Process for purifying water using fine floc and microfiltration in a single tank reactor
US6027649A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1997 |
| Grant date | Feb 22, 2000 |
| Priority date | — |
| Expiry date | Oct 4, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/283
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A system of purifying water to remove at least one of natural organic matter, color, turbidity, bacteria, cysts and oocysts, viruses, arsenic compounds and insoluble impurities. The system comprises the steps of providing a body of water to be purified; controlling the pH of the body in a range of 5 to 8; and adding a coagulant to the body to provide a floc. The floc is maintained in the body in a concentration in the range of 1 to 6, for purposes of adsorbing at least one of the natural organic matter, color, turbidity and bacteria to provide treated water. Thereafter, a first portion of the treated water and floc is removed from the body of water. A submerged semi-permeable membrane is provided in the body of water for removing a second portion of the treated water. The membrane has a pore size in the range of 0.02 to 1 .mu.m to provide a permeate comprised of purified water and to provide a retentate containing the floc. The body of water is treated with a mixing means to minimize membrane fouling and to provide thorough mixing of the floc in the body of water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.