检索结果-内蒙古大学图书馆

Mixotrophic Chlorella pyrenoidosa biofilm with enhanced biomass production, microalgal activity, and nutrient removal from nutrient-rich wastewater

引用

Journal of environmental Sciences (China) 2025年 157卷 366-377页

作者： Wu, Xiongwei Jin, Cong Zhang, Chiqian Li, Ping Huang, Jim Junhui Wu, Jing Wu, Jinhua Hu, Zhiqiang School of Environment and Energy South China University of Technology Guangzhou510006 China Zhongshan Institute of Modern Industrial Technology of South China University of Technology Zhongshan528400 China Civil Engineering Program College of Engineering & Computer Science Arkansas State University JonesboroAR72467 United States Environmental Research Institute National University of Singapore Singapore117411 Singapore Department of Civil and Environmental Engineering University of Missouri-Columbia 65211 United States

Microalgae possess significant advantages in nitrogen and phosphorus removal from nutrient-rich wastewater that are highly efficient and independent of the C/N ratio. However, challenges such as low biomass productivity, high variability in nutrient removal under different trophic types, and difficulty in harvesting biomass limits the large-scale application of microalgae wastewater treatment. This study attempted to employ mixotrophic microalgae biofilm to address these issues. The biomass production, microalgal activity, and nutrient removal of Chlorella pyrenoidosa biofilms with different trophic types were compared for nutrient-rich wastewater treatment. The results showed that the biomass productivity of the mixotrophic microalgal biofilm (0.215 g/(L·d)) was 2.3, 8.6, and 6.0 times higher than that of photoautotrophic microalgal biofilm, heterotrophic microalgal biofilm, and photoautotrophic suspended microalga, respectively. Additionally, the dehydrogenase activity (DHA), indicating microalgal activity, of the mixotrophic biofilm was 2.3 and 16.5 times higher than that of photoautotrophic and heterotrophic biofilms, respectively. Meanwhile, the mixotrophic biofilm removed 96.0 % of NH4+-N and 99.2 % of PO43–-P, more efficient than that with other types of biofilms and suspended microalgae. In an open-ended air-lift photobioreactor, the mixotrophic microalgal biofilm produced biomass at 0.12 g/(L·d) and removed 90.0 % of NH4+-N and 97.6 % of PO43–-P. This study suggests that the mixotrophic microalgal biofilm shows promise in treating nutrient-rich wastewater and producing microalgal biomass for value-added products. © 2024

关键词： Microalgae

来源：评论

学校读者我要写书评

暂无评论

Partitioning Uncertainty from Climate Change Inputs on Streamflow Projections in the Bicol River Basin, Philippines

SSRN

引用

SSRN 2025年

作者： Bañares, Ernie Nograles Mehboob, Muhammad Shafqat Panda, Manas Ranjan Engineering Graduate Program School of Engineering University of San Carlos Cebu City6000 Philippines College of Engineering and Architecture Sorsogon State University Sorsogon City4700 Philippines Department of Civil Engineering School of Engineering University of San Carlos Cebu City6000 Philippines Department of Civil & Environmental Engineering Yonsei University Seoul Korea Republic of

Increasing threats to global water resources from climate change emphasize the importance of comprehending its impacts on hydrology for effective water management. This article quantifies climate input uncertainty in streamflow projections for the Libmanan-Pulantuna Watershed (LPW) in the Bicol River Basin, Philippines. Using the Water Evaluation and Planning (WEAP) model, we simulated streamflow based on future climate projections (FCPs) from Intergovernmental Panel on Climate Change (IPCC) greenhouse-gas emission scenarios, utilizing Coupled Model Intercomparison Project phases 5 (CMIP5) and 6 (CMIP6) datasets. Four Global Circulation Models (GCMs) and three bias correction techniques (Linear Scaling, Quantile Mapping, and Detrended Quantile Mapping) were applied. Results showed significant differences between the CMIP datasets, with raw CMIP6 better capturing historical climate patterns. Bias correction methods reduced projection biases in precipitation and air temperatures. Projections revealed increasing low flows and decreasing high flows, especially under high-emission scenarios, worsening water shortages during critical periods. Analysis of Variance (ANOVA) showed that climate models were a major source of uncertainty in hydrological projections. Combined FCPs and GCMs contributed to 50%-75% of total uncertainty across flow percentiles and future periods (near-future, mid-future, far-future). These findings underscore the importance of careful model selection and effective bias correction for reliable hydrological projections, crucial for water management strategies in areas like the Bicol River Basin, where water resources are essential for communities and ecosystems. © 2025, The Authors. All rights reserved.

关键词： Rivers

来源：评论

学校读者我要写书评

暂无评论

Microbial Communities in Coastal Salt Marshes Along the Southeast Coast of China and their Effects on Carbon Storage

引用

Current Analytical Chemistry 2025年

作者： Lv, Chunguang Li, Yan Zhang, Huining Wang, Chenyi Ren, Min Zhang, Chiqian Zhejiang Wanli University College of Biological & Environmental Sciences 315000 China NingboTech University School of Civil Engineering 315000 China Marine Environmental Monitoring Centre of Ningbo 315100 China Civil Engineering Program College of Engineering & Computer Science Arkansas State University 72467 AR United States

Background: Wetlands are vital carbon sinks, with coastal salt marshes being particularly effective in carbon sequestration. Understanding how different vegetation types influence soil carbon storage and microbial composition can enhance our knowledge of these ecosystems’ roles in global carbon cycling. Methods: This study investigates soil physicochemical properties, soil carbon storage, and microbial community composition and diversity at three depths (10, 30, and 60 cm) in five salt marsh plots from five coastal salt marshes: Bare flat (a non-vegetated marsh) and plots dominated by Imperata cylindrica, Solidago canadensis, Suaeda spp., and Phragmites australis. Carbon storage was evaluated by measuring soil organic carbon (SOC) content. At the same time, high-throughput sequencing was employed to analyze microbial communities, aiming to elucidate their relationships with soil carbon storage and wetland vegetation. Results: The average SOC contents in the five plots were in the order of S. canadensis (13.33 g·kg^–1) > Bare flat (11.45 g·kg^–1) > Suaeda spp. (8.10 g·kg^–1) > I. cylindrica (6.15 g·kg^–1) > P. australis (5.80 g·kg^–1). S. canadensis and Bare flat marshes had the highest carbon content, which is mainly attributed to the presence of the most abundant carbon-fixation microbes, Fulvivirgaceae (family) and Acidobacteria RB41 (genus), in the soil of these two plots. Both organic and dissolved organic carbon contents at 10 cm were higher than those at the other two depths for all five marshes. Conclusion: The Bare flat exhibited strong carbon sequestration capability, second only to the invasive S. canadensis plot among the five plots surveyed. It also showed the highest microbial abundance and the greatest number of carbon-sequestration-related functional genes. The S. canadensis plot exhibited the lowest microbial community diversity and abundance despite having the highest carbon storage capacity. As an i

关键词： carbon content carbon fixation carbon storage Coastal salt marsh invasive vegetation microbial community

来源：评论

学校读者我要写书评

暂无评论

Sorptive removal of neonicotinoid pesticides by nanobiochars: Efficiency, kinetics, and reusability

引用

Journal of Hazardous Materials 2025年 493卷

作者： Radwan, Islam M. Wang, Chongyang Kim, Jae-Hong Wei, Haoran Wang, Dengjun Department of Agricultural and Biological Engineering University of Florida GainesvilleFL32611 United States Department of Chemical and Environmental Engineering Yale University New HavenCT06511 United States Environmental Chemistry and Technology Program University of Wisconsin−Madison 660 N. Park Street MadisonWI53706 United States Department of Civil and Environmental Engineering University of Wisconsin−Madison 1415 Engineering Drive MadisonWI53706 United States

The widespread use of neonicotinoid (NEO) pesticides has raised significant environmental concerns due to their toxicity. We investigated the performance of 16 nanobiochars (NBCs), including NBC produced by Douglas fir at 900 °C (Doug 900 NBC), as sustainable sorbents for removing three common NEOs from aqueous solutions: imidacloprid, clothianidin, and thiamethoxam. The NBCs showed high sorption efficiency (∼ 100 %) and fast sorption kinetics ( © 2025 Elsevier B.V.

