WET News

Diehl Metering offers systems with high-quality metering, low starting flows and a large dynamic range. With ALTAIR V4 or HYDRUS, the technology IZAR R4 offers efficient and scalable radio reading systems (fixed, mobile and M-Bus networks) and switching from mobile reading to fixed network is seamless... www.diehl.com/metering Diehl Metering Ltd | 2D131 Dean Clough, Halifax HX3 5AX | Tel. +44(0) 1422 255 998 Email: sales.uk@diehl.com ALTAIR, HYDRUS and IZAR Smart solutions for water metering Meet us at Interclima | Paris - FRANCE From 2 to 6 November 2015 | Hall 1 - Path B - Stand 143 © SakhanPhotography - Fotolia.com SEPTEMBER 2015 WET NEWS 13 control and deliver sludge to provide 20% of the plant's energy needs. The largest sludge treatment project is at Beckton STW where a total of 24 existing sedimentation tanks have been retrofitted with Zickert sludge scrapers, adding to eight existing primary tanks already converted to the Zickert system. At Mogden, eight primary settlement tanks had previously been retrofitted with the Zickert technology and a further eight existing primary settlement tanks and five new tanks built were also retrofitted in a second phase which is part of Thames Water's £140M upgrade to increase sewage treatment capacity at the site by 50%. Objective "Considerable energy savings accrue with the implementation of close fitted tank covers," points out Strange. "An important further objective is to increase our use of sludge for digestion and gas production. For example we have made significant investment in new high yield thermal hydrolysis plants, especially at the bigger sites, and have a couple more sites to expand to. "To improve gas volumes, we have been looking at the performance of our Primary Settlement Tanks to remove sludge before thick blankets form. The use of Zickert technology can help achieve this as the technology means that the sludge has to come out fresher so we should be getting a better gas yield than with travelling bridges. We will be able to make comparisons over 2014/2015, particularly between Beckton and Long Reach, where travelling bridges have been retained, as the plant is not being encroached to the same degree." Maintenance and tank cleaning is another long term operating cost issue that will be assessed and compared. "My operations colleagues will be looking at this, as well," states Strange, "as it is part of the lifetime cost equation. At the moment, it seems that is easier to maintain the tanks fitted with Zickert, as most wear parts are outside the tank whereas the travelling bridge has to be completely shut down during maintenance." Zickert offers significant advantages over conventional sludge and scum scraping technology with lower operating and infrastructure costs. The gentle action of the Zickert equipment produces a higher yield of sludge than conventional scrapers. Its higher throughput reduces the amount of secondary treatment required and produces more primary sludge with a higher calorific value. 2-STAGE SCT HAS ARRIVED 2-stage SCT is for applications up to 8 bar but with all the same benefits as 1-stage SCT. Smart Conveying Technology offers: y Reduced downtime, extended stator life and fewer maintenance needs y Reduced energy use compared to conventional progressive cavity pumps y Planned predictive maintenance without unplanned downtime y Maintenance time reduced by up to 85% y Health and safety requirements reduced by lighter components The end result; productivity is improved by reduced downtime and faster maintenance. SEEPEX UK Ltd. sales.uk@seepex.com www.seepex.com THE BIG BROTHER TO 1-STAGE SCT BUT WITH MORE 'OOMPH'! Installing the Zickert at the Mogden STW The Zickert bottom scraper is a framework of plough-shaped, profiled blades that move the sludge in a reciprocating action As development has encroached on its sites, Thames has been driven to cover more primary settlement tanks

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