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Organic matter removal under high loads in a fixed‐bed sequencing batch reactor with peach pit as carrier

2012; Wiley; Volume: 32; Issue: 3 Linguagem: Inglês

10.1002/ep.11685

1944-7450

Reza Darvishi Cheshmeh Soltani, Abbas Rezaee, Hatam Godini, Alireza Khataee, Sahand Jorfi,

Odor and Emission Control Technologies

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. © 2012 American Institute of Chemical Engineers Environ Prog, 32: 681–687, 2013