scholarly journals Remediation Techniques for Cadmium-Contaminated Dredged River Sediments after Land Disposal

2021 ◽  
Vol 13 (11) ◽  
pp. 6093
Author(s):  
Changsong Zhang ◽  
Xueke Zang ◽  
Zhenxue Dai ◽  
Xiaoying Zhang ◽  
Ziqi Ma
Keyword(s):  
River Sediments ◽  
Environmental Safety ◽  
Current Status ◽  
Soil Leaching ◽  
Cd Contamination ◽  
Land Disposal ◽  
Stabilization Technique ◽  
Cd Removal ◽  
Timely Treatment ◽  
Soil Cd

This paper examines the remediation techniques of cadmium (Cd)-contaminated dredged river sediments after land disposal in a city in East China. Three remediation techniques, including stabilization, soil leaching, and phytoremediation, are compared by analyzing the performance of the techniques for Cd-contaminated soil remediation. The experimental results showed that the stabilization technique reduced the leaching rate of soil Cd from 33.3% to 14.3%, thus effectively reducing the biological toxicity of environmental Cd, but the total amount of Cd in soil did not decrease. Leaching soil with citric acid and oxalic acid achieved Cd removal rates of 90.1% and 92.4%, respectively. Compared with these two remediation techniques, phytoremediation was more efficient and easier to implement and had less secondary pollution, but it took more time, usually several years. In this study, these three remediation techniques were analyzed and discussed from technical, economic, and environmental safety perspectives by comprehensively considering the current status and future plans of the study site. Soil leaching was found to be the best technique for timely treatment of Cd contamination in dredged river sediments after land disposal.

Enhanced Electrokinetic Remediation of Cadmium (Cd)-Contaminated Soil With Interval Power breaking

2021 ◽  
Author(s):  
Zongping Cai ◽  
Yan Sun ◽  
Yanghong Deng ◽  
Xiaojie Zheng ◽  
Shuiyu Sun ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Power Supply ◽  
Contaminated Soil ◽  
Laboratory Experiments ◽  
Electrokinetic Remediation ◽  
Charged Species ◽  
Continuous Power ◽  
Cd Removal ◽  
Cd Species ◽  
Soil Cd

Abstract This study compared electrokinetic (EK) remediation with and without interval power breaking in the removal of total and plant available cadmium (Cd) in the soil. Two laboratory experiments, i.e. EK remediation with interval power breaking (24-12 h power-on-off cycles) and conventional EK remediation (continuous power supply) with the same accumulated time (192 h) of power supply were conducted to remove soil Cd. After the EK remediation by interval power breaking, the total Cd removal efficiency in the soil rose to 38%, in comparison to 28% by the conventional EK remediation. As for the plant available Cd, the removal efficiency was enhanced from 52% to 63%. Additionally, the electric current during the EK remediation and electric conductivity after the EK remediation were higher in the soil treated by interval power breaking, which indicated an enhanced desorption and/or migration of charged species. It further meant that the higher removal efficiency of soil Cd by interval power breaking could be related to the enhanced desorption and/or migration of Cd species. This study indicated that both conventional EK remediation and EK remediation with interval power breaking were effective methods to remove soil Cd but EK remediation with interval power breaking was more efficient.

scholarly journals Cadmium Uptake in Native Cacao Trees in Agricultural Lands of Bagua, Peru

Agronomy ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1551
Author(s):  
Manuel Oliva ◽  
Karol Rubio ◽  
Melissa Epquin ◽  
Gladys Marlo ◽  
Santos Leiva
Keyword(s):  
Soil Ph ◽  
Agricultural Soil ◽  
Sampling Site ◽  
Great Variability ◽  
Agricultural Lands ◽  
Cd Contamination ◽  
Cocoa Farm ◽  
Cd Exposure ◽  
Farm Soils ◽  
Soil Cd

