Inactivation of fungal spores in water using ozone: Kinetics, influencing factors and mechanisms

Wen, Gang; Liang, Zhiting; Xu, Xiangqian; Cao, Ruihua; Wan, Qiqi; Ji, Gang; Lin, Wei; Wang, Jingyi; Yang, Jingjing; Huang, Tinglin

doi:10.1016/j.watres.2020.116218

Cited by 66 publications

(34 citation statements)

References 62 publications

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“…The oxidative reaction is very quick. Generally, the concentration of residual ozone is halved in the first 30 s [ [26] , [27] , [28] ] and reaches at least a 1-log inactivation [ 29 ]. It is reported that oxidation of proteins by ozone mainly occurs at the tyrosine, tryptophan, histidine, cysteine, and methionine residues, resulting in the abnormal folding ability and changed higher order structures [ 30 ].…”

Section: The Virus Removal By Ozonationmentioning

confidence: 99%

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The virus removal in UV irradiation, ozonation and chlorination

Kong

Ren

et al. 2021

Water Cycle

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The COVID-19 pandemic draws much attention to virus inactivation since the SARS-CoV-2 was detected in miscellaneous environments and the wastewater can be a potential transmitting pathway. UV irradiation, ozonation and chlorination are widely used disinfection processes in water treatment. In this review, the mechanisms and applications of three disinfection processes are introduced, and their inactivation effects on virus as well as other microorganisms are compared and discussed. The resistance of viruses to UV irradiation is generally stronger than that of bacteria. 4-log inactivation of bacteria can be easily obtained within a UV dose of 10 mJ/cm 2 . However, the doses to reach the same virus removal rate vary greatly from 10 to 140 mJ/cm 2 . The coronaviruses have even stronger UV resistance. Comparatively, ozonation and chlorination are effective methods to inactivate viruses, and the CT values of 4-log removal for most viruses concerned are lower than 1 mg·min/L and 10 mg·min/L, respectively. Protozoa, fungal spores and bacterial spores are more resistant to disinfection. Temperature, pH, organic matters, turbidity and other parameters all have influences on the disinfection. With a 10 °C decrease in temperature, the CT value required for certain removal rates doubles. Generally low pH promotes disinfection and high pH is against it. In drinking water and wastewater treatment process, the resistance properties of microorganisms and other influence parameters should be taken into consideration when choosing disinfection technologies.

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Section: The Virus Removal By Ozonationmentioning

confidence: 99%

“…However, the CT value is doubled (

=2.07) and fivefold (

=5.17) respectively at 5 °C [ 43 ]. The spores of Aspergillus niger, Trichoderma harzianum and Penicillium polonicum have smaller

s of 1.13, 1.33 and 1.50 respectively [ 29 ]. The sensitivity to temperature changes varies among different microbes.…”

Section: The Virus Removal By Ozonationmentioning

confidence: 99%

The virus removal in UV irradiation, ozonation and chlorination

Kong

Ren

et al. 2021

Water Cycle

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“…Aspergillus niger spores were produced as a reproductive propagule in solid media during the late growth stage. 14 Preparation of A. niger spores. Aspergillus niger CMCC98003 was acquired from the National Center for Medical Culture Collections (CMCC).…”

Section: Biomass Preparationmentioning

confidence: 99%

“…Previous studies have demonstrated that the biosorption capacity strongly depends on temperature. 14,15 Therefore, batch comparison experiments with US were conducted to investigate the biosorption capacity of FTPS at different temperatures (293, 303, and 313 K).…”

Section: Effect Of the Inuencing Parameters On Cr(vi) Biosorptionmentioning

confidence: 99%

Freezing/thawing pretreatment of dormant Aspergillus niger spores to increase the Cr(vi) adsorption capacity: process and mechanism

et al. 2021

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“…However, this long-standing point of view has been challenged by recent observations showing the emergence of large low-oxygen and hypoxic extents. The area affected by low oxygen in the bottom waters of the PRE was estimated to be around 1,000 km 2 in 2010 (Wen et al, 2020) and ~1,500 km 2 in 2015 (Li et al, 2018). With the increasing availability of observations, an apparent expansion of hypoxia with large interannual variations has been revealed from the data during 1976-2017 (Hu et al, 2021).…”

Section: Introductionmentioning

confidence: 98%

Interannual variabilities, long-term trends, and regulating factors of low-oxygen conditions in the eastern Pearl River Estuary

Chen

Wang

et al. 2022

Preprint

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Abstract. The summertime low-oxygen conditions in the Pearl River Estuary (PRE) have experienced a significant expansion in spatial extent associated with notable deoxygenation in recent decades. Nevertheless, there is still a lack of quantitative understanding of the long-term trends and interannual variabilities in oxygen conditions in the PRE as well as the driving factors, which was comprehensively investigated in this study using monthly observations in the eastern PRE during 1994–2018. To evaluate the changes in scope and intensity of oxygen conditions, an indicator (defined as the Low-oxygen Index, LOI) that integrates several metrics related to low-oxygen conditions was introduced through the principal component analysis (PCA). Moreover, primary physical and biogeochemical factors controlling the interannual variabilities and long-term trends in oxygen conditions were discerned, and their relative contributions were quantified by the multiple regression analysis. Results showed that the regression models explained over 60 % of the interannual variations in LOI. Both the wind speeds and concentrations of dissolved inorganic nitrogen (DIN) played a significant role in determining the interannual variations (by 39 % and 49 %, respectively) and long-term trends (by 39 % and 56 %, respectively) in LOI. Due to the increasing nutrient loads and alterations in physical conditions (e.g. the long-term decreasing trend in wind speeds), coastal eutrophication was exaggerated and massive marine-sourced organic matter was subsequently produced, thereby resulting in an expansion of intensified low-oxygen conditions. It has also driven a shift in the dominant source of organic matter from terrestrial inputs to in situ primary production, which has probably led to an earlier onset of hypoxia in summer. In summary, the eastern PRE has undergone considerable deterioration of low-oxygen conditions in the context of substantial changes in anthropogenic eutrophication and external physical factors.

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Inactivation of fungal spores in water using ozone: Kinetics, influencing factors and mechanisms

Cited by 66 publications

References 62 publications

The virus removal in UV irradiation, ozonation and chlorination

The virus removal in UV irradiation, ozonation and chlorination

Freezing/thawing pretreatment of dormant Aspergillus niger spores to increase the Cr(vi) adsorption capacity: process and mechanism

Interannual variabilities, long-term trends, and regulating factors of low-oxygen conditions in the eastern Pearl River Estuary

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