Article
Agricultural Engineering
Hong Wang, Chen Chen, Enzhe Yang, Zhi Tu, Jie Liang, Xiaohu Dai, Hong Chen
Summary: This study compared the performance characteristics of PNA systems with and without carriers in treating wastewater. The results showed that both the suspended sludge system and the biofilm system achieved stable nitrogen removal efficiencies. The biofilm system had a longer start-up time but demonstrated stable performance under aeration shock. The suspended sludge system displayed good elasticity for performance recovery. Controlling dissolved oxygen could enhance the activity and abundance of functional microbes.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Kai Lv, Dangcong Peng, Yun Han, Lifang Yu
Summary: Enrichment and accumulation of anammox bacteria in aerobic biofilm is crucial for successful nitrogen removal in municipal wastewater treatment plants. This study detected a relatively high percentage of anammox bacteria in the biofilm of two WWTPs in Xi'an, China, and estimated their contribution to nitrogen removal. These findings suggest that aerobic biofilm could enhance nitrogen removal in mainstream.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Environmental Sciences
Rui Xiao, Wanlu Zhu, Shaoyi Xu, Wenbo Chai, Yu Tong, Ping Zheng, Huijie Lu
Summary: The lab-scale mainstream anammox moving bed biofilm reactor (MBBR) was successfully started in 120 days with stepwise decrement in influent nitrogen concentration, showing the initial colonization by Candidatus Jettenia and filamentous fermenter Anaerolineaceae potentially mediated by hydrophobic interaction and type IV pilus. A novel mainstream anammox biofilm development (MABD) model was constructed to describe biofilm growth, population dynamics, and nitrogen removal performance, providing insights for the design and operation of mainstream anammox processes towards higher biofilm biomass and nitrogen removal efficiency.
ENVIRONMENT INTERNATIONAL
(2022)
Article
Agricultural Engineering
Jianhua Zhang, Yuanyuan Miao, Yawen Sun, Qiong Zhang, Jiatong Dai, Yongzhen Peng
Summary: The feasibility of in situ start-up of mainstream anammox process was investigated in three parallel sequencing batch biofilm reactors (SBBRs) inoculated with different sludges. The strategy achieved desirable nitrogen removal efficiency of about 86% and identified anammox as the primary nitrogen transformation pathway.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Fen Wang, Sihan Xu, Lingjie Liu, Siyu Wang, Min Ji
Summary: The study investigated a one-stage partial nitrification and anammox process in a lab-scale biofilm reactor, observing that temperature variations have an impact on nitrogen removal efficiency and microbial community structure.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Ting Xie, Xinyu Liu, Yiming Xu, Samuel Bryson, Lu Zhao, Kai Huang, Shiqi Huang, Xiaoming Li, Qi Yang, Huiyu Dong, Mari-Karoliina H. Winkler
Summary: Simultaneous removal of ammonium and nitrate was achieved in a methane-fed moving bed biofilm reactor (MBBR) through the collaboration of methanotrophic microorganisms, denitrifiers, and anaerobic ammonium oxidizing bacteria.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Mathematical & Computational Biology
Fabiana Russo, Alberto Tenore, Maria Rosaria Mattei, Luigi Frunzo
Summary: This work proposes a mathematical model to describe the start-up process of partial nitritation/anammox granular bioreactors, focusing on the formation and development of anammox granules. The model investigates the role of anaerobic ammonia-oxidizing bacteria invasion in the formation of anammox granules and the impact of two key parameters in the start-up process.
MATHEMATICAL BIOSCIENCES AND ENGINEERING
(2022)
Review
Environmental Sciences
Lan Lin, Yanlong Zhang, Yu-You Li
Summary: This study reviews strategies for promoting the formation of anammox granules and the start-up of the anammox process. It introduces the formation mechanism of anammox granules, the operational performance of various strategies, and their promotion mechanisms. It provides guidance and reference for the cultivation of granular-anammox sludge, the start-up of the anammox process, and its practical application.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Mathematical & Computational Biology
Fabiana Russo, Alberto Tenore, Maria Rosaria Mattei, Luigi Frunzo
Summary: A mathematical model on PN/A granular bioreactors is proposed, focusing on the start-up phase. The model predicts and controls the development of granular biofilms and studies the distribution of different microbial species. The simulation results are reliable and can be used for the start-up procedures of large-scale reactors.
