AU2021102618A4 - Water treatment method and device for simultaneously removing heavy metal ions and organic pollutants from wastewater - Google Patents
Water treatment method and device for simultaneously removing heavy metal ions and organic pollutants from wastewater Download PDFInfo
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Classifications
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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
- C02F1/4608—Treatment of water, waste water, or sewage by electrochemical methods using electrical discharges
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
OF THE DISCLOSURE
The present disclosure relates to a water treatment method and device for
simultaneously removing heavy metal ions and organic pollutants from wastewater, and
belongs to the field of water pollution control. The present disclosure makes heavy
metal-organic compound pollution wastewater in a continuous flowing state flow
through a high-voltage pulsed discharge area filled with an adsorbent, so as to degrade
the organic pollutants on the surface and the adjacent area of the adsorbent by using
various physical and chemical comprehensive effects produced by pulsed discharge,
obtain active competitive adsorption sites on the surface of the adsorbent, and increase
the adsorption of the adsorbent to the heavy metal ions, thereby achieving the purpose
of simultaneously removing the heavy metal ions and the organic pollutants from the
wastewater. The present disclosure has the advantages of simple principle, convenience
in operation, and good removal effects on both heavy metal ions and organic pollutants.
The present disclosure is applicable to the treatment of the compound pollution
wastewater with heavy metal ions and organic matters.
(Figure 1)
1
Description
[01] The present disclosure belongs to the technical field of water pollution control, and particularly, relates to a water treatment method and device for simultaneously removing heavy metal ions and organic pollutants from wastewater. The present disclosure degrade the organic pollutants on the surface and adjacent area of an adsorbent through various physical and chemical comprehensive effects produced by pulsed discharge based on a competitive adsorption principle of the heavy metal ions and the organic pollutants on the adsorbent and a degradation mechanism of a pulsed discharge plasma technology on pollutants, so as to obtain active competitive adsorption sites on the surface of the adsorbent, and increase the adsorption of the adsorbent to heavy metal ions, thereby achieving the purpose of simultaneously removing the heavy metal ions and the organic pollutants from the wastewater.
[02] The shortage of water resources and the pollution of water environment are major challenges facing human beings, and also the top-priority major issues of China's sustainable development strategy. With rapid development of the industries of petrochemicals, pharmaceuticals, pesticides, dyes, and the like, the discharge amount of wastewater containing various types of biologically refractory organic pollutants and heavy metals is increasing, and the quantity and types of the organic pollutants and heavy metals in wastewater are increasing day by day. Various environmental problems caused by them have become major problems affecting human survival and health.
[03] For a long time, most of the researches on water pollution control engineering only focus on the treatment of single organic pollutants or heavy metals, but in actual water environment, the organic pollutants and the heavy metals are not completely separated, but co-exist in the same pollution source or the same environment. For example, printing and dyeing wastewater is typical compound pollution type industrial wastewater with the coexistence of refractory organic matters and heavy metal ions. Untreated printing and dyeing wastewater not only contains a large number of high-toxicity dyes, bleaching agents, salts, acids, and bases, but also contains heavy metal elements, such as cadmium, copper, zinc, chromium, and iron. Oil refining wastewater also contains multiple types of pollutants: polycyclic aromatic hydrocarbons, ammonium salts, sulfides, cyanides, phenols, zinc, chromium, and other heavy metals. Other similar industrial wastewater, such as foundry wastewater, papermaking wastewater, metal processing wastewater, and electroplating wastewater, also generally have the problem of compound pollution of organic matters and heavy metals. In addition, in some areas where urban sewage and industrial wastewater are collected and treated together, or in industrial wastewater treatment plants where centralized treatment is performed in industrial parks, it can also be seen that the wastewater contains not only toxic and harmful refractory organic matters, but also multiple types of heavy metals. The types, contents, and existing forms of heavy metals and organic matters in this type of compound pollution wastewater vary with different production enterprises. Most of them have low concentration of heavy metal ions, high content of organic matters, complex compositions, and very strict treatment requirements, so how to economically and effectively remove the organic matters and heavy metals from the wastewater has become an important lesson in the field of environmental protection in recent years.
