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Fouling in membrane bioreactors used in wastewater treatment
Transcript of Fouling in membrane bioreactors used in wastewater treatment
Biological degradation process (Active sludge)
with a direct solid-liquid separation by membrane filtraion 0.05 ~ 0.4 um pore size Advantage 1. small footprint 2. high effluent quality 3. good disinfection capability 4. higher volumetric loading 5. less sludge production Introduction $ 216 milion 363 milion 2006 2010 History 1960s, the MBR process was introduced. (UF and MF were available), by Dorr-Olivier Inc. Crossflow type, flat sheet membranes (0.003~0.01 um) High cost, low economic value of the product, potential rapid loss of performance due to fouling BUT, early MBRs were operated at SRT as high as 100 days, MLSS up to 30,000 mg/L.
Recently, SRT : 10~20 days, MLSS 10,000~15,000 mg/L The economic viability of the current generation of MBRs depends on the achievable permeate flux,
mainly controlled by effective fouling control with modest energy input ( typically < 1 kWh/m3) 1989, 2nd generation MBR introduced by Yamaoto et al. Submerged type, two-phase bubbly flow to control fouling Fouling mechanisms for compmex fluids Fouling components (MF, UF) such as bacteria, yeast, proteins, and colloids focused on the pH variation, salt concentration cross flow, concentration membrane hydrophilicity membrane pore size, flux Concepts of critical and sustainable flux in mixed species environment Optimizing flux to control fouling has been pursued since the mid-1980s