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Electrocoagulation coupled with electrooxidation for the simultaneous treatment of multiple pollutants in contaminated sediments

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Journal of environmental Sciences 2023年第2期124卷 89-97页

作者： Qingjun Zeng Yifan Zhang Pingshan Chen Yuting He Congli Yi Chunhua Feng Fourth Harbor Engineering Institute Co. Ltd.China Communications Construction Co.Ltd.Guangzhou 510230China Key Laboratory of Environmental Protection&Safety of Communication Foundation Engineering China Communications Construction Co.Ltd.Guangzhou 510230China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of EducationSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510006China

In situ and simultaneous remediation of a variety of pollutants in sediments remains a *** this study,we report that the combination of electrocoagulation(EC)and electrooxidation(EO)is efficient in the immobilization of phosphorus and heavymetals and in the oxidation of ammonium and toxic *** integratedmixed metal oxide(MMO)/Fe anode system allowed the facile removal of ammonium and phosphorus in the overlying water(99% of 10 mg/L NH_(4)^(+)-N and 95% of 10 mg/L P disappeared in 15 and 30 min,respectively).Compared with the controls of the single Fe anode and single MMO anode systems,the dual MMO/Fe anode system significantly improved the removal of phenanthrene and promoted the transition of Pb and Cu from the mobile species to the immobile *** concentrations of Pb and Cu in the toxicity characteristic leaching procedure extracts were reduced by 99%and 97% after an 8 hr *** tests with four real polluted samples indicated that substantial proportions of acid-soluble fraction Pb and Cu were reduced(30%-31% for Pb and 16%–23% for Cu),and the amounts of total organic carbon and NH_(4)^(+)-N decreased by 56%–71% and 32%–63%,*** was proposed that the in situ electrogenerated Fe(II)at the Fe anode and the active oxygen/chlorine species at the MMO anode are conducive to outstanding performance in the co-treatment of multiple *** results suggest that the EC/EO method is a powerful technology for the in situ remediation of sediments contaminated with different pollutants.

关键词： In situ sediment remediation Electrocoagulation Electrooxidation Stabilization of heavy metals Ammonia oxidation Removal of polycyclic aromatic hydrocarbons

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Research on the Application of Artificial Intelligence in Underwater DCM Intensity Prediction 24

Research on the Application of Artificial Intelligence in Un...

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2024 International Conference on Image Processing, Intelligent Control and Computer engineering, IPICE 2024

作者： Teng, Chao Mao, Fengshan CCCC Fourth Harbor Engineering Institute Co. Ltd China CCCC Key lab of environmental Protection &Safety in Foundation Engineering of Transportation China Southern Marine Science and Engineering Guangdong Laboratory China

ISBN: (纸本)9798400710285

After the construction of Deep Cement Mixing (DCM) piles underwater, due to the formed strength, it is difficult to repair any unqualified pile. The only option is to supplement with additional piles in the nearby area. However, in some construction areas with high requirements for project quality and settlement, full-scale reinforcement is needed, leaving no room even for supplementary piling, posing challenges to quality control. There is a large amount of research on the strength prediction of cement soil indoor mix ratio tests both domestically and internationally, but they fail to consider the parameter changes during actual construction. In this paper, based on real-time raw data from inspection piles of actual construction projects, a"survey-construction-inspection" associated data set is established. Quality prediction is performed using three methods: BP neural network, random forest, and support vector machine regression. Among them, the random forest has the best prediction effect, with a mean square error of 0.86MPa in the test set and an average relative error of 15.8%. Based on this technology, the quality of the formed piles can be predicted immediately after construction. Pile sections at risk of poor quality can be timely grouted and mixed to improve project quality. © 2024 Copyright held by the owner/author(s).

关键词： Soil testing

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Experimental Study on Inertia and Drag Coefficients for Circular Columns and Square Pontoons in Oblique Internal Solitary Waves 33rd

Experimental Study on Inertia and Drag Coefficients for Circ...

