FLOCCULATION AND DEHYDRATION CONTROL DURING SOIL WASHING PROCESS USING SOIL PLASTICITY INDEX AND pH

2006 ◽  
Vol 62 (3) ◽  
pp. 359-368
Author(s):  
Hirokazu AKAGI ◽  
Mitsuo MOURI ◽  
Masashi TANAKA ◽  
Seiichi ISHIDA
Keyword(s):  
Soil Washing ◽  
Plasticity Index ◽  
Soil Plasticity ◽  
Washing Process

Anaerobic treatment of soil wash fluids from a wood preserving site

1998 ◽  
Vol 38 (7) ◽  
pp. 63-72 ◽  
Author(s):  
K. M. Miller ◽  
M. T. Suidan ◽  
G. A. Sorial ◽  
A. P. Khodadoust ◽  
C. M. Acheson ◽  
...  
Keyword(s):  
Soil Washing ◽  
Anaerobic Treatment ◽  
Integrated System ◽  
Waste Stream ◽  
Adsorptive Capacity ◽  
Anaerobic Conditions ◽  
Washing Process ◽  
Polycyclic Aromatic ◽  
Treatment Technologies ◽  
Solvent Washing

An integrated system has been developed to remediate soils contaminated with pentachlorophenol (PCP) and polycyclic aromatic hydrocarbons (PAHs). This system involves the coupling of two treatment technologies, soil solvent washing and anaerobic biotreatment of the extract. Specifically, this study evaluated the effectiveness of the granular activated carbon (GAC) fluidized-bed reactor to treat a synthetic waste stream of PCP and four PAHs (naphthalene, acenaphthene, pyrene, and benzo(b)fluoranthene) under anaerobic conditions. This waste stream was intended to simulate the wash fluids from a soil washing process treating soils from a wood preserving site. The reactor achieved a removal efficiency of greater than 99.8% for PCP with conversion to its dechlorination intermediates ranging from 47% to 77%. Effluent, carbon extraction, and isotherm data also indicate that naphthalene and acenaphthene were removed from the liquid phase with efficiencies of 86% and 93%, respectively. Effluent levels of pyrene and benzo(b)fluoranthene were extremely low due to the adsorptive capacity of GAC for these compounds. Experimental evidence does not suggest that these compounds were chemically transformed within the reactor.

Application of an electrochemical treatment for EDDS soil washing solution regeneration and reuse in a multi-step soil washing process: Case of a Cu contaminated soil

2015 ◽  
Vol 163 ◽  
pp. 62-69 ◽  
Author(s):  
Alberto Ferraro ◽  
Eric D. van Hullebusch ◽  
David Huguenot ◽  
Massimiliano Fabbricino ◽  
Giovanni Esposito
Keyword(s):  
Contaminated Soil ◽  
Soil Washing ◽  
Electrochemical Treatment ◽  
Washing Process

scholarly journals Logistical Simulation Modeling for Planning a Soil Remediation Process

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
David Kessel ◽  
Jihan Jeon ◽  
Jaeyeon Jung ◽  
Eutteum Oh ◽  
Chang-Lak Kim
Keyword(s):  
Simulation Model ◽  
Soil Remediation ◽  
Nuclear Power ◽  
Power Plants ◽  
Discrete Event ◽  
Soil Washing ◽  
Batch Process ◽  
Washing Process ◽  
Plant Operations ◽  
Remediation Process

This paper describes the development of a discrete event simulation model using the FlexSim software to support planning for soil remediation at Korean nuclear power plants that are undergoing decommissioning. Soil remediation may be required if site characterization shows that there has been radioactive contamination of soil from plant operations or the decommissioning process. The simulation model was developed using a dry soil separation and soil washing process. Preliminary soil data from the Kori 1 nuclear power plant was used in the model. It was shown that a batch process such as soil washing can be effectively modeled as a discrete event process. Efficient allocation of resources and efficient waste management including volume and classification reduction can be achieved by use of the model for planning the soil remediation process. Cost will be an important criterion in the choice of suitable technologies for soil remediation but is not included in this conceptual model.

scholarly journals Optimizing soil washing remediation of mercury contaminated soil using various washing solutions and solid/liquid ratios

2020 ◽  
Vol 148 ◽  
pp. 05004
Author(s):  
Agus Jatnika Effendi ◽  
Vina Lestari ◽  
Mohammad Irsyad
Keyword(s):  
Distribution Coefficient ◽  
Potassium Iodide ◽  
Contaminated Soil ◽  
Soil Washing ◽  
Mercury Contamination ◽  
Small Scale ◽  
Gold Extraction ◽  
Washing Process ◽  
Fractionation Analysis ◽  
Solid Liquid

Most of the artisanal and small-scale gold miners in Indonesia as in the case of those who are in Banten Province, still use the amalgamation process in the gold extraction process. Therefore, mercury contamination could not be avoided. As a result, it was found that the concentration of mercury-contaminated soil in Lebak, Banten Province was detected as high as 136,9 mg/kg. Since the contamination process occurred for a long time, making the formation and mobility of complex mercury in soil increased by time. Soil washing is one remediation technology that can be applied in the recovery of mercury-contaminated soil. This study aims to determine the optimum conditions of the soil washing process: effect of pH, the concentration of washing solutions and ratio of solid/liquid. Furthermore, the value of the distribution coefficient, desorption of mercury in the soil and fractionation of mercury in the soil were also observed. Potassium Iodide was found to be the best washing solution among others used in this study. The optimum condition was obtained at pH 2, the concentration of washing solution at 0.25 M and the solid/liquid ratio of 1:15. Under these conditions, mercury desorption efficiency reached 86.9% with the value of the distribution coefficient of 0.185. Mercury fractionation analysis in the contaminated soil showed that the mobile > semi-mobile > non-mobile fractions. Potassium iodide was able to desorb at about 84% of mobile fractions, 97% of semi-mobile and 25% non-mobile mercury.

Removal of Al, Fe and Mn by Pistia stratiotes L. and its stress response

2012 ◽  
Vol 7 (6) ◽  
pp. 1037-1045 ◽  
Author(s):  
Tomáš Veselý ◽  
Lukáš Trakal ◽  
Marek Neuberg ◽  
Jiřina Száková ◽  
Ondřej Drábek ◽  
...  
Keyword(s):  
Amino Acids ◽  
Tartaric Acid ◽  
Free Amino Acids ◽  
Free Amino ◽  
Soil Washing ◽  
Toxic Element ◽  
Pistia Stratiotes ◽  
Washing Process ◽  
Fe And Mn ◽  
High Level

AbstractThe influence of different chelates applied in the soil primary on Al and secondary on Fe and Mn mobilization and their removal from solution was investigated. The work compared the efficiency of 10 mM tartaric acid and 3 mM EDTA in soil washing process and accumulation potential of Pistia stratiotes in rhizofiltration process. The plant response on the toxic element Al and other elements Fe and Mn was determined through the nitrogen and free amino acids content in plants. The efficiency of chelates decreased in order 10 mM tartaric acid > deionized water > 3 mM EDTA for all studied elements. P. stratiotes was able to remove up to 90% of elements during the 15 days period. Higher content of toxic element Al and potential toxic elements Fe and Mn were observed in the roots than in the leaves with the increased time. The trend of Al accumulation correlated with Fe accumulation (R2=0.89). Toxicity impact of high level of Al was observed by increased free amino acids (AA) level. Proline, histidine, glutamic acid and glycine were the most synthesised free AA in leaves. Total AA content in leaves was significantly higher under chelates addition compared to control.

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