Guidelines for reduction of dyes released from pulp and paper mills 2013: appendix 2

Appendix 2: Calculation of Solids Removal Efficiency by the Primary Treatment System

Where

ESS = solids removal efficiency (%)
SS_o = solids concentration at the outlet of the primary treatment system (mg/L)
SS_I = solids concentration at the inlet of the primary treatment system (mg/L)

Note: The sampling should be conducted while the primary treatment system is stable and the mill is in operation.