Water purification process
US4255266A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 1979 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | May 30, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/10
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
In a biological water purification process polluted water, including surface water to be made potable, sewage water or industrial water, is percolated through a submerged fixed bed of granular material such as activated carbon, chamottes, raw clays, etc., with an oxygenated gas being upwardly injected at an intermediate level of the bed. The water and gas delivery rates are controlled to satisfy the following relations: ##EQU1## wherein Q.sub.1 is the delivery of oxygenated gas in m.sup.3 /hr, PA1 Q.sub.2 is the delivery of water to be treated in m.sup.3 /hr, PA1 .epsilon. is the porosity of the granular material bed, PA1 .alpha. is the maximum fraction of the volume that can be occupied by the gas without affecting the effectiveness of the treatment, PA1 S is the bed section in m.sup.2, PA1 h is the height of the bed in meters, PA1 v is the vertical component of the average speed of the ascending gas bubbles in m/hr, PA1 K.sub.1 is a constant corresponding to the fraction of volume of bed occupied by immobilized gas pockets in m.sup.3, PA1 K.sub.2 is the concentration of gas in oxygen in kg/m.sup.3, PA1 K.sub.3 is the value of the demand for oxygen that 1 m.sup.3 of granular mater…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.