Response of wastewater treatment performance, microbial composition and functional genes to different C/N ratios and carrier types in MBBR inoculated with heterotrophic nitrification-aerobic denitrification bacteria.
To operate the moving bed biofilm reactor inoculated with HN-AD bacteria (B-MBBR) instead of activated sludge for livestock and poultry breeding wastewater (LPBW) disposal in most efficient manner, nitrogen removal (NR) efficiency and microbial composition of two MBBRs with different carrier types under various C/N ratios were explored. Results indicated that the performance on NR greatly various in different carrier types under various C/N ratios. Attributing to the bacterial protection provided by the porous structure of polyvinyl alcohol (PVA) gel, MBBR using PVA gel as the carrier exhibited a more stable NR performance (range from 78.05% to 83.76%) versus that using Kaldnes (K1) as the carrier (range from 78.05% to 83.76%). Besides, microbial analysis indicated that MBBR with PVA gel as the carrier is conducive to the growth of oligotrophic and HN-AD bacteria (Paracoccus and Acinetobacter), and the highest relative abundance was 16.37% at C/N ratio of 6.
['Chen|Xue|X|', 'Zhang|Qian|Q|', 'Zhu|Yunan|Y|', 'Zhao|Tiantao|T|']
D001419:Bacteria D018441:Biofilms D019149:Bioreactors D058440:Denitrification D058465:Nitrification D009584:Nitrogen D014865:Waste Disposal, Fluid D062065:Waste Water D018508:Water Purification
Microbial composition C/N ratio Carrier type HN-AD bacteria Nitrogen transforming pathway