[04] At present, for the heavy metal-organic matter compound pollution wastewater, the traditional treatment methods at home and abroad generally includes two steps: first, removing the heavy metal ions, which mainly includes the following methods: (1) adding chemical reagents to precipitate the heavy metal ions; (2) separating the heavy metal ions from a water phase by using an air floatation technology; (3) removing the heavy metal ions through physical adsorption (such as, activated carbon, grafted starch, zeolite, and diatomite); then, degrading the organic matters in the wastewater by the methods, such as a biological method (for example, an activated sludge method and a biological membrane method), and a chemical oxidation method. Obviously, the traditional methods for treating the heavy metal-organic matter compound pollution wastewater are complex. The chemical reagents are added during pretreatment, which increases the treatment cost, causes secondary pollution, and brings new pollutants into the wastewater. A large amount of air needs to be introduced into an air flotation method, so both the equipment investment and the operation cost are greatly increased. Although the physical adsorption method (for example, activated carbon adsorption) can effectively remove the heavy metals and the organic pollutants from the wastewater, the adsorbent is easily saturated, so the adsorbent needs to be replaced periodically, and there are also the problem about how to recover the heavy metal elements and the like. In addition, the adsorption method cannot remove the organic pollutants from the wastewater fundamentally, but only transfers the organic pollutants to the adsorbent. It can be seen that the traditional methods for treating the heavy metal-organic matter compound pollution wastewater cannot meet the current increasingly severe water pollution situation, and have many disadvantages. From the perspective of technical feasibility and economic efficiency, it is particularly important to develop a novel method with low pollution and low investment for treating the above-mentioned wastewater.
[05] Pulse streamer corona discharge plasma formed by taking a high-voltage pulse power supply as an external power supply is in a corona discharge plasma form which is widely used in the treatment of refractory organic wastewater. As an advanced oxidation water treatment technology, compared with other advanced oxidation technologies, the pulsed discharge plasma technology has a plurality of advantages, including that: direct pulsed discharge in an aqueous solution can be operated at normal temperature and normal pressure, in-situ chemical oxidizing species can be generated in the aqueous solution to oxidize and degrade the organic matters without adding catalyst in the whole discharge process, and the technology is economical and effective for the treatment of the low-concentration organic matters. In addition, the forms of reactors applying the pulsed discharge plasma water treatment technology can be adjusted flexibly, the operation process is simple, and the corresponding maintenance cost is also relatively low. However, for a long time, the problem of low energy efficiency of pollutant degradation in a pulsed discharge plasma system is a key problem affecting its application. For this reason, many scholars propose to combine the pulsed discharge plasma technology with other oxidizing species, advanced oxidation processes or physical actions to degrade pollutants, so as to improve the energy efficiency of the technology. It is not difficult to find that although the combination of the pulsed discharge plasma technology and other technologies can effectively improve the energy efficiency of pollutant degradation, they only aim at the organic pollutants in the wastewater, but cannot do anything for the heavy metal-organic matter compound pollution wastewater. In view of this and the disadvantages of the current adsorbent in the treatment of heavy metal and organic pollution wastewater, the present disclosure proposes that the pulsed discharge plasma technology and an adsorbent adsorption technology are combined for simultaneously removing the heavy metal ions and organic pollutants from the wastewater.
[06] The objective of the present disclosure is to provide a water treatment method and device capable of simultaneously removing metal ions and organic pollutants from wastewater, which has high treatment efficiency and convenience in operation and management, and does not produce secondary pollution.
[07] The basic idea of the present disclosure is that: an adsorbent is a concentration center. A high-concentration environment is firstly created on the surface and the adjacent area of the adsorbent, and then the organic pollutants on the surface and the adjacent area of the adsorbent are degraded by using various physical and chemical effects formed in a pulsed discharge process. On one hand, the energy consumption is reduced, and the degradation efficiency of the organic pollutants is improved; on the other hand, active competitive adsorption sites of the adsorbent are released to increase the adsorption capacity of the adsorbent to heavy metal ions, prolong the service life of the adsorbent, and finally, separate and remove the heavy metal ions and the organic pollutants from the wastewater.
