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Treatment of waste lye
Alkali wash is an important treating method for
gasoline, kerosene, diesel and other liquid
hydrocarbons. However, the waste lye is one of the main
pollutants in refineries.
FRIPP has
successfully developed the mild wet oxidation
(WAO)—stage intermittent activated sludge (SBR) combined
process (including three patents and exclusive
technologies for WAO reactor, recycling cooler,
automatic control, and etc.). This combined process is a
good approach to the treating of waste lye in
refineries.
With this technology, the 2-valent
sulfur can be transformed into sulphate and sulphite
under mild temperature and pressure, and the contents
and discharging of hydrogen sulfide and the total
non-methane hydrocarbons are much lower than the limits
stipulated in the Overall discharging standard for
air pollutants. At the same time, the compounds,
which is difficult to be removed via biodegradation, are
oxidized into low molecule organic acids/aldehyde, and
etc that can be easily biodegraded, which greatly
increased the biology of the waste lye. Besides, the COD
content and volatile phenols in waste lye are greatly
decreased, COD is lower than 500mg/L and the volatile
phenol is lower than 10 mg/L in the water
outflow.
This technology has been applied in Daqing
Petrochemical Works, Anqing Petrochemical Works, Dalian
Petrochemical Company and etc.
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