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Abstract：
Water reclamation plants (WRPs) are facing the challenges of ensuring microbial safety and require efficient disinfection systems. Sequential ozone‑chlorine disinfection is supposed to be a favorable alternative for reclaimed water disinfection. This study compared the inactivation efficiency of E.coli by single ozone, single chlorine, and sequential ozone‑chlorine disinfection approaches. Notably, a single ozone or chlorine process could only achieve a log removal rate of up to 5 log, whereas the sequential ozone‑chlorine disinfection could completely inactivate microorganisms (7.3 log). For sequential ozone‑chlorine disinfection, the efficiency of chlorination was improved by 2.4%-18.5%. The synergistic effect mainly attributed to the elimination of chlorine consuming substances by ozone. Through the chlorine decay model (CRS) fitting and calculating the integral CT value, the enhancement ability of ozone to chlorine disinfection was quantified. By introducing an enhancement coefficient (β), a succinct and accurate model was established to estimate the inactivation rate of sequential ozone‑chlorine disinfection (mean absolute percentage error: 0.035). The results and methodology of this study are informative to optimize the disinfection units of WRPs.
摘要：
水再生厂（WRP）面临着确保微生物安全的挑战，需要有效的消毒系统。顺序臭氧-氯消毒被认为是再生水消毒的有利替代方案。本研究比较了单一臭氧对大肠杆菌的灭活效率,单氯，和顺序臭氧氯消毒方法。值得注意的是,单一的臭氧或氯工艺只能实现高达5对数的对数去除率，而顺序的臭氧-氯消毒可以完全灭活微生物（7.3log）。对于顺序臭氧-氯消毒，氯化效率提高了2.4%-18.5%。协同效应主要归因于臭氧消除了氯消耗物质。通过对氯衰变模型(CRS)的拟合和计算积分CT值,量化了臭氧对氯消毒的增强能力。通过引入增强系数(β)，建立了一个简洁准确的模型来估算顺序臭氧氯消毒的失活率（平均绝对百分比误差：0.035）。这项研究的结果和方法可为优化WRP的消毒单位提供信息。
