Potable water treatment plant and method of maintaining same
First Claim
1. A package plant for treating raw water to produce potable water, said package plant comprising:
- an inlet for receiving water to be treated;
an ozonator for disinfecting said water;
a contact column to permit ozone from said ozonator to mix with said water, said contact column having a vent to remove free ozone from said water before said water is directed to an upflow roughing filter, said up-flow roughing filter including at least one lower coarse filter media for removing coarse solids from said water, and at least one upper less coarse chemically active filter media for removing less coarse solids from said water and any disinfection residuals and byproducts from said ozonator, said water flowing through said lower filter first and then through said upper filter; and
a down-flow slow sand filter, said slow sand filter being sized and shaped to promote a biomass growth for further purifying said water, wherein said chemically active filter media protects said biomass from residual disinfectants and contributes to the removal of the byproducts of disinfection.
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Accused Products
Abstract
A package plant for treating raw water to yield potable water. The package plant includes an inlet for raw water, followed by an ozonator for disinfecting the water. Next is provided an up flow roughing filter including a chemically active layer, on top. A slow sand filter follows, which is sized and shaped to promote growth of a biomass for water purification. The up flow roughing filter removes particulates, contributes to the removal of dissolved organics, and protects the slow sand biomass by removing disinfection residuals. In another aspect a method of maintaining the plant is provided, including washing the up flow roughing filter by draining water down through it, providing a vigorous up flow to agitate the top layer, and then washing the slow sand filter.
29 Citations
12 Claims
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1. A package plant for treating raw water to produce potable water, said package plant comprising:
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an inlet for receiving water to be treated;
an ozonator for disinfecting said water;
a contact column to permit ozone from said ozonator to mix with said water, said contact column having a vent to remove free ozone from said water before said water is directed to an upflow roughing filter, said up-flow roughing filter including at least one lower coarse filter media for removing coarse solids from said water, and at least one upper less coarse chemically active filter media for removing less coarse solids from said water and any disinfection residuals and byproducts from said ozonator, said water flowing through said lower filter first and then through said upper filter; and
a down-flow slow sand filter, said slow sand filter being sized and shaped to promote a biomass growth for further purifying said water, wherein said chemically active filter media protects said biomass from residual disinfectants and contributes to the removal of the byproducts of disinfection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification