Controls on biosolids recycling to land are being revised by the European Commission. Proposals for biosolids include immediate limits on implementation with medium-term and long-term limits for further into the future. Implementation of these limits within the UK would seriously threaten the future of biosolids recycling to land. For example, the percentages of biosolids in England and Wales that would fail these limits are 41% immediate limits, 68% medium- term and 92% long-term. In addition, about 40% of land would fail the proposed soil metal limits.
The objective of this project was to capitalise on the research in Phase One of the collaborative project XD237/1 that developed and tested an array of soil microbiological tests at the cutting edge of science in this field. These tests were applied to define safe soil metal limits that protect the biodiversity of soil micro-organisms without being unnecessarily restrictive.
To defend the agricultural outlet for recycling biosolids by providing unequivocal information on the effects of PTE's in sludge-treated soil on soil microbial biodiversity.