[08] The technical solution of the present disclosure is that:
[09] (i) An adsorbent (7) is ordinary commercial activated carbon, silica gel, alumina, molecular sieve, or natural clay. When the used adsorbent (7) is the particular activated carbon, silica gel, alumina, molecular sieve, or natural clay, the range of the particle size of the adsorbent (7) is 0.5 mm to 20 mm; when the used adsorbent (7) is powdery activated carbon, silica gel, alumina, molecular sieve, or natural clay, the range of the particle size of the adsorbent (7) is 2 meshes to 250 meshes.
[10] (ii) A process for simultaneously removing the heavy metal ions and the organic pollutants from the wastewater includes:
[11] First step, opening a gas valve (13), blowing gas into a reactor (2), then making the wastewater containing the heavy metal ions and organic pollutants and the adsorbent (7) locate in a discharge area in the reactor (2), and closing the reactor (2), where the range of the ratio of the volume of the adsorbent (7) to the volume of the wastewater to be treated is 0 to 0.8;
[121 Second step, closing a power switch (18), and adjusting the frequency and output voltage of a pulse power supply (1) to form stable corona discharge, streamer discharge or glow discharge between pinhole electrodes (3) and a plate electrode (5), where the discharge time is 0.5 minute to 12 hours;
[13] Third step, after the discharge is ended, returning the output voltage of the pulse power supply (1) to zero, disconnecting the power switch (18),opening the reactor (2), and taking the treated wastewater and the adsorbent (7) from the reactor (2), so that the treatment is ended.
[14] The device used by the present disclosure mainly consists of a pulse power supply (1), a reactor (2), and auxiliary equipment.
[15] The pulse power supply (1) is a dual positive and negative pulse power supply. Both the positive pulse voltage and the negative pulse voltage can be adjusted independently. The pulse power supply (1) has the frequency adjustment range of 0 Hz to 200 Hz, the pulse peak voltage adjustment range of 0 kV to 500 kV, and the pulse power adjustment range of 0 kW to 200 kW. The reactor (2) consists of pinhole electrodes (3), a metal plate (4), a plate electrode (5), a metal screw (6), a gas inlet (8), and an exhaust outlet (9). When it is necessary to make the wastewater to be treated in the reactor (2) in a circulating state, the reactor (2) further includes a water inlet (10) and a water outlet (11). The pinhole electrodes (3) are metal pins with the hole diameter of 1 mm to 100 mm and the length of 5 mm to 500 mm, and are fixed to the circular metal plate (4) with the thickness of 1 mm to 1000 mm and the area of 100 mm2 to 10 m 2. One to three pinhole electrodes (3) are uniformly distributed on each square meter of the metal plate (4). The plate electrode (5) is a circular metal plate with the thickness of 1 mm to 1000 mm and the area of 50 mm 2 to 8 m2 , and is fixed to the top of the reactor (2) through the metal screw (6). The plate electrode (5) can be immersed in the wastewater to be treated, and can also be placed above a liquid level of the wastewater to be treated to prevent the plate electrode (5) from being corroded. The distance between the plate electrode (5) and the pinhole electrodes (3) can be adjusted through the metal screw (6), and the adjustment range is 1 mm to 5 m. A high-voltage output end of the pulse power supply (1) is connected to the metal plate (4) after being connected in series with a protective resistor (17), and a low-voltage output end of the pulse power supply (1) and the metal screw (6) are grounded together after being connected in series with a power switch (18).
