Abstract
In order to examine problems involved in the utilization as fertilizer of sludge produced in the purification of public water supplies, the physicochemical properties of the sludge as well as the manner of decomposition of the fertilizer components in the sludge were investigated. Physicochemical analysis of the sludge composition. survey of the composition change by microorganisms in the soil, and tests of crop growth were carried out. As regards physicochemical analysis. the sludge was nearly identical with the average type of Japanese soil, and except slightly high content of zinc material, the content of other heavy metals was below the limits of detection, indicating the sludge is adequately safe. As regards fertilizer components, adverse effects on the growth of plants resulting primarily from excessive nitrogen content were feared to be possible. The total carbon contents behavior with respect to organic versus inorganic nitrogen as well as phosphorus, and also the growth of plants in the mixed soil were studied. These tests indicated that the application of the sludge in a mixed ratio of 50 % is optimal. Therefore, it was concluded that the sludge was effective as a soil improvement agent, namely fertilizer. 7 refs., 14 figs., 5 tabs.
Oki, T;
Sekine, H;
[1]
Iinuma, K;
Otagiri, S
[2]
- Nihon University, Tokyo (Japan). College of Industrial Technology
- Kofu Water Supply Bureau, Yamanashi (Japan)
Citation Formats
Oki, T, Sekine, H, Iinuma, K, and Otagiri, S.
Physicochemical properties of sludge and its effectiveness as soil-additive.
Japan: N. p.,
1992.
Web.
Oki, T, Sekine, H, Iinuma, K, & Otagiri, S.
Physicochemical properties of sludge and its effectiveness as soil-additive.
Japan.
Oki, T, Sekine, H, Iinuma, K, and Otagiri, S.
1992.
"Physicochemical properties of sludge and its effectiveness as soil-additive."
Japan.
@misc{etde_10125633,
title = {Physicochemical properties of sludge and its effectiveness as soil-additive}
author = {Oki, T, Sekine, H, Iinuma, K, and Otagiri, S}
abstractNote = {In order to examine problems involved in the utilization as fertilizer of sludge produced in the purification of public water supplies, the physicochemical properties of the sludge as well as the manner of decomposition of the fertilizer components in the sludge were investigated. Physicochemical analysis of the sludge composition. survey of the composition change by microorganisms in the soil, and tests of crop growth were carried out. As regards physicochemical analysis. the sludge was nearly identical with the average type of Japanese soil, and except slightly high content of zinc material, the content of other heavy metals was below the limits of detection, indicating the sludge is adequately safe. As regards fertilizer components, adverse effects on the growth of plants resulting primarily from excessive nitrogen content were feared to be possible. The total carbon contents behavior with respect to organic versus inorganic nitrogen as well as phosphorus, and also the growth of plants in the mixed soil were studied. These tests indicated that the application of the sludge in a mixed ratio of 50 % is optimal. Therefore, it was concluded that the sludge was effective as a soil improvement agent, namely fertilizer. 7 refs., 14 figs., 5 tabs.}
place = {Japan}
year = {1992}
month = {Jun}
}
title = {Physicochemical properties of sludge and its effectiveness as soil-additive}
author = {Oki, T, Sekine, H, Iinuma, K, and Otagiri, S}
abstractNote = {In order to examine problems involved in the utilization as fertilizer of sludge produced in the purification of public water supplies, the physicochemical properties of the sludge as well as the manner of decomposition of the fertilizer components in the sludge were investigated. Physicochemical analysis of the sludge composition. survey of the composition change by microorganisms in the soil, and tests of crop growth were carried out. As regards physicochemical analysis. the sludge was nearly identical with the average type of Japanese soil, and except slightly high content of zinc material, the content of other heavy metals was below the limits of detection, indicating the sludge is adequately safe. As regards fertilizer components, adverse effects on the growth of plants resulting primarily from excessive nitrogen content were feared to be possible. The total carbon contents behavior with respect to organic versus inorganic nitrogen as well as phosphorus, and also the growth of plants in the mixed soil were studied. These tests indicated that the application of the sludge in a mixed ratio of 50 % is optimal. Therefore, it was concluded that the sludge was effective as a soil improvement agent, namely fertilizer. 7 refs., 14 figs., 5 tabs.}
place = {Japan}
year = {1992}
month = {Jun}
}