Water and Effluent Treatment Magazine
Issue link: https://fhpublishing.uberflip.com/i/516873
JUNE 2015 WET NEWS 11 treatment with the characteristics of the waste stream itself, which changed as the project progressed. A pilot test was carried out a few years ago to prove the process. This showed that fundamentally the process would work at Stoke Bardolph. Paques' process engineer, Simon Kuitert, says: "It's by far the most complex control system we've worked with. We've never automated Phospaq like this before. It's been a learning process." Surplus heat The new plant stacks up some major benefits. In terms of footprint, the highly efficient pre- treatment process brings it in at 25% of the size of a conventional ASP plant. This has removed the necessity for a further ASP plant and associated treatment tanks, achieving major savings on the total expenditure (totex). A saving of 40% capex was achieved based upon the alternative solution to provide additional ASP capacity. Further, the installed system demands only 50% of the air of a standard ASP, so power consumption and energy costs are slashed too. The plant also uses surplus heat from CHP production and the exothermic process within the ANAMMOX to recycle its own internal heat. Some 1,000MWh a year is produced on site. Further operational expenditure (opex) savings are made when the new processes are compared with conventional nitrification and denitrification. Operational costs are reduced by more than 50%, as are CO2 emissions. Each element of the innovative technology is suitable for use either independently or combined, where similar waste streams exist. This is applicable on many of the major treatment plants across the UK particularly in areas with industrial waste streams and those with phosphorus discharge consents. Dylan Thorley, Severn Trent site manager at Stoke Bardolph, says: "It's a win-win for Severn Trent Water. The 7% extra gas production from the UASBplus reactor gives us a better yield on site, which has saved us having to bring in diesel oil. We're getting rid of some ammonias currently going through the head of works by treating them through the ANAMMOX plant, and we're going to remove struvite – and we can actually sell that back to Omex as a fertiliser once commissioning is complete. The partnership with NMCNomenca and Paques has been great. It's always difficult when you've got people on site, but the easier you make it, the better it is for everyone – getting involved, getting them involved is key." n Teresa Jeffcoat is project manager at NMCNomenca Introducing a PHOSPAQ reactor as the first-stage of treatment prevents struvite-related damage to equipment further along the process Simon Kuitert (left), of Paques, and NMCNomenca's John Jenkins check out the installation, which requires only 50% of the air needed for a conventional activated sludge plant Malvern, Worcs WR14 1JJ, UK Tel: +44 (0) 1684 891 371 info@pulsar-pm.com www.pulsar-pm.com Brain Wave New Leve l m ea s ure m e nt that puts you i n contro l l Easy installation l 4-20mA loop powered l Low power for remote applications l 3m, 6m, 10m and 15m options l Superior echo discrimination software (DATEM) allows reliable monitoring of difficult applications l HART communications Pulsar's dBi range of Intelligent Transducers is designed to monitor level or volume up to 15m Also available in Profibus PA version