| 摘要 |
A method and apparatus for filtering suspended solids from a liquid suspension such as sewage, wherein the liquid to be filtered is forced upwardly through a filter media. Upon leaving the filter media, the filtered liquid flows over a weir and into an effluent trough, from where it is directed to an outlet conduit for suitable disposition. The solids entrapped in the filter media during the filtering process are removed therefrom by a cleaning or washing process, which simply involves increasing the rate at which the liquid is passed through the filter media. During washing, the liquid, such as water, is forced through the filter at a rate of flow equal to several times the rate of flow the water moves during filtering, which acts to fluidize the entrapped solids removed from the filter media, enters the effluent trough located above the filter media and because the rate of flow is higher than that during the filtering process, is directed into a compartment spaced away from where the filtered water has been directed. The washwater may then be re-directed through the treatment plant, or to other suitable disposal. The washing operation of the filter can either be pre-set to take place at specified time intervals, or can be initiated upon the establishment of a predetermined back pressure in the filter inlet resulting from clogging of the filter by the solids removed from the water being filtered.
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