抄録
Two serial waterway tests, one with aeration and one without aeration, were conducted using three water tanks containing zeolite rocks, shell-bearing clastic rocks and woody biomass chips. The zeolite rocks in the first water tank (No.1) originated from Tan-no Town, Kitami City in Hokkaido, and the shell-bearing clastic rocks in the second water tank (No.2) were collected from Akan Town, Kushiro City in Hokkaido. The woody biomass chips in the third water tank (No.3) were produced from driftwood sourced from the Tokorogawa River and also disused building wood.
The results of these serial waterway tests with and without aeration can be summarized as follows:
(1) Both methods were well suited for the removal of PO4-P, NH4-N, NO2-N, NO3-N, T-N, BOD, COD and E. coli from river water.
(2) Average purification percentages for PO4-P, NH4-N and NO2-N in tank No.1 of aeration tests were lower than those observed in non-aeration tests.
(3) Average purification percentages for NH4-N, NO2-N, NO3-N and T-N in tank No.2 of aeration tests were higher than those observed in non-aeration tests.
(4) Average purification percentages for PO4-P, NH4-N, NO3-N and T-N in tank No.3 of aeration tests were lower than those observed in non-aeration tests.
(5) Average purification percentages for NO2-N, NO3-N, T-N and COD in aeration tests were higher than those observed in non-aeration tests.
(6) Average purification percentages for PO4-P, NH4-N, BOD and E.coli in non-aeration tests were higher than those observed in aeration tests.
