Bio-Drying of Municipal Wastewater Sludge: Effects of High Temperature, Low Moisture Content and Volatile Compounds on the Microbial Community

This study examined microbiological processes during the bio-drying of municipal wastewater sludge (WS) from waste treatment facilities Moscow region (Russia). In just 21 days bio-drying, moisture content mixture WS and wood chips decreased by 19.7%. It was found that members genus Bacillus were main organic matter destructors. period 7 to 14 days, rates mineralization loss highest, bacteria dominated, accounting for 43.5 84.6% bacterial community with a total number 1.20 (±0.09) × 106 6.70 (±0.44) 105 gene copies µg−1. The maximum Amaricoccus (15.7% community) in middle bio-drying. There an active accumulation nitrate nitrogen due oxidation nitrogen-containing substances same time. Bacteria genera Sphingobacterium, Brevundimonas, Brucella, Achromobacter fungi Fusarium dominated biofilter, which removed volatile compounds air 90%. obtained results allow model further intensification as well its efficiency safety.