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Soil Remediation

Sea-Chem's unique products help to regenerate brownfield sites by accelerating the natural decomposition of hydrocarbon pollutants - such as oil and gas - within contaminated soils, a process known as bioremediation. Cost-effective and totally sustainable, our soil treatments have quickly become established as leaders within the brownfield industry.


Soil Case Studies

Sea-Chem's bioremediation products have been deployed in a wide variety of settings using an array of treatment programmes. Check back regularly for the latest case studies - or join our mailing list below to get email updates.


From Gasworks to Playing Field

There had formerly been a gasometer on this site, which had contaminated 3000 cubes of soil with an average TPH of 6,500mg/kg and an average PAH of 400mg/kg.

Sanctus, the contractor for the work, were looking for a way of treating the soil on site and avoiding any landfill costs.

We suggested to them that they apply two litres of Sea Power 101, our unique seaweed-based media, with 100g of BioBoost, a dried blend of pseudomonas bacteria, along with 18 litres of water for every cubic metre to be treated.

This solution was then sprayed directly into the soil following screening.

After the treatment was applied, the soil was placed into windrows and left for a period of twelve weeks.

During this time, each windrow was turned twice.

After a period of twelve weeks, the soil had been successfully brought down to safe levels and could be backfilled and compacted.

The site is now ready for use by the adjacent school, Grace Academy.

Award-winning Bioremediation

Tamdown won ‘Best Use of a Single Remediation Technique’ at the 2008 Brownfield Briefing awards for their treatment of this former gasworks in Surrey.

After applying Sea Power 101 during the screening process, Tamdown constructed vented biopiles housed in large poly-tunnels.

Air was continually circulated through the piles using a low vacuum extraction system, preventing the need for mechanical turning.

Prior to the bioremediation, the site’s mean average contamination levels were 2,410mg/kg TPH and 1,100mg/kg PAH.

Following treatment with Sea Power 101 over a period of ten weeks, these levels fell to just 394mg/kg TPH and 218mg/kg PAH respectively, representing a 90% reduction in overall pollution levels.

Brownfield Briefing concluded that this was an achievement unlikely to be possible during the winter months by any other bioremediation method.

Eliminating the need for the transportation and disposal of 200 lorry loads of hazardous waste to landfill and the importation of the necessary backfill, Tamdown’s bioremediation and re-use of 3,250 tonnes of soil resulted in a saving of £195,000, which equates to more than 50% of the total contract sum.

For more information on this case study, please visit the Tamdown and Brownfield Briefing websites.

Outstanding Bioremediation in Winter Months

Sea Power 101 was again able to prove its efficacy when it was utilized on a former industrial site in West Thurrock, Essex, under some extremely challenging conditions.

Formerly a scrapyard, the contaminated site was heavily laden with diesel and other fuels.

Prior to treatment the TPH of the soil ranged between 8,000mg/kg and 10,000mg/kg.

Bioremediation took place between November and December 2010, when the weather in the southeast of England was extremely cold.

Soil from the site was mechanically screened and then sprayed directly with Sea Power 101.

It was then constructed into vented biopiles and left for a period of eight weeks. Soil samples were taken after the treatment period, and showed a new average TPH level of 775mg/kg, which represented a reduction in overall human-health contamination of 91.4%.

The site also passed the stringent leachate targets for the soil of 930μg/l TPH.

From seven leachate samples, the average contamination after eight weeks of treatment was 223μg/l, less than 25% of what was required.

Given the exceptionally low temperatures during this period, our client had concerns about the level of microbial activity that could be expected at the site and about the effect that this might have on the speed and extent of the bioremediation.

However, the results proved that even under these extremely testing conditions, Sea Power 101 dramatically enhanced the natural degradation process at the site.

View full results data for the West Thurrock project.

Other Case Studies

Russian Air Base, Werneuchen, Eastern Germany

Land underneath this site had become contaminated over a long period of time by a mixture of lubricant oils, hydraulic fluids and aviation fuel. Following excavation, the soil applied with Sea Power 101 and formed into biopiles. The vast majority of hydrocarbons were removed in the first 30 days, and the site was fully remediated within four months.

Tar Works, County Durham

Heavy oils and other toxic materials had been contaminated an area of 20,000m2 at this old industrial site. Soil was excavated, treated with Sea Power 101 and placed on windrows to accelerate the bioremediation process. The whole facility was successfully remediated after four months of treatment.

Private Property, Inverness

Following the failure of a domestic heating system, kerosene fuel had contaminated the ground underneath two private houses, producing a noxious atmosphere in one of them. Sea Power 101 was injected into the earth, along with oxygen, in a conventional in-situ process. The site was fully remediated with minimum disturbance to the residents.

Farmland, Avonbridge, Near Bristol

Failure of a valve on a brand new tanker carrying waste oils and diesel led to significant hydrocarbon leakage on this arable land. A very large excavation was carried out, and contaminated soil was placed in windrows and treated with Sea Power 101. Full remediation of the land was possible in six months.

Tar Factory, Rositz, Germany

This site had been producing tar for over 100 hundred years before it was decommissioned in 1992. During the Second World War, the factory was bombed causing extensive soil pollution, which was left untreated until the 1990s. Sea Power 101 was used on the site and showed itself to be highly effective in reducing the overall hydrocarbon content of the soil and in particular the notoriously stubborn PAHs.