Various biological wastewater treatment options are available, which can be categorized into two types: suspended growth processes and attached growth processes. A recent innovation in this realm is the sequencing batch moving-bed biofilm reactor (SBMBBR), which combines moving bed biofilm reactor (MBBR) and sequencing batch reactor (SBR) processes. This system harnesses the benefits of attached growth, suspended growth, and SBR systems. In this study, the efficacy of carriers i.e., ceramic rings and K1 biofilter in removing nitrate and phenol in anoxic/aerobic and anaerobic conditions. Ceramic rings have a dense structure with numerous pores that provide a habitat for beneficial bacteria. A K1 biofilter is a type of biological filtration system used in environmental engineering to treat wastewater and remove organic and inorganic pollutants from water. Under anoxic conditions, the maximum nitrate removal was 93.9% at contact time of 90 min for Ceramic rings and 78.9% at contact time of 75 min for K1 Biofilter. Similarly, under anaerobic conditions, the maximum nitrate removal was 72.4% at contact time of 105 min for Ceramic rings and 66.7% at contact time of 120 min for K1 Biofilter. Under aerobic conditions, maximum phenol removal was 84% at contact time of 105 min for Ceramic rings and 95% at contact time of 90 min for K1 Biofilter. Similarly, under anaerobic conditions, the maximum phenol removal was 74.5% at contact time of 105 min for Ceramic rings and 81.5% at contact time of 90 min respectively for K1 Biofilter.