Approximately 12,000 tonnes of Biofert are produced annually at Dublin Corporation's sewage treatment plant at Ringsend. This is spread on approximately 50 farms in the Leinster region and a nutrient management plan is prepared for each farm involved.
For Biofert to be suitable for land application it must comply with the requirements of the Waste Management (Use of Sewage Sludge in Agriculture) Regulations, 1998 and the Code of Good Practice for the Use of Biosolids in Agriculture (Department of the Environment and Local Government, 1999).
The process of producing Biofert involves thermal treatment of sewage sludge. The standard used to assess the level of pathogens in Biofert is that set by the USA's Environmental Protection Agency for class A sludge. The pathogen level in Biofert (which is treated at 450-500 degrees centigrade) is only 1% of the maximum level set by the US Environmental Protection Agency.