关键词： Reusability

来源：评论

学校读者我要写书评

暂无评论

A Comparative Study of the Structural Response of Conventional Residential Buildings and Simple Healthy Instant Houses under Cianjur Earthquake Loads 8

A Comparative Study of the Structural Response of Convention...

引用

8th International Conference on engineering and Applied Science, ICEAT 2024

作者： Faizah, R. Fauzan, N. Monika, F. Rizqi, A. Civil Engineering Study Program Universitas Muhammadiyah Yogyakarta Bantul Indonesia Environmental Disaster and Geospatial Study Center Universitas Muhammadiyah Yogyakarta Bantul Indonesia East Jakarta City Indonesia

Earthquakes frequently cause significant damage to residential buildings and lead to loss of life. As a result, houses in earthquake-prone areas must adhere to earthquake-resistant building codes. Recently, RISHA (Simple Healthy Instant House), developed by PUSKIM (Center for Settlement Research and Housing Development), has been commonly implemented as housing in areas impacted by earthquakes, including East Nusa Tenggara, West Nusa Tenggara, Aceh, and Cianjur Regency, RISHA homes have been provided to residents in relocation areas. This study aims to assess the viability of using RISHA as a replacement for conventional houses in Cianjur Regency. The analysis predicts the structural response of RISHA and conventional houses to the Cianjur earthquake, using the spectrum response method based on SNI 1726:2019. Using SAP2000 software, the study evaluates deflection, bending moment, and base shear force. The findings indicate that RISHA exhibits lower deflection, bending moment, and shear force compared to conventional houses, with values being 12.5%, 65%, and 66.5% of those in traditional houses, respectively. Based on these results, it is concluded that RISHA offers superior structural performance in resisting earthquakes compared to conventional residential buildings. © Published under licence by IOP Publishing Ltd.

关键词： Houses

来源：评论

学校读者我要写书评

暂无评论

How extreme rainfall and failing dams unleashed the Derna flood disaster

引用

Nature Communications 2025年第1期16卷 1-12页

作者： Nemnem, Ayman Mokhtar Tanim, Ahad Hasan Nahian, Audrika Khan, Sadik Goharian, Erfan Imran, Jasim Department of Civil and Environmental Engineering University of South Carolina Columbia SC United States Environmental Sciences Division Oak Ridge National Laboratory (ORNL) Oak Ridge TN United States Civil and Environmental Engineering Jackson State University Jackson MS United States Program Manager RESPEC San Diego CA United States

On September 11, 2023, Storm Daniel unleashed unprecedented rainfall over the Wadi Derna watershed, triggering one of the most devastating floods in modern history, striking Derna, a coastal city in Libya. This study reconstructs the disaster using an integrated modeling approach that combines satellite imagery, hydrologic, hydraulic, and geotechnical simulations, machine learning, eyewitness accounts, and digital elevation data to assess the impact of cascading dam failures. Our findings reveal that the region’s dams, even if structurally sound, would have provided minimal protection against the extreme runoff. However, their failure unleashed a destructive surge wave, amplifying the disaster’s magnitude and devastation. Here, we show that the collapse of aging flood control infrastructures, compounded by inadequate risk assessment and emergency preparedness, dramatically escalated the disaster’s impact. Our findings underscore the urgent need for systematic dam safety evaluations, enhanced flood forecasting, and adaptive risk management strategies that address climate extremes and infrastructure vulnerabilities. © The Author(s) 2025.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Sustainable Stabilization of Sandy Soils Using Steel Slag and Biopolymer Cellulose

