CN110627170A - Defluorination device without concentrated water discharge - Google Patents

Defluorination device without concentrated water discharge Download PDF

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Publication number
CN110627170A
CN110627170A CN201910952133.1A CN201910952133A CN110627170A CN 110627170 A CN110627170 A CN 110627170A CN 201910952133 A CN201910952133 A CN 201910952133A CN 110627170 A CN110627170 A CN 110627170A
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water
electro
adsorption
reactor
water outlet
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CN201910952133.1A
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CN110627170B (en
Inventor
张海丰
鲁斌
王胜利
关晓辉
孙旭辉
张兰河
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Northeast Electric Power University
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Northeast Dianli University
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104Devices therefor; Their operating or servicing
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/463Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/12Halogens or halogen-containing compounds
    • C02F2101/14Fluorine or fluorine-containing compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00Apparatus for treatment of water, waste water or sewage
    • C02F2201/002Construction details of the apparatus
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00Apparatus for treatment of water, waste water or sewage
    • C02F2201/46Apparatus for electrochemical processes
    • C02F2201/461Electrolysis apparatus
    • C02F2201/46105Details relating to the electrolytic devices
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/14Maintenance of water treatment installations

Abstract

The invention discloses a defluorination device without concentrated water discharge, which consists of two parts of defluorination and automatic control. The structure is as follows: the raw water tank is connected with a water inlet pump, an outlet of the raw water tank is connected with a water inlet of the electro-adsorption reactor, the parallel electrode plates are respectively connected with positive and negative electrode clamping grooves of the electro-adsorption reactor, and the clamping grooves are connected with an electro-adsorption direct-current power supply through electric wires. The water outlet of the electro-adsorption reactor is connected to the water inlet of the water outlet converter, and the purified water outlet of the converter is connected to the water outlet tank. The concentrated discharge port of the converter is connected with the water inlet of the electric flocculation reactor. The electric flocculation reactor is provided with a stirring area and a settling area, the upper part of the settling area is provided with a water outlet, and the lower part of the settling area is provided with a sludge discharge port. The output signal of the time relay is transmitted into the pole inverter, and the water converter, the stirrer and the electrocoagulation DC power supply are controlled to operate or stop. The device combines the electric adsorption and electric flocculation technologies, solves the problem of concentrated water treatment in the electric adsorption regeneration process, has high fluorine ion removal efficiency, and can ensure that the effluent can reach the drinking water quality standard.

