Abstract: Experiment on microbial degradation with two kinds of biological
process, hydrolytic acidification-aerobic process and aerobic process was
conducted to treat the anthraquinone dye wastewater with
COD_{Cr} concentration of 400 mg/L and chroma 800. The
experimental result demonstrated that the hydrolytic-aerobic process could
raise the biodegradability of anthraquinone dye wastewater effectively. The
effluent COD_{Cr} can reach 120–170 mg/L and chroma
150 which is superior to that from simple aerobic process.