COD characterisation of a large treatment works catchment

Proceedings

COD characterisation of a large treatment works catchment

Shortland, G.J.A., Black, J., United Utilities, UK PRESENTATION ONLY
(free)

Background • Sources of COD (Cheimical Oxygen Demand) within the catchment • Analysis of COD data

Background

• Upgrading a large wastewater treatment works (FTFT 346 Ml/d) with a UWWTD COD consent of 125 mg/l or 70% removal.

• Catchment in the order of 600,000 p.e. (for COD)

• In order to ensure robust compliance after the upgrade, an understanding of the hard COD sources, and their potential impact on final effluent quality, was required.

• Hard COD is soluble COD, which is hard to treat by biological processes.

Structure of the Investigation Based around four questions:

• How much hard COD was entering the works?

• How did this compare with the level in a predominantly domestic wastewater treatment works?

• What was the potential impact on final effluent quality?

• Could the hard COD detected entering the works, be attributed to particular sources in the catchment?

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