DOMESTIC WASTEWATER TREATMENT BY USING POST ANOXIC HYBRID BIOREACTOR.

The study was conducted on Post Anoxic Hybrid Bioreactor (PAHB) for domestic wastewater treatment to provide optimized media filling ratio for carbonaceous and nitrogenous organic matter removal at varying Hydraulic Retention Time (HRT) and Surface Area Loading Rate (SALR). This study focused on the use of a hybrid reactor system in which MBBR carrier media was used but instead of keeping it in suspension; its mobility was restricted and carrier media wasn’t allowed to move or settle at the bottom by providing the threads. The maximum organic load applied to the reactor during the study was 23.23 g BOD3/m2/d and 26.11 g COD/m2/d on average. SALR was kept in the range of 5.8 to 23.3 g BOD3/m2/d and 7.5 to 35.6 g COD/m2/d. The media filling ratio was 40% in both aerobic and anoxic bioreactors. The sludge from primary settling tank was used as an external carbon source in anoxic bioreactor for de-nitrification.