SEAWATER PERMEATION INTAKE APPARATUS

摘要

[Problem] To promote the generation of a biofilm required for biofiltration, or the recovery of a biofilm that has sustained damage during operation. [Solution] Provided is a seawater permeation intake apparatus (1) with which seawater that has permeated through a seabed filtration sand layer (2) and support gravel layer (3) is taken in by an intake pipe (4) that is buried in the support gravel layer (3). The apparatus is provided with a liquid injecting means (5) for injecting a liquid containing microbes or a microbe growth-promoting agent into the filtration sand layer (2), in order to promote the generation of a biofilm required for biofiltration in the filtration sand layer (2), or the recovery of a biofilm that has sustained damage. [Effect] Due to this configuration, upon initial introduction, the time needed until the function of biofiltration is exerted is dramatically curtailed as compared to the prior art. If an external factor such as a rapid change in water quality causes damage to the biofilm during operation of the filtration sand layer, early recovery of the biofilm is still possible.