Abstract: The advanced treatment using integrated Fenton's reaction and
coagulation process was investigated in this study. Before the advancement, the
pharmaceutical wastewater containing lincomycin hydrochloride was pretreated by
UASB (upflow anaerobic sludge bed) and a SBR (sequencing batch reactor)
process. The residual recalcitrant compounds, measured by gas
chromatographymass spectrometry (GC-MS), mainly consisted of alcohols, phenols,
and nitrogenous and sulfur compounds. The experimental results indicated that
when the Fenton's reaction was conducted at pH=3.0,
H_2O_2/COD_{Cr}=0.27,
H_2O_2/Fe^{2+}=3:1 and
30 min of reaction time, and the coagulation process operated at a sulfate
aluminum concentration of 800 mg/L and pH value of 5.0, the color and COD in
the wastewater decreased by 94% and 73%, respectively; with a finale COD
concentration of 267 mg/L and color level of 40 units, meeting the secondary
standard of GB8978-1996 for industrial wastewater.
