US 5,843,308 AGranted

Wastewater management system

AssigneeDSS Environmental, Inc.

InventorsJames F. Suozzo, Kathleen A.. Suozzo

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Abstract

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

Claims18

Dependent claims

A two-stage, continuously-filtered system for eliminating phosphorus, pathogens and protozoa from water, comprising:

a first sand-filter unit that is upflow loaded with water influent, said first sand-filter unit having an effluent weir and a reject weir, with a level of said reject weir being disposed below said effluent weir, whereby said first sand-filter unit evacuates all of its reject water, said first sand-filter unit comprising a sand bed containing relatively larger-grained sand;
a first feeding means for upflow feeding said first sand-filter unit with water influent containing contaminants;
a second sand-filter unit connected in series to said first sand-filter unit, said second sand-filter unit being smaller than said first sand-filter unit and having means for receiving its influent from the effluent weir of said first sand-filter unit, said second sand-filter unit having an effluent weir and a reject weir, said second sand-filter unit comprising a sand bed containing relatively finer-grained sand than said first sand-filter unit;
a second feeding means for upflow feeding said second sand-filter unit with influent from said effluent of said first sand-filter unit;
and
means for re-introducing reject water from the second sand filter unit into the influent that is fed to said first sand-filter unit.

3 more elements

Dependencies are inferred from the claim text.