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Effects of disturbance modes and carbon sources on the physiological traits and nutrient removal performance of microalgae (S. obliquus) for treating low C/N ratio wastewater

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Chemosphere 2024年 347卷 140672页

作者： Zhao, Xin Lu, Shaoyong Guo, Xiaochun Wang, Ruigang Li, Ming Fan, Chunzhen Wu, Haiming State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China College of Water Sciences Beijing Normal University Beijing100875 China Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science & Engineering Shandong University Qingdao266237 China Shanxi Laboratory for Yellow River College of Environmental and Resource Sciences Shanxi University Taiyuan030006 China College of Resources and Environment Northwest A&F University Shaanxi Yangling712100 China National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution Key Laboratory of Zhejiang Province for Water Environment and Marine Biological Resources Protection College of Life and Environmental Science Wenzhou University Wenzhou325000 China

Wastewater treatment with microalgae is an ecologically sustainable process. In this study, the growth characteristics, nutrient removal, and spectral changes of dissolved organic matter (DOM) in microalgae bioreactors were investigated for treating low C/N ratio wastewater under different disturbance modes (agitation and aeration) and carbon sources (sucrose and humic acid). The results showed that the biomass and chlorophyll-a contents of Scenedesmus obliquus in the aeration condition (725.32–811.16 × 104 cells mL−1, 1.58–1.69 mg L−1) were higher than those in the agitation condition (426.06–465.14 × 104 cells mL−1, 1.48–1.61 mg L−1). The better removal of nutrients (TN, 29.62–36.39 mg L−1, TP, 1.84–2.30 mg L−1) by microalgae in sucrose-containing wastewater under agitation conditions occurred on the second day, with removal efficiencies of 21.33–30.67% and 44.84–58.51%, respectively;while it was on the fifth day both in sucrose and humic acid-containing wastewater under aeration conditions (TN, 19.56–31.20 mg L−1, TP, 0.26–0.30 mg L−1), with removal efficiencies of 13.92–46.75% and 88.36–90.50%, respectively. The wastewater DOM primarily consisted of humic-like substances under agitation and aeration conditions characterized by high levels of aromaticity, molecular weight and humification. Furthermore, the aromatization and humification properties of DOM in humic acid wastewater were higher than those in sucrose wastewater, which was corresponding with the lower removal and availability of pollutants by algae. Microalgae showed good biomass accumulation and nutrients removal at incubation time of 2 days (agitation condition) and 5 days (aeration condition), respectively. Consequently, a technical reference is provided for the microalgae coupled with other treatment processes. © 2023 Elsevier Ltd

关键词： Microalgae

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The complete mitochondrial genome ofSargassum kjellmanianum(Sargassaceae) and phylogenetic analysis ofSargassum kjellmanianum(Sargassaceae)

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Mitochondrial DNA Part B 2022年第10期7卷 1785-1786页

作者： Hui Xu Xixi Wang Liping Zhang Yingying He Yuanyuan Zhang Changfeng Qu Jinlai Miao a College of Chemical Engineering Qingdao University of Science and Technology Qingdao PR Chinab Key Laboratory of Marine Eco-Environmental Science and Technology First Institute of Oceanography Ministry of Natural Resource Qingdao PR China b Key Laboratory of Marine Eco-Environmental Science and Technology First Institute of Oceanography Ministry of Natural Resource Qingdao PR China a College of Chemical Engineering Qingdao University of Science and Technology Qingdao PR China b Key Laboratory of Marine Eco-Environmental Science and Technology First Institute of Oceanography Ministry of Natural Resource Qingdao PR Chinac Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology Qingdao PR Chinad Marine Natural Products R&D Laboratory Qingdao Key Laboratory Qingdao PR China

Sargassum kjellmanianumplays an important role in marine ecosystem and biological resource utilization. Here, we analyzed the characteristics and evolution of mitochondrial genome ofS. kjellmanianumby paired-end sequencing. The complete mitogenome comprises a circular DNA molecule measuring 34,723 bp in length with 35 coding genes. The circular genome consisted of seven protein-coding genes, 25tRNAgenes, and threerRNAgenes, with a total length of 26,553 bp. The overall A + T content was 63.43%, higher than the G + C content (36.57%). Phylogenetic analysis confirmedS. kjellmanianumwas closely clustered withS. muticum.

关键词： Sargassum kjellmanianum mitochondrial genome phylogenetic analysis

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Comparably Effective Elimination of Several Antibiotics from Water: Elastic Complementarity between Radical and Non-Radical Active Species in Catalytic Systems

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SSRN 2024年

作者： Yuan, Mingyao Li, Fang Xiang, Tao Zeng, Zhenxing Peng, Hong Xiao, Hong Lu, Xiaohui Zhang, Yanzong Deng, Shihuai Zhang, Guangshan Xu, Peng Shen, Tianyao Dang, Xueming Wang, Xiaojing School of Environment Sichuan Agricultural University Chengdu610000 China College of Resource and Environment Qingdao Engineering Research Center for Rural Environment Qingdao Agricultural University Qingdao266109 China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150090 China Key Laboratory of Industrial Ecology and Environmental Engineering Ministry of Education School of Environmental Science and Technology Dalian University of Technology Dalian116024 China

Faced with the challenges of water pollution caused by the abuse of antibiotics, the comparably efficient degradation for diverse antibiotics was achieved through an elastic complementarity among SO4•-, •OH and 1O2 in a layered double hydroxides (LDH)+peroxymonosulfate (PMS) system. The catalytic system was able to maintain excellent performance even in the complicated water environment. The activation process was realized by transferring electrons from Co and Fe sites to the antibonding orbit of the O-O bond in the adsorbed HSO5-. Co sites might dominate by virtue of a stronger adsorption energy. Furthermore, the activation performance was probably enhanced by the charge transfer between the Co and Fe sites. Notably, the potential intermediates' significantly lower biotoxicity may make it easier to process conventional treatment methods further in practical applications. The objective of this study was to enrich the mechanistic knowledge of PMS activation at the micro level and provide a promising alternative for the reduction of refractory organic contaminants in water. © 2024, The Authors. All rights reserved.

关键词： Antibiotics

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Occurrence,evolution and degradation of heavy haze events in Beijing traced by iodine-127 and iodine-129 in aerosols

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Chinese Chemical Letters 2022年第7期33卷 3507-3515页

作者： Miao Fang Xue Zhao Yixuan Liu Yang Shao Ning Chen Min Luo Luyuan Zhang Qi Liu Lingling Ma Diandou Xu Xiaolin Hou State Key Laboratory of Loess and Quaternary Geology Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and ApplicationXi'an AMS CenterInstitute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Department of Environmental Engineering Technical University of DenmarkRisøCampusRoskilde 4000Denmark Xi'an Institute for Innovative Earth Environment Research Xi'an 710061China CAS Center for Excellence in Quaternary Science and Global Change Xi'an 710061China Open Studio for Oceanic-Continental Climate and Environment Changes Pilot National Laboratory for Marine Science and Technology(Qingdao)Qiangdao 266061China University of Chinese Academy of Sciences Beijing 100049China

Heavy haze events have become a serious environment and health problem in China and many developing countries,especially in big cities,like ***,the factors and processes triggered the formation of secondary particles from the gaseous pollutants are still not clear,and the processes driving evolution and degradation of heavy haze events are not well *** isotopes(127Ⅰand129Ⅰ)as tracers were analyzed in time series aerosol samples collected from *** was observed that the127Ⅰconcentrations in aerosols peaked during the heavy haze *** conversion of gaseous iodine to particular iodine oxides through photochemical reactions provides primary nuclei in nucleation and formation of secondary air particles,which was strengthened as the external iodine input from the fossil fuel burning in the south/southeast industrial cities and consequentially induced heavy haze *** ^(129)Ⅰconcentrations peaked during clean air conditions and showed high levels in spring and later autumn compared to that in summer.^(129)Ⅰoriginated from the direct air discharges and re-emissions from contaminated seawaters by the European nuclear fuel reprocessing plants was transported to Beijing by the interaction of Westerlies and East Asian winter *** types of mechanisms were found in the formation and evolution of heavy haze events in Beijing by the variation of ^(127)Ⅰand ^(129)Ⅰ,i.e.,iodine oxides intermediated secondary air particles,dust storm and mixed mode by both secondary air particles and dust storm induced processes.

关键词： Haze Iodine isotopes Aerosol Primary nuclei Secondary air particles Formation mechanism of particles

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Design and Analysis of Kresling Origami-Inspired Reconfigurable Intelligent Dynamic Shading System

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SSRN 2024年

作者： Zhang, Ji Gao, Tianyu Liu, Shuai Mi, Yueying Liu, Jiatong Wang, Changguo School of Civil Engineering and Mechanics Yanshan University Qinhuangdao066004 China Hebei Key Laboratory of Mechanical Reliability for Heavy Equipments and Large Structures Yanshan University Qinhuangdao066004 China School of Mechanical Engineering Yanshan University Qinhuangdao066004 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Center for Composite Materials and Structures Harbin Institute of Technology Harbin150001 China

This work presents a reconfigurable intelligent dynamic shading system based on the Kresling origami structure, and conducts mechanical analysis and photothermal coupling research. Initially, unit cell of intelligent system is created by incorporating a fan blade unit with adjustable ventilation into the upper section of the Kresling origami structure. The reconfigurable intelligent dynamic shading system is formed by arranging the unit cells based on the concept of kirigami. The crease portion utilizes Shape Memory Polymer (SMP) polymers to enable the structure to intelligently fold and unfold. Simultaneously, Carbon Fiber Reinforced Polymer (CFRP) is employed in the panel components to guarantee the robustness and steadiness of the framework. Subsequently, a mechanical model was formulated and the mechanical mechanism governing the evolution of its configuration was derived using the principle of minimum potential energy. Additionally, 4D printing was conducted, where specimens were manufactured and subjected to compression testing and simulations. The results shown strong concurrence with the theoretical predictions, so enabling the characterization of the mechanical properties of intelligent dynamic shading system. Research on the flow field characteristics of the system demonstrates the favorable attributes of this technology in intelligent ventilation. Ultimately, the investigation of the system's photothermal coupling demonstrated the discerning influence of structural photothermal factors. Through the implementation of a mathematical model, the intelligent system has the capability to autonomously adapt the shade angle in response to dynamic environmental variations, thereby enhancing the illumination and thermal conditions within the building. This system offers superior control over light and heat flow compared to conventional permanent shade facilities. It effectively reduces energy consumption and greatly enhances the comfort of living and working enviro

关键词： Dynamics

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Design and Bandgap Tuning of Kresling Origami-Inspired Metamaterials

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SSRN 2024年

作者： Zhang, Ji Gao, Tianyu Wang, Changguo School of Civil Engineering and Mechanics Yanshan University Qinhuangdao066004 China Hebei Key Laboratory of Mechanical Reliability for Heavy Equipments and Large Structures Yanshan University Qinhuangdao066004 China School of Mechanical Engineering Yanshan University Qinhuangdao066004 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Center for Composite Materials and Structures Harbin Institute of Technology Harbin150001 China

In this study, a resonant system based on Kresling origami was designed, utilizing the unique geometric properties of the structure to achieve bandwidth tuning for effective vibration control. Finite element analysis was employed to systematically investigate how variations in folding angles, the number of layers, and overall structural symmetry affect the system’s vibration bandgap characteristics. The analysis revealed that significant vibration bandgaps in the low-frequency range, specifically between 60 Hz and 150 Hz, could be achieved through careful adjustments to the Kresling origami configuration. By manipulating the folding patterns and geometric parameters, the structure was able to suppress vibrations within specific frequency ranges, providing a precise and adaptable approach to vibration isolation. This method eliminates the need for additional materials or complex mechanical systems, significantly simplifying the design and fabrication process while enhancing flexibility. Moreover, the inherent adaptability of Kresling origami structures was demonstrated, showing that the design could be extended beyond spiral bases to incorporate a wide variety of origami forms, further broadening its application potential. These findings demonstrate the practical viability of Kresling origami-based systems in real-world engineering, especially in environments requiring efficient and customizable vibration and noise reduction. The study highlights the structure’s potential in industries such as aerospace, automotive, and civil engineering, where adaptable vibration control is crucial under challenging conditions. © 2024, The Authors. All rights reserved.

关键词： Vibration analysis

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Algal toxicity induced by effluents from textiledyeing wastewater treatment plants

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Journal of environmental sciences 2020年第5期32卷 199-208页

作者： Hualing Cai Jieying Liang Xun-an Ning Xiaojun Lai Yang Li School of Environmental Science and Engineering Guangdong University of TechnologyGuangzhou 510006China School of Chemical Engineering The University of New South WalesSydneyN S W 2052Australia Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Institute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China

This research aimed to evaluate the alga Scenedesmus obliquus toxicity induced by textiledyeing effluents(TDE).The toxicity indicator of TDE in alga at the physiological(algal growyth),biochemical(chlorophyll-a(Chl-a)synthesis and superoxide dismutase(SOD)activity)and structural(cell membrane integrity)level were *** we further study the relationship among toxicity indicators at physiological and biochemical level,and supplemented by research on algal *** to the analysis of various endpoints of the alga,the general sensitivity sequence of toxicity endpoints of Scenedesmus obliquus was:SOD activity>Chl-a synthesis>algal *** stimulation rate of SOD activity increased from day 3(57.25%~83.02%)to day 6(57.25%~103.81%),and then decreased on day 15(-4.23%^-32.96%),which indicated that the antioxidant balance system of the algal cells was *** rate of Chl-a synthesis inhibition increased gradually,reaching19.70%~79.39%on day 15,while the rate of growth inhibition increased from day 3(-12.90%~10.16%)to day 15(-21.27%~72.46%).Moreover,the algal growth inhibition rate was positively correlated with the inhibition rate of SOD activity or Chl-a synthesis,with the correlation coefficients were 0.6713 and 0.5217,*** cells would be stimulating to produce excessive reactive oxygen species,which would cause peroxidation in the cells,thereby destroying chloroplasts,inhibiting chlorophyll synthesis and reducing *** increasing exposure time,irreversible damage to algae can lead to *** study is expected to enhance our understanding of the ecological risks through algal tests caused by TDE.

关键词： Textile-dyeing effluent Ecotoxicity Alga Dissolved organic matter Lipid peroxidation Metabolic activation

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Novel Dopamine-Derived Carbon Modified Fe-Based Metal-Organic Framework Enhanced Aptasensor Rendering Ultrasensitive Electrochemical Detection of Oxytetracycline

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SSRN 2024年

作者： Song, Jialing Fan, Xiaoxuan Ee, Liang Ying Lin, Xuanhao Li, Sam Fong Yau Huang, Manhong Singapore Donghua University China Shanghai University College of Science Department of Chemistry International Joint Laboratory Catalyst Chemistry Shanghai200444 China College of Environmental Science and Engineering State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry Donghua University Shanghai201620 China National University of Singapore Department of Chemistry 3 Science Drive 3 Singapore117543 Singapore Advanced Membranes and Porous Materials Center Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia Chemical Engineering Program Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia National University of Singapore Environmental Research Institute T Lab Building 5A Engineering Drive 1 Singapore117411 Singapore

In the present work, an aptasensor with dual binding sites based on Au NPs modified with self-polymerized polydopamine (PDA) and Fe-MOF is successfully constructed. In terms of standard electron transfer, the cyclic voltammetry (CV) analysis showcases a rate constant (ks) of 96.0 s-1, signifying an exceptional electron transfer rate of oxytetracycline at the sensor interface of Apt/Au@PDA@NH2-MIL-101(Fe)/GCE. Further deepening the investigation into electrochemical kinetics using chronoamperometry (CA), we investigated the electrocatalytic parameters (Kcat) of Au@PDA@NH2-MIL-101(Fe) in relation to oxytetracycline. The results divulged an impressive average Kcat value of 3.06×105 M-1 S-1. This evidence robustly suggests the superior electrocatalytic activity of Au@PDA@NH2-MIL-101(Fe) when it comes to oxytetracycline oxidation. A custom-designed portable rapid detection platform was developed, achieving detection limits of 6.88 nM under static water flow conditions and 5.56 nM under dynamic conditions. Remarkably, the self-polymerization of PDA on Au NPs not only refines their size but also boosts their interaction with biomolecules, thereby promising excellent biocompatibility. Moreover, the abundance of -COOH groups and unsaturated Fe3+ sites on the NH2-MIL-101(Fe) surface furnishes a considerable number of grafting sites for the aptamer. More importantly, the redox interplay between Au@PDA and NH2-MIL-101(Fe) accelerates electron movement, thus amplifying the electrochemical signal and the detection sensitivity for oxytetracycline. © 2024, The Authors. All rights reserved.

关键词： Rate constants

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Carbon Nanofiber/Graphene Hybrids Anchoring Fe, N, S Heteroatoms Simultaneously Enhancing Extracellular Electron Transfer and Biofilm Adhesion in Microbial Fuel Cells

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SSRN 2023年

作者： Ren, Tingli Liu, Yuanfeng Lin, Xiaoqiu Li, Congju School of Energy and Environmental Engineering University of Science and Technology Beijing Beijing100083 China Beijing Key Laboratory of Resource-oriented Treatment of Industrial pollutants Beijing100083 China

The fairly low power density, mainly resulting from poor electroactive bacteria (EAB) adhesion and the sluggish extracellular electron transfer (EET) at the anode interface, constrains the practical implementation of microbial fuel cells (MFCs). Therefore, the properties of the anode material are considered to be a crucial factor for the long-term operational performance of MFCs. In order to enhance the power production performance of MFCs, aerogel composed of Fe, N, S co-doped carbon nanofibers (CNFs) and reduced graphene oxide (rGO) was employed as a high-performance anode material by electrospinning, high-temperature pyrolysis and freeze-drying. The doping of Fe, N and S elements induced the formation of abundant reactive sites on the CNFs, which enhanced the electrochemical performance of the anode and the EET process. And the huge electroactive area of the samples facilitated the formation of dense biofilms. Therefore, MFC with the FeS/Fe3C@NCNFs/rGO-modified anode achieved a maximum power density of 2792.56 mW m−2 and the highest output voltage of 0.658 V, both of which were significantly higher than that of the carbon cloth anode (773.97 mW m−2 and 0.443 V). Considering the great improvement of power production, it has considerable potential as a low-cost but high-performance anode material for MFCs. © 2023, The Authors. All rights reserved.

关键词： Electrospinning

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The Evolution of Metabolic Mechanisms and Insights into the Inherent Bottleneck in a Simultaneous Autotrophic/Heterotrophic Anammox System for Nitrogen Removal from Real Municipal Wastewater

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SSRN 2024年

作者： Zhou, Li Zhang, Xingxing Zhang, Xiaonong Al-Dhabi, Naif Abdullah Tang, Wangwang Liu, Wenru Wu, Peng National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology Jiangsu Collaborative Innovation Center of Technology Material of Water Treatment School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou215009 China Department of Botany and Microbiology College of Science King Saud University P. O. Box 2455 Riyadh11451 Saudi Arabia School of Ecological and Environmental Sciences East China Normal University Shanghai200241 China Hunan University Changsha410082 China

When biological nitrogen removal (BNR) systems shifted from treating simulated wastewater to real wastewater, a microbial succession occurred, often resulting in a decline in efficacy. Notably, despite their high nitrogen removal efficiency for real wastewater, anammox coupled systems operating without or with minimal carbon sources also exhibited a certain degree of performance reduction. The underlying reasons and metabolic shifts within these systems remained elusive. In this study, the simultaneous autotrophic/heterotrophic anammox system demonstrated remarkable metabolic resilience upon exposure to real municipal wastewater, achieving a nitrogen removal efficiency (NRE) of 82.83 ± 2.29%. This resilience was attributed to the successful microbial succession and the complementary metabolic functions of heterotrophic microorganisms, which fostered a resilient microbial community. The system's ability to harness multiple electron sources, including NADH oxidation, the TCA cycle, and organics metabolism, allowed it to establish a stable and efficient electron transfer chain, ensuring effective nitrogen removal. Despite the denitrification channel's nitrite supply capability, the analysis of the interspecies correlation network revealed that the synergistic metabolism between AOB and AnAOB was not fully restored, resulting in selective functional bacterial and genetic interactions and the system's PN/A performance declined. Additionally, the enhanced electron affinity of PD increased interconversion of NO3-N and NO2-N, limiting the efficient utilization of electrons and thereby constraining nitrogen removal performance. This study elucidated the metabolic mechanism of nitrogen removal limitations in anammox-based systems treating real municipal wastewater, enhancing our understanding of the metabolic functions and electron transfer within the symbiotic bacterial community. © 2024, The Authors. All rights reserved.

关键词： Denitrification

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