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Demystifying polyphosphate-accumulating organisms relevant to wastewater treatment: A review of their phylogeny, metabolism, and detection

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environmental Science and Ecotechnology 2024年第5期21卷 1-16页

作者： Lucia Ruiz-Haddad Muhammad Ali Mario Pronk Mark C.Mvan Loosdrecht Pascal E.Saikaly Environmental Science and Engineering Program Biological and Environmental Science and Engineering(BESE)DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal23955-6900Saudi Arabia Water Desalination and Reuse Center Biological and Environmental Science and Engineering(BESE)DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal23955-6900Saudi Arabia Department of Civil Structural&Environmental EngineeringTrinity College DublinThe University of DublinDublin2Ireland Department of Biotechnology Delft University of TechnologyDelft2629 HZthe Netherlands

Currently,the most cost-effective and efficient method for phosphorus(P)removal from wastewater is enhanced biological P removal(EPBR)via polyphosphate-accumulating organisms(PAOs).This study integrates a literature review with genomic analysis to uncover the phylogenetic and metabolic diversity of the relevant PAOs for wastewater *** findings highlight significant differences in the metabolic capabilities of PAOs relevant to wastewater ***,Candidatus Dechloromonas and Candidatus Accumulibacter can synthesize polyhydroxyalkanoates,possess specific enzymes for ATP production from polyphosphate,and have electrochemical transporters for acetate and *** contrast,Tetrasphaera,Candidatus Phosphoribacter,Knoellia,and Phycicoccus possess PolyP-glucokinase and electrochemical transporters for sugars/amino ***,this review explores various detection methods for polyphosphate and PAOs in activated sludge wastewater treatment ***,FISH-Raman spectroscopy emerges as one of the most advanced detection ***,this review provides critical insights into PAO research,underscoring the need for enhanced strategies in biological phosphorus removal.

关键词： Polyphosphate-accumulating organisms(PAOs) Enhanced biological phosphorus removal (EBPR)Tetrasphaera Ca.accumulibacter Ca.phosphoribacter Knoellia Phycicoccus

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Direct Multi-group Cross-sections via NJOY+OJOYU for PWR and FLiBe-MSR Reactor Systems

Direct Multi-group Cross-sections via NJOY+OJOYU for PWR and...

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2023 Transactions of the American Nuclear Society Annual Meeting and Technology Expo, ANS 2023

作者： Wang, Meng-Jen Simpson, Michael Sjoden, Glenn E. Nuclear Engineering Program Department of Civil and Environmental Engineering University of Utah United States Department of Material Science and Engineering University of Utah United States

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Influence of Superplasticizer on Workability and Early Strength of Fly Ash/Blast Furnace Slag Based Geopolymer Mortar 2nd

Influence of Superplasticizer on Workability and Early Stren...

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2nd International Conference on Sustainable civil engineering and Architecture, ICSCEA 2021

作者： Indriani, Kemala Saludung, Apriany Ogawa, Yuko Kawai, Kenji Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashihiroshima Japan Department of Civil and Environmental Engineering Graduate School of Engineering Hiroshima University 1-4-1 Kagamiyama Higashihiroshima Japan

ISBN: (纸本)9789811933028

Recent studies have shown the presence of ground granulated blast-furnace slag (GGBS) in fly ash based geopolymer induced denser microstructures and better compressive strength. However, the inclusion of GGBS gives rapid setting time despite its benefit in terms of mechanical properties and could cause difficulty in handling the geopolymer in its application such as troubles with delivery time of fresh mix geopolymer concrete. This study aims to investigate the effect of polycarboxylate based superplasticizer, which is commonly used in Portland cement concrete to improve the workability and achieve appropriate compressive strength, on the fresh properties and early strength of geopolymer mortar. Geopolymer mortar was composed of fly ash and GGBS acting as binder with sodium silicate and 12 M of sodium hydroxide solution as alkaline activator. Alkaline to binder and fly ash/GGBS ratios were kept constant at 0.5 and 1.5, respectively. Superplasticizer was added into alkaline solution before casting at various dosages of 0%, 1%, 2%, 4%, and 8% by the binder mass and all the specimens were cured in two regimes of heat curing and 20ºC curing. The results have shown that the inclusion of superplasticizer maintained the workability over the time and may delay the setting of geopolymer mortar. Moreover, the mixture with 8% superplasticizer had dense microstructure and comparable compressive strength to that without superplasticizer at the age of 7 days. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Compressive strength

