Reported data on the chemical oxygen demand (COD) fractions and kinetic parameters for the pulp and paper mill wastewater are scarce. The present study evaluates the treatability of a paper mill effluent using a laboratory scale sequencing batch reactor. Kinetic parameters associated with carbon and nitrogen removal were determined experimentally, and the activated sludge model (ASM) was used to estimate the COD fractions of the paper mill wastewater and to assess the model sensitivity to kinetic parameters. Experimental tests demonstrated removal efficiencies reaching 92.9%, 88.5%, 91.5%, and 96.4% for COD, biological oxygen demand (BOD5), total suspended solids (TSS), and total nitrogen (Total N), respectively. Incorporating anoxic sequences and operating at 35°C improved total N and phenol removal efficiencies. Few kinetic parameters were found to be similar to those reported for domestic wastewater treatment systems. Based on ASM1 simulations, the COD fractions were estimated at 0.33, 0.28, 0.05, and 0.34 for the nonbiodegradable soluble COD (SI), the readily biodegradable soluble COD (SS), the nonbiodegradable particulate COD (XI), and the slowly biodegradable particulate and colloidal COD (XS), respectively. Simulated total COD was sensitive to the heterotrophic yield and maximum specific growth rate.
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