[16] The auxiliary equipment is determined according to the process in application. The auxiliary equipment includes the control devices, such as the protective resistor (17) and the power switch (18), matched with the power supply. In order to produce a large number of active species in the reactor (2), a gas needs to be injected into the reactor (2), so the device also needs to be provided with a gas cylinder (12), a gas valve (13), and an exhaust absorption tank (14). The gas is injected from the gas cylinder (12), passes through the gas valve (13), then enters the reactor (2) through the gas inlet (8), and finally is discharged from the exhaust outlet (9) into the exhaust absorption tank (14). Because the exhaust contains a large number of active species, such as ozone, the exhaust can be injected into the reactor (2) again, which can achieve the purpose of improving the treatment effect. Meanwhile, the device for treating the exhaust is not needed, so the production of secondary pollution is reduced. The gas blown into the reactor (2) is air, oxygen, nitrogen, ozone, argon, and the like, where air is 0% to 100%, oxygen is 0% to 100%, nitrogen is 0% to 100%, ozone is 0% to 100%, and argon is 0% to 100%. In order to improve the treatment load and efficiency of the reactor (2), the wastewater to be treated in the reactor (2) can be in a circulating state, so a liquid storage bottle (15) and a peristaltic pump (16) also needs to be arranged in the device. The wastewater to be treated in the liquid storage bottle (15) enters the reactor (2) through the water inlet (10) by the peristaltic pump (16), and then returns to the liquid storage bottle (15) through the water outlet (11) to realize the circulating of the wastewater.
[17] For the water treatment method for simultaneously removing heavy metal ions and organic pollutants from wastewater of the present disclosure, the used adsorbent (7) may be activated carbon, silica gel, alumina, molecular sieve, and natural clay, and may also be the adsorbent loaded with TiO2 and metal (Ag, Au, Pb, Mn and the like) catalysts.
[18] For the water treatment device for simultaneously removing heavy metal ions and organic pollutants from wastewater of the present disclosure, the shell of the reactor (2) may be designed into a cube or a cuboid, and at this time, the metal plate (4) and the plate electrode (5) are cubes or cuboids.
[19] With respect to the determination of the operating parameters of the water treatment method and device for simultaneously removing heavy metal ions and organic pollutants from wastewater, the following aspects of problems must be paid attention to:
[20] a. When the wastewater is injected into the reactor (2), gas needs to be blown into the reactor (2) first, otherwise, the wastewater will flow to the bottom of the reactor (2) through the pinhole electrodes (3) and leave a discharge area, so that the purpose of treating the wastewater cannot be achieved.
[21] b. The distances between the needles of various pinhole electrodes (3) and the plate electrode (5) are consistent, if the distances are not consistent, partial discharge will occur to affect the treatment effect of the wastewater.
[22] c. The output voltage of the pulse power supply (1) is slowly adjusted to form stable corona discharge, streamer discharge or glow discharge between the pinhole electrodes (3) and the plate electrode (5).
[23] d. When the gas needs to be introduced into the reactor (2), the flow rate of the gas in the reactor (2) cannot be too high, otherwise, large bubbles will be formed in the reactor (2) to cause instable discharge, meanwhile, highly active species produced by the discharge are taken out from the reactor (2) without acting on the pollutants, which is not beneficial to the removal of the pollutants and is a waste of energy.
[24] e. When the wastewater to be treated in the reactor (2) needs to be circulated, the flow rate of wastewater circulating cannot be too high, otherwise, instable partial discharge will be produced to affect the removal effect of the pollutants.
[25] f. Gas holes of the pinhole electrodes (3) are prevented from being blocked when the adsorbent (7) is filled into the reactor (2), so as to prevent the production of non-uniform discharge.
[26] When the water treatment method and device for simultaneously removing heavy metal ions and organic pollutants from wastewater of the present disclosure are used, issues needing attention are as follows:
[27] (1) check the correctness and the safety of a power supply system;
[28] (2) ensure the gas tightness of the reactor (2), so as to prevent the leakage of the exhaust, such as ozone.
[29] The present disclosure achieves the beneficial effects and benefits that a new electrical technology, namely, the pulsed discharge plasma technology, developed rapidly in recent years combinating with chemical adsorption and separation engineering is applied to the treatment of heavy metal-organic matter compound pollution wastewater. The method has the advantages of high treatment efficiency, convenience in operation and management, no secondary pollution, and the like.
[30] The present disclosure will be further described below with reference to the accompanying drawings and specific implementation manners.
[31] FIG. 1 is a schematic systematic diagram of a water treatment method and device for simultaneously removing heavy metal ions and organic pollutants from wastewater.
[32] FIG. 2 is a three-dimensional schematic diagram of a cylindrical reactor (2) of the present disclosure.
[33] FIG. 3 is a main-view schematic diagram of a plate electrode (5) of the cylindrical reactor (2) at a liquid level of the present disclosure.
