Evaluation of the key factors to dominate aerobic ammonia-oxidizing archaea in wastewater treatment plant

Rice biological nitrification inhibition efficiency depends on plant genotype exudation rate

“…Stronger inhibition of AOA than AOB in culture bioassay but not in the rhizosphere Similarly to numerous rice acidic paddy soils (Chen et al, 2008;Ke et al, 2013;Hu et al, 2015), AOA were the more abundant nitrifiers in our study. The greater adaptation of AOA than AOB to thrive under low pH, lower ammonium availability and low oxygen concentration environments are likely the key factors influencing their dominance under hypoxic environments (Kraft et al, 2022;Xie et al, 2021;Martens-Habbena et al, 2009). AOA dominance does not preclude AOB in this type of soils (Chen et al, 2011;Ke et al, 2013;Huang et al, 2014;Zhang et al, 2019;Fu et al, 2020).…”

How to Provide Nitrite Robustly for Anaerobic Ammonium Oxidation in Mainstream Nitrogen Removal

“…So far, AOA have been discovered in diverse environments, and can be classified into five main clusters based on phylogeny of the ammonia monooxygenase subunit A ( amoA ) . In WWTPs, most AOA are affiliated with Group I.1b cluster, while their relevance to wastewater treatment systems is controversial, because the gene encoding for amoA has shown a high variability in the relative abundance. , AOA have higher ammonia and oxygen affinity ( K m,NH3 = 0.003–1.01 μmol/L, K m,O2 = 2.13–3.47 μmol/L) than that of AOB ( K m,NH3 = 0.01–33.3 μmol/L, K m,O2 = 0.10–30.3 μmol/L) (Table ). , Specifically, AOA possess a wide range of ammonia affinities, endowing them a flexible lifestyle in both ammonium-limited (0.1–1.0 mg/L) and high ammonium (20–500 mg/L) environments. , Also, AOA are capable of outcompeting AOB at DO ≤ 1.5 mg/L, , as well as surviving and coexisting with AnAOB under hypoxic conditions (DO < 0.1 mg/L), , which makes them more likely to provide nitrite for AnAOB than AOB at a low DO circumstance.…”

“…So far, AOA have been discovered in diverse environments, 139 and can be classified into five main clusters based on phylogeny of the ammonia monooxygenase subunit A (amoA). 127 In WWTPs, most AOA are affiliated with Group I.1b cluster, 140 while their relevance to wastewater treatment systems is controversial, because the gene encoding for amoA has shown a high variability in the relative abundance. 125,141 AOA have higher ammonia and oxygen affinity (K m,NH3 = 0.003−1.01 μmol/L, K m,O2 = 2.13− 3.47 μmol/L) than that of AOB (K m,NH3 = 0.01−33.3 μmol/L, K m,O2 = 0.10−30.3 μmol/L) (Table 1).…”

“…143 Other environmental and physiological factors, including temperature (5−30 °C), pH (6.0−9.0, with optimal of 7.5), salinity (1.0−3.5%), and copper (3.3−76.9 μg/L), also affect the niche differentiation and habitat selection of AOA in WWTPs. 123,125,140 Especially, AOA showed a more important role and a higher relative abundance (up to 446 times) than AOB in nitrification in WWTPs in winter and cold regions (5− 22 °C), 132 exhibiting its potential in nitrite supply under low temperature.…”