Treating Starch Wastewater Reclaim Bioenergy by EGSB Process and High Value Use of Biogas

摘要

The expanded granular sludge bed (EGSB) reactor-anoxic/aerobic (A/O) process has been used for treating highly concentrated starch wastewater, and the biogas produced in EGSB was purified. Under the condition of 35 °C, the COD volume load of EGSB reaches up to 20kg/(m~3·d), and the combined process removal rates of COD,BOD_5 and SS were 98.5%,99.5% and 95%, respectively. After being treated by the combined process, the effluent quality is able to satisfy the demands of discharge. After purification treatment, the methane content of biogas was high than 98%, and the hydrogen sulfide content was below 30 mg/Nm~3. The natural gas production was 6000m~3/d, the high value use of biogas was achieved.