BIOLOGICAL CLEANING METHOD AND APPARATUS FOR POLLUTED SOIL

摘要

PROBLEM TO BE SOLVED: To provide a biological cleaning method and an apparatus for contaminated soil capable of controlling ventilation according as degradation activity of microorganisms. SOLUTION: An oxygen analyzer 5 is disposed in the contaminated soil S and a decrease rate (δ[O2]/δt) of residual oxygen concentration [O2] is measured by using the oxygen analyzer 5. The contaminated soil S is cleaned while the ventilation volume into the contaminated soil S is controlled in accordance with the decrease rate (δ[O2]/δt). The oxygen consumption C02in the contaminated soil S is calculated from the decrease rate (δ[O2]/δt) of residual oxygen concentration [O2] and the soil air volume VSPACE of the contaminated soil S and the ventilation volume into the contaminated soil S is controlled in accordance with the oxygen consumption C02. Further preferably, a thermometer 6 is disposed in the contaminated soil S and a soil temperature TSOIL is measured by using the thermometer 6. The ventilation into the contaminated soil is then controlled in accordance with the oxygen consumption C02and the soil temperature TSOIL. The ventilation volume is preferably controlled by each of respective areas by disposing the oxygen analyzers 5 and/or the thermometers 6 into a plurality of the areas of the contaminated soil S. COPYRIGHT: (C)2004,JPO