2. Materials and methods
2.1. Preparation of adsorbent and stock solutions
Adsorbents were developed by using sludge taken from Miyamachi and Nishino DWTP in Sapporo city, Hokkaido, Japan. The sludges were collected from a sludge drying bed, a part of the processes in the DWTP to dry the sludge generated from the sedimentation tank, before the disposal to a landfill. Poly-aluminum chloride (PAC) is used as a coagulant in Miyamachi and Nishino DWTP. Especially, Nishino DWTP utilizes activated carbon to adsorb metal ions and odor compounds in the raw water so that the color of the sludge from the DWTP is black, which is different from the color of the common sludge.
2. Materials and methods2.1. Preparation of adsorbent and stock solutionsAdsorbents were developed by using sludge taken from Miyamachi and Nishino DWTP in Sapporo city, Hokkaido, Japan. The sludges were collected from a sludge drying bed, a part of the processes in the DWTP to dry the sludge generated from the sedimentation tank, before the disposal to a landfill. Poly-aluminum chloride (PAC) is used as a coagulant in Miyamachi and Nishino DWTP. Especially, Nishino DWTP utilizes activated carbon to adsorb metal ions and odor compounds in the raw water so that the color of the sludge from the DWTP is black, which is different from the color of the common sludge.
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