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33rd International Ocean and Polar engineering Conference, ISOPE 2023

作者： Chen, Min Chen, Jin You, Yun-Xiang Sheng, Song-Wei Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou China Key Laboratory of Renewable Energy Chinese Academy of Sciences Guangzhou China CCCC Fourth Harbor Engineering Institute Co. Ltd. Guangzhou China CCCC Key Lab of Environmental Protection & Safety in Foundation Engineering of Transportation Guangzhou China Zhuhai China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9781880653807

Inertia and drag coefficients for a platform with circular columns and square pontoons are predicted by an experimental approach in oblique internal solitary waves (ISWs). The ISW incidence angle is 0 deg, 30 deg and 45deg. A series of depression ISWs were generated by a laboratory wave-maker in a density stratified two-layer fluid system in a wave flume. Conductivity probes are used to record ISW profiles at the interface of the two-layer fluid system. Effects of layer depths with h1/h2=20/80，25/75，30/70，35/65 on inertia and drag coefficients were examined. The inertia and drag coefficients in Morison’s equation are determined by least square fit of measurements on circular columns and square pontoons. Results show that the inertia coefficient decreases with KC number in power function, while the drag coefficient decreases with Re number in exponential function. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Drag coefficient

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CFD Simulation of Vortex Induced Motion of a Caisson during Installation Process

CFD Simulation of Vortex Induced Motion of a Caisson during ...

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2023 International Conference on Applied Mechanics, Materials Physics, and engineering Structures, MMPES 2023

作者： Chen, Jin Chen, Min Liu, Mingyue CCCC Fourth Harbor Engineering Institute Co. Ltd. Guangdong Guangzhou China CCCC Key Lab of Environmental Protection & Safety in Foundation Engineering of Transportation Guangdong Guangzhou China Guangdong Zhuhai China Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangdong Guangzhou China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai200240 China

This paper presents the CFD investigation of the vortex induced motion (VIM) of a caisson model during the installation process. The simulations were performed by solving the unsteady 3D Navier-Stokes equation. The Dynamic Fluid-Body Interaction (DFBI) tool is utilized to simulate the motions. Typical draft conditions of a caisson during installation process are considered. The present methodology is verified through the free decay and the VIM of a cylinder simulations in two-dimension. Free decay simulations show that the natural frequency decrease with the increasing draft of the caisson. Maximum response amplitudes occur in the range of 10 © Published under licence by IOP Publishing Ltd.

关键词： Computational fluid dynamics

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CFD Simulation of the Vortex Induced Motion of a Caisson during Installation in Current 33rd

CFD Simulation of the Vortex Induced Motion of a Caisson dur...

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33rd International Ocean and Polar engineering Conference, ISOPE 2023

作者： Chen, Jin Su, Lin-Wang Chen, Min Liu, Ming-Yue CCCC Fourth Harbor Engineering Institute Co. Ltd. Guangdong Guangzhou China CCCC Key Lab of Environmental Protection & Safety in Foundation Engineering of Transportation Guangdong Guangzhou China Guangdong Zhuhai China Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangdong Guangzhou China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9781880653807

This paper presents the CFD investigation of the vortex induced motion (VIM) of a caisson model during the installation phase. The simulations were performed by solving the unsteady 3D Navier-Stokes equation. The Dynamic Fluid-Body Interaction (DFBI) tool is utilized to simulate the motions. Typical draft conditions of a caisson during installation process are considered. The present methodology is verified through the free decay and the VIM of a cylinder simulations in two-dimension. Free decay simulations show that the natural frequency decrease with the increasing draft of the caisson. Maximum response amplitudes occur in the range of 10r y is very close to the natural frequency *** inline/crossflow response frequency increases as the draft increases at the same reduced velocity Vr. The response frequency in the inline direction is double of that in the crossflow direction. The oscillating lift force dominates the crossflow oscillatory motion. Eight-shaped trajectories are observed the maximum displacements in the crossflow direction increase as the drafts increase. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Computational fluid dynamics

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Research and Application of Digital Twinning for the Immersed Tunnel Prefabrication

Research and Application of Digital Twinning for the Immerse...

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第42届中国控制会议

作者： Chengyong Wen Zongquan Ying CCCC Fourth Harbor Engineering Institute Co. Ltd. CCCC Key Lab of Environmental Protection & Safety in Foundation Engineering of Transportation Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)

In order to adapt to the production requirements of ultra-large immersed tunnel prefabrication in the new era,this paper integrates the theoretical research in the early stage of the subject,designs the framework of production management system according to 4 basic layers,and forms the digital twin technology of immersed tunnel prefabrication *** combines the construction information of each independent construction region *** digital information window was used to carry out precision control of the whole process of steel shell-concrete tunnel prefabrication with the logic design of the blueprint and C++ program in Unreal *** solves the problems in the traditional construction industry effectively,and realizes the construction objectives of traceable information management of mixing plant,cooperative scheduling of multiple equipment,intelligent concrete casting in concealed compartment,safe & long-distance transportation of tunnel section.

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Road performance and construction of weathered siltstone for expressway subgrade 3

Road performance and construction of weathered siltstone for...

