Electrochemical wastewater treatment method and device capable of continuously separating oil, water and residue

Abstract

The invention discloses an electrochemical wastewater treatment method and device capable of continuously separating oil, water and residue. The device adopts proposals such as physical absorption, electrochemical catalytic oxidization, flocculent precipitate, adopting a central partition, bottom sediment, three-layer mesh and the like, so as to realize a technology of combining dynamic water treatment and automatic oil, water and residue separation, reduce COD (Chemical Oxygen Demand), ammonia nitrogen and chrominance in coking wastewater (or other organic wastewater) furthest, and the device has a low power consumption and a good degradation effect, while the device is simple, and has a high treatment efficiency, a low preparation and operation cost and a good separation effect. While a plurality of identical devices can be connected together through pipelines (or grooves) to carry out multi-stage treatment to the wastewater, so that organic wastewater of high concentration or high difficulty can be easily degraded to meet the standard. Compared with biochemical treatment, the treatment method occupies a small area, has less investment and lower cost, and can work continuously and efficiently.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, in particular, it relates to a method and device for advanced treatment of refractory organic waste water, especially to an electrochemically assisted catalytic oxidation degrading coking waste water (or other waste water) which can continuously separate oil, water and slag. Organic wastewater) method and device. Background technique [0002] The chemical composition of coking wastewater is very complex, containing a large amount of ammonia nitrogen, sulfide, cyanide and a variety of biologically toxic organic pollutants. It has high chromaticity, high toxicity and is difficult to be biodegraded. In recent years, many inventors have developed various wastewater treatment devices and technologies through original designs and improved processes. New methods and technologies are constantly being used to treat coking wastewater, but each has its own advantages and disadvantages. The ...

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Problems solved by technology

[0002] The chemical composition of coking wastewater is very complex, containing a large amount of ammonia nitrogen, sulfide, cyanide and a variety of biologically toxic organic pollutants, high chroma, high toxicity and difficult to be biodegraded

In recent years, many inventors have developed various wastewater treatment devices and technologies through original designs and improved processes. New methods and technologies are constantly being used to treat coking wastewater, but each has its own advantages and disadvantages. The COD and ammonia nitrogen in the effluent and chromaticity are difficult to meet the national emission standards

In the current treatment process, the equipment and treatment methods used either occupy a large area, or the operation is complicated, the treatment efficiency is low, the energy consumption is high, or the cost is high, there is secondary pollution, or the comprehensive recycling effect is poor, such as: biological oxidation method Although the cost is low, it occupies a large area, and the concentration of COD and ammonia nitrogen in the effluent is high, so it is difficult to discharge up to the standard; activated carbon has a strong adsorption capacity because of its rich pore size distribution and large specific surface area. COD can be removed well, but it is easy to be saturated, the concentration of ammonia nitrogen in the effluent is high, and there are also problems such as difficult regeneration of the adsorbent and secondary pollution; in addition, the electrochemical oxidation technology proposed by some scholars in recent years because of its strong oxidative properties And the process is simple, no secondary pollution has attracted widespread attention, but it has certain limitations in application: there are not many types of electrodes, especially the lack of efficient and cheap electrodes, and the life of the electrodes is not long, energy consumption is large, and the cost is high

[0003] The common disadvantages of other existing oil-water slag separation technologies and devices are: the three-phase oil-water slag cannot be separated well, the structure is complex, the processing efficiency is low, the processing speed is slow, and the processing cost is high. After the shutdown, the device shell is manually removed, and then the internal cleaning process is carried out

The three-phase separator disclosed in the Chinese utility model patent "Three-phase High Efficiency Separator for Oil-Water Slag" (notification number CN2668218Y, published on January 5, 2005) adopts the gravity separation method to separate the oil-water slag in the wastewater. The disadvantages are : Fine oil particles are easier to discharge with water, and the same fine sediment is also easy to be brought out, and cannot be separated to a greater extent

However, the anode of the reactor is made of stainless steel plate, the anode area is small, the electrolysis voltage must be high to achieve a certain degradation rate, and the energy consumption is large; in addition, the simple stainless steel anode plate material corrodes quickly under the action of high-voltage direct current electrolysis, which affects the coking wastewater Continuous and efficient operation, complicated operation process and high cost

In addition, the oxygenation and aeration link is also easy to empty the toxic gas during the aeration process, causing secondary air pollution

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