Transformation of carbon dots by ultraviolet irradiation, ozonation, and chlorination processes: Kinetics and mechanisms

2022 ◽  
Author(s):  
Mengyao Shen ◽  
Jingyi Wu ◽  
Yuzheng He ◽  
Guoguang Liu ◽  
Yiping Feng
Keyword(s):  
Wastewater Treatment ◽  
Ultraviolet Irradiation ◽  
Carbon Dots ◽  
Wastewater Treatment Plants ◽  
Luminescent Properties ◽  
Carbon Nanomaterial ◽  
Water And Wastewater Treatment ◽  
Water And Wastewater

As a new carbon nanomaterial, carbon dots (CDs) with unique physicochemical and luminescent properties have wide-ranging applications. Once released into the water and wastewater treatment plants, CDs will undergo physicochemical...

scholarly journals Removal Effectiveness of Nanoplastics (<400 nm) with Separation Processes Used for Water and Wastewater Treatment

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 635 ◽  
Author(s):  
Audrey Murray ◽  
Banu Örmeci
Keyword(s):  
Wastewater Treatment ◽  
Surface Waters ◽  
Wastewater Treatment Plants ◽  
General Idea ◽  
Stormwater Treatment ◽  
Water And Wastewater Treatment ◽  
Separation Processes ◽  
Bench Scale ◽  
Scale Unit ◽  
Water And Wastewater

Microplastics and nanoplastics are abundant in the environment, and the fate and impact of nanoplastics are of particular interest because of their small size. Wastewater treatment plants are a sink for nanoplastics, and large quantities of nanoplastics are discharged into surface waters through wastewater as well as stormwater effluents. There is a need to understand the fate and removal of nanoplastics during water, wastewater, and stormwater treatment, and this study investigated their removal on a bench-scale using synthesized nanoplastics (<400 nm) to allow controlled experiments. Plastic particles were created in the lab to control their size, and bench-scale dewatering devices were tested for their ability to remove these particles. Filtration with a 0.22 μm filter removed 92 ± 3% of the particles, centrifugation at 10,000 rpm (670,800 g) for 10 min removed 99 ± 1% of the particles, and ballasted flocculation removed 88 ± 3%. These results provide a general idea of the magnitude of the removal of nanoplastics with separation processes, and more work is recommended to determine the degree of removal with full-scale unit processes. Even though the removal was good using all three treatments, smaller particles escaping treatment may increase the nanoplastics concentration of receiving water bodies and impact aquatic ecosystems.

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