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Financing mechanism for solid waste management in Anambra, Nigeria: analyses of emerging challenges and implication for circular economy

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environmental Science and Pollution Research 2024年第19期31卷 27634-27652页

作者： Ezeudu, Obiora B. Ugochukwu, Uzochukwu C. Industrial Ecology Program Department of Civil Engineering University of Victoria VictoriaBCV8W 2Y2 Canada Centre for Environmental Management and Control University of Nigeria Enugu Campus410001 Nigeria

Waste management is a critical public service provided by municipalities around the world. It is often problematic, inefficient, and abysmally performed in developing countries. Among the problems associated with waste management in these global locations is the issue of finance. Finance is required for both capital investment and operational costs. Methods of waste management financing differ from place to place due to cultural, political, and socio-economic peculiarities. Understanding these conditionalities is necessary to be able to proffer sustainable solutions. Despite these facts, there is limited comprehensive and relevant academic literature on waste management financing mechanisms in developing countries both in the past and recent times. This work addresses a significant gap in the literature by studying the mechanism for waste management financing in developing countries using Anambra State, Nigeria, as a case study. The current study further investigated the associated challenges and opportunities and made critical discussions on the implications on the circular economy. User fees and subsidies from the government are the major financing sources. The absence of cost-revenue model analysis, economic and institutional volatility, the unwillingness of the service users to pay fees, and lack of transparency are major challenges to the financial sustainability of waste management in the studied context. The creation of incentives for behavioral changes, adoption of neo-liberal policies, and formal integration of informal waste pickers are factors that can minimize the cost of waste management services while promoting a circular economy. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Sustainable development

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Performance Evaluation of Unpaved Roads Stabilized with Composite Geosynthetic Made of Recycled Plastic Geogrid and Nonwoven Geotextile

Performance Evaluation of Unpaved Roads Stabilized with Comp...

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Geotechnical Frontiers 2025: Foundations, Retaining Structures, and Geosynthetics

作者： Hasheminezhad, Araz Ceylan, Halil Kim, Sunghwan Tutumluer, Erol Dept. of Civil Construction and Environmental Engineering Program for Sustainable Pavement Engineering and Research Iowa State Univ. AmesIA United States Institute for Transportation Iowa State Univ. AmesIA United States Dept. of Civil and Environmental Engineering Univ. of Illinois at Urbana-Champaign UrbanaIL United States

ISBN: (数字)9780784485972

This paper presents recent findings from an ongoing research study to evaluate the effectiveness of a geosynthetic made from recycled plastic for stabilizing unpaved roads. In the state of Iowa, USA, two full-scale test sections were constructed: one stabilized with a newly developed composite geosynthetic, and the other serving as a control. This innovative geocomposite combines a geogrid made from recycled plastic and a nonwoven geotextile. Following construction, these unpaved test sections were exposed to real traffic loads that included trucks and implements of husbandry (farm equipment). The performance of reinforced unpaved roads was assessed using Lightweight Deflectometer (LWD) tests and field California Bearing Ratio (CBR) data collected using a clegg impact soil tester (CIST). The results indicated that unpaved roads stabilized with the geocomposite significantly reduced permanent deformation during the evaluation period. These findings suggest good potential of the geocomposite for enhancing unpaved road performance, pending further validation through continuous monitoring and evaluation of the test sections over longer periods. © ASCE.

