Can veterinary antibiotics affect constructed wetlands performance during treatment of livestock wastewater?

Almeida, C. Marisa R.; Santos, Flávia Carvalho; Ferreira, Ana Catarina; Lourinha, Iolanda; Basto, M. Clara P.; Mucha, Ana P.

doi:10.1016/j.ecoleng.2017.02.035

Cited by 34 publications

(25 citation statements)

References 17 publications

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“…In general, although CW operating conditions and influent loads can influence the rates of elimination of nutrients and removal yields might vary considerably, in the present study, organic matter and ammonium removal rates were similar to those already reported for bench-scale [33] and full-scale [17,20] CW systems. Thus, the CW microcosms assembled were working adequately, simulating a real CW system throughout the experimental period.…”

Section: Discussionsupporting

confidence: 90%

“…A primary role of CWs is the removal of organic matter and nutrients. In the present study, high removal percentages were observed for both organic matter and ammonium after adaption of the system to the lake water and its stabilization, a feature previously observed [33]. Organic matter removal results from a combination of physical and microbial mechanisms, namely, physical retention in the substrate, which results in microorganisms' proliferation and biodegradation [34].…”

Section: Discussionsupporting

confidence: 74%

“…The presence of plants (P. australis) in the CWs can also increase the microbial activity, for instance through release of exudate compounds, leading to increased removal by biodegradation of pollutants, in the present case microcystins, along with other organic matter [20]. As mentioned above, plants can also biostimulate the microbial rhizosphere by rhizosphere aeration [33]. Thus, biodegradation can be a significant MC removal process in CWs.…”

Section: Discussionmentioning

confidence: 89%

“…Nitrate removal also depends on denitrification processes, which in the present study were not effective as no significant nitrate removal was observed. Denitrification is the process in which nitrate is converted into dinitrogen via intermediate nitrite, nitric oxide, and nitrous oxide [33]. This result was expected as CWs with vertical water flow are known for their low nitrate removal rates.…”

Section: Discussionmentioning

confidence: 96%

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Assessment of Constructed Wetlands’ Potential for the Removal of Cyanobacteria and Microcystins (MC-LR)

Bavithra

Azevedo

Oliveira

et al. 2019

Water

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Microcystis blooms and the subsequent release of hepatotoxic microcystins (MCs) pose a serious threat to the safety of water for human and livestock consumption, agriculture irrigation, and aquaculture worldwide. Microcystin-LR (MC-LR), the most toxic variant of MCs, has been widely detected in a variety of environments such as water, sediments, plants, and many aquatic organisms. Conventional solutions of water treatment are costly, requiring specific infrastructure, as well as specialized personnel and equipment. Therefore, these solutions are not feasible in many rural areas or in the treatment of large reservoirs. In this regard, low-cost and low-technology solutions, such as constructed wetlands (CWs), are attractive solutions to treat surface waters contaminated with toxic cyanobacteria blooms from lakes, ponds, reservoirs, and irrigation systems. In line with this, the main aim of this work was to evaluate the potential of CWs for the treatment of water contaminated with MC-LR produced by Microcystis aeruginosa-LEGE 91094. For that, microcosms (0.4 × 0.3 × 0.3 m) simulating CWs were assembled with Phragmites australis to treat lake water contaminated with Microcystis aeruginosa cells and MCs. Results showed removal percentages of M. aeruginosa cells above 94% and about 99% removal of MC-LR during 1 week treatment cycles. CWs maintained their functions, regardless the presence of MC-LR in the system, and also showed significant removal of nutrients (ammonium ion removal up to 86%) and organic matter (removal reaching 98%). The present work indicates that CWs have the potential for removal of cyanobacterial cells and cyanotoxins, which can be useful for the treatment of eutrophic waters and provide water of sufficient quality to be used, for instance, in agriculture.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 96%

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Assessment of Constructed Wetlands’ Potential for the Removal of Cyanobacteria and Microcystins (MC-LR)

Bavithra

Azevedo

Oliveira

et al. 2019

Water

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“…In recent years, ARGs were regarded as fast-growing potential pollution because of the extensive application of antibiotics in the livestock industry [19][20][21]. Hence, effective treatment processes for antibiotic removal could also prevent the spread of ARGs.Constructed wetlands (CWs) are designed and constructed exploiting natural processes to treat rural wastewater [22,23]. The advantages of CWs mainly lie in high purification removal, relatively low construction and maintenance costs, reduced energy consumption, convenient operation, and broad application prospects in developing countries or rural areas [24,25].…”

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confidence: 99%

Constructed Wetland Revealed Efficient Sulfamethoxazole Removal but Enhanced the Spread of Antibiotic Resistance Genes

Zhang

et al. 2020

Molecules

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Constructed wetlands (CWs) could achieve high removal efficiency of antibiotics, but probably stimulate the spread of antibiotic resistance genes (ARGs). In this study, four CWs were established to treat synthetic wastewater containing sulfamethoxazole (SMX). SMX elimination efficiencies, SMX degradation mechanisms, dynamic fates of ARGs, and bacterial communities were evaluated during the treatment period (360 day). Throughout the whole study, the concentration of SMX in the effluent gradually increased (p < 0.05), but in general, the removal efficiency of SMX remained at a very high level (>98%). In addition, the concentration of SMX in the bottom layer was higher compared with that in the surface layer. The main byproducts of SMX degradation were found to be 4-amino benzene sulfinic acid, 3-amino-5-methylisoxazole, benzenethiol, and 3-hydroxybutan-1-aminium. Temporally speaking, an obvious increase of sul genes was observed, along with the increase of SMX concentration in the bottom and middle layers of CWs. Spatially speaking, the concentration of sul genes increased from the surface layer to the bottom layer.

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Constructed Wetlands for Industrial Wastewater Remediation

Kumar,

Singh,

Prajapati

et al. 2023

Environmental Science and Engineering

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Can veterinary antibiotics affect constructed wetlands performance during treatment of livestock wastewater?

Cited by 34 publications

References 17 publications

Assessment of Constructed Wetlands’ Potential for the Removal of Cyanobacteria and Microcystins (MC-LR)

Assessment of Constructed Wetlands’ Potential for the Removal of Cyanobacteria and Microcystins (MC-LR)

Constructed Wetland Revealed Efficient Sulfamethoxazole Removal but Enhanced the Spread of Antibiotic Resistance Genes

Constructed Wetlands for Industrial Wastewater Remediation

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