Removal of microorganisms and antibiotic resistance genes from treated urban wastewater: A comparison between aluminium sulphate and tannin coagulants

Grehs, Bárbara; Lopes, Ana Rita; Moreira, Nuno F.F.; Fernandes, Telma; Linton, Maria Angélica Oliveira; Silva, Adrián M.T.; Manaia, Célia M.; Carissimi, Élvis; Nunes, Olga C.

doi:10.1016/j.watres.2019.115056

Cited by 63 publications

(21 citation statements)

References 64 publications

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“…Obtained results displayed that, even though Al 2 (SO 4 ) 3 showed better performance, both the synthetic and natural-based ones were able to decrease turbidity, the colour of secondary treated urban wastewater. Additionally, both coagulants were capable of reducing the load of prokaryotic organisms up to two log units just after the treatment of the water [68]. In another study, tannins from Acacia mearnsii were tested for treating wastewater from dairy industries.…”

Section: Coagulants: Environmental Applicationmentioning

confidence: 99%

“…It achieved a total discoloration at a concentration of 180 mg/L while higher doses of iron sulphate (up to 240 mg/L) displayed a poor de-colorization (20%) and flocs settleability [70]. The lack of significant differences among coagulants in all the cases permits establishing that tannins from Acacia mearnsii tannins provide a green solution for the treatment of coloured and turbid effluents generated from very different wastewaters as those produced in urban areas, dye-houses, or dairy industries [66][67][68].…”

Section: Coagulants: Environmental Applicationmentioning

confidence: 99%

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Technological Application of Tannin-Based Extracts

et al. 2020

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Tannins are polyphenolic compounds naturally found in vegetables. Their presence in nature has prompted their historical use in many different ways. The revision of their traditional utilization has allowed their further modification aiming for an industrial application. Sometimes these modifications have implied the addition of harmful substances such as formaldehyde, classified as a carcinogen of category B1. In other cases, these natural tannins have been replaced by synthetic compounds that threaten human and animal health and damage the environment. Therefore, currently, both academy and industry are searching for the substitution of these unsafe complexes by the increasing inclusion of tannins, natural molecules that can be obtained from several and diverse renewable resources, modified using harmless additives. To achieve promising results, cost-efficient and eco-friendly extraction methods have been designed. Once these green alternatives have been isolated, they have been successfully applied to many fields with very assorted aims of utilization such as coagulants, adhesives, floatation agents, tannings, dyes, additives, or biomolecules. Therefore, this review offers a global vision of the full process that involves the tannin’s technological application including an overview of the most relevant tannin sources, effective extraction methods, and their utilization in very diverse fields.

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Section: Coagulants: Environmental Applicationmentioning

confidence: 99%

Section: Coagulants: Environmental Applicationmentioning

confidence: 99%

Technological Application of Tannin-Based Extracts

et al. 2020

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“…These processes provide advantages in reducing the load of disinfection units and help in complying to the stringent regulation standards. In view of biocoagulation/bioflocculation, limited research has been conducted [ 185 ]. The utilization of bacterium-based coagulants/flocculants also requires increasing the number of bacteria in the effluent, which could become a limitation of this technology.…”

Section: Limitations and Future Challengesmentioning

confidence: 99%

Challenges and Opportunities of Biocoagulant/Bioflocculant Application for Drinking Water and Wastewater Treatment and Its Potential for Sludge Recovery

Kurniawan

Abdullah

Imron

et al. 2020

IJERPH

195

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The utilization of metal-based conventional coagulants/flocculants to remove suspended solids from drinking water and wastewater is currently leading to new concerns. Alarming issues related to the prolonged effects on human health and further pollution to aquatic environments from the generated nonbiodegradable sludge are becoming trending topics. The utilization of biocoagulants/bioflocculants does not produce chemical residue in the effluent and creates nonharmful, biodegradable sludge. The conventional coagulation–flocculation processes in drinking water and wastewater treatment, including the health and environmental issues related to the utilization of metal-based coagulants/flocculants during the processes, are discussed in this paper. As a counterpoint, the development of biocoagulants/bioflocculants for drinking water and wastewater treatment is intensively reviewed. The characterization, origin, potential sources, and application of this green technology are critically reviewed. This review paper also provides a thorough discussion on the challenges and opportunities regarding the further utilization and application of biocoagulants/bioflocculants in water and wastewater treatment, including the importance of the selection of raw materials, the simplification of extraction processes, the application to different water and wastewater characteristics, the scaling up of this technology to a real industrial scale, and also the potential for sludge recovery by utilizing biocoagulants/bioflocculants in water/wastewater treatment.

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“…It was reported that the Moringa coagulant removed 83.05% COD, 82.2% color, 89.7% OP-HER (a reactive dye), and 78.4% RP-HE7B (a reactive dye). Grehs et al (2019) compared aluminum sulfate and tannin coagulant treatment to lower the amount of antibiotic-resistant genes in municipal wastewater. It was concluded that aluminum sulfate worked better than tannin for the eradication of resistant organisms.…”

Section: Chemical Processesmentioning

confidence: 99%

“…Grehs et al (2019) compared aluminum sulfate and tannin coagulant treatment to lower the amount of antibiotic‐resistant genes in municipal wastewater. It was concluded that aluminum sulfate worked better than tannin for the eradication of resistant organisms.…”

Section: Chemical Processesmentioning

confidence: 99%

Physico‐chemical processes

Yu¹,

Yao²,

Pan³

et al. 2020

Water Environment Research

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By summarizing 187 relevant research articles published in 2019, the review is focused on the research progress of physicochemical processes for wastewater treatment. This review divides into two sections, physical processes and chemical processes. The physical processes section includes three subsections , that is, adsorption, granular filtration, and dissolved air flotation, whereas the chemical processes section has five subsections , that is, coagulation/flocculation, advanced oxidation processes, electrochemical, capacitive deionization, and ion exchange.

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Removal of microorganisms and antibiotic resistance genes from treated urban wastewater: A comparison between aluminium sulphate and tannin coagulants

Cited by 63 publications

References 64 publications

Technological Application of Tannin-Based Extracts

Technological Application of Tannin-Based Extracts

Challenges and Opportunities of Biocoagulant/Bioflocculant Application for Drinking Water and Wastewater Treatment and Its Potential for Sludge Recovery

Physico‐chemical processes

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