The FM-AS process is a two-stage aerobic process consisting of a submerged biological aerated filter packed with fibre media as the first stage and activated sludge as the second stage. A separation unit working on the principle of dissolved-air flotation is needed between the two stages to remove the solids and thereby maintain a suitable sludge age for nitrification in the second stage. The FM-AS process produces effluents with good qualities. The highest removal efficiencies, obtained with a hydraulic retention time of 4.6 hrs. and an operating temperature of 16°C, for BOD5. NH3-N and SS were 95%, 95% and 90% respectively. The economic evaluation suggests that the FM-AS process can be more cost effective than the traditional activated sludge process, particularly when used for upgrading.
A Study of Fibre Media Submerged Biological Aerated Filter-Activated Sludge Process (FM-AS) for Sewage Treatment
Shi. Han-Chang, V. K. Thomas; A Study of Fibre Media Submerged Biological Aerated Filter-Activated Sludge Process (FM-AS) for Sewage Treatment. Water Sci Technol 1 March 1993; 27 (5-6): 413–423. doi: https://doi.org/10.2166/wst.1993.0519
Download citation file:
Impact Factor 1.915
CiteScore 3.3 • Q2
First Decision in 30 days