Rosa introduction for water treatment plant

January 20110 2
Index
1. Input data for analysis
2. Plant Design using ROSA 7.2
 Project Information
 Feedwater Data
 Scaling Information
 System Configuration
 Report
 Cost Analysis
3. Example

January 20110 3
Index
 Feedwater Data
 Report
 Cost Analysis
3. Example

January 20110 4
Input data for analysis
1. Feed water data:
 Feed water type: Seawater, bore hole, surface supply, tertiary effluent, RO
permeate.
 RO pre-treatment: Conventional pretreatment, MF or UF pretreatment
 Water composition: Answer Center: 2307
2. Permeate / Feed flow / Recovery
3. Operating temperature range (maximum and
minimum temperature)
4. Permeate quality requirements, e.g. TDS < 70 ppm,
SiO2 < 0.05 ppm
5. Focus on CAPEX or OPEX

January 20110 5
5. Focus on CAPEX or OPEX
Focus on minimizing capital costs (CAPEX):
Implications:
 Maximize system flux
 Minimize number of elements and vessels
Focus on minimizing operational costs (OPEX):
Implications:
 Lower system flux
 Higher number of elements and vessels
 Prefer low energy membranes
Focus on capital or operation costs

January 20110 6
Index
 Feedwater Data
 Report
 Cost Analysis
3. Example

January 20110 7
 Feedwater Data
 Report
 Cost Analysis
Plant Design using ROSA

January 20110 8
 Feedwater Data
 Report
 Cost Analysis

January 20110 9
ROSA – Control Panel: File

January 20110 10
ROSA – Control Panel: Options
Batch Processor:
allows the software to run
multiple projections
automatically

January 20110 11
Batch Processor
INPUT VARIABLES
 Flow Factor: Start-up and Long term
 Temperature: Maximum & Minimum and desired number of
intermediate points
 Possibility to activate the “High Temperature Effect”
OUTCOME
 ROSA will generate projections for each temperature at
each Flow Factor indicated
 Projections can be stored in the same folder as the ROSA
file
 A summary excel file can be generated as well. The
parameters to be included in this summary should be
indicated and chosen by the user

January 20110 12
Batch Processor
2. Input parameters: Indicate
temperature range, FF and “high
temperature effect”
3. Output parameters: Select from
the list those parameters to be
included in the summary table
1. Go to options>Batch processor once feedwater & design
are defined

January 20110 13
INPUT
10ºC 15ºC 20ºC 25ºC 30ºC
FF 1     
FF 0.8     
Batch Processor - Example
Temperature Flow Factor (FF)
Intermediate
points, nº
Minimum Maximum Start up Long term
3
10ºC 30ºC 0.80 0.75 – 0.65
Note: in case of a two passes system, FF for both passes should be indicated.
OUTPUT
The following projections will be automatically generated

January 20110 14
Batch Processor – Outcome I
Once all the simulations are finished, the user is asked to
save the results as a summary excel file

January 20110 15
Batch Processor – Outcome II
As a result, the user will get all the projections and the
summary excel file
Note: to ensure projections are saved in the same folder as the original
ROSA file -> go to options -> files and folders and select:
save the output file in the same folder as the input file
ROSA file
Generated
projections
Summary file

January 20110 16
Database can be updated using Database switching
tool

January 20110 17
When first opened it shows where the ROSA files are
stored by default
Can be changed according to the personal
preferences

January 20110 18
User Data Settings – stores introduced and selected
information

January 20110 19
ROSA – Control Panel: Help

January 20110 20
ROSA – Project description
Project basic
information

January 20110 21
ROSA – Limiting Scenarios
We should consider the two limiting
scenarios:
A) Highest T + Highest FF (short term
conditions) + Highest feed TDS
Worst scenario in terms of salt passage
and hydraulics of the system
(highest flow rate in first elements)
B) Lowest T + Lowest FF (long term conditions)
+ Highest feed TDS
Worst scenario in terms of energy
demand (useful for sizing the high
pressure pump)

January 20110 22
Flow Factor Concept:
 FF = 1.0 Nominal element flow performance according
to specification
 FF = 0.80 80% of nominal element flow performance
Long term FF (+ 3 years) depends strongly on:
 Temperature, raw water source, pre-treatment, feed pressure, etc.
Flow Factor
Membrane
Start up
(expected)
+ 3 years
(fouling excluded,
clean membrane)
+ 3 years (expected,
fouling included)
BW 1.0 0.80 0.75 – 0.65
SW 1.0 0.80 0.70 – 0.65
ROSA – Flow Factors

January 20110 23
Pre-stage Pressure Drop
(ΔP) can be defined
If the specific ΔP is not
known, leave the default
value
ROSA – User Defined
Pre-stage Pressure Drop

January 20110 24
 Feedwater Data
 Report
 Cost Analysis

January 20110 25
Choose Feed water type
Introduce the T and pH
Cations and Anions
should be balanced
Introduce the water analysis data
1. Check the box: Specify individual solutes
2. Introduce the concentrations
ROSA – Introducing Feed water analysis

January 20110 26
Choosing Feed Water Type
• For more information refer to Answer Center answer 209
Feed water type Description
RO Permeate SDI<1 Very-low-salinity, high-purity waters (HPW) coming from
the first RO systems (double-pass RO system) or the
polishing stage in ultrapure water (UPW) systems with TDS
up to 50 mg/L.
Well Water SDI<3 Water from a ground source that has been accessed via well.
Usually, has low fouling potential.
Surface Supply SDI<3 Water from rivers, river estuaries and lakes. In most cases it
has high TSS, NOM, BOD and colloids. Frequently, surface
water quality varies seasonally.Surface Supply SDI<5
Tertiary Effluent
(Microfiltration) SDI<3
Industrial and municipal wastewaters have a wide variety of
organic and inorganic constituents. Some types of organic
components may adversely affect RO/NF membranes,
inducing severe flow loss and/or membrane degradation
(organic fouling).
Tertiary Effluent
(Conventional) SDI<5
Seawater (Well/MF) SDI<3 Well -water from a beach well with any type of pre-treatment
MF –Seawater any type with Microfiltration/Ultrafiltration as a
pre-treatment
Seawater (Open Intake) SDI<5 Open intake seawater with conventional pre-treatment

January 20110 27
Choosing Feed Water Type
• For more information refer to Answer
Center answer 209
SDI specification Description
SDI<1 RO permeate
SDI<3
Before RO very good pre-treatment is used:
Microfiltration, Ultrafiltration
SDI<5 Conventional pre-treatment is used before RO.
SDI Calculation
100
1
% 30











T
t
t
T
P
SDI
f
i
T
Where:
%P30 – percent @ 30 psi feed pressure
T – total elapsed flow time
ti – initial time required to collect 500 ml sample
tf – time required to collect 500 ml sample after
test time T

January 20110 28
ROSA – Saving the Water Profile
Previous water profiles can be loaded
Current water profile can be
added to the library

January 20110 29
ROSA – Temperature History Effect
Only for SWRO cases

January 20110 30
Temperature History Effect -SWRO designs
 RO operation at elevated temperatures (35ºC and
above) causes an irreversible flow loss that becomes
apparent if the system is later operated at lower
temperatures (20-35ºC).
 This is a phenomenon common to all thin film
composite RO membranes operated under similar
conditions.

January 20110 31
Temperature History Effect -SWRO designs
 The reduction of permeate flow is usually a combination of both
elevated pressure and temperature and the effect is strongest when
elevated temperature and pressure occur simultaneously.
 While a number of factors impact this permeate flow loss, the major
factors are believed to be:
• Compaction of the microporous polysulfone layer which decreases
membrane permeability. Long recognized but not well
quantified.
• Intrusion of the membrane composite into the permeate carrier,
leading to increased permeate-side pressure drop. This is a
function of temperature and pressure, as well as spacer geometry
and strength of the composite membrane.
 Due to the relatively low pressure in brackish water applications, the
performance impact of elevated temperature is much lower
compared to seawater conditions.

January 20110 32
 Feedwater Data
 Report
 Cost Analysis

January 20110 33
ROSA – Scaling information

January 20110 34
 Feedwater Data
 Report
 Cost Analysis

January 20110 35
ROSA - Introduction of known data
The Flow Calculator
 New way to enter project input
 Flows and recoveries of both passes can be
defined at the same time
 The quantity of permeate blending or permeate
split can be determined at the same time

January 20110 36
ROSA - Introduction of known data
To introduce the Flow and Recovery data:
1. Double click on any of the boxes:
Permeate Flow, Recovery, Feed Flow or
Permeate Flux
2. Pop-up window (Flow Calculator) will
appear
3. Specify two parameters to be
introduced by checking the Specify box
4. Introduce the data
5. Click on Recalculate
6. Click on Accept Changes and Close

January 20110 37
Main components of a membrane system
Pump
Concentrate line
Feed
Water
Main components:
pump(s), pipes, pressure vessel(s), membrane element(s)
Permeate line
One or more pressure vessel(s) containing
one or more membrane elements

January 20110 38
Serial arrangement of membrane elements in a pressure vessel
RO FILMTEC™
element
Main components of a membrane system

January 20110 39
ROSA – Membrane Element Selection

January 20110 40
According to:
i. System capacity
ii. Feed water TDS
iii. Feed water fouling potential
iv. Required product water quality and
Energy requirements
Select the membrane element type
Membrane Element Selection

January 20110 41
i. According to System capacity
 Element diameter for system capacity of about
2.5” < 200 l/h
4.0” < 2.3 m3/h
8.0” > 2.3 m3/h
 Element length
Standard: 40” (1016 mm)
For small compact systems: 21” or 14”

January 20110 42
ii. According to Feed water TDS (Rules of thumb)
< 1000 mg/l NF270, NF90, XLE, LE, LP, TW30, BW30
< 10 000 mg/l BW30
10 000 - 30 000 mg/l SW30XLE, SW30ULE
30 000 - 50 000 mg/l SW30HR, SW30XHR, SW30HRLE, SW30XLE

