Groundwater Nitrate Removal Performance of Selected Pseudomonas Strains Carrying nosZ Gene in Aerobic Granular Sequential Batch Reactors

Four granular sequencing batch reactors (GSBRs) were inoculated with four denitrifying Pseudomonas strains carrying nosZ to study the process of granule formation, operational conditions bioreactors, and carbon concentration needed for nitrate removal. The selected P. stutzeri I1, fluorescens 376, denitrificans Z1, PSC26, previously reported as microorganisms gene. Z1 produced fluffy, low-density granules, a decantation speed below 10 m h?1. However, 376 formed stable mean size from 7 15 mm, related strain concentration. I1 removed efficiently ratio in range 96%, depending on source organic matter. Therefore, findings suggest that inoculation GSBR systems spp. containing gene enables formation efficient removal nitrate, transformation into nitrogen gas, result considerable environmental interest avoid generation nitrous oxide.