CN103420451A - Electrochemical multiple oxidization sewage treatment equipment - Google Patents

Abstract

The invention relates to an electrochemical multiple oxidation sewage treatment equipment, comprising an outer ring battery system, a central battery system, a microporous conduit and a slag scraping device. Among them, the electrodes of the central battery system electrolyze neutral solution to generate ozone, and the electrodes of the outer ring battery system electrolyze water to generate hydroxyl radicals (·OH), both of which can quickly oxidize refractory organic matter in water. The electrode electrolysis reaction of the outer ring battery system can also directly remove some refractory organic matter and salt in sewage. The gas produced by the electrochemical oxidation of the outer ring battery system will form microbubbles after dissolving in water, which can adhere to fine suspended particles and oily substances in sewage and be scraped off by the slag scraping device. The present invention combines electrochemical decontamination with advanced oxidation decontamination, can simultaneously remove components such as salt, organic matter, suspended matter and bacteria in sewage, not only has fast treatment speed and low cost, but also can be used for pretreatment and treatment of sewage. Deep purification treatment.

Description

An electrochemical multiple oxidation sewage treatment equipment

technical field

The invention belongs to the technical field of environmental protection and energy saving, and relates to sewage treatment equipment, in particular to electrochemical multiple oxidation sewage treatment equipment.

Background technique

With the development of my country's industry, the discharge of industrial sewage is increasing day by day. Industrial sewage mainly comes from the production process of dyestuffs, pharmaceuticals, pesticides, chemicals and other industries. Its components are very complex, including salt, organic matter, suspended matter and bacteria, among which high-concentration organic matters are the main ones. These toxic and harmful organic substances include phenol, polychlorinated nitrobenzene, triazine substances, benzotriazole, etc., which have high concentration in sewage, high toxicity, high chemical oxygen demand, and are difficult to be degraded by ordinary microorganisms, so the degree of pollution is large , the duration is long, and the treatment is difficult. It is a hot spot and a difficult point in water pollution prevention and control. The research on its treatment has attracted increasing attention of experts at home and abroad. If the sewage is discharged directly to the environment without treatment, it will inevitably lead to serious environmental disasters.

At present, the treatment methods of high-concentration organic matter in sewage include physical treatment, chemical treatment and biological treatment. However, these treatment methods are single, the treatment process is complicated, the treatment cost is high, and various toxic and harmful components in the sewage cannot be removed at the same time, so the treatment effect is not good.

Contents of the invention

Aiming at the shortcomings of the existing industrial sewage treatment methods, the present invention provides an electrochemical multiple oxidation sewage treatment equipment, including an outer ring battery system and a central battery system located in the middle of the outer ring battery system, the two are separated by a synthetic material separator , which is characterized in that: the outer ring battery system consists of an outer ring electrode anode and an outer ring electrode cathode, both of which are metal electrodes, and the electrolyte of the outer ring battery system is sewage; the center battery system consists of a center electrode anode, a center electrode cathode and a The diaphragm between the two is composed; the anode of the center electrode is a metal electrode, the cathode of the center electrode is a graphite electrode, and the electrolyte of the center battery system is a neutral salt solution; the anode chamber of the center electrode is between the anode of the center electrode and the diaphragm, and the anode is electrolyzed The liquid cooling pipe is connected to the central electrode anolyte elevated tank and gas-liquid separator located above it, the center electrode anode cooling chamber is between the center electrode anode and the inner wall of the center battery system; the center electrode cathode is between the center electrode cathode and the diaphragm The chamber is connected to the central electrode anolyte elevated tank and gas-liquid separator located above it through the catholyte cooling pipe, and the center electrode cathode cooling chamber is between the central electrode cathode and the inner wall of the central battery system; the elevated tank and gas-liquid separation At least one microporous conduit on the top of the device extends into the electrolyte of the outer ring battery system.

In addition, in the electrochemical multiple oxidation sewage treatment equipment of the present invention, the anode of the outer ring electrode is titanium-based lead dioxide, and the cathode of the outer ring electrode is stainless steel. The anode of the central electrode is iron-based lead dioxide, and the surface is covered with a hydrophilic porous film. The neutral salt solution is a neutral NaCl solution. The diaphragm material is microporous ceramics. There is also a slag scraping device on the top of the outer ring battery system.

The beneficial effects of the present invention are:

Because the invention combines the outer ring battery system, the central battery system, the microporous conduit and the slag scraping device, and combines electrochemical decontamination with advanced oxidation decontamination, the equipment can simultaneously remove salt, organic matter, suspended It is not only fast in processing speed and low in cost, but also can be used for pretreatment and deep purification of sewage. It is a multi-functional sewage treatment equipment.

Description of drawings

The following is a further description of a high-efficiency electrochemical multiple oxidation sewage treatment equipment of the present invention in conjunction with the accompanying drawings

Fig. 1 is a cross-sectional view of a high-efficiency electrochemical multiple oxidation sewage treatment equipment in Embodiment 1.

Detailed ways

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings

Sewage mainly contains salt, organic matter, suspended solids, bacteria and other components. Conventional sewage treatment methods are relatively simple and cannot remove the above components at the same time. In order to overcome this defect, the present invention designs two combined battery systems, combining electrochemical decontamination and advanced oxidation decontamination, thereby improving decontamination effect, increasing decontamination efficiency and reducing decontamination cost.

Decontamination principle of the present invention is as follows:

The present invention includes four functional devices: an outer ring battery system, a central battery system, a microporous conduit and a slag scraping device. Among them, the electrode electrolysis of the central battery system can generate ozone (O ₃ ), which can diffuse into sewage through the microporous conduit. The outer ring battery system uses metal electrodes, and the electric field generated by the metal electrodes can directly oxidize water or hydroxide ions, thereby generating hydroxyl radicals (·OH). Both ozone and hydroxyl radicals are extremely strong oxidants, which can quickly oxidize refractory organic matter in water and mineralize them into carbonates. They can oxidize organic pollutants more thoroughly and with higher efficiency, and do not produce secondary pollutants during oxidation. secondary pollutants. In addition, the adsorption on the surface of the outer ring electrode and the simultaneous action of ozone can produce a good bactericidal effect. In addition, salt ions and refractory organic matter in sewage can be removed by oxidation-reduction reaction on the surface of the outer ring electrode. Finally, the gas produced by the electrochemical oxidation of the outer ring battery system dissolves in water to form micro-bubbles, which can adhere to fine suspended particles and oily substances in sewage, form floating flocs and float to the water surface, where they are scraped off by the slag scraping device.

Electrochemical decontamination refers to the oxidation-reduction reaction of refractory organic matter on the surface of the electrode, and the effect of desalination can be achieved at the same time. Advanced oxidation decontamination refers to the use of oxidant hydroxyl radicals (·OH) and ozone (O ₃ ) generated by electrochemical reactions to degrade pollutants. Therefore, the present invention combines electrochemical decontamination with advanced oxidation decontamination, which can simultaneously remove components such as salt, organic matter, suspended matter and bacteria in sewage, not only has a fast processing speed and low cost, but also can be used for pretreatment of sewage. treatment and deep purification treatment.

Implementation

In this embodiment, in order to ensure that the salt, organic matter, suspended solids and bacteria in the sewage are removed at the same time, the following structure is adopted:

Fig. 1 is a cross-sectional view of a high-efficiency electrochemical multiple oxidation sewage treatment equipment in Embodiment 1.

As shown in Figure 1, a kind of electrochemical multiple oxidation sewage treatment equipment in Embodiment 1 includes an outer ring battery system 16 and a central battery system 17 located in the middle of the outer ring battery system 16, and the two 16, 17 pass through a synthetic material separator separated. The outer ring battery system 16 is composed of an outer ring electrode anode 13 and an outer ring electrode cathode 14, wherein the outer ring electrode anode 13 is titanium-based lead dioxide, the outer ring electrode cathode 14 is stainless steel, and the electrolyte of the outer ring battery system 16 is sewage. Center battery system 17 is made up of center electrode anode 1, center electrode cathode 7 and diaphragm 6 between the two; center electrode anode 1 is iron-based lead dioxide, and center electrode cathode 7 is a graphite electrode. The electrolysis of center battery system 17 The solution is neutral NaCl solution. The surface of the central electrode anode 1 is also covered with a hydrophilic porous film, which is convenient for the electrode to contact with the electrolyte to generate an electrolytic reaction. The diaphragm 6 is made of microporous ceramics, which plays the role of proton exchange between yin and yang.

