Sample Initial DO (mg/L) Final DO(mg/L) BOD
Control 9.50 6.00 350
A (40KHz) 8.90 5.85 325
B (40KHz) 8.50 5.80 265
C (40KHz) 8.40 5.75 255
A1(140KHz) 7.40 6.50 220
B1(140KHz) 7.25 6.00 200
C1(140KHz) 7.20 5.60 190
Table 3: Dissolved oxygen of sonicated wastewater after 5 days incubation.