EFCT: Environmental Footprint Comparison Tool.  A tool for understanding environmental decisions related to the forest products industry.  BOD/COD/TSS. headerlink
Effects of decreased release of B O D / C O D and T S S on solid waste

Efforts to reduce discharges of BOD/COD and TSS to water either through source reduction or wastewater treatment can have co-benefits with respect to solid waste generated during the treatment of wastewater. Reducing the losses of solid raw materials decreases the amount of primary residuals that must be managed at wastewater treatment systems. Reducing the losses of organic materials (measured as biochemical oxygen demand, BOD) will reduce the amount of biosolids generated and removed during activated sludge treatment and, to a much lesser extent, the accumulation of biomass residues in treatment pond systems.

Conversely, reducing discharges to water through the installation of additional treatment system capacity or technology is likely to increase the amount of solid residuals that must be handled and managed. This trade-off is particularly acute for tertiary treatment systems that use coagulation or physical separation techniques to remove suspended particulate, or colloidal or soluble matter from wastewaters prior to discharge.

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More information:

Effect of source reduction

Effect of incremental treatment