[34] FIG. 4 is a top-view schematic diagram of the cylindrical reactor (2) of the present disclosure.
[35] FIG. 5 is a top-view schematic diagram of a cubic reactor (2) of the present disclosure.
[36] FIG. 6 is a main-view schematic diagram of the plate electrode (5) of the cylindrical reactor (2) above the liquid level of the present disclosure.
[37] In the drawings: 1-pulse power supply; 2-reactor; 3-pinhole electrode; 4-metal plate; 5-plate electrode; 6-metal screw; 7-adsorbent; 8-gas inlet; 9-exhaust outlet; -water inlet; 11-water outlet; 12-gas cylinder; 13-gas valve; 14-exhaust absorption tank; 15-liquid storage bottle; 16-peristaltic pump; 17-protective resistor; 18-power switch.
[38] The device used in the present example is as shown in FIG. 1. A pulse power supply (1) adopts positive pulse with the frequency of 35 Hz and the pulse peak voltage adjustment range of 0 kV to 50 kV. The shell of a reactor (2) is made of organic glass, and is shaped as a cylinder with the diameter of 100 mm, and the height of 150 mm. A plate electrode (5) in the present example is a circular stainless steel plate with the diameter of 80 mm and the thickness of 5 mm, and is immersed into the wastewater to be treated. Pinhole electrodes (3) are seven 6# medical needles that are uniformly distributed on a circular metal plate (4) with the diameter of 90 mm and the thickness of
3 mm. The distance between two pinhole electrodes (3) is 15 mm. The distance between each pinhole electrode (3) and the plate electrode (5) is 15 mm. The gas introduced into the reactor (2) is air. The used adsorbent (7) is columnar coal activated carbon with the diameter of 1.5 mm and the average length of 3 mm, and the filling amount of the activated carbon is 2.0 g. In addition, the present example uses auxiliary equipment, such as a gas cylinder (12), a gas valve (13) with a flowmeter, an exhaust absorption tank (14), a liquid storage bottle (15), a peristaltic pump (16), a protective resistor (17), and a power switch (18).
[39] In the present example, commercial chemical pure cadmium chloride and phenol are selected as treatment objects, and are prepared into simulated heavy metal-organic compound pollution wastewater with the Cd2 concentration of 20 mg/L and the phenol concentration of 100 mg/L. A test of removing heavy metal ions and organic pollutants from wastewater is performed by using the water treatment method and device for simultaneously removing heavy metal ions and organic pollutants from the wastewater. The steps are as follows:
[40] First step, the correctness and the safety of a power supply system are checked, and the gas tightness of the reactor (2) is ensured.
[41] Second step, discharge treatment is performed. The treatment process is as follows:
[42] Firstly, 2.0 g of activated carbon is placed in the reactor (2), the reactor (2) is closed, the gas valve (13) is opened, and air is blown into the reactor (2), where the air flow rate is 6 L/min; the peristaltic pump (16) is started, and the wastewater to be treated containing the Cd 2 and the phenol in the liquid storage bottle (15) is injected into the reactor (2), where the volume of the wastewater is 250 mL.
[43] Secondly, the power switch (18) is closed, and the frequency of the pulse power supply (1) is adjusted to be 35 Hz and the pulse peak voltage is adjusted to be 25.4 kV to form stable corona discharge, streamer discharge or glow discharge between the pinhole electrodes (3) and the plate electrode (5), where the discharge time is 15 min.
[44] Finally, treatment effect analysis is performed. Samples are sampled from the liquid storage bottle (15) every other 5 min, the concentrations of the Cd2 and the phenol in the wastewater are analyzed; detections find that the concentrations of the Cd 2 and the phenol in the wastewater are gradually decreased along with the increase of the discharge time. After 15 minutes' treatment, the treatment efficiency of the Cd2 +is 18.4%, and the treatment efficiency of the phenol is 49.1 %.
[45] Third step, after the end of the discharge, the output voltage of the pulse power supply (1) is returned to zero, the power switch (18) is disconnected, then the treated wastewater is discharged from the reactor (2) through the peristaltic pump (16), the peristaltic pump (16) and the gas valve (13) are turned off, the reactor (2) is opened, and the adsorbent (7) is taken out, so that the treatment is ended.
[46] In order to determine that the removal effects of the phenol and the Cd2 are mainly achieved by the degradation effect of the pulsed discharge to the phenol and the increase of the adsorption sites of the surface of the adsorbent (7) to the Cd2 caused by the degradation effect, the following tests are also performed:
[47] First, 2.0 g of activated carbon is placed in the reactor (2), the reactor (2) is closed, the gas valve (13) is opened, and air is blown into the reactor (2), where the air flow rate is 6 L/min; the peristaltic pump (16) is started, and the wastewater to be treated containing the Cd 2 and the phenol in the liquid storage bottle (15) is injected into the reactor (2), where the volume of the wastewater is 250 mL.
[48] Second, the concentrations of the Cd2 and the phenol in the liquid storage bottle (15) are analyzed. The analysis results find that after 15 minutes' adsorption, the removal efficiency of the Cd2 is 5.6%, and the treatment efficiency of the phenol is 19.3%. This indicates that the removal of phenol in the wastewater is mainly caused by the pulsed discharge, and the removal of the Cd2 is also mainly caused by degrading the phenol on the activated carbon by the pulsed discharge, so the adsorption amount of the activated carbon to the Cd2 is increased and the removal rate of the Cd2 is improved by obtaining more adsorption sites on the surface of the activated carbon.
Claims (5)
1. A water treatment device for simultaneously removing heavy metal ions and organic pollutants from wastewater, consisting of a pulse power supply (1) and a reactor (2), wherein the pulse power supply (1) is a dual positive and negative pulse power supply; both the positive pulse voltage and the negative pulse voltage can be adjusted independently; the pulse power supply (1) has the frequency adjustment range of 0 Hz to 200 Hz, the pulse peak voltage adjustment range of 0 kV to 500 kV, and the pulse power adjustment range of 0 kW to 200 kW; a reactor (2) consists of pinhole electrodes (3), a metal plate (4), a plate electrode (5), and a metal screw (6); an adsorbent is placed in a discharge area of the reactor; the pinhole electrodes (3) are metal pins with the hole diameter of 1 mm to 100 mm and the length of 5 mm to 500 mm, and are fixed to a circular metal plate (4) with the thickness of 1 mm to 1000 mm and the area of 100mm 2 to 10 M2 ; the plate electrode (5) is a circular metal plate with the thickness of 1 mm to 1000 mm and the area of 50 mm 2 to 8 m2 , and is fixed to the top of the reactor (2) through the metal screw (6); the adjustment range of the distance between the plate electrode (5) and the pinhole electrodes (3) is 1 mm to 5 m; a high-voltage output end of the pulse power supply (1) is connected to the metal plate (4) after being connected in series with a protective resistor (17); a low-voltage output end of the pulse power supply (1) and the metal screw (6) are grounded together after being connected in series with a power switch (18); an exhaust outlet (9) and a gas inlet (8) are correspondingly formed in the upper end and the lower end of the reactor (2); the gas inlet (8) is connected to a gas cylinder (12) through a gas valve (13); the exhaust outlet (9) is connected to an exhaust absorption tank (14); a water outlet (11) and a water inlet (10) are correspondingly formed in the upper side and the lower side of the reactor (2); the water inlet (10) is connected to the liquid storage bottle (15) through a peristaltic pump (16); the water outlet (11) is connected to the liquid storage bottle (15).
2. The water treatment device for simultaneously removing heavy metal ions and organic pollutants from wastewater according to claim 1, wherein the plate electrode (5) is immersed into the wastewater to be treated.
