Proceedings

Successful commissioning of Basingstoke STW DEMON® liquor treatment plant

Inkpin, L.1, Madden, G.2, Merry, J.3, Fountain, P.4, 1Lee Inkpin Ltd, UK, 2Techelec, UK, 3Stantec, UK, 4Thames Water, UK

(free)

In this paper the commissioning of Basingstoke DEMON® Liquor Treatment Plant (LTP) is discussed.  We will explore why the DEMON process was adopted, the design, commissioning phase and issues encountered as well as how they were overcome and any process implications that followed.

Introduction
Installation of a 53tDS/d Cambi THP stream has allowed Basingstoke STW to become a Sludge Treatment Centre. However, as indigenous sludge represents only 25% of the THP design load with the remaining 75% being imported, liquor treatment was required to maintain compliance with the tight effluent ammonia consent (1mg/l NH4-N). A DEMON® liquor treatment plant was selected because it could achieve a high degree of ammonia and nitrogen removal with relatively low running costs due to reduced aeration and no additional carbon source.

A single reactor was installed to provide treatment for design loads of up to 1093 kgNH4-N/d. Postdigestion dewatering liquors were diluted and heated to ensure optimum conditions for anammox and ammonia-oxidising bacteria (AOBs).  Numerous issues had to be overcome during commissioning of the DEMON® reactor, including foaming, maintenance of instrumentation, aeration control, feed flow volume variations as well as intermittent aeration periods causing surge flow through the lamella settler. Significant variations in feed quality and quantity were regular occurrences, but despite this the reactor performed very well.  After start-up, the DEMON® reactor achieved ammonia removal efficiencies above 85% without caustic dosing, and over 95% when additional alkalinity was dosed.

Key words: Basingstoke, De-ammonification, DEMON®, Liquor Treatment, Successful Commissioning.

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