When solids are referred to in terms of water treatment, it means any insoluble contaminants, other than fats, oils and greases.

Solids are another parameter that will always appear on a trade effluent discharge consent which must be met to avoid potential prosecution and associated fines. They are also the third part of the MOGDEN formula – the method used to calculate your trade effluent charges when discharging to a water company – along with volume and COD.

Therefore, reducing solids to meet consent has a direct cost saving against the MOGDEN formula – this is how we can help you meet consent whilst generating a return on investment!

There are a number of different types of solids which may appear on your trade effluent consent to discharge:

  • Total Suspended Solids, TSS – all solids present
  • Settleable solids – solids that sink and do not appear in the top water when tested after the sample has been stood for 60 minutes
  • Rapidly settleable solids – as above but the time frame is often 5 to 15 minutes
  • Unsettleable solids – the element of solids that remain floating around a sample of trade effluent that has been stood for 60 minutes
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