Cadmium (Cd) contamination threatens cocoa farming in the province of Bagua in Amazonas, Peru. This study reports our assessment of Cd concentrations in cocoa farm soils, and in cocoa roots, leaves, testa, and cotyledon, thus evaluating the magnitude of the problem caused by Cd exposure. For our analysis, we sampled agricultural soil, cocoa roots, leaves and pods at 29 farms in the province of Bagua. Concentrations of Cd in each of the samples were measured and correlated with selected variables at each sampling site. Within our collection of samples, Cd levels showed great variability. In soil, Cd concentrations ranged between 1.02 and 3.54 mg kg−1. Concentrations of this metal within cocoa trees measured from roots, leaves, testa, and cotyledon, Cd ranged from 0.49 mg kg−1 to 2.53 mg kg−1. The cocoa trees exhibited variable degrees of allocation Cd from the soil to their tissues and thus considerable variation among themselves. We found that Cd amounts in roots were up to five times more concentrated than Cd levels in the soils and 2.85 times [Cd] the amounts found in cotyledon. Soil pH is a key variable enabling the uptake of this metal. Most importantly, our evaluation determined that measurements from the majority of farms exceeded the maximum permissible limits established by Peruvian and European legislation.

scholarly journals Phytoremediation of Cadmium Polluted Soils: Current Status and Approaches for Enhancing

Soil Systems ◽  
2022 ◽  
Vol 6 (1) ◽  
pp. 3
Author(s):  
Mirel Subašić ◽  
Dunja Šamec ◽  
Alisa Selović ◽  
Erna Karalija
Keyword(s):  
Food Chain ◽  
Contaminated Soils ◽  
Plant Biomass ◽  
Seed Priming ◽  
Current Data ◽  
Current Status ◽  
Polluted Soils ◽  
Novel Approach ◽  
Cd Contamination ◽  
Accumulation Capacity

Cadmium (Cd) is a heavy metal present in atmosphere, rocks, sediments, and soils without a known role in plants. It is relatively mobile and can easily enter from soil into groundwater and contaminate the food chain. Its presence in food in excess amounts may cause severe conditions in humans, therefore prevention of cadmium entering the food chain and its removal from contaminated soils are important steps in preserving public health. In the last several years, several approaches for Cd remediation have been proposed, such as the use of soil amendments or biological systems for reduction of Cd contamination. One of the approaches is phytoremediation, which involves the use of plants for soil clean-up. In this review we summarized current data on the use of different plants in phytoremediation of Cd as well as information about different approaches which have been used to enhance phytoremediation. This includes data on the increasing metal bioavailability in the soil, plant biomass, and plant accumulation capacity as well as seed priming as a promising novel approach for phytoremediation enhancing.

scholarly journals Influence of Carbon Quantum Dots on the Biome

Processes ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 445
Author(s):  
Jose Peralta-Videa ◽  
Sreeprasad T Sreenivasan ◽  
Mahesh Narayan
Keyword(s):  
Quantum Dots ◽  
Environmental Safety ◽  
Carbon Quantum Dots ◽  
Current Status ◽  
Detailed Knowledge ◽  
Fruit Peel ◽  
Crossover Point ◽  
Model Studies ◽  
Detailed Assessment ◽  
Heterogeneous Ensemble

The latest class of engineered nanomaterials, viz., carbon quantum dots (CQDs), has attracted attention because they are synthesized through green chemical procedures and from organic waste matter. The synthesis of these nano-sized particles synthesized from biomass such as fruit peel and other organic matter results in mixtures of CQD species that differ in chemical identity, activity and photo-physical properties. Generally used collectively as chemically heterogeneous ensemble, they have already had an impact on multiple sectors of our environment by use as wastewater sensors, switches, model agro-fertilizers, and in biomedicine. The transitioning of their applications to crops is an important crossover point that calls for an accurate and detailed assessment of their genomic, proteomic, and metabolomics impact on agriculturally important crops and produce. We review the current status of CQDs vis-à-vis their impact on the biosphere via recent model studies and comment on the knowledge gaps that need to be bridged to ensure their safe use in agronomy. A detailed knowledge of their impact on aquatic systems and the food-chain is critical for human and environmental safety and sustainability.

scholarly journals The Potential Effectiveness of Biochar Application to Reduce Soil Cd Bioavailability and Encourage Oak Seedling Growth

