Indicator 2.6.16

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System

Water Type

Feed Dependent

Species

Indicator 2.6.16

by Contact on 8 October 2026

Requirement

The UoC shall use a treatment system prior to the discharge of effluent water that ensures: – ≥65% of Total Suspended Solids (TSS) are captured; and, – concentration of settleable solids in effluent water is <3.3ml/L.

How Do I Interpret This Requirement?

  • Methods to measure Total Suspended Solids (TSS) can be found in Appendix 8 (8.12).

  • Concentration of settleable solids (ml/L) can be measured by calculating the volume of solids that settles to the bottom of a conical cone (Imhoff cone) in one hour.

  • More sophisticated methods such as spectrophotometer readings can also be used to measure settable solids.

Evidence of Implementation

  • Details and location of the system used to treat effluent prior to discharge.

  • Evidence regular testing of TSS and settleable solids has taken place. Quarterly testing would demonstrate best practice.

  • Results from the testing of point source releases which demonstrate ≥65% of TSS are captured and the concentration of settleable solids in effluent water is consistently <3.3ml/L.

Auditors Should Confirm

  • A treatment is in place and located prior to the point of discharge.

  • Results of testing from the UoC which confirm the treatment system captures ≥65% of suspended solids and that the concentration of settleable solids in effluent water is <3.3ml/L.