Comparing the Sludge Characteristics in a Moving Bed Membrane Bioreactor and Conventional Membrane Bioreactor
Document Type : Full Length Article
Authors
1 Department of Environmental Engineering, Faculty of Environment, University of Tehran
2 Department of Environmental Engineering, Faculty of Water and Environmental Engineering, Abbaspour University of Technology
Abstract
The properties of excess sludge wasted from two parallel pilot plants membrane bioreactor (MB-MBR and conventional MBR) have been monitored. Sludge samples of MB-MBR and MBR have been examined and compared in terms of VSS/TSS, filtration index, EPS and SMP concentration, nitrogen and phosphorous in dry matter, FI, SVI and polyelectrolyte requirement for sludge conditioning. By keeping similar operational conditions (organic loading, F/M, HRT, temperature, and pH) in both reactors, their sludge characteristics in some terms were significantly different. Results showed that the direct correlation between sludge stabilization ratio and SRT and stabilization ratio in MB-MBR process was 15% higher than stabilization ratio in MBR process. In MB-MBR reactor the SMP and EPS concentration were higher than MBR process. Polyelectrolyte requirement for sludge conditioning in both processes was in range of 4-5 g/kg dry solids and no significant difference was observed. In MB-MBR process SND occurs, and also its excess sludge has higher quality especially in terms of stabilization ratio, nutrient content and higher fertility value.
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Main Subjects
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