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article
Changes in Mixed Liquor and Organic Foulant Properties Affect Membrane Fouling for Non-Nitrifying and Nitrifying Biological Conditions
Abstract
A submerged membrane bioreactor treated settled municipal wastewater at a non-nitrifying solids retention time (SRT) condition (2 days) and a nitrifying SRT condition (10 days), to determine the effect of nitrification on mixed liquor properties and membrane fouling. Membrane fouling rates were almost 10 times greater at the 2-day SRT compared with the 10-day SRT, and results showed increased concentrations of high-molecular-weight organic molecules at the 2-day SRT. The Fourier transform infrared spectroscopy (FTIR) results of the fouled membrane from the 2-day SRT exhibited strong peaks for carbohydrates, while the fouled membrane from the 10-day SRT did not. This is consistent with the fact that, although the total carbohydrate soluble microbial product concentration was highest at the 10-day SRT, the carbohydrate consisted of mostly lowmolecular-weight (< 1 kDa) molecules, and 97% of this carbohydrate passed through the membrane at the 10-day SRT. Water Environ. Res., 81, 255 (2009).