Effect of operational strategies on the rapid start-up of nitrogen removal aerobic granular system with dewatered sludge as inoculant

Bioresource Technology
Lei WangYong Zeng

Abstract

In both sequencing batch reactors with dewatering sludge as inoculant, the strategies by step-feeding (R1) or step-feeding combined with low aeration (R2) were performed under alternating anoxic/aerobic condition to discover superior methods launching nitrogen removal aerobic granule system. Interestingly, two reactors accomplished granulation at day 0, two days later, possessed prominent settling performance (SVI < 45 ml/g. MLSS) and denitrifying ability (TIN > 80%). Thereinto, R2 had lower crushing rate, larger granules, higher biomass and better pollutant removal performance owing to low aeration and more filamentous bacteria on AGS surface. Moreover, effluent NH4+-N was used as indicator of excess filaments due to its quick response for the filaments. After effluent NH4+-N exceeded 5 mg/L, causative filaments Sphaerotilus were effectively inhibited and eliminated by enhancing pH value to 8.0 ± 0.2. As a result, this study provides a new insight into rapid start-up nitrogen removal granule system by promoting and limiting filaments in proper period.

References

Jun 28, 2005·Water Research·A Mosquera-CorralM C M van Loosdrecht
Mar 10, 2006·Journal of Biotechnology·Yong-Qiang Liu, Joo-Hwa Tay
Feb 13, 2007·Applied Microbiology and Biotechnology·Yong-Qiang Liu, Joo-Hwa Tay
Dec 29, 2007·Journal of Hazardous Materials·Sunil S Adav, Duu-Jong Lee
Mar 15, 2011·Journal of Hazardous Materials·Fang-yuan ChenPing Ning
Apr 12, 2014·Water Research·Carles Pellicer-Nàcher, Barth F Smets
Dec 30, 2018·Water Research·Xianwei WuGuoqiang Liu
Jul 10, 2019·Journal of Environmental Sciences (China)·Quan YuanKaijun Wang

❮ Previous
Next ❯

Related Concepts

Related Feeds

Biomechanics

Biomechanics examines the generation of internal forces within the body and investigates the effects and control of forces that act on or are produced on tissues. Here are the latest discoveries.