Abstract：
:Biochar is widely used in water treatment because of its porous structure, however, the effects of biochars on denitrification remain unclear. Here, we combined molecular biological and electrochemical techniques to investigate effects of biochars (formed at 300 °C, 500 °C and 800 °C) on denitrification. Results showed that biochar at 300 °C increased total nitrogen removal by 415% and decreased N2O accumulation by 78%. Mechanistic research demonstrated that it achieved the highest electron transfer efficiency and denitrifying enzyme activities. Further study evidenced that biochar at 300 °C increased the abundance of denitrifiers such as Pseudomonas. Correlation analysis indicated that nitrate reductase and nitrite reductase activities were the key factors influenced by biochar during denitrification. Overall, this study suggested that biochar at 300 °C could act as the bio-engineer of electron shuttle and the stimulator of denitrification, achieving high rate nitrogen removal and significant reduction of N2O accumulation from high-strength wastewater.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Wu Z,Xu F,Yang C,Su X,Guo F,Xu Q,Peng G,He Q,Chen Ydoi
10.1016/j.biortech.2018.12.058subject
Has Abstractpub_date
2019-03-01 00:00:00pages
297-306eissn
0960-8524issn
1873-2976pii
S0960-8524(18)31719-Xjournal_volume
275pub_type
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