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  • Title: [Nitrogen Removal of Double-bacteria-layer System via PN/A Process].
    Author: Xu JY, Du J, Yang YF, Lü F, Xia SQ.
    Journal: Huan Jing Ke Xue; 2018 Aug 08; 39(8):3767-3774. PubMed ID: 29998685.
    Abstract:
    Nitrification and anaerobic ammonia oxidation (ANAMMOX) sludge was acclimated via SBR and MBR reactors respectively, both of which were embedded with microbial immobilization technology and spliced together to construct a PN/A double-bacteria-layer system. A short-term experiment proved that ammonia-oxidizing bacteria (AOB) and ANAMMOX bacteria in the system played dominant roles separately in different stages, which maintained the acid-base balance and achieved efficient removal of NH4+-N (98.8%). A long-term experiment showed that the PN/A double-bacteria-layer system improved the utilization of dissolved oxygen (DO) and enhanced the stability and nitrogen removal efficiency, with limited dissolved oxygen. The nitrogen removal efficiency of the PN/A double-bacteria-layer system remained stable at~80% when the influent NH4+-N was 200 mg·L-1 or 400 mg·L-1 in the presence of 1.0 mg·L-1 DO, whereas those of the control group were only 58.1% and 61.4%, respectively. When influent NH4+-N and DO were 400 mg·L-1 and 3.0 mg·L-1, respectively, the PN/A double-bacteria-layer system achieved a nitrogen removal efficiency, nitrogen loading rate (NLR), and nitrogen removal rate (NRR) of 87.9%, 0.4 kg·(m3·d)-1, and 12.8 mg·(g·h)-1, respectively.
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