DETOXICATING METHOD OF CONTAMINATED SOIL

• Main Authors: TOMOGUCHI MASARU, KAMATA MASAMI, NOZAKI JUMPEI, KANZAKI MASAYA
• Format: Patent
• Language: English; Japanese
• Published: 23.02.2017
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; DISPOSAL OF SOLID WASTE; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLIDMATERIALS OR FLUIDS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROMSOLID MATERIALS OR FLUIDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; RECLAMATION OF CONTAMINATED SOIL; RECLAMATION OF CONTAMINED SOIL SOIL; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS; SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS; THEIR RELEVANT APPARATUS; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a detoxicating method of contaminated soil capable of making aggregate of the contaminated soil smaller during conducting dry type magnetic separation and further providing purified soil efficiently without using a large amount of a treatment agent without increasing weight of the treated soil.SOLUTION: There is provided a detoxicating method of contaminated soil including an iron powder addition process for adding iron powder to the contaminated soil containing at least one kind of contaminant selected from arsenic, lead, hexavalent chromium, cadmium, selenium, mercury, cyan, fluorine and boron, a water-absorbing polymer addition process for adding a water-absorbing polymer to the contaminated soil before magnetic separation and a dry type magnetic separation process for recovering and removing the iron powder form the contaminated soil to which the water-absorbing polymer is added by the dry type magnetic separation.SELECTED DRAWING: Figure 1 【課題】乾式磁選を行うときの汚染土壌の団粒を小さくすることができ、更に、大量の処理剤を使用せずに、浄化土壌が効率良く得られる上に、処理土壌の重量が多くならない、汚染土壌の無害化処理方法の提供。【解決手段】砒素、鉛、六価クロム、カドミウム、セレン、水銀、シアン、フッ素及びほう素から選択される少なくとも１種の汚染物質を含む汚染土壌に対して鉄粉を添加する鉄粉添加工程と、磁選前の汚染土壌に吸水性ポリマーを添加する吸水性ポリマー添加工程と、前記吸水性ポリマーを添加された汚染土壌から鉄粉を乾式磁選により回収除去する乾式磁選工程と、を含む汚染土壌の無害化処理方法である。【選択図】図１