Severn Trent choose te-ion oxidation treatment to reduce sludge bulking 18 August 2022

Severn Trent has awarded Te-Tech a contract to install te-ion at its Chipping Campden wastewater treatment works.

Like many activated sludge plants, Chipping Campden suffers from severe sludge bulking: that is poor sludge settleability and high suspended solids in the final effluent during the summer period.

The usual remedy is adding chemicals – nutrients, polyelectrolytes and selected bacteria supplements. But there’s another way.

Filamentous bacteria that cause sludge bulking are particularly susceptible to reactive oxygen species like peroxide, ozone and free hydroxyl radicals. The te-ion advanced oxidation process destroys the bacteria selectively, without the use of chemicals, by passing some of the aeration air through an electrical glow discharge, generating a non-thermal plasma which contains a wide range of reactive oxygen species. The plasma containing the reactive oxygen species is introduced into the aeration reactor along with the aeration air, via the diffuser system. The active oxygen destroys the bacteria and dramatically reduces sludge bulking without affecting the biological treatment process.

Design is underway and the project is on schedule for delivery and installation at the end of September and handover at the beginning of October.

Operations Engineer

Related Companies
Severn Trent Water

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