Water & Wastewater Treatment

Project focus: Pump controls at Llwyn Onn Fixing your pump doesn't have to be a puzzle. With Tsurumi everything slots into place. An easy fix Tsurumi EuropE | T: +49 211 417 9373 | F: +49 211 479 1429 | E: sAles@Tsurumi.eu | W: WWW.Tsurumi.eu ply chain for this project was souurced from the north Wales area, including the system integrator, Tycon Automa- tion, which has extensive knowledge and experience of the Mitsubishi product range. The QnPRH is Mitsubishi's most sophisticated control solution and represents the top end of the Q Series Automation Platform. It offers a high level of system redundancy which ensures complete immunity to process interruptions caused by power or system failures. This is achieved by using a fully redundant architecture that duplicates processors and network links. Hot-swap capability provides an operational level of redundancy. The solution was developed specifically for use in applications where downtime cannot be tolerated. The dual redun- dant CPUs (control and standby) mean that any failure of the control CPU causes immediate transfer of control to the back-up, preventing system failure or interruption. Synchronization of up to 100,000 words of process data is possible between CPUs per scan. Switchover time is typically around 20- 40ms, ensuring a "bumpless" transfer. Because the CPUs reside on physically • Innovations ● A crucial aspect to the control system was the use of a full dual redundant PLC system. Complete with its own CPU, the sec- ondary system is fully wired-in and tested, increasing the system reliability by mirror- ing the primary CPU so that in the unlikely event of a failure of the main CPU, power supply or base unit, the secondary system can take over within 21 milliseconds from the same control point ● The flexibility of the programming environ- ment meant that the system architecture could be broken down into function blocks representing all parts of the plant. Function blocks previously developed for water treatment applications by Tycon Automation, could be used, which made the job simpler to realise. ● A remote access VPN link into the site means we can access the SCADA layer and therefore the PLC in real time and can easily interrogate the system to see what the raw code is doing and carry out any fault finding activities. It is important with such a large program to have a logical structure which makes it easy to interrogate. separate racks, the control CPU can be replaced while back-up maintains system operation. Most parts are interchangeable with standard Q Series systems which controls both purchase cost and total cost of ownership. The water treatment process consists of dissolved air flotation (DAF) clarifica- tion, granular activated carbon (GAC) filtration followed by rapid gravity filtration (RGF) and a chlorine contact tank before being pumped to a storage tank – from where it is fed into the distribution network. Although this is not the conventional process order, it is an arrangement that has been designed to work in this area, which has the addi- tional issue of manganese to deal with. Search 'Dee Valley' at WWTonline.co.uk for full details of the Llwyn Onn project. 30 | june 2014 | WWT | www.wwtonline.co.uk AxFlow Ltd., Tel: 0208 579 2111, Fax: 0208 5797326, e-mail: info@axflow.co.uk ® fluidity.nonstop is a registered trademark of the AxFlow Group Primary sedimentation Biological treatment Clarifier Tertiary treatment Digesters Sludge holding tank Conditioning agents Dewatering Incineration Sludge thickening Boiler Power generation Trickling filters Primary sedimentation Biological treatment Clarifier Tertiary treatment Digesters Sludge holding tank Conditioning agents Dewatering Incineration Sludge thickening Boiler Power generation Trickling filters + What does it cost if your process stops? in waste water treatment Safeguarding your process from the unthinkable is just one part of what we do. Selecting the right pump for the job with world class equipment and applications understanding, we add a whole new level of operational security to your process. These are our top selling pumps for waste water applications Wemco WSP self priming heavy duty pump. Suitable for clean water as well as liquids containing large solids. Realax hose pumps are excellent for pumping sludge. Minimum floor space required and minimum maintenance with only one spare part – the hose. OBL diaphragm pumps for chemical dosing. Modular design, flow adjustability, fast delivery. Scan to see all our fluid handling solutions. Wemco_advertising_full_page.indd 2 2013-03-27 15:55:40

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