Description

Defluorination device without concentrated water discharge
Technical Field
The invention belongs to the water treatment technology, and particularly relates to a fluorine-containing non-metal ion treatment device in water.
Background
The lack and the excess of fluorine in drinking water can cause harm to the health of human bodies, and the influence of high-fluorine underground water on human is very common. Statistically, more than 2 hundred million people worldwide drink excessive fluorine-containing water for a long time; when the fluorine content in the drinking water is higher than 1.0mg/L, dental fluorosis, fluoroossoma and the like can be caused after long-term drinking; long-term drinking of water with fluorine concentration higher than 6.0mg/L can cause severe fluorosis. In recent years, the harm of fluorine pollution of underground water in China to human health gradually draws wide attention of people, and the development of efficient and reliable fluorine ion removal devices is urgent.
At present, the commonly used method for treating fluorinion in water at home and abroad mainly comprises the following steps: (1) a precipitation method: lime is utilized to form calcium fluoride precipitate to remove fluoride ions in water, and the problem exists that the concentration of fluoride ions in the effluent is generally more than 15mg/L, so that the process is not suitable for drinking water treatment; (2) a coagulation method: the ferric salt and the aluminum salt are utilized for coagulation to remove the fluorinion, and the defects are that the method is suitable for treating high-concentration fluorine-containing wastewater and has poor effect of removing raw water with low fluorinion content; (3) an adsorption method: the purpose of removing fluorine is achieved by adsorbing fluorine ions on the surface of a carrier by using an adsorbent, and the defects are that the adsorbent is difficult to regenerate and has poor repeated use effect; (4) a reverse osmosis method: the reverse osmosis membrane is used for separating out the fluoride ions, and the defect is that a complex pretreatment process is required, so that the method is suitable for preparing ultrapure water.
Recently, an electro-adsorption technology (also called a capacitive desalination technology) developed based on an electric double layer desalination theory is receiving increasing attention, and under the action of a direct current electric field, positive and negative ions in raw water respectively migrate to a positive stage and a negative stage, and are adsorbed on a polar plate to be removed. The technology has the obvious advantages that the fluoride ion removal efficiency is high, and the fluoride ion removal of the underground water can reach the fluoride standard (less than or equal to 1.0mg/L) specified in the sanitary Standard for Water for Life citation (GB5749-2006) in China. However, the biggest problem of the process is that after the cathode and anode plates are adsorbed and saturated, a large amount of water is needed to flush the surfaces of the anode and cathode plates, so that a large amount of drainage containing high-concentration fluorine ions is generated. Therefore, how to solve the problem of concentration discharge in the process of removing fluorine, especially developing a fluorine removal device without concentration discharge is the key to solve the harm of the fluorine ions in the drinking water at present.
The invention provides a device for efficiently removing low-concentration fluorine ions in water, which combines the electric adsorption and the electric flocculation technology to obtain satisfactory water production effect at lower cost.
Disclosure of Invention
The invention aims to provide a defluorination device without concentrated water discharge, and an electro-adsorption and electro-flocculation process is coupled.
To achieve this object, a fluorine removal device without discharging concentrated water includes: the system comprises a raw water tank, a water inlet pump, an electro-adsorption reactor, a water outlet converter, an electro-adsorption direct-current power supply, an electro-flocculation reactor, a water outlet tank, a stirrer, a time relay, an electrode inverter, an electro-flocculation direct-current power supply and the like. The technical scheme adopted by the invention is as follows: the defluorination device consists of a defluorination system and an automatic control system. The defluorination system consists of a raw water tank, a water inlet pump, an electro-adsorption reactor, an electro-adsorption direct-current power supply, an electro-flocculation reactor and a water outlet tank; the automatic control system consists of a water outlet converter, a stirrer, a time relay, an electrode inverter and an electro-adsorption direct-current power supply. The raw water tank is connected with a water inlet pump, the outlet of the water inlet pump is connected to the water inlet of the electro-adsorption reactor, the stainless steel parallel electrode plates are respectively connected with the positive clamping groove and the negative clamping groove in the electro-adsorption reactor, and the positive clamping groove and the negative clamping groove are connected with an electro-adsorption direct-current power supply through electric wires. The water outlet of the electro-adsorption reactor is connected with the water inlet of the water outlet converter, and the purified water outlet of the water outlet converter is connected to the water outlet tank; the concentrated discharge port of the water outlet converter is connected with the water inlet of the electric flocculation reactor; the anode of the electric flocculation reactor is connected with an anode bus, and the cathode is connected with a cathode bus. The electric flocculation reactor is provided with a stirring area and a settling area, the stirring area is provided with a stirrer, the upper part of the settling area is provided with a water outlet, the lower part of the settling area is provided with a sludge discharge port, and the water outlet is connected with a raw water tank. The output signal of the time relay is transmitted into the pole inverter, and the water converter, the stirrer and the electric flocculation direct current power supply are controlled to work or stop.
When the raw water passes through the positive and negative electrode plates, anions in the water migrate to the positive electrode plate and are adsorbed on the positive electrode plate, cations migrate to the negative electrode and are adsorbed on the electrode plate, and fluorine ions in the raw water are removed. When the positive and negative plates are saturated, the reverse operation is realized through the reverse device, so that the regeneration of the plates is realized, the concentrated water is concentrated and discharged through the water outlet converter and enters the electric flocculation reactor, after electric flocculation, stirring and precipitation, the treated water is discharged into the original water tank, and the precipitated floc is discharged through the sludge discharge port.
