Journal
BIORESOURCE TECHNOLOGY
Volume 329, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.124903
Keywords
Nitrogen metabolism; Sludge reduction; Metagenomic sequencing; Nitrospira; Dissimilatory nitrate reduction
Funding
- National Natural Science Foundation of China [51878403]
- Shuguang Plan of Shanghai [19SG49]
- Science and Technology Commission of Shanghai Municipality of China [19DZ1204904]
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This study investigated the effects of hydraulic retention time of anaerobic side-stream reactors on nitrogen removal in four anoxic/oxic membrane bioreactors. The results showed that upgrading with anaerobic side-stream reactors and carriers can enhance nitrogen removal efficiency by increasing denitrifying bacteria and secondary substrate release. Additionally, metagenomic analysis revealed higher abundances of genes related to nitrogen consumption processes in the upgraded reactors, confirming their pivotal roles in nitrogen metabolism.
Synchronous sludge reduction and nitrogen removal have attracted increasing attention, while the underlying mechanisms of diverse nitrogen metabolism within the complicated processes remain unclear. Four anoxic/oxic membrane bioreactors, three of which were upgraded by anaerobic side-stream reactors (ASSR) and carriers (APSSR-MBRs), were operated to determine effects of hydraulic retention time of ASSRs. APSSR-MBRs achieved more significant nitrogen removal and higher nitrate uptake rate because of more denitrifying bacteria and the supernumerary release of secondary substrates. Ammonia uptake rate showed the diverse Nitrospira preceded over anaerobic decay and sulfide inhibition in the ASSR, and made the reactor exhibit higher nitrification capacity. Metagenomic analysis indicated that APSSR-MBRs showed higher abundances of genes related to nitrogen consumption processes, and higher abundances on the carriers, confirming their pivotal roles in nitrogen metabolism. This study provided novel perspectives to build a bridge between process model and nitrogen metabolism in the sludge reduction system..
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