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
Gas analyzers help get approval for Nord Stream gas pipeline
Systems integrator Hint and Nord Stream built gas analyzers that can determine, on the basis of the samples, the blend’s composition. This helped...
Process Control for Energy Production Enters Deeper Waters
OLDI Special Applications Module extends reach of Allen-Bradley ControlLogix controllers in subsea oil drilling by providing higher data volumes...
Innominate secures remote maintenance for FRIMO
FRIMO has integrated 80 remote service connectivity solutions. Using VNC (virtual network computing) software, the entire screen content of the...
PLC version control software cuts machine downtime at SWEP
By introducing change management and version control software from for all its PLCs in five production plants, heat exchanger manufacturer SWEP has...
Emerson cuts greenhouse gases for Qatargas
Emerson provided automation and engineering services for a Qatargas project that will reduce greenhouse gas emissions by 1.6 million tonnes...
ISA International Instrumentation Symposium issues Call for Papers
The deadline for abstract submission is 15 January 2016.
Endress+Hauser opens new office in Spain
The office is in Sant Cugat in the west of the Barcelona metropolitan region.
Endress+Hauser Announces Fall and Winter 2015 Training Courses
Classes typically are a combination of classroom and hands-on training on either the Endress+Hauser PTU (Process Training Unit), a full-scale,...
System integration and functional safety: key issues impacting the actuation industry
By Heike Schmeding, AUMA
This article provides an update on two key issues currently impacting the actuation industry: host system integration and...
Fluke announces Fluke Connect Student Contest
The team showing the most innovation wins a trip to Seattle and $3,500 worth of Fluke tools.