Engineering Materials for the Recovery of the Natural Purification Actions

It may be possible to recover the qualities of seawater and sediments using the natural purification actions. This means that the breeding of microorganism and seaweed is needed in coastal regions. Therefore, this study examines two materials for the recovery of the natural purification actions, and also a filtering-vessel for purification of seawater. The results are as follows; 1) Carbon fiber was used to promote the breeding of microorganism and phytoplankton, etc. The COD was decreased by the biological actions and a large amount of P and Fe was absorbed in the bunch of carbon fiber. Many kinds of seaweed were also found on the bunch of carbon fiber. 2) Steel slag was used to control the amounts of H2S and P from the sediments. Steel slag can also be used as ground base for seaweeds. 3) A full-scale filtering vessel was used to clean up seawater. The COD and SS were effectively removed from the seawater.