Method for removing cyanide through basic Fenton reaction by utilizing ultrasonic catalysis

Abstract

The invention relates to a method for removing cyanide through a basic Fenton reaction by utilizing ultrasonic catalysis. The method comprises the following specific steps: (1) adding an enough amount of activated carbon powder into waste water, wherein the addition amount of the activated carbon powder is 0.7 weight percent of the weight of the waste water; (2) after the activated carbon powder adsorbs a great number of impurities in the water, filtering the waste water, and then injecting the waste water into an ultrasonic reactor; (3) performing ultrasonic crushing reaction, wherein the sound energy density of an ultrasonic wave is 0.1-0.3 w / m<3>; (4) after the reaction is performed for 20-40 minutes, adding ferrous ion salt and H2O2 into the ultrasonic reactor, adjusting the PH value to be 8-10, adding a copper oxide as a catalyst, and performing stirring; (5) after the stirring is performed for 2-3 hours, performing sedimentation after the reaction is completed so as to separate the solid liquid and treat the waste water. The method has the advantage that the cyanide in sewage can be more effectively removed by performing ultrasonic treatment and then adding the copper oxide into the basic Fenton reaction.

Description

technical field [0001] The invention relates to the basic Fenton reaction, in particular to a method for removing cyanide through the basic Fenton reaction catalyzed by ultrasonic waves. Background technique [0002] In the treatment of water resources and environment, wastewater can be treated by ultrasonic waves. The cavitation effect of ultrasonic waves provides the possibility of degrading harmful organic substances in water, so that the purpose of ultrasonic sewage treatment can be realized. In the process of sewage treatment, ultrasonic cavitation has a strong ability to degrade organic matter, and the degradation speed is very fast. The high energy generated by the collapse of ultrasonic cavitation bubbles is enough to break chemical bonds, and the collapse of cavitation bubbles produces hydroxyl groups ( Oh + ) and hydrogen radicals (H - ), and the oxidation reaction with organic matter can convert harmful organic matter in water into CO 2 、H 2 O, inorganic ions...

AI Technical Summary

Problems solved by technology

[0014] Known existing technologies such as: Application No.: 201310678092.4 and 201210286680.9 respectively provide the method of ultrasonic wave and Fenton reaction synergistic treatment of wastewater, which is proposed in 201310678092.4 The Fenton reaction and the ultrasonic crushing reaction are carried out at the same time. The method proposed in the 201210286680.9 is to first add FeCl2 and H2O2Carry out Fenton oxidation, and then perform ultrasonic crushing reaction, but the above two technologies do not make full use of the large number of hydroxyl groups (OH+ produced in wastewater after ultrasonic crushing reaction for a period of time ) and hydrogen radicals (H-) may have a facilitative effect on the Fenton oxidation technique