Treatment of organic wastewater from tomato paste processing by coupled aerobic-anaerobic process
A coupled aerobic-anaerobic process was designed for treating organic wastewater from tomato paste processing.The process was based on a combined reactor of suspended bed and fixed bed to couple aerobic and anaerobic treatment.The removal rates of COD_ Cr , BOD_5 and TP were 93.08%, 95.81% and 83.60% respectively.The pH reached 7.70.The effluent quality was not only up to the GB 18918—2002 Chinese National Second-Grade Effluent Standard, but also fit for recycling to tomato paste processing.After the coupled aerobic-anaerobic process was run for one year, the residual sludge was not discharged.