Liquid purification method
US4092245A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1977 |
| Grant date | May 30, 1978 |
| Priority date | — |
| Expiry date | Apr 7, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A system for purifying bodies of water, such as swimming pools, includes a prefilter upstream of a catalytic filter, and a pump for periodically circulating water to be treated through the prefilter and then through the catalytic filter. The catalytic filter includes a series of horizontally disposed filter elements each having a stationary layer of a permeable water-purifying biocatalyst composition. The preferred biocatalyst is a microbicidal surface compound formed by wet processing finely divided silver oxide, zinc oxide and lampblack. Water circulated through the prefilter is filtered to remove suspended solids or algae which would clog or otherwise disturb the biocatalyst filter cake. Water circulated through the catalytic filter is purified by surface contact with the biocatalyst. Repeated pool water contact with the biocatalyst generates a residual microbicidal condition in the pool water. The biocatalyst layer, the water circulated to it, and the water circulated away from it are constantly maintained at a pH above 7 and at a temperature between about 70.degree. F to about 98.degree. F to prevent deactivating the biocatalyst and to constantly maintain the residual microbic…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.