| 摘要 |
A separator for separating hydrocarbons from surface water before entering a drainage system comprises a filter unit 6 and housing mounted upon an upper section of a sedimentation tank 3. The filter unit comprises a pipe 7, projecting from the lower portion of the housing and into the tank. Surface water enters the housing via inlet 17 passes through a skim hole 19 and into the tank, where silt is deposited. The static head of the water forces water with some hydrocarbons up the pipe 7, coalescent filter material 9 removes hydrocarbons, and cleaner water passes out outlet 18. In storm conditions the skim hole 19 chokes and excess water is directed over weirs 15, which may be screened to prevent ingress of debris, and passes directly out of outlet pipe 18 thus bypassing the filter material 9. A probe holster 20 is provided so that the amount of silt in the tank may be detected. The positioning of the filter unit in the upper section of the tank prevents blockage by silt and facilitates easy removal. The pipe 7 provides easy access to the lower part of the tank using a suction hose for the removal of silt and includes a nut and bolt 13 14 which may be used as a carry handle. |
