The problems and technical keys of ultrasonic regeneration activated carbon

With the development of science, activated carbon is becoming more and more widely used, and with the country's attention to the ecological environment, activated carbon is also playing an increasingly important role. With the expansion of the use of activated carbon, the demand for activated carbon is also increasing. A large number of activated carbon is used, but it is faced with the problem of how to regenerate saturated activated carbon simply and effectively.

There are many processes used in activated carbon desorption and regeneration, but no matter which process, there are shortcomings such as complex desorption process, difficult regeneration and high treatment cost, and activated carbon ultrasonic desorption technology is developed to overcome these shortcomings. The activated carbon ultrasonic desorption technology developed by our company is to use the physical and chemical properties of ultrasonic waves to wash and desorb activated carbon to achieve the purpose of activated carbon regeneration and reuse. 1. Process characteristics 1. Low investment and low operating cost According to our engineering results, the cost of sewage treated by ultrasonic radiation activation technology is extremely low, which is about 2% of the traditional process.

2. Easy to operate, short regeneration cycle due to the use of in-tower regeneration process, no need for material transfer, coupled with the short ultrasonic desorption cycle (a cycle is not more than two hours), it can achieve non-stop regeneration, and there is no mechanical loss of carbon particles, and the loss rate is <10% per year. 3. High desorption efficiency, and at the same time, due to the "acoustic cavitation" effect of ultrasound, the original small gap of activated carbon is expanded, the specific surface area of activated carbon is expanded, and the adsorption capacity of activated carbon is improved. Due to the action of free radical oxidation and ultrasonic resonance, the adsorption efficiency of activated carbon after activation is 95-130% of that of new carbon.

2. Scope of application of the process 1. This process is especially suitable for the regeneration and desorption of saturated activated carbon of various adsorbed organic substances. 2. This process is also suitable for the regeneration of various inorganic anionic and cationic saturated carbons that are easy to be adsorbed by activated carbon. Process adaptability 3. This process technology is suitable for the regeneration and desorption of saturated carbon adsorbed organic matter, and the test and detection of desorption efficiency should be carried out before process selection for saturated activated carbon regeneration of adsorbed inorganic matter.

4. This process is only suitable for granular activated carbon, and cannot be used for the desorption and regeneration of activated carbon and activated carbon fiber. Technical Provider: Nanjing Kehuan Environmental System Engineering **** Contact:

Ultrasonic refers to a method that uses the pulsation of ultrasonic waves to stir the activated carbon, and the impact of the bursting of the "cavitation bubble" to promote the rapid desorption of the adsorbate to achieve the regeneration effect. The biggest feature of ultrasonic regeneration is that the purpose of regeneration can be achieved by only applying energy locally, so the applied energy is very small. Ultrasonic regeneration has low energy consumption, simple process and equipment, small loss of activated carbon, low self-water consumption, and can be useful substances.

The regeneration efficiency of the ultrasonic regeneration method mainly depends on the ultrasonic action time, activated carbon particle size, adsorption type and other factors. The regeneration rate will increase accordingly when the action time is prolonged, but when the time reaches a certain level, the parts of the surface layer that are more prone to ultrasonic "cavitation" basically reach a new equilibrium, and the desorption rate does not increase significantly. It is difficult for ultrasonic waves to act into the activated carbon through micropores less than 10nm, and its "cavitation" effect mainly occurs on the surface of activated carbon and in macropores, and the smaller the particle size of activated carbon, the higher the regeneration rate.

However, when the particle size is small to a certain extent, it will be difficult to quickly separate the carbon particles and the recycled waste liquid, and at the same time, it will be limited by the water flow resistance and recoil loss.