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18/01/2025
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According to a recent article from the Guardian, sewage sludge spread on farmland is contaminating soils, water and potentially the food chain with “forever chemicals”. While whistleblowers from the Environment Agency say the systems in place to prevent such pollution are “not fit for purpose”.
Huge volumes of sewage sludge, also known as biosolids - essentially human excrement and industrial waste - are spread on UK fields every year. It is regulated by the Environment Agency and treated by water companies before being sold to farmers, but many substances are not removed by the processes.
The Environment Agency is supposed to police the sludge, but whistleblowers from the agency told Watershed and the Guardian that in reality, this isn't happening. Industrial waste enters sewage treatment works every day, as well as human waste, either via the sewerage system or by tanker. Much of the waste tankered in contains leachate – dirty liquid created by landfills – which contains a cocktail of chemicals from a range of industries.
In March 2020 the EA published a strategy for safe and sustainable sludge use, but its implementation date kept slipping and according to the Guardian, an environment Agency insider says little has been done in practice.
While in theory, human based wastes do have great potential to replenish soil, the current processes are not fit for purpose.
What about organic farming? Organic land is subject to tight controls and the The Soil Association bans human based waste, including sewage sludge, due to the risk of contamination.
Instead, organic farmers, including Riverford, use a combination of animal manures, compost and grass and clovers in their fields to add different nutrients back into the soil, which builds up fertility slowly and naturally. So-called green manures are crops like clover, rye or vetch grown specifically for their ability to store (or release) nitrogen, which they release when ploughed back into the soil.
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