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Water
saving and reuse of purified water
China
is very much short of fresh water with per capita fresh
water volume being only one fourth of the world average.
Most of the enterprises under SINOPEC are located in North
China, East China, coastal areas of Middle China where
water resources are poor, or areas along the Yangzi River
where water is heavily polluted. Maximally saving water
and reasonably using water resources are vital to the
existence and development of a majority of enterprises of
SINOPEC.
On the whole, the key to increasing comprehensive
wastewater treating capacity and technology lies in
decreasing fresh water consumption and wastewater
discharging, and decreasing pollutants in discharging
water.
For wastewater treatment, there can be different
solutions, such as,
(1)
Oily wastewater: oil separation －
floatation －
secondary biotreatment－
qualified discharging
(2)
Sulfur and ammonia containing wastewater: stripping －reuse
as washing water for operation
(3)
Waste lye: WAO －
SBR －
secondary biotreatment－
qualified discharging
(4)
Wastewater from recycling water field: oil separation－
desalting －
sterilization －
reuse as water supply for recycling water field
(5)
Condensation water form operation: Oil separation －
Removing suspended solids －
Removing ferrum－
reuse as water supply for medium pressure boiler
(6)
Acid and alkali wastewater: neutralization －qualified
discharging
(7)
Wastewater from boiler: Desalting －
Reuse as water supply for boiler
Taking
the above measures, SINOPEC could gain around RMB 654
million judged by the domestic advanced level, and RMB 835
million by international advanced level (Table 1). And the
saving of water resources and unqualified waste
discharging fees is not included.
Table
1 Financial estimation from water consumption/discharging
saving
|
No.
|
Item
|
Unit
|
Value
|
Remarks
|
|
1
|
Oil
processing capacity
|
100
mt/a
|
1.2
|
－
|
|
2
|
Average
water consumption
|
t/t
crude
|
2.4
|
－
|
|
3
|
Advanced
level of water consumption
|
t/t
crude
|
1.1(0.5)
|
The
number in the parentheses in the foreign advanced
level, the same below
|
|
4
|
Water
saving when reaching the advanced level of water
consumption
|
t/t
crude
|
1.3(1.9)
|
－
|
|
5
|
Water
cost saving when reaching the advanced level of
water consumption
|
RMB/t
crude
|
2.14(3.14)
|
Water
cost at RMB 1.65 /t fresh water
|
|
6
|
Average
water discharging
|
t/t
crude
|
1.8
|
－
|
|
7
|
Advanced
level of water discharging
|
t/t
crude
|
0.5(0.3)
|
－
|
|
8
|
Water
discharging decrease when reaching the advanced
level
|
t/t
crude
|
1.3(1.5)
|
－
|
|
9
|
Treatment
cost saving when reaching the advanced level
|
RMB/t
crude
|
3.25(3.75)
|
Treatment
cost at RMB 2.5 /wastewater
|
|
10
|
Saving
of waste discharging cost when reaching the
advanced level
|
RMB/t
crude
|
0.06(0.07)
|
Waste
discharging cost at RMB 0.05 /t wastewater
|
|
11
|
Total
cost saving
|
RMB/t
crude
RMB
100M /a
|
5.45(6.96)
6.54(8.35)
|
the
saving of water resources and unqualified waste
discharging fees is not included
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FRIPP
has developed the medium/deep treatment technology for
refinery qualified wastewater to decrease the COD、ammonia
nitrogen, suspended solids and etc in wastewater so that
the wastewater can qualify as water supply for recycling
water field.
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