Experimental Study Of Ultrasonic Regeneration Of Activated Carbon

In recent years, the economy of China has rapidly developed, while the treatment speedof urban sewage and industrial wastewater can’t catch up with the rapid pace of economicdevelopment. As an adsorption material of good quality, activated carbon possesses goodadsorption performance for its rich pore structure and huge surface area, additionally it iswidely used in the field of water treatment for its characteristics of strong intensity, lessreadily corrode by substances such as acid and alkali. However, the increasing usage ofactivated carbon followed by some regeneration of activated carbon issue. Because of thehigh price of activated carbon, using it just for once and discarding will result in a huge wasteof resources and secondary pollution problem. Researchers did a lot of research on activatedcarbon regeneration putting forward many practical and effective methods such as thermalregeneration, biological regeneration and microwave irradiation regeneration, but found thatthere are many problems in the practical application such as the high cost of regeneration, lowregeneration efficiency, great carbon loss when regenerating and unable to popularize inindustry. This paper puts forward ultrasonic regeneration to process activated carbonadsorption saturation. Select organic phenol and heavy metal nickel which are representativematerial as adsorbent under the laboratory condition, with static and dynamic methodrespectively or with the combination of dynamic and static adsorption method to let theactivated carbon as much as possible reach the balance point of adsorption. Study the factorsaffecting the effect of activated carbon regeneration through the regeneration experiment withultrasonic method. To explore a set of economically feasible ultrasonic regenerationinstrument through reforming the ultrasonic instrument and doing ultrasonic regenerationresearch respectively by single frequency and dual-frequency ultrasonic method. Preliminaryprobe to the mechanism of ultrasonic regeneration of activated carbon provides theoreticalbasis for feasibility of the technology of ultrasonic regeneration of activated, economicrationality of technological popularization and practical engineering applications. The probealso lays the laboratory foundation for the ultrasonic activated carbon regeneration technologypromotion and makes its own contribution to saving resources, environmental protection andthe field of water treatment.Experimental study on the effect ultrasonic has on surfacefunctional groups of activated carbon shows that ultrasonic has little effect and ultrasoniceffect did not have a substantial change for the structure of activated carbon. on regenerationof activated carbon adsorption nickel by ultrasound showed that the ultrasonic effect ofactivated carbon adsorption Nickel saturation has certain regenerative effect while the effectis not obvious, the desorption rate was only15.75%. Experiment on ultrasonic regeneration ofactivated carbon adsorption of phenol studies regenerative effect of ultrasonic regeneration of phenol saturated activated carbon adsorption regeneration from the following aspects whenultrasonic regenerating—ultrasonic time, temperature of regenerated liquid, type change ofregenerated liquid, change frequency of regenerated liquid, single frequency ultrasonicfrequency change，combination of dual-frequency change. Then finalize the optimum time forultrasonic regeneration is20min, ultrasonic effects is best when temperature of regeneratedliquid is30℃, ultrasonic regeneration effect also have obvious improve on condition thatultrasonic regenerated liquid is sodium hydroxide solution whose concentration is0.25mol/Land ultrasonic effect is best under45KHz double-frequency composition.Through exploration and experiment on ultrasonic generators device, we found thatultrasonic generator would have great influence on the effects of ultrasonic regeneration. Forthis reason, we improve the ultrasonic generator device based on the research of it.Experimental validation shows that the ultrasonic generator will produce different ultrasonicsound field when it is located in different parts of the ultrasonic reaction device and differentultrasonic sound field has different effects on ultrasonic regeneration of active carbondesorption. Experiments show that regeneration efficiency the ultrasonic regeneration toactivated carbon under45KHz double-frequency effect can be increased by five percentwhen ultrasonic generator which located in the ortho position of ultrasonic reactor. Whilepaper from saturated activated carbon respectively, ultrasonic regeneration experiments forthe preparation of the influencing factors, complexity of activated carbon adsorption ofpollutants, the influence of the ultrasonic generator is installed the regeneration effect, carbonlosses, ultrasonic regeneration mechanism and so on several aspects of this subject thesis isinsufficient and needs to be the direction of development.Meanwhile, this paper puts forward shortages exist in the paper and presents whatdevelopmental direction need to be from many aspects such as preparation of saturated activecarbon, the influence factors of ultrasonic regeneration experiment, complexity of adsorptionactivated carbon to pollutants, influence installation location of ultrasonic generator have onregenerated effects, loss of carbon and ultrasonic regeneration mechanism.