staged air flotation wastewater treatment system according to claim 1, wherein the deslagging structure is a deslagging ball valve.
4. The staged air flotation wastewater treatment system as claimed in claim 1, wherein the air flotation chamber cavity is a cavity with a lower portion being a cone.
5. The staged air flotation wastewater treatment system as claimed in claim 1, wherein each of the flocculant supply system and the coagulant aid supply system comprises an intake device for intake of the flocculant or the coagulant aid, and a mixing device connected to the intake device for mixing the flocculant or the coagulant aid with the wastewater.
6. The staged air flotation wastewater treatment system as claimed in claim 5, wherein the suction device is an eductor.
7. The staged air flotation wastewater treatment system as claimed in claim 5, wherein the mixing device is an in-line mixer.
8. The staged air flotation wastewater treatment system as claimed in claim 1, wherein the primary inlet pipe comprises a wastewater inlet pipe for wastewater inlet, and a primary dissolved air circulation liquid inlet pipe, and the primary dissolved air circulation liquid inlet pipe is arranged by-pass on the wastewater inlet pipe and is connected with the primary air flotation chamber dissolved air circulation liquid outlet.
9. The staged air flotation wastewater treatment system as recited in claim 1, wherein the secondary liquid inlet pipe comprises a clear liquid inlet pipe for clear liquid to enter, and a secondary air-dissolved circulation liquid inlet tank, and the secondary air-dissolved circulation liquid inlet pipe is arranged on the clear liquid inlet pipe in a bypass manner and is connected with the secondary air-dissolved circulation liquid outlet of the secondary air flotation chamber.
10. The staged air flotation wastewater treatment system as claimed in claim 1, wherein the pressure releaser is a pressure releaser for controlling the precipitation of nano-sized microbubbles of 100nm to 10 um.
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