In Situ Soil Flushing - Studies on Remediation Efficiency of Polluted Sandy Soils With Organic Acids

Abstract

Techniques for the treatment of polluted soils have as main objective the destruction, elimination or immobilization of pollutants. In situ soil flushing, which is based on the extraction of contaminants from the soil with water or other proper aqueous solutions is carried out by the permeation of the extraction fluid through soil layers. In this paper, an experimental setup was exploited for soil remediation based on the principle of in situ soil flushing for ensuring a high efficiency of treatment. Correlations were identified among soil properties that influence the treatment process, structural characteristics of the installation of remediation and operating parameters. The theoretical and experimental research of the soil depollution process presented in this paper constitutes an attempt to offer, by means of detailed analysis, constructive and functional dependences, which can set the basis for the design of new depollution technologies or modernization of the older systems.

Influence of Fertilizers on Soils Used for Oleaginous Crop

“…To maximize their productive potential, cultivated plants need adequate amounts of water, light, carbon dioxide and mineral nutrients (nitrogen, phosphorus, potassium, calcium, magnesium, sulphur and several microelements) [1][2][3][4][5][6][7][8][9]. Soil is the main source of mineral nutrients and water for plants.…”

Influence of Soil Fertilization Systems on Chemical Properties of the Soil

“…The lowest values of the metal content in soil (aluminium) have been recorded for wheat experimental variantfertilized with azote and phosphorous N90P75 (154.8 mg/kg d.m. ).Chlorine have the highest content in soil (31.02 mg/100 g soil, 15-30 cm working depth, parcel fertilized with azote 90 kg N/ha) in comparation with the other chemical properties of the soil (content of magnesium, aluminium, potassium, calcium and iron).A fertilizer can be a natural or synthetic product, of a mineral and/or organic nature, simple or complex, which is applied in liquid, semi-fluid or solid form to the soil, to the surface, or foliar for the purpose of increasing soil fertility and ensuring development and normal plant growth [1][2][3][4][5][6][7][8][9][10][11].Mineral fertilizers with nitrogen have a high solubility and have the quality of being able to provide almost all the necessary nutrients to the plants in a form that allows their direct and easy absorption. Another important advantage of mineral chemical fertilizers is that they allow their association and application with organic or green fertilizers [12][13][14][15][16][17][18][19][20][21][22].Mineral fertilizers with phosphorus have much lower solubility (10-20% in the first year of application in the case of phosphorus and 30-40% for potassium), accumulating in the colloidal mineral formations of the soil, then being blocked in the form of heavy phosphates soluble in calcium, magnesium, iron and aluminium [12,16,19,21,[23][24][25][26][27][28][29].Animal production is developed in individual farms and in large livestock farms.…”

“…A fertilizer can be a natural or synthetic product, of a mineral and/or organic nature, simple or complex, which is applied in liquid, semi-fluid or solid form to the soil, to the surface, or foliar for the purpose of increasing soil fertility and ensuring development and normal plant growth [1][2][3][4][5][6][7][8][9][10][11].…”

The Effect of Biochar Mixed with Compost on Heavy Metal Concentrations in a Greenhouse Experiment and on Folsomia Candida and Eisenia Andrei in Laboratory Conditions

“…Though sewage sludge is a valuable source of phosphorus, nitrogen, micronutrients and organic matter that can positively influence soil properties and plant productivity. The heavy metal content may be a constraint for application of sewage or sludge for soil remediation [5][6][7][8][9].…”