Back to Search
Start Over
Robustness of mainstream anammox activity at bench and pilot scale
- Source :
- Science of The Total Environment, 796
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- New technologies and processes, such as mainstream anammox, aim to reduce energy requirements of wastewater treatment and improve effluent quality. However, in municipal wastewater (MWW) anammox system are often unstable due to process control disturbance, influent variability, or unwanted nitrite oxidizing bacteria (NOB). This study examines the anammox system by focusing on anammox activity and its robustness in a mainstream environment. An 8 m3 pilot-scale sequencing batch reactor (SBR) receiving pretreated MWW (with external nitrite addition) was seeded with pre-colonized carriers. Within six months at 12–20 °C an anammox activity of 200 gN·m−3·d−1 was achieved. After the startup an anammox activity of 260 ± 83 gN·m−3·d−1 was maintained over 450 days. The robustness of the anammox activity was analyzed through three disturbance experiments. Anammox biofilm on carriers were exposed to dissolved oxygen (DO = 1.6 mg·L−1, intermittent aeration), organic loading rate (OLR, C/N increased from 2:1 to 5:1) and temperature disturbances (20 °C to 12 °C) in triplicate 12 L bench scale reactors. The anammox activity and microbial community was monitored during these disturbances. The DO and OLR disturbance experiments were replicated at pilot scale to investigate upscaling effects. Bench and pilot scale anammox activity were unaffected by the DO disturbance. Similarly, an increase in OLR did not deteriorate the bench and pilot scale anammox activity, if nitrate was available. When, at bench scale, the reactor temperature was reduced from 20 °C to 12 °C overnight, anammox activity decreased significantly, this was not the case for the slow seasonal temperature changes (12–25 °C) at pilot scale where no strong temperature dependency was detected in winter. Metagenomic analysis revealed a broad range of Brocadiaceae species with no single dominant anammox species. Anammox thrive under mainstream conditions and can withstand typical process disruptions.<br />Science of The Total Environment, 796<br />ISSN:0048-9697<br />ISSN:1879-1026
- Subjects :
- Environmental Engineering
Nitrogen
Sequencing batch reactor
Wastewater
Water Purification
chemistry.chemical_compound
Bioreactors
Nitrate
Anammox activity
Ammonium Compounds
Environmental Chemistry
Anaerobiosis
Nitrite
Mainstream anammox
Robustness
Waste Management and Disposal
Effluent
Nitrites
Pilot
Disturbance
Pulp and paper industry
Pollution
chemistry
Anammox
Environmental science
Sewage treatment
Aeration
Oxidation-Reduction
Subjects
Details
- ISSN :
- 00489697 and 18791026
- Volume :
- 796
- Database :
- OpenAIRE
- Journal :
- Science of The Total Environment
- Accession number :
- edsair.doi.dedup.....79d35c6c5f06fc9d60130c6bbe901a72