MBR-13: Process optimisation and biomass characterisations

IRSA

10/2006 - 09/2009

The investigation of membrane bioreactors for municipal wastewater treatment in terms of their biological features is critical for the definition of optimal process conditions. The effectiveness of MBRs in achieving effluent standards depends on a range of operational conditions, but the technology is rather tolerant to variations of the main parameters. However, optimised process management practices can be defined as those maximising treatment performance with respect to operational costs. The latter largely depend on membrane cleaning, sludge wastage, and aeration, and these variables are all affected by the sludge concentration and biomass properties within MBRs.

In this context, research activities will be aimed at optimising biological process parameters and defining biomass characteristics that can serve as a basis for monitoring and modelling the behaviour of MBRs treating domestic sewage. Experimental tests will be done at the bench and/or pilot scale with submerged MBRs and will be focused on testing different process conditions defined by operational parameters such as loading rates, sludge age, permeate flux (i.e. HRT), recycle ratios, etc. Biological processes will be monitored by respirometric determination of biomass activity and sludge characterisation. The latter will include the measurement of chemical parameters (e.g. EPS, SMP), sludge filterability (CST, SRF, etc.), and viscosity.

The experimental results will be used for fitting existing models (e.g. ASM) and/or investigating new modelling approaches that may be useful for the design and management of membrane bioreactors in terms of maximised process efficiency and minimised plant and operating costs.