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Piezoelectric materials for pollutants degradation: State-of-the-art accomplishments and prospects

Chinese Chemical Letters 2024年第4期35卷 61-72页

作者： Yuqing Zhu Haohao Chen Li Wang Liqun Ye Houle Zhou Qintian Peng Huaiyong Zhu Yingping Huang College of Materials and Chemical engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002China engineering Research Center of Eco-environment in Three Gorges Reservoir Region Ministry of EducationChina Three Gorges UniversityYichang 443002China College of hydraulic&Environmental engineering China Three Gorges UniversityYichang 443002China School of Chemistry and Physics Queensland University of TechnologyBrisbaneQLD 4001Australia

Piezoelectric catalysis, a new catalytic method, is widely used in the field of environmental sanitation, including waste water treatment and dye degradation. However, in the face of the growing environmental pollution problem, the efficiency of piezoelectric catalysis is still hampered by the stress variation in the natural environment. Therefore, it is particularly important to improve the catalytic efficiency of piezoelectric materials. We divide piezoelectric materials into two categories: inorganic piezoelectric materials and organic piezoelectric materials. Then the mainstream inorganic piezoelectric materials are divided into four subcategories, namely:(1) MTiO_(3)(M = Ba, Sr),(2) bi-class catalytic materials,(3) MoX_(2)(X = S,Se), and(4) ZnO piezoelectric materials. The mainstream organic piezoelectric materials are divided into PVDF and g-C_(3)N_(4)materials. At the same time, the above materials are summarized to explain the excellent performance of materials from the perspective of structure and piezoelectric principle. In addition,we summarized the modification methods that can be applied to piezoelectric materials:(1) Morphology methods,(2) composites with heterojunctions, and(3) surface modification. Finally, we summarized the prospects of piezoelectric materials in the field of environment and water treatment.

关键词： Ultrasound Cavitation Piezoelectric materials Degradation Organic pollutants

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Effluent Zero Release Concept-The Brazilian Experience

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过程工程学报 2006年第4期6卷 691-696页

作者： José Carlos Mierzwa Sandra Mara Garcia Bello Ivanildo Hespanhol hydraulic and sanitation eng.dept. Univ.Sao PauloAv.Prof.Almeida Prado83 SoPauloBrazil CEP:05508-900 Navy Technologic Center in Sao Paulo Av.Prof.Lineu Prestes2468 SoPauloBrazilCEP:05508-900

Water scarcity is pushing the government,industries and researchers to the development of new strategies for water and wastewater *** approach aimed at the optimization of the water use and minimization of effluent generation was developed at the Centro Experimental ARAMAR(CEA),a nuclear research facility,located in the State of Sao Paulo,*** scale tests followed by a pilot plant treating effluents from some nuclear research facilities have shown the results leading to the conclusion that the effluent zero release concept is *** on the gathered data,a project of an integrated effluent treatment system focusing on water recovery and environmental effluent release reduction has been developed.

关键词： effluent wastewater treatment zero release

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hydraulic characteristics of an anaerobic baffled reactor as onsite wastewater treatment system

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Journal of Environmental Sciences 2010年第9期22卷 1319-1326页

作者： Yuttachai Sarathai Thammarat Koottatep Antoine Morel School of Environment Resources and Development Asian Institute of Technology Eawag:Swiss Federal Institute for Aquatic Science & Technology Department for Water and Sanitation in Developing Countries(Sandec)

The feasibility of using anaerobic baffled reactor （ABR） as onsite wastewater treatment system was discussed. The ABR consisted of one sedimentation chamber and three up-flow chambers in series was experimented under different peak flow factors （PFF of 1 to 6）, superficial gas velocities （between 0.6 and 3.1 cm/hr） and hydraulic retention times （HRT）（24, 36 and 48 hr）. Residence time distribution （RTD） analyses were carded out to investigate the hydraulic characteristics of the ABR. It was found that the PFF resulted in hydraulic dead space. The dead space did not exceed 13% at PFF of 1, 2 and 4 while there was 2-fold increase （26%） at PFF of 6. Superficial gas velocities did not result in more （biological） dead space. The mixing pattern of ABR tended to be a completely- mixed reactor when PFF increased. Superficial gas velocities did not affect mixing pattern. The effects of PFF on mixing pattern could be minimized by higher HRT （48 hr）. The tank-in-series （TIS） model （N = 4） was suitable to describe the hydraulic behaviour of the studied system. The HRT of 48 hr was able to maintain the mixing pattern under different flow patterns, introducing satisfactory hydraulic efficiency. Chemical oxygen demand （COD） and total suspended solids （TSS） removals under all flow patterns were achieved more than 85% and 90%, respectively. The standard deviation of effluent COD and TSS concentration did not exceed 15 mg/L.

关键词： anaerobic baffled reactor dead space hydraulic characteristics onsite system peak flow factor

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Evaluation of Dissolved Organic Carbon Using Synchronized Fluorescence Emission Spectra and Unsupervised Method of Principal Component Analysis (PCA) and Independent Component Analysis (ICA)

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Journal of Water Resource and Protection 2019年第3期11卷 244-279页

作者： Tais Cristina Filippe Luana Mayumi Takahasi Marques Heloise G. Knapik Júlio César Rodrigues de Azevedo Jorge Costa Pereira Department of Chemistry and Biology Federal University of Technology—Paraná Curitiba Brazil Department of hydraulic and sanitation Federal University of Technology—Paraná Curitiba Brazil Department of Chemistry University of Coimbra Coimbra Portugal

Dissolved organic matter (DOM) can be originated from autochthonous or allochthonous sources, where allochthonous DOM can be from pedogenic sources (humic substances—HSs) or anthropogenicsources (wastewater). The analysis of fluorescence emission, excitation, synchronous or excitation-emission matrix (EEM) have been used to identify the main source or probable contribution of dissolved compounds, such as humic acids (HA), fulvic acids (FA) and dissolved organic carbon (DOC) from sewage, but does not quantify. Fluorescence emission is a powerful technique to detect and qualify organic dissolved compounds but fails in quantitative aspects. In this work, we propose an in situ method for direct determination of DOC using synchronous fluorescence spectra with independent component analysis (ICA). Well known standard solutions were used for method development and validation. In this work, we show that it is possible to predict the number of independent contributions using an unsupervised method based on iterative Principal Component Analysis and Independent Component Analysis (PCA-ICA) approach over combined matrix results. Within these results it’s also possible to see that with a very small amount of independent components it is possible to describe environmental samples of HA, FA and primary productivity (PP).

关键词： Independent Component Analysis Dissolved Organic Carbon Spectra Deconvolution Synchronized Fluorescence

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The effect of coupling coagulation and flocculation with membrane filtration in water treatment:A review

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Journal of Environmental Sciences 2009年第1期21卷 8-12页

作者： TorOve Leiknes NTNU-Norwegian University of Science and Technology Department of Hydraulic and Environmental EngineeringS. P. Andersensvei 5N-7491 TrondheimNorway

Water supply and sanitation demands are foreseen to face enormous challenges over the coming decades to meet the fast growing needs in a global perspective. Significant growth in the industry is predicted and membrane separation technologies have been identified as one of the possible solutions to meet future demands. Application and implementation of membrane technology is expected both in production of potable water as well as in treatment of wastewater. In potable water production membranes are substituting conventional separation technologies due to the superior performance, potential for less chemical use and sludge production, as well as the potential to fulfill hygienic barrier requirements. Membrane bio-reactor （MBR） technology is probably the membrane process which has had most success and has the best prospects for the future in wastewater treatment. Trends and developments indicate that this technology is becoming accepted and is rapidly becoming the best available technology for many wastewater treatment applications. A major drawback of MBR systems is membrane fouling. Studies have shown that fouling mitigation in MBR systems can potentially be done by coupling coagulation and flocculation to the process.

关键词： coagulation and flocculation membrane filtration potable water wastewater

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Geometric Drawing Model of Shape of Water Sections for the Investigation of Solid Flow Transport in the Basin of Mono River in Republic of Benin

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Open Journal of Modern Hydrology 2022年第3期12卷 95-108页

作者： François de Paule Codo Lauris Senou Apollinaire Tchikpoto Department of Water and sanitation engineering National Water Institute (INE) University of Abomey-Calavi Republic of Benin Laboratory for Water and Environmental Sciences and Technics National Water Institute (INE) University of Abomey-Calavi Republic of Benin

The hydrologic and hydraulic changings on the behavior of Mono river are the result of the stress involved by human activities, on one hand and the construction of the dam of Nangbéto and the exploitation of sand in downstream of the dam by the population, between Athiémé and Agbanankin on other hand. That effect had also affected the shape of the sections of the river in the context of climate variability. It shows consequently that area is also a trapping area of sediments eroded in downstream of the dam and is responsible for the trapping of sediments in the river. The slope and the flow rate are the main factors of the real capacity of transport of a watercourse. They also determine the transport of solid flows from upstream to downstream. This drawing model established by taking into account the bathymetry of a transversal section of the Mono river at Athiémé, is the first step of a global investigation of the solid flow transport in the basin of Mono river and the boundary condition for the characterization of its hydro-sedimentary dynamics study. It aims to take into account sections and the used technique which consist to measure on one located section as the representative section of the river at Athiémé, by moving the boat used for bathymetry.

关键词： Mono River Bathymetry Geometric Drawing Modelling Hydro-Sedimentary Dynamics Trapping

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Steady-State Radial Flow Modeling through the Production Well in the Confined Aquifer of Monzoungoudo,Benin

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Open Journal of Fluid Dynamics 2019年第2期9卷 107-118页

作者： Francois de Paule Codo Babilas Hountondji Martin P.Aina Laboratory for Water Sciences and Technology Department of Water and SanitationNational Water InstituteUniversity of Abomey-CalaviCotonouBenin Physical Mathematics and Applications University of Abomey-CalaviCotonouBenin

This study aims to develop a mathematical analysis for one-dimensional modeling of a radial flow through a production well drilled in a confined aquifer, in the case of steady-state flow conditions. An analytical solution has derived from that expression for estimation of drawdowns according to different flowrates. Through that process, the evaluation of static pressure, the calculation of hydraulic charge due to the waterflow through the well is evaluated, the drawdowns curves are drawn and at last, the obtained curves are analyzed. The curves obtained for the different flow rates have an asymptotic direction, the axis of the hydraulic charges. The variation of the hydraulic charge depends on the radial distance for different flow rates. The P point, is a common point of all curves obtained for different production flowrates in the well. This point is where the well production flowrate is optimum for the optimal hydraulic charge.

关键词： Confined Aquifer Production Well Radial Flow Steady-State Flow Drawdown Cone of Depression

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Mathematical Modeling of the Hydrodynamics of an EGSB Reactor

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Journal of Chemistry and Chemical engineering 2014年第6期8卷 602-610页

作者： Gleyce Teixeira Correia Tania Pérez-Pérez Ileana Pereda-Reyes Deny Oliva Merencio Marcelo Zaiat Wu Hong Kwong Department of Chemical engineering Federal University of Sao Carlos Sao Carlos 13565-905 Brazil Institute of Animal Science Mayabeque 32700 Cuba Study Center of Process engineering Instituto Superior Politécnico "José Antonio Eeheverria " Havana 19390 Cuba Study Center of Renewable Energy Technologies lnstituto Superior Politécnico "José Antonio Echeverria " Havana 19390 Cuba Department of hydraulic and sanitation School of Engineering of Sao Carlos University of Sao Paulo Sao Carlos 13563-120 Brazil

Generally, in the literature, the hydrodynamic behavior of an EGSB (expanded granular sludge bed) reactor is considered as a complete mix reactor. Few works study in detail the flow of such reactors. The aim of this work was to study, in detail, the hydrodynamics of an EGSB reactor and to propose a mathematical model to describe its flow. A 3.04 L reactor was used with HRT (hydraulic retention time) of 12 h, affluent flow rate of 4 mL·min -1, and the recirculation flow rate was changed to study three different upflow velocities in the tube (6, 8 and 10 m·h -1 ). The pulse input method was used, with the use of blue dextran as tracer. In order to consider the dimensional differences between the tube and the separator, the reactor was divided into two regions (tube and separator). Initially, a model with two tubular reactors with dispersion in series was proposed and the Peclet number was adjusted for the two regions. It was observed that the region of the tube shows the behavior of a tubular reactor with high dispersion, whereas the region of the separator shows the behavior of a complete mix reactor. In order to simplify the equation, and by knowing that the concentration profile along the reactor was almost constant, a model of two CSTRs (continuous stirred tank reactors) was proposed in series and the number of reactors (N) was set. The best combination was five CSTRs, three in the tube region and two in the separator region. The presented models were equivalent and can be used to describe the hydrodynamic behavior of the EGSB reactor.

关键词： EGSB反应器数学模型完全混合反应器水动力动力学行为 Peclet数流体力学水力停留时间

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Extreme Events Assessment Methodology Coupling Debris Flow,Flooding and Tidal Levels in the Coastal Floodplain of the Sao Paulo North Coast(Brazil)

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International Journal of Geosciences 2013年第5期4卷 30-38页

作者： Rafael de Oliveira Sakai Diego Lourenco Cartacho Emilia Arasaki Paolo Alfredini Alessandro Pezzoli Wilson Cabral de Sousa Junior Maurizio Rosso Luca Magni Polytechnic School of Sao Paulo University Department of Hydraulic and Environmental EngineeringHarbour and Coastal Area of the Hydraulic LaboratoryAvenida Professor Luciano GualbertoTravessa 3n.380Cidade UniversitariaSao PauloBrazil National Institute of for Space Research Av.Dos Astronautas n.1758Sao Jose dos CamposSao PauloBrazil Polytechnic of Torino Engineering FacultyDepartment of EnvironmentLand and Infrastructure EngineeringCorso Duca degli Abruzzi n.24TorinoItaly Technological Institute of Aeronautics Infrastructure Engineering DivisionDepartment of Hydric Resources and Environmental SanitationPraca Marechal Eduardo Gomes n.50ITA-IEISao Jose dos CamposSao PauloBrazil Studio Rosso Ingegneri Associati s.r.l. Corso Principe OddoneTorinoItaly

The North Coastal Region of the State of S?o Paulo, which comprises the Municipalities of Caraguatatuba, S?o Sebasti?o, Ilhabela and Ubatuba, is one of the most prone to flooding and debris flow deposition Brazilian areas, owing to hydrological extreme rainfall events usually coupled with extreme tidal levels. This risk is also high due to human lives and material assets, with increasing population rates and the establishment of large companies such as the Oil industry, with reduced defense/prevention measures and *** catastrophic scenario of the city of Caraguatatuba, in March 1967, resulting from one of the most serious natural disasters in Brazil, fosters discussions about probabilities of heavy rainfall-caused events and rise in the sea level in coastal areas. Hence, this research is a consequence of this reality. The research is founded on an innovative methodology based on the analysis of past data of rainfall and tidal stations, complemented with debris flow registers in the region of the north coastal zone of the State of S?o Paulo (Brazil). The anaysis developed involved the meteorological, hydraulic, geotechnical and statistical knowledge *** results are intended to be used for urban planning, designs of macro-drainage, fluvial, maritime projects and debris flow retention structures. These practical applications will then associate the probability of occurrence of certain types of heavy rainfall-caused events such as flooding or debris flow coupled with a corresponding increase in tidal levels.

关键词： Meteorology Hydrology Maritime hydraulics Rainfall Tidal Levels Extreme Events Natural Disasters Geomorphology Debris-Flow Flooding

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