Water and Effluent Treatment Magazine
Issue link: https://read.utilityweek.co.uk/i/411335
SAPPEL is becoming Diehl Metering Sappel - Diehl Metering offers systems with high-quality metering, low starting flows and a large dynamic range. Metering and data collection systems can be used in all field configurations. With fixed, mobile and M-Bus networks, our radio reading systems are efficient, scalable and switching from mobile reading to fixed network is seamless. www.diehl.com/metering ALTAIR and HYDRUS Smart solutions for water metering Visit us at Pollutec | Lyon 2 - 5 December 2014 | Hall 6 - stand G240 Contact: sales.uk@sappel.fr Diehl Metering Ltd., 22C Salmon Fields Business Village, Royton Oldham OL2 6HT | Tel. +44 (0) 161 6209593 Sappel - Diehl Metering offers systems with high-quality metering, low starting flows and a large dynamic HILTON BIRMINGHAM METROPOLE 2 1 ST A P R I L 20 15 T HE G RE ATEST AW A R D S O N E A RT H enter now R O L L UP R O L L UP A R E COM I NG T O T OWN W W W.W W T O N L I N E . C O . U K /A W A R D S CLOSING DATE: 12 TH DECEMBER Organised by Sponsored by longevity, given the coastal environment of the site, the beams were designed in rein- forced concrete and included overhangs at each end for a sim- ple hooked connection," he says. Banagher Precast Concrete in Ireland made the specialist items: 64 beams each 16m long weighing 8tonnes. Construction Two existing primary settlement tanks and an activated sludge plant structure had to be demol- ished to generate sufficient space for the new Bardenpho activated sludge plant. But the site had to maintain consent compliance throughout construction. A phased approach to con- struction of the new tank was adopted: first clearing the greenfield area and treating the ground, then constructing two of the four new ASP lanes and two, 33m diameter conical final settlement tanks. This was followed by instal- lation of all associated process pipework, mechanical and elec- trical plant to enable commis- sioning for carbonaceous treat- ment of a proportion of flow. This additional process capacity allowed the redundant assets to be decommissioned and demol- ished. The remaining two ASP lanes were constructed in the newly available space and the full structure commissioned for full biological nutrient removal enabling decommissioning of the other ASP. "By phasing the construction in this way, the existing site was given a significant boost in terms of available treatment capacity during construction," Tresidder says. During construction more than 10,000m3 of concrete and 1,500 tonnes of reinforcement was placed. More than 1.5km of new pipelines up to 1.2m in diameter were laid together with 3km-plus of cable ducts. In addition, more than 100 tonnes of new above-ground steelwork was installed. "All of this work has been undertaken in a working site with limited space and overhead high-voltage cables," Tresidder says. Crawler cranes were used to aid construction of the major structures, with further mobile cranes of various sizes in sup- port. "Installation of the propped cantilever tie beams for the new ASP structure was par- ticularly challenging due to the site logistics and involved the use of a 350-tonne mobile crane to li' the 8-tonne beams into position." Revisions The upgrade of Millbrook WwTW is one of the largest capi- tal non-infrastructure schemes delivered on behalf of Southern Water for its AMP5 investment programme. The principal contractor, 4Delivery, brought knowledge and expertise from its joint ven- ture partners Veolia Water, Cos- tain and MWH. Delivery of the scheme was a challenge given the scale of the new infrastructure required and the myriad of physical constraints. Innovation in the design was required to overcome these, helped by a collaborative approach with early input from the construction team. This avoided the need for revisions on the ground. The delivery team meticu- lously planned the two-staged schedule to ensure construction could proceed with the utmost heed to health and safety, exist- ing plant operation and the environment. The plant became fully oper- ational in September when effluent discharge had signifi- cantly reduced nutrient input into the Solent. This forms part of a regional environmental pro- gramme that safeguards the quality of local waters for the benefit and enjoyment of local communities. "From an engineering point of view, this has been an excit- ing scheme to work on. It will have huge environmental bene- fits – the end result will be a much greener treatment waste- water to even higher standards before releasing it into the Solent," Garrett says. n By including external constraints such as the overhead HV cables, the model was also used to help plan safe methods of working