sea water presentation
TRANSCRIPT
-
8/13/2019 SEA WATER Presentation
1/30
-
8/13/2019 SEA WATER Presentation
2/30
HCl Al2(SO4)3.14.3H2O
SBS
Disinfection pH
adjustment
Anti-scalant
addition
Media Filter
Coagulation
unit
Cartridge
Filter
Disinfection
(Chlorination)
De-Chlorination
unit
Neutralization
pH adjustment
Storage
Tank
ROMembr
an
e
NaOCl
Hypersperse AS110
HPP
NaOHNaOCl
Pump
-
8/13/2019 SEA WATER Presentation
3/30
Used to prevent reverse osmosis membrane from fouling by
removing large percentage of suspended solid from feed water
SDI measurement commonly used to indicate the effectiveness
of media filter
Almost, all RO membrane manufacture recommends SDI to be
less than 3
-
8/13/2019 SEA WATER Presentation
4/30
[Ksp] =
2.44 x10-5[Ksp] =
1.05 x10-4
93.176 L/day
[Ca+2] x [SO4-2]= 4.23 x 10-4mol/L
Ksp= 2.44 x 10-5
The equation of calulating the dose rate
Antiscalant (Hypersperse AS110)
-
8/13/2019 SEA WATER Presentation
5/30
Plant SDI before
cartridge
SDI after
cartridge
Al Jubail, Saudi Arabia RO
desalination plant
3 2.8
Singapore pilot plant 6.5 6.1
desalination plant at Larnaca,
Cyprus
3 2.8
in
outin
SDI
SDISDIremoval
%
%6removal
-
8/13/2019 SEA WATER Presentation
6/30
%6removal
-
8/13/2019 SEA WATER Presentation
7/30
Normally, the available free chlorine concentration before RO
membrane is 0.5 1 ppm.
The maximum allowable chlorine concentration before RO
membrane is 0.05 ppm.
Residual free chlorine can be removed by:
adsorption onto activated carbon media filter
chemical reducing agent (SBS)
-
8/13/2019 SEA WATER Presentation
8/30
Sodium Bisulfite can be formed by dissolving Sodium
Metabisulfite (SMBS) in water
In practice, designers used to add 3 mg/L of SMBS of chlorine
Total amount of free chlorine in water = 503 * 106mg /day
32522 2NaHSOOHOSNa
In theory, 1.34 mg of SMBS will remove 1 mg of free chlorine.
-
8/13/2019 SEA WATER Presentation
9/30
The amount of SMBS needed to remove free chlorine =
7968.22 mole/day
The dosage rate of SBS needed to remove residual chlorine =
205.58 gal/day
The amount of moles of Sodium Bisulfite needed to remove the
free chlorine = 15,936.13 mole/day
SMBS
H2O SBS
-
8/13/2019 SEA WATER Presentation
10/30
Q6
Stage 1 Stage 2Q1 Q2 Q4
Q5Q3
RO membrane
-
8/13/2019 SEA WATER Presentation
11/30
Parameters Value
Overall Recovery% 30%
Recovery for second stage 85%
Salt rejection % 95%
Total product 40MGD
Total dissolved solid for total product 170 ppm
Total dissolved solid for feed 43153ppm
-
8/13/2019 SEA WATER Presentation
12/30
100%covRe rateflowfeed
rateflowPermeateery
Q2=47 MGD
Q6
Q1 Q2 Q4
Q5Q3
ionconcentratsaltfeed
ionconcentratsaltpermeaterejectionsalt 1
TDS2= 2156.79 ppm
-
8/13/2019 SEA WATER Presentation
13/30
Material balance on firs t stage:
ppmTDS
QTDSQTDSQTDS
654883
321
Q6
Q1 Q2Q4
Q5Q3
554422 TDSQTDSQTDSQ
TDS5=13415 ppm
Mater ia l balance o n s econd stage:
664411
TDSQTDSQTDSQ
The overal l salt balance for the sys tem
TDS6= 61550.46 ppm
-
8/13/2019 SEA WATER Presentation
14/30
Added for pH adjustment to minimize the corrosion in the
product water pipes
The calculation was based on
The required pH for drinking and potable water is in the range
of 6.5 9.5
Neutralization of acid
Adjust pH from 7 to 8
-
8/13/2019 SEA WATER Presentation
15/30
Capacity of each filter = 600L/min
number of filter = 582 filter
349 x 103L/minFeed flow rate =
feed water flow rate / filter capacity
= Number of filter element
Filter cartridge/ vessel = 26Number of vessel = 25
( 23 in operate + 2 standby)
P = 4 psi per 1 m3/min
The feed flowrate inter each vessel= 15 m3/min
TotalP = 15 x 4 = 60 psi = 4 bar
-
8/13/2019 SEA WATER Presentation
16/30
number of module =
min19modGallon
Q ule
min92361
GallonQfeed
4861
mod
ule
feed
Q
Qmodule
-
8/13/2019 SEA WATER Presentation
17/30
number of configuration = 203 configuration
-
8/13/2019 SEA WATER Presentation
18/30
ions C (mg/l) C (mol/L)
Mg+2 829.35 0.03412
Ca+2
488 0.0122
Na+ 13160.22 0.572
HCO3_
115.9 0.0019
SO4-2
3473 0.03617
Cl- 23811 0.6726
-
8/13/2019 SEA WATER Presentation
19/30
32899.1 im
iosm mTP 27319.1
psiPosm 28.471
For feed
elementAreaelementmembranefluxQ vesselper #,
vesselsper
stageper
QQvesselsofNumber
,
1,
6 vesselsofNumberelementofNumber
-
8/13/2019 SEA WATER Presentation
20/30
properties Stage #1 Stage#2Permeate flow 47 MGD 40 MGD
Qper,vessel 2755 L/h 2755 L/h
# of vessels 2690 2290
# of element 16140 13740
-
8/13/2019 SEA WATER Presentation
21/30
One vesselsFeed
Permeate
-
8/13/2019 SEA WATER Presentation
22/30
7.1
01.0 fcfc qnq
2
f loweconcentratf lowfeedqfc
The calculations of pressure drop in RO membrane
vesselsoneperpsiqfc 7.1738.28601.0 7.1
-
8/13/2019 SEA WATER Presentation
23/30
1. Chemicals
Sodium Hypochlorite
Antiscalent
Hydrochloric acid (HCL)
Sodium bio-sulphate Coagulant (Aluminum sulphate)
NaOH
2. Process
MMF
Membrane
Desalination plant Intake
3. Products Brine
-
8/13/2019 SEA WATER Presentation
24/30
1. Chemicals
2. Process
Sand filter
Advantage:
Sand work as a filter
Disadvantages:
Need higher pressure Limits on flow rate
Cost
-
8/13/2019 SEA WATER Presentation
25/30
1) Mix brine with seawater beforedischarge.
3. Products
2) More than one discharge.
These are located a way of each other at a distance.
RO
plant
Feed seawater
To
seawater
5) Deep well disposal
3) Mixing brine water with cooling water comingfrom adjacent power plant.
4) Evaporation ponds
-
8/13/2019 SEA WATER Presentation
26/30
PID Before HAZOP
-
8/13/2019 SEA WATER Presentation
27/30
HAZOP analysis on water feed entering multi media filter. (Line no. 2)
Guide
Word
Deviation Causes Consequences & Action
NO FLOW Pump failure
Ruptured (broken) pipe
Valve (V2) shut
No product
oCheck valve
oCheck & Repair pump and pipe
oPut flow indicator (FI 2)
LESS FLOW Pipe leakagePump failure
Low production qualityLess feed pressure
Slow operation
oCheck & Repair pump and pipe
MORE FLOW Damage pump The multi media will be shutdown.
The ratio between feed water and
coagulant is not the same
Need to fix coagulant dosingThe efficiency of media filter will
decrease.
The suspended solid will not be
removed
Lower the product quality
Over flow
Lower removal capacity
oCheck & Repair V2
-
8/13/2019 SEA WATER Presentation
28/30
PID After Hazop
-
8/13/2019 SEA WATER Presentation
29/30
-
8/13/2019 SEA WATER Presentation
30/30