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 (%)
- SSo = solids concentration at the outlet of the primary treatment system (mg/L)
- SSI = 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.
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