CN2646129Y - Multiphase and polynary catalysis, electrolysis and oxidation sewage treatment device adopting concentric circles electrodes - Google Patents

Abstract

The utility model relates to a sewage treatment device adopting multi-phase multi-element catalytic electrolytic oxidation of concentric circular electrodes, which belongs to the technical field of sewage treatment. In particular, it relates to a high-efficiency sewage treatment device and method developed by using a heterogeneous multi-element catalytic electrolytic oxidation process. It combines solid adsorption material, electrode material, catalyst carrier, liquid phase catalysis, gas phase oxidant and electrolysis to form a sewage physical-chemical-electrolytic treatment device with a comprehensive removal process. It combines the adsorption material with the catalyst carrier, and at the same time, it is used as an electrode material and fluidized in the reactor to achieve the goal of removing bioinhibitory pollutants and biological metabolites. It can be widely used in pretreatment before biochemistry and biochemical Advanced treatment of the final sewage in order to realize the resource utilization of sewage. It has the characteristics of small equipment size, small footprint, high processing efficiency, low power consumption, easy operation and maintenance.

Description

A sewage treatment device using multi-phase multi-element catalytic electrolytic oxidation with concentric circular electrodes

Technical Field The utility model belongs to the technical field of sewage treatment. In particular, it relates to a high-efficiency sewage treatment device developed by using a heterogeneous multi-component catalytic electrolytic oxidation process.

Background technology In various physical and chemical treatment processes of sewage, the process of completely mineralizing pollutants is mainly oxidation, electrolysis and their associated processes. From a chemical point of view, all pollutants are oxidatively decomposed and finally converted into carbon dioxide. Like any chemical reaction process, the catalyst greatly promotes the reaction, and the catalyst makes many reactions that cannot be carried out by non-catalytic processes proceed quickly. Catalysts exist in the reaction system in two states, homogeneous and heterogeneous, each of which has different catalytic and process characteristics, and heterogeneous catalysis has attracted much attention because of its easy catalyst recovery. In addition to catalysts, oxidants are one of the important factors in the reaction. Various oxidants including air and electric energy are important oxidants. The latter is involved in the electro-oxidation process. Electrolytic oxidation has its unique advantages when people explore green oxidants. , followed by environmentally friendly oxidants such as air, ozone and hydrogen peroxide. Of course, since the concentration of pollutants in sewage is many orders of magnitude lower than that in conventional chemical plants, the mass transfer of pollutants in the reaction system cannot be ignored. Therefore, using the adsorption process to enrich pollutants on the surface of the reaction medium (or the surface of the catalyst) is an important way to improve efficiency. All kinds of adsorption materials have different adsorption properties, which can adapt to the adsorption of various pollutants, so as to effectively transfer pollutants from the water phase to the solid phase and purify sewage. As long as the pollutants adsorbed on the surface of the solid phase can be quickly oxidized and decomposed, the adsorption process can be carried out continuously, and finally the continuous treatment process of sewage can be realized. Among all kinds of adsorbents, materials with adsorption, catalysis and conductivity should be selected here in order to meet the requirements of the above-mentioned process.

The predecessor of this technology: the continuous adsorption-electrolytic regeneration sewage treatment process and technology has obtained the patent right. In the aforementioned technology, the adsorption process is mainly used to transfer the pollutants to the surface of the electrode. The electrode is the adsorption material, and then the pollutants are electrolytically decomposed. Regenerate the adsorbent material. Practice has proved that this technology has a very wide application prospect, and it has shown high removal efficiency in dye wastewater treatment, chemical wastewater treatment, oil extraction wastewater treatment, oil refining wastewater treatment, domestic sewage treatment, advanced sewage treatment, etc. However, due to the wide variety and complex properties of pollutants, there are always some pollutants that cannot be completely mineralized. After research, it is found that the introduction of catalytic process and oxidation process is necessary.

SUMMARY OF THE INVENTION The purpose of this utility model is to provide a sewage treatment device that can completely mineralize and remove pollutants, biological metabolites, and trace organic matter that have an inhibitory effect on organisms.

