Microbial community dynamics in an ANAMMOX reactor for piggery wastewater treatment with startup, raising nitrogen load, and stable performance.

ABSTRACT: Bacterial community dynamics of the ANAMMOX reactor of an integrated "UASB?+?SHARON?+?ANAMMOX" system for treating piggery wastewater were investigated using the Illumina MiSeq method with samples obtained at ~?2-week intervals during a 314-day period. With aerobic activated sludge as seeds and low content artificial wastewater (NH4+-N 50 mg/L; NO2--N 55 mg/L) as influent for the ANAMMOX reactor, nitrogen removal was initially observed on day 38 with a removal rate 1.3 mg N L-1 day-1, and increased to 90.4 mg N L-1 day-1 on day 55 with almost complete removal of ammonia and nitrite, indicating a successful startup of the reactor. Increasing influent load stepwise to NH4+-N 272.7 mg/L/NO2--N 300 mg/L, nitrogen removal rate increased gradually to 470 mg N L-1 day-1 on day 228, and maintained a stable level (~?420 mg N L-1 day-1) following introduction of SHARON effluent since day 229. Correlation between microbial community dynamics and nitrogen removal capability was significant (r?=?0.489, p??300 mg/L), suggesting their different niches and application for different loads. These findings improve the understanding of relationships among microbial community/functional taxa, running parameters and reactor performance, and will be useful in optimizing running parameters for rapid startup and high, stable efficiency.

SUBMITTER: Huang Q 

PROVIDER: S-EPMC6167272 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature