Effects of FeSO4and H2O2on earthed atomizing corona discharge technique for the styrene-butadiene rubber wastewater treatment

In this work, earthed atomizing corona discharge (EACD) technique was used to dispose wastewater produced during the manufacture of styrene-butadiene rubber. The effects of discharge time, volume of H2O2(VH2O2), and concentration of FeSO4(CFeSO4) on turbidity (Tb), pH value, biochemical oxygen demand (BOD5), chemical oxygen demand (COD), and the biodegradability of styrene–butadiene rubber wastewater (SBRW) was investigated using the EACD technique treatment process. After a cumulative EACD treatment for 21 min (i.e., three discharge cycles), the COD and Tbvalues of SBRW both decreased by 67% (from 600.8 to 200.0 mg L–1for COD and from 106.0 to 35.0 NTU for Tb). The pH value remained unchanged, while the BOD5value initially increased as the discharge time increased and then reached equilibrium. The COD value decreased subsequently to 80.0 mg L–1after a cumulative EACD treatment of 21 min when FeSO4was added. Meanwhile, the total decrease in the efficiency of the COD value was about 86.7%. However, the results show that H2O2had no impact on decreasing the COD value or improving the biodegradability. Therefore, the addition of FeSO4had a positive effect on decreasing the COD value for SBRW by cooperating with the EACD technique.