title: Risks and benefits of compost-like materials prepared by the thermal treatment of raw scallop hepatopancreas for supplying cadmium and the growth of alfalfa (Medicago sativa L.).
abstract: Scallop hepatopancreas, fishery waste, contains relatively high levels of Cd and organic nitrogen compounds, the latter of which represent a fertilizer. In this study, raw scallop hepatopancreas tissue was thermally treated with sawdust and red loam in the presence of an iron catalyst to produce compost-like materials (CLMs). Two CLM samples were prepared by varying the content of raw scallop hepatopancreas tissue: 46 wt.% for CLM-1 and 18 wt.% for CLM-2. Mixtures of control soil (CTL) and CLMs (CLM content: 10 and 25 wt.%) were examined for the growth of alfalfa (Medicago sativa L.) to evaluate the risks and benefits of using this material for fertilization. The Cd content in shoots and roots of alfalfa, that were grown in the presence of CLMs, was significantly higher than those for the plants grown in the CTL, indicating that Cd had accumulated in the plants from CLMs. The accumulation of Cd in the alfalfa roots was quite high in the case of the 25% CLM-1 sample. However, alfalfa growth was significantly promoted in the presence of 10% CLM-1. This can be attributed to the higher levels of nitrogen and humic substances, which serve as fertilizer components. Although the fertilization effect in case of CLM-1showed a potential benefit, the accumulation of Cd in alfalfa was clearly increased in the presence of both CLMs. In conclusion, the use of CLMs produced from raw scallop hepatopancreas tissue can be considered to have a desirable benefit from standpoint of its use as fertilizer, but is accompanied by a risk of the accumulation of Cd in alfalfa plants.
authors.affiliation: a Laboratory of Chemical Resources, Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University , Sapporo , Hokkaido , Japan.
authors.forename: Kensuke
authors.initials: K
authors.lastname: Ushijima
authors.affiliation: a Laboratory of Chemical Resources, Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University , Sapporo , Hokkaido , Japan.
authors.forename: Masami
authors.initials: M
authors.lastname: Fukushima
authors.affiliation: b Daiso-KET Institute Corporation , Asahikawa , Hokkaido , Japan.
authors.forename: Shinya
authors.initials: S
authors.lastname: Kanno
authors.affiliation: b Daiso-KET Institute Corporation , Asahikawa , Hokkaido , Japan.
authors.forename: Itoko
authors.initials: I
authors.lastname: Kanno
authors.affiliation: c Plan Policy Section, Shibetsu-Town Government Office , Shibetsu , Hokkaido , Japan.
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Ohnishi
mesh_terms: D000818:Animals; D002104:Cadmium / Q000493:pharmacokinetics / Q000633:toxicity*; D002384:Catalysis; D005308:Fertilizers; D043143:Hepatopancreas / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D000455:Medicago sativa / Q000187:drug effects / Q000254:growth & development* / Q000378:metabolism; D049897:Pectinidae / Q000737:chemistry*; D018517:Plant Roots / Q000187:drug effects / Q000378:metabolism; D018520:Plant Shoots / Q000187:drug effects / Q000378:metabolism; D018570:Risk Assessment; D012987:Soil; D012989:Soil Pollutants / Q000493:pharmacokinetics / Q000633:toxicity; D018505:Waste Management / Q000379:methods*; D014866:Waste Products
chemical_list: D005308:Fertilizers; D012987:Soil; D012989:Soil Pollutants; D014866:Waste Products; D002104:Cadmium; D007501:Iron
keywords: Scallop hepatopancreas; alfalfa; cadmium; compost-like materials; fertilization; humic substances