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language
eng
Author
Wakatsuki , Toshiyuki
Iwashima, Noriko
Description
Multi-soil-layering (MSL) wastewater treatment systems consist of soil units (soil mixture blocks, SMB) arranged in a brick-like pattern surrounded by permeable layers of zeolite or alternating particles of homogeneous sizes that allow for a high hydraulic loading rate. This study evaluated the performances of MSL systems that have been operating for 17 to 20 years in small rural communities. Even though 20 years had passed since this system was installed, high organic matter treatment performance continued. Nitrogen removal was higher than with conventional soil systems. Two of the MSL systems continued to show high phosphorus removal performances, whereas in the third system, the adsorbing capacity was relatively low, requiring further investigation. Treatment performances were largely dependent upon the structure of the MSL systems. It appeared that improving the structure to enhance the contact efficiency between the wastewater and the soil in SMB was important for enhancing treatment performances. The combined use of existing wastewater treatment systems with the MSL system was effective for preventing environmental pollution over a long period.
Journal Title
Applied and Environmental Soil Science
Volume
2019
Published Date
2019-1-23
DOI
Publisher
Hindawi
NII Type
Journal Article
Format
PDF
Text Version
出版社版
Gyoseki ID
e35744
e35544
OAI-PMH Set
Faculty of Life and Environmental Science