| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To achieve appropriate and efficient cleaning treatment by efficiently screening soil contaminated with a heavy metal or the like into portions having high and low contamination concentration. <P>SOLUTION: The coarse-grained particle of contaminated soil is separated by a sieve shaker 1, and the contamination concentration of the fine-grained particle due to metal is detected by a fluorescent X-ray analysis apparatus 3 during transport by a belt conveyor 2. A control apparatus 7 discriminates the soil into a portion having high contamination concentration and a portion having low contamination concentration based on the contamination concentration, and controls the opening/closing of a solenoid valve 6b that a transport path-switching apparatus 6 has, thus feeding the soil having high contamination concentration into a belt conveyor 4 for contaminated soil due to pressurized air from the transport path-switching apparatus 6, and causing the soil having low concentration to fall on the belt conveyor 5 for clean soil since the injection of the pressurized air is stopped for transporting to each separate location. By removing the coarse-grained particle from the entire soil and the fine-grained particle having low contamination concentration from the entire soil, the soil to be cleaned can be reduced. <P>COPYRIGHT: (C)2003,JPO</p> |
