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
Weiss rotary indexing table cuts test time for parts
Geissler wanted to accelerate cycle times for a test bench that performed the final inspection of precision turned parts. They replaced a... MORE
Stereo 3D machine vision cameras help robot bin picker
BsAutomatisierung in Rosenfeld,Germany, uses Ensenso 3D vision cameras in its robotic bin-picking cells to pick individual, randomly aligned parts... MORE
UNIGEN starts up Werum's PAS-X MES in only four months
PAS-X was delivered with the entire user interface in Japanese. Werum carried out this project in cooperation with their Japanese integration... MORE
Better Data Analysis Increases Efficiency at Coffee Plant
An HMI from InduSoft improves productivity through automated monitoring and tracking of operations at Mother Parkers Tea & Coffee in Fort Worth,... MORE
Automation Lessons Learned at Iron Bridge Water Plant
By Bill Lydon, Editor
The Iron Bridge plant was originally built in the 1980s to treat about 5 million gallons of wastewater per day. After... MORE
Reducing Liability through Proper Safety Label Design
By Todd Fries, HellermannTyton
Companies are becoming increasingly aware that inadequate or non-existent warnings are a major cause of... MORE
Fundamentals of real-time processing in automation and...
By Mario Torre
The most important constraint in a real-time system is that the time it takes to process an input and produce... MORE