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Safety was critical in this dynamic situation and tracking progress from a safe distance was challenging. There was, however, one small area with the minimum space we needed to get the drone in and provide the first eyes on what was happening under there, with no risk to anyone involved.
This week we re-cycle, re-use and re-emphasise the emission saving benefits of rejuvenating a Rapid Gravity Filter, in situ, without replacing the media.
Calculations on work completed at one particular Scottish Water Treatment Plant highlighted that we saved around 1.5 tonnes of carbon emissions on each filter bed as we improved the filter bed performance without replacing the media.
This Service Reservoir is one of two cells side by side with a shared wall between them. The confined space drone was inspecting the empty cell while the other cell, through the wall, was full and in service.
When we put the thermal imagery overlay on two different ingress points, we found that the water coming in presented as different temperatures. This suggests the source of each is different.
The problem was a treated water Service Reservoir (SR) that was losing 1 million litres a day and our clients knew it was in the SR somewhere.
Unable to inspect it off-line, they called us in to have a look round with one of our ROVs. They expected an obvious hole or crack - but nothing was found. Our operator suggested a quick look up into the inlet pipe before ending the job and, hey-presto, problem identified - enabling the repair planning to start.
Our in situ filter cleaning process saves time and significant cost by leaving the media in place while reaching the places a media removal refurbishment struggles to do.
This filter bed at a strategic Water Treatment Works went back into operational service - 4 weeks and 1 day after we started rehabilitation work on it.
This process has already saved Scottish Water hundreds of thousands of pounds with more being lined up.
This disused brick Victorian water tank, built between 1860 and 1880, was a structural concern for our client, with no view of the inside having taken place in living memory and almost no records available.
We entered super safely with our confined space drone. Delighted and amazed to discover how good the condition still is. They built them strong in those days.
Also quite an interesting discovery took place while we were doing it
Yasmin is now nearly two years into this four year PhD project, focusing on developing an acid-based chemical cleaning reagent, based on the Panton McLeod proprietary reagents, to clean NF membranes used specifically in the water treatment industry.
It's a long term project for us but the early results are very promising and we look forward to sharing more on this as Yasmin's work continues.
With seventeen years of Underwater ROV and two years of Confined Space Drone experience - we now add outdoor drone capabilities
Note the high quality thermal imagery we can now shoot and how the flood testing process on this Service Reservoir is stunningly obvious in this clear footage.
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