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    • 10. 发明专利
    • METHOD AND EQUIPMENT FOR PREVENTING HARMFUL SUBSTANCE FROM PENETRATING INTO GROUND
    • JPH08192146A
    • 1996-07-30
    • JP316795
    • 1995-01-12
    • HITACHI LTDHITACHI PLANT ENG & CONSTR CO
    • FUNABASHI KIYOMIKUROKAWA HIDEAKIFUKAZAWA TETSUOYAMAZAKI TADASHI
    • G21F9/12B01J20/12B01J20/34C02F1/28
    • PURPOSE: To prevent the lowering of the adsorbing and removing capacity of a harmful substance of an adsorbing material, in an apparatus for preventing a harmful substance from penetrating into the ground, by laminating a plurality of adsorbing material beds so as to separate them and measuring the concn. of the harmful substance between the adsorbing material beds and regenerating the adsorbing material beds when the concn. reaches a predetermined value. CONSTITUTION: Upper and lower adsorbing material beds 1, 2 are formed between strata 6, 7 and coarse particle beds 3-5 are embedded. The concn. of the harmful substance transmitted through the adsorbing material bed 1 is measured by the harmful substance densitometer 21 of a treatment well 11 and, at a point of time when the concn. reaches a predetermined value, a regeneration soln. is injected into the coarse particle bed 4 from the treatment well 1 by a regeneration soln. injection device 22 to regenerate the adsorbing material bed 1. At this time, the generated regeneration soln. is discharged from a discharge well 12 by a regeneration soln. discharging and purifying device 23. Subsequently, the concn. of the discharged regeneration soln. is measured by the harmful substance densitometer 21 and, at a point of time when the concn. reaches the predetermined value or less, the injection of the regeneration soln. is stopped and clean water is injected from the treatment well 11 to remove the remaining regeneration soln.