2020 ◽  
Vol 10 (10) ◽  
pp. 3410 ◽  
Author(s):  
Elnaz Amirahmadi ◽  
Seyed Mohammad Hojjati ◽  
Claudia Kammann ◽  
Mohammad Ghorbani ◽  
Pourya Biparva
Keyword(s):  
Contaminated Soil ◽  
Polluted Soil ◽  
Tolerance Index ◽  
Seedling Height ◽  
Loamy Soil ◽  
Potential Effectiveness ◽  
Soil Cadmium ◽  
Cd Removal ◽  
Soil Cd ◽  
Oak Seedlings

Today, it is very important to protect plants in soils contaminated with metals. We investigated the behavior of cadmium during the establishment of oak seedlings (Quercus castaneifolia C.A. Mey.) under biochar influence. This study was conducted in pots with loamy soil. Cadmium was added to soil at 0, 10, 30, and 50 mg per kg of soil, indicated by Control, Cd10, Cd30 and Cd50. Biochar was produced at 500–550 °C from rice husk and added at 1, 3, and 5% (wt/wt) levels, indicated by B1, B3, B5, and mixed with soil at planting in three replications. Generally, increasing biochar rates had significant effects on seedling height, diameter, and biomass. This coincided with Cd immobilization in the contaminated soil which reflects a decrease in Cd concentrations in the plant bioavailability of Cd. The tolerance index increased significantly, by 40.9%, 56%, and 60.6% in B1, B3, and B5 with Cd50, respectively, compared to polluted soil. The percent of Cd removal efficiency for Cd50 was 21%, 47%, and 67% in B1, B2, and B5, respectively. Our study highlights that biochar can reduce Cd bioavailability and improve the growth of oak seedlings in contaminated soil.

scholarly journals Modernization of FSUE Atomflot Infrastructure and Material and Technical Resources Aimed at Provision of Environmental Safety in the Northwest of Russia

2017 ◽  
pp. 130-136
Author(s):  
M.M. Kashka ◽  
◽  
E.A. Efanskaya ◽  
V.A. Kobzev ◽  
A.Y. Bogdanov ◽  
...  
Keyword(s):  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Environmental Safety ◽  
Radioactive Wastes ◽  
Current Status ◽  
Materials Management ◽  
Murmansk Region ◽  
Environmental Rehabilitation ◽  
The Status ◽  
Northwest Of Russia

The article reviews FSUA Atomflot assets and facilities used to manage spent nuclear fuel (SNF) and radioactive wastes (RW), their modernization and development, as well as sources of the aforementioned processes financing, which include both Russian Federation and International funding. FSUE Atomflot participation in the environmental rehabilitation of the Northwest of Russia is analyzed, part of which is the status of retired atomic icebreakers and special maintenance vessels decommissioning. The key direction of FSUE Atomflot policy is safe handling of spent nuclear fuel and radioactive wastes accumulated by the Company itself and other organizations in Murmansk region. Modernization of FSUE Atomflot infrastructure and material and technical resources is meant to solve this task. FSUE Atomflot operates state atomic icebreaking fleet, which includes commercial operation, maintenance, modernization, repair and decommissioning of nuclear-powered icebreakers and special maintenance vessels. Handling of spent nuclear fuel and radioactive wastes that are accumulated during the process of operation through the assets life cycle is an important part of the Company’s activity. The important role in the provision of environmental safety belongs to the Strategic Master Plan for Decommissioning of Retired Russian Nuclear Fleet and Environmental Rehabilitation of Its Supporting Infrastructure in the Northwest of Russia, which was ordered by Rosatom and developed under scientific guidance by Nuclear Safety Institute of Russian Academy of Science. The article further describes the process of SNF and RW handling by FSUE Atomflot, brings up the statistical data of the materials management and transportation. Second part of the article describes the decommissioning of atomic icebreakers and maintenance vessels as part of the environmental safety provision process. The current status of the process, results and development plans are resumed.

scholarly journals Current Status and Prospects for the Development of the Integrated Transit Transport System (ITTS) of Russia on the Basis of Vacuum Magnetic Levitation Transport (VMLT)

