Identification of wastewater sludge characteristics to predict critical flux for membrane bioreactor processes

Nitrifier characteristics in submerged membrane bioreactors under different sludge retention times

“…A long SRT, at the same time, will permit a stable treatment and low excess sludge production (Fan et al, 2005;Howell et al, 2003). The higher biomass concentration also increases shock tolerance, which is particularly important where feed is highly variable (Bin et al, 2009).…”

Sludge filterability and dewaterability in a membrane bioreactor for municipal wastewater treatment

“…This has led to a considerable interest in the process by both academic researchers and practitioners: an easy survey on scientific search engines indicates that the number of items including the terms "membrane bioreactor" in the title and "wastewater" in the full text increased with an exponential trend during last 15 years, with its value doubled in the last three years [1]. So far, most of researches have been focused on understanding the mechanisms governing membrane fouling, with a special attention to the impact of membrane scouring aeration [2,3,4], the effect of soluble microbial products and extracellular polymeric substances [5,6,7] and the applicability of the critical flux concept for a more sustainable operation of the process [8,9,10]. More recently a growing interest in the application of conventional activated sludge models ASM 1, ASM2d and ASM3 has spread throughout scientific community [11,12,13] aimed at predicting the performances of the process under various operational conditions which are in some cases extremely different than the typical ones of conventional activated sludge.…”

Effect of Powdered Activated Carbon to Reduce Fouling in Membrane Bioreactors: A Sustainable Solution. Case Study

“…Fan et al [22] considered the effects of sludge characteristics on critical flux using a submerged MBR pilot plant applied to urban wastewater working at different operative conditions. Similar results were obtained by Wang et al [23] in a submerged membrane bioreactor under sub-critical flux operation.…”