Biological contactor for purifying water to produce drinking water and associated control method
US5037550A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1989 |
| Grant date | Aug 6, 1991 |
| Priority date | — |
| Expiry date | Dec 4, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/10
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A biological contactor (8) comprises a granular bed including a layer (17) based on activated carbon the material of which satisfies the following conditions: PA1 density between 0.18 and 0.32 g/cm.sup.3, PA1 carbon tetrachloride adsorbing power between 60% and 120% by weight, PA1 carbon tetrachloride retention less than 25% by weight of the carbon tetrachloride adsorbed mass, PA1 methylene blue: between 5 and 30 ml, PA1 particle size: between 0.5 and 1.5 mm effective size with a coefficient of uniformity less than 2. A washing cycle (21, 24) (air only; air plus water; water only) of the contactor is triggered (38) when a parameter (36, 37) representative of the population of algae in said layer reaches a predetermined set point threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.