Enhanced Degradation of Nitrosamines from Water Using Zero-Valent Iron-Assisted Biological Activated Carbon
- 1 October 2021
- journal article
- research article
- Published by American Society of Civil Engineers (ASCE) in Journal of Environmental Engineering
- Vol. 147 (10), 04021038
- https://doi.org/10.1061/(asce)ee.1943-7870.0001892
Abstract
Nitrosamines have become a focus of considerable research because of their carcinogenicity and environmental universality. In this study, to effectively remove nitrosamines, biological activated carbon (BAC) was acclimatized by a nitrosamine-reducing bacterial strain, and zero-valent iron ( )-assisted BAC was used to degrade nitrosamines from aqueous solution. The influencing factors and degradation mechanism were investigated. Compared with activated carbon (AC), the removal efficiency of more strongly polar nitrosamines by BAC and increased prominently (21.0%–32.3%), yet there was no change between BAC and . The highest ratios of nitrosamine degradation by were 49.8%–99.0%, and degradation reaction kinetics conformed best to a pseudo-second-order model ( ). The rate constants for six nitrosamines ranged from to 6.9 × 105 (M · s)−1. Additionally, the removal ratios and of the linear nitrosamines partially scaled with their molecular weight, , and ( ). All nitrosamines were degraded within under strong acidic conditions; the removal ratios increased by 11.2%−23.1% under anaerobic conditions, but were decreased by in the presence of humic acid. The primary degradation products were secondary amines, methylamine, formic acid, nitrate, and nitrite resulting from the reduction of and biodegradation by the nitrosamine-reducing bacteria.
Keywords
This publication has 59 references indexed in Scilit:
- Effective treatment of greywater via green wall biofiltration and electrochemical disinfectionWater Research, 2020
- Modeling of fenuron pesticide adsorption on CNTs for mechanistic insight and removal in waterEnvironmental Research, 2018
- Facile and eco-friendly synthesis of functionalized iron nanoparticles for cyanazine removal in waterColloids and Surfaces B: Biointerfaces, 2018
- New generation nano-adsorbents for the removal of emerging contaminants in waterJournal of Molecular Liquids, 2018
- Chemical chiral pollution: Impact on the society and science and need of the regulations in the 21st centuryChirality, 2017
- Progress in the biological and chemical treatment technologies for emerging contaminant removal from wastewater: A critical reviewJournal of Hazardous Materials, 2017
- Occurrence of nitrosamines and their precursors in drinking water systems around mainland ChinaWater Research, 2016
- Applications of biofiltration in drinking water treatment – a reviewJournal of Chemical Technology & Biotechnology, 2015
- Differential Microbial Transformation of Nitrosamines by an Inducible Propane MonooxygenaseEnvironmental Science & Technology, 2013
- Kinetics and Structural Constraints of Chromate Reduction by Green RustsEnvironmental Science & Technology, 2003