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

Appendix 2: Calculation of solids removal efficiency by the primary wastewater treatment

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.