The defluorination device without concentrated water discharge combines the electric adsorption and electric flocculation technology, solves the concentrated water treatment problem generated in the electric adsorption regeneration process, and is characterized in that: under the action of an external direct current electric field, the positive electrode of the electric adsorption adsorbs anions, the negative electrode adsorbs cations, and fluorine ions are removed; when the adsorption is saturated, the regeneration of the positive and negative plates is realized through the reverse operation, the concentrated water enters the electric flocculation reactor for treatment, and the treated water enters the raw water tank.
The invention has the characteristics and beneficial effects that (1) the efficiency of removing fluorinion by electro-adsorption is high, and the effluent can reach the water quality standard of drinking water; (2) concentrated water generated in the process of electro-adsorption regeneration can be reused in a water inlet tank after being treated by the electro-flocculation device, so that the problem of concentrated discharge is solved; (3) the combined treatment technology solves the treatment problem of low-fluorine raw water and high-fluorine concentrated discharge.
Drawings
FIG. 1 is a schematic diagram of the principles and connections of the components of the system of the present invention.
Solid lines in the figure represent equipment connection lines; the dashed lines represent electrical wires or control signal lines.
Detailed Description
The structural components of the present invention are further described by way of examples with reference to the accompanying drawings.
The defluorination device without concentrated water discharge consists of a defluorination system and an automatic control system, wherein the defluorination system consists of a raw water tank, a water inlet pump, an electro-adsorption reactor, an electro-adsorption direct-current power supply, an electro-flocculation reactor and a water outlet tank; the automatic control system consists of a water outlet converter, a stirrer, a time relay, an electrode inverter and an electro-adsorption direct-current power supply. The raw water tank 1 is connected with a water inlet pump 2, the outlet of the water inlet pump is connected to a water inlet 3-1 of an electro-adsorption reactor 3, and a plurality of stainless steel parallel electrode plates are respectively connected with a positive clamping groove 3-2 and a negative clamping groove 3-3 in the electro-adsorption reactor.
The electro-adsorption reactor is a box body, and stainless steel parallel electrode plates are arranged in the electro-adsorption reactor, and the number of the electrode plates is determined according to the load of treatment (water). The water inlet of the electro-adsorption reactor is arranged at the upper part of the box body, the water outlet is arranged at the lower part, and the water outlet is connected to the water outlet converter.
The positive and negative electrode clamping grooves are connected with an electro-adsorption direct current power supply 3-4 through electric wires. The water outlets 3-5 of the electro-adsorption reactor are connected with the water inlet of the water outlet converter 4, and the purified water outlet of the water outlet converter is connected to the water outlet tank 5. Namely: the water outlet converter is provided with three interfaces: the lower one is connected with the electro-adsorption reactor; the top and the bottom are respectively connected with the electric flocculation reactor and the water outlet tank, and the top is provided with a pus discharge port. The concentrated discharge port of the water outlet converter is connected with the water inlet of the electric flocculation reactor 6. The electric flocculation reactor is also a box structure and is provided with three areas, wherein the anode of the electric flocculation reactor (of the electrode area) is connected with an anode bus 7-1, and the cathode is connected with a cathode bus 7-2. The electric flocculation reactor is also provided with a stirring area 6-1 and a settling area 6-2, the stirring area is provided with a stirrer 8, the upper part of the settling area is provided with a water outlet, the lower part of the settling area is provided with a sludge discharge port, and the water outlet is connected with a raw water tank.
An automatic control system: the output signal of the time relay 9 is transmitted into the inverter 10, and the water converter, the stirrer and the electric flocculation direct current power supply 11 are controlled to work or stop.
The distance between the positive plate and the negative plate in the electro-adsorption reactor is 0.5mm, and the voltage output by the electro-adsorption direct current power supply is 1.2V.
The distance between the cathode plate and the anode plate of the electrocoagulation reactor is 1.0cm, the mechanical stirring strength is 60r/min, and the voltage output by the electrocoagulation direct-current power supply is 0.8V; the time relay controls the reverse stage time to be 90 min.
The electric flocculation anode is an aluminum plate; the cathode is a stainless steel plate.
The system device fully considers the characteristic of discontinuous water production of the electro-adsorption process, uses a time relay to carry out centralized control on the pole inverter and the water outlet converter, and simultaneously controls the work or the stop of the electro-flocculation reactor.
The raw water of the embodiment is groundwater in a certain city of Jilin province, the conductivity is 240-; parameters of the electro-adsorption reactor: the distance between the positive stainless steel plate and the negative stainless steel plate is 0.5mm, and the voltage output by the electro-adsorption direct-current power supply is 1.2V; parameters of the electrocoagulation reactor: the distance between the aluminum anode and the stainless steel cathode is 1.0cm, the mechanical stirring strength is 60r/min, and the voltage output by the electric coagulation direct current power supply is 0.8V; the time relay controls the pole reversing time to be 90 min.
The experimental running results show that: the raw water recovery rate is nearly 100 percent, the purified water conductivity is less than or equal to 14 mu S/cm, the fluorine ions are less than or equal to 0.7mg/L, and the effluent of the device completely meets the standards of sanitary Standard for Water for Life citation (GB 5749-2006).

