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- Title
Innovative inbuilt moving bed biofilm reactor for nitrogen removal applied in household aquarium.
- Authors
Xiaolin Zhou; Haicheng Liu; Xing Fan; Xinhao Xu; Yuan Gao; Xuejun Bi; Lihua Cheng; Shujuan Huang; Fangchao Zhao; Tang Yang
- Abstract
An innovative inbuilt moving bed biofilm reactor (MBBR) was created to protect fish from nitrogen in a household aquarium. During the 90 experimental days, the ammonia nitrogen (NH4 +-N) concentration in the aquarium with the inbuilt MBBR was always below 0.5mg/L, which would not threaten the fish. Concurrently, nitrite and nitrate nitrogen concentrations were always below 0.05mg/L and 4.5mg/L, respectively. However, the blank contrast aquarium accumulated 1.985mg/L NH4 +-N on the 16th day, which caused the fish to die. The suspended biofilms could achieve the specific NH4 +-N removal rate of 45.43g/m³/d. Biofilms presented sparsely with filamentous structures and showed certain degrees of roughness. The bacterial communities of the suspended biofilms and the sediment were statistically different (p <0.05), reflected in denitrifying and nitrifying bacteria. In particular, the relative abundance of Nitrospira reached 1.4%, while the genus was barely found in sediments. The suspended biofilms showed potentials for nitrification function with the predicted sequence numbers of ammonia monooxygenase [1.14.99.39] and hydroxylamine dehydrogenase [EC:1.7.2.6] of 220 and 221, while the values of the sediment were only 5 and 1. This study created an efficient NH4 +-N removal inbuilt MBBR for household aquariums and explored its mechanism to afford a basis for its utilization.
- Subjects
MOVING bed reactors; BIOFILMS; AQUARIUMS; NITRIFYING bacteria; SUSPENDED sediments; DENITRIFYING bacteria; PEBBLE bed reactors
- Publication
Frontiers in Microbiology, 2024, p01
- ISSN
1664-302X
- Publication type
Article
- DOI
10.3389/fmicb.2024.1373119