January 20110 43
iii. According to Feed water fouling potential
 Standard feed spacer thickness: 28 mil
 Feed spacer thickness for feeds with increased
fouling potential: 34 mil used in BW30-400/34i,
BW30-365, BW30-365-FR, XFRLE-400/34i,
BW30XFR-400/34i, SW30HRLE-370/34i
 Fouling resistant BW membrane for biofouling
prevention - used in XFRLE-400/34i, BW30XFR-
400/34i, BW30-365-FR

January 20110 44
iv. According to Required product water quality and
Energy requirements
Higher salt
passage
Lower Salt
passage
Lower feed
pressure
Higher feed
pressure
NF270
NF90
XLE
LE
BW30 / TW30
BW30XFR
BW30HR
SW30ULE
SW30XLE
SW30HR / SW30HR LE
SW30XHR

January 20110 45
ROSA – Configuration design

January 20110 46
Pump
Concentrate line
Feed
Water Permeate line
Configuration - Single vessel system
100 m3/day
50 m3/day
50 m3/day
One pressure vessel containing one or
more membrane elements
50%
FlowFeed
FlowPermeate
Recovery 
 For low flow rate
 For low system recovery

January 20110 47
Pressure vessels in parallel with common feed,
concentrate and permeate connections
 For higher permeate flow rates
 For modest system recovery
 Typical in seawater desalination Permeate
Pump
Concentrate
100 m3/day
50 m3/day
50%
FlowFeed
FlowPermeate
Recovery 
Configuration - Single stage system

January 20110 48
 Use for higher recovery
 Typical 75% recovery with 6-element vessels
Pump
Concentrate
Permeate
Concentrate
Two stage system
Configuration - Multistage

January 20110 49
Pump
Permeate
Concentrate
Use for higher recovery
Typical 85% recovery with 6-elements vessels
Up to 90% depending on the feed water quality
Permeate: 50 m3/day per PV
Feed:
400 m3/day
%85


400
50100200
FlowFeed
FlowPermeate
Recovery
Three Stage System
Permeate: 50 m3/day per PV
Permeate: 50 m3/day
Configuration - Multistage

January 20110 50
Number of serial element positions should be higher for
 Higher system recovery
 Higher fouling tendency of the feed water
Number of stages depends on
 Number of serial element positions
 Number of elements per pressure vessel
Configuration – Number of stages selection

January 20110 51
Configuration – Number of stages selection
N u m b er o f stag es o f a b rackish w ater system
S ystem
R eco very (% )
N u m b er o f serial
elem en t p o sitio n s
N u m b er o f stag es
(6-elem en t vessels)
40 – 60 6 1
70 – 80 12 2
85 – 90 18 3
Number of stages of a sea water system
System
Recovery (%)
Number of serial
element positions
Number of stages
(6-element
vessels)
Number of stages
(7-element
vessels)
Number of stages
(8-element
vessels)
35 - 40 6 1 1 -
45 7 - 12 2 1 1
50 8 - 12 2 2 1
55 – 60 12 - 14 2 2 -

January 20110 52
Multistage systems: Staging ratio calculation
1)(iN
(i)N
R
V
V


R Staging ratio
NV(i) Number of vessels in stage i
NV(i +1) Number of vessels in stage (i +1)
Y System recovery (fraction)
n Number stages
n
1
Y)-(1
1
R 






Calculate number of vessels of first stage NV(1)
R1
N
(1)N 1-
V
V


RR1
N
(1)N 2-1-
V
V


For 2 stage system
For 3 stage system

January 20110 53
The active stage/Pass is highlighted
Click on the system configuration to
move from one stage to another
Typical staging ratio:
1.5 sea water systems
with 6-element vessels
2 brackish water systems
with 6-element vessels
3 2nd pass RO systems
Multistage systems: Staging ratio calculation

January 20110 54
 Way to increase recovery by recirculating reject to increase
feed flow
 Typical for special / waste water applications
 Typical for single vessel systems
Pump
Recycle
Permeate
Concentrate
Configuration – Concentrate recycle

January 20110 55
 Permeate from first array goes into another array
 Use when standard permeate quality is not sufficient
 For high purity applications
 Sometimes part of first pass permeate is blended with the second pass
permeate stream: second pass size can be reduced.
Pump
Feed
Water
Concentrate
(drain)
Concentrate
(sidestream)
Final Permeate
Pass 1 Pass 2
Configuration – Double pass
(First pass permeate blending)

January 20110 56
To the second pass goes only the permeate produced by the
first pass rear elements.
Double pass with permeate split-stream
Feed Concentrate
Rear
Permeate
Front
Permeate
Concentrate (drain)
Final Permeate
Feed
Pump
Pass 2
Rear
Permeate
Front Permeate
Pass 1

January 20110 57
 Rule 1: The permeate quality produced by the front elements of the
pressure vessel is always better than the quality of the permeate
produced by the rear elements.
Why?
39181 44164 49422 54700 59700 64178 68000
Salinity gradient in the feed water channel (ppm)

January 20110 58
 Rule 2: Elements