Chemical Oxygen Demand Fractionation and Kinetic Parameters for Sequencing Batch Reactors Treating Paper Mill Wastewater

摘要

Reported data on the chemical oxygen demand (COD) fractions and kinetic parameters for the pulp and papernmill wastewater are scarce. The present study evaluates the treatability of a paper mill effluent using a laboratorynscale sequencing batch reactor. Kinetic parameters associated with carbon and nitrogen removal were determinednexperimentally, and the activated sludge model (ASM) was used to estimate the COD fractions of thenpaper mill wastewater and to assess the model sensitivity to kinetic parameters. Experimental tests demonstratednremoval efficiencies reaching 92.9%, 88.5%, 91.5%, and 96.4% for COD, biological oxygen demandn(BOD5), total suspended solids (TSS), and total nitrogen (Total N), respectively. Incorporating anoxic sequencesnand operating at 35u0002C improved total N and phenol removal efficiencies. Few kinetic parameters were found tonbe similar to those reported for domestic wastewater treatment systems. Based on ASM1 simulations, the CODnfractions were estimated at 0.33, 0.28, 0.05, and 0.34 for the nonbiodegradable soluble COD (SI), the readilynbiodegradable soluble COD (SS), the nonbiodegradable particulate COD (XI), and the slowly biodegradablenparticulate and colloidal COD (XS), respectively. Simulated total COD was sensitive to the heterotrophic yieldnand maximum specific growth rate.