关键词： Soil testing

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environmental Disinfection Based on Mobile Intelligent Networking Highly Efficient Ultraviolet Light Machines

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Aerosol and Air Quality Research 2024年第2期24卷 1-10页

作者： Chung, Chun-Yen Sung, Wen-Tsai Wang, Lin-Chi Siami, Lailatus Santos, John Paul Computer and Game Development Program Kun Shan University Tainan710303 Taiwan Department of Electrical Engineering National Chin-Yi University of Technology Taichung411030 Taiwan Department of Marine Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung81157 Taiwan Department of Environmental Engineering Chung Yuan Christian University Taoyuan32023 Taiwan Department of Civil Engineering Chung Yuan Christian University Taoyuan32023 Taiwan

Since 2019, the world has suffered from the outbreak of the "Coronavirus Disease (COVID)-19 pandemic. This study used the principle of Ultraviolet (UV)-C disinfection to produce a mobile high-power UV-C sterilizer. It focused on combining intelligent control systems, human sensors, and Internet of Things (IoT) systems to carry out disinfection tasks in unmanned indoor spaces. Because of its mobile nature, the sterilizer could be moved at any time in various learning, research, and activity rooms for disinfection. In addition to manually controlling the sterilizer, a Wi-Fi or Narrowband (NB)-IoT-enabled remote control was provided to start the disinfection process. In order to prevent ultraviolet light from harming the human body, sensors were employed self-acting to detect the presence of people and turn off the ultraviolet light when people were detected in the area. At the same time, a camera on the sterilizer would capture an image and notify the relevant personnel through a LINE notification, to prevent the human body from being exposed to ultraviolet light, causing harm to the teachers and students on campus. During operation, voice broadcast reminders and a status indicator could provide information about the operation status. After disinfection, users could view the disinfection process through a mobile device application or a webpage, which would automatically notify relevant personnel of the disinfection status through a LINE notification. In this way, the disinfection progress could be updated at anytime, anywhere and the current disinfection status in the classroom could be displayed in real-time, allowing teachers and students on campus to carry out teaching and learning in a safe and secure environment. © The Author(s).

关键词： Internet of things

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Machine learning in concrete science:applications,challenges,and best practices

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npj Computational Materials 2022年第1期8卷 1192-1208页

作者： Zhanzhao Li Jinyoung Yoon Rui Zhang Farshad Rajabipour Wil V.Srubar III Ismaila Dabo Aleksandra Radlińska Department of Civil and Environmental Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA Department of Structural Engineering Research Korea Institute of Civil Engineering and Building Technology(KICT)Goyang-si10223Republic of Korea Department of Civil Environmentaland Architectural EngineeringUniversity of Colorado BoulderBoulderCO80309USA Materials Science and Engineering Program University of Colorado BoulderBoulderCO80309USA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA

Concrete,as the most widely used construction material,is inextricably connected with human *** conceptual and methodological progress in concrete science,concrete formulation for target properties remains a challenging task due to the ever-increasing complexity of cementitious *** the ability to tackle complex tasks autonomously,machine learning(ML)has demonstrated its transformative potential in concrete *** the rapid adoption of ML for concrete mixture design,there is a need to understand methodological limitations and formulate best practices in this emerging computational ***,we review the areas in which ML has positively impacted concrete science,followed by a comprehensive discussion of the implementation,application,and interpretation of ML *** conclude by outlining future directions for the concrete community to fully exploit the capabilities of ML models.

关键词： concrete directions autonomous

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Effect of Molarity of Potassium Hydroxide Solution on Heat Resistance of Fly Ash-Slag Based Geopolymer 2nd

Effect of Molarity of Potassium Hydroxide Solution on Heat R...

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2nd International Conference on Sustainable civil engineering and Architecture, ICSCEA 2021

作者： Saludung, Apriany Azeyanagi, Takumu Ogawa, Yuko Kawai, Kenji Department of Civil and Environmental Engineering Graduate School of Engineering Hiroshima University 1-4-1 Kagamiyama Higashihiroshima City Japan Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashihiroshima City Japan

ISBN: (纸本)9789811933028

Designing a building material with high fire resistance is crucial for minimizing the impact of catastrophic fire. Geopolymer, a new type of binder synthesized by the reaction of aluminosilicate sources with an alkaline solution, has been extensively studied as it offers comparable or even high durability when compared to ordinary Portland cement (OPC). The concentration of the alkaline solution is one of the important factors that affect the durability;however, there is very little data on the heat resistance of geopolymer activated with potassium hydroxide. Thus, this study aims to investigate the effect of molarity of potassium hydroxide on the heat resistance of fly ash-slag blended geopolymer paste. The potassium hydroxide (10, 12, and 14 M) and sodium silicate solutions were prepared as activator solutions. The initial heat curing at 70 ºC for 24 h was applied. In addition, an OPC specimen was also prepared for comparison. After curing for 28 days, some specimens were exposed to high temperatures (500, 750, and 950 ºC). The compressive strength of unexposed and exposed geopolymer and OPC paste specimens was measured. The results showed that the increase of molarity of potassium hydroxide solution increased the heat resistance of geopolymer in terms of retained compressive strength. Moreover, the geopolymer specimens could maintain higher compressive strength than that of OPC paste when exposed to high temperatures up to 950 ºC. This is attributed to the mineral composition of geopolymer, which is different from OPC paste, as studied by X-ray diffraction analysis. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Potassium hydroxide

