CN204675927U - A kind of device of electrochemical oxidation method treatment of dyeing and printing - Google Patents

Abstract

The utility model discloses a device for treating printing and dyeing wastewater by an electrochemical oxidation method, which belongs to the field of environmental protection technology and wastewater treatment. The device of the utility model uses a boron-doped diamond electrode as an anode, and stainless steel as a cathode. By setting the electrodes in the electrochemical reactor and allowing the waste water to circulate continuously between the water storage tank and the electrochemical reactor within a set time, Remove organic matter, salt, chroma and other pollutants to make the wastewater meet the national discharge standards. The device has the advantages of small size, high efficiency, low energy consumption and good controllability.

Description

A device for treating printing and dyeing wastewater by electrochemical oxidation

technical field

The sewage treatment device and method thereof involved in the utility model belong to the technical field of environmental protection and the technical field of waste water treatment.

Background technique

Printing and dyeing wastewater is recognized by the environmental protection industry as one of the most difficult wastewater to treat. It has high chroma, high concentration of organic matter, complex components, and many refractory organic matter. Due to the needs of the coloring process, it often contains a large amount of inorganic salts and has poor biodegradability. At present, the treatment methods of printing and dyeing wastewater include physical, chemical, biological methods or a combination of multiple methods. The degradation rate of COD by biological treatment is 50%, and the degradation rate of COD by chemical precipitation and air flotation is only 30%. Therefore, the development of economical and effective printing and dyeing wastewater treatment processes has increasingly become a topic of concern and research in the current environmental protection industry.

Compared with the traditional process, electrochemical oxidation technology is suitable for treating wastewater with high concentration of organic matter and high salt. The hydroxyl radicals generated on the surface of the electrode directly react with the organic pollutants in the wastewater without selection, and degrade them into carbon dioxide, water and simple organic matter, without adding additional redox agents, and there is no or little secondary pollution. It is a technology with strong oxidation ability, high degradation efficiency, easy automation, mild reaction conditions, relatively simple equipment and operation, and has great potential in the treatment of printing and dyeing wastewater.

Electrode material is very important for electrochemical oxidation technology, its performance directly determines the effect and efficiency of electrochemical oxidation process. The electrode materials currently used have many shortcomings, such as graphite electrodes, which have poor degradation ability to organic matter, low current efficiency, easy expansion and falling off, and noble metal electrodes such as Pt and Au have high cost and are easily poisoned by sulfide and lose their electrocatalytic ability. . Boron-doped diamond electrode is the electrode material with the best electrochemical performance and the most stable.

Traditional electrochemical reactors have low current efficiency and high cost due to unreasonable design. Reasonable reactor design can effectively strengthen the contact between hydroxyl radicals and pollutants, improve current efficiency, and reduce operating time and cost.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art and provide an efficient and reasonably designed device for treating printing and dyeing wastewater.

A device for treating printing and dyeing wastewater by electrochemical oxidation includes a water storage tank, a water pump, a constant current and voltage stabilized power supply, an electrochemical reactor, a bag filter, and an automatic controller; a water storage tank, a water pump, an electrochemical reactor, a bag type The filter is connected in sequence; the electrochemical reactor consists of two parts: the shell and the electrode assembly. The electrode assembly is the core device, with the boron-doped diamond electrode as the anode and the stainless steel electrode as the cathode; the anode and cathode are parallel to each other and placed vertically in the reactor.

The waste water is continuously circulated through the electrochemical reactor, bag filter and storage tank for a set time.

The effluent after electrochemical oxidation of wastewater flows through a bag filter to remove sediment and suspended matter.

The size of the boron-doped diamond electrode plate set inside it is 250mm x 500mm.

After the electrode plate in the electrochemical reactor is energized, a large number of hydroxyl radicals (OH) can be generated. The free radicals have strong oxidizing properties and can completely degrade the organic matter in the wastewater; the sediment and gas generated during the degradation process are filtered by the bag filter out. After the set experiment time of 1 hour, the results are listed in Table 1:

Table 1. Results and energy consumption of printing and dyeing wastewater from a certain factory after being treated by the utility model device

Compared with the prior art, the utility model has some unique advantages as follows: ① The device has reasonable design, large electrode plate area, high processing efficiency, small volume, and less time-consuming; The electrochemical oxidation process is well controlled; ③The boron-doped diamond electrode has a high oxygen evolution potential, which inhibits the occurrence of oxygen evolution side reactions, and is conducive to the generation of active intermediates with strong oxidizing ability such as hydroxyl radicals (OH), thus having Higher current efficiency, less energy consumption; ④ boron-doped diamond electrode, stable chemical performance, low adsorption, "self-cleaning" ability, long service life and low cost.

Description of drawings

Fig. 1 is the device schematic diagram of the present utility model.

In the figure, 1. Water storage tank, 2. Water pump, 3. Constant current and voltage stabilized power supply, 4. Automatic controller, 5. Electrochemical reactor, 6. Bag filter.

Detailed ways

The device and method of the present invention will be further described below in conjunction with specific embodiments.

The waste water first enters (1) the water storage tank, and is sent to (5) the electrochemical reactor through the (2) water pump; Strong oxidizing substances oxidize pollutants in the water, and then flow into (6) bag filter; due to the high concentration of pollutants in wastewater, it needs to be in (5) electrochemical reactor, (1) water storage tank, (6) bag filter Continuously circulate between them, after the online monitoring water quality reaches the standard, it will be controlled by (4) automatic controller, stop the circulation process, and discharge from (1) water storage tank.

Six 250x 500mm BDD boron-doped diamond electrodes are used as anodes, and six stainless steel electrodes of the same size are used as cathodes. The current density is 20mA·cm ^-2 . 1000L of wastewater from a printing and dyeing factory in the storage tank is pumped at a flow rate of 50L/min. , flows into the electrochemical reactor, the constant current regulated power supply provides a certain current and voltage to the electrochemical reactor, and generates strong oxidants such as hydroxyl radicals (OH) on the surface of the BDD electrode, which can effectively remove pollutants in wastewater. The treated water passes through the bag filter from the upper part of the reactor to remove sediment and suspended matter, and then flows into the water storage tank, so that it circulates continuously.

Claims (4)

1. with a device for electrochemical oxidation method treatment of dyeing and printing, it is characterized in that: device comprises aqua storage tank, water pump, constant current regulated power supply, electrochemical reactor, deep bed filter, two-position controller; Aqua storage tank, water pump, electrochemical reactor, deep bed filter connects successively; Electrochemical reactor comprises shell and electrode assemblie two portions, and wherein electrode assemblie is core apparatus, and with boron-doped diamond electrode for anode, stainless steel electrode is negative electrode; Anode and negative electrode parallel to each other, be vertically positioned in reactor.

2. the device for the treatment of of dyeing and printing according to claim 1, is characterized in that waste water constantly cycles through electrochemical reactor, deep bed filter and aqua storage tank within the time of setting.

3. the device for the treatment of of dyeing and printing according to claim 1, is characterized in that the water outlet of waste water after electrochemical oxidation flows through a deep bed filter, removing precipitation and suspended substance.

4. the device for the treatment of of dyeing and printing according to claim 1, is characterized in that the boron-doped diamond battery lead plate that electrochemical reactor inside is arranged is of a size of 250mmx500mm.