Waste Treatment Research Papers - Academia.edu (original) (raw)

This study presents physical and chemical properties of iron nickel slag obtained from metallurgical Plants of Barro Alto and Niquelândia, owned by Anglo American and located in Goias State, Brazil. Current results for real and apparent... more

This study presents physical and chemical properties of iron nickel slag obtained from metallurgical Plants of Barro Alto and Niquelândia, owned by Anglo American and located in Goias State, Brazil. Current results for real and apparent density, bulk density, particle size distribution by sieving, absorption and results for Iigand physical characterization used in the mix are presented. Aspects related to the process for obtaining this material as a by-product in the FeNi Plant are also described. From slag samples analysis was possible to obtain a trace of asphaltic concrete mix, using the Pen50/70 and concentration of ligands equal to 5%, 6% and 7% in the the mixture, which was measured by Marshal method. Results of tensile strength tests, by diametrical compression, volume percentage of voids, empty bitumen ratio, stability and fluency, to determine the optimum binder content of asphalt mix are described. The results indicate that the iron nickel slag particle size distribution c...

Table 3-Summary of Thermodynamic Data Added to the PHREEQC Database Phase Reaction Log Ksp ΔHr (kcal) Troilite Fe2+(aq)+ S2-(aq)→ FeS (s) 19.08-10.89 Pyrite Fe2+(aq)+ S0 (aq)+ S2-(aq)→ FeS2 (s) 29.26-27.59 Marcasite Fe2+(aq)+ S0 (aq)+... more

Table 3-Summary of Thermodynamic Data Added to the PHREEQC Database Phase Reaction Log Ksp ΔHr (kcal) Troilite Fe2+(aq)+ S2-(aq)→ FeS (s) 19.08-10.89 Pyrite Fe2+(aq)+ S0 (aq)+ S2-(aq)→ FeS2 (s) 29.26-27.59 Marcasite Fe2+(aq)+ S0 (aq)+ S2-(aq)→ FeS2 (s) ...

Une multitude de résidus pharmaceutiques sont quotidiennement rejetés dans les eaux usées suivant une consommation humaine. Aux usines de traitement des eaux, là où ils seraient habituellement éliminés, ces résidus résistent aux procédés... more

Une multitude de résidus pharmaceutiques sont quotidiennement rejetés dans les eaux usées suivant une consommation humaine. Aux usines de traitement des eaux, là où ils seraient habituellement éliminés, ces résidus résistent aux procédés traditionnels et poursuivent leur chemin vers les cours d’eau [1]. Bien qu’en microtraces, ces contaminants de l’eau ont des effets néfastes tant sur l’homme que sur les écosystèmes aquatiques [2]. C’est donc pour cette raison qu’un nouveau nanomatériau écologique a été développé pour retenir par adsorption les contaminants pharmaceutiques. Son efficacité a été évaluée sur un antidépresseur, la fluoxétine (Prozac®). Sa capacité à être réutilisée sur plusieurs cycles par désorption a également été testée. Introduction

Background: The problem of medical hazardous and toxic materials waste management is still often the problem of mostly being in hospitals plus during the COVID-19 pandemic. Objective: The study aimed to evaluate the management of medical... more

Background: The problem of medical hazardous and toxic materials waste management is still often the problem of mostly being in hospitals plus during the COVID-19 pandemic. Objective: The study aimed to evaluate the management of medical hazardous and toxic materials waste at Diponegoro National Hospital, Semarang city during the COVID-19 pandemic.Methods: Data collection was carried out through qualitative descriptions.Results: Management that has not been in accordance with regulations was waste bags that were still found that have not been equipped with infectious symbols, the binding to garbage bags was not correct, and the bags were still hollow. There was still a discrepancy in the waste storage at the TPS, namely the floor of the TPS looks dirty. Selection of special lines for transportation, provision of disinfectants and noncompliance with the use of Personal Protective Equipment (PPE) for waste officers.Conclusion: It is recommended that the Hospital has made efforts to me...

Continuous stirred tank reactors (CSTR) operated at 35"C, were efficaciously used for the anaerobic digestion of a petrochemical effluent. Bio-filtration of petrochemical wastewater was carried out and the results were evaluated in... more

Continuous stirred tank reactors (CSTR) operated at 35"C, were efficaciously used for the anaerobic digestion of a petrochemical effluent. Bio-filtration of petrochemical wastewater was carried out and the results were evaluated in terms of basic water quality parameters. The effects of organic loadings, solid retention time were also investigated. COD reductions of 93-98% were found at an optimum retention time of 2.3 days and a loading rate of 4.7 kg COD/m3/d. The amount of biogas produced was 0.88 m3/m3/d (STP), with a methane content of 90-96%. Volatile fatty acid removal was also achieved up to 97% after performing bio-filtration process. Therefore, the current work revils that bio-filtration of petrochemical wastewater using CSTR might be an effective solution to the prevailing treatment limitation.

EPRI initiated a program of research and development work in collaboration with Bradtec, which has led to the "EPRI DFD" (Decontamination for Decommissioning) Process. The Process has been patented and licensed to six companies... more

EPRI initiated a program of research and development work in collaboration with Bradtec, which has led to the "EPRI DFD" (Decontamination for Decommissioning) Process. The Process has been patented and licensed to six companies worldwide. The purpose of this process is ...

Energy plan to address Waste Treatment and Immobilization Plant (WTP) Vessels Mixing Issues; IP for DNFSB 2010-2. The attached report provides documentation ofthe basis for selection ofspecific test configurations for testing relative to... more

Energy plan to address Waste Treatment and Immobilization Plant (WTP) Vessels Mixing Issues; IP for DNFSB 2010-2. The attached report provides documentation ofthe basis for selection ofspecific test configurations for testing relative to assessing and establishing mixing capabilities and process limits across the range of WTP vessels (e.g., mixing power, contents Pulse Jet Mixer (plM) configuration). The documentation ofthe basis is provided for the 4, 8, and 14-foot vessels. Documentation ofthe basis for the single PlM test platform will be provided in the associated Request for Technology Development (IP Commitment 5.1.3.10). Large-Scale Integrated Mixing System Expert Review Team review comments and resolution are also included with this submittal. Ifyou have any questions, please contact me at (509) 376-6727 or your staffmay contact Ben Harp,

The article presents the results of an experimental modelling of the influence of Са2+ ion concentration and pH of a model solution on the elemental composition and sorption capacity of natural (NB) and sodium-modified (SMB-20) bentonites... more

The article presents the results of an experimental modelling of the influence of Са2+ ion concentration and pH of a model solution on the elemental composition and sorption capacity of natural (NB) and sodium-modified (SMB-20) bentonites from the Cherkasy deposit for 137Cs and 90Sr. The processes of the Cs and Sr sorption from multicomponent solutions with different pH, Eh and salt composition depend on the insoluble or sparingly soluble compounds precipitated on the bentonite surface. Based on the computer simulation data, it was found that small amounts of sediments, mainly oxides, hydroxides, Fe oxyhydroxides (hematite, goethite, limonite), and Ca carbonates (calcite, aragonite, dolomite) were present in the model solution with alkaline pH after adding CaCl2 solutions. Oxides and hydrated oxides of Fe, and calcium carbonates play an important role in the Cs and Sr sorption processes on bentonites. They can concurrently sorb radionuclides and block the sorption centres in montmorillonites. The concentration of the main structural elements (Si, Al) in the bentonites practically does not change with the increased pH and Ca2+ ion concentration in the model solution compared to the initial samples of NB and SMB-20, which indicates their structural stability. At the same time, an increase in the calcium concentration and a decrease in the sodium concentration were found in the ion-exchange complex of montmorillonite — the main bentonite mineral if compared to the initial samples. This can eventually lead to the transformation of SMB-20 bentonite from Na, Ca form to Ca, Na form. The 137Cs and 90Sr sorption on NB is shown to proceed more effectively, compared to SMB-20 in conditions of the increased pH and Ca2+ ion concentration. The results of this research may justify the bentonite clay application as a component of the isolating engineered barriers of radioactive waste disposal facilities.

BACKGROUNDCrude glycerol, a by‐product of the biodiesel production industry, was used to produce intracellular storage polymers for waste valorization. The enrichment of a mixed microbial culture (MMC) in microorganisms with the ability... more

BACKGROUNDCrude glycerol, a by‐product of the biodiesel production industry, was used to produce intracellular storage polymers for waste valorization. The enrichment of a mixed microbial culture (MMC) in microorganisms with the ability to accumulate intracellular polymers was performed in a sequencing batch reactor (SBR) submitted to feast–famine conditions. The effect of different carbon sources in the accumulation of biopolymers was investigated.RESULTSA MMC enriched in yeast and bacteria was obtained using crude glycerol as feedstock. Accumulation experiments performed with crude glycerol, synthetic glycerol and synthetic methanol showed the feasibility of the MMC to produce different biopolymers. Triacylglyceride (TAG) accumulation up to 46 wt% in yeast cells was promoted by the presence of residual lipids in crude glycerol. However, bacteria from class Betaproteobacteria used glycerol mainly to accumulate 28 wt% of polyglucose (PG) and methanol as carbon source for cell growth...

El sistema de producción porcina en cama profunda genera un residuo sólido (RCP), constituido por el estiércol y orina animal, y un material vegetal utilizado como cama. El compostaje es una tecnología factible para el tratamiento de... more

El sistema de producción porcina en cama profunda genera un residuo sólido (RCP), constituido por el estiércol y orina animal, y un material vegetal utilizado como cama. El compostaje es una tecnología factible para el tratamiento de estos residuos, generando un nuevo producto que puede sustituir funcionalmente a materiales como la turba. Cuando se reemplaza la turba por compost, se evita su uso y todos los impactos ambientales asociados a su extracción y transporte, los cuales pueden ser considerados como un crédito para las cargas del ciclo de vida del compost. El objetivo de este trabajo fue evaluar el impacto ambiental del tratamiento y valorización de distintos compost obtenidos a partir de los RCP.Instituto de Ingeniería RuralFil: Magri, Laura Ines. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Área Metropolitana de Buenos Aires.Agencia de Extensión Rural Luján; ArgentinaFil: Schein, Leila. Universidad Nacional del Luján (UNLu). Depar...