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Agrivert Limited

About

Design, build and operate In- Vessel and Green Waste Composting facilities, including the marketing and Recycling of the finished product. We also lay a impermeable sealed suface. Mobile Dewatering, Lime Treatment, Marketing and Recycling of Industrial and Sewage Sludges.

Contact

Mr Harry Waters
The Stables, Radford

Chipping Norton
Oxfordshire
OX7 4EB
www.agrivert.co.uk

Agrivert upgrades waste treatment in Outer Hebrides

The Isle of Lewis is home to a sewage treatment centre that treats not only the sewage for the 23,000 residents but also the surrounding islands. Holm Point Sewage Treatment Centre in Stornoway now produces 6,000 tonnes of sludge cake per year, with the recent increase attributed to secondary treatment and extra imports.

In order to deal with this increase, as part of a wide ranging plant upgrade, Agrivert were commissioned by Scottish Water and Galliford Morgan Joint Ventures (GMJV) to upgrade the lime treatment plant for treating the dewatered cake. Agrivert are specialists in designing and building dewatering and lime treatment plants for the water industry and have bought their expertise to this project.

Alexander Maddan, managing director of Agrivert, says: "Stornoway was quite a challenging project to work on. Not only is the Isle of Lewis an environmentally sensitive location but it is also very remote, and primarily accessible by boat. We met unforeseen challenges such as shipping delays caused by gales which made things less predictable!"

The main reason that Agrivert was called in was to upgrade the old plant in order to comply with the Urban Wastewater Treatment Directive calling for the secondary treatment of sewage sludge. This increase in mandatory treatment means that much larger quantities of sewage sludge are produced so Stornoway had to be upgraded to cope with these increased volumes.

The key requirements were to re-appraise the addition of quicklime and to re-balance the whole plant in order to accommodate the greater volumes to be treated. Additionally, some health and safety issues needed re-considering, such as access, barriers, sealing of equipment and creating safe access to the process.

The refurbishments at Stornoway were planned and executed in two phases, each lasting roughly seven days, in order to minimize disruption to the plant. The first phase began on 9th January and the whole project was completed by the end of the month.

John Williams at GMJV, says: "Agrivert lived up to their good reputation. Their work was competitively priced, very high quality, and carried out within a tight time frame. Also, the fact that they used local labour and materials has made them popular on the island".

For further information please email Agrivert Limited

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