Abstract
Deposition rate of sludge on the riverbank of the Kyobashi river (a branch river of the Ota river) is about 1 cm per year, leading to the large amounts of sludge on the riverbank which exacerbate both substratum and water environments of the river. To date, we have proposed some methods using granulated coal ash (GCA), which is alkaline granulated material (AGM) for recovering the environments. Here, we aim at evaluating organic properties of the sludge remediated by AGM. For this purpose, measurements of organic elements, ignition behavior, pH, ORP, oxygen consumption, and n-hexane extract of the sludge were conducted, and relationships between these parameters were used. It was confirmed that GCA mollified the reduction level of the sludge, and improved the mobility of pore water. The results also ensured that the substratum and water environments were improved after applying GCA.
