CN107746117B - Electrochemical water quality stabilizing and purifying method and device - Google Patents

Electrochemical water quality stabilizing and purifying method and device Download PDF

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CN107746117B
CN107746117B CN201711216268.9A CN201711216268A CN107746117B CN 107746117 B CN107746117 B CN 107746117B CN 201711216268 A CN201711216268 A CN 201711216268A CN 107746117 B CN107746117 B CN 107746117B
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water quality
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CN107746117A (en
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马伟
吴磊
郭丽燕
陈振
孟凡庆
王刃
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Dalian University of Technology
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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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/4602—Treatment of water, waste water, or sewage by electrochemical methods for prevention or elimination of deposits
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46133—Electrodes characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
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    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
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    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4612—Controlling or monitoring
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4612—Controlling or monitoring
    • C02F2201/46125—Electrical variables
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2307/00—Location of water treatment or water treatment device
    • C02F2307/14—Treatment of water in water supply networks, e.g. to prevent bacterial growth

Abstract

The invention discloses an electrochemical water quality stabilizing and purifying method and device, belonging to the technical field of water quality purification and water chemical stabilization treatment. The PLC control is used as a basis to automatically control the calculation, control and automatic alarm and adjustment of indexes related to water quality stability, such as scaling, corrosion, sterilization, pipeline sediment dissolution and the like. The device realizes reducing the hardness of water and the effect of algae removal of disinfecting simultaneously to use the desilting device to carry out the high efficiency to the incrustation scale and get rid of, this electrolytic device's power can use solar energy, reaches environmental protection and energy saving's purpose, and when applying in the industry, it is high to have degree of automation, can guarantee stable quality of water high-efficiently in real time, low cost easily promotes.

Description

Electrochemical water quality stabilizing and purifying method and device
Technical Field
The invention belongs to the technical field of water purification and water conservation, and relates to a method for electrolytically treating pipe network water. The method can adopt a control system device, a mud removing device and an asymmetric electrode with a chute and a bulge, can adjust water quality parameters such as turbidity, pH value, alkalinity, hardness and conductivity, has the characteristics of descaling, algae killing and corrosion prevention, and has an industrial application prospect.
Background
With the rapid development of the world economy, the global problems of water resource shortage and water pollution are more and more seriously faced by people. At present, in most water quality conveying processes and industrial cooling water processes, the problems of corrosion, scaling, precipitate dissolution, reproduction of bacteria, algae and the like occur. Particularly, the industrial cooling water adopts a circulating system, the industrial water generally accounts for 80 percent of the total water consumption, and 2/3 is the cooling water. To save water resources, the pollution discharge of a circulating cooling water system is reduced as much as possible, and the concentration ratio of cooling water is improved. Meanwhile, a reverse osmosis membrane is utilized to prepare desalted water to generate a large amount of high-salinity concentrated water, and the concentrated water can be recycled as circulating water. The cooling water is continuously circulated and concentrated when in use, the mineral content in the water is also continuously increased, and various substances are deposited on the surface of the heat exchanger to form deposits. Scaling, corrosion and microorganism breeding are three major problems faced by circulating water systems. At present, a common method for treating high-hardness water such as circulating cooling water and the like is to use a scale and corrosion inhibitor, but the use of chemical agents has the defects of repeated administration, difficult control of dosage and time, secondary pollution caused by discharge and the like.
In the existing literature, a patent of 'micro-electrolysis scale inhibition and sterilization treatment device' with publication number CN201169550Y mainly designs a micro-electrolysis device for sterilization and scale inhibition treatment of circulating water, and the device has the advantages of no need of adding any medicament, stable scale inhibition effect, no pollution and the like, but has the defects of high power consumption and high treatment cost. The invention patent with publication number CN101182056A, a method for removing algae by composite catalytic oxidation of tourmaline, refers to a method for sterilizing and removing algae by using modified tourmaline as filler and cooperating with micro-electrolysis. The method only performs algae-killing purification treatment on seawater, surface water and the like, and does not relate to purification treatment of circulating cooling water with high hardness, high alkalinity and high microbial pollution.
The paper documents also report the research on the treatment of circulating water by an electrolytic method, such as the experimental research on the micro-electrolysis for circulating cooling water published by Leyi philosophy, the delayed juan and the like in Industrial Water treatment (2006/02), and the systematic study on the scale inhibition, corrosion inhibition and sterilization effects of the micro-electrolysis method; "micro-electrolysis algae-killing research" published by Zhou-qun-ying et al in Shanghai environmental science (1998/01); a series of papers such as 'sterilization effect research of micro-electrolysis water treatment device' published by 'water supply and drainage' (2001//11) of Wangxuefeng et al mainly relate to the removal technology and theoretical research of dirt, algae and bacteria in water by micro-electrolysis. Although the methods mentioned in the above documents play a certain role in the treatment of circulating water, the methods do not consider the problems of electrode structure, water quality regulation and evaluation and control of water quality stability coefficient, and the application range is limited by the type of water quality. Therefore, the water quality chemical basic principle is needed, the water quality type is not only considered, and ions in water are finely adjusted by asymmetric electrodes and different electrolytes are introduced so as to enhance the water quality stabilization effect.
Disclosure of Invention
The invention provides a method and equipment for electrolyzing high-hardness circulating cooling water and reverse osmosis concentrated water, which simultaneously realize the effects of reducing water hardness, sterilizing and removing algae, and efficiently remove water scale by using a mud removing device.
The invention provides a control system device, a mud removing device and an asymmetric special-shaped electrode with a chute and a bulge for detecting and treating circulating water in real time according to the chemical properties of the circulating water, aiming at the problem that the circulating water of a pipe network is easy to scale and corrode and causes economic loss.
The water treatment method and the device provided by the invention not only can efficiently ensure the stable quality of the circulating water in real time and prevent the scaling and corrosion of a pipe network, but also have the application values of low price, environmental protection and energy saving.
The technical scheme of the invention is as follows:
an electrochemical water quality stabilizing and purifying device comprises a circulating water tank, electrodes, a pH sensor, a conductivity sensor, an alkalinity sensor, a calcium ion sensor, a bicarbonate radical sensor, a floating ball, a photoelectric sensor, a monochromatic light source and a microcontroller;
the circulating water tank is a reaction tank with an opening at the upper end, and a water inlet is formed in the circulating water tank and is connected with an external water inlet pipeline; the lower part of the circulating water tank is provided with a solid outlet and a water outlet, the solid outlet is used for periodically discharging precipitates generated by the reaction, and the water outlet is used for discharging treated water;
the electrodes are of a cathode and anode integrated structure, can exchange roles according to requirements and are a first electrode and a second electrode; the outer surfaces of the first electrode and the second electrode are provided with a chute and a bulge, the chute is provided with a through hole and is used for throwing and directionally conveying the medicament, and the bulge part is favorable for discharging and electrolyzing; the first electrode is sequentially wrapped with an ion exchange membrane and a ceramic membrane, and the second electrode surrounds the first electrode; changing the roles of the cathode and the anode according to the electrolysis requirement, and ensuring that the area ratio of the cathode to the anode is 10-5000: 1, adjusting the power supply voltage to make the current density be 0.1-1000mA/cm2；
The first electrode and the second electrode are made of composite conductive carbon-based materials, conductive plastics or conductive alloys and are in cylindrical or square solid or hollow structures.
The pH sensor, the conductivity sensor, the alkalinity sensor, the calcium ion sensor and the bicarbonate radical sensor are inserted into the water body of the circulating water tank, the detection is not influenced mutually, and the real-time monitoring of the pH, the conductivity, the alkalinity, the calcium ion concentration and the bicarbonate radical concentration is realized;
the floating ball is controlled by a switch, is fixed on the inner wall of the circulating water tank and is used for positioning the water inlet height;
the photoelectric sensor and the monochromatic light source are symmetrically arranged on the outer side of the circulating water tank and are matched with each other to measure the concentration of algae in the water body;
the electrodes, the pH sensor, the conductivity sensor, the alkalinity sensor and the photoelectric sensor are all connected to the microcontroller, and the microcontroller realizes real-time monitoring and control of all parts.
The microcontroller is a PLC and is assisted by a touch screen, a relay or a photoelectric coupler, a switch and an AD converter.
The power supply used in the electrochemical water quality stabilizing and purifying device can be provided by converting solar energy into electric energy.
The wavelength of the monochromatic light source is 300-1000 nm.
An electrochemical water quality stabilizing and purifying method comprises the following steps:
(1) the algae pollution level index WZI is compared to the set point:
determining the set value to be 1, setting the large-area electrode as an anode when the WZI value is greater than the set value of 1, setting the electrolytic voltage to be 0.1-60V, and introducing 0.01-2.5mol/L sodium chloride or potassium chloride into an anode chute to accelerate the separation of oxidizing substances into solution so as to effectively remove algae; when WZI is less than the set value 1, indicating that the algae removal is finished;
(2) after the WZI value is judged to be less than the set value 1 by the microprocessor, waiting for 1-20 minutes; detecting relevant parameters of the water body by a pH sensor, a conductivity sensor, an alkalinity sensor, a calcium ion sensor and a bicarbonate radical sensor; calculating a corrosion index WFI according to formulas (a), (b) and (c) to judge the corrosivity of the water quality;
pHj＝lg(Alk)+5.14； (a)
pHs＝pK2-pKs-lgc(Ca2+)-lg c(HCO3-)； (b)
WFI＝(2pHs-pHj)/6.6； (c)
in the formula: pH valuejIndicates the pH value when the dissolved alkaline matter is saturated, Alk indicates the alkalinity, and pHsRepresents the pH value of the calcium carbonate solution when the calcium carbonate solution is saturated; pK2Is the equilibrium constant of the second stage ionization of calcium carbonate; pKsIs the solubility product constant of calcium carbonate;
when WFI is less than 1, 0.01-2.5mol/L of sulfate, carbonate and phosphate solution is fed into the anode electrode chute, the mass ratio of the sulfate to the carbonate is adjusted to 0.1-100 according to the water quality condition, the mass ratio of the carbonate to the phosphate is adjusted to 0.1-100, and 0.01-2.5mol/L of sodium sulfate solution is fed into the cathode electrode chute; adjusting the pH value and the ion content until the WFI value is more than 1, and detecting the concentrations of calcium ions, sulfate ions and carbonate ions; calculating a scaling index WGI by judging the relation between the ratio t of the sulfate ion concentration to the carbonate ion concentration and 1000 according to system judgment selection formulas (d) and (e);
when t is>At 1000: WGI ═ (k × Ksp/[ Ca ]2+]m/[CO3 2-]m/8)-1 (d)
When t is less than or equal to 1000: WGI ═ (k × Ksp/[ Ca ]2+]m/[SO4 2-]m/8)-1 (e)
Wherein Ksp represents the ionic product constant of calcium carbonate; the k value is determined by the total TDS of the soluble solids in the water or determined according to a water quality specific test;
(1) when the TDS is not less than 5000, k is 7.2;
(2) when TDS is more than or equal to 3000 and less than or equal to 5000, k is 6.8;
(3) when TDS <3000, k is 6.4;
if WGI is more than or equal to 1, scaling is easy, a large area is adjusted to be a cathode, 0.01-1mol/L carbonate, bicarbonate or carbon dioxide is introduced into the chute, calcium, magnesium and other ions are removed, and the hardness in the solution is reduced; maintaining the voltage constant at 0.1-60V; and (4) regulating the hardness value to enable WGI to be less than 1, and continuing to detect the green alga content and the pH value in the water after the scaling index is stable.
The invention has the beneficial effects that: the device and the method can detect the water quality condition of the circulating water of the pipe network in real time, and can accurately dose according to the water quality condition, so that corrosion and scaling of the pipe network are prevented, and the device and the method have the application values of high efficiency, intelligence, energy conservation, environmental protection and low price.
Drawings
FIG. 1 is a descaling flow diagram.
Figure 2 is a block diagram of a circular electrode with a liquid chute.
Figure 3 is a block diagram of a square electrode with a liquid chute.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
Example 1
Taking a water sample, and measuring the pH value to be 8.15 and the hardness to be 600(mg/L CaCO)3) The conductivity was 1760. mu.S/cm. After the electrolytic treatment, the pH, hardness, algae removal rate and conductivity were measured.
The experimental conditions are as follows: adopting a cylindrical chute electrode and a 1 cm wide sheet to form an asymmetric electrode, wherein the volume of a water sample is 800mL, and the current density is 20mA/cm2The treatment time was 40min, and the results of the 60min test are shown in the following table.
Processing method pH Hardness (CaCO)3mg/L) Algae removal Rate (%) Conductivity (μ S/cm)
Processing t1 6.89 420 98 1530
Processing t2 7.12 400 100 1522
As can be seen from the above table, the increase in pH during the treatment period is beneficial to preventing corrosion, and increases the hardness and the removal rate of algae to some extent.
Example 2
Taking a circulating water sample, and measuring the pH value of the circulating water sample to be 8.15 and the hardness to be 600(mg/L CaCO)3) The conductivity was 1760. mu.S/cm. Carrying out electrolytic treatment under different current density conditions, and measuring pH, hardness, algae removal rate and conductivity after treatment. An asymmetric electrode is formed by a square chute electrode and a sheet with the width of 1 cm; the sodium sulfate solution was added to the chute at a rate of 0.05ml/min of 0.5 mol/l.
The experimental conditions are as follows: the volume of a water sample is 800mL, the treatment time is 60min, tourmaline is added as a filler, and the treatment effect is as follows:
Figure BDA0001485593660000061
Figure BDA0001485593660000071
from the above results, it can be seen that as the current density increases, the hardness and conductivity of the water sample are both continuously reduced, and the algae removal rate is continuously increased. When the current density reaches 10mA/cm2In the process, the addition of sodium sulfate is also beneficial to accelerating the algae removal efficiency, and the hardness and the conductivity of the water sample are also reduced to a moderate level.
Example 3
An asymmetric electrode consisting of a square chute electrode and a 1 cm wide sheet is adopted to take a high-hardness circulating water sample, and a direct-current power supply and a solar cell are respectively used as power supplies to carry out electrolytic treatment. The initial pH of the circulating water was 8.56 and the hardness was 1060(mg/L CaCO)3) The conductivity was 1721. mu.S/cm.
The experimental conditions are as follows: the volume of a water sample is 800mL, and the current density is 15mA/cm2The adding speed of 0.5mol/l is 0.01ml/min, the treatment time is 60min, and the treatment effect is as follows: an asymmetric electrode is formed by a cylindrical chute electrode and a sheet with the width of 1 cm, and the adding speed of 0.5mol/l is 0.05ml/min.
Figure BDA0001485593660000072
By comparison, it was found that the addition of a small amount of sodium carbonate promoted the reduction in hardness. Has little influence on algae removal and desalination.
Example 4
And taking high-salinity concentrated water generated when the reverse osmosis membrane is used for preparing desalted water as a water sample for treatment.
The experimental conditions are as follows: adopting a cylindrical chute electrodeAnd 1 cm wide sheet to form an asymmetric electrode, the volume of a water sample is 800mL, and the current density is 10mA/cm2Adding sodium bicarbonate with the addition amount of 0.5mol/l sodium bicarbonate solution at the rate of 0.01ml/min, treating for 60min, and treating for the following effects:
Figure BDA0001485593660000081
the method has better treatment effect on reverse osmosis concentrated water, and the treated water can be recycled as circulating water, thereby achieving the purpose of saving water.
Example 5
Dynamic test bypass water quality stabilization experimental conditions comprise that an anode inert electrode is 2.5cm wide and 75cm long, a cathode stainless steel electrode is 65cm in diameter and 80cm deep and is cylindrical with a liquid chute, sodium bicarbonate liquid is injected into the chute in a micro-amount, and the adding speed is controlled to be 0.1mol/L of 0.1 ml/min. The initial working voltage was 6V, the measured current was 0.233A, and 100L of simulated recirculated cooling water was micro-electrolyzed, and after static treatment for 22 hours, the experimental data are shown in the table below. WSI was obtained by experimental data analysis: 1.0-2.0, pH 6.8-7.5, not easy to scale, not corrosive and stable water quality; fresh water can be supplemented, the tentative exchange amount is 16% of water amount, the water supplementing quality is displayed by a detection instrument, the hardness is 740mg/L and alkalinity is 585.6mg/L, the pH value is 7.78, TDS 1240mg/L and other parameters are displayed, after the circular operation is carried out for 30 hours, the hardness, the alkalinity and the pH value are gradually increased, the WSI index shows that the scale formation tendency exists, external water is stopped to be added, static treatment is carried out, the stable operation is carried out for 44 hours, water supplementing treatment can be carried out according to the automatically detected data and the calculated WSI index, the introduced system water hardness is 740mg/L and alkalinity is 585.6mg/L, the pH value is 7.78 and TDS 1240mg/L, the water supplementing amount is adjusted, the optimal dynamic water inflow amount is gradually obtained for 12% of a bypass system, the water quality is relatively.
Figure BDA0001485593660000082
Figure BDA0001485593660000091

Claims (4)

1. An electrochemical water quality stabilizing and purifying device is characterized by comprising a circulating water tank, electrodes, a pH sensor, a conductivity sensor, an alkalinity sensor, a calcium ion sensor, a bicarbonate radical sensor, a floating ball, a photoelectric sensor, a monochromatic light source and a microcontroller;
the circulating water tank is a reaction tank with an opening at the upper end, and a water inlet is formed in the circulating water tank and is connected with an external water inlet pipeline; a solid outlet and a water outlet are arranged at the lower part of the circulating water tank, the solid outlet is used for periodically discharging precipitates generated by the reaction, and the water outlet is used for discharging treated water;
the electrodes are of a cathode and anode integrated structure, can exchange roles according to requirements and are a first electrode and a second electrode; the outer surfaces of the first electrode and the second electrode are provided with a chute and a bulge, the chute is provided with a through hole and is used for throwing and directionally conveying the medicament, and the bulge part is favorable for discharging and electrolyzing; the first electrode is sequentially wrapped with an ion exchange membrane and a ceramic membrane, and the second electrode surrounds the first electrode; changing the roles of the cathode and the anode according to the electrolysis requirement, and ensuring that the area ratio of the cathode to the anode is 10-5000: 1, adjusting the power supply voltage to make the current density be 0.1-1000mA/cm2；
The pH sensor, the conductivity sensor, the alkalinity sensor, the calcium ion sensor and the bicarbonate radical sensor are inserted into the water body of the circulating water tank, the detection is not influenced mutually, and the real-time monitoring of the pH, the conductivity, the alkalinity, the calcium ion concentration and the bicarbonate radical concentration is realized;
the floating ball is controlled by a switch, is fixed on the inner wall of the circulating water tank and is used for positioning the water inlet height;
the photoelectric sensor and the monochromatic light source are symmetrically arranged on the outer side of the circulating water tank and are matched with each other to measure the concentration of algae in the water body, and the wavelength of the monochromatic light source is 300-1000 nm;
the electrodes, the pH sensor, the conductivity sensor, the alkalinity sensor and the photoelectric sensor are all connected to the microcontroller, and the microcontroller realizes real-time monitoring and control of all parts;
the first electrode and the second electrode are made of composite conductive carbon-based materials, conductive plastics or conductive alloys and are in cylindrical or square solid or hollow structures.
2. The electrochemical water quality stabilizing and purifying device according to claim 1, wherein the microcontroller is a PLC assisted by a touch screen, a relay or a photo-coupler, a switch, and an AD converter.
3. An electrochemical water quality stabilization and purification apparatus as claimed in claim 1 or 2, wherein the power source used in the electrochemical water quality stabilization and purification apparatus is provided by converting solar energy into electric energy.
4. An electrochemical water quality stabilizing and purifying method comprises the following steps:
(1) the algae pollution level index WZI is compared to the set point:
determining the set value to be 1, setting the large-area electrode as an anode when the WZI value is greater than the set value of 1, setting the electrolytic voltage to be 0.1-60V, and introducing 0.01-2.5mol/L sodium chloride or potassium chloride into an anode chute to accelerate the separation of oxidizing substances into solution so as to effectively remove algae; when WZI is less than the set value 1, indicating that the algae removal is finished;
(2) after the WZI value is judged to be less than the set value 1 by the microprocessor, waiting for 1-20 minutes; detecting relevant parameters of the water body by a pH sensor, a conductivity sensor, an alkalinity sensor, a calcium ion sensor and a bicarbonate radical sensor; calculating a corrosion index WFI according to formulas (a), (b) and (c) to judge the corrosivity of the water quality;
pHj＝lg(Alk)+5.14； (a)
pHs＝pK2-pKs-lgc(Ca2+)-lg c(HCO3 -)； (b)
WFI＝(2pHs-pHj)/6.6； (c)
in the formula: pH valuejIndicates the pH value when the dissolved alkaline matter is saturated, Alk indicates the alkalinity, and pHsRepresents the pH value of the calcium carbonate solution when the calcium carbonate solution is saturated; pK2Is the equilibrium constant of the second stage ionization of calcium carbonate; pKsIs the solubility product constant of calcium carbonate;
when WFI is less than 1, 0.01-2.5mol/L of sulfate, carbonate and phosphate solution is fed into the anode electrode chute, the mass ratio of the sulfate to the carbonate is adjusted to 0.1-100 according to the water quality condition, the mass ratio of the carbonate to the phosphate is adjusted to 0.1-100, and 0.01-2.5mol/L of sodium sulfate solution is fed into the cathode electrode chute; adjusting the pH value and the ion content until the WFI value is more than 1, and detecting the concentrations of calcium ions, sulfate ions and carbonate ions; calculating a scaling index WGI by judging the relation between the ratio t of the sulfate ion concentration to the carbonate ion concentration and 1000 according to system judgment selection formulas (d) and (e);
when t is>At 1000: WGI ═ (k × Ksp/[ Ca ]2+]m/[CO3 2-]m/8)-1 (d)
When t is less than or equal to 1000: WGI ═ (k × Ksp/[ Ca ]2+]m/[SO4 2-]m/8)-1 (e)
Wherein Ksp represents the ionic product constant of calcium carbonate; the k value is determined by the total TDS of the soluble solids in the water or determined according to a water quality specific test;
(1) when the TDS is not less than 5000, k is 7.2;
(2) when TDS is more than or equal to 3000 and less than or equal to 5000, k is 6.8;
(3) when TDS <3000, k is 6.4;
if WGI is more than or equal to 1, scaling is easy, a large area is adjusted to be a cathode, 0.01-1mol/L carbonate, bicarbonate or carbon dioxide is introduced into the chute, calcium, magnesium and other ions are removed, and the hardness in the solution is reduced; maintaining the voltage constant at 0.1-60V; and (4) regulating the hardness value to enable WGI to be less than 1, and continuing to detect the green alga content and the pH value in the water after the scaling index is stable.
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