SOLIDS

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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