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Impact of Building Design and Operating Strategies on Urban Heat Island Effects Part II: Sensitivity Analysis

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Journal of engineering for Sustainable Buildings and Cities 2024年第3期5卷 031005页

作者： Ameer, Baqer Krarti, Moncef Department of Civil Environmental and Architectural Engineering Building Systems Program University of Colorado Boulder Boulder 80309 CO United States Kuwait Institute for Scientific Research Safat 13109 Kuwait

This study investigates the mutual thermal interactions between buildings and the microclimate within urban area centers. Buildings are the primary energy consumers in cities, and one of the main causes of the urban heat island (UHI) formation. In this article, a flexible simulation environment is developed and used to model the mutual thermal interactions between building energy systems and their urban surroundings in Phoenix, AZ, characterized by its hot climate. The impacts of various operating strategies for both commercial and residential buildings are assessed on both UHI effects and energy consumption. Specifically, the study evaluates the impacts of indoor temperature settings, precooling strategies, and air infiltration/exfiltration rates. It has been found that heat rejected by air conditioning systems significantly impacts UHI formation in urban centers located in hot climates. Specifically, commercial buildings were found to cause more UHI effects than residential buildings due to higher cooling loads. The impacts of heat rejected from heating, ventilating, and air conditioning (HVAC) systems are found to be more dominant than that from air exfiltration on the microclimate of urban centers. For urban center made up of commercial buildings with a street aspect ratio of 2, heat from air exfiltration is estimated to be as low as 10% of the heat rejected by HVAC systems. Copyright © 2024 by ASME.

关键词： air conditioning air infiltration building energy efficiency cities precooling controls temperature settings thermal mass urban heat island

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Identification of Extreme Precipitation Changes Due to Climate Change in Indonesia 3rd

Identification of Extreme Precipitation Changes Due to Clima...

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3rd International Conference on Radioscience, Equatorial Atmospheric Science and Environment, INCREASE 2023

作者： Aminah, Siti Riawan, Edi Syahputra, Muhammad Ridho Kuntoro, Arno Adi Master Program in Water Resource Management Faculty of Civil and Environmental Engineering Bandung Institute of Technology Bandung Indonesia Atmospheric Sciences Research Group Faculty of Earth Science and Technology Bandung Institute of Technology Bandung Indonesia Water Resources Engineering Research Group Faculty of Civil and Environmental Engineering Bandung Institute of Technology Bandung Indonesia

ISBN: (纸本)9789819707393

This study uses Global Precipitation Measurement (GPM) and Coupled Model Intercomparison Project Phase 6 (CMIP6) precipitation data to identify extreme precipitation intensity and frequency changes in Indonesia. Extreme precipitation calculations were performed using the Gumbel distribution and return period fitted to annual maxima data. Extreme precipitation and frequency of extreme events were compared between the historical period and the near-future period (2026–2055) and the far-future period (2070–2099) to identify changes. The results showed that there were changes in extreme precipitation in Indonesia both in intensity and frequency of occurrence. Extreme precipitation with a 5-year return period in Indonesia generally has a change value in the range of − 5 to + 25% with most areas likely to increase. The increased value reaches + 20% in the near-future period and + 40% in the far-future period. For the frequency of extreme precipitation above the 5-year return period in Indonesia, the change value is generally in the range of − 40 to + 120% with most areas likely to increase. The increased value reaches + 160% in the near-future period and + 200% in the far-future period. In the higher emission scenario (SSP5-8.5), the areas with higher values of increase will expand both in the change in intensity and frequency of occurrence. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Climate change

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