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Optimizing
and revamping technology for SDP
Pre-treating
for water inflow
Most
current SDPs in refineries use oil
removal！floatation！biotreatment process. This process
has high requirements for the quality of water inflow
according to SH 3080-1999 Standards for water feeding
and water discharging in petrochemical industry.
Without pre-treatment, the water inflow for disposal plant
cannot meet the standard.
For most refineries, the reason that their SDP
cannot perform full function lies in the fact that the
high waste content water, such as waste lye, sulfur and
nitrogen containing wastewater, wastewater from SDP sludge
unit, high concentration wastewater from oil tank is not
pre-treated.
With FRIPP¨s technology, the above wastewater can
be pre-treated so that they meet SH 3080-1999 water
standard before secondary bio-processing.
Revamping
of surface aeration pool
The
surface aeration pool of refinery SDP has man defects in
not only water inflow and aeration modes, but also
sediment and water discharging, resulting in low cleaning
efficiency and large sludge loss. Besides, it cannot
remove nitrogen-containing wastes.
In order to increase the capacity of SDP and realize
qualified discharging, FRIPP developed the revamping
technology for surface aeration pool by transforming the
operation mode of surface aeration pool from co-building
to SBR so that the COD, ammonia nitrogen, petroleum
components, sulfides and volatile phenols in discharging
water meet the GB 8978-96 (Standard for comprehensive
wastewater discharging) and realizing real wastewater
cleaning and qualified discharging.
Automatic
monitoring/controlling system
Limited
by sampling and analyzing conditions, it¨s impossible to
completely prevent high concentration wastewater from
affecting SDP. A solution besides strengthening
pre-treatment for wastewater and regular management of the
plant is to install an automatic monitoring system for
water quality and quantity at the water inflow point of
SDP so that the quality and quantity of wastewater can be
real-time monitored. The parameters for water quality are
pH, COD, petroleum components, suspended solids,
temperature, and etc. The accuracy of the controlling
equipment can be a little lower because it is only for
process control. With this system, it is possible to
automatically transfer wastewater that is not qualified in
quality or quantity to adjustment pool. When the quality
and quantity of wastewater is back to normal, the system
is automatically changed back to normal operation and
wastewater in the adjustment pool is mixed with untreated
wastewater and resent back to SDP. Through the above
practice, we can make sure that the SDP is under normal
operation with process and control methods.
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