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Naiad Aquatic and Verder have teamed up to provide a mechanical and electrical solution for Severn Trent Barston Sewage Treatment Works (STW).

The two companies have also provided a detailed understanding of aquatic ecology and the chemicals involved in dosing.

With experience in saturator systems for phosphate removal and an understanding of the processes involved in sewage treatment, a turnkey lime dosing package was designed, manufactured, installed and commissioned to meet the requirements of Severn Trent.

Dr Philip Kerrison of Naiad Aquatic said: ‘The Urban Wastewater Treatment Directive imposes a legal obligation on the sewage treatment authorities to remove phosphate from sewage.

‘The phosphate removal is needed to prevent the fertilisation of receiving watercourses and the subsequent enhanced risks of eutrophication.

‘The process of removing phosphate involves dosing ferric sulphate, an acidic.

‘Lime is then added after the biological treatment phase [phosphate removal] to ensure that the sewage is subsequently able to nitrify successfully before being discharged from the works.

‘The micro-organisms that carry out the nitrification process require pH to be between seven and eight and are inhibited by more acid conditions.

‘Lime is dosed to balance the PH of the sewage,’ he added.

Mike Heap, sales and marketing director of Verder, said: ‘Barston STW was previously fitted with a dosing system comprising metering pumps and an upstream PH sampling point to allow the system to run automatically.

‘However, site operators were unable to use the system automatically because the pH sampling was not quick or accurate enough, resulting in the over- and under-dosing of lime.

‘Since its installation, the system has only been used in manual mode.

‘As well as having to adjust the system, daily operators had no end of problems, such as blocked and failing metering pumps and a heavy build-up of lime.

‘Working with Naiad, Verder engineers installed a completely new system carrying out all the mechanical and electrical works involved.

‘The Verder/Naiad Dose system allowed for fully automatic control with the installation of a new control system and pH monitoring, with special pH probes allowing for a quicker response and very minimal maintenance periods.

‘The new installation allows better lime handling and mixing while ensuring the lime is dosed correctly and the set pH level is always maintained automatically without the need for any manual adjustment,’ he added.

A pump solution for every application

Verderflex
Peristaltic hose pumps are very versatile however generally they are for heavy-duty applications such as abrasive slurry, high solid content or high suction lift requirements found in industrial, sewage and mining applications. Our VF range features the world’s largest ID hose pump for the most demanding applications.

Advantages of Verderflex Peristaltic pumps:
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With the absence of mechanical seals, the Verdermag® range eliminates the danger of abrasive wear from the drive shaft and seal faces and instead uses an o-ring sealing system. As the pump has no vulnerability to containing the media, it can provide reliable handling of hazardous fluids such as volatile, corrosive and toxic chemicals with no risk to employees, the environment or surrounding equipment. The range encompasses compact low flow/head pumps commonly used in OEM systems through to high flow, heavy duty pumps rated up to 200 bar. For compatibility with all types of chemicals the range is available with both metallic and non-metallic materials such as ETFE and a range of alloys. Custom pump specifications are available.

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Verderhus screw centrifugal pumps combine the best features of centrifugal and positive displacement pumps to define a new standard for low head, high flow pumping. Verderhus® pumps transfer your product gently and efficiently. The open impeller allows large solids to be easily pumped that reduces the risk of cavitation, which can cause serious damage to a pump and to the production process. A Verderhus pump will lower both energy use and ownership costs.

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