Matavos-Aramyan Sina, Moussavi Mohsen, Matavos-Aramyan Hedieh, Roozkhosh Sara
Young Researchers and Elite Club, Shiraz Branch, Islamic Azad University, Shiraz, Iran; Department of Chemical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran; Raazi Environmental Protection Foundation (R.E.P.F.), Fars Science and Technology Park, P.O. Box: 71955-137, Shiraz, Iran.
Department of Chemical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran.
Free Radic Biol Med. 2017 May;106:158-167. doi: 10.1016/j.freeradbiomed.2017.02.030. Epub 2017 Feb 27.
Three novel modified advanced oxidation process systems including ascorbic acid-, pro-oxidants- and ascorbic acid-pro-oxidants-modified Fenton system were utilized to study the disinfection efficiency on Cryptosporidium-contaminated drinking water samples. Different concentrations of divalent and trivalent iron ions, hydrogen peroxide, ascorbic acid and pro-oxidants at different exposure times were investigated. These novel systems were also compared to the classic Fenton system and to the control system which comprised of only hydrogen peroxide. The complete in vitro mechanism of the mentioned modified Fenton systems are also provided. The results pointed out that by considering the optimal parameter limitations, the ascorbic acid-modified Fenton system decreased the Cryptosporidium oocytes viability to 3.91%, while the pro-oxidant-modified and ascorbic acid-pro-oxidant-modified Fenton system achieved an oocytes viability equal to 1.66% and 0%, respectively. The efficiency of the classic Fenton at optimal condition was observed to be 20.12% of oocytes viability. The control system achieved 86.14% of oocytes viability. The optimum values of the operational parameters during this study are found to be 80mgL for the divalent iron, 30mgL for ascorbic acid, 30mmol for hydrogen peroxide, 25mgL for pro-oxidants and an exposure time equal to 5min. The ascorbic acid-pro-oxidants-modified Fenton system achieved a promising complete water disinfection (0% viability) at the optimal conditions, leaving this method a feasible process for water disinfection or decontamination, even at industrial scales.
三种新型改良高级氧化工艺系统，包括抗坏血酸改性、促氧化剂改性以及抗坏血酸 - 促氧化剂改性的芬顿系统，被用于研究对受隐孢子虫污染的饮用水样本的消毒效率。研究了不同浓度的二价和三价铁离子、过氧化氢、抗坏血酸以及促氧化剂在不同暴露时间下的情况。这些新型系统还与经典芬顿系统以及仅由过氧化氢组成的对照系统进行了比较。同时还提供了上述改良芬顿系统完整的体外作用机制。结果指出，考虑到最佳参数限制，抗坏血酸改性的芬顿系统可将隐孢子虫卵囊活力降低至3.91%，而促氧化剂改性和抗坏血酸 - 促氧化剂改性的芬顿系统分别使卵囊活力达到1.66%和0%。在最佳条件下，经典芬顿系统的效率为卵囊活力的20.12%。对照系统的卵囊活力为86.14%。本研究中操作参数的最佳值为：二价铁80mg/L、抗坏血酸30mg/L、过氧化氢30mmol、促氧化剂25mg/L以及暴露时间为5分钟。抗坏血酸 - 促氧化剂改性的芬顿系统在最佳条件下实现了有前景的完全水消毒（活力为0%），这使得该方法即使在工业规模下也是一种可行的水消毒或去污工艺。
