WASTEWATER MANAGEMENT SYSTEM

摘要

The present invention is a dual-stage, gravity continuously-backwashed filtering system for filtering contaminants from water. This filtering syste m has a first sand-filter unit (10a) that is loaded with water influent. The filtering system has injection points for coagulation chemicals and disinfection chemicals. The first sand-filter unit (10a) is connected in series to a second sand-filter unit (10b) of similar design. The first sand- filter unit (10a) is made up of large-grained sand (23), the second sand- filter unit (10b) fine grained sand (28). The second sand-filter (10b) unit receives its influent from the effluent weir (24) of the first sand-filter unit (10a). The reject water from the second filter unit (10b) is re- introduced into the influent that is fed to the first unit (10a). The reject matter from the first filter unit is passed to waste.