Articles & Case Studies

A Clean Sweep at Chelsea Barracks

Posted: Wednesday 21st March 2018

Siltbuster's sweeper waste dewatering system has enabled Alandale Logistics to halve the number of sweeper vehicles it is using on the £3bn Chelsea Barracks redevelopment, reduce the amount waste to be disposed of by more than 50%, and at the same time improve its clean-up of the 12.8-acre site.

Chelsea Barracks is in one of London's most expensive residential areas. In the heart of Belgravia and Chelsea, once redeveloped the new residential neighbourhood will feature houses, apartments local shops, restaurants, a community centre, a public sports and fitness facility and a medical centre. The redevelopment is in six phases and is taking 4-5 years with a completion date of 2020-2021.

For Alandale Logistics, tasked with managing the site day-to-day during the first three phases, the location presents a number of challenges: the development involves very deep excavations in London clay; groundwater continually requires pumping to keep work area dry and this groundwater is highly alkaline and contains suspended solids; the work involves large concrete pours on the site; it's also a very busy site with multiple wagon movements.

Roland Alla, Site Manager at Alandale Logistics elaborates: "This huge level of activity is happening in a very sensitive location, with some of London's most expensive properties overlooking the site. The last thing people in the area want is lots of mud on their roads and dust on their windows or large amounts of traffic needlessly coming to and from the site."

Alandale Logistics was employing two sweeper vehicles to keep the site and public roads clean however despite these efforts, residents' complaints about the dirt on their roads, together with regulator enforcements, were a continual challenge for both Alandale Logistics, and the construction company it was working for, Mace.

Due to London traffic, each sweeper was spending up to 3 hours, sometimes twice per day, driving waste to an offsite disposal or recycling facility and returning to the site. With a London sweeper costing circa £50 per hr, this was an expensive amount of unproductive time. Furthermore, the site's waste disposal charges were excessive, particularly during wet weather when the sweeper vehicle was filled with dirty rainwater which could not simply be released to the sewer.

Alandale Logistics is successfully using a Siltbuster hook-lift sweeper waste dewatering system at the Kings Cross redevelopment and suggested the same equipment would work well at Chelsea Barracks. Mace visited the Kings Cross site and agreed.

The results have been almost immediate as Roland explains:

"With each sweeper off-loading wet waste on site into the Siltbuster system, the drivers can concentrate on sweeping the site rather than spend time stuck on London's roads."

The whole system is so much more efficient that within days of hiring the Siltbuster sweeper waste system Alandale was able to reduce the number of full time sweeper vehicles from two to one.

The Siltbuster system handles the wet waste, dewatering it. The separated out water is cleaned and has its pH adjusted using a Siltbuster pHD unit. It is then safely discharged to foul sewer under consent from Thames Water. With the water removed, the dewatered solid waste only needs to be sent to Westminster Waste for recycling once every two weeks, reducing the disposal costs by more than 50%.

Roland concludes: "We've cleaner roads on and off the site and reduced traffic to and from Chelsea Barracks. Added to this we've reduced both the monthly waste disposal costs and the cost of our sweeper operations by more than half - by every measure the Siltbuster solution has delivered."

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August 2021

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