| 摘要 |
PROBLEM TO BE SOLVED: To effectively promote the propagation of contaminant decomposing bacteria and to efficiently clean the contaminated soil by incorporating a slowly available nitrogenous fertilizer, protein and a clay mineral to prepare an aq. composition for biologically restoring the contaminated soil. SOLUTION: An aq. composition effective to clean the soil contaminated with the oil leaked from a gas station, etc., is formed by incorporating a slow- release nitrogenous fertilzer, protein and a clay mineral. IB urea, CDV urea, uraform, guanyl urea phosphate, oxamide, coated urea, etc., are exemplified as the slowrelease nitrogenous fertilizer. Casein, gelatin, collargen, keratin, albumin, ceresin, sein, etc., are exemplified as the protein, and zeolite activated clay, bentonite, diatomaceous earth, etc., are used as the clay mineral. Mineral oil, animal and vegetable oil and poisonous chemical substance, etc., are exemplified as the contaminant, and the aq. composition is directly sprayed on the soil contaminated with the contaminant to clean the contaminated soil.
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