Disposal of liquid waste and recovery of metals therefrom
US4255067A · kind A · utility
15Cited by
20References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 2, 1978 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | Nov 2, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C41/00
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Industrial liquid wastes containing low concentrations of heavy metals are applied to a soil bed where evaporation of the liquid occurs. The soil bed is lined with a liquid-impermeable liner of polymeric sheet material, bentonite clay or a laminate of the two to prevent escape of the liquid waste to the surrounding environment. After repeated applications of wastes to the bed, the concentration of metals in the bed reaches a level where the metals may be recovered by standard mining operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.