一 .Summary:

The electro-catalytic oxidation treatment of wastewater has the advantages of rapid reaction rate, high decolorization rate, minimal production of mud, easy management, and easy realization of automatic control. Under electrochemical conditions, it can change the physical and chemical properties of pollutants in sewage, convert organic substances into carbon dioxide and water, make the wastewater harmless, and at the same time, when the concentration of pollutants in the influent water changes, It can be controlled by adjusting voltage and current to ensure stable water discharge. Compared with other processing methods, it has the advantages of short processing time, small equipment volume, and less space and etc. The traditional electrolysis method has many disadvantages, such as high electricity consumption and large consumption of electrode materials, so it has not been widely used in industry.

The equipment of electro catalytic oxidation is a new equipment developed by our company, which deals with printing and dyeing wastewater, dyestuff production wastewater, electroplating wastewater and other waste water. In recent years, the domestic printing and dyeing water treatment widely used this equipment to obtain huge environmental and economic benefits.

SMJ electrocatalytic oxidation equipment is the ideal equipment for industrial waste water and wastewater treatment such as printing, dyeing, electroplating and agrochemical industries, especially for the effective treatment of high salt wastewater.

二．Usage:

Suitable for waste water treatment in printing, dyeing, dyestuff, chemical industry, hospital (have special effect on killing bacteria) leather, electroplating and so on),

such as:

1. The degradation of COD in waste water. The new COD can be less than 50 mg/L.

2. The decolorization of waste water,  The chroma can be below 15 times

3. The rapid treatment of the ammonia and nitrogen for high content ammonia nitrogen wastewater.There will be no ammonia and nitrogen can be  detected.

4. Rapid treatment of aniline, phenolic aromatic compounds.

5. For larget amount of industrial wastewater such as Printing industrial, dyeing, industrial,papermaking and others treatment and reuse.

6. domestic wastewater's COD degradate and rapid non-selective killing of bacteria and flavor removal.

7. hospital wastewater's COD degradate and rapid non-selective killing of bacteria and flavor removal.

8. Standard treatment of wastewater after biochemical treatment.

9. High efficiency treatment of refractory chemical wastewater.

10. The industrial zone sewage treatment plant wastewater pretreatment, enhances the biochemistry, greatly enhances the biochemistry efficiency.

11. Standard treatment of high salt wastewater.

12. Oxidation of electroplating wastewater cyanide, heavy metal recovery.

The device'advantages: advanced technology, reasonable design, low investment, strong randomness of use, good treatment effect, low operating cost, simple use and maintenance, etc.

 

三．the working principle:

The equipment consists of a power control cabinet, an electrocatalytic oxidation reactor, a settler, a filter, etc. The specific scheme is determined based on the water quality experiment.

The device is rectified by means of external processing frequency current and becomes a direct current, and then becomes a continuously adjustable rectangular pulse current input through the pulse circuit. In the positive and negative poles of the electrolyzer, the wastewater in the electrolyzer is oxidized and electrochemical reactions occur near the electrode plates, which play the following roles:

(1) Electrochemical reactions occur on both sides of the plate, and the electrolysis of wastewater produces active hydrogen and active oxygen. Hydroxyl radicals, active hydrogen and active oxygen have strong oxidation and reduction effects. The active hydrogen decolorizes the dyeing substances in the oxidation state of wastewater. Hydroxyl radicals and reactive oxygen species oxidize and decompose dissolved organic matter in the waste water, turning the organic matter into carbon dioxide and water, rendering it harmless.

(2) After the oxidation reaction, the active hydrogen and active oxygen are changed into hydrogen gas and oxygen gas, and they escape in the wastewater with very fine bubbles and adhere to the surface of insoluble substances to achieve the effect of purifying and purifying water.

Electrocatalytic oxidation of organic pollutants, first, the organic matter directly on the surface of the electrode occurs indirect oxidation reaction, and ultimately generate carbon dioxide and water removal, the device to deal with pollutants in two ways: First, the organic material is directly oxidized on the anode . Second, the occurrence of organic radicals on the surface of the fixed bed catalytic filler and the organic material on the surface of the filler occurs during the electrolysis process. The free radical chain reaction is initiated, the organic matter is decomposed into carbon dioxide and water, or the organic matter is easily degradable, which is convenient for centralized sewage treatment. Plant biological treatment. For example, aromas are oxidized and opened to fatty acids. Further simple and economic flocculation treatment can achieve the desired treatment effect.

HO• radicals are strong oxidants with high oxidation activity. The oxidation of organics is carried out in three ways: dehydrogenation, electrophilic reactions, and electron transfer reactions to form activated organic radicals, making them easier to oxidize. Organic compounds or organic free radicals react so that organics can degrade rapidly. The process of degradation of aromatic compounds by hydroxyl radicals is now taken as an example to illustrate the process of molecular oxidative degradation. The degradation of the molecule has undergone roughly three stages: organic substances first diffuse to the surface of the electrode, undergo surface adsorption, and hydroxylation occurs first at the surface. Aromatic ring intermediates, this one process reacts very quickly, followed by the oxidation of intermediate products to small molecules by free radicals. This process is relatively slow, and electrochemical combustion occurs eventually, producing carbon dioxide and water.

 

The equipment can integrate oxidation, reduction, flotation, precipitation, and filtration functions, achieving multi-functionalization and achieving superior technical indicators of extremely small equipment, high efficiency, and low cost.

 

四 ,Main technical indicators.

1,Installation and purification capacity.

The daily treatment water volume is 10-5000m3/h, and the water outlet reaches the national emission standard. The water quality is clear and transparent, and the design can be designed according to the removal rate of COD and chroma, and the minimum can reach below 50 mg/L.

2,Average reference power consumption:

Influent CODcr<500mg/L power consumption < 0.5kwh/T wastewater

Influent CODcr<500~1000mg/L Power Consumption <1.0kwh/T Wastewater

Influent CODcr<1000~3000mg/L Power Consumption <1.5kwh/T Wastewater

Increase pump power consumption 0.08~0.1kwh/T wastewater

Fifth, size: According to the actual water quality and water requirements design.

Six, equipment installation: on-site assembly.

Seven, the use of precautions and maintenance points

1. When using this equipment, it must be reliably grounded to ensure the safety of operators. Ground resistance should be <1 ohm.

2. Installation of pipelines: In and out water pipes of electrolyzers, hard PVC pipes must be used for the sewage pipes, and galvanized pipe for the precipitator water pipes and sewage pipes.