摘要
Effluent organic matter (EfOM) from municipal wastewater treatment plants is an emerging concern because of its refractory and potential risk to ecological environment. Herein, this investigation comprehensively evaluated the effects of HO • and O 3 exposures on EfOM transformation and micropollutant degradation under different pre-coagulation operating conditions during ozonation. Compared to coagulation and ozonation alone, coupling two processes could effectively reduce total organic carbon, color and UV 254 of effluent. Fe-based coagulant was easier to combine with OH − to generate floc in bulk than Al-based coagulant for EfOM capture, which could decrease total scavenging capacities of effluents as well as increase the exposures of O 3 and HO • during ozonation, enhancing ozonation efficiency for EfOM degradation. EfOM from membrane bioreactor treatment was more difficult to capture during pre-coagulation but more easily degraded during ozonation than that from conventional activated sludge treatment due to its lower molecular weight distribution and higher contents of humic-like and tryptophan-like substances. Parallel factor analysis shows that coagulation combined with ozonation breaks the fluorescent groups of humic-like and tryptophan-like substances effectively. Molecular weight distribution determination indicates that coupling two processes could more effectively remove humic-like substances, organic colloids and polysaccharides compared to coagulation or ozonation alone. Furthermore, micropollutants with higher energy of highest occupied molecular orbital were degraded more efficiently during ozonation. The investigation reveals that O 3 utilization efficiency for micropollutant degradation can be significantly improved by pre-coagulation, offering new ideas for reducing energy consumption during advanced ozonation treatment and ensuring the safety of effluent and sustainable water reuse.
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