Article
Agricultural Engineering
Wenkang Lu, Bin Ma, Qingqing Wang, Yan Wei, Zengjian Su
Summary: An advanced nitrogen removal process was developed using simultaneous endogenous denitratation/anammox (EDA) in a sequencing batch reactor, achieving TN removal with an effluent TN of 1.87 mg/L. Anammox bacteria and denitrifying glycogen accumulating organisms (DGAOs) played key roles in providing nitrite for anammox, contributing to 76% of TN removed in the EDA process. This promising technique aimed to reduce oxygen and carbon source consumptions for advanced nitrogen removal.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Wenyu Li, Qiong Zhang, Jianwei Li, Ruitao Gao, Chengkun Kao, Xiyao Li, Yongzhen Peng
Summary: Nitrogen removal from saline municipal wastewater has become an area of interest, leading to the development of the energy-efficient technique of anaerobic ammonium oxidation (anammox) for advanced nitrogen removal. This study investigated the long-term salt adaptation and evolution mechanisms of an anammox-based process under different salinities. The results showed that the anammox bacteria had strong adaptability to salinity, with contribution levels of over 85% even at high salinity levels. Metagenomic sequencing revealed that the production of multiple nitrite substrates by specific bacteria ensured a high anammox contribution. This study provides valuable insights for the improved application of anammox-based processes in saline wastewater treatment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Engineering, Environmental
Peng Wu, Junjiang Chen, Vijay Kumar Garlapati, Xingxing Zhang, Francis Wani Victor Jenario, Xiang Li, Wenru Liu, Chongjun Chen, Tejraj M. Aminabhavi, Xiaonong Zhang
Summary: This study presents a comprehensive review of the anammox process, the advancements in nitritation and denitratation processes, and proposes a novel wastewater treatment method for efficient nitrogen removal.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Wenyu Li, Xiyao Li, Jianwei Li, Ruitao Gao, Chengkun Kao, Qiong Zhang, Xiaohang Hou, Yongzhen Peng
Summary: This study evaluated the stability of a step-feed bioreactor dominated by denitratation/anammox (PD/A) for treating municipal wastewater with decreased temperature. By operating at low temperature, the nitrogen removal efficiency (NRE) was improved, and the contribution of anammox increased. The study also identified the key microbial populations responsible for denitrification and anammox in the system. This research provides an optimistic prospect for promoting anammox in mainstream applications at low temperature.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Article
Engineering, Environmental
Qiongpeng Dan, Rui Du, Tong Wang, Tiantian Sun, Honggui Han, Xiaorong Zhu, Xiyao Li, Qiong Zhang, Yongzhen Peng
Summary: A hybrid system of anammox combined with heterotrophic endogenous metabolisms was developed in a single-stage bioreactor to treat real domestic wastewater. Nitrogen removal was achieved at a low carbon to nitrogen ratio and maintained under an extremely low ratio. The coexistence and enrichment of different bacteria contributed to the co-metabolism of carbon, nitrogen, and phosphorus.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Wenyu Li, Yongzhen Peng, Ruitao Gao, Qiong Zhang, Xiyao Li, Chengkun Kao, Jianwei Li
Summary: This study investigates the impact of low salinity levels on a double-anammox system in treating municipal wastewater, finding that a salinity of 1.0% led to a nitrogen removal efficiency of 81.2%, with a significant contribution of 76.5% from anammox. Low salinity was also found to promote nitritation and denitratation, enhancing the overall nitrogen removal efficiency. The enrichment of specific microbial populations, such as Ca. Brocadia and Nitrosomonas, further supported the effectiveness of the double-anammox process in treating saline wastewater.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Lan Lin, Zibin Luo, Yanlong Zhang, Yuanyuan Ren, Yu-You Li
Summary: This study successfully initiated the PD-anammox process by using high-strength anammox granules as seed sludge. The continuous operation achieved efficient nitrogen removal and stable PD-anammox relationship. The enrichment of PD bacteria and the abundance of dominating anammox bacteria were also relatively high in this process.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Feng Zhou, Wan-Zi Xiao, Kai-Yuan Zhou, Jin-Long Zhuang, Xu Zhang, Yong-Di Liu, Bing-Jie Ni, James P. Shapleigh, Min Zhou, Xi-Zi Luo, Wei Li
Summary: This study developed a novel one-stage nitrogen removal method that integrates partial nitrification, anammox, and denitratation for the treatment of low C/N wastewater. The expression of key genes for nitritation, anammox, and denitratation increased as reactor performance improved. Analysis of the metagenome revealed the dominant genera of ammonium-oxidizing bacteria, anammox bacteria, and denitratation bacteria. Mass balance confirmed that anammox was the dominant nitrogen removal pathway.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Jinxiao Pang, Jin Li, Rong Chen, Hui Lu
