Organic Matter Removal Under High Loads in a Fixed-Bed Sequencing Batch Reactor with Peach Pit as Carrier

摘要

In this study, the evaluation of organic matter removal at high loads from synthetic wastewater was performed using a Fixed-bed Sequencing Batch Reactor (FSBR), in which peach pits were used instead of conventional carriers. The FSBR performance on organic matter removal at different organic loading rates (2-12 kg COD m~(-3) d~(-1)) was significant. Organic matter removal efficiency was ＞90% at a loading rate less than 7.2 kg COD m~(-3) d~(-1). When the organic loading was 12 kg COD m~(-3) d~(-1), organic matter removal in the FSBR and SBR reactors reached 71.84 and 56.57%, respectively, indicating that the FSBR performance is significantly higher than the SBR reactor. According to the higher efficiency of SBR with media, this comparison shows that bio-film bioactivity (7.06 ± 0.3 mg O_2 mg-VSS~(-1) d~(-1)) is significantly higher than suspended biomass bioactivity (2.92 ± 0.149 mg O_2 mg-VSS~(-1) d~(-1)). As the OLR increased from 3.4 to 10 kg COD m~(-3) d~(-1), the observed yield (Y_(obs)), the specific biomass growth rate (μ_(overal)) and the endogenous decay rate (k_d) increased from 0.018 to 0.02 g VSS g~(-1) COD~(-1), 0.1 to 0.2 d~(-1) and from 0.082 to 0.067 d~(-1), respectively, while the solid retention time (SRT) decreased from 40 to 19.8 d.