CN110078262B - Integrated reactor for removing trace antibiotics in composite polluted surface water and removing method thereof - Google Patents
Integrated reactor for removing trace antibiotics in composite polluted surface water and removing method thereof Download PDFInfo
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- CN110078262B CN110078262B CN201910421618.8A CN201910421618A CN110078262B CN 110078262 B CN110078262 B CN 110078262B CN 201910421618 A CN201910421618 A CN 201910421618A CN 110078262 B CN110078262 B CN 110078262B
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- 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
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/40—Organic compounds containing sulfur
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses an integrated reactor for removing trace antibiotics in composite polluted surface water and a removing method thereof, wherein the reactor comprises a feed pump, a first conventional flocculation tank, a second conventional flocculation tank, a carrier flocculation mixing tank, a carrier flocculation reaction tank, an inclined plate sedimentation tank and an ultrafiltration tank which are sequentially connected; the bottoms of the first conventional flocculation tank, the second conventional flocculation tank, the carrier flocculation mixing tank, the carrier flocculation reaction tank, the inclined plate sedimentation tank and the ultrafiltration tank are all provided with sludge discharge pipes; each sludge discharge pipe is connected with the hydrocyclone through a sludge circulating pump; the hydrocyclone is positioned above the carrier flocculation mixing tank. The reactor combines conventional flocculation, carrier flocculation, inclined plate sedimentation, ultrafiltration membrane filtration and the like, realizes the removal of trace antibiotics in the composite polluted surface water through the synergistic effect among different device technologies, and simultaneously ensures the removal of conventional pollutants; the whole reactor has small floor area, low operation cost, high automation degree and convenient operation management.
Description
Technical Field
The invention belongs to environmental pollution treatment, and particularly relates to an integrated reactor for removing trace antibiotics in composite polluted surface water and a removing method thereof.
Background
In recent years, due to the abuse of antibiotics in human medical treatment and livestock and poultry breeding industries, the used antibiotics directly or indirectly enter the environment in the form of a parent or a metabolite, and pose potential threats to human health and ecological environment. The environmental residue of antibiotics accelerates the development and spread of bacterial drug resistance, and has become a global environmental health problem.
In essence, microfiltration and ultrafiltration techniques do not belong to advanced treatment techniques for complex contaminated surface water; although nanofiltration or reverse osmosis can greatly improve the removal capacity of organic matters, the method has the problems of high operation cost, complex operation management, low water yield and the like, so the method is rarely used; and since antibiotics are typically present in natural surface waters in trace concentrations (ng/L-mug/L), their removal is very difficult with conventional water treatment processes. Therefore, the development of a composite polluted surface water treatment technology with low investment and operation cost and simple operation management is urgently needed; many researchers have proposed a short-flow treatment process with ultrafiltration as a core, that is, coagulation and ultrafiltration are combined, and the adsorption and rolling sweeping of coagulation are utilized to convert soluble organic matters into granular organic matters, so that the removal capacity of the ultrafiltration process on soluble macromolecular organic matters can be effectively improved. The turbidity of the effluent treated by the method is below 0.1 NTU. However, this method has a limited ability to remove trace amounts of organic substances having small molecular weights.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides an integrated reactor for removing trace antibiotics in composite polluted surface water. The reactor of the invention is an integrated reactor which is coupled with the conventional flocculation-carrier flocculation-inclined plate sedimentation-ultrafiltration process and aims to remove trace antibiotics in the complex polluted surface water. The method comprises the steps of removing most conventional pollutants (suspended particles, humic acid and the like) in the composite polluted surface water by using conventional flocculation; then selecting bentonite or montmorillonite as a carrier, selecting an amino acid modified chitosan-based flocculant or a pH and temperature dual-sensitive chitosan flocculant as a coagulant aid, and removing most trace antibiotics and the remaining conventional pollutants by utilizing carrier flocculation; the inclined plate sedimentation and the ultrafiltration membrane filtration are utilized to further remove the conventional pollutants, antibiotics and other substances in the water body, thereby improving the water quality.
The invention also provides a method for removing the trace antibiotics in the complex polluted surface water, which has the advantages of high performance, economy, feasibility, simple operation and maintenance and easy realization in engineering reconstruction.
The technical scheme is as follows: in order to achieve the purpose, the integrated reactor for removing trace antibiotics in the composite polluted surface water comprises a feeding pump, a first conventional flocculation tank, a second conventional flocculation tank, a carrier flocculation mixing tank, a carrier flocculation reaction tank, an inclined plate sedimentation tank and an ultrafiltration tank which are sequentially connected; an inorganic flocculant storage tank is arranged above the first conventional flocculation tank, an organic flocculant storage tank is arranged above the second conventional flocculation tank, and a coagulant aid storage tank is arranged above the carrier flocculation reaction tank; the first conventional flocculation tank, the second conventional flocculation tank, the carrier flocculation mixing tank and the carrier flocculation reaction tank are all provided with mechanical stirrers; the bottoms of the first conventional flocculation tank, the second conventional flocculation tank, the carrier flocculation mixing tank, the carrier flocculation reaction tank, the inclined plate sedimentation tank and the ultrafiltration tank are all provided with sludge discharge pipes; each sludge discharge pipe is connected with the hydrocyclone through a sludge circulating pump; the hydrocyclone is positioned above the carrier flocculation mixing tank.
In the invention, an inorganic flocculant storage tank is arranged above a first conventional flocculation tank, an organic flocculant storage tank is arranged above a second conventional flocculation tank, and a coagulant aid storage tank is arranged above a carrier flocculation reaction tank; wherein, the inorganic flocculant storage tank, the organic flocculant storage tank and the coagulant aid storage tank can be arranged right above or not, and finally, the flocculant and the coagulant aid are injected by a feeding pump, and the positions of the storage tanks are not unique; the hydrocyclone mainly separates the carrier from impurities, then recovers a part of the carrier, and directly puts the recovered carrier into a carrier flocculation mixing pool. When the operation is started, in the initialization stage, the carrier is added manually for initialization, and then part of flocs are recovered as the carrier.
Preferably, the first conventional flocculation tank is communicated with the lower end of the second conventional flocculation tank, the upper end of the second conventional flocculation tank is communicated with the upper end of the ballasted flocculation mixing tank, the liquid level of the ballasted flocculation mixing tank is lower than that of the second conventional flocculation tank, water enters the ballasted flocculation mixing tank in an overflow mode, the ballasted flocculation mixing tank is communicated with the lower end of the ballasted flocculation reaction tank, the upper ends of the ballasted flocculation reaction tank, the inclined plate sedimentation tank and the ultrafiltration tank are communicated, and the water enters the inclined plate sedimentation tank from the ballasted flocculation reaction tank in an overflow mode and then enters the ultrafiltration tank in an overflow mode. The parts are separated by partition plates, and water flows into the next part from the lower end of the previous part or flows into the next part from the upper end in an overflow mode.
Furthermore, an ultrafiltration membrane component is arranged in the ultrafiltration tank, and a bubbler is arranged below the ultrafiltration membrane component.
Preferably, the ultrafiltration membrane component is an immersed membrane component, the component is a hollow fiber membrane, and the ultrafiltration membrane is made of polyvinylidene fluoride; the aperture range of the ultrafiltration membrane is between 0.1 and 0.2 mu m, and the membrane flux of the ultrafiltration membrane is between 20 and 50L/m2·h。
And a water outlet pipe is arranged above the super filter tank and is respectively connected with the vacuum gauge and the suction pump.
Further, the bubbler is connected with an air compressor through an aeration pipeline.
The method for removing the trace antibiotics in the composite polluted surface water comprises the following steps:
(1) injecting surface water polluted by antibiotics into the first conventional flocculation tank by a feed pump, simultaneously adding an inorganic flocculant in an inorganic flocculant storage tank into the first conventional flocculation tank by a feeding pump, starting a mechanical stirrer, and uniformly mixing a water body and the inorganic flocculant under the action of mechanical stirring to generate flocculation;
(2) feeding the composite polluted surface water into a second conventional flocculation tank, feeding an organic flocculant in an organic flocculant storage tank into the second conventional flocculation tank through a feeding pump when the composite polluted surface water enters the second conventional flocculation tank, starting a mechanical stirrer, and fully reacting the organic flocculant with the composite polluted surface water under the action of mechanical stirring;
(3) the composite polluted surface water enters a carrier flocculation mixing tank, a carrier is added into the carrier flocculation mixing tank at the moment, and a mechanical stirrer is started to enable the carrier and the composite polluted surface water to fully act;
(4) the composite polluted surface water enters a carrier flocculation reaction tank, coagulant aid is added into the carrier flocculation reaction tank through a coagulant aid storage tank, and a mechanical stirrer is started to enable the coagulant aid and the composite polluted surface water to fully play a role of carrier flocculation;
(5) after flocculation by a carrier, overflowing the composite polluted surface water to an inclined plate sedimentation tank, finally overflowing the water subjected to the action of the inclined plate sedimentation tank to an ultrafiltration tank, and discharging the water subjected to ultrafiltration in the ultrafiltration tank out of the whole reactor under the suction action of a suction pump;
(6) and the sludge in the first conventional flocculation tank, the second conventional flocculation tank, the carrier flocculation mixing tank, the carrier flocculation reaction tank, the inclined plate sedimentation tank and the ultrafiltration tank is pumped into the hydrocyclone for separation through a sludge discharge pipe and a sludge circulating pump, and the carrier is recovered.
Wherein the inorganic flocculant is alum or polyaluminium chloride; the organic flocculant is polyacrylamide; the carrier may be bentonite or montmorillonite; the coagulant aid is chitosan-based flocculant modified by amino acid or chitosan flocculant with dual sensitivity of pH and temperature.
Further, the water after ultrafiltration in the ultrafiltration tank in the step (5) is discharged out of the whole reactor, namely the water in the ultrafiltration tank is discharged out of the reactor through the suction action of a suction pump; when water enters the ultrafiltration tank, air is pumped into the water through an air compressor, the air is aerated through a bubbler, and attachments on the surface of the ultrafiltration membrane filaments are scrubbed by utilizing the air shearing action.
Preferably, the hydraulic retention time of the inclined plate sedimentation tank in the step (5) is 20-40 min; the hydraulic retention time of the composite polluted surface water flowing through the ultrafiltration pool is 20-60 min; the gas-water ratio of the bubbler for aeration is 5: 1-150: 1, namely the gas-water ratio in the area of the ultrafiltration membrane filtering unit is 5: 1-150: 1.
in the integrated reactor, the first conventional flocculation mixing tank and the second conventional flocculation reaction tank are mainly used for removing conventional pollutants (suspended particles, humus and the like) in the composite polluted surface water, wherein the added inorganic flocculant is alum or polyaluminium chloride, the adding amount of the alum or the polyaluminium chloride in the first conventional flocculation tank is 10-20 ppm (the final concentration after adding, the same below), and the adding amount of the organic flocculant (polyacrylamide) in the second conventional flocculation tank is 40-60 ppm; and the stirring speed of the stirrer in the first conventional flocculation tank is 150-250 r/min, and the stirring speed of the stirrer in the second conventional flocculation tank is 20-80 r/min.
In the integrated reactor, the main functions of the carrier flocculation mixing tank and the carrier flocculation reaction tank are to remove most of trace antibiotics and residual conventional pollutants, the carrier can be bentonite or montmorillonite, the adding amount of the carrier in the carrier flocculation mixing tank is 0.05-0.3 ppm, the carrier is promoted to be wrapped by the initial floc through mechanical stirring, suspended particles in surface water form coarse flocs with the carrier, and the corresponding mechanical stirring speed is 20-80 r/min; the coagulant aid is an amino acid modified chitosan-based flocculant (ZL201610097336.3) or a pH and temperature dual-sensitive chitosan flocculant (ZL201510140315.0), the dosage of the coagulant aid in the carrier flocculation reaction tank is 10-20 ppm, and the stirring speed of a corresponding mechanical stirrer is 20-80 r/min.
In the integrated reactor, the inclined plate sedimentation tank and the ultrafiltration tank mainly have the function of removing residual trace antibiotics and other pollutants. The hydraulic retention time of the inclined plate sedimentation tank is 20-40 min, and the inclined plate sedimentation tank is used for separating water and alum particles from the surface water treated by the carrier flocculation reaction tank; the hydraulic retention time of water in a membrane filtration area of the ultrafiltration tank is 20-60 min, and the ultrafiltration tank is used for further removing conventional unsettled pollutants and trace antibiotics in the composite polluted surface water, wherein the trace antibiotics are mainly removed; the effluent of the inclined plate sedimentation tank flows through the ultrafiltration membrane component through the suction effect of the suction pump. A water outlet pipe is arranged above the ultrafiltration membrane component, a suction pump is arranged on the water outlet pipe, and under the action of the suction pump, water in the ultrafiltration membrane enters the inner side from the outer side of the membrane and finally flows out through the water outlet pipe; the negative pressure formed on the ultrafiltration membrane component by the suction pump is controlled between 10kPa and 60kPa through a vacuum gauge.
In order to ensure the membrane flux, the ultrafiltration membrane needs to be regularly back-washed in the running process of the device, and the back-washing water is the effluent treated by the ultrafiltration membrane component. Under the action of the back washing pump, back washing water flows out from the inner side to the outer side of the membrane, and pollutants attached to the surface of the membrane are separated from the surface of the membrane.
A bubbler is arranged below an ultrafiltration membrane component in the integrated reactor, air is pumped into water through an air compressor, and attachments on the surface of ultrafiltration membrane filaments are scrubbed by utilizing the shearing action of the air. The aeration device can be a perforated aeration pipe or an aeration head and the like.
The bottom of each reaction tank and the lower part of the ultrafiltration membrane component are provided with sludge discharge pipes. Impurities such as particles and flocs with higher density in water enter a sludge discharge pipe under the action of gravity, are pumped into a hydrocyclone through a sludge circulating pump, settle and separate carriers through the hydrocyclone under the action of centrifugal force, and throw the recovered carriers into a carrier flocculation mixing tank again for use, and discharge the parts except the carriers after the action of the hydrocyclone; the sludge discharge period can be 12-48 hours.
The invention constructs an integrated reactor by coupling a conventional flocculation unit, a carrier flocculation unit, an inclined plate sedimentation unit and an ultrafiltration membrane filtration unit, selects an amino acid modified chitosan-based flocculant or a pH and temperature dual sensitive chitosan flocculant as a coagulant aid, and uses bentonite or montmorillonite as a carrier, thereby greatly improving the removal efficiency of trace antibiotics in the composite polluted surface water.
The method comprises the steps of removing most conventional pollutants (suspended particles, humus and the like) in the composite polluted surface water by using conventional flocculation; then selecting bentonite or montmorillonite as a carrier, selecting an amino acid modified chitosan-based flocculant or a pH and temperature dual-sensitive chitosan flocculant as a coagulant aid, and removing most trace antibiotics and the remaining conventional pollutants by utilizing carrier flocculation; the substances such as residual conventional pollutants, antibiotics and the like in the water body are further removed by utilizing the functions of inclined plate sedimentation and ultrafiltration membrane filtration, so that the water quality is improved. The carrier in the sludge discharged from the reactor is recovered and recycled by using the hydrocyclone, thereby reducing the use amount of the carrier to a certain extent. Air is supplied to the water by an aeration device, and attachments on the surface of the ultrafiltration membrane filaments are scrubbed by air shearing action. The fallen sludge enters a sludge discharge pipe under the action of gravity and is pumped into a hydrocyclone for separation through a sludge circulating pump.
The invention discloses a method for removing trace antibiotics in complex polluted surface water, which comprises the following steps: injecting surface water polluted by antibiotics into the first conventional flocculation tank by a feed pump, and simultaneously adding an inorganic flocculant into the surface water, under the action of the stirrer, the water body is uniformly mixed with the inorganic flocculant and generates flocculation, then enters a second conventional flocculation tank through the lower end of the first conventional flocculation tank, when the composite polluted surface water enters the second conventional flocculation tank, adding an organic flocculant into the second conventional flocculation tank, starting a stirrer to enable the organic flocculant to fully act with the composite polluted surface water, then enabling the composite polluted surface water to enter a ballasting flocculation unit, overflowing to an inclined plate sedimentation tank after the ballasting flocculation, finally overflowing to an ultrafiltration tank provided with an ultrafiltration membrane component after the action of the inclined plate sedimentation tank, compressed air is provided for aeration by the aeration device, and the treated water flows out of the reactor through the suction of a suction pump connected with a water outlet pipe arranged above the ultrafiltration membrane component.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1. the integrated reactor for removing the trace antibiotics in the composite polluted surface water combines conventional flocculation, carrier flocculation, inclined plate sedimentation, ultrafiltration membrane filtration and the like, and through the synergistic effect of different reactor processes, the aim of removing the trace antibiotics in the composite polluted surface water which is difficult to realize in the prior art is fulfilled while the removal of conventional pollutants such as suspended particles and humus is guaranteed, and the water quality safety of effluent is fully guaranteed.
2. The whole reactor is light, small in occupied area, low in operation cost, high in automation degree and convenient to operate and manage.
3. The reactor provided by the invention has the carrier circulating device, so that the use amount of carriers is reduced to a certain extent, the waste is treated by waste, the sludge production is reduced, and the efficiency is improved.
4. The method for removing trace antibiotics in the composite polluted surface water by using the reactor has the advantages of high performance, economy, feasibility, simple operation and maintenance and easy realization in engineering modification, and fully ensures the microbial safety of the effluent.
5. The reactor of the invention can effectively control membrane pollution, prolong the service life of the ultrafiltration membrane and further reduce the operation cost.
6. The reactor of the invention has easily enlarged treatment capacity and can be flexibly selected according to actual treatment requirements.
7. The reactor disclosed by the invention is easy to realize vehicle-mounted, and is convenient to move, flexibly use and use for water quality emergency treatment.
Drawings
FIG. 1 is a schematic structural diagram of an integrated reactor for removing trace antibiotics from complex contaminated surface water according to the present invention.
The elements labeled in fig. 1 correspond to: 1-a feed pump; 2-a mechanical stirrer; 3-inorganic flocculant storage tank; 4-organic flocculant storage tank; 5-a coagulant aid storage tank; 6-a first conventional flocculation tank; 7-a second conventional flocculation tank; 8-a carrier flocculation mixing tank; 9-a carrier flocculation reaction tank; 10-a sludge discharge pipe; 11-an inclined plate sedimentation tank; 12-a super filter; 13-a sludge discharge valve of the flocculation tank; 14-a mud valve of the inclined plate sedimentation tank; 15-a mud valve of the ultrafiltration tank; 16-an air valve; 17-water outlet/backwash valve; 18-flocculant feed valve; 19-a water inlet valve; 20-flocculant adding pump; 21-suction/backwash pump; 22-sludge circulating pump; 23-a bubbler; 24-an ultrafiltration membrane module; 25-an air compressor; 26-an aeration pipeline; 27-vacuum gauge; 28-a hydrocyclone; 29-water outlet pipe, wherein the horizontal line above each pool in the figure is a liquid level line.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the drawings.
Example 1
As shown in fig. 1, an integrated reactor for removing trace antibiotics in complex polluted surface water comprises a feed pump 1, a first conventional flocculation tank 6, a second conventional flocculation tank 7, a carrier flocculation mixing tank 8, a carrier flocculation reaction tank 9, an inclined plate sedimentation tank 11 and an ultrafiltration tank 12 which are connected in sequence; the first conventional flocculation tank 6 is communicated with the lower end of a second conventional flocculation tank 7, the second conventional flocculation tank 7 is communicated with the upper end of a ballasted flocculation mixing tank 8, water enters the ballasted flocculation mixing tank 8 in an overflow mode, the ballasted flocculation mixing tank 8 is communicated with the lower end of a ballasted flocculation reaction tank 9, the ballasted flocculation reaction tank 9 is communicated with the upper end of an inclined plate sedimentation tank 11, and the inclined plate sedimentation tank 11 is communicated with the upper end of an ultrafiltration tank 12; the water in the carrier flocculation reaction tank 9 enters an inclined plate sedimentation tank 11 in an overflowing manner, and the water in the inclined plate sedimentation tank 11 also enters a super filter 12 in an overflowing manner.
An inorganic flocculant storage tank 3 is arranged above the first conventional flocculation tank 6, an organic flocculant storage tank 4 is arranged above the second conventional flocculation tank 7, and a coagulant aid storage tank 5 is arranged above the carrier flocculation reaction tank 9; the first conventional flocculation tank 6, the second conventional flocculation tank 7, the carrier flocculation mixing tank 8 and the carrier flocculation reaction tank 9 are all provided with a mechanical stirrer 2; the bottoms of the first conventional flocculation tank 6, the second conventional flocculation tank 7, the carrier flocculation mixing tank 8, the carrier flocculation reaction tank 9, the inclined plate sedimentation tank 11 and the ultrafiltration tank 12 are provided with sludge discharge pipes 10; each sludge discharge pipe 10 is connected with a hydrocyclone 28 through a sludge circulating pump 22, and sludge is pumped into the hydrocyclone 28 for separation under the action of the sludge circulating pump 22; a hydrocyclone 28 is located above the ballasted flocculation mixing tank 8.
An ultrafiltration membrane component 24 is arranged in the ultrafiltration filter 12, and a bubbler 23 is arranged below the ultrafiltration membrane component 24; the ultrafiltration membrane component 24 is an immersed membrane component, the component is a hollow fiber membrane, and the material of the ultrafiltration membrane is polyvinylidene fluoride; the aperture range of the ultrafiltration membrane is between 0.01 and 0.2 mu m, and the membrane flux of the ultrafiltration membrane is 20 to 50L/m2H. A water outlet pipe 29 is arranged above the super filter 12, the water outlet pipe 29 is respectively connected with the vacuum meter 27 and the suction pump 21, and water is discharged out of the reactor through the suction action of the suction pump 21; the bubbler 23 is connected to an air compressor 25 through an aeration line 26, and the aeration line 26 may be a perforated aeration pipe, an aeration head, or the like.
A feed pump 1 in the whole reactor is connected with a water inlet valve 19 to control feeding; flocculation tank mud valves 13 are arranged between the sewage discharge pipe 10 of the first conventional flocculation tank 6, the second conventional flocculation tank 7, the carrier flocculation mixing tank 8 and the carrier flocculation reaction tank 9 and a sludge circulating pump 22, an inclined plate sedimentation tank mud valve 14 is arranged between the inclined plate sedimentation tank 11 and the sludge circulating pump 22, and an ultrafiltration tank mud valve 15 is arranged between the ultrafiltration tank 12 and the sludge circulating pump 22 and used for controlling sludge discharge; an air valve 16 is arranged between the aeration line 26 and the air compressor 25 for controlling air intake; a water outlet/back flushing valve 17 is arranged between the water outlet pipe 29 and the suction pump 21 respectively; a flocculating agent feeding valve 18 and a flocculating agent feeding pump 20 are arranged between the first conventional flocculating tank 6 and the inorganic flocculating agent storage tank 3, between the second conventional flocculating tank 7 and the organic flocculating agent storage tank 4 and between the carrier flocculation reaction tank 9 and the coagulant aid storage tank 5 for controlling the addition of flocculating agent.
Example 2
The method for removing the trace antibiotics in the complex polluted surface water by establishing the integrated reactor in the example 1 comprises the following steps: injecting composite polluted surface water into a first conventional flocculation tank 6 through a feed pump 1, wherein the inflow rate of the water is 11.1ml/min, simultaneously, opening a flocculant feed valve 18, injecting alum in an inorganic flocculant storage tank 3 into the first flocculation tank 6 by using a flocculant adding pump 20, wherein the adding amount of the alum is 10ppm, starting a mechanical stirrer 2, the rotating speed of the stirrer is 200r/min, fully mixing the composite polluted surface water and the alum, and performing flocculation, allowing the surface water treated by the first conventional flocculation tank 6 to flow into a second conventional flocculation tank 7 from a communication part at the lower ends of the two tanks, opening the flocculant feed valve 18 while the surface water flows, using the flocculant adding pump 20, adding polyacrylamide into the second conventional flocculation tank 7 through an organic flocculant storage tank 4, wherein the adding amount is 50ppm, and allowing the polyacrylamide to fully act with the surface water under the action of the mechanical stirrer 2, at the moment, the stirring speed of the stirrer is 50r/min, then the surface water overflows from the second conventional flocculation tank 7 to the carrier flocculation mixing tank 8, the carrier is added into the flocculation mixing tank 8, the mechanical stirrer 2 is started, the stirring speed of the corresponding stirrer is 60rpm, and the carrier and the composite polluted surface water fully act; the carriers in the carrier flocculation mixing tank 8 mainly come from two aspects, one part is from the carriers recovered by the hydrocyclone 28, the other part is newly supplemented carriers, the added carriers are montmorillonite, and the adding amount is 0.2 ppm; then surface water enters the carrier flocculation reaction tank 9, a flocculating agent feed valve 18 is opened, and flocculating agent is thrown into the surface waterA pump 20 is added to a carrier flocculation reaction tank 9 through a coagulant aid storage tank 5, a coagulant aid pH and temperature dual-sensitive chitosan flocculant is added, the corresponding adding amount is 10ppm, a mechanical stirrer 2 is started, the stirring speed of the corresponding stirrer is 60rpm, and the coagulant aid and the composite polluted surface water are subjected to full carrier flocculation; then, the wastewater acted by the flocculation reaction tank 9 overflows to an inclined plate sedimentation tank 11, the retention time of the composite polluted surface water in the inclined plate sedimentation tank 11 is 20 minutes, finally, the water acted by the inclined plate sedimentation tank 11 overflows to an ultrafiltration tank 12 provided with an ultrafiltration membrane component, and the water in the ultrafiltration tank 12 is discharged out of the reactor through the suction action of a suction pump; when water enters the ultra-filtration tank 12, pumping air into the water through an air compressor 25 to aerate the water by a bubbler 23 when the water enters the ultra-filtration tank 12, scrubbing attachments on the surfaces of ultrafiltration membrane filaments by utilizing the shearing action of the air, and keeping the water in an ultrafiltration membrane filtering area provided with a hollow fiber membrane for 30 minutes; the adopted hollow fiber membrane is an immersed membrane component, and the ultrafiltration membrane is made of polyvinylidene fluoride; the aperture of the ultrafiltration membrane is 0.1 μm, and the membrane flux of the ultrafiltration membrane is 30L/m2·h。
A method for removing trace antibiotics in composite polluted surface water comprises the steps that the composite polluted surface water firstly flows through a first conventional flocculation tank 6 and a second conventional flocculation tank 7, most of conventional pollutants such as suspended particles, humus and the like and a small amount of antibiotics in the composite polluted surface water are removed through a flocculation process, then most of trace antibiotics and residual conventional pollutants in the composite polluted surface water are removed through a carrier flocculation unit carrier flocculation mixing tank 8 and a carrier flocculation reaction tank 9, a water outlet/back flushing valve 17 is opened, the composite polluted surface water in a super-filtration tank 12 enters the inner side from the outer side of a membrane through the suction effect of a suction pump 21 and finally flows through an ultrafiltration membrane filtration unit, and the water in the super-filtration tank enters the inner side from the outer side of the membrane and finally flows out through a water outlet pipe; the negative pressure generated by the suction pump on the ultrafiltration membrane module is controlled at 10kPa by a vacuum gauge 27.
And the backwashing period of the ultrafiltration membrane group 24 is 30 minutes, the membranes can be kept, the service life of the membranes is prolonged, the air valve 16 is opened, compressed air is pumped into water through the air compressor 25, and the air-water ratio in the ultrafiltration membrane filtering unit area is 5: 1. and opening a flocculation tank mud discharge valve 13, an inclined plate sedimentation tank mud discharge valve 14, an ultrafiltration tank mud discharge 15 and mud discharge pipes 10 in all the grooves of the reactor, discharging the mud through the mud discharge pipes, and pumping the mud into a hydrocyclone 28 through a mud circulating pump 22 for separation, wherein the mud discharge period is 36 hours.
In this example, sulfapyridine was added to the water to be treated at a concentration of 10. mu.g/L, turbidity of 25NTU, UV2540.35, the concentration of the antibiotics in the effluent is 0.4 mug/L, the removal rate is as high as 95.5%, the turbidity of the effluent is 0.25NTU, the removal rate is as high as 99%, and UV is treated by the method254The removal rate is 0.003, the removal rate is as high as 99.1 percent, and the specific effluent conditions of each stage are shown in the table I.
Example 3
The method for removing the trace antibiotics in the complex polluted surface water by establishing the integrated reactor in the example 1 comprises the following steps: injecting composite polluted surface water into the first conventional flocculation tank 6 through a feed pump 1, wherein the inflow rate of the water is 8.33ml/min, simultaneously, opening a flocculant feed valve 18, injecting alum in an inorganic flocculant storage tank 3 into the first flocculation tank by using a flocculant adding pump 20, the adding amount of the alum is 15ppm, starting a mechanical stirrer 2, the stirring speed of the stirrer is 180r/min, fully mixing the composite polluted surface water and the alum, performing flocculation, allowing the surface water treated by the first conventional flocculation tank 6 to flow into a second conventional flocculation tank 7 from a communication part at the lower ends of the two tanks, opening the flocculant feed valve 18 while allowing the surface water to flow, adding polyacrylamide into the second conventional flocculation tank 7 through an organic flocculant storage tank 4 by using the flocculant adding pump 20, wherein the adding amount is 40ppm, and allowing the polyacrylamide to fully act with the surface water under the action of the stirrer, the stirring speed of the stirrer is 40r/min, then the surface water overflows from the second conventional flocculation tank 7 to the carrier flocculation mixing tank 8, a carrier is added into the carrier flocculation mixing tank 8, the mechanical stirrer 2 is started, the stirring speed of the corresponding mechanical stirrer is 50rpm, and the carrier and the composite polluted surface water are fully acted; the carriers in the flocculation mixing tank 8 mainly come from two aspects, one part is from the carriers recovered by the hydrocyclone 28, the other part is newly supplemented with the carriers, and the added carriers are bulkedMoistening soil, the adding amount is 0.1 ppm; then, surface water enters a carrier flocculation reaction tank 9, a flocculant feeding valve 18 is opened, and a flocculant adding pump 20 is used for adding a coagulant aid amino acid modified chitosan-based flocculant ZL201610097336.3 into the carrier flocculation reaction tank through a coagulant aid storage tank 5, wherein the corresponding adding amount is 15 ppm; starting a mechanical stirrer, wherein the corresponding stirring speed is 50rpm, so that the coagulant aid and the composite polluted surface water fully play a role of carrier flocculation; then the wastewater acted by the carrier flocculation unit overflows to an inclined plate sedimentation tank 11, the retention time of the composite polluted surface water in the inclined plate sedimentation tank is 30 minutes, finally the water acted by the inclined plate sedimentation tank 11 overflows to an ultrafiltration tank 12 provided with an ultrafiltration membrane component, and the water in the ultrafiltration membrane tank 12 is discharged out of the reactor through the suction action of a suction pump; when water enters the ultrafiltration membrane pool 12, pumping air into the water through an air compressor 25, scrubbing attachments on the surfaces of ultrafiltration membrane filaments by utilizing the shearing action of the air, and keeping the water in a ultrafiltration membrane filtering area provided with the hollow fiber membrane for 40 minutes; the adopted hollow fiber membrane is an immersed membrane component, and the ultrafiltration membrane is made of polyvinylidene fluoride; the pore diameter of the ultrafiltration membrane is 0.2 mu m, and the membrane flux of the ultrafiltration membrane is 50L/m2·h。
The method for removing the antibiotics in the composite polluted wastewater comprises the steps of firstly passing through a first conventional flocculation tank 6 and a second conventional flocculation tank 7, removing most of conventional pollutants such as suspended particles, humic acid and the like and a small amount of antibiotics in the composite polluted surface water through a flocculation process, then removing most of trace antibiotics and residual conventional pollutants in the composite polluted surface water through a carrier flocculation unit carrier flocculation mixing tank 8 and a carrier flocculation reaction tank 9, opening a water outlet/back flush valve 17 to enable the wastewater in an ultrafiltration tank to enter the inner side from the outer side of a membrane through the suction effect of a suction pump 21, enabling the wastewater to finally flow through an ultrafiltration membrane filtration unit, enabling the water in the ultrafiltration tank to enter the inner side from the outer side of the membrane, and finally flowing out through a water outlet pipe; the negative pressure generated by the suction pump on the ultrafiltration membrane module is controlled at 30kPa by a vacuum gauge 27
And the backwashing period of the ultrafiltration membrane component is 30 minutes. Opening an air valve 16 to pump compressed air into the water through an air compressor 25, wherein the air-water ratio range in the ultrafiltration membrane filtering unit area is 15: 1. and opening a flocculation tank mud valve 13, an inclined plate sedimentation tank mud valve 14 and an ultrafiltration tank mud valve 15, discharging the sludge in each tank of the reactor through a mud pipe, and pumping the sludge into a hydrocyclone for separation through a sludge circulating pump, wherein the mud discharging period is 48 hours.
The norfloxacin concentration in the water to be treated is 12 mu g/L, the turbidity is 23NTU, and the UV is2540.31, the concentration of the antibiotics in the effluent is 0.3 mug/L, the removal rate is up to 92 percent, the turbidity of the effluent is 0.2NTU, the removal rate is up to 99.1 percent, and the UV is treated by the method254The removal rate is as high as 99%, and the specific water outlet conditions of each stage are shown in table two.
Example 4
The method for removing the trace antibiotics in the complex polluted surface water by establishing the integrated reactor of the embodiment 1 comprises the following steps: injecting wastewater into the first conventional flocculation tank 6 through the feed pump 1, wherein the inflow rate of the wastewater is 16.6ml/min, simultaneously opening a flocculant feed valve 18, injecting polyaluminum chloride in an inorganic flocculant storage tank 3 into the first conventional flocculation tank by using a flocculant adding pump 20, wherein the adding amount of the polyaluminum chloride is 20ppm, starting a mechanical stirrer 2, the rotating speed of the stirrer is 160r/min, fully mixing the composite polluted surface water and the polyaluminum chloride to generate flocculation, allowing the surface water treated by the first conventional flocculation tank 6 to flow into a second conventional flocculation tank 7 from a communication part at the lower ends of the two tanks, opening the flocculant feed valve 18 while allowing the surface water to flow, adding polyacrylamide into the second conventional flocculation tank 7 through an organic flocculant storage tank by using the flocculant adding pump 20, wherein the adding amount is 60ppm, and allowing the polyacrylamide to fully act with the surface water under the action of the stirrer, at the moment, the rotating speed of the corresponding stirrer is 30r/min, then the surface water overflows from the second conventional flocculation tank 7 to the ballasted flocculation mixing tank 8, a carrier is added into the ballasted flocculation mixing tank 8, the mechanical stirrer 2 is started, the stirring speed of the corresponding stirrer is 40rpm, the flocculation aid and the composite polluted surface water fully generate the ballasted flocculation effect, the carriers in the ballasted flocculation mixing tank 8 mainly come from two aspects, one part of the carriers comes from the carriers recovered by the hydrocyclone 28, the other part of the carriers is newly supplemented, andthe added carrier is bentonite, the adding amount is 0.25ppm, then a surface water carrier flocculation reaction tank 9 is started, a flocculant feeding pump 18 is started, a flocculant adding pump 20 is used for adding a coagulant aid pH and temperature dual-sensitive chitosan flocculant ZL201510140315.0 into the carrier flocculation reaction tank 9 through a coagulant aid storage tank 5, the corresponding adding amount is 18ppm, a mechanical stirrer 2 is started, the stirring speed of the corresponding stirrer is 40rpm, the coagulant aid and the composite polluted surface water fully play a carrier flocculation role, then the wastewater acted by the carrier flocculation reaction tank 9 overflows to an inclined plate sedimentation tank 11, the residence time of the composite polluted surface water in the inclined plate sedimentation tank is 40 minutes, finally the water acted by the inclined plate sedimentation tank 11 overflows to an ultrafiltration tank 12 provided with an ultrafiltration membrane component, and the water in the ultrafiltration membrane tank 12 is discharged out of the reactor through the suction effect of a suction pump; when water enters the ultrafiltration membrane pool 12, pumping air into the water through an air compressor 25, scrubbing attachments on the surfaces of ultrafiltration membrane filaments by utilizing the shearing action of the air, and keeping the hydraulic retention time of the water in an ultrafiltration membrane filtering area provided with the hollow fiber membrane for 60 minutes; the adopted hollow fiber membrane is an immersed membrane component, and the ultrafiltration membrane is made of polyvinylidene fluoride; the aperture of the ultrafiltration membrane is 0.15 μm, and the membrane flux of the ultrafiltration membrane is 20L/m2·h。
According to the method for removing the antibiotics in the composite polluted wastewater, the composite polluted surface water firstly passes through a first conventional flocculation tank 6 and a second conventional flocculation tank 7, most of conventional pollutants such as suspended particles, humus and the like and a small amount of antibiotics in the composite polluted surface water are removed through a flocculation process, then most of trace antibiotics and residual conventional pollutants in the composite polluted surface water are removed through a carrier flocculation unit carrier flocculation mixing tank 8 and a carrier flocculation reaction tank 9, a water outlet/back flushing valve 17 is opened, the composite polluted surface water in an ultrafiltration tank enters the inner side from the outer side of a membrane through the suction effect of a suction pump and finally flows through an ultrafiltration membrane filtration unit, and the water in the ultrafiltration tank enters the inner side from the outer side of the membrane and finally flows out through a water outlet pipe; the negative pressure generated by the suction pump on the ultrafiltration membrane module is controlled at 50kPa by the vacuum gauge 27.
And (3) a backwashing period of the ultrafiltration membrane assembly is 30 minutes, an air valve 16 is opened, compressed air is pumped into water through an air compressor, and the air-water ratio range in the ultrafiltration membrane filtering unit area is 60: 1. and opening a flocculation tank mud discharge valve 13, an inclined plate sedimentation tank mud discharge valve 14, an ultrafiltration tank mud discharge valve 15 and mud discharge pipes 10 in all the tanks, discharging the mud through the mud discharge pipes, and pumping the mud into a hydrocyclone for separation through a mud circulating pump, wherein the mud discharge period is 24 hours.
The concentration of tylosin in the water to be treated is 9 mug/L, the turbidity is 22NTU, and the UV is2540.40, the concentration of the antibiotics in the effluent is 0.2 mug/L, the removal rate is up to 97 percent, the turbidity of the effluent is 0.2NTU, the removal rate is up to 99.1 percent, and the UV is treated by the method254The removal rate is 0.001 percent and is as high as 99.8 percent, and the specific effluent conditions of each stage are shown in the table III.
Example 5
An integrated reactor for the removal of antibiotics from complex contaminated surface water was set up as in example 1. The method for removing the antibiotics in the composite polluted surface water by using the integrated reactor comprises the following steps:
injecting composite polluted surface water into the first conventional flocculation tank 6 through the feed pump 1, wherein the inflow rate of the inflow water is 12.5ml/min, simultaneously, opening a flocculant feed pump 18, injecting polyaluminium chloride in an inorganic flocculant storage tank 3 into the first flocculation tank 6 by using a flocculant adding pump 20, the adding amount of the polyaluminium chloride is 16ppm, starting a mechanical stirrer 2, stirring at the speed of 170r/min, fully mixing the composite polluted surface water and the polyaluminium chloride, performing flocculation, allowing the surface water treated by the first conventional flocculation tank 6 to flow into a second conventional flocculation tank 7 from a communication part at the lower ends of the two tanks, opening the flocculant feed pump 18 while the surface water flows, adding polyacrylamide into the second conventional flocculation tank 7 through an organic flocculant storage tank 4 by using the flocculant adding pump 20, wherein the adding amount is 45ppm, and allowing the polyacrylamide to fully act on the surface water under the action of the stirrer 2, at the moment, the corresponding stirring speed is 30r/min, then the surface water overflows from the second conventional flocculation tank 7 to the carrier flocculation mixing tank 8, the carrier is added into the carrier flocculation mixing tank 8 through the carrier storage tank, the mechanical stirrer 2 is started, the corresponding stirring speed of the stirrer is 50rpm, and the carrier and the composite polluted ground are enabled to be pollutedThe surface water has full effect; the carrier in the carrier flocculation mixing tank 8 mainly comes from two aspects, one part comes from the carrier recovered by the hydrocyclone 28, the other part is a newly supplemented carrier, the added carrier is bentonite, the adding amount is 0.25ppm, then surface water enters the carrier flocculation reaction tank 9, a flocculant feeding valve 18 is opened, a flocculant adding pump 20 is used for adding a coagulant aid pH and temperature dual sensitive chitosan flocculant ZL201510140315.0 into the carrier flocculation reaction tank 9 through a coagulant aid storage tank 5, the adding amount is 18ppm, a mechanical stirrer 2 is started, the stirring speed of the corresponding stirrer is 50rpm, and the coagulant aid and the composite polluted surface water fully play a carrier flocculation role; then the wastewater acted by the carrier flocculation reaction tank 9 overflows to an inclined plate sedimentation tank 11, the retention time of the composite polluted surface water in the inclined plate sedimentation tank is 35 minutes, finally the water acted by the inclined plate sedimentation tank 11 overflows to an ultrafiltration tank 12 provided with an ultrafiltration membrane component, and the water in the ultrafiltration membrane tank 12 is discharged out of the reactor through the suction action of a suction pump; when water enters the ultrafiltration membrane pool 12, pumping air into the water through an air compressor, scrubbing attachments on the surfaces of ultrafiltration membrane filaments by utilizing the shearing action of the air, and keeping the hydraulic retention time of the water in an ultrafiltration membrane filtering area provided with the hollow fiber membrane within 45 minutes; the adopted hollow fiber membrane is an immersed membrane component, and the ultrafiltration membrane is made of polyvinylidene fluoride; the aperture of the ultrafiltration membrane is 0.15 μm, and the membrane flux of the ultrafiltration membrane is 30L/m2·h。
According to the method for removing the antibiotics in the composite polluted surface water, the composite polluted surface water firstly passes through the first conventional flocculation tank 6 and the second conventional flocculation tank 7, most of conventional pollutants such as suspended particles, humus and the like and a small amount of antibiotics in the composite polluted surface water are removed through a flocculation process, then most of trace antibiotics and the rest of conventional pollutants in the wastewater are removed through the carrier flocculation unit carrier flocculation mixing tank 8 and the carrier flocculation reaction tank 9, the water outlet/back flush valve 17 is opened, the composite polluted surface water in the ultrafiltration tank enters the inner side from the outer side of the membrane through the pumping action of the suction pump, and finally flows out through the water outlet pipe; the negative pressure generated by the suction pump on the ultrafiltration membrane module was controlled at 60kPa by the vacuum gauge 27.
And (3) a backwashing period of the ultrafiltration membrane assembly is 30 minutes, an air valve 16 is opened, compressed air is pumped into water through an air compressor, and the air-water ratio range in the ultrafiltration membrane filtering unit area is 120: 1. and opening a flocculation tank mud discharge valve 13, an inclined plate sedimentation tank mud discharge valve 14, an ultrafiltration tank mud discharge valve 15 and mud discharge pipes 10 in all the grooves of the reactor, discharging mud through the mud discharge pipes, and pumping the mud into a hydrocyclone for separation through a mud circulating pump, wherein the mud discharge period is 32 hours.
The concentration of sulfadiazine in the water to be treated is 16 mug/L, the turbidity is 30NTU, and UV2540.60, the concentration of the antibiotics in the effluent is 0.3 mug/L, the removal rate is up to 98.1 percent, the turbidity of the effluent is 0.1NTU, the removal rate is up to 99.7 percent, and the UV is treated by the method254The removal rate is 0.005 and is as high as 99.2 percent, and the specific effluent conditions of each stage are shown in the fourth table.
Example 6
An integrated reactor for the removal of antibiotics from complex contaminated surface water was set up as in example 1. The method for removing the antibiotics in the composite polluted surface water by using the integrated reactor comprises the following steps:
injecting composite polluted surface water into the first conventional flocculation tank 6 through the feed pump 1, wherein the inflow rate of the water is 15ml/min, simultaneously, opening a flocculant feed pump 18, injecting polyaluminium chloride in an inorganic flocculant storage tank 3 into the first conventional flocculation tank 6 by using a flocculant adding pump 20, wherein the adding amount of the polyaluminium chloride is 18ppm, starting a mechanical stirrer 2, stirring at 250r/min to fully mix the composite polluted surface water and the polyaluminium chloride and generate flocculation, allowing the surface water treated by the first conventional flocculation tank 6 to flow into a second conventional flocculation tank 7 from a communication part at the lower ends of the two tanks, opening the flocculant feed pump 18 while the surface water flows in, adding polyacrylamide into the second conventional flocculation tank 7 through an organic flocculant storage tank 4 by using the flocculant adding pump 20, wherein the adding amount is 35ppm, and allowing the polyacrylamide to fully act with the surface water under the action of the stirrer, at the moment, the corresponding stirring speed is 45r/min, then the surface water overflows from the second conventional flocculation tank 7 to the carrier flocculation mixing tank 8, the carriers are added into the carrier flocculation mixing tank 8 through the carrier storage tank, andstarting the mechanical stirrer 2, wherein the stirring speed of the stirrer is 40rpm, so that the carrier and the composite polluted surface water fully act; the carriers in the carrier flocculation mixing tank 8 mainly come from two aspects, one part is from the carriers recovered by the hydrocyclone 28, the other part is the newly supplemented carriers, the added carriers are montmorillonite, the adding amount is 0.3ppm, then the surface water enters the carrier flocculation reaction tank 9, a flocculant feeding valve 18 is opened, a flocculant adding pump 20 is used, a coagulant aid amino acid modified chitosan-based flocculant 201610097336.3 is added into the carrier flocculation reaction tank 9 through a coagulant aid storage tank 5, the adding amount is 20ppm, a mechanical stirrer 2 is started, the stirring speed corresponding to the stirrer is 40rpm, and the coagulant aid and the surface water of the composite polluted land fully play a role in carrier flocculation; then the composite polluted surface water acted by the carrier flocculation reaction tank 9 overflows to an inclined plate sedimentation tank 11, the retention time of the composite polluted surface water in the inclined plate sedimentation tank is 35 minutes, finally the water acted by the inclined plate sedimentation tank 11 overflows to an ultrafiltration tank 12 provided with an ultrafiltration membrane component, and the water in the ultrafiltration membrane tank 12 is discharged out of the reactor through the suction action of a suction pump; when water enters the ultrafiltration membrane pool 12, compressed air is pumped into the water through an air compressor 25, attachments on the surfaces of ultrafiltration membrane filaments are scrubbed by utilizing the shearing action of the air, and the hydraulic retention time of the water in an ultrafiltration membrane filtering area provided with the hollow fiber membrane is 30 minutes; the adopted hollow fiber membrane is an immersed membrane component, and the ultrafiltration membrane is made of polyvinylidene fluoride; the aperture of the ultrafiltration membrane is 0.15 μm, and the membrane flux of the ultrafiltration membrane is 30L/m2·h。
According to the method for removing the antibiotics in the composite polluted wastewater, the composite polluted wastewater firstly passes through a first conventional flocculation tank 6 and a second conventional flocculation tank 7, most of conventional pollutants such as suspended particles, humus and the like and a small amount of antibiotics in the wastewater are removed through a flocculation process, then most of trace antibiotics and residual conventional pollutants in the composite polluted surface water are removed through a carrier flocculation mixing tank 8 and a carrier flocculation reaction tank 9, a water outlet/back flush valve 17 is opened, the composite polluted surface water in an ultrafiltration tank enters the inner side from the outer side of a membrane through the suction effect of a suction pump, and finally flows out through a water outlet pipe; the negative pressure generated by the suction pump on the ultrafiltration membrane module is controlled at 20kPa by a vacuum gauge 27.
And (3) opening an air valve 16 after the backwashing period of the ultrafiltration membrane module is 30 minutes, pumping compressed air into water through an air compressor, wherein the air-water ratio range in the ultrafiltration membrane filtering unit area is 150: 1. and opening a sludge discharge valve 13 of the flocculation tank, a sludge discharge valve 14 of the inclined plate sedimentation tank, a sludge discharge valve 15 of the ultrafiltration tank and sludge discharge pipes 10 in all the grooves of the reactor, discharging the sludge through the sludge discharge pipes 10, and pumping the sludge into a hydrocyclone for separation through a sludge circulating pump, wherein the sludge discharge period is 36 hours.
The concentration of tetracycline in the water to be treated was 8. mu.g/L, turbidity was 28NTU, UV254The method is adopted for treatment for 0.70, the concentration of the antibiotics in the effluent is 0.2 mu g/L, the removal rate is up to 97.5 percent, the turbidity of the effluent is 0.2NTU, the removal rate is up to 99.3 percent, and the UV is2540.005 and the removal rate is as high as 99.3 percent, and the specific effluent conditions of each stage are shown in the fifth table.
Watch 1
Note: inlet water turbidity: 25NTU, UV2540.35, 0.01ppm antibiotic,
1 is the effluent of a first conventional flocculation tank 2, the effluent of a second conventional flocculation tank 3 is the effluent of a carrier flocculation reaction tank 4, the effluent of an inclined plate sedimentation tank 5 is the effluent of an ultrafiltration tank
Watch 2
Note: inlet water turbidity: 23NTU, UV2540.31, 0.012ppm antibiotic,
1 is the effluent of a first conventional flocculation tank 2, the effluent of a second conventional flocculation tank 3 is the effluent of a carrier flocculation reaction tank 4, the effluent of an inclined plate sedimentation tank 5 is the effluent of an ultrafiltration tank
Watch III
Note: inlet water turbidity: 22NTU, UV2540.40, 0.009ppm antibiotic,
1 is the effluent of a first conventional flocculation tank 2, the effluent of a second conventional flocculation tank 3 is the effluent of a carrier flocculation reaction tank 4, the effluent of an inclined plate sedimentation tank 5 is the effluent of an ultrafiltration tank
Watch four
Note: inlet water turbidity: 30NTU, UV2540.6, 0.016ppm of antibiotic,
1 is the effluent of a first conventional flocculation tank 2, the effluent of a second conventional flocculation tank 3 is the effluent of a carrier flocculation reaction tank 4, the effluent of an inclined plate sedimentation tank 5 is the effluent of an ultrafiltration tank
Watch five
Note: inlet water turbidity: 28NTU, UV2540.70, 0.008ppm antibiotic,
1 is the effluent of a first conventional flocculation tank 2, the effluent of a second conventional flocculation tank 3 is the effluent of a ballasted flocculation reaction tank 4, the effluent of an inclined plate sedimentation tank 5 is the effluent of an ultrafiltration tank
From the above table, it can be seen that when the complex contaminated surface water passes through the flocculation unit, about 90% of the conventional contaminants and 80% of the antibiotics are removed; after the composite polluted surface water further flows through the inclined plate sedimentation tank and the ultrafiltration membrane tank, the content of conventional pollutants is further reduced, the removal rate is up to more than 99%, most of antibiotics are removed at the moment, and the removal rate is up to more than 95%, so that the device has high removal capacity for the conventional pollutants in the composite polluted surface water and also has high removal capacity for trace antibiotics in the composite polluted surface water.
Claims (4)
1. The method for removing the trace antibiotics in the composite polluted surface water is characterized by being implemented based on an integrated reactor for removing the trace antibiotics in the composite polluted surface water, wherein the reactor comprises a feeding pump (1), a first conventional flocculation tank (6), a second conventional flocculation tank (7), a carrier flocculation mixing tank (8), a carrier flocculation reaction tank (9), an inclined plate sedimentation tank (11) and an ultrafiltration tank (12) which are sequentially connected; an inorganic flocculant storage tank (3) is arranged above the first conventional flocculation tank (6), an organic flocculant storage tank (4) is arranged above the second conventional flocculation tank (7), and a coagulant aid storage tank (5) is arranged above the carrier flocculation reaction tank (9); the first conventional flocculation tank (6), the second conventional flocculation tank (7), the ballasted flocculation mixing tank (8) and the ballasted flocculation reaction tank (9) are all provided with a mechanical stirrer (2); the bottoms of the first conventional flocculation tank (6), the second conventional flocculation tank (7), the ballasted flocculation mixing tank (8), the ballasted flocculation reaction tank (9), the inclined plate sedimentation tank (11) and the ultrafiltration tank (12) are respectively provided with a sludge discharge pipe (10); each sludge discharge pipe (10) is connected with a hydrocyclone (28) through a sludge circulating pump (22); the hydrocyclone (28) is positioned above the carrier flocculation mixing tank (8);
the first conventional flocculation tank (6) is communicated with the lower end of a second conventional flocculation tank (7), the second conventional flocculation tank (7) is communicated with the upper end of a ballasted flocculation mixing tank (8), water enters the ballasted flocculation mixing tank (8) in an overflow mode, the ballasted flocculation mixing tank (8) is communicated with the lower end of a ballasted flocculation reaction tank (9), the ballasted flocculation reaction tank (9) is communicated with the upper end of an inclined plate sedimentation tank (11), the inclined plate sedimentation tank (11) is communicated with the upper end of an ultrafiltration tank (12), the liquid levels of the ballasted flocculation reaction tank (9), the inclined plate sedimentation tank (11) and the ultrafiltration tank (12) are sequentially reduced, and the water enters the inclined plate sedimentation tank (11) and the ultrafiltration tank (12) in an overflow mode;
an ultrafiltration membrane component (24) is arranged in the ultrafiltration tank (12), and a bubbler (23) is arranged below the ultrafiltration membrane component (24);
the ultrafiltration membrane component (24) is an immersed membrane component, and the ultrafiltration membrane is made of polyvinylidene fluoride; the aperture range of the ultrafiltration membrane is between 0.1 and 0.2 mu m, and the membrane flux of the ultrafiltration membrane is between 20 and 50L/m2•h；
The inorganic flocculant is alum or polyaluminium chloride; the organic flocculant is polyacrylamide; the carrier is bentonite or montmorillonite; the coagulant aid is an amino acid modified chitosan flocculant or a pH and temperature dual-sensitive chitosan flocculant; the amino acid modified chitosan flocculant is obtained by reacting chitosan with amino acid, and the structural formula of the flocculant is as follows:
the pH and temperature double-sensitive chitosan flocculant has a structural formula as follows:
wherein n ranges from 0.47 to 3.85, m ranges from 0.36 to 1.38;
the method comprises the following steps:
injecting composite polluted surface water polluted by antibiotics into a first conventional flocculation tank (6) by a feed pump (1), simultaneously throwing an inorganic flocculant in an inorganic flocculant storage tank (3) into the first conventional flocculation tank (6), starting a mechanical stirrer (2), and uniformly mixing a water body and the inorganic flocculant under the action of mechanical stirring to generate flocculation;
(II) enabling the composite polluted surface water to enter a second conventional flocculation tank (7), putting the organic flocculant in the organic flocculant storage tank (4) into the second conventional flocculation tank (7) when the composite polluted surface water enters the second conventional flocculation tank (7), starting a mechanical stirrer (2), and enabling the organic flocculant to fully act with the composite polluted surface water under the action of mechanical stirring;
(III) feeding the composite polluted surface water into a carrier flocculation mixing tank (8), adding a carrier into the carrier flocculation mixing tank (8), and starting a mechanical stirrer (2) to fully react the carrier and the composite polluted surface water;
(IV) the composite polluted surface water enters a carrier flocculation reaction tank (9), coagulant aids are added into the carrier flocculation reaction tank (9) through a coagulant aid storage tank (5), and a mechanical stirrer (2) is started to enable the coagulant aids to fully react with the composite polluted surface water;
(V) after being treated by the flocculation reaction tank with a carrier (9), the composite polluted surface water overflows to an inclined plate sedimentation tank (11), finally, the water acted by the inclined plate sedimentation tank (11) overflows to an ultrafiltration tank (12), and the water ultrafiltered by the ultrafiltration tank (12) is discharged out of the whole reactor;
and (sixthly), pumping the sludge in the first conventional flocculation tank (6), the second conventional flocculation tank (7), the ballasted flocculation mixing tank (8), the ballasted flocculation reaction tank (9), the inclined plate sedimentation tank (11) and the ultrafiltration tank (12) into a hydrocyclone (28) through a sludge discharge pipe (10) by a sludge circulating pump (22) for separation, and recovering the ballasted.
2. The method for removing the trace antibiotics in the composite polluted surface water according to claim 1, wherein a water outlet pipe (29) is installed above the ultra-filter (12), and the water outlet pipe (29) is respectively connected with a vacuum meter (27) and a suction pump (21).
3. The method for removing the trace antibiotics in the composite polluted surface water as claimed in claim 1, wherein the bubbler (23) is connected with an air compressor (25) through an aeration pipeline (26).
4. The method for removing the trace antibiotics in the composite polluted surface water according to the claim 1, wherein the water after the ultrafiltration in the ultrafiltration pool (12) in the step (five) is discharged out of the whole reactor, and the water in the ultrafiltration pool (12) is discharged out of the reactor through the suction action of a suction pump (21); when water enters the ultra-filtration tank (12), air is pumped into the water through an air compressor (25) and aerated through a bubbler (23), and the attachment on the surface of the ultrafiltration membrane filaments is scrubbed by using the air shearing action.
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