The technical solution of the utility model is to combine the processes of heterogeneous catalysis, electrolytic decomposition, electrolytic oxidation, chemical oxidation, and electroflocculation to form a multi-component reaction process to solve the problem of removing various pollutants. Heterogeneous catalysis refers to the use of solid catalysts and liquid catalysts in this technology, and the reaction system is three phases of solid, liquid and gas. Multivariate refers to the variety of reaction reagents involved in this technology: liquid-phase oxidant and gas-phase oxidant; multivariate also refers to the variety of pollutant removal processes involved in this technology: electrolysis, electro-oxidation, electro-flocculation, air oxidation, etc.

The utility model has various structural forms, as long as the adsorption material can be filled between the polar plates with alternating positive and negative electric levels, and a fluidized state can be formed under the condition of air aeration.

A typical heterogeneous multi-element catalytic electrolytic oxidation sewage treatment device, including water outlet (1), equipment support (2), central electrode slot (3), fixing bolts (4), lower flange (5), lower packing support Plate (6), lower head (8), equipment support (9), electrode lead (10), cylindrical electrode (11), upper head (12), upper flange (13), upper support plate (14 ), fixing bolts (15), adsorption packing (17), equipment main body (19), water inlet (20), also includes air inlet pipe (21), air distribution nozzle (7), electrode baffle plate (16) and electrode The guide tube (18), the central cylindrical electrode (11) is an anode.

The diameter of the equipment main body (19) is 1-2 meters, and the cathode is the equipment main body.

The electrode material can be inert material graphite, precious metal material or ordinary carbon steel, depending on the application occasion and current density. Generally, the cathode material can be ordinary steel, and the anode is an inert electrode, such as graphite and inert metal.

Adsorption filler (17) is a conductive adsorption material, including activated carbon particles, graphite particles, coke particles, inorganic carrier or resin, and its filling and mixing ratio varies with the quality of the treated water, and also varies with the requirements of the treatment depth. The filler is filled with a volume ratio of 10-15%, and its particle size is 10-100 mesh. The surface of the filler is catalytically active or carries a catalyst.

A method for treating sewage with heterogeneous and multi-element catalytic electrolysis oxidation is to add a water-soluble catalyst to the water inlet (20), and the dosing ratio changes with the concentration of sewage. The oxidant enters the main body (19) of the equipment through the air intake pipe (21) and the air distribution nozzle (7), so that the adsorption filler (17) is in a fluidized state between the electrodes. The gas-water ratio varies from 10/1 to 120/1.

The device described in the utility model, its power supply is equipped with usable voltage-stabilized DC power supply, pulsating DC power supply or high-frequency pulse DC power supply, depending on the treatment object and water quality, the power supply voltage should adopt a safe voltage below 36 volts, and the electric field strength is 1 to 10 volts/cm.

Water-soluble catalysts are metal salts, generally relatively cheap, and the fluidizing medium and gas oxidant are air.

Metal salts are iron salts, aluminum salts, magnesium salts or manganese salts.

The residence time of water in the main body (19) of the equipment is 0.5 to 3 hours, mainly depending on the concentration of raw water pollutants. The residence time is longer at high concentrations and shorter at low concentrations, and is also related to the required treatment level. , the higher the level, the longer the dwell time.

The beneficial effects of the utility model are:

1. Wide range of applications, the process can be used to remove various pollutants, including urban domestic sewage, hotel living and bathing sewage, oil field oil production sewage, petroleum refining sewage, oil shipping ballast water, petrochemical plant sewage , Basic synthetic organic sewage, xylitol production and other agricultural and sideline products comprehensive utilization processing wastewater, dye production wastewater, printing and dyeing wastewater, mechanical processing wastewater, etc. It is especially suitable for the removal of trace organic matter in sewage reuse and water supply treatment.

2. It is suitable for treating sewage with a wide concentration range. For the treatment of high-concentration organic sewage when the chemical oxygen demand COD is greater than 1000mg/l, this process can be used as a pretreatment process. In addition to removing part of COD, it can also improve its biochemical properties , to facilitate subsequent processing. For the treatment of low-concentration organic sewage when COD is less than 500mg/l, especially the removal of residual biodegradable substances after biochemical treatment, this process is particularly effective, which can further reduce the concentration of wastewater pollutants and meet the discharge standards. The application of this process can also be used for the advanced treatment of mild sewage with COD less than 100mg/l, so as to meet the water quality requirements of reused water.

