Development of a Hybrid Partial-Nitrification and Anammox Reactor with Stirrer
Liting Lyu 1
Yufang Zhu 1
Kuo Zhang 1
Yongguang Ma 2  
Yuan Pan 1
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Institute of Process Equipment and Environmental Engineering, School of Mechanical Engineering and Automation, Northeastern University, Shenyang, P.R. China
Liaoning Provincial Machinery Research Institute Co., Ltd., Shenyang, P.R. China
Yongguang Ma   

Liaoning Provincial Machinery Research Institute Co., Ltd., Wenhua Road 3-11, Heping, 110004 Shenyang, China
Online publish date: 2018-12-12
Publish date: 2019-02-18
Submission date: 2018-01-31
Final revision date: 2018-03-26
Acceptance date: 2018-03-27
Pol. J. Environ. Stud. 2019;28(3):1813–1820
This study developed the hybrid partial-nitrification and anammox (HPNA) reactor to increase efficiency in ammonia nitrogen (NH4+-N) removal. The HPNA reactor contained a fixed bed filled with biofilm carrier and a fluidized bed with mechanical stirrer to maximize withholding the sludge. The reactor achieved a total nitrogen (TN) removal efficiency of 70% and NH4+-N removal efficiency of 84%. The maximum nitrogen loading rate (NLR) of 6.1 kg-N/m3/d and nitrogen removal rate (NRR) of 4.7 kg-N/m3/d were achieved with a short hydraulic retention time (HRT) of 3 h. After 160 days of operation, both the mixed liquid suspended solids (MLSS) and the mixed liquor volatile suspended solids (MLVSS) increased in the lower part (from 3.7 to 14.7 g/L and 1.8 to 10.9 g/L, respectively) and the upper part (from 3.7 to 11.8 g/L and 1.9 to 6.7 g/L, respectively). The proteins (PN)/ polysaccharides (PS) ratio increased from 0.96 to 1.1 in the lower part but decreased to 0.7 in the upper part. Bacterial community profiles generated from 16S rRNA sequences further showed that the ammonium-oxidizing bacteria (AOB) Nitrosomonas and the anammox bacterium Brocadiales were enriched in the HPNA reactor.