Water retardant covering material for solid waste landfills
US5054406A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 1990 |
| Grant date | Oct 8, 1991 |
| Priority date | — |
| Expiry date | Jul 11, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention describes a water retardant material produced by a mixture of earthen clay and 15% to 25% by weight of recycled paper pulp sludge. Paper pulp sludge is incinerated in a rotary kiln, typically a rotary cement kiln asphalt dryer, or fluidized bed incinerator. Paper pulp sludge is fed continuously into said rotary kiln while temperature are maintained in the range of approximately 800.degree. to 3500.degree. F. During incineration, mixing catalysts (typically casein or soy protein) and wood pulp fibers are burned while moisture is evaporated. The resulting incinerated product consists essentially of carbonate particles which are collected for subsequent use. Use of this material as a water retardant covering for landfills is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.