Effect of ultrasonic treatment on the sorption properties of the pyrolysis product of sludge

Abstract

© 2019 IOP Publishing Ltd. In the article, the object of the study is a sorption material obtained by low-temperature pyrolysis from a sludge of a biological sewage treatment, and processed by ultrasound. Ultrasonic treatment is one of the methods for improving sorption characteristics by increasing the specific surface area. The adsorption capacity of pyrolysis products by methylene blue on a UNICO 2800 spectrophotometer and iodine by the titrimetric method was studied. An increase in sorption activity after ultrasonic treatment on the sorption material was found: by 2.3 times for methylene blue, 2.5 times for iodine. Sorption properties with respect to iron, copper, nickel, and zinc ions under static conditions using the atomic-emission spectrometry method with inductively coupled plasma on the Agilent 720-OES spectrometer were studied. The degree of extraction of heavy metal ions using the pyrolysis product of sludge after ultrasonic treatment reaches: for Fe - 98.7%, Ni - 84.4%, Cu - 90.5%, and Zn - 95.2%. Ultrasonic treatment with a frequency of 35 kHz for 30 minutes allows to increase the sorption capacity of the product of pyrolysis of mud sediments by Ni ions by 2.4 times, Cu - 1.2 times, Zn - 1.7 times..