Waste water purification processes
US4160725A · kind A · utility
22Cited by
6References
6Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Mar 23, 1978 |
| Grant date | Jul 10, 1979 |
| Priority date | — |
| Expiry date | Mar 23, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/586
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Waste water from coke ovens is purified by passing the waste water and a stripping fluid through a stripping column in counterflow. Non-volatile ammonium compounds are removed in one region of the column, phenolic compounds are removed in another region, and volatile ammonium compounds are removed in yet another region. The region in which phenolic compounds are removed is disposed at such a location that no ammoniacal vapor can traverse it. An acid and a strong base are fed laterally into the column at two different levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.