3.4. COD reduction limit of Z08 soybean wastewater treatment
Fig. 1 showed that COD reduction in Z08 wastewater treatment had a limit of around 300 mg/L. Such a COD degradation limit might be caused by a few reasons. First, high initial COD of soybean wastewater hindered its biodegradation since high organic load/biomass ratio (F/M) caused energy uncoupling between microorganism anabolism and catabolism (Liu et al., 1998).