Summary: The MSADA process utilizing halophilic marine anammox bacteria (MAB) showed high efficiency in removing nitrogen and sulfide from seawater-based wastewater under the optimum S/N ratio of 0.75. The dominant functional microorganisms were identified as Candidatus Scalindua, Sulfurimonas and Sulfurovum, all of which exhibited excellent salt tolerance. Nitrate reductase activity was higher than nitrite reductase activity in the system, allowing for effective reduction of NO3--N to NO2--N for MAB. This coupled process offers a new perspective for the treatment of seawater-based wastewater.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Kester McCullough, Stephanie Klaus, Michael Parsons, Christopher Wilson, Charles B. Bott
Summary: Mainstream shortcut nitrogen removal processes have the potential to reduce operational costs, carbon footprints, increase carbon capture, and treatment plant capacity. However, there is a lack of operational or performance data for full-scale mainstream shortcut nitrogen removal. Existing literature often overlooks the role of influent carbon and the discussion of capacity increases from anammox processes.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Lin Wang, Songhao Shang, Wenzhi Liu, Dongli She, Wei Hu, Yi Liu
Summary: The study investigated the variation of nitrogen components in different aquatic ecosystems and found that nitrogen removal occurred during water flow, with a reduction rate of up to 43%. The heterogeneity in eco-stoichiometric characteristics of nitrogen components was higher in ditches and ponds compared to rivers and reservoirs. Ditches and ponds showed stronger interactions between overlying water and sediment, with higher rates of denitrification and anaerobic ammonium oxidation. The findings emphasize the importance of focusing on the upper reaches of agricultural catchments for nitrogen removal and developing region-specific conservation strategies to mitigate nitrogen pollution and protect water resources.
Article
Agricultural Engineering
Yiling Wu, Xingxing Zhang, Junjiang Chen, Chaochao Wang, Xiaonong Zhang, Jiaqiao Chen, Tianning Cai, Wenru Liu, Xiang Li, Peng Wu
Summary: This study presents a novel integrated fermentation, nitrification, denitration, and anammox process for efficient nitrogen removal in domestic sewage. The results show a high TN removal efficiency of 94.1% and a low effluent TN concentration of 3.6 mg/L. Microflora analysis identifies the key bacteria involved in organic decomposition and nitrogen metabolism in the system.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Xingxing Zhang, Peng Wu, Lezhong Xu, Liping Ma
Summary: This study proposed a novel simultaneous partial nitritation, denitratation and anammox process for efficient total nitrogen removal. Controlling aerobic duration and dissolved oxygen concentration could enhance microbial activity and stable suppression of nitrite-oxidizing bacteria.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Xiu Yue, Ao You, Yang Liu, Mincheng Lai, Kun Zhang
Summary: This research investigates the effect of low-concentration methanol on the functional microorganisms and nitrogen removal in the CANON system. The results show that low-concentration methanol suppresses the anaerobic ammonium-oxidizing bacteria (AnAOB) activity while promoting the nitrifying oxidizing bacteria (NOB) activity. This leads to a decrease in the removal rate of ammonium nitrogen and total nitrogen. However, the CANON system demonstrates a high self-healing ability when methanol supply is stopped.
WATER SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Environmental
Amin Mojiri, John L. Zhou, Harsha Ratnaweera, Akiyoshi Ohashi, Noriatsu Ozaki, Yoshiteru Aoi, Mohammadtaghi Vakili, Tomonori Kindaichi
Summary: Anaerobic ammonia oxidation (anammox) is an environmentally friendly and cost-effective method for nitrogen treatment, but has drawbacks such as slow growth rate and negative effects of high concentrations of nitrite, ammonia, and other pollutants. This study found that attaching anammox to chitosan improved its performance, with the chitosan/anammox reactor showing better nitrogen removal efficiency compared to the sole anammox reactor. Additionally, the study demonstrated that chitosan not only enhanced nitrogen removal by anammox but also improved its resistance to metals.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Civil
YeoJin Ju, Arash Massoudieh, Dugin Kaown, Yoon-Yeol Yoon, Kang-Kun Lee
JOURNAL OF HYDROLOGY
(2020)
Article
Engineering, Environmental
Khoa Nam Ngo, Tim Van Winckel, Arash Massoudieh, Bernhard Wett, Ahmed Al-Omari, Sudhir Murthy, Imre Takacs, Haydee De Clippeleir
Summary: This study developed an empirical function based on a practical experimental approach to calculate the settling coefficient r(p) value, improving the accuracy and predictive power of settling clarifier models. The proposed empirical function was validated over four years with five different sludge types, demonstrating good effluent quality prediction and advancing the predictive capabilities of clarification models towards effluent quality and clarifier performance.
