Synergetic remediation of HCH-polluted sediments by the alkaline and ultrasonic activation of persulfate: performance and residual toxicity

CONTE, LEANDRO; CHECA-FERNANDEZ ALICIA; CARMEN DOMINGUEZ ; AURORA SANTOS

Crete

Congreso; 7th International Conference on Industrial and Hazardous Waste Management; 2021

The intensification of PS activated by alkali with US energy increases the efficiency of the degradation of HCHs in polluted sediments, favoring the desorption of the pollutants from the soil and increasing their oxidation rate. The application of US leads to an increase in the temperature of the system, which is also beneficial for the remediation process. Increasing the US power (from 0 to 165 W) and the initial concentration of PS (10-60 g/L), the degradation of HCHs and the hydrolisis products (TCBs) increases. Moreover, the dechlorination of HCHs was also favored, decreasing the concentration of chlorinated intermediate compounds. The oxidation process did not increase the ecotoxicity of the soil, facilitating a subsequent remediation treatment.