Fe-modified biochar enhances microbial nitrogen removal capability of constructed wetland

Removal of abamectin and conventional pollutants in vertical flow constructed wetlands with Fe-modified biochar

“…The biochar modied by FeNO 3 has a more positive charge, which could have increased its ability to adsorb NO 3 À -N and facilitate bacterial adhesion. 4,42 Even if the adsorption capacity of biochar is exhausted, the biolm formed on the biochar will continue to remove organic matter. 42 SEM shows the surface morphology of Fe-modied biochar in Fig.…”

“…2,3 The strong ability and persistence of personal-care products (PPCPs, such as antibiotics and sex hormones) and pesticides in the environment have become increasingly prominent. 4,5 Because of the low concentration of EOCs in the water (mg L À1 or ng L À1 ), most water treatment facilities cannot effectively eliminate them. 6 EOCs and PPCPs and other emerging pollutants have also become new international research hotspots.…”

“…27,28 In addition, modied biochar has more activation sites, which increase the electrostatic adsorption of NO 3 -N and enhance its denitrication ability. 4,29 Iron is an abundant redox-active metal in the earth. 30 In recent years, researchers have discovered that bacteria play an important role in the anaerobic oxidation of Fe(II) and can oxidize it to Fe(III) in an oxygen-decient environment.…”

Vertical flow constructed wetlands using expanded clay and biochar for wastewater remediation: A comparative study and prediction of effluents using machine learning

“…L -1 ) (Joseph et al, 2020). The system of Fe-biochar -CW illustrated the superiority than normal CW in pollution removal (NH 4 -N 86.33%, and COD 63.36%) and abundances of genes involved in nitrogen removal (Jia et al, 2020). Besides, flow regime in CW is another important factor affecting CW systems such as recirculation (Decezaro et al, 2019, Prost-Boucle and Molle, 2012, Torrijos et al, 2016, J o u r n a l P r e -p r o o f two-stage system (Kim et al, 2014, Nguyen et al, 2018, Saeed et al, 2019 and stepfeeding operation (Patil andChakraborty, 2017, Wang et al, 2020).…”

“…Recently, much interests have been drawn for biochar, which outperform conventional filter layers as they could spur plant growth, improve soil quality, and adsorb pollutants from water (Kasak et al, 2018), leachate (Joseph et al, 2020), secondary wastewater effluent (Odedishemi Ajibade et al, 2021), and domestic wastewater (Jia et al, 2020). Besides CW packed biochar demonstrated the high reduction of nitrate (78%), phosphate (70%), and COD (65%), it also supported the removal of contaminants and odor from intensified leachate (COD 4000 -14000 mg .…”