Method for treating water
AssigneesSaken Co., Ltd., Ryoko Co., Ltd.
InventorTeruo Higa
Life of this patent
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Abstract
A method and apparatus for treating contaminated water without addition of chemical agents. A treatment zone is provided, having water-impermeable bottom and side walls, the bottom sloping stepwise from an input and to an output end. Soil is disposed within the treatment zone, and plants are grown therein. Contaminated water is applied to the input end of the treatment zone and flows through the soil to the output end, thereby being treated by the soil and providing nutrients to the plants. Treated water is collected in a collection area at the bottom of the output end, from where it is removed for use.
Claims7
A method for treating contaminated water, comprising the steps of:
- providing a treatment zone having water-impermeable side and bottom walls, said treatment zone being located beneath the surface of the earth, said bottom walls descending downward in a series of steps, the bottom surface of each of said steps being substantially horizontal, from an input end to an output end, said treatment zone containing only soil or other constituents naturally occurring in said zone or artificially added thereto and having plants growing therein which vary from shallow-rooted plants positioned near the input end to deep-rooted plants positioned near the output end;
- applying the contaminated water to said soil at said input end;
- allowing the water to flow through said soil from said input end solely by force of gravity;
- collecting treated water at the bottom portion of said output end;
- and
- receiving said treated water.
Dependencies are inferred from the claim text.