3. The water treatment device for simultaneously removing heavy metal ions and organic pollutants from wastewater according to claim 1, wherein the plate electrode (5) is located above the liquid level of the wastewater to be treated; comprising the following steps: outputting a high voltage by the pulse power supply (1) and applying the high voltage to the heavy metal-organic compound pollution wastewater filled with an adsorbent (7) between the metal plate (4) and the plate electrode (5); adjusting the distance between the plate electrode (5) and the needles of the pinhole electrodes (3), the frequency of the pulse power supply (1) and the output voltage peak value of the pulse power supply (1) to form stable corona discharge, streamer discharge or glow discharge between the plate electrode (5) and the needles of the pinhole electrodes (3); degrading the organic pollutants on the surface and adjacent area of the adsorbent (7) by various physical and chemical effects produced by pulsed discharge, so as to obtain active competitive adsorption sites on the surface of the adsorbent (7), and increase the adsorption of the adsorbent (7) to the heavy metal ions, thereby achieving the purpose of simultaneously removing heavy metal ions and organic pollutants from wastewater.
4. The method according to claim 3, wherein the adsorbent (7) is filled into the heavy metal-organic compound pollution wastewater between the metal plate (4) and the plate electrode (5); the filled adsorbent (7) is ordinary commercial particular activated carbon, silica gel, alumina, molecular sieve, or natural clay; the range of the particle size of the adsorbent is 0.5 mm to 20 mm; the range of the ratio of the volume of the added adsorbent (7) to the volume of the wastewater to be treated is 0 to 0.8; or, wherein the adsorbent (7) is filled into the heavy metal-organic compound pollution wastewater between the metal plate (4) and the plate electrode (5); the filled adsorbent (7) is ordinary commercial powdery activated carbon, silica gel, alumina, molecular sieve, or natural clay; the range of the particle size of the adsorbent is 2 meshes to 250 meshes; the ratio of the volume of the added adsorbent (7) to the volume of the wastewater to be treated is 0 to 0.8.
5. The method according to claim 3, comprising the following process steps: first step, opening a gas valve (13), blowing gas into the reactor (2), then making the wastewater to be treated containing heavy metal ions and organic pollutants and the adsorbent (7) locate in a discharge area in the reactor (2), and closing the reactor (2); second step, closing the power switch (18), and regulating the frequency and output voltage of the pulse power supply (1) to form the stable corona discharge, streamer discharge or glow discharge between the needle of the pinhole electrode (3) and the plate electrode (5), wherein the discharge time is 0.5 minute to 12 hours; third step, after the discharge is ended, returning the output voltage of the pulse power supply (1) to zero, disconnecting the power switch (18), opening the reactor (2), and taking the treated wastewater and the adsorbent (7) out from the reactor (2); wherein in the first step, the gas blown into the reactor (2) is air, oxygen, nitrogen, ozone, or argon, wherein air is 0% to 100%, oxygen is 0% to 100%, nitrogen is 0% to 100%, ozone is 0% to 100%, and argon is 0% to 100%.
),* ),* ˉˉ
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ˉˉ 17 May 2021
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114038736A (en) * | 2021-11-10 | 2022-02-11 | 重庆臻宝实业有限公司 | Cleaning method for semiconductor material |
| CN114344984A (en) * | 2021-12-14 | 2022-04-15 | 昌和化学新材料(江苏）有限公司 | Hydrolysis-resistant triphenyl phosphite byproduct recovery device and use method thereof |
| CN115054963A (en) * | 2022-03-25 | 2022-09-16 | 山东省畜产品质量安全中心(山东省畜禽屠宰技术中心) | Effluent treatment plant is used in livestock-raising with isolating construction |
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2021
- 2021-05-17 AU AU2021102618A patent/AU2021102618A4/en not_active Ceased
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114038736A (en) * | 2021-11-10 | 2022-02-11 | 重庆臻宝实业有限公司 | Cleaning method for semiconductor material |
| CN114344984A (en) * | 2021-12-14 | 2022-04-15 | 昌和化学新材料(江苏）有限公司 | Hydrolysis-resistant triphenyl phosphite byproduct recovery device and use method thereof |
| CN115054963A (en) * | 2022-03-25 | 2022-09-16 | 山东省畜产品质量安全中心(山东省畜禽屠宰技术中心) | Effluent treatment plant is used in livestock-raising with isolating construction |
| CN115054963B (en) * | 2022-03-25 | 2023-09-26 | 山东省畜产品质量安全中心(山东省畜禽屠宰技术中心) | Wastewater treatment device with separation structure for livestock breeding |
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