Claims (4)

1. Defluorination device that no dense water discharged, including former water tank, intake pump, electro-adsorption reactor, play water converter, electro-adsorption DC power supply, electric flocculation reactor, play water tank, agitator, time relay, fall utmost point ware and electric flocculation DC power supply, its characterized in that: the defluorination device consists of a defluorination system and an automatic control system, wherein the defluorination system consists of a raw water tank, a water inlet pump, an electro-adsorption reactor, an electro-adsorption direct-current power supply, an electro-flocculation reactor and a water outlet tank; the automatic control system consists of a water outlet converter, a stirrer, a time relay, an electrode reversing device and an electro-adsorption direct-current power supply, wherein a raw water tank (1) is connected with a water inlet pump (2), the outlet of the water inlet pump is connected to a water inlet (3-1) of an electro-adsorption reactor (3), a plurality of stainless steel parallel electrode plates are respectively connected with an anode clamping groove (3-2) and a cathode clamping groove (3-3) in the electro-adsorption reactor, and the anode clamping groove and the cathode clamping groove are connected with the electro-adsorption direct-current power supply (3-4) through electric wires; the water outlet (3-5) of the electro-adsorption reactor is connected with the water inlet of the water outlet converter (4), and the purified water outlet of the water outlet converter is connected to the water outlet tank (5); the concentrated discharge port of the water outlet converter is connected with the water inlet of an electric flocculation reactor (6), the anode of the electric flocculation reactor is connected with an anode bus (7-1), the cathode of the electric flocculation reactor is connected with a cathode bus (7-2), the electric flocculation reactor is provided with a stirring area (6-1) and a settling area (6-2), the stirring area is provided with a stirrer (8), the upper part of the settling area is provided with a water outlet, the lower part of the settling area is provided with a sludge discharge port, and the water outlet is connected with a raw water tank; the output signal of the time relay (9) is transmitted into the pole inverter (10) and controls the water converter, the stirrer and the electric flocculation direct current power supply (11) to work or stop.
2. The fluorine removing device without discharging concentrated water according to claim 1, wherein: the distance between the positive plate and the negative plate in the electro-adsorption reactor is 0.5mm, and the voltage output by the electro-adsorption direct-current power supply is 1.2V.
3. The fluorine removing device without discharging concentrated water according to claim 1, wherein: the distance between the cathode plate and the anode plate of the electrocoagulation reactor is 1.0cm, the mechanical stirring strength is 60r/min, and the voltage output by the electrocoagulation direct-current power supply is 0.8V; the time relay controls the pole reversing time to be 90 min.
4. The fluorine removing device without discharging concentrated water according to claim 1, wherein: the electric flocculation anode is an aluminum plate; the cathode is a stainless steel plate.
CN201910952133.1A 2019-10-09 2019-10-09 Defluorination device without concentrated water discharge Active CN110627170B (en)

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