Gehr R, Chen D, Moreau M
Department of Civil Engineering, McGill University, Montreal, QC H3A 2K6, Canada.
Water Sci Technol. 2009;59(1):89-96. doi: 10.2166/wst.2009.761.
Performic acid, or PFA (CH(2)O(3)), is a well-known oxidizing agent and disinfectant in the medical field and food industry. It has recently become available on a commercial scale for potential use in wastewater disinfection. This study investigated its application to an advanced primary effluent which is recalcitrant to disinfection by UV and peracetic acid (PAA). Methods were developed for determining PFA concentrations in stock solutions as well as in residual concentrations in the wastewater. Batch and continuous-flow pilot studies showed a correlation between log fecal coliform removals and PFA doses. A PFA dose of approximately 3.4 mg/L and a contact time of 45 minutes could achieve 3-logs removal, and almost total disinfection could be achieved using a dose of 6 mg/L. The by-products of PFA addition are hydrogen peroxide and formic acid (CHOOH), neither of which is considered to be toxic to aquatic fauna at the doses required for disinfection.
过甲酸（PFA，化学式为CH₂O₃）是医学领域和食品工业中一种知名的氧化剂和消毒剂。它最近已实现商业规模生产，有望用于废水消毒。本研究调查了其在紫外线和过氧乙酸（PAA）难以消毒的高级原废水中的应用。开发了测定储备溶液中PFA浓度以及废水中残留浓度的方法。间歇式和连续流中试研究表明，对数粪便大肠菌群去除率与PFA剂量之间存在相关性。约3.4 mg/L的PFA剂量和45分钟的接触时间可实现3个对数级的去除，使用6 mg/L的剂量几乎可实现完全消毒。添加PFA的副产物是过氧化氢和甲酸（CHOOH），在消毒所需剂量下，这两种副产物对水生动物均无毒性。
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