The fate of tetracycline in vegetated mesocosmic wetlands and its impact on the water quality and epiphytic microbes

The impacts of cadmium exposure on epiphytic bacterial communities and water quality in mesocosmic wetlands.

“…The decline in microbial aggregates on submerged plants with increased Cd concentration may be attributed to the Cd toxicity and allelopathic effect (natural plants) on bacteria growth and colonization (He et al, 2021;Huang et al, 2020). Additionally, bacterial and algal cells were mostly encapsulated in an EPS structure that has been densely produced on arti cial plants (AP) and P. maackianus (P) with 0.5mg/L Cd concentration, consistent with prior reports (Chen et al, 2023;Ohore et al, 2021b). The presence of more epiphytic microbes on arti cial plants than on V. natans may be due to the arti cial plants' inability to discharge allelochemicals, which impede microbes on the plastic surface.…”

“…The increase of DO may possibly due to the oxygen release by submersed plant photosynthesis (Pedersen et al, 2013). The spike in EC values may be due to nutrient retention in the water column (Ohore et al, 2021b). The high Cd concentration can exert a deleterious impact on the submerged plant-epiphytic bio lm systems, which are involved in the sequestration of ions from the surrounding water column.…”

A Literature Review of Wetland Treatment Systems Used to Treat Runoff Mixtures Containing Antibiotics and Pesticides from Urban and Agricultural Landscapes

“…Only one study in 2020 considered a runoff mixture containing antibiotics, nutrients, pesticides, and other pharmaceuticals [103]. Of these studies that looked at mixtures, only 16 specifically analyzed the impact on nitrogen removal in the presence of different contaminants [23,30,58,59,67,97,102,103,[112][113][114]120,131,169,179,181,201]. Thus, the data shows that only recently have some of these contaminants started to be studied individually, in the case of antibiotics, but also as mixtures.…”

“…Several primary studies reported the impact of CUPs' and antibiotics' presence on nitrogen removal efficiencies. Of these, seven studies reported that the specific contaminant analyzed decreased nitrogen removal [30,58,67,113,114,169]. The impact of CUPS and antibiotics on nutrient removal was mainly attributed to a decline in the microbial communities responsible for nutrient metabolism and degradation [30,114,131,169], where the presence of plants and type of plant species [23,102,120,201], saturated vs. unsaturated conditions [120,201], weather conditions [201], and timing [48,169] also played a role in N removal in the presence of CUPS or antibiotics.…”

“…Of these, seven studies reported that the specific contaminant analyzed decreased nitrogen removal [30,58,67,113,114,169]. The impact of CUPS and antibiotics on nutrient removal was mainly attributed to a decline in the microbial communities responsible for nutrient metabolism and degradation [30,114,131,169], where the presence of plants and type of plant species [23,102,120,201], saturated vs. unsaturated conditions [120,201], weather conditions [201], and timing [48,169] also played a role in N removal in the presence of CUPS or antibiotics. reported that the presence of tetracycline decreased nitrogen removal initially, but observed an increase in total N removal with an increasing number of days due to the degradation of antibiotics in the wetland system [169].…”