Pairing denitrifying phosphorus accumulating organisms with anaerobic ammonium oxidizing bacteria for simultaneous N and P removal
| Autor: | Mari-Karoliina H. Winkler, Kim Tran, David A. Stahl, Ting Xie, Jun Yin, Kristopher A. Hunt, Bao Nguyen Quoc |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
010504 meteorology & atmospheric sciences Nitrogen Biomass 010501 environmental sciences 01 natural sciences Bacteria Anaerobic Denitrifying bacteria chemistry.chemical_compound Bioreactors Ammonium Compounds Environmental Chemistry Ammonium Anaerobiosis Nitrite Waste Management and Disposal 0105 earth and related environmental sciences Sewage biology Biofilm Phosphorus biology.organism_classification Pollution Polyphosphate-accumulating organisms chemistry Anammox Environmental chemistry Denitrification Oxidation-Reduction Bacteria |
| Zdroj: | Science of The Total Environment. 787:147521 |
| ISSN: | 0048-9697 |
| DOI: | 10.1016/j.scitotenv.2021.147521 |
| Popis: | Coupling of denitrifying polyphosphate accumulating organisms (DPAO) with anaerobic ammonium oxidizing (Anammox) bacteria in a single treatment scheme has so far been unsuccessful but could offer substantial energy savings, minimize sludge production, while achieving simultaneous carbon, nitrogen and phosphate removal. However, both organisms compete for nitrite and have vastly different growth rates and therefore the goal of this study was to uncouple their solid retention time (SRT) by growing them in different sludge fractions and to determine their biomass specific kinetic properties. Anammox bacteria were grown in a biofilm for longer SRTs and DPAO in flocs to allow shorter SRTs. Exposure of DPAO to anaerobic conditions was accomplished by recycling the flocs to a separate reactor by which simultaneous P, N, and C removal was accomplished. The diffusion limited biofilm lowered the biomass specific nitrite affinity for Anammox (KsAMX = 0.091 mM), which gave DPAO a competitive edge to consume nitrite (KsDPAO = 0.022 mM) in the suspended floc fraction. However, DPAO are more sensitive to nitrite (KiDPAO = 0.377 mM) than Anammox bacteria and (KiAMX > 1.786 mM), and therefore the DPAO would be better suited to grow in the protective biofilm, showing that both biomass growth types (flocs and granules) have advantages (and disadvantages) depending on the setting. This work is an important steppingstone to understanding resource competition amongst Anammox and DPAO and SRT management strategies to allow their pairing in combined reactor configurations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect