The degradation of DBS by sonochemstry

Ultrasonic waves of frequency 1.8MHz,intensity of rougrly 5W^-2were used to treat DBS solution of concentration ranging 0.2--4.0/Lin asono-chemical reactor. The experimental results show that changes ofconcentration of DBS haveno influence on TOC removal rate. ln basicsolution(PH=13), no degradation appears, while in acidc solution(PH=3),the TOC removal rate reaches upto 10%.The intermediate products wereanalysed by using ultraviolet spectrum scanned in the 190--320nm range,and were found to include piecesof broken chain of hydrocarbon and nitricbenzene. The degradation mechanism were also analysed. we believe that thesurface active regents in solution could reduce the sarface tension of theconcerned liquid and thus weaken the generatien of cavitation in thesolution to cause the low removal rate of TOC.