In addition, between the center electrode anode 1 and the diaphragm 6 is the center electrode anode chamber 2, which is connected to the center electrode anolyte high level tank and gas-liquid separator 5 located above it through the anolyte cooling pipe 4. The gas-liquid separator 5 can provide the electrolyte solution for the anode chamber 2 of the central electrode, and at the same time, can separate the gas and liquid from the ozone generated by the electrode reaction. Between the central electrode cathode 7 and the diaphragm 6 is the central electrode cathode chamber 8, which is connected to the central electrode anolyte high level tank and gas-liquid separator 11 above the catholyte cooling pipe 10, and the high level tank is also gas-liquid separator 11. The separator 11 can provide the electrolyte solution for the central electrode cathode chamber 8, and at the same time, can separate the gas and liquid of the ozone generated by the electrode reaction. Between the center electrode anode 1 and the inner wall of the center battery system 17 is the center electrode anode cooling chamber 3, and between the center electrode cathode 7 and the inner wall of the center battery system 17 is the center electrode cathode cooling chamber 9, both cooling chambers 3 and 9 adopt The water cooling system plays the role of cooling the central battery system 17 .

In addition, there are two microporous conduits 12 on the top of the central battery system 17 extending into the electrolyte of the outer ring battery system 16, and the ozone generated when the electrode reaction occurs in the central battery system 17 can diffuse into the sewage through the microporous conduits 12, thereby causing to sterilization and oxidation. The outer ring battery system 16 undergoes electrochemical oxidation, and the gas produced by 16 dissolves in water to form microbubbles, which can adhere to fine suspended particles and oily substances in the sewage, and form floating flocs that float to the water surface, thereby being located in the outer ring battery system. The slag scraping device 15 on the top of 18 is scraped off.

As a preferred solution of the present invention, the central battery system 17 can also be attached to a pressure pump. Through the pressurization of the pump, the ozone can be more easily dissolved in the organic sewage, thereby increasing the ozone concentration in the sewage and achieving better oxidation. Effect. .

Furthermore, the electrochemical multiple oxidation sewage treatment equipment of the present invention can be used for pretreatment of high-concentration organic sewage, which can reduce the pretreatment process and reduce the burden of subsequent treatment processes. On the other hand, the present invention can also be used for advanced purification treatment of sewage, so that the effect of effluent is better.

Claims (7)

1. An electrochemical multiple oxidation sewage treatment equipment, including an outer ring battery system (16) and a central battery system (17) located in the middle of the outer ring battery system (16), the two (16, 17) pass through a synthetic material separator Separated, characterized in that: the outer ring battery system (16) is composed of an outer ring electrode anode (13) and an outer ring electrode cathode (14), both of which (13, 14) are metal electrodes, and the outer ring battery system (16) The electrolyte solution is sewage; the central battery system (17) is composed of a central electrode anode (1), a central electrode cathode (7) and a diaphragm (6) between the two; the central electrode anode (1) is a metal electrode, and the central electrode anode (1) is a metal electrode. The electrode cathode (7) is a graphite electrode, and the electrolyte of the center battery system (17) is a neutral salt solution; the center electrode anode chamber (2) is between the center electrode anode (1) and the diaphragm (6), through which the anolyte The cooling pipe (4) is connected to the center electrode anolyte high level tank and gas-liquid separator (5) located above it (2), and the center electrode anode is between the center electrode anode (1) and the inner wall of the center battery system (17) Cooling chamber (3); between the center electrode cathode (7) and the diaphragm (6) is the center electrode cathode chamber (8), through the catholyte cooling tube (10) and the center electrode anolyte above it (8) The elevated tank and gas-liquid separator (11) are connected, and the central electrode cathode cooling chamber (9) is between the central electrode cathode (7) and the inner wall of the central battery system (17); the elevated tank and gas-liquid separator (5, 11) At least one microporous conduit (12) extends into the electrolyte of the outer ring battery system (16) at the top. 2. The electrochemical multiple oxidation sewage treatment equipment according to claim 1, characterized in that: the anode (13) of the outer ring electrode is titanium-based lead dioxide, and the cathode (14) of the outer ring electrode is stainless steel. 3. The electrochemical multiple oxidation sewage treatment equipment according to claim 1, characterized in that: the central electrode anode (1) is iron-based lead dioxide. 4. The electrochemical multiple oxidation sewage treatment equipment according to claim 1, characterized in that: the surface of the central electrode anode (1) is covered with a hydrophilic porous film. 5. The electrochemical multiple oxidation sewage treatment equipment according to claim 1, characterized in that the neutral salt solution is a neutral NaCl solution. 6. The electrochemical multiple oxidation sewage treatment equipment according to claim 1, characterized in that the diaphragm (6) is made of microporous ceramics. 7. The electrochemical multiple oxidation sewage treatment equipment according to claim 1, characterized in that there is a slag scraping device (15) on the top of the outer ring battery system (18).

Images