土壌中に含まれる重金属の林産廃棄物による収着 : 木粉,樹皮または製紙カスによる収着

Removal of heavy metals from the polluted soil by the use of forest product wastes was studied. Wood flour and bark powder available from saw dust or blocks of several species of wood, and powder of paper mill waste were prepared for the tests. All of the samples tested in this study took up a considerable quantity of cadmium, copper or lead from the metal solutions. Two g of each sample were mixed with 10 g of the polluted paddy soil, and the mixture were shaken with 20 ml of water for 180 min. Twenty hours after the shaking, the mixture was separated into 3 parts, that is, the sample, the paddy soil and the super natant fluid, and the heavy metal content in each part was determined using an atomic absorption spectrophotometer. Under this experimental conditions, the tested sample took up the metals even from the paddy soil, and the metal content remaining in the paddy soil decreased gradually by the repeat of the mixing with fresh forest product wastes.