Granulation characteristics of anammox sludge in response to different signal-molecule-stimulants; mediated through programmed cell death.

Autor: Yang Z; School of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, PR China., Wang X; Laboratory of Water Pollution Remediation, School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 311121, PR China., Yu D; School of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, PR China., Chen G; School of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, PR China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao, 266071, PR China. Electronic address: cghui@qdu.edu.cn., Ma K; Qingdao Licun River Sewage Treatment Plant, Qingdao, 266000, PR China., Zhang P; School of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, PR China., Xu Y; School of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, PR China.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2024 Apr; Vol. 354, pp. 141497. Date of Electronic Publication: 2024 Mar 05.
DOI: 10.1016/j.chemosphere.2024.141497
Abstrakt: During the anammox process, mitigation of biomass washout to increase sludge retention is an important parameter of process efficiency. Signal molecular stimulants (SMS) initiate the sludge granulations controlled by programmed cell death (PCD) of microorganisms. In this study, the aerobic granular sludge (AGS), cell fragments, extracellular polymeric substances (EPS), and AGS process effluent were tested as SMS to identify their effect on anammox granulation. The results showed that the addition of SMS increased the nitrogen removal efficiency to varying degrees, whereas the addition of AGS process supernatant, as SMS, increased the ammonia removal efficiency up to 96%. The addition of SMS was also found to increase EPS production and contributed to sludge granulation. In this process, the proportion of PCD increased and both Gaiella and Denitratisoma abundance increased from 3.54% to 5.59%, and from 1.8% to 3.42%, respectively. In conclusion, PCD was found important to increase anaerobic ammonia oxidation performance through the granulation mechanism.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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