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2020 3rd International Symposium on Traffic Transportation and Civil Architecture, ISTTCA 2020

作者： De-Yong, Wang Jun-Long, Hu Jing, Wang Shang-Hui, Gao CCCC Fourth Harbor Engineering Institute Co. Ltd. Guangzhou510230 China Key Laboratory of Environmental Protection and Safety of Communication Foundation Engineering CCCC Guangzhou510230 China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai519082 China Sixth Engineering Company of CCCC Fourth Harbor Engineering Co. Ltd. Zhuhai51900 China

Whether weathered siltstone can be used for expressway subgrade filling, there is currently no clear regulation, and there is a lack of relevant evaluation standards. In order to solve the problem of expressway slag disposal and the source of subgrade fillers, relying on an expressway in northern Guangdong, the characteristics of compaction and disintegration of weathered siltstone material are tested and studied. The research shows that: the weathered sandstone material has strong softening and disintegration characteristics, but good compaction performance, and can be used for expressway subgrade filling. The filling process parameters of weathered siltstone subgrade are determined through field test. © Published under licence by IOP Publishing Ltd.

关键词： Slags

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Review of soft rock weathered material for subgrade filling 3

Review of soft rock weathered material for subgrade filling

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2020 3rd International Symposium on Traffic Transportation and Civil Architecture, ISTTCA 2020

With the continuous construction and development of Chinese infrastructure, more and higher requirements are imposed on the construction of expressway engineering. The construction of mountainous expressway has been gradually transformed from winding mountain to bridging and digging tunnels. Various forms of subgrade such as high filling and deep cutting, half filling and half cutting are unavoidable. The huge demand for roadbed filling and the inconvenience of transportation conditions have caused extreme costs for external materials. On the other hand, tunnel excavation brings a large amount of soft rock abandoned slag. If soft rock abandoned slag can be used for subgrade filling, it will not only help avoid resource waste, but also help reduce environmental damage. This paper introduces progress of researches at home and abroad on engineering properties, particle composition and distribution characteristics, CBR, compaction characteristics, etc. of soft rock, as well as the evaluation criteria and applicability of soft rock as subgrade filler in detail. © Published under licence by IOP Publishing Ltd.

关键词： Slags

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Research and Application of Digital Twinning for the Immersed Tunnel Prefabrication

Research and Application of Digital Twinning for the Immerse...

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Chinese Control Conference (CCC)

作者： Chengyong Wen Zongquan Ying CCCC Fourth Harbor Engineering Institute Co. Ltd. Guangzhou Guangdong China CCCC Key Lab of Environmental Protection & Safety in Foundation Engineering of Transportation Guangzhou Guangdong China Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) Zhuhai Guangdong China

In order to adapt to the production requirements of ultra-large immersed tunnel prefabrication in the new era, this paper integrates the theoretical research in the early stage of the subject, designs the framework of production management system according to 4 basic layers, and forms the digital twin technology of immersed tunnel prefabrication factory. It combines the construction information of each independent construction region successfully. The digital information window was used to carry out precision control of the whole process of steel shell-concrete tunnel prefabrication with the logic design of the blueprint and C++ program in Unreal Engine. It solves the problems in the traditional construction industry effectively, and realizes the construction objectives of traceable information management of mixing plant, cooperative scheduling of multiple equipment, intelligent concrete casting in concealed compartment, safe & long-distance transportation of tunnel section.

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Study on the selection of vegetation for ecological restoration of residual soil slopes in South China 10

Study on the selection of vegetation for ecological restorat...

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2020 10th Chinese Geosynthetics Conference and International Symposium on Civil engineering and Geosynthetics, ISCEG 2020

作者： Wang, De-Yong Hu, Jun-Long Wang, Jing Zun, Qingjun CCCC Fourth Harbor Engineering Institute Co. Ltd. Guangzhou510230 China Key Laboratory of Environmental Protection and Safety of Communication Foundation Engineering CCCC Guangzhou510230 China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai519082 China

Vegetation selection is one of the key contents of slope ecological restoration, based on the characteristics of climate and soil in South China and the principle of local conditions, this paper studies the selection of vegetation in the ecological restoration project of the residual soil slope. The typical herbs, shrubs and trees suitable for the area are determined by theoretical analysis. At the same time, through field tests, the growth and development of vegetation after the spraying are monitored for a long time, and the interaction relationship between vegetation community after multiple vegetation mix-ups is analyzed. The results show that plant selection should avoid the choice of a single plant, and should try to achieve complementary coordination between species. At the same time, when taking a variety of plant mixing spray, the configuration ratio of different plants should be determined according to the growth cycle of different plants and the results of indoor ratio test, so as to avoid mutual interference. © The Authors, published by EDP Sciences 2020.

关键词： Vegetation

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