report that addition of a metallic cocktail containing (in g/l) MgCl2·6H2O (9.61); MnSO4·H2O (2.52); KCl (6.58); CaCl2·2H2O (8.21); FeCl2·4H2O (8.12); CoCl2·6H2O (1.4); NiCl2·6H2O (0.93);
CuCl2·2H2O (0.05); and ZnCl2 (0.05); with 1 g/l of EDTA, caused the treatment efficiency of a UASB reactor treating ethylene glycol increase substantially.