An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
leachates, etc ; Serratia marcescens; anaerobic digestion; bioremediation; perchlorates; pollutants; vegetable residues; Show all 7 Subjects
Abstract:
... Perchlorate is a known endocrine-disrupting micropollutant. The efficiency of a low-cost in-situ bio-remediation process for perchlorate-contaminated aqueous phase was evaluated in a bench-scale unit in this study. The two-stage process unit comprises an anaerobic leach bed unit (5.3 L) for generating leachate and an anaerobic filter bed unit (10 L) inoculated with an isolated perchlorate reducing ...
leachates, etc ; alkalinity; concrete; construction industry; microbial communities; pH; runoff; salt tolerance; transportation; water quality; Show all 10 Subjects
Abstract:
... Recycled concrete aggregate (RCA) has been used as an alternative sustainable material in the construction industry, but RCA long-term environmental impacts are unknown. In this study, the bacterial enrichment potential to reduce the alkalinity of two different types of RCA was examined, from laboratory-produced concrete and from a stockpile of demolished concrete that had been in service in trans ...
leachates, etc ; adsorption; aminoquinolines; capacitors; chelation; electronic wastes; ion exchange; magnetic fields; palladium; porous media; Show all 10 Subjects
Abstract:
... Quick and precise recovery of palladium (Pd) from electronic waste remains a serious task, owing to the strong acid and complexity of chemical compounds in leachate. Here, bioinspired construction of magnetic nano stirring rod with radially aligned dual mesopores and abundant 8-aminoquinoline (MNSR-DM-AQ) is proposed for selective and rapid extraction of Pd(II) from highly acidic sample solutions. ...
leachates, etc ; ambient temperature; atmospheric pressure; community structure; disulfides; genes; hydrogen sulfide; microbial communities; oxidoreductases; sulfates; China; Show all 11 Subjects
Abstract:
... Attention should be paid to the sulfate reduction behavior in a pressure-bearing leachate saturated zone. In this study, within the relative pressure range of 0–0.6 MPa, the ambient temperature with the highest sulfate reduction rate of 50°C was selected to explore the difference in sulfate reduction behavior in a pressure-bearing leachate saturated zone. The results showed that the sulfate reduct ...
... Fe/S-bearing erdite flocculant has been proven to be effective in the precipitation of heavy metals from real electroplating wastewater, with the only drawback being the huge production of sludge. This sludge was rich in Fe/S/Zn/Cu/Ni and refractory to be recycled due to the extractant pollution by free Fe and the dissolution of sulphide. Herein, a multistep separation method was developed to diss ...
leachates, etc ; Lolium; X-radiation; X-ray photoelectron spectroscopy; air; alkalinity; bacterial communities; bauxite; biomass; calcite; clay; community structure; dust; humification; kaolinite; land restoration; organic carbon; pH; plant growth; pyrolysis; sawdust; soil; soil formation; China; Show all 24 Subjects
Abstract:
... The extreme alkalinity of bauxite residue (BR) leads to difficulty with its reuse. Alkaline leachate and dust generation during the stacking process can pollute surrounding soil, air and water. In this work, co-pyrolysis of bauxite residue and sawdust was applied to rapidly produce a soil-like matrix that met the conditions for plant growth as demonstrated by ryegrass pot experiments. The present ...
... Elton’s classic diversity-invasibility hypothesis posits that diversity of resident communities increases resistance against invaders. We tested whether the diversity-invasibility relationsip might be mediated by allelopathic effects of the resident species. In a large germination experiment, we exposed seeds of six alien and six native test species to leachates of one, three, six or twelve specie ...
leachates, etc ; antibiotic resistance; environment; landfills; Show all 4 Subjects
Abstract:
... Landfill are important reservoirs of antibiotics and antibiotic resistance genes (ARGs). They harbor diverse contaminants, such as heavy metals and persistent organic chemicals, complex microbial consortia, and anaerobic degradation processes, which facilitate the occurrence, development, and transfer of ARGs and antibiotic resistant bacteria (ARB). The main concern is that antibiotics and develop ...
landfill leachates, etc ; Delphi method; accountability; Show all 3 Subjects
Abstract:
... A tool to quantify the pollution potential of leachate, termed the revised leachate pollution index (r-LPI), has been developed. It was developed using the fuzzy Delphi analytic hierarchy process (FDAHP). The formulation entails four major steps: parameter selection, weight calculation, normalization of parameters, and aggregation of the parameters. Eleven leachate parameters categorized into thre ...
leachates, etc ; environmental assessment; leaves; rubber; tires; toxicity; Show all 6 Subjects
Abstract:
... In recent years, the recycling of waste tyre rubber in construction and road materials has emerged as a potential innovative solution to the growing waste rubber tyre dilemma. However, to determine the feasibility of any recycling method, it is crucial to assess the potential environmental implications of the proposed method. The environmental conditions waste tyre rubber products are exposed to a ...
