Bioaugmentation of Anammox Activated Sludge with a Nitrifying Bacterial Community as a Way to Increase the Nitrogen Removal Efficiency
نویسندگان
چکیده
Abstract — Bioaugmentation, i.e., increasing the abundance of certain microorganisms in community by adding appropriate cells or establishing conditions promoting their growth, is widely used environmental technologies. Its application for launching anammox reactors usually limited to introduction bacteria. We expected addition nitrifiers during bioreactor stimulate process due rapid production nitrite, which bacteria use ammonium oxidation. The present work investigated effect a nitrifying on composition and activity microbial an reactor. At time inoculation laboratory SBR reactor, active (5 days old) (ASB) (bioaugmenting activated sludge, ASB) containing group I nitrifiers, primarily Nitrosospira , was added (1 : 100 biomass) sludge (ASA) stored 1 month at 4°C exhibiting low metabolic activity. ASB resulted increased efficiency nitrogen removal. While noticeable removal control (7%) observed since day 11 incubation, experimental reactor began 4 level 20%. Nitrogen after 30 incubation ~60% experiment 20% control. rate oxidation presence (during first 10 operation) genus Brоcadia were already ASA (throughout all period operation). Activity II (genera Nitrobacter Nitrococcus ), ASB, prevented accumulation high concentrations toxic both High introduced with probably provided one substrates (nitrite), growth. During subsequent operation Nitrosomonas from initial mainly responsible growth Thus, bioaugmentation loading significantly improved via accelerated transition working mode.
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ژورنال
عنوان ژورنال: Microbiology
سال: 2022
ISSN: ['1608-3237', '0026-2617']
DOI: https://doi.org/10.1134/s0026261722020102