Laserfiche WebLink
RINGS OF FIRE <br /> The Environmental Protection Agency has the root system of these plants. Three out <br /> spent millions of dollars on a projected 15 of four of these metals are also by- <br /> year clean-up project. products from tire fires. <br /> The safe Total Limit Concentration(TLC) The use of these types of plants can clean <br /> levels for zinc oxide is 2,000 ppm, but the soil to a depth of 10 to 20 centimeters <br /> levels of zinc oxide around 40,000 ppm (between 4 and 8 inches). The planted <br /> have been reported in a number of sites field of flowering plants would help keep <br /> and are considered hazardous waste. the contaminated soil from blowing <br /> around. <br /> Suggestions to remediate soil pollution <br /> include Knowing that zinc is used in orchards to <br /> prevent tree bark from splitting, suggests <br /> 0 Adding micro-organisms that tilling the soil and planting crops <br /> 6 Planting hyperacculmulating plants specifically to absorb heavy metals has <br /> and potential. These plants and the fruit they <br /> 0 Hauling away the soil as hazardous produce cannot be used for human <br /> waste consumption. But, the plants used on <br /> metalliferous soils can be harvested and <br /> Micro-organisms incinerated. Studies show that the ash <br /> contains up to twenty percent of metal <br /> The introduction of microbes in the soil to oxides. <br /> clean-up hydrocarbons, similar to the <br /> application on oil spills, has been Hauling Hazardous Waste <br /> suggested. Between a million and one <br /> billion bacteria occupy the intersticial Hauling the contaminated soil to <br /> spaces in one gram of soil. Certain micro- hazardous waste sites has been the <br /> organisms digest selective contaminates standard practice. The soil from the <br /> like zinc, phenols, and hydrocarbons. This Shasta College tire fire in Redding was <br /> process has not, as yet, been applied and scraped to a depth of one foot and hauled <br /> tested on tire fire sites. But, the to an approved hazardous material <br /> continued research in this area is landfill. <br /> encouraging. <br /> An engineering firm had tested soil <br /> Reclamation Using Plants samples from this site. They suggested <br /> encapsulating the soil in cement. But to <br /> Research in Great Britain has shown that review an alternative, the Department of <br /> certain plants like cress, cabbages, and Health Services required about $30,000 <br /> alyssum act as hyper-accumulators of for evaluation. <br /> heavy metals. Specifically, zinc, cadmium, <br /> nickel, and lead can be absorbed through <br /> 52 <br />