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Hydro Cleansing – Treating Your Drilling Slurry Right!

Slurry is a general word for a variety of waste types. Sludge, manure, drilling waste, bentonite waste can all fall under this term. Hydro Cleansing can collect and dispose of all of it, taking it to our wet waste treatment centre in Croydon.
Drilling waste removal

How much is slurry worth? Farm slurry is worth more than milk these days. Sustainable energy is becoming more and more profitable and farmers are making the most of it. Drilling slurry can’t yet contribute to the energy cycle but it can be compressed to recycle the water used in creating it.

Drilling slurry is created from water used during the drilling process mixing with the waste from the material being drilled through. Drilling slurry varies in density. It can be anything from a dense sludge to a thin cream. That depends on the kind of surface they are drilling through. For instance, a lot of the super sewer’s slurry came out like cream due to the amount of fluid necessary to keep the boring machine working and the chalk rock that they were boring thorough.

Super sewer slurry

It is vital to remove drilling slurry as quickly as possible as it can set solid whilst still appearing movable on the surface. The sediment in the drilling slurry can separate and cause the sediment at the bottom to solidify. The water rises to the top, giving the impression that the slurry is still liquid. Act now! Get your drilling waste treated!

Removal and disposal of drilling slurry

Slurry can include chemicals and require testing before disposal. Hydro Cleansing offer this service as part of our full drilling waste disposal and treatment service.

Our tankers visit a construction site, empty the IBCs and tanks using vacuum suction. The tanks are jetted and vacuumed clean and the drilling slurry is removed for disposal and treatment.

The drilling waste is treated at our Croydon depot. The water is removed and the sediment compressed into a pulp or ‘cake.’

Not for eating, this cake is then sent to landfill and the recycled water is reused to keep our beautiful trucks clean!

Megatron tanker

Hydro Cleansing go diving for drainage!

Hydro cleansing divingA lesser known speciality of ours is commercial diving. As part of waste work occasionally diving into flooded chambers can be required in order to repair drainage infrastructure.

We’ve cleaned out the queen’s palaces, responded to some of the worst floods in the UK, created floating cctv cameras, done hydro demolition for the millennium dome etc.  Hydro Cleansing loves a challenge!

hydro cleansing diving 2

A balancing lake off the M26 was on the verge of flooding as the chamber that let the lake flow into the drainage infrastructure was blocked. The flap valve between the chamber and the sewer was trapped shut by the water pressure and the strap which had allowed it to be opened had eroded. This was replaced with a metal chain.

Hydro cleansing diving 3

Our diving engineer had to access the chamber and pull open the valve and attach the access chain. This valve is in place to adjust the flow from the lake into the culvert that flows underneath the motorway. This lake and complex drainage system is in place to handle flash flooding and storm water from the motorway and prevent the roundabout from flooding.

The job was attended by our confined space engineers and the diver was attached to the safety tripod with a rescue harness and was winched into the 4m chamber. The pressure on the valve was intense but our engineer freed it allowing the water to run into the drain.

Hydro Cleansing diving 4

This job displays the fathomless depths of Hydro Cleansing’s services!

Flood annihilated by Megatron and Hydro Cleansing!

Flood annihilated by Megatron and Hydro Cleansing!


A life threatening flash flood was vacuumed up in 3 hours by Megatron, Europe’s largest vacuum tanker and the Hydro Cleansing fleet. They delivered an emergency solution to the flash flood in the underpass beside Wallington Station, where 3 cars were swamped by 2m of water on the 7th of June 2016.


1 month’s rainfall fell in 1 hour in a horrendous storm, the lightening from which started several fires across the South of London.  3 cars were trapped. One stalled, the next became trapped as the waters knocked out the engines. The third inexplicably drove into the flood water on purpose. One man was trapped in his car and had to be rescued by a passer-by breaking his car window with a brick, allowing him to get out and wade clear of the water bound car.7V7A0797

Immediately a bulk tanker was dispatched from Hydro Cleansing’s depot in Beddington Lane, Croydon with a police escort and arrived at the scene within an hour of the storm beginning. The three cars were submerged. The 13,000 litre bulk tanker began pumping out the water. 2 combination vacuum tankers followed to the site to remove more of the oil contaminated water. As those tankers left to tip the waste, Megatron, the largest vacuum tanker in Europe emblazoned with transformers graffiti fan art, arrived to clear the rest of the oily waste and empty the 60m soakaway. The bulk tanker returned to relieve Megatron of the waste. The engineers pushed the ruined cars off the road and finally one of Hydro Cleansing’s road sweepers cleared the oily silt from the road The road could then reopen 3 hours after the incident. The fleet of giant orange tankers fulfilled Megatron’s heroic reputation and also provided a neat and tidy end to this environmental thriller.

Megatron flood



This kind of flooding is becoming increasingly prevalent. It would be easy to dismiss this as a one off act of God but Paris remains submerged and the forecasts indicate that storms will continue to become more intense as global temperatures rise. “Warming temperatures can make the air hold more water – and that in turn could mean a greater chance for floods”, says Nigel Arnell at the University of Reading, UK. Russell Grattan, Commercial Director at Hydro Cleansing identified that the soakaway under the underpass did have some foliage blocking the flow of the drainage. This flash flood exposed infrastructure weak spots and highlights the need for thorough flood planning to be in place.