Role of air scouring in anaerobic/anoxic tanks providing nitrogen removal by mainstream anammox conversion in a hybrid biofilm/suspended growth full‐scale WWTP in China
| Autor: | Liang Qian, Mark C.M. van Loosdrecht, George Wells, Hulin Cai, Helen X. Littleton, Glen T. Daigger, Quan Yuan, Kaijun Wang, Beiping He |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Bioaugmentation
Denitrification Nitrogen chemistry.chemical_element 02 engineering and technology Wastewater 010501 environmental sciences 01 natural sciences Bioreactors 020401 chemical engineering Ammonium Compounds Environmental Chemistry Anaerobiosis 0204 chemical engineering Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology Sewage Ecological Modeling Chemical oxygen demand Pulp and paper industry Pollution Anoxic waters chemistry Anammox Biofilms Environmental science Sewage treatment Oxidation-Reduction Anaerobic exercise |
| Zdroj: | Water Environment Research. 93:2198-2209 |
| ISSN: | 1554-7531 1061-4303 |
| DOI: | 10.1002/wer.1592 |
| Popis: | A full-scale wastewater treatment plant in China experienced unintentional anammox bacterial enrichment on biofilm carriers placed in the anaerobic and anoxic zones of an anaerobic/anoxic/oxic process under ambient temperatures and without bioaugmentation. Here, we show that microaerophilic conditions resulting from air scouring needed for biofilm carrier suspension in the anaerobic/anoxic zones can support a robust nitritation/anammox process. Results from an in situ on/off air scouring test showed that air scouring strongly induced both ammonia and total inorganic nitrogen removal in the anaerobic/anoxic zones. Ammonium concentration in the anaerobic and anoxic tanks remained constant or even slightly increased when air scouring was off, indicating that air scouring made a noticeable difference in nitrogen profiles in the anaerobic/anoxic zones. Various batch tests further indicated that partial denitrification is not likely to generate nitrite for anammox bacteria. Robust nitritation, and anammox on the carriers, can occur at low dissolved oxygen conditions, as measured in the full-scale facility. The observations show that mainstream deammonification without sidestream bioaugmentation at moderate temperature is feasible and further optimization by a more dedicated design can result in improved nitrogen removal in cases when chemical oxygen demand is limited in mainstream wastewater treatment. PRACTITIONER POINTS: Microaerophilic conditions in a full-scale IFAS reactor caused mainstream anammox in moderate temperate area. Robust nitritation, and anammox on the carriers, can occur at low dissolved oxygen conditions in anaerobic/anoxic tanks with air scouring. Anammox can function well with conventional nitrification and denitrification process at mainstream conditions for stable nitrogen removal. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text