In general, mills producing recycled paperboard, containerboard, tissue and fine paper discharge less biochemical oxygen demand (BOD) and total suspended solids (TSS) than virgin mills making comparable products. The differences between virgin and recycled newsprint mills, however, are not significant.
With few exceptions, the wastewaters from mills in North America are treated before being discharged. This diminishes differences in BOD and TSS loads between mill types. COD (Chemical Oxygen Demand) is less treatable than BOD and as a result, the differences between production categories tend to be larger for COD than for BOD.
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