Serial waterway test in the Koishikawa River, a tributary of the Tokorogawa River, Kitami City, Hokkaido, Japan.

概要

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A serial waterway test was conducted using four water tanks containing aquatic plants, woody biomass chips containing ferment bacilli, shell-bearing clastic rocks and zeolite rocks. The first water tank (No.1) contained Phramites australis and Scirpus tabernaemontani. The woody biomass chips in the second water tank (No.2) were made from driftwood sourced from the Tokorogawa River and also disused building wood. The shell-bearing clastic rocks in the third water tank (No.3) were collected in Akan Town in Hokkaido, and the zeolite rocks in the fourth water tank (No.4) were from Tan-no Town, Kitami City in Hokkaido. The results of this serial waterway test can be summarized as follows: (1) Water tank No.1 removed PO4-P by an average of 26.3%. (2) Water tank No.2 was particularly effective for removing NH4-N, NO2-N, NO3-N and T-N, decreasing concentrations of these parameters by 52.6 to 74.1%. (3) Water tank No.3 alleviated COD by 36.0% and nitrogen by 31.3 to 73.3%. (4) Water tank No.4 removed approximately 31.5 to 49.9% of nitrogen. (5) This system was well suited for the removal of PO4-P, NH4-N, NO2-N, NO3-N, T-N, BOD, COD and specifically E. coli from the river water.
資源地質学会の論文