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No.39 (1992/12) >

 
Title :沖縄島における浄水汚泥の主要構成成分と理化学性(生産環境学科)
Title alternative :The main constituents and physical and chemical properties of water filtering sludge in Okinawa island (Department of Environmemtal Sciences and Technology)
Authors :渡嘉敷, 義浩
親富祖, 明
志茂, 守孝
Authors alternative :Tokashiki, Yoshihiro
Oyafuso, Akira
Shimo, Moritaka
Issue Date :1-Dec-1992
Abstract :農業用客土資材として有効利用するために,沖縄島の石川,北谷,コザ,西原の各浄水汚泥の主要構成成分と理化学性とを調べ,さらに県内の代表的耕地土壌の理化学性とも比較した。得られた結果は,次のように要約することができる。1)一次鉱物はいずれも石英が主体で,その他に石川汚泥では長石,コザ汚泥では方解石が附随した。二次鉱物はいずれもカオリナイトやイライトが主体で,それらの他にバーミキュライトークロライト中間種鉱物が附随した。石川および北谷汚泥ではゲーサイトも随伴した。2)有機物含量は約5∿16%で,いずれも耕地土壌の約2%より高かった。3)土性は一般に粘土含量が高く,西原汚泥で砂含量,コザ汚泥でシルト含量がそれぞれ高かった。4)pH(H_2O)はいずれも弱アルカリ性を示し,全窒素含量はいずれも耕地土壌より倍以上高かった。5)CECは約5∿16me/100gを示した。交換性Ca含量は約7∿53me/100gで,いずれも酸性土壌の国頭マージよりかなり高かった。6)可給態リン酸含量は西原汚泥で約7∿8mg/100gで,他の汚泥より17倍以上も高かった。リン酸吸収係数は約2,400∿2,700mg/100gで,耕地土壌より3∿5倍も著しく高い値を示した。以上のことから,浄水汚泥の資材特性は耕地土壌に対して全体的には優るものが多く,農業用客土資材として有効利用できる可能性が高いと考えられる。
For the purpose of effective using the water filtering sludge as a soil dressing material in Okinawa island, the sludges which were collected from Ishikawa, Chatan, Koza and Nishihara water purification plant were studied on the main constituents and physical and chemical properties. And furthermore these properties of the sludge were compared with these of arable soils. The results are summarized as follows. 1) The primary mineral of the sludges was mainly consisted of quarts accompanied by a small amount of feldspars in Ishikawa's and calcite in Koza's sludge. In the clay fraction the sludges included kaolinite and illite as the main minerals accompanied by a moderate amount of vermiculite-chlorite intergrade, in addition, goethite in both Ishikawa's and Chatan's sludge. 2) It was contained about 5 to 16% in organic matter which was higher than 2% in arable soils. 3) The texture was clayey in both Ishikawa's and Chatan's, sandy in Nishihara's and silty in Koza's sludge, respectively. 4) The sludges showed slightly alkaline reaction, and their total nitrogen were higher twice than this in arable soils. 5) The CEC was about 5 to 16me/100g. The value for exchangeable calcium was about 7 to 53me/100g and was considerably higher in the sludges than this in acidic Kunigami mahji soil. 6) The value for available phosphate was about 7 to 8mg/100g in Nishihara's sludge and the value was larger 17 times than this in the other sludge. The phosphorus absorption coefficient was about 2,400 to 2,700mg/100g and the value was considerably higher 3 to 5 times than this in arable soils. From the results of these expriments, it was considered that it will be possible to use the sludge effectively as a soil dressing material in Okinawa island because the physical and chemical properties of the sludges were better on the whole than these in arable soils.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3812
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.39 p.85 -95
Appears in Collections:No.39 (1992/12)

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