Achieving short-cut nitrification and denitrification in modified intermittently aerated constructed wetland. (May 2017)

• Record Type: Journal Article
• Authors: Hou, Jie; Xia, Ling; Ma, Tao; Zhang, Yiqing; Zhou, Yiyong; He, Xugang
• Is Part Of: Bioresource technology. Volume 232(2017)
• Page Start: 10
• Page End: 17
• Publication Date: 2017-05
• Subjects: Nitrogen removal pathway -- Intermittent aeration control -- Partial nitrification -- Vertical flow constructed wetland; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.02.027
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Nitrogen removal from nitrite pathway was achieved in CWs. Enhanced TN removal and reduced aeration costs were achieved. Appropriate alternating anoxic/aerobic condition results in nitritation. Abstract: This study aim to enhance nitrogen removal performance via shifting nitrogen removal pathway from nitrate to nitrite pathway. It was demonstrated that nitrite pathway was successfully and stably achieved in CWs by using modified intermittent aeration control with aeration 20 min/non-aeration 100 min and reducing DO concentration during aeration, nitrite in the effluent could accumulate to over 70% of the total oxidized nitrogen. Q-PCR analysis showed that nitrifying microbial communities were optimized under the alternating anoxic and aerobic conditions, ammonia oxidizing bacteria increased from 7.15 × 10 6 to 8.99 × 10 6 copies/g, while nitrite oxidizing bacteria decreased approximately threefold after 234 days operation. Most importantly, high nitrogen removal efficiency with ammonium removal efficiency of 94.6%, and total nitrogen removal efficiency of 82.6% could be achieved via nitrite pathway even under carbon limiting conditions. In comparison to the nitrate pathway, the nitrite pathway could improve the TN removal by about 55%.