Triclosan removal in wetlands constructed with different aquatic plants

Liu, Jianing; Wang, Jingmin; Zhao, Chao; Hay, Anthony G.; Xie, Huijun; Zhan, Jian

doi:10.1007/s00253-015-7063-6

Cited by 46 publications

(13 citation statements)

References 44 publications

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“…reported that the diversity and richness of bacteria in planted beds was higher than that in unplanted beds. In addition, Liu et al 22. showed that the root systems of aquatic plants (emergent cattail, submerged hornwort, and floating Lemna minor ) have selective effects on the microbial communities in wetlands, and wetlands with Cattail showed the highest community richness and diversity.…”

Section: Discussionmentioning

confidence: 99%

Responses of bacterial community structure and denitrifying bacteria in biofilm to submerged macrophytes and nitrate

Zhang

Pang

Wang

et al. 2016

Sci Rep

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Submerged macrophytes play important roles in constructed wetlands and natural water bodies, as these organisms remove nutrients and provide large surfaces for biofilms, which are beneficial for nitrogen removal, particularly from submerged macrophyte-dominated water columns. However, information on the responses of biofilms to submerged macrophytes and nitrogen molecules is limited. In the present study, bacterial community structure and denitrifiers were investigated in biofilms on the leaves of four submerged macrophytes and artificial plants exposed to two nitrate concentrations. The biofilm cells were evenly distributed on artificial plants but appeared in microcolonies on the surfaces of submerged macrophytes. Proteobacteria was the most abundant phylum in all samples, accounting for 27.3–64.8% of the high-quality bacterial reads, followed by Chloroflexi (3.7–25.4%), Firmicutes (3.0–20.1%), Acidobacteria (2.7–15.7%), Actinobacteria (2.2–8.7%), Bacteroidetes (0.5–9.7%), and Verrucomicrobia (2.4–5.2%). Cluster analysis showed that bacterial community structure can be significantly different on macrophytes versus from those on artificial plants. Redundancy analysis showed that electrical conductivity and nitrate concentration were positively correlated with Shannon index and operational taxonomic unit (OTU) richness (log10 transformed) but somewhat negatively correlated with microbial density. The relative abundances of five denitrifying genes were positively correlated with nitrate concentration and electrical conductivity but negatively correlated with dissolved oxygen.

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Section: Discussionmentioning

confidence: 99%

Responses of bacterial community structure and denitrifying bacteria in biofilm to submerged macrophytes and nitrate

Zhang

Pang

Wang

et al. 2016

Sci Rep

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“…Loss of triclosan from the soil pots in the present study may also have been the result of microbial degradation. In 1 study conducted by Liu et al on the potential for constructed wetlands to remove triclosan, results suggested that an abundance of alpha‐ and gamma‐ Proteobacteria could be important in the microbial degradation of triclosan. Furthermore, the extent to which triclosan is available for plant uptake may have also been affected by its half‐life, which ranges from 12.7 d to 83 d in soil (Table ).…”

Section: Discussionmentioning

confidence: 99%

Evaluating the effects of triclosan on 3 field crops grown in 4 formulations of biosolids

Shahmohamadloo

Lissemore

Prosser

et al. 2017

Enviro Toxic and Chemistry

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A growing body of evidence suggests that amending soil with biosolids can be an integral component of sustainable agriculture. Despite strong evidence supporting its beneficial use in agriculture, there are concerns that chemicals, such as pharmaceuticals and personal care products, could present a risk to terrestrial ecosystems and human health. Triclosan is one of the most commonly detected compounds in biosolids. To date, laboratory studies indicate that triclosan likely poses a de minimis risk to field crops; however, these studies were either conducted under unrealistic exposure conditions or only assessed 1 or 2 formulations of biosolids. The purpose of the present study was to characterize the effects of triclosan on field crops in soils amended with 4 different formulations of biosolids (liquid, dewatered, compost, and alkaline-hydrolyzed), containing both background and spiked triclosan concentrations, following best management practices used in the province of Ontario. Three crop species (corn, soybean, and spring wheat) were evaluated using several plant growth endpoints (e.g., root wet mass, shoot length, shoot wet/dry mass) in 70-d to 90-d potted soil tests. The results indicated no adverse impact of triclosan on any crop-biosolids combination. Conversely, amending soil with biosolids either enhanced or had no negative effect, on the growth of plants. Results of the present study suggest little risk of triclosan to crops in agricultural fields amended with biosolids. Environ Toxicol Chem 2017;36:1896-1908. © 2016 SETAC.

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“…qPCR was conducted using the method described by Liu et al to obtain the absolute abundance of bacterial 16S rRNA. The PCR temperature program was as follows: Pre‐heating at 50 °C for 2 min, pre‐denaturation at 95 °C for 10 min, denaturation at 95 °C for 15 s, annealing at 60 °C for 1 min, and extension at 72 °C for 1 min.…”

Section: Methodsmentioning

confidence: 99%

Influence of Artificial Root Exudates on Triclosan Removal in Soil under Aerobic and Anaerobic Conditions

Liu¹,

Wang²,

Xie³

et al. 2018

CLEAN Soil Air Water

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A batch experiment is conducted to evaluate the influence of root exudates on the removal of triclosan (TCS) in soil samples under aerobic and anaerobic conditions. The BIOLOG method and quantitative real‐time PCR (qPCR) is used to analyze the microbial metabolic characteristics and bacterial absolute abundance, respectively. The results shows that TCS is removed relatively faster in aerobic groups than anaerobic ones, especially in the aerobic group with artificial root exudates solution (ARES) addition. However, no difference can be seen in TCS removal performance between anaerobic groups with or without ARES addition (p > 0.05). The results of BIOLOG show that the average metabolic activity of microorganisms (AWCD) increases significantly in the aerobic group with ARES addition with time, followed by the aerobic control group and anaerobic groups. The carbon source utilization behavior of soil microbes exhibit significant differences. Carbohydrates can be utilized easily in the aerobic group with ARES addition, while the fractional content of amines in the anaerobic group with ARES is highest. Furthermore, bacterial abundance shows positive correlation with the TCS removal under aerobic conditions. Overall, ARES addition can greatly promote the removal efficiency of TCS under aerobic conditions, but have a small effect under anaerobic conditions.

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Triclosan removal in wetlands constructed with different aquatic plants

Cited by 46 publications

References 44 publications

Responses of bacterial community structure and denitrifying bacteria in biofilm to submerged macrophytes and nitrate

Responses of bacterial community structure and denitrifying bacteria in biofilm to submerged macrophytes and nitrate

Evaluating the effects of triclosan on 3 field crops grown in 4 formulations of biosolids

Influence of Artificial Root Exudates on Triclosan Removal in Soil under Aerobic and Anaerobic Conditions

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