Biological nutrient removal using an alternating of anoxic and anaerobic membrane bioreactor (AAAM) process

Autor: Limei Yuan, Dan-Li Xi, Yi Ding, Chuanyi Zhang, Zhang Yanqiu
Rok vydání: 2008
Předmět:
Zdroj: Desalination. 221:566-575
ISSN: 0011-9164
DOI: 10.1016/j.desal.2007.01.118
Popis: An innovative alternating of anoxic and anaerobic membrane bioreactor (AAAM) process was developed to enhance nitrogen and phosphorus removal simultaneously. The process was composed of a continuous aerated MBR and an alternating anaerobic and anoxic zone containing two separated bioreactors (reactor A and reactor B). By switching on and off the control valves, the mixed liquor in the aerobic zone was recycled to the reactor A or reactor B alternately, thus, the anoxic conditions for denitrification and anaerobic conditions for phosphorus release were implemented in two single tanks alternately. Additionally, by this operation mode, the denitrifying bacteria and phosphate-accumulating organisms (PAOs) could make full use of the organic substrate present in the wastewater alternately. A laboratory-scale experiment treating synthetic wastewater was applied to investigate the performance of the AAAM process. The results showed that COD removal efficiency was high and stable (over 93%) throughout the experiment. Nitrogen and phosphorus removal efficiency also attained high treatment levels (67.4% and 94.1% respectively). Comparing to DO and pH, oxidation–reduction potential (ORP) could provide much better information about the processes going on in reactors A and B during the 120-min cycle. Analysis of membrane fouling showed that small particles seemed to play an important role on the membrane fouling.
Databáze: OpenAIRE
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