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Bioresource Technology
Volume 347, 2022, 126623

Performance and mechanism analysis of gel immobilized anammox bacteria in treating different proportions of domestic wastewater: a valid alternative to granular sludge

XiaoTong Wanga, Hong Yanga,b, YaKun Zhoub, XuYan Liua

Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, College of Architectural Engineering, Beijing University of Technology, Beijing 100124, China.

Abstract

The treatment performance of anaerobic ammonia oxidation (anammox) immobilized filler on different proportions of domestic wastewater was evaluated. The results showed that, in comparison to synthetic wastewater, 50% domestic wastewater promoted the anammox reaction of immobilized filler, while 100% domestic wastewater had no significant effect on the anammox activity of immobilized filler but the total nitrogen removal efficiency (TNRE) was improved through enhanced denitrification. The TNRE of the immobilized filler was 82.5%, which was significantly higher than that of AnGS (69.7%), and its average anammox contribution rate was more than 90%. This was because the encapsulated anammox biomass could better maintain competitive advantages and coordinate the symbiotic relationship with denitrifying bacteria. Moreover, lower NH4+-N concentration resulted in greater influence of C/N ratio on anammox performance than COD concentration, while the opposite was true at high NH4+-N concentration. This study verified that anammox immobilized filler is effective for mainstream applications.

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