Variation in the performance and sludge characteristics of anaerobic ammonium oxidation inhibited by copper

[Display omitted] •The IC50 of Cu(II) on anammox mixed culture was 32.5mgL−1 in short-term testing.•Anammox sludge exposed to 5–10mgL−1 Cu(II) displayed severe cumulative inhibition.•Anammox could resist 5mgL−1 Cu(II) but was severely inhibited by 8mgL−1 Cu(II).•Anammox performance can recover from...

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Published in:Separation and purification technology 2015-03, Vol.142, p.108-115
Main Authors: Zhang, Qian-Qian, Zhang, Zheng-Zhe, Guo, Qiong, Chen, Qian-Qian, Jin, Ren-Cun, Jia, Xiu-Ying
Format: Article
Language:English
Subjects:
Anammox
Buffers
Copper
Inhibition
Mathematical models
Nitrogen removal
Oxidation
Recovery
Sludge
Sludge characteristics
Toxicity
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Summary:[Display omitted] •The IC50 of Cu(II) on anammox mixed culture was 32.5mgL−1 in short-term testing.•Anammox sludge exposed to 5–10mgL−1 Cu(II) displayed severe cumulative inhibition.•Anammox could resist 5mgL−1 Cu(II) but was severely inhibited by 8mgL−1 Cu(II).•Anammox performance can recover from Cu(II) stress after long-term operation. This study investigated the short-term inhibitory effects of Cu(II) on anaerobic ammonium oxidation (anammox) performance and sludge characteristics. The short-term inhibition, kinetic characteristics, and cumulative inhibition of Cu(II) on anammox sludge and recovery from this inhibited activity by washing with buffered solution were investigated by batch testing. The results showed that the half inhibition concentration (IC50) was 32.5mgL−1 and that inhibition by Cu(II) on anammox was non-competitive. The cumulative toxicity of Cu(II) was severe. After the biomass was washed with buffered solution for 10h, the suppression of anammox activity by 5mgL−1 Cu(II) could be remitted, whereas no more than 73.0% of the pre-inhibited level of activity was regained at higher Cu(II) concentrations (over 15mgL−1). Additionally, 8mgL−1 Cu(II) inhibited anammox performance considerably during continuous operation, with the nitrogen removal rate (NRR) decreasing from 12.4 to nearly 0kgm−3d−1. In contrast, the anammox consortia could tolerate Cu(II) stress after domestication with a low level of Cu(II) (5mgL−1). The performance of recovery similar to the re-startup features were simulated by a modified Boltzmann model.
ISSN:1383-5866
1873-3794
DOI:10.1016/j.seppur.2014.11.048