SOIL WASHING SYSTEM

摘要

A soil cleaning system is provided to clean effectively contaminated soil by separating soil contaminated with oils and/or heavy metals according to particle sizes of the soil and improving a degree of contact between the contaminated soil and cleaning water. A soil cleaning system comprises a combination of a pressurized dissolved air generating apparatus, a cleaning agent storage tank, a pre-treatment apparatus, a soil cleaning apparatus(200), and a post-treatment apparatus. The soil cleaning apparatus includes: a chamber(201) that forms a cleaning space of contaminated soil; sieve type soil guide plates(210,220,230) which are vertically arranged in the chamber and have openings with different sizes; and pressurized dissolved air ejection nozzles(106) and mixing spray nozzles formed on an upper part of each of the soil guide plates. The cleaning agent storage tank is consisted of a first cleaning agent storage tank for storing a first cleaning agent and a second cleaning agent storage tank for storing a second cleaning agent, the mixing spray nozzles include first and second mixing spray nozzles(107,108), pipes of the first and second cleaning agent storage tanks are respectively connected to a dissolved air pipe of the pressurized dissolved air generating apparatus to mix the first and second cleaning agents with pressurized dissolved air, and a first cleaning agent mixture of the first cleaning agent and the pressurized dissolved air and a second cleaning agent mixture of the second cleaning agent and the pressurized dissolved air are sprayed into the soil cleaning apparatus through the first and second mixing spray nozzles.