A successful full scale plant trial has been completed by Biochemica UK Ltd at a tannery in East Anglia. Following a site survey, test work and consultation with plant engineers a full scale trial was implemented using a different treatment chemistry. In addition some process changes were also put in place with a view to further enhancing performance. During the trial a consistent improvement in DAF COD and TSS reductions were recorded. The chemical requirements for the process were also less than before thereby reducing plant running costs. These changes have now been implemented on a permanent basis.