3. The treatment cost is low. The treatment cost of this process mainly depends on the concentration of pollutants and the concentration of inorganic salts. As long as the concentration of inorganic salts is not greater than 2000MG/L, the conductivity is not large and the leakage current is low. To treat COD at 1000mg/L Take the following sewage as an example, the power consumption is 0.2-0.8KWH/ton of water.

4. The processing process is simple, continuous operation and automatic control can be realized, and there is basically no need for manual maintenance and operation.

BRIEF DESCRIPTION OF THE DRAWINGS The utility model will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the structure and outline drawing when the utility model adopts concentric circular electrodes.

Detailed ways

Example 1

The advanced treatment and reuse of wastewater from petrochemical refineries adopts this process. The COD content of raw oil refinery sewage is below 100mg/l after conventional secondary biological treatment. The concentric circular electrode type multi-phase multi-element catalytic electrolytic oxidation sewage treatment process is used for advanced treatment to realize sewage reuse. The anode of the equipment used is graphite and the cathode is carbon. Steel, the power supply is DC power supply, the filler is activated carbon, the particle size is 10 mesh, the filling ratio is 10%, the homogeneous catalyst used is ferric salt, the dosage is 100mg/l, the gas-liquid ratio is 30/1, the sewage The pump continuously supplies water to the equipment, and the metered sewage enters the reaction device. The hydraulic retention time is 1 hour, the pollutants are decomposed and oxidized, and the drainage is purified. The COD content of the effluent is 20-30mg/l, which is 50mg lower than the national reuse water standard. /l below, power consumption is 0.6KWH/ton of water. The water can be reused as circulating cooling water for secondary use, which not only reduces environmental pollution, but also saves fresh water resources.

Example 2

The advanced treatment of domestic sewage achieves the purpose of reclaimed water. The domestic sewage COD200-300mg/l is settled, and after biochemical treatment, the COD is about 100mg/l. When using this technology for advanced treatment, the same structure and catalyst are used. The sewage is continuously supplied to the equipment by the water pump, and the measured sewage enters the equipment. , The hydraulic retention time is 1 hour, and the residual biodegradable substances are removed. The COD of the effluent is less than 50mg/l, which meets the national standard for reclaimed water reuse, and the power consumption is 0.5KWH/ton of water.

Claims (4)

1. one kind is adopted the heterogeneous multiple catalyzing electrolysis oxidation of concentric electrode waste disposal plant, comprise water outlet (1), equipment supporter (2), central electrode draw-in groove (3), standing bolt (4), lower flange (5), following filler back up pad (6), lower cover (8), equipment supporter (9), contact conductor (10), cylindrical electrode (11), upper cover (12), upper flange (13), upper backup pad (14), standing bolt (15), adsorption stuffing (17), equipment body (19), water-in (20), it is characterized in that, also comprise inlet pipe (21), gas distribution shower nozzle (7), electrode traverse baffle (16) and electrode guide shell (18), center cylindrical electrode (11) is an anode, and negative electrode is equipment body (19).

2. according to the heterogeneous multiple catalyzing electrolysis oxidation of claims 1 described a kind of employing concentric electrode waste disposal plant, it is characterized in that equipment body (19) diameter is 1～2 meter.

3. according to the heterogeneous multiple catalyzing electrolysis oxidation of claims 1 described a kind of employing concentric electrode waste disposal plant, it is characterized in that electrode materials adopts graphite, noble metal material or plain carbon stool.

4. according to the heterogeneous multiple catalyzing electrolysis oxidation of claims 1 described a kind of employing concentric electrode waste disposal plant, it is characterized in that, adsorption stuffing (17) is the sorbing material with electroconductibility, comprise activated carbon granule, graphite granule, coke granule, inorganic carrier or resin, its filling ratio is in the volume ratio filling of 10-15%, and its particle diameter is 10～100 orders.

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