2019 ◽  
Vol 5 (4) ◽  
pp. 25-62
Author(s):  
Yuriy A. Terentyev ◽  
Valery V. Filimonov ◽  
Vladimir G. Shavrov ◽  
Victor V. Koledov ◽  
Svetlana V. Fongratowski ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Transport System ◽  
New Technologies ◽  
Magnetic Levitation ◽  
Environmental Safety ◽  
Transport Systems ◽  
Human Potential ◽  
Current Status ◽  
Base System ◽  
Economic Ties

New economy - an innovative economy - forms new challenges and new solutions in all spheres of human activity. A key feature of the new economic ties is their global nature. Transport systems based on existing technologies cannot provide the necessary growth of new economic ties and the effective provision of the existing business. New transport systems based on new technologies for transporting goods and passengers in compliance with the principles of energy and financial efficiency, as well as environmental safety, create the foundation for sustainable development of countries and regions, including improving the quality of life of the population and human potential. The rapid speed economic is been formed for nowadays commercial transportation communication. And a realization of any transport project has always tight connection and mutually conditioned with another project type energetics. So, the problem of energy efficiency and energy supply becomes a key factor of a choice of the most energy efficiency of a base system in any transport complex! Aim: The purpose of this article is to provide an alternative solution - the Integrated transit transport system (ITTS) of the Russian Federation based on the energy save technologies of Vacuum magnetic levitation transport (VMLT). Methods: The article discusses organizational, technical, energy efficient, logistic and economic solutions in the field of high-speed land corridors and "energy pipelines" projects, created on the basis of the latest vacuum magnetic levitation transport (VMLT) technologies. Experimental stands used are described, an overview of practical results obtained in laboratory and production equipment, and preliminary results of VMLT prototypings based on a miniature route of rare-earth magnets and leviters based on ceramics from a high-temperature superconductor, possibilities, prospects and the first experimental results of development are presented. of the main critical elements of the WMLT technology. The paper describes the results of using modern additive manufacturing technologies (3d printing) to create a system model, microcryogenic systems, HTSC and REM "nitrogen" temperature levels to create trace elements and system models, with the ability to scale to the current full-size model of the next generation. Results: The presented calculations show the practical possibility of further development and implementation of this project, as well as its very high effectiveness compared to existing systems in terms of practical application, economic, manufacturing, energy efficiency and environmental safety.

scholarly journals Assessment of contamination and origin of metals in mining affected river sediments: A case study of the Aries catchment, Romania

2014 ◽  
Vol 79 (8) ◽  
pp. 1019-1036 ◽  
Author(s):  
Erika Levei ◽  
Michaela Ponta ◽  
Marin Senila ◽  
Mirela Miclean ◽  
Tiberiu Frentiu
Keyword(s):  
River Sediments ◽  
Sediment Quality ◽  
Principal Component ◽  
Current Status ◽  
Left Bank ◽  
Quality Guidelines ◽  
Total Variability ◽  
Contamination Levels ◽  
The Right

The study presents the current status of contamination with metals (Cu, Cr, Cd, Pb, Ni, Zn, As) and their anthropogenic or natural origin in the sediments of the Aries river basin, Romania, affected by mining activities. The results indicated an enrichment of metals in sediments. Different contamination levels were identified on the Aries river and its tributaries. According to sediment quality guidelines and contamination indices, sediments from the Aries river were found to be highly contaminated with Cd, Cu, As, considerably with Zn and moderately with Pb and Ni. The right-bank tributaries were found to be more contaminated than the left-bank affluents, where only a contamination with As of geogenic origin was identified. The Principal Component Analysis allowed to identify five latent factors (86 % total variability) reflecting the anthropogenic and natural origins of metals. Arsenic, Cd and partially Pb were found to have a common anthropogenic origin, different from that of Cu. The statistical approach indicated also the geogenic origin of Pb due to its association with Ca, K, Na, Sr. Chromium and Ni were attributed to natural source following their association with Mn, Fe, Al and Mg, respectively.

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