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4494618 
Journal Article 
Wastewater treatment using a modified A2O process based on fiber polypropylene media 
Lai, TM; Dang, HV; Nguyen, D; Yim, S; Hur, Jin 
2011 
Yes 
Journal of Environmental Science and Health, Part A: Environmental Science and Engineering & Toxic and Hazardous Substance Control
ISSN: 1077-1204 
Taylor & Francis Ltd. 
46 
10 (2011) 
1068 
English 
21762009 
WOS:000294701200004 
The removal rates of organics and nutrients in municipal wastewater were examined using a laboratory-scale Anaerobic/Anoxic/Oxic (A2O) process modified with fiber polypropylene media at different operational conditions. The system demonstrated excellent performance with the removal rates of chemical oxygen demand (COD), total nitrogen (TN) and total phosphorous (TP) ranging from 91% to 98%, from 48% to 63%, and from 56% to 71%, respectively. Our system was superior to those previously reported based on more complex biofilm reactors, particularly from an economic point of view. For our system, a considerable reduction of COD (55%-68%) occurred even in the anaerobic reactor. The removal rates of COD and nutrients exhibited a slight decreasing trend with a higher organic loading rate (OLR) (0.5 to 2.2 kg COD m... day...) or with a shorter hydraulic retention time (HRT). The results may be attributed to the competition between nitrifying and heterotrophic bacteria and/or the insufficient time for biological uptake. It is expected that applying fiber polypropylene media to a conventional A2O process may significantly enhance the treatment efficacy of organics and nutrients as a cost-effective strategy. (ProQuest: ... denotes formulae/symbols omitted.) 
Nutrient removal; Water treatment; Polypropylene