Evaluation of oil and salt effects on food waste composting and plant growth

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  • 食品廃棄物コンポストに由来する油分および塩分がコマツナの生育に及ぼす影響
  • ショクヒン ハイキブツ コンポスト ニ ユライスル ユブン オヨビ エンブン ガ コマツナ ノ セイイク ニ オヨボス エイキョウ

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Abstract

China's continuous rapid economic growth has also spawned a detrimental environmental pollution. The rapid growth caused many changes; expansion of urban areas, urbanization of rural areas, high population density in urban areas. Enhancement of quality of life has been lead the increasing of food waste in municipal solid waste (MSW), but waste treatment infrastructure has not developed in China. Then, there are waste dump in many places, which is a threat to the health of people living nearby and the environment.In China composting is one of the suitable methodｓ for food waste recycling. But, food wastes content oil and salt in wide range depending on the ingredients. There is a possibility that excessive oil and salt could be an inhibitor not only for food waste composting but also for applied plant growth. This study is aimed to demonstrate the effect of oil and salt to food waste composting, and the effect of its compost to the plant Brassica rapa var. peruviridis growth. Food waste samples were taken from university cafeteria, after added oil; from 0 to 36%(dried weight material) and salt; from 0 to 8%(dried weight material) to well mixed food waste samples, put into composting equipment “Kaguyahime” for composting, and analyzed for chemical properties, and used for plant tests. It was found that food waste could contain 36% (dried weight material) of oil for composting. Moreover, the produced compost, containing less than 36% (dried weight material) of oil in food waste material, didn’t inhibit plant growth. Meanwhile, salt could be contained in food waste up to 8% (dry weight material) for composting, and its compost could be applied continuously to soil 1t/10a/y without phytotoxic effects.

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