Reactivation of effluent granular sludge from a high-rate Anammox reactor after storage

Biodegradation
Guang-Feng Yang, Ren-Cun Jin

Abstract

In this study, effluent sludge from a high-rate Anammox reactor was used to re-start new Anammox reactors for the reactivation of Anammox granular sludge. Different start-up strategies were evaluated in six upflow anaerobic sludge blanket (UASB) reactors (R(1)-R(6)) for their effect on nitrogen removal performance. Maximal nitrogen removal rates (NRRs) greater than 20 kg N/m(3)/day were obtained in reactors R(3)-R(5), which were seeded with mixed Anammox sludge previously stored for approximately 6 months and 1 month. A modified Boltzmann model describing the evolution of the NRR fit the experimental data well. An amount of sludge added to the UASB reactor or decreasing the loading rate proved effective in relieving the substrate inhibition and increasing the NRR. The modified Stover-Kincannon model fit the nitrogen removal data in the Anammox reactors well, and the simulation results showed that the Anammox process has great nitrogen removal potential. The observed inhibition in the Anammox reactors may have been caused by high levels of free ammonia. The sludge used to seed the reactors did not settle well; sludge flotation was observed even after the reactors were operated for a long time at a floating upward velocity (F(s))...Continue Reading

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Citations

Dec 18, 2013·Bioresource Technology·Qian-Qian ZhangRen-Cun Jin
Sep 7, 2014·Journal of Environmental Sciences (China)·Yuan LiHengfeng Miao
Oct 23, 2015·Bioresource Technology·Zheng-Zhe ZhangRen-Cun Jin
Sep 5, 2015·Journal of Hazardous Materials·Zheng-Zhe ZhangRen-Cun Jin
Sep 8, 2015·Journal of Hazardous Materials·Zheng-Zhe ZhangRen-Cun Jin
Jul 13, 2016·Environmental Technology·Lu CaiXiao-Ming Wan
Sep 11, 2016·Journal of Hazardous Materials·Qian-Qian ChenRen-Cun Jin
Sep 2, 2017·Environmental Technology·Lihong YeHuiping Zeng
Jan 23, 2021·Scientific Reports·Qinyu LiHongchen Wang
Feb 22, 2021·The Science of the Total Environment·Jinxing WangZhen He

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