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Presented by Haleimah Mohamed199903922 Tamadher Ali Mohamed199902261 Reem Khalifa199902241 Fatima Al-Zarouni199903949 Under the supervision of Dr. Mohamed.

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Presentation on theme: "Presented by Haleimah Mohamed199903922 Tamadher Ali Mohamed199902261 Reem Khalifa199902241 Fatima Al-Zarouni199903949 Under the supervision of Dr. Mohamed."— Presentation transcript:

1 Presented by Haleimah Mohamed199903922 Tamadher Ali Mohamed199902261 Reem Khalifa199902241 Fatima Al-Zarouni199903949 Under the supervision of Dr. Mohamed Abdulkarim

2 HCl Al 2 (SO 4 ) 3.14.3H 2 O SBS Disinfection pH adjustment Anti-scalant addition Media Filter Coagulation unit Cartridge Filter Disinfection (Chlorination) De-Chlorination unit Neutralization pH adjustment Storage Tank R O M e m br an e NaOCl Hypersperse AS110 HPP NaOH NaOCl Pump

3 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

4 [K sp ] = 2.44 x10 -5 [K sp ] = 1.05 x10 -4 93.176 L/day [Ca +2 ] x [SO4 -2 ]= 4.23 x 10 -4 mol/L Ksp= 2.44 x 10-5 The equation of calulating the dose rate Antiscalant (Hypersperse AS110)

5 PlantSDI before cartridge SDI after cartridge Al Jubail, Saudi Arabia RO desalination plant 32.8 Singapore pilot plant6.56.1 desalination plant at Larnaca, Cyprus 32.8

6

7 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 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 * 10 6 mg /day In theory, 1.34 mg of SMBS will remove 1 mg of free chlorine.

9 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 H2OH2OSBS

10 Q6 Stage 1Stage 2 Q1 Q2 Q4 Q5Q3 RO membrane

11 ParametersValue Overall Recovery%30% Recovery for second stage85% Salt rejection %95% Total product40MGD Total dissolved solid for total product170 ppm Total dissolved solid for feed43153ppm

12 Q 2 =47 MGD Q6 Q1 Q2 Q4 Q5Q3 TDS 2 = 2156.79 ppm

13 Material balance on first stage: Q6 Q1 Q2 Q4 Q5Q3 TDS 5 =13415 ppm Material balance on second stage: The overall salt balance for the system TDS 6 = 61550.46 ppm

14 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

15 Capacity of each filter = 600L/min number of filter = 582 filter 349 x 10 3 L/min Feed flow rate = feed water flow rate / filter capacity = Number of filter element Filter cartridge/ vessel = 26 Number of vessel = 25 ( 23 in operate + 2 standby) ΔP = 4 psi per 1 m 3 /min The feed flowrate inter each vessel= 15 m 3 /min Total ΔP = 15 x 4 = 60 psi = 4 bar

16 number of module = module

17 number of configuration = 203 configuration

18 ionsC (mg/l)C (mol/L) Mg +2 829.350.03412 Ca +2 4880.0122 Na + 13160.220.572 HCO 3 _ 115.90.0019 SO 4 -2 34730.03617 Cl - 238110.6726

19 For feed

20 propertiesStage #1Stage#2 Permeate flow 47 MGD40 MGD Q per,vessel 2755 L/h # of vessels 26902290 # of element 1614013740

21 One vessels Feed Permeate

22 The calculations of pressure drop in RO membrane

23 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

24 1.Chemicals 2.Process Sand filter Advantage: Sand work as a filter Disadvantages: Need higher pressure Limits on flow rate Cost

25 1)Mix brine with seawater before discharge. 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 coming from adjacent power plant. 4) Evaporation ponds

26 PID Before HAZOP

27 HAZOP analysis on water feed entering multi media filter. (Line no. 2) Guide Word DeviationCausesConsequences & Action NOFLOW Pump failure Ruptured (broken) pipe Valve (V2) shut No product o Check valve o Check & Repair pump and pipe o Put flow indicator (FI 2) LESSFLOW Pipe leakage Pump failure Low production quality Less feed pressure Slow operation o Check & Repair pump and pipe MOREFLOW Damage pump The multi media will be shutdown. The ratio between feed water and coagulant is not the same Need to fix coagulant dosing The efficiency of media filter will decrease. The suspended solid will not be removed Lower the product quality Over flow Lower removal capacity o Check & Repair V2

28 PID After Hazop

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