CN110921930A - Water treatment system for controlling ultrafiltration membrane pollution by catalyzing hydrogen persulfate through ultraviolet-coupled ferrous ions and application of water treatment system - Google Patents
Water treatment system for controlling ultrafiltration membrane pollution by catalyzing hydrogen persulfate through ultraviolet-coupled ferrous ions and application of water treatment system Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 132
- 239000012528 membrane Substances 0.000 title claims abstract description 78
- 238000000108 ultra-filtration Methods 0.000 title claims abstract description 56
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 title claims abstract description 48
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 title claims abstract description 39
- 229910001448 ferrous ion Inorganic materials 0.000 title claims abstract description 36
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 24
- 239000001257 hydrogen Substances 0.000 title claims abstract description 24
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 40
- 230000003647 oxidation Effects 0.000 claims abstract description 39
- 238000004062 sedimentation Methods 0.000 claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 19
- 238000005345 coagulation Methods 0.000 claims abstract description 17
- 230000015271 coagulation Effects 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 29
- 239000000243 solution Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 229920002301 cellulose acetate Polymers 0.000 claims description 6
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000007865 diluting Methods 0.000 claims description 4
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- -1 polyethylenes Polymers 0.000 claims description 4
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- 239000004698 Polyethylene Substances 0.000 claims description 3
- 150000001242 acetic acid derivatives Chemical class 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 3
- 239000011790 ferrous sulphate Substances 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- 125000005385 peroxodisulfate group Chemical group 0.000 claims description 3
- 229920002492 poly(sulfone) Polymers 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 2
- LFINSDKRYHNMRB-UHFFFAOYSA-N diazanium;oxido sulfate Chemical compound [NH4+].[NH4+].[O-]OS([O-])(=O)=O LFINSDKRYHNMRB-UHFFFAOYSA-N 0.000 claims description 2
- JZBWUTVDIDNCMW-UHFFFAOYSA-L dipotassium;oxido sulfate Chemical compound [K+].[K+].[O-]OS([O-])(=O)=O JZBWUTVDIDNCMW-UHFFFAOYSA-L 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- YMGGAHMANIOXGP-UHFFFAOYSA-L disodium;oxido sulfate Chemical compound [Na+].[Na+].[O-]OS([O-])(=O)=O YMGGAHMANIOXGP-UHFFFAOYSA-L 0.000 claims description 2
- 229960002089 ferrous chloride Drugs 0.000 claims description 2
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 2
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 239000003651 drinking water Substances 0.000 abstract description 3
- 235000020188 drinking water Nutrition 0.000 abstract description 3
- 230000004907 flux Effects 0.000 abstract description 3
- 150000002500 ions Chemical class 0.000 abstract description 2
- 238000005374 membrane filtration Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 7
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- 238000005516 engineering process Methods 0.000 description 5
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000001112 coagulating effect Effects 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 101100352902 Dictyostelium discoideum canA gene Proteins 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- FLTRNWIFKITPIO-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe] FLTRNWIFKITPIO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000009285 membrane fouling Methods 0.000 description 1
- 101150033714 mtcA1 gene Proteins 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- HDMGAZBPFLDBCX-UHFFFAOYSA-M potassium;sulfooxy sulfate Chemical compound [K+].OS(=O)(=O)OOS([O-])(=O)=O HDMGAZBPFLDBCX-UHFFFAOYSA-M 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 238000002604 ultrasonography Methods 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/44—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
-
- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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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
- C02F2001/007—Processes including a sedimentation step
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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
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/11—Turbidity
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/21—Dissolved organic carbon [DOC]
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Physical Water Treatments (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a water treatment system for controlling ultrafiltration membrane pollution by catalyzing hydrogen persulfate through ultraviolet coupled ferrous ions and application thereof, wherein the system comprises a hydrogen persulfate adding device, a ferrous ion adding device, a raw water pipeline, an ultraviolet light emitting device, an advanced oxidation coagulation contact tank, a stirring device, a sedimentation tank and an ultrafiltration membrane device; advanced oxidation-coagulating sedimentation pretreatment and an ultrafiltration process are combined to ensure the safety of drinking water, and the characteristics of organic matters and inorganic matters in water are changed through a pretreatment mode to control the pollution of an ultrafiltration membrane. The system has simple structure, simple and convenient operation and low treatment cost, and can treat Fe2+Ions and PMS are utilized to the maximum extent, and meanwhile, the water quality of drinking water is improved, the pollution of an ultrafiltration membrane is relieved, and the membrane filtration flux is improved.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a water treatment system for controlling ultrafiltration membrane pollution by catalyzing hydrogen persulfate through ultraviolet coupled ferrous ions and application thereof.
Background
The ultrafiltration membrane has rich microporous structures, so that certain high molecular organic colloids, particles, bacteria and the like in the water body can be effectively separated, and the water solution can permeate the ultrafiltration membrane, so that the aim of purifying water can be fulfilled. However, in the practical application process, membrane pollution is inevitable, the operation efficiency of the ultrafiltration membrane system is reduced to a great extent, the service life of the membrane component is shortened, and the operation cost is increased, so that the large-scale application and popularization of the ultrafiltration technology are severely restricted. Therefore, controlling membrane fouling is one of the key technologies to ensure stable operation of ultrafiltration systems and to extend the service life of membranes.
The main reasons for membrane pollution are that Natural Organic Matter (NOM) intercepted in the filtration process blocks membrane pores and forms an organic gel and filter cake layer on the membrane surface, so that the water permeability of the membrane is reduced and the pressure difference of the membrane is increased. According to the literature report, the pretreatment before filtration is one of the most effective technologies for degrading NOM in water, and the common pretreatment before filtration is a coagulating sedimentation method, an adsorption method, a separation method and an advanced oxidation method. In recent years, advanced oxidative pretreatment techniques involving a peroxodisulfate salt have been increasingly emphasized. The peroxydisulfate is easily activated by light, heat, ultrasound, transition metal and the like to generate hydroxyl radical (OH: E) with stronger oxidation group01.89-2.72V) and sulfate radical with stronger oxidizing property(s) ((C)
E02.5-3.1V), and the free radicals can directly mineralize and oxidize natural organic matters in water.Under the UV irradiation, the activated rate of the PMS is low, the rate and the number of generated free radicals are low, so that the pretreatment time is long, the PMS cannot be fully utilized, and the effect of removing organic matters is not ideal; when raw water is treated, the raw water has high turbidity and high inorganic pollution, and the turbidity and the inorganic pollution can hardly be removed by ultraviolet catalytic hydrogen persulfate (UV/PMS). It is reported that Fe2+The catalytic rate of PMS is very high, most of PMS completes the oxidative degradation reaction within 10min, but Fe is generated in the reaction process2+Will be associated with
React to cause Fe2+And
fe consumed thereby participating in the reaction of oxidative degradation of NOM2+And
the utilization rate is not high. Accordingly, when such advanced oxidation pretreatment technology is used, it is necessary to establish a method capable of rapidly generating free radicals to degrade NOM in water and also increasing Fe2+PMS and
the method of utilization is particularly important.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the technical problem, the invention provides a water treatment system for controlling ultrafiltration membrane pollution by catalyzing hydrogen persulfate through ultraviolet-coupled ferrous ions and application thereof.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme:
a water treatment system for controlling ultrafiltration membrane pollution by catalyzing hydrogen persulfate through ultraviolet-coupled ferrous ions comprises a hydrogen persulfate adding device, a ferrous ion adding device, a raw water pipeline, an ultraviolet light emitting device, an advanced oxidation coagulation contact tank, a stirring device, a sedimentation tank and an ultrafiltration membrane device; the persulfate throwing device and the ferrous ion throwing device are communicated with a water inlet of the advanced oxidation pond, a water outlet of the advanced oxidation coagulation contact pond is connected with a water inlet of the sedimentation pond, a water outlet of the sedimentation pond is connected with a water inlet of the ultrafiltration membrane device, the ultraviolet light emitting device and the stirring device are arranged inside the advanced oxidation coagulation contact pond, and the ultrafiltration membrane is arranged inside the ultrafiltration membrane device.
Preferably, the method comprises the following steps:
and the water outlets of the persulfate adding device and the ferrous ion adding device are respectively communicated with the water outlet of the advanced oxidation pond through a raw water pipeline or are directly connected with the water inlet of the advanced oxidation pond.
The water inlet of the advanced oxidation pond is positioned on the side wall close to the top, and the water outlet of the advanced oxidation pond is positioned on the side wall close to the bottom; the ultraviolet light emitting device is vertically arranged inside the advanced oxidation tank and can be completely or partially immersed in liquid in the tank; the stirring device is arranged on the inner bottom surface of the advanced oxidation pond.
The water inlet of the sedimentation tank is positioned on the side wall close to the bottom, and the water outlet is positioned on the side wall close to the top.
The ultrafiltration membrane divides the interior of the ultrafiltration membrane device into a water inlet space and a water outlet space, a water inlet of the ultrafiltration membrane device is communicated with the water inlet space, a water outlet of the ultrafiltration membrane device is communicated with the water outlet space, and liquid is discharged from the water outlet under the action of negative pressure suction or positive pressure.
The ultrafiltration membrane is a hollow fiber membrane or a flat ultrafiltration membrane, and the membrane material is selected from cellulose acetate, cellulose acetate esters, polyethylene, polysulfone, polyamide or inorganic ceramic membrane.
The method for treating water by using the water treatment system comprises the following steps:
1) switching on the power supply of the ultraviolet light emitting device, preheating and stably outputting;
2) respectively diluting hydrogen persulfate and ferrous salt in a hydrogen persulfate adding device and a ferrous ion adding device;
3) introducing raw water into a raw water pipeline, and simultaneously conveying a persulfate solution and a ferrite solution in a persulfate feeding device and a ferrite feeding device into an advanced oxidation coagulation contact pool;
4) starting a stirring device to fully contact and react;
5) conveying the water solution pretreated by the advanced oxidation coagulation contact tank into a sedimentation tank for static sedimentation, conveying the supernatant into an ultrafiltration membrane device for filtration treatment, and finally discharging the treated water from a water outlet of the ultrafiltration membrane device.
Preferably, the method comprises the following steps:
in the step 1), the transmitting power of the ultraviolet light emitting device (4) is 5-500W, the wavelength range is 100-400 nm, and preheating is carried out for 10-30 min.
In the step 2), the ferrous ions are selected from one or a mixture of more of ferrous sulfate and ferrous chloride; the peroxodisulfate is one or a mixture of sodium peroxomonosulfate, potassium peroxomonosulfate and ammonium peroxomonosulfate;
the molar ratio of ferrous ions to the peroxydisulfate added into the raw water in the step 3) is kept at 1 (2-6), and the adding amount of the ferrous ions is 50-200 mu M.
Starting a stirring device (6) in the step 4), and quickly stirring for 1-2 min at 200-400 r/min; then stirring at a low speed of 20-60 r/min for 30-90 min;
and (5) standing and precipitating for 10-30 min.
The main principle of the method for treating water by using the water treatment system is that PMS is under UV and Fe2+Under activation, OH and
degrading NOM in raw water to relieve irreversible pollution of ultrafiltration membrane, organic-inorganic synergistic pollution and Fe generated by oxidation3+The turbidity of raw water is reduced under the action of precipitation, and the irreversible pollution of the membrane is controlled.
Specifically, under the irradiation of ultraviolet light (UV) and the catalysis of ferrous ions, PMS is activated to generate
OH can effectively degrade organic matters in water, so that organic pollution and organic-inorganic synergistic pollution on the surface of the membrane are controlled; furthermore, Fe under UV irradiation3+To Fe2+The circulation of (2) can improve the utilization efficiency of PMS and reduce Fe2+The amount of addition of (c). In the reaction of Fe3+The ions can play a role in coagulating sedimentation, so that the turbidity of raw water can be better reduced, and the inorganic pollution of the membrane can be controlled. The specific principle is as follows:
(1) UV irradiation and Fe2+All can catalyze PMS to generate OH and
the reaction formula is as follows:
(2)·OH、
and UV irradiation can mineralize or oxidize NOM in water, wherein OH and
mainly degrades NOM, and the process is as follows:
OH + NOM → organic decomposition products;
(3) if it isFe in the absence of UV radiation2+And free radicals can be mutually consumed, so that the catalytic efficiency is reduced, and the free radicals are consumed at the same time, so that the performance of oxidative degradation NOM is reduced, and the process is as follows:
Fe2++·OH→Fe3++OH-；
(4) fe in aqueous solution under UV irradiation3+Partially oriented to Fe2+The cyclic conversion is carried out, the catalytic efficiency of PMS is improved, the consumption of free radicals is reduced, the oxidative degradation performance of NOM is improved, and the recovery process is as follows:
(5) after the reaction is finished, Fe3+Through flocculation and the particulate matter in the water, floccule, macromolecular material etc. form the sediment, its precipitation process is:
Fe3++3OH-→Fe(OH)3↓
has the advantages that: compared with the prior art, the invention has the following advantages:
1. the invention belongs to a short process flow, and has the advantages of simple process, simple and convenient required device, easy installation, easy operation, simple and convenient maintenance and small occupied space.
2. The reagent adopted by the invention belongs to an environment-friendly substance, does not cause secondary pollution, and is convenient in the transportation and storage processes.
3. According to the invention, reagents can be fully utilized in the pretreatment process, the utilization rate of PMS can reach 100%, and ferrous ions can be recycled, so that the available value of the ferrous ions is fully exploited, the ferrous ions form renewable resource-saving type, and a resource-saving type technology is constructed.
4. The free radicals formed in the pretreatment process have high efficiency, and compared with the existing pretreatment mode containing PMS, the method reduces the self consumption, thereby improving the oxidative degradation capability of NOM.
5. The invention integrates oxidative degradation, precipitation and disinfection processes, overcomes the characteristic of single pretreatment function before filtration, greatly improves the water quality and relieves the pollution of the ultrafiltration membrane.
6. The invention can flexibly regulate and control or improve relevant parameters and processes of pretreatment according to the actual operation effect.
Drawings
FIG. 1 is a schematic structural diagram of a water treatment system for controlling ultrafiltration membrane pollution by ultraviolet-coupled ferrous ion catalysis of hydrogen persulfate.
Detailed Description
The invention will be better understood from the following examples.
Embodiment 1 the invention relates to a water treatment system for controlling ultrafiltration membrane pollution by catalyzing hydrogen persulfate through ultraviolet coupled ferrous ions
A water treatment system for controlling ultrafiltration membrane pollution by catalyzing hydrogen persulfate through ultraviolet coupled ferrous ions is shown in figure 1 and comprises a hydrogen persulfate adding device 1, a ferrous ion adding device 2, a raw water pipeline 3, an ultraviolet light emitting device 4, an advanced oxidation coagulation contact tank 5, a stirring device 6, a sedimentation tank 7 and an ultrafiltration membrane device 8; persulfate throws and adds the delivery port that device 1 and ferrous ion throw device 2 and raw water pipeline 3 all is linked together with advanced oxidation pond 5's water inlet, and advanced oxidation coagulation contact tank 5's delivery port is connected with sedimentation tank 7's water inlet, and sedimentation tank 7's delivery port is connected with ultrafiltration membrane device 8's water inlet, and advanced oxidation coagulation contact tank 5 is inside to be equipped with ultraviolet emission device 4 and agitating unit 6, and ultrafiltration membrane device 8 is inside to be equipped with milipore filter 9.
The water outlets of the persulfate adding device 1 and the ferrous ion adding device 2 are respectively communicated with the water outlet of the advanced oxidation pond 5 through a raw water pipeline 3 (in the connection mode of the embodiment), or are directly connected with the water inlet of the advanced oxidation pond 5.
The water inlet of the advanced oxidation pond 5 is positioned on the side wall close to the top, and the water outlet is positioned on the side wall close to the bottom; the ultraviolet light emitting device 4 is vertically arranged inside the advanced oxidation pond 5 and can be completely or partially immersed in liquid in the pond; the stirring device 6 is arranged on the inner bottom surface of the advanced oxidation pond 5.
The water inlet of the sedimentation tank 7 is positioned on the side wall close to the bottom, and the water outlet is positioned on the side wall close to the top.
The ultrafiltration membrane 9 divides the inside of the ultrafiltration membrane device 8 into a water inlet space and a water outlet space, a water inlet of the ultrafiltration membrane device 8 is communicated with the water inlet space, a water outlet is communicated with the water outlet space, and liquid is discharged from the water outlet under the action of negative pressure suction or positive pressure.
The ultrafiltration membrane 9 is a hollow fiber membrane or a flat ultrafiltration membrane, and the membrane material is selected from cellulose acetate, cellulose acetate esters, polyethylene, polysulfone, polyamide or inorganic ceramic membrane.
Example 2 Water treatment method Using Water treatment System of the present invention
The method for treating water by using the water treatment system comprises the following steps:
1) switching on the power supply of the ultraviolet light emitting device 4, preheating and stably outputting;
2) respectively diluting hydrogen persulfate and ferrous salt in a hydrogen persulfate adding device 1 and a ferrous ion adding device 2;
3) introducing raw water into a raw water pipeline 3, and simultaneously conveying the persulfate solution and the ferrite solution in the persulfate adding device 1 and the ferrite adding device 2 into an advanced oxidation coagulation contact pool 5;
4) starting the stirring device 6 to fully contact and react;
5) the water solution pretreated by the advanced oxidation coagulation contact tank 5 is conveyed into a sedimentation tank 7 for static sedimentation, the supernatant is conveyed into an ultrafiltration membrane device 8 for filtration treatment, and finally the treated water is discharged from a water outlet of the ultrafiltration membrane device.
The specific method comprises the following steps:
using river water as raw water, pH 7.11, water temperature 20.63 deg.C, turbidity 58.6NTU, UV254＝0.172cm-1，DOC＝5.63mg/L，Fe2+Less than 0.06 mg/L. The power of an experimental ultraviolet lamp is 10W, and the emission wavelength is 254 nm. The membrane component for the experiment is a completely immersed U-shaped ultrafiltration membrane component, the membrane material is a polyvinylidene fluoride (PVDF) hollow fiber membrane, the membrane aperture is 0.02 mu m, the diameter of the ultrafiltration membrane filament is 2mm, and the effective area of the membrane component is about 0.024m2. Firstly, the power supply of the ultraviolet emission device 4 is switched on, so that the ultraviolet lamp is preheated for 20 min. Secondly, diluting the ferrous sulfate and the potassium hydrogen persulfate into a ferrous ion adding device 1 and a hydrogen persulfate adding device 2 by using ultrapure water respectively. Respectively opening an upper water inlet valve of a raw water pipeline 3, a water outlet valve of a ferrous ion adding device 1 and a water outlet valve of a hydrogen persulfate adding device 2, and enabling the Fe in the advanced oxidation coagulation contact tank 5 to be in contact with the Fe according to a certain flow ratio2+And
the concentrations were maintained at 80. mu.M and 400. mu.M, respectively. Starting a magnetic stirrer (a stirring device 6), and quickly stirring for 1 minute at 200r/min to fully mix; then stirring at 40r/min for 59min, after the full reaction is completed, pumping the liquid to a sedimentation tank 7 by a peristaltic pump, standing and settling for 20 min. Finally, the supernatant in the sedimentation tank 7 is extracted into the container of the ultrafiltration membrane device 8, and after the container is filled with the supernatant, the supernatant is extracted by 35L m-2h-1And carrying out a negative pressure suction filtration experiment at constant flux, and automatically recording transmembrane pressure difference (delta TMP), the volume of the filtered water body and the filtering time by using a transmembrane pressure difference instrument. After the experiment is finished, the experimental detection and related data calculation results for the water sample and the ultrafiltration membrane filtration are shown in the following table: the experimental results are as follows:
by the result canAs can be seen, ferrous ions catalyze hydrogen persulfate (UV/Fe) via UV coupling2+PMS) has great reduction on NOM and turbidity in drinking water after pretreatment of raw water, improves the permeation flux of the ultrafiltration membrane, and has good membrane pollution reduction effect.
Claims (10)
1. The water treatment system for controlling ultrafiltration membrane pollution by catalyzing hydrogen persulfate through ultraviolet coupled ferrous ions is characterized by comprising a hydrogen persulfate adding device (1), a ferrous ion adding device (2), a raw water pipeline (3), an ultraviolet light emitting device (4), an advanced oxidation coagulation contact tank (5), a stirring device (6), a sedimentation tank (7) and an ultrafiltration membrane device (8); persulfate throws and adds the delivery port that device (1) and ferrous ion thrown device (2) and raw water pipeline (3) and all is linked together with the water inlet of advanced oxidation pond (5), and the delivery port of advanced oxidation coagulation contact pond (5) is connected with the water inlet of sedimentation tank (7), and the delivery port of sedimentation tank (7) is connected with the water inlet of milipore filter device (8), and advanced oxidation coagulation contact pond (5) inside is equipped with ultraviolet emission device (4) and agitating unit (6), and milipore filter device (8) inside is equipped with milipore filter (9).
2. The water treatment system according to claim 1, wherein the water outlets of the persulfate adding device (1) and the ferrous ion adding device (2) are respectively communicated with the water outlet of the advanced oxidation pond (5) through a raw water pipeline (3), or are directly connected with the water inlet of the advanced oxidation pond (5).
3. The water treatment system according to claim 1, wherein the water inlet of the advanced oxidation basin (5) is located on the side wall near the top, and the water outlet is located on the side wall near the bottom; the ultraviolet light emitting device (4) is vertically arranged inside the advanced oxidation pond (5) and can be completely or partially immersed in liquid in the pond; the stirring device (6) is arranged on the inner bottom surface of the advanced oxidation pond (5).
4. A water treatment system according to claim 1, characterized in that the inlet of the sedimentation tank (7) is located in the side wall near the bottom and the outlet is located in the side wall near the top.
5. A water treatment system according to claim 1, characterized in that the ultrafiltration membrane (9) divides the inside of the ultrafiltration membrane device (8) into a water inlet space and a water outlet space, the water inlet of the ultrafiltration membrane device (8) is communicated with the water inlet space and the water outlet is communicated with the water outlet space, and liquid is discharged from the water outlet under the action of negative pressure suction or positive pressure.
6. The water treatment system according to claim 1, wherein the ultrafiltration membrane (9) is a hollow fiber membrane or a flat plate ultrafiltration membrane, and the membrane material is selected from cellulose acetate, cellulose acetate esters, polyethylenes, polysulfones, polyamides or inorganic ceramic membranes.
7. A method of treating water using the water treatment system of any one of claims 1-6, comprising the steps of:
1) switching on the power supply of the ultraviolet light emitting device (4), preheating and stably outputting;
2) respectively diluting hydrogen persulfate and ferrous salt in a hydrogen persulfate adding device (1) and a ferrous ion adding device (2);
3) introducing raw water into a raw water pipeline (3), and simultaneously conveying a persulfate solution and a ferrite solution in a persulfate adding device (1) and a ferrous ion adding device (2) into a high-grade oxidation coagulation contact pool (5);
4) starting the stirring device (6) to fully contact and react;
5) conveying the aqueous solution pretreated by the advanced oxidation coagulation contact tank (5) into a sedimentation tank (7) for static sedimentation, conveying the supernatant into an ultrafiltration membrane device (8) for filtration treatment, and finally discharging the treated water from a water outlet of the ultrafiltration membrane device.
8. The method according to claim 7, wherein the ultraviolet light emitting device (4) in step 1) emits 5-500W of light, has a wavelength of 100-400 nm, and is preheated for 10-30 min.
9. The method according to claim 7, wherein the ferrous ions in step 2) are selected from one or more of ferrous sulfate and ferrous chloride; the peroxodisulfate is one or a mixture of sodium peroxomonosulfate, potassium peroxomonosulfate and ammonium peroxomonosulfate; the molar ratio of ferrous ions to the peroxydisulfate added into the raw water in the step 3) is kept at 1 (2-6), and the adding amount of the ferrous ions is 50-200 mu M.
10. The method as claimed in claim 7, wherein in step 4), the stirring device (6) is started, and the mixture is rapidly stirred for 1-2 min at 200-400 r/min; then stirring at a low speed of 20-60 r/min for 30-90 min; and (5) standing and precipitating for 10-30 min.
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