Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 829, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.154683
Keywords
Anammox; Leachate; Sulfur autotrophic denitrification; Sulfur-siderite
Categories
Funding
- National Natural Science Foundation of China [51978053]
Ask authors/readers for more resources
This study demonstrates that the addition of siderite stabilizes the reactor system and significantly improves the nitrogen removal process. The sulfur/siderite reactor exhibits higher nitrogen removal efficiency and stronger Anammox activity compared to the sulfur reactor.
High concentrations of nitrate can be generated during anaerobic ammonium oxidation (Anammox) wastewater treatment processes. Addition of sulfur to Anammox reactors stimulates the growth of sulfur-driven denitrifying (SADN) bacteria that can reduce nitrate to nitrogen gas. However, protons released during the SADN process lower the pH of the system and inhibit Anammox activity. 'I'he system will keep stable when pH is in the range of 7.5-8.5. This study showed that addition of siderite stabilized the reactor system and significantly improved the nitrogen removal process. In fact, even when concentrations of total nitrogen were 477.15 +/- 16.84 mg/L, the sulfur/siderite reactor maintained nitrogen removal efficiencies >90%, while efficiencies in the sulfur reactor were < 80%. Anammox accounted for 31% of the bacterial sequences in the sulfur/siderite reactor compared to only 14% in the sulfur reactor with the majority of sequences clustering with Ca. Brocadia. An abundance of c-type cytochromes in anammox aggregates in the sulfur-siderite reactor also indicated that anammox activity was higher in this system.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available