Anaerobic degradation of dimethyl phthalate in wastewater in a UASB reactor

Over 99% of dimethyl phthalate (DMP) and 93% of chemical oxygen demand (COD) were effectively removed in a continuous upflow anaerobic sludge blanket (UASB) reactor from a wastewater containing 600mg/L DMP at 8h of hydraulic retention time (HRT), corresponding to a loading rate of 3g-COD/(Ld). Each gram of sludge, expressed as volatile suspended solids (VSS), had a maximum specific methanogenic activity (SMA) of 24mg-CH4/(g-VSSd) using DMP as the sole carbon source. The sludge yield was estimated as 0.08g-VSS/g-COD. During anaerobic degradation, DMP was de-esterified, first to mono-methyl phthalate (MMP) and then to phthalate, before being de-aromatized and subsequently converted to CH4 and CO2. The maximum specific degradation rates of DMP, MMP and phthalate were 415, 88 and 36mg/(g-VSSd), respectively. Analysis based on polymerase chain reaction (PCR) and denaturing gradient gel electrophoresis (DGGE) showed a gradual shift of microbial population with the increase of DMP loading. [Copyright &y& Elsevier]