Method for treating gas liquor
US4132636A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 1977 |
| Grant date | Jan 2, 1979 |
| Priority date | — |
| Expiry date | Nov 28, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/909
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for treating a gas liquor to remove polluting substances with a stable treating efficiency and at a high rate which comprises the steps of PA1 (A) pre-treating a gas liquor discharged from a quenching of coke oven gas, the gas liquor containing ammonia, phenols, thiocyanate compounds, cyanide compounds, suspended solids and oils, to reduce the ammonia content of the gas liquor to about 1,000 ppm or less; PA1 (B) subjecting the gas liquor from step (A) to a first biological treatment comprising treating the gas liquor treated in step (A) with microorganisms, PA1 (C) subjecting the gas liquor from step (B) to a second biological treatment comprising treating the gas liquor treated in step (B) in an aerating tank including a mixture of suspended solids comprising powdered activated carbon and activated sludge mixed with the gas liquor, and PA1 (D) adding an iron salt to the gas liquor from step (C) to cause coagulation and sedimentation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.