Characteristics of the Heavy Metal Content in Animal Manure Compost

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  • 家畜ふん堆肥の重金属含有量の特性
  • カチクフンタイヒ ノ ジュウキンゾク ガンユウリョウ ノ トクセイ

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The little known about the heavy metal content in animal manure compost is one of the causes preventing the spread of the use of animal manure compost. Therefore, we investigated heavy metal content in the animal manure compost produced in Kanagawa, and made clear the characteristics and relationship with other fertilizer components. The data which were used for this study were from 112 cattle manure composts, 32 pig manure composts and 83 poultry manure composts. For each of these composts, we analyzed water, nitrogen, phosphoric acid, potassium, calcium, magnesium, carbon, zinc, copper, manganese, arsenic, cadmium, mercury and lead. There were more micronutrients such as zinc, copper and manganese in pig manure compost than cattle and poultry manure compost. In general there was little environmental pollution from heavy metals such as arsenic, cadmium, mercury and lead. However, in some composts, zinc, copper, manganese and lead were contained in high concentration, and in particular cattle manure compost exceeded maximum recommended standard for sludge fertilizer and regulation value of the Fertilizer Control Law. This excess may have caused land pollution. We cannot estimate the heavy metal content in animal manure compost from other fertilizer ingredients, because there were no correlations with other ingredients. Therefore, we have to analyze it for each ingredient. The results of principal component analysis suggest that high density of heavy metal contained in the animal manure compost came from sub-materials. These days many strange materials are utilized as sub-material for the purpose of cost reduction and resource recycling. Therefore, we have to continue monitoring in order to accumulate data about heavy metal contained in animal manure compost.

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