Effect of different molecular weight organic components on the increase of microbial growth potential of secondary effluent by ozonation

Zhao, Xin; Hu, Hong-Ying; Yu, Ting; Su, Chang; Jiang, Haochi; Liu, Shuming

doi:10.1016/j.jes.2014.09.001

Cited by 30 publications

(16 citation statements)

References 31 publications

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“…Regrowth may have resulted from the combination of treatment survival and capacity to use any available carbon and energy sources. Indeed, the occurrence of microbial regrowth after water treatment has been attributed to the presence of assimilable organic carbon, generated during the oxidation of recalcitrant organic matter (Thayanukul et al, 2013;Zhao et al, 2014). The comparison of the regrowth capacity in the presence of light or in the dark, suggested that light may have facilitated the recovery of cell injuries, mainly in bacterial heterotrophs and fungi (Fig.…”

Section: Microbial Inactivation and Reactivationmentioning

confidence: 99%

Photocatalytic ozonation of urban wastewater and surface water using immobilized TiO2 with LEDs: Micropollutants, antibiotic resistance genes and estrogenic activity

et al. 2016

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Photocatalytic ozonation was employed for the first time in continuous mode with TiO2-coated glass Raschig rings and light emitting diodes (LEDs) to treat urban wastewater as well as surface water collected from the supply area of a drinking water treatment plant (DWTP). Different levels of contamination and types of contaminants were considered in this work, including chemical priority substances (PSs) and contaminants of emerging concern (CECs), as well as potential human opportunistic antibiotic resistant bacteria and their genes (ARB&ARG). Photocatalytic ozonation was more effective than single ozonation (or even than TiO2 catalytic ozonation) in the degradation of typical reaction by-products (such as oxalic acid), and more effective than photocatalysis to remove the parent micropollutants determined in urban wastewater. In fact, only fluoxetine, clarithromycin, erythromycin and 17-alpha-ethinylestradiol (EE2) were detected after photocatalytic ozonation, by using solid-phase extraction (SPE) pre-concentration and LC-MS/MS analysis. In surface water, this treatment allowed the removal of all determined micropollutants to levels below the limit of detection (0.01-0.20 ng L(-1)). The efficiency of this process was then assessed based on the capacity to remove different groups of cultivable microorganisms and housekeeping (16S rRNA) and antibiotic resistance or related genes (intI1, blaTEM, qnrS, sul1). Photocatalytic ozonation was observed to efficiently remove microorganisms and ARGs. Although after storage total heterotrophic and ARB (to ciprofloxacin, gentamicin, meropenem), fungi, and the genes 16S rRNA and intI1, increased to values close to the pre-treatment levels, the ARGs (blaTEM, qnrS and sul1) were reduced to levels below/close to the quantification limit even after 3-days storage of treated surface water or wastewater. Yeast estrogen screen (YES), thiazolyl blue tetrazolium reduction (MTT) and lactate dehydrogenase (LDH) assays were also performed before and after photocatalytic ozonation to evaluate the potential estrogenic activity, the cellular metabolic activity and the cell viability. Compounds with estrogenic effects and significant differences concerning cell viability were not observed in any case. A slight cytotoxicity was only detected for Caco-2 and hCMEC/D3 cell lines after treatment of the urban wastewater, but not for L929 fibroblasts.

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Section: Microbial Inactivation and Reactivationmentioning

confidence: 99%

Photocatalytic ozonation of urban wastewater and surface water using immobilized TiO2 with LEDs: Micropollutants, antibiotic resistance genes and estrogenic activity

et al. 2016

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“…Besides, Thayanukul et al (2013) investigated 6 WRPs in Japan and claimed that AOC levels of secondary effluent and tertiary effluent from various processes were 66-138 μg/L and 36-446 μg/L (median: 316 μg/L) respectively. In addition, based on 5 WRPs in China, Zhao et al (2014aZhao et al ( , 2014b concluded that AOC levels of secondary effluent and tertiary effluent from various processes were 57-8150 μg/L (median: 223 μg/L) and 22-3036 μg/L (median: 870 μg/ L) respectively. As can be seen from Fig.…”

Section: Typical Aoc Levels Of Drinking Water and Reclaimed Watermentioning

confidence: 99%

“…Ozonation has been widely used for water and wastewater treatment and disinfection processes due to its strong oxidizability (Singh et al, 2008;Tripathi et al, 2011;Zhao et al, 2014b). However, sharp increases of AOC levels after ozonation have been discovered in both drinking water and reclaimed water treatment processes.…”

Section: Ozonationmentioning

confidence: 99%

“…However, sharp increases of AOC levels after ozonation have been discovered in both drinking water and reclaimed water treatment processes. For instance, in reclaimed water, several papers found that ozonation increased AOC by 3-7 times and a higher ozone dosage led to an elevated AOC production (Wert et al, 2007;Thayanukul et al, 2013;Zhao et al, 2014b).…”

Section: Ozonationmentioning

confidence: 99%

“…In drinking water treatment, biological activated carbon (BAC) or biological filters are often equipped after ozonation for subsequent treatment of byproducts so as to ensure a good quality of the final effluent (Polanska et al, 2005;Wert et al, 2007). While in reclaimed water treatment systems, ozonation is usually installed after sand filtration, membrane filtration and other biological treatment processes and is regarded as the last process before disinfection (Zhao et al, 2014b). In future system designs, it is indispensable to apply proper subsequent treatment to control AOC after ozonation.…”

Section: Ozonationmentioning

confidence: 99%

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Assimilable organic carbon (AOC) variation in reclaimed water: Insight on biological stability evaluation and control for sustainable water reuse

Chen

Ngo

et al. 2018

Bioresource Technology

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This review highlights the importance of conducting biological stability evaluation due to water reuse progression. Specifically, assimilable organic carbon (AOC) has been identified as a practical indicator for microbial occurrence and regrowth which ultimately influence biological stability. Newly modified AOC bioassays aimed for reclaimed water are introduced. Since elevated AOC levels are often detected after tertiary treatment, the review emphasizes that actions can be taken to either limit AOC levels prior to disinfection or conduct post-treatment (e.g. biological filtration) as a supplement to chemical oxidation based approaches (e.g. ozonation and chlorine disinfection). During subsequent distribution and storage, microbial community and possible microbial regrowth caused by complex interactions are discussed. It is suggested that microbial surveillance, AOC threshold values, real-time field applications and surrogate parameters could provide additional information. This review can be used to formulate regulatory plans and strategies, and to aid in deriving relevant control, management and operational guidance.

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Removal of intl1 and associated antibiotics resistant genes in water, sewage sludge and livestock manure treatments

Liao

Chen

2018

Rev Environ Sci Biotechnol

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Effect of different molecular weight organic components on the increase of microbial growth potential of secondary effluent by ozonation

Cited by 30 publications

References 31 publications

Photocatalytic ozonation of urban wastewater and surface water using immobilized TiO2 with LEDs: Micropollutants, antibiotic resistance genes and estrogenic activity

Photocatalytic ozonation of urban wastewater and surface water using immobilized TiO2 with LEDs: Micropollutants, antibiotic resistance genes and estrogenic activity

Assimilable organic carbon (AOC) variation in reclaimed water: Insight on biological stability evaluation and control for sustainable water reuse

Removal of intl1 and associated antibiotics resistant genes in water, sewage sludge and livestock manure treatments

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