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【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

报告时间:5月17日 下午14:30
报告地点:二楼报告厅
联系人:
邵嘉慧

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. 

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