【环境讲坛50期】Using hydrogen peroxide as an anti-biofouling agent in membrane treatment
来源： 发布时间：2017-05-17 点击次数：
报告题目：Using hydrogen peroxide as an anti-biofouling agent in membrane treatment
报告人：Prof. Martin Reinhard
报告内容：There is an urgent need in many areas of water treatment to replace chlorine-based disinfectants with disinfectants that do not produce by-products and are less aggressive to membranes. Hydrogen peroxide (H2O2) is potentially useful to be used in membrane systems because it meets these requirements. Understanding the tolerance of thin-film composite (TFC) polyamide (PA) membranes to H2O2 was evaluated as part of a study to assess its usefulness as a biofouling control agent in reverse osmosis (RO) systems. The tolerance of the PA separation layer of a commercial RO membrane to H2O2 exposure was evaluated using a recirculating flat-sheet RO test system under corrosion-suppressed conditions. Membrane samples were exposed to 2.0 mM (68 mg/L), 10 mM (340 mg/L), 25 mM (850 mg/L) and 50 mM (1,700 mg/L) H2O2 for up to 24 days at 25 °C in phosphate buffer at pH 7.2 without and with methanol present. Membrane performance was evaluated by measuring water flux and rejection of phosphate buffer and acesulfame, a common organic wastewater indicator compound. Membrane breakdown was assessed by water flux increase and loss of solute rejection. Without methanol, the membrane was stable in 1,700 mg/L for at least 18 d, corresponding to a maximum tolerated dose (Dmax) of > 744,000 ppm-h. At initial concentrations of 20 mM methanol and exposure to 850 mg/L and 1,700 mg/L H2O2, membrane breakdown occurred after approximately 18 days and 10 days, corresponding to Dmax of 367,200 ppm-h and 408,000 ppm-h, respectively. The time to membrane breakdown was defined as decrease of salt rejection of at least 0.5% within 24 h. Membrane characterization employing X-ray photoelectron spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy with Energy Disperse Xray spectroscopy (SEM-EDS) failed to reveal membrane oxidation. The talk will also present results of exploratory microbiological studies on the effect of H2O2 on model bacteria and wastewater communities.
报告人简介：Prof. Martin Reinhard is Professor (Research) Emeritus in the Department of Civil & Environmental Engineering at Stanford University. He is also currently Visiting Professor in the Department of Civil & Environmental Engineering at the National University of Singapore (NUS). Prof. Reinhard’s research group works on a variety of freshwater issues, including desalination and trace organics removal using membrane processes, ecosystem enhancement via water reuse, artificial turf as a source of trace metal contamination, fate of microcontaminants in groundwater and estuaries, chlorination catalysis and natural and artificial groundwater recharge.