Article
Environmental Sciences
YeoJin Ju, Arash Massoudieh, Christopher T. Green, Kang-Kun Lee, Dugin Kaown
Summary: This study was conducted in a coastal aquifer near the Yellow Sea in South Korea, using multiple age tracers for Bayesian inference to investigate groundwater age distributions and associated uncertainties. The results revealed complex age distributions near seawater intrusion areas and upland recharge zones, indicating converging paths of different ages in these regions. The Bayesian inference identified significant uncertainties, particularly for older age distributions, providing insights into flow dynamics at a complex seawater interface.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Priyanka Ali, Nadezhda Zalivina, Tri Le, Rumana Riffat, Sarina Ergas, Bernhard Wett, Sudhir Murthy, Ahmed Al-Omari, Christine DeBarbadillo, Charles Bott, Haydee De Clippeleir
Summary: Primary sludge fermentate was evaluated as an alternative carbon source for mainstream partial denitrification-anammox (PdNA). While high partial denitrification efficiency was achieved in batch experiments with fermentate, lower efficiency was observed in pilot studies. The application of PdNA with fermentate can result in significant methanol cost savings.
WATER ENVIRONMENT RESEARCH
(2021)
Article
Engineering, Environmental
Sarah Schoepflin, Justin Macmanus, Chenghua Long, Kester McCullough, Stephanie Klaus, Haydee De Clippeleir, Chris Wilson, Mike Parsons, Kartik Chandran, Charles Bott
Summary: This study evaluated startup strategies for mainstream polishing anammox moving bed biofilm reactors (MBBRs) without AMX biomass inoculation. It was found that AMX can be grown on carriers without seeding under mainstream conditions, and using preliminary biofilm carriers can decrease startup time.
WATER ENVIRONMENT RESEARCH
(2022)
Article
Engineering, Environmental
Mojolaoluwa Ladipo-Obasa, Nicole Forney, Rumana Riffat, Charles Bott, Christine DeBarbadillo, Haydee De Clippeleir
Summary: This study examines the feasibility of using raw fermentate for mainstream partial denitrification-anammox (PdNA) in an integrated fixed-film activated sludge (IFAS) process. The research finds that PdNA selection can be achieved even with low-quality fermentate and identifies nitrate residual as a key factor in PdNA efficiency. The study also highlights the potential for significant savings in methanol and reduced carbon footprint by integrating PdNA upstream from polishing aeration and anoxic zones.
WATER ENVIRONMENT RESEARCH
(2022)
Article
Engineering, Environmental
Rahil Fofana, Michael Parsons, Chenghua Long, Kartik Chandran, Kimberly Jones, Stephanie Klaus, Bob Trovato, Chris Wilson, Haydee De Clippeleir, Charles Bott
Summary: This study demonstrates the successful long-term operation of a full-scale mainstream anammox application under temperate climate. The implementation of partial denitrification-anammox (PdNA) achieved efficient nitrogen removal without nitrite oxidizing bacteria (NOB) out-selection. PdNA implementation resulted in significant savings and capacity enhancement.
WATER ENVIRONMENT RESEARCH
(2022)
Article
Engineering, Environmental
Gamze Kirim, Kester McCullough, Thiago Bressani Ribeiro, Carlos Domingo-Felez, Haoran Duan, Ahmed Al-Omari, Haydee De Clippeleir, Jose Jimenez, Stephanie Klaus, Mojolaoluwa Ladipo-Obasa, Javad Mehrani, Pusker Regmi, Elena Torfs, Eveline I. P. Volcke, Peter A. Vanrolleghem
Summary: This article provides an overview of the current state-of-the-art in modelling short-cut nitrogen removal processes in mainstream wastewater treatment, identifying future research directions and challenges. The importance of mathematical models in considering N2O emissions and the need for new, advanced approaches are emphasized.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Environmental
Wafaa Ali, Husna Takaijudin, S. R. M. Kutty, Arash Massoudieh
Summary: This study reports the results of nitrogen and phosphorus removal using modified bioretention systems. Sequencing these systems in a series maintained the continuity of nutrient removal. Durian peel is considered a promising material that can enhance the water quality in bioretention systems, outperforming coconut husk.
JOURNAL OF ECOLOGICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Justin Macmanus, Chenghua Long, Stephanie Klaus, Michael Parsons, Kartik Chandran, Haydee De Clippeleir, Charles Bott
Summary: A pilot study was conducted to investigate the carbon demand requirements and nitrogen removal capabilities of two mainstream partial denitrification/anammox (PdNA) processes. The study found that despite relatively low and unstable partial denitrification efficiencies, both processes exhibited low effluent total nitrogen concentrations and carbon requirements, making them suitable for water resource recovery facilities.
WATER ENVIRONMENT RESEARCH
(2022)
Article
Engineering, Environmental
Khoa Nam Ngo, Patrexia Tampon, Tim Van Winckel, Arash Massoudieh, Belinda Sturm, Charles Bott, Bernhard Wett, Sudhir Murthy, Siegfried E. Vlaeminck, Christine DeBarbadillo, Haydee De Clippeleir
Summary: This study proposes a novel control approach using bioflocculation boundaries to enhance effluent quality and stability in high-rate activated sludge (HRAS) systems. The control strategy manipulates the wasting setpoint based on the oxygen uptake rate (OUR) ratio to overcome bioflocculation limitation and maintain effluent quality. Significant improvements in effluent quality, solids capture, and COD capture were achieved with this control approach.
WATER ENVIRONMENT RESEARCH
(2022)
Article
Engineering, Environmental
Manal Osman, Husna Takaijudin, Arash Massoudieh, Hui Weng Goh
Summary: This study used Cascaded Bioretention to enhance nutrient removal from agricultural runoff. Increasing the number of treatments significantly improved nitrogen removal, while phosphorus removal was less sensitive to treatment frequency.
ENVIRONMENTAL ENGINEERING RESEARCH
(2023)
Article
Water Resources
Mohammad Almadani, Christopher Nietch, Arash Massoudieh
Summary: This study aimed to evaluate the effectiveness of different stormwater control measures (SCMs) design scenarios on streamflow at the watershed scale. The results showed that at least a 50% retrofit of runoff from impervious areas would be needed to achieve similar predevelopment flows. Concentrating the SCMs in the lower portion of the watershed resulted in more effectively achieving the predevelopment exceedance curves than uniform SCM implementation.
JOURNAL OF SUSTAINABLE WATER IN THE BUILT ENVIRONMENT
(2023)
Article
Computer Science, Interdisciplinary Applications
Arash Massoudieh, Khiem Nguyen, Sudhir Murthy
Summary: Sub-disciplines within the water sector are divided into specialty domains, resulting in modeling tools for flow and water quality based on pre-determined equations. However, there is a need to integrate different sets of equations to address complex problems that involve interactions between multiple domains. This paper presents an extensible modeling framework that allows user-defined model components to be added using plugins, enabling adaptability to specific needs and objectives. The framework's data structure for describing model components, properties, and equations used for computation is also discussed. Four examples highlighting the multi-domain capability of the framework are provided.
ENVIRONMENTAL MODELLING & SOFTWARE
(2023)
Article
Engineering, Environmental
Mojolaoluwa Ladipo-Obasa, Nicole Forney, Audra Foster, Evalyn Maxwell, Chenghua Long, Kartik Chandran, Rumana Riffat, Charles Bott, Christine deBarbadillo, Haydee De Clippeleir
Summary: This study reveals the importance of probe reliability and sensitivity in achieving high partial denitrification efficiency and reducing carbon overdosing events. An average PdN efficiency of 76% was achieved in a hybrid granule-floc system with acetate as the carbon source. Thauera was identified as the dominant PdN species, while Candidatus Brocadia was the main anoxic ammonium oxidizing bacteria species. Methanol use for post-polishing did not negatively impact AnAOB activity and growth.
WATER ENVIRONMENT RESEARCH
(2023)