SSRN

引用

SSRN 2025年

作者： Mugula, Julius Nakayenga, Joyce Kido, Ryunosuke GuhaRay, Anasua Hata, Toshiro Civil and Environmental Engineering Program Hiroshima University 1-4-1 Kagamiyama Higashi Hiroshima Hiroshima City739-8527 Japan Department of Civil Engineering BITS Pilani Hyderabad Campus Jawahar Nagar Kapra Mandal Telangana Secunderabad500078 India Hiroshima University Japan

Steel slag, a by-product of the steel-making industry, offers potential for soil stabilization but remains underutilized in sandy soils due to challenges such as slow strength development, low water retention, particle segregation, and bleeding. Cellulose, a plant-based biopolymer, enhances soil water retention and may improve the performance of steel slag-treated *** study investigated the stabilization of Masado granite and Toyoura silica sands using steel slag and two forms of unhydrolyzed cellulose: cellulose powder (CP) and carboxymethyl cellulose (CMC). Sands were treated with steel slag at varying contents (0%, 10%, 15%, 30%, and 50%) to identify the optimal dosage and the most suitable sand based on unconfined compressive strength (UCS) and pozzolanic reactivity over 3, 7, 14, and 28 days. CP and CMC were added at 0%, 0.25%, 0.5%, 0.75%, and 1% to evaluate their effects on the UCS, flowability, compaction, mineralogy, and microstructure. The findings established 30% steel slag as the optimal dosage, enhancing UCS by 99.05%. Masado granite sand exhibited the highest UCS (558.85 kPa), outperforming Toyoura silica sand (34 kPa) due to better pozzolanic reactivity. Incorporating 0.5% cellulose further improved strength, with CMC and CP increasing UCS by 53.29% and 49.23%, respectively, through gel thread and fibrous network formation. These optimized composites reduced cement-related carbon emissions by 2.5% per kilometer of highway embankments, demonstrating their viability as sustainable and eco-friendly construction materials. © 2025, The Authors. All rights reserved.

关键词： Silica sand

来源：评论

学校读者我要写书评

暂无评论

Nucleation effects of coccoliths in portland cement

引用

Matter 2025年

作者： Beatty, Danielle N. Srubar, Wil V. Materials Science and Engineering Program University of Colorado Boulder 4001 Discovery Drive UCB 027 BoulderCO80303 United States Department of Civil Environmental and Architectural Engineering University of Colorado Boulder 1111 Engineering Drive ECOT 441 UCB 428 BoulderCO80309 United States

This work explores the use of photosynthesized coccoliths (intricate CaCO3 particles) as a nucleation agent or cement replacement in portland cement paste. First, coccoliths were produced and harvested from the marine microalgae Emiliania huxleyi and the particle size, morphology, and mineralogy were characterized. Then, the nucleation effects of E. huxleyi coccoliths as seeding agent (0.5, 1, 3, or 5 wt % additions) and limestone filler (5 and 15 wt % cement replacements) were studied using isothermal conduction calorimetry and compressive strength testing. The results were compared with five commercially available CaCO3 sources used as nucleation agents and fillers. While the high surface area of coccoliths (12.22 m2/g) enhanced water demand, it also enhanced nucleation during cement hydration without accelerating hydration, leading to enhanced early-age strength without detriments to 28-day strength. Results highlight a potential carbon reduction strategy, namely employing photosynthesis as a method of mineral admixture production, for the cement and concrete industry. © 2025 Elsevier Inc.

