EFFECT OF PHENOL ADDITION ON COD AND SULFATE REMOVAL IN AN EGSB REACTOR

摘要

In this paper, the effect of phenol addition on Chemical Oxygen Demand (COD) and sulfate removal in an expanded granular sludge bed (EGSB) reactor was investigated. A bench-scale EGSB reactor with 8.5 L was tested to treat the phenol-sulfate-containing wastewater (PSW). The reactor has been operated continuously at 95 °F for 340 days. The objective of this study was to investigate the inhibition effect of phenol on the COD and sulfate removal by gradually increasing its concentration in the feed. Results indicated that anaerobic treatment of sulfate waste-water is feasible with the addition of phenol. Sulfate removal was 78%, with 84% COD removal at a phenol degradation rate of 0.434 kg/(m~3·day). The organic load rate (OLR) of the reactor was 6.9 kg COD/(m~3·day), and hydraulic retention time (HRT) was 24 h at high phenol concentration (550 mg/L). The results showed that the EGSB reactor had a good performance in terms of COD, sulfate and phenol removal. On the whole, the system exhibited good stability in terms of operation. The results presented in this paper supply a technically feasible way for simultaneous removal of sulfate and phenol from wastewater by EGSB.