Effects Of Hydraulic Retention Time,
Temperature, And MLSS Concentration On The
Effluent Quality Of A Membrane Bioreactor
Author(s)
J. M. Poyatos, M. Molina-Muñoz, J. González-López
& E. Hontoria
Abstract
The performance of a bench-scale submerged membrane bioreactor (MBR)
equipped with ultrafiltration membranes (ZENON®) was investigated. The
running of the plant consisted of 10 min cycles: a cycle included 9 min 45 sec of
filtration and a 15 sec back flush cycle. Three different hydraulic retention times
(HRT) were utilized (8.05, 11.71 and 15.27 h) at several different concentrations
of MLSS. The pilot plant was located at the wastewater treatment plant of the
city of Granada (Puente de los Vados, Granada, Spain).
The results showed that the MBR systems were highly efficient at removing
organic matter (COD and BOD5), suspended solids, turbidity, colour and
microbial indicators (E. coli and coliphages) in the urban wastewater. Statistical
analysis of the data indicated that the hydraulic retention time was the parameter
which most affected the elimination of BOD5, as reflected by the significant
statistical differences. However, E. coli and coliphages were practically removed
in the MBR system independently of the HRT values, temperature and MLSS
concentrations utilized in the experiment. Likewise, coliphages were virtually
eliminated, and no relationship was found between this elimination and HRT
influence, temperature, or MLSS concentration.
Keywords: membrane bioreactor, wastewater reuse, ultrafiltration, water
quality.
Keywords
membrane bioreactor, wastewater reuse, ultrafiltration, water
quality.
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