关键词： Portland cement

来源：评论

学校读者我要写书评

暂无评论

GPU Implementation of a Gas-Phase Chemistry Solver in the CMAQ Chemical Transport Model

ACS ES&T air

引用

ACS ES&T air 2025年第2期2卷 226-235页

作者： Duncan Quevedo Khanh Do George Delic José Rodríguez-Borbón Bryan M Wong Cesunica E Ivey Department of Civil and Environmental Engineering University of California Berkeley California 94720 United States. Department of Chemical and Environmental Engineering University of California Riverside California 92557 United States. Center for Environmental Research and Technology Riverside California 92507 United States. Hiperism Consulting LLC Chapel Hill North Carolina 27514 United States. Department of Chemistry Department of Physics & Astronomy and Material Science & Engineering Program University of California Riverside California 92557 United States.

The Community Multiscale Air Quality (CMAQ) model simulates atmospheric phenomena, including advection, diffusion, gas-phase chemistry, aerosol physics and chemistry, and cloud processes. Gas-phase chemistry is often a major computational bottleneck due to its representation as large systems of coupled nonlinear stiff differential equations. We leverage the parallel computational performance of graphics processing unit (GPU) hardware to accelerate the numerical integration of these systems in CMAQ's CHEM module. Our implementation, dubbed CMAQ-CUDA, in reference to its use in the Compute Unified Device Architecture (CUDA) general purpose GPU (GPGPU) computing solution, migrates CMAQ's Rosenbrock solver from Fortran to CUDA Fortran. CMAQ-CUDA accelerates the Rosenbrock solver such that simulations using the chemical mechanisms RACM2, CB6R5, and SAPRC07 require only 51%, 50%, or 35% as much time, respectively, as CMAQv5.4 to complete a chemistry time step. Our results demonstrate that CMAQ is amenable to GPU acceleration and highlight a novel Rosenbrock solver implementation for reducing the computational burden imposed by the CHEM module.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The fate of antibiotics during phosphate recovery processes - A critical review

引用

Science of the Total Environment 2025年 968卷 178829页

作者： Bolujoko, Nathaniel Duling, Addison Shashvatt, Utsav Mangalgiri, Kiranmayi Environmental Science Graduate Program Oklahoma State University 202 Whitehurst StillwaterOK74078 United States Department of Biosystems and Agricultural Engineering Oklahoma State University 215A Agricultural Hall StillwaterOK74078 United States Department of Civil and Environmental Engineering University of California Berkeley 760 Davis Hall BerkeleyCA94720 United States

The principles of circular economy encourage the recovery of phosphorus from nutrient-rich waste streams such as animal manure, domestic wastewater, and urine to supplement existing sources of raw phosphorus. However, these waste streams also contain a wide variety of contaminants of emerging concern including antibiotics, and the recovery of phosphorus from these waste streams results in the co-occurrence of antibiotics with the recovered phosphorus products. This paper provides a comprehensive overview of the fate of environmentally relevant antibiotics in three major existing and upcoming phosphorus recovery processes: precipitation-, membrane-, and adsorption-based treatment. In general, the co-occurrence of antibiotics in recovered phosphorus increases with the presence of dissolved organic matter (DOM) and cations due to π-π interaction and cationic bridge formation, respectively. Additionally, antibiotics display pH-based speciation resulting in electrostatic interactions with recovered phosphorus at pH > 7.0. Furthermore, this critical review establishes a new metric, the relative antibiotic-to‑phosphorus (RAP), defined as the ratio of the concentration of antibiotics to phosphorus in recovered phosphorus to that of the phosphorus-rich waste. Precipitation-based methods, particularly struvite, demonstrated the lowest RAP, while the RAP in carbon-based adsorbents was 1.8 × 108 times higher than in membrane-based processes. In reviewing literature on the fate of antibiotics in phosphorus recovery processes, several research needs are also highlighted: the fate of non-tetracycline antibiotics, simultaneous investigation of phosphorus and antibiotic fate in membrane- and adsorption-based methods, treatment methods to mitigate the co-occurrence of antibiotics in recovered phosphorus product, and the release of antibiotics from recovered phosphate products. © 2024

关键词： Rivers

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：