The principle of electrical floating oil removal and sterilization is that during wastewater electrolysis, due to the electrolysis of water and the electrolytic oxidation of organic matter Gas generated on the cathode surface (For example, H2,02, C102, C12, etc. form small bubbles that can adhere to impurities and oil particles in the water and float to the surface during the rising process, thereby removing suspended solids and oil. During electrolysis, not only do bubbles float up, but they also have functions such as coagulation, co precipitation, electrochemical oxidation, and electrochemical reduction. Under the action of a direct current electric field, wastewater is electrolyzed, and 02 and C12 are separated at the anode, while H2 is separated at the cathode. The bubble size produced by electrolysis is very small and its density is high.) Also small (as shown in Table 1). Microbubbles have a high specific surface area and can adsorb small oil droplets and suspended solids in water. As the density of microbubbles is only a few hundred to a few thousand times that of water, it is easy to separate oil droplets and suspended solids from the water and remove them. Therefore, the ability of electrolytic bubbles to intercept impurities and particles is higher than that of dissolved air flotation and mechanical impeller air flotation, and the floating capacity is also higher. When using commonly used electrical flotation methods for wastewater treatment, the main focus is on removing suspended and oily substances in the wastewater. In fact, during electrical flotation, due to a series of electrode reactions, the anode also has the functions of reducing BD and COD, decolorization, deodorization, and disinfection. The cathode also has the ability to deposit heavy metal ions
1. Through structural design, the electrolysis reaction and flocculation air flotation separation process are completed in the same reactor, forming an integrated equipment of electrocoagulation air flotation. The equipment consists of a water distribution area, electrolysis area, air flotation separation area, sedimentation separation area, and effluent area.
2. The water distribution area is located at the lower part of the electrolysis area, with the aim of ensuring that wastewater evenly enters the electrolysis area and preventing short flow phenomena. This equipment adopts a high resistance water distribution system, which consists of a series of lower perforated water distribution pipes. Through the water distribution system, it is ensured that the wastewater is evenly distributed across the entire cross-section of the water distribution area and then flows upwards into the electrolysis zone.
3. The electrolysis zone is composed of a series of parallel metal electrodes. When the electrode is subjected to direct current, the anode will dissolve to produce a large number of metal ions and further hydrolyze to form metal hydroxide flocs; The cathode, on the other hand, will release a large number of small bubbles, thereby achieving electrolytic flocculation and air flotation functions. The electrode spacing and relative position are determined through the electrode fixing frame. The metal electrode plate with electrode card slots on the electrode fixing frame can be fixed by inserting the electrode card slot positions of the upper and lower electrode fixing frames.
The electrode fixing bracket is a strip shaped bracket processed from engineering plastics such as PVC, PPR, or polytetrafluoroethylene, with a series of grooves with a certain spacing milled on it, namely the electrode card slot. The electrode fixing bracket can be welded or bolted to the reactor wall, with two upper and two lower walls on each side, and the electrode card slots aligned up and down. The width of the electrode slot can be slightly larger than the thickness of the electrode, and the metal plate electrode can be smoothly inserted and removed.
The electrode connection method can be selected as either single pole or bipolar according to the actual situation and customer requirements. Using bipolar connection can not only effectively reduce equipment investment and operating energy consumption, but also achieve free insertion and removal of electrodes, reducing the labor intensity of operation and maintenance. The electrode spacing can be simply adjusted by adjusting the distance between the electrode slots on the electrode holder.
The electrode is connected to the DC power supply through cables or copper bars. The DC power supply can use linear DC regulated power supply or pulse DC power supply. The power supply requires the function of reversing the positive and negative poles, and the positive and negative poles are reversed every 30 seconds to 1800 seconds, so that the electrode surface alternates with anode and cathode reactions, effectively preventing electrode passivation
4. The air flotation separation zone is located in the upper part of the electrolysis zone, and the wastewater after electrolysis flows upwards into the air flotation separation zone. In the air flotation separation zone, the metal ions generated by electrolysis and the hydroxides generated by hydrolysis form a large number of flocs through coagulation with suspended particles, colloids, dyes, and surfactants in the printing and dyeing wastewater. These flocs further combine with a large number of small bubbles precipitated from the cathode to form a three-phase particle system with an apparent density less than water. During the horizontal movement of the wastewater towards the end of the reactor, these particles will float to the water surface, and the wastewater will be clarified. The scum on the water surface is collected into the slag storage tank by a scraper located at the top of the pool. When the scum in the storage tank accumulates to a certain amount, it can be discharged through the slag discharge pipe.
5. The sedimentation separation zone is located at the lower part of the air flotation separation zone to precipitate and separate dense flocs and particles. The bottom of the sedimentation separation zone is equipped with a sediment collection plate with a certain slope. When the sediment accumulates to a certain thickness, it will automatically slide into the bottom of the tank and be discharged through a sludge discharge pipe located at the bottom.
6. The outlet area is located at the end of the reactor and consists of an overflow weir, a collection tank, and a drainage pipe. A baffle is installed at the front end of the water outlet area to prevent scum from being discharged with the water. The wastewater that has been clarified through air flotation and sedimentation separation flows into the collection tank through the overflow weir, and is finally discharged by the drainage pipe. The depth of the baffle at the front end of the outlet area that extends below the water surface should be appropriate and not too shallow to prevent the scum from being driven by the water flow and discharged with the water. The overflow weir is made of triangular or rectangular weirs, processed with plastic or metal sheets, and has waist holes on the weir body, which are fixed on the reactor tank wall with bolts to adjust the level and up and down positions, Ensure uniform effluent and adjust the liquid level in the tank.
Applicable scope and wide application: domestic sewage, factory sewage, industrial sewage, textile printing and dyeing, slaughterhouse sewage, aquaculture sewage, etc.
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