leachates, etc ; electrochemistry; ion exchange; lithium; stoichiometry; temperature; Show all 6 Subjects
Abstract:
... The preferentially selective extraction of Li⁺ from spent layered transition metal oxide (LiMO₂, M = Ni, Co, Mn, etc.) cathodes has attracted extensive interest based on economic and recycling efficiency requirements. Presently, the efficient recycling of spent LiMO₂ is still challenging due to the element loss in multistep processes. Here, we developed a facile strategy to selectively extract Li⁺ ...
leachates, etc ; anodes; citric acid; glucose; phase transition; Show all 5 Subjects
Abstract:
... The precious metals enriched residue of copper anode slime (PM-CAS) obtained from our previous study, creates favorable conditions for recycling resource. In this study, a green and economical process for resource recovery from PM-CAS is proposed. Results showed that 99.70% Ag and 98.65% Pd were successfully leached in 10 min by HNO₃-citric acid under optimized conditions with 99.81% Au retained i ...
landfill leachates, etc ; antibiotic resistance; chlorination; microplastics; oxidation; regrowth; Show all 6 Subjects
Abstract:
... The prevalence of antibiotic resistance, as well as microplastics (MPs) as vectors for antibiotic resistant bacteria (ARB) and antibiotic resistance genes (ARGs) has attracting growing attention. However, the fate of ARB/ARGs on MPs treated by chlorination and Fenton oxidation were poorly understood. Herein, the removal and regrowth of ARGs/ARB on MPs and in MPs-surrounding landfill leachate (an i ...
leachates, etc ; case studies; dominant species; supply chain; vanadium; Show all 5 Subjects
Abstract:
... Critical metal sustainability is a worldwide issue whose extraction relies on hydrometallurgy mostly. The significance of metal ion species evolution in critical metal hydrometallurgy-extraction has got more and more attention. Here, the importance of the metal ion species during the whole vanadium recycling process has been evaluated quantitatively for the first time. Metal ion species as the key ...
leachates, etc ; dominant species; geochemistry; gold; rain; silver; toxicity; Show all 7 Subjects
Abstract:
... Metal leachate from mine tailings has the potential to release toxic metals into the surrounding environment. A single-step extraction procedure mimicking rainwater and a three-step BCR sequential extraction procedure (acid, reducing and oxidizing conditions) were applied to gold (GMT) and silver (SMT) mine tailings. Major (Al, Ca, Fe, Mg, and Mn) and trace metals were monitored to better understa ...
leachates, etc ; combustion; ionization; oxygen; particle size; straw; thermodynamics; wood; Show all 8 Subjects
Abstract:
... Chemical looping combustion of wood pellets (WP), wood char (WC), and straw pellets (SP) was conducted in a 60 kW CLC pilot with ilmenite and braunite oxygen carriers (OCs). Alkali emissions were investigated with impactor-based and surface ionization detector (SID) measurements. Particle size distributions for WP and WC fuels were dominated by coarse particles formed by refractory species. For SP ...
leachates, etc ; industrialization; landfills; pollution; research; urbanization; waste disposal; wastes; Show all 8 Subjects
Abstract:
... With the increase in global population, industrialization, and urbanization, waste from construction, renovation, and demolition (CRD) activities has grown rapidly. There are some issues associated with the disposal of CRD waste in landfills. Depositing in landfills is still the main method for CRD waste disposal from the global perspective. The objective of this study is to comprehensively review ...
leachates, etc ; Geranium; germination; leaves; secondary metabolites; seedling growth; wheat; Show all 7 Subjects
Abstract:
... Geranium is rich in secondary metabolites, and thus possess medicinal properties. An attempt was made during present investigation to study the effect of geranium leaf leachate on germination of wheat seeds. It was observe that and leaf leachate inhibited seedling growth. ...
leachates, etc ; calcium carbonate; humidity; microscopy; pH; remediation; toxicity; wastes; Show all 8 Subjects
Abstract:
... In this study, the feasibility of promoting microbially induced carbonate precipitation (MICP) in mine waste piles by using an environmental bacterial enrichment is explored, with goals to reduce metals and acid leaching. MICP has been explored for remediation applications and stabilization of mine waste. Here, we utilize a native bacterial enrichment to promote MICP on seven mine waste samples wi ...
leachates, etc ; European Union; barley; groundwater; insecticides; risk; soil; tebuconazole; Show all 8 Subjects
Abstract:
... Seed dressing with fungicide or insecticide is a standard procedure for growing major crops, but very little is known about the leaching risk and the general fate of pesticides from coated seeds. Triazole fungicides are commonly used seed dressing fungicides and recently, there has been increasing concern that 1,2,4-triazole, a major degradation product of several triazole fungicides, may leach to ...