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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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