内容 |
ノート |
巻 |
25巻2/3号2020年
|
Page |
88
|
題名 |
下水道資源を用いた固化肥料による海域施肥の基礎的検討
|
Title |
Ocean Fertilization Using Solidified Sewage Resources : A Basic Study |
著者 |
宮本豊尚,重村浩之 |
Authors |
Toyohisa Miyamoto, and Hiroyuki Shigemura |
著者表記 |
国立研究開発法人土木研究所 |
著者表記(英) |
National Research and Development Agency Public Works Research Institute |
著者勤務先名 |
|
Office name |
|
著者所属名 |
|
キーワード |
海域施肥,全窒素,溶出試験,ワイブル分布 |
Key Words |
ocean fertilization, total nitrogen, leaching test, the Weibull distribution |
概要 |
栄養塩不足等の要因により水産資源への影響が問題となる海域が存在しており,大型藻類に対する施肥技術の検討が実施されている。そこで下水道資源を用いた固化肥料による海域施肥効果を検討するため溶出試験を行い,ワイブル分布の累積分布関数で溶出現象を近似し,溶出速度に与える影響を求めた。超純水と塩化ナトリウム水溶液を溶媒として試験を行ったが,溶出には大きな差はみられなかった。また寒天で固化すると,最終的な溶出量には差がみられなかった一方で,溶出速度を大幅に抑制し,相対的に長期間溶出が継続した。 |
Abstract |
There are areas in the sea where it has been suggested that a lack of nutrients are affecting marine resources. Thus, fertilization techniques are being developed for seaweeds. This study aimed to examine the effect of solid fertilization with sewage resources. The cumulative distribution function of the Weibull distribution was used to estimate leaching rates. Leaching tests were performed using ultrapure water and an aqueous solution of sodium chloride as the solvent, but no significant differences were observed in the leaching tests. Solidification using agar suppressed the leaching rate without affecting the final amount of leaching. Assuming that the leaching rate affects the concentration of the solvent, leaching rates were calculated using the Weibull probability density function, and they were found to be 102-104 g-N/m2/day, excluding compost and without additional processing. |