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Influence of hydraulic retention time on heterotrophic biomass in a wastewater moving bed membrane bioreactor treatment plant
Martín-Pascua, J.; Reboleiro-Rivas, P.; López-López, C.; González-López, J.; Hontoria, E. & Poyatos, J.M.
Abstract
Wastewater treatment using moving bed
membrane bioreactor technology was tested with real
urban wastewater at a pilot plant, combining moving bed
treatment as a biological process with hybrid biomass
(suspended and fixed) and the advantages of a membrane
separation system. The evolution of the kinetic constants of
the hybrid biomass and organic matter removal were
studied in a pilot plant under different operational conditions,
by varying hydraulic retention time (HRT), mixed
liquor suspended solids (MLSS) and temperature, and
considering the attached biomass of the carrier and the
dispersed biomass of the flocs to reproduce real treatment
conditions. The rates of organic matter removal were
97.73 ± 0.81 % of biochemical oxygen demand (BOD5),
93.44 ± 2.13 % of chemical oxygen demand (COD),
94.41 ± 2.26 % of BOD5 and 87.62 ± 2.47 % of COD
using 24.00 ± 0.39 and 10.00 ± 0.07 h of HRT, respectively.
The influence of the environmental variables and
operational conditions on kinetic constants was studied; it
was determined that the most influential variable for the
decay coefficient for heterotrophic biomass was HRT
(0.34 ± 0.14 and 0.31 ± 0.10 days-1 with 10.00 ± 0.07
and 24.00 ± 0.39 h of HRT, respectively), while for heterotrophic
biomass yield, this was temperature (0.61 ± 0.04
and 0.52 ± 0.06 with 10.00 ± 0.07 and 24.00 ± 0.39 h of
HRT, respectively). The results show that introducing carriers
in an MBR system provides similar results for organic
matter removal, but with a lower concentration of MLSS.
Keywords
Moving bed; Membrane bioreactor; Temperature; Hydraulic retention time
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