Review
Environmental Sciences
Jinxing Wang, Jidong Liang, Dingying Ning, Tengge Zhang, Meng Wang
Summary: This paper provides a comprehensive review of the advances, outstanding issues, and future research directions in the application of biomass immobilization techniques in anammox and PN/A systems. The review highlights the key characteristics of carriers for biomass immobilization and suggests the importance of further research and full-scale studies to overcome obstacles and improve immobilization performance.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Jinxing Wang, Jidong Liang, Li Sun, Jianqing Shen, Zhen He
Summary: This study investigated the use of gel beads to enhance the resistance of anammox biomass to low temperatures. The results showed that gel beads promoted the granulation of biomass and improved anammox activities in temperature transition. The study demonstrated an effective approach to increase anammox resistance at low operating temperatures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Biotechnology & Applied Microbiology
Kazuichi Isaka, Toshifumi Osaka, Yuya Kimura, Nanami Iwasaki, Satoshi Tsuneda
Summary: The methanol tolerance level of the anammox process was found to be low without acclimation, but could be increased through stepwise addition of methanol. Methanol was consumed along with nitrate or nitrite by heterotrophic denitrification.
BIOCHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Jiawei Wang, Si Zhang, Jun Li, Hong Yang
Summary: This study focused on treating municipal wastewater using a novel two-stage partial-nitritation/anammox (PN/A) process by gel immobilization. The gel immobilization technology effectively reduced the adverse effects of dissolved oxygen and organic matter in the PN reactor effluent on the anammox system, and the AC-SBR exhibited better nitrogen removal performance.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Environmental Sciences
Bolin Li, Yuqing Jiang, Yue Wang, Xiang Li, Kai Xia, Mengyuan Tian, Xiaoman He
Summary: In this study, PVA-SA and nano Fe2O3-PVA-SA entrapment beads were prepared to enhance the anammox sludge at low temperatures. The results showed that the nano Fe2O3-PVA-SA beads had the smallest decline and the highest recovery during the cooling operation. The entrapment could inhibit Nitrite oxidizing bacteria and improve the activity of denitrifying bacteria, thus promoting the removal of total nitrogen.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Agricultural Engineering
Lan Yang, Yujie Qin, Xiangyin Liu, Zhiju Liu, Shaohong Zheng, Jiannv Chen, Siyuan Gong, Junfeng Yang, Tiansheng Lu
Summary: This study applied gel immobilization technology to the ASDAD coupling system and found that the optimal S2-/NO3- ratio was 0.6, resulting in the highest TN removal efficiency. Additionally, immobilized sludge cubes attenuated the effects of temperature on microorganisms.
BIORESOURCE TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Adrian Ioan Dudu, Mihai Andrei Lacatus, Laszlo Csaba Bencze, Csaba Paizs, Monica Ioana Tosa
Summary: This study presents a simple enzymatic approach for the synthesis of short-chained flavor esters with high efficiency. By optimizing reaction conditions, the alcohol/enzyme ratio was reduced from 100:1 to 25:1, leading to significant improvements in reaction yields.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Agricultural Engineering
R. Reshmy, Eapen Philip, Ranjna Sirohi, Ayon Tarafdar, K. B. Arun, Aravind Madhavan, Parameswaran Binod, Mukesh Kumar Awasthi, Sunita Varjani, George Szakacs, Raveendran Sindhu
Summary: Nanobiocatalysts, produced by integrating advanced biotechnology and nanotechnology, show great potential in improving enzyme stability, function, and efficiency in bioprocessing. Functional nanostructures are used to create nanobiocatalysts, playing a critical role in controlling enzyme activity. Their enormous potential in designing effective laboratory trials and applications in various fields is extensively discussed.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Qi Gao, Shan-Wei Li, Yu-Jie Xie, Min-Xue Zheng, Jing Wei, Zhi-Jun Luo, Xiang-Tong Zhou, Zhi-Gang Liu, Yan Li, Zhi-Ren Wu
Summary: This study proposed the optimal preparation conditions and cultivation equipment of Ca-alginate cell beads for the culturing of anammox sludge. The prepared cell beads had regular spherical shapes, a uniform size, and hard texture. The anammox bacteria in the Ca-alginate cell beads exhibited fast growth and high activity due to diffusion limitations. The gel entrapment method was found to rapidly enrich anammox bacteria in a short period.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Wen-yan Wang, Ru Wang, Ghulam Abbas, Gang Wang, Zhi-guo Zhao, Liang-wei Deng, Lan Wang
Summary: This study investigates the effects of aggregation on the activity, growth, and reproduction of anammox bacteria. Results show that aggregation benefits the bacteria by enhancing their activity, relative abundance, growth, and reproduction rate.
Review
Biotechnology & Applied Microbiology
Dibyajit Lahiri, Moupriya Nag, Ankita Dey, Tanmay Sarkar, Rina Rani Ray, Maksim Rebezov, Mohammad Ali Shariati, Muthu Thiruvengadam, Jesus Simal-Gandara
Summary: Biofilm is a concern in hospitals and industries due to its negative effects on health and equipment. Using enzymes as anti-fouling agents, particularly when immobilized, has proven to be an effective and eco-friendly solution for inhibiting biofilm formation and removal.
BIOTECHNOLOGY PROGRESS
(2022)
Article
Environmental Sciences
Xiangyu Lin, Bolin Li, Mengyuan Tian, Xiang Li, Jun Wang
Summary: Using microbial immobilization technology to fix anaerobic ammonia oxidizing bacteria (AAOB) and sulfur oxidizing bacteria (SOB) on a polyvinyl alcohol-sodium alginate composite carrier can improve the nitrogen removal performance in low temperature environments. The gel provides insulation and enhances the low temperature resistance of internal sludge, protecting AAOB and SOB from oxygen inhibition and promoting the enrichment of denitrifying bacteria. The gel does not change the internal sludge species but can improve nitrogen removal efficiency by shifting the dominance of specific microorganisms.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Agricultural Engineering
Anna Dzionek, Danuta Wojcieszynska, Urszula Guzik
Summary: Xanthan gum, a exo-polysaccharide produced by bacteria, possesses unique non-Newtonian properties whose structure and conformation are greatly influenced by fermentation conditions, temperature, and ion concentration. While the crosslinked form of xanthan gum has shown potential in controlled drug delivery and improving survival rate of immobilized bacteria, current crosslinking procedures often involve toxic substances or harsh environmental conditions, limiting their use in live cell entrapment. This study summarizes a potentially less toxic crosslinking method and explores the utilization of xanthan gum in bioremediation studies and methods to prevent carrier accumulation in the environment.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Anran Fang, Kun Feng, Xiaoxue Mei, Bingfeng Liu, Guojun Xie, Nanqi Ren, Defeng Xing
Summary: A new strategy using ICIB and SIGA based on activated sludge inoculum was proposed for a faster start-up of anammox, promoting granulation and biofilm formation of anammox bacteria and improving nitrogen removal efficiency.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Jin Wang, Hua-Yi Cai, You-Peng Chen
Summary: The study investigated the performance of a novel core-shell embedded carrier on wastewater denitrification, confirming that spherical gel shape has a significant effect on nitrogen removal efficiency and identifying the stratified growth of different bacteria in the carrier.
ENVIRONMENTAL RESEARCH
(2022)