MATHEMATICAL BIOSCIENCES AND ENGINEERING
(2022)
Article
Environmental Sciences
Youqi Tao, Rui Shi, Linjing Li, Suhui Xia, Jianyong Ning, Wenlai Xu
Summary: This study addressed the issues of sludge floating and uneven mass transfer in up-flow partial denitrification/anammox (PDA) reactors by implementing two strategies: adding biological carriers and applying mechanical stirring. The results showed that both strategies effectively prevented sludge flotation and deterioration of settling performance. Mechanical agitation had a more significant positive impact on PDA performance compared to the addition of biocarriers as it achieved more adequate mass transfer.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Dora Olsheimer, Jes la Cour Jansen, David J. I. Gustavsson
Summary: Implementing anammox based processes in the mainstream at municipal wastewater treatment plants is challenging and requires carefully constructed control strategies. A reliable method to measure the specific anammox activity was developed and implemented in a pilot plant. The study analyzed the influence of initial nitrite and ammonium concentrations on the activity, as well as the temperature dependency.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Engineering, Environmental
Ellen Edefell, Per Falas, Elena Torresi, Marinette Hagman, Michael Cimbritz, Kai Bester, Magnus Christensson
Summary: A novel process configuration with additional substrate from primary treated wastewater was designed to improve micropollutant removal in MBBRs with low substrate availability. The recirculating MBBR showed a significant increase in biomass concentration and micropollutant degradation rates, with aerobic conditions being critical for high degradation rates. The results suggest that degradation rates normalized to carrier surface area can facilitate the comparison of different biofilm systems.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Hui Chen, Shenbo Cao, Linlin Chen, Zhicheng Zhang, Juesheng Tian, Rencun Jin, Jun Yao
Summary: Biochar was used to promote the rapid establishment of an anaerobic ammonium oxidation (anammox) reactor without temperature control. The addition of coconut and apricot charcoal significantly reduced the start-up time of the reactors. Biochar enhanced the electron transfer capacity and increased the abundance of functional genes related to the anammox pathway, resulting in improved nitrogen removal efficiency.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
Ying-yu Li, Xiao-wu Huang, Xiao-yan Li
Summary: In this study, a new sludge seeding strategy was developed for the start-up of PNA-IFAS using pre-cultivated anammox biofilms, significantly shortening the start-up period and improving nitrogen removal efficiency. The use of anammox biofilms promoted biofilm development and reduced the enrichment of unwanted nitrite-oxidizing bacteria (NOB) in the bioreactor.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Xuejiao Yin, Jiaxin Wen, Yihang Zhang, Xin Zhang, Jujiao Zhao
Summary: The anammox process was studied in a single-stage moving bed biofilm reactor, and the excess removal of ammonia nitrogen was investigated. With the addition of internal circulation, the removal efficiency of ammonium reached about 96% and the total nitrogen removal efficiency reached about 86%.
Article
Engineering, Environmental
T. R. Devlin, A. di Biase, V. Wei, M. Elektorowicz, J. A. Oleszkiewicz
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2017)
Article
Engineering, Environmental
Tanner Ryan Devlin, Maciej S. Kowalski, Efren Pagaduan, Xugang Zhang, Victor Wei, Jan A. Oleszkiewicz
JOURNAL OF HAZARDOUS MATERIALS
(2019)
Article
Environmental Sciences
Maciej S. Kowalski, Tanner R. Devlin, Alessandro di Biase, Jan A. Oleszkiewicz
Article
Agricultural Engineering
Maciej S. Kowalski, Tanner R. Devlin, Alessandro di Blase, Jan A. Oleszkiewicz
BIORESOURCE TECHNOLOGY
(2019)