Wastewater treatment system and method
US5156741A · kind A · utility
Inventors
Key dates
| Filing date | Dec 28, 1990 |
| Grant date | Oct 20, 1992 |
| Priority date | — |
| Expiry date | Dec 28, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/37
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A biological treatment system and method is provided for treating wastewater from a treatment plant which provides primary and secondary treatment. An aggregate-filled bed enclosed by a water-impervious barrier is used to receive and cleanse the wastewater using the roots of turf grass grown on the top of the bed. Wastewater is introduced near the bottom of the bed and flows generally upwardly through the voids in the media, passing through the root system of the turf grass. Wastewater is withdrawn from the bed at a higher level than it is introduced. The top surface of the bed remains dry and is capable of supporting pedestrian and vehicular traffic. A recirculation system maintains the generally upward flow of water through the bed. Transpiration reduces the volume of the wastewater and the biological cleansing action of the roots cleanses the wastewater. Alternative forms of the bed are described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.