Rotork valves help keep sewage off beaches
July 25, 2013 - Rotork flow control equipment has been installed at a sewage treatment works serving Somerset’s largest tourist resort on the south west coast of England.
Wessex Water has invested £26 million at the site to achieve improved bathing water quality for the resort of Weston-super-Mare. The improvements will ensure that the site can cope with increased population and continues to comply with standards set by the Environment Agency. The work has been completed ahead of the revised Bathing Water Directive, which comes into force in 2015 and introduces more stringent water quality standards.
New process plant and equipment has been constructed to improve secondary treatment by the replacement of submerged biological contactors with an efficient and reliable four-channel activated sludge plant (ASP), combined with increased final settlement capacity. This enables newly installed Ultra-Violet disinfection plant to achieve better microbial reduction and meet strict consent levels in the final effluent. The upgraded site is designed to deliver a flow to full treatment (FFT) rate of 1050 litres/second.
Additional work on the site has involved the introduction of storm settlement tanks with a capacity of 21,000 m3 (tonnes) to assist the reduction of over-spills in combination with a separate programme to remove surface water flows into the area’s foul sewer network.
Rotork’s scope of supply for flow control in the project encompasses IQ multi-turn and IQT quarter-turn intelligent electric actuators and IB manual gearboxes for motorised and hand operated valves and penstocks throughout the new works. All electric actuators are Profibus-DP V1 network enabled and centrally controlled by a bespoke SCADA system designed by the Wessex Water Automation Team. The use of Profibus technology, a standard feature of Wessex Water’s automation programmes, delivers significant savings in cabling, terminations, PLC hardware and labour.
The SCADA system runs the automated processes and collects control, status and diagnostic data from each actuator. This information is available on the site and at Wessex Water’s regional operation centre at Bath, where remote diagnostics has proved to be a cost effective method of maintenance and service by identifying the right operational staff to be sent to site if required.
The upgrade project at Weston-super-Mare STW has been performed by a partnership made up of the Halcrow Group, Dean & Dyball Civil Engineering, Nomenca and Wessex Engineering & Construction Services. The Rotork equipment was supplied in accordance with the Framework Agreement which the company holds with Wessex Water.
MORE CASE STUDIES
CAS data acquisition system cleans up detergent tests
German detergent manufacturer Henkel replaced its old data recorders with 10 Delphin measurement data acquisition systems.
Procentec solves Profibus problems at Dutch water treatment plant
Using ProfiTrace 2 diagnostics found a corroded cable at the Rijnland waste water purification plant.
FuelCell Energy uses VFDs and PACs to improve grid connection
Rockwell Automation PowerFlex 700L drives and CompactLogix PACS convert DC power to AC power within the fuel cell and connect it to the grid.
Jonah Energy Implements FLOWCLOUD Hosting Solution
Jonah Energy, a startup exploration and production company, is using Flow-Cal’s FLOWCLOUD hosting solution to obtain data in a cloud environment....
LB Foster builds Assembly line for Jaguar XF Sportbrake
The tabbing and framing cell takes the Sportbrake body floor out of the assembly line to have the side body panels, roof and other components put...
CERN and NI Collaborate on Linux
Their objective is to push the standardization of all CERN control systems to Linux 64-bit operating systems.
FCI flow switch receives FM Div 1/Zone 1 Approval
FCI has received FM Div 1/Zone 1 Approval on all remote probe configurations for the FS10A Analyzer Flow Switch/Monitor.
Skkynet Expands Registration for Secure Cloud Service
Immediate access to secure, end-to-end networking service now widely available.
Clippard Publishes Pneumatic Products & Solutions Catalog
Catalog covers miniature pneumatic products including specifications, technical drawings, and application highlights.
ISA publishes Measurement and Control Basics book
Fifth edition has been extensively updated to reflect the latest advances in automation technologies and incorporate valuable new self-study...