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Insight into the mechanisms of biochar addition on pollutant removal enhancement and nitrous oxide emission reduction in subsurface flow constructed wetlands: Microbial community structure, functional genes and enzyme activity
- Source :
- Bioresource technology. 307
- Publication Year :
- 2020
-
Abstract
- A set of constructed wetlands (CWs) under different biochar addition ratios (0%, 10%, 20%, and 30%) was established to analyze the pollutant removal performance enhancement and nitrous oxide (N2O) emission reduction from various angles, including microbial community structure, functional genes and enzyme activity. Results revealed that the average removal efficiencies of ammonium (NH4+-N) and total nitrogen (TN) were improved by 2.6%-5.2% and 2.5%-7.0%. Meanwhile, N2O emissions were reduced by 56.0%-67.5% after biochar addition. Increased nitrogen removal efficiency and decreased N2O emissions resulted from the increase of biochar addition ratio. Biochar addition changed the microbial community diversity and similarity. The relative abundance of functional microorganisms such as Nitrosomonas, Nitrospira, Thauera and Pseudomonas, increased due to biochar addition, which promoted the nitrogen cycle and N2O emission reduction. High gene copy number and enzyme activity involved in nitrification and denitrification process were obtained in biochar CWs, moderating N2O emission.
- Subjects :
- 0106 biological sciences
Environmental Engineering
Nitrogen
Nitrous Oxide
Bioengineering
010501 environmental sciences
01 natural sciences
chemistry.chemical_compound
010608 biotechnology
Biochar
Ammonium
Waste Management and Disposal
Nitrogen cycle
Nitrosomonas
0105 earth and related environmental sciences
Pollutant
biology
Renewable Energy, Sustainability and the Environment
Microbiota
General Medicine
Nitrous oxide
equipment and supplies
biology.organism_classification
chemistry
Microbial population biology
Environmental chemistry
Charcoal
Wetlands
Denitrification
Environmental Pollutants
Nitrospira
Subjects
Details
- ISSN :
- 18732976
- Volume :
- 307
- Database :
- OpenAIRE
- Journal :
- Bioresource technology
- Accession number :
- edsair.doi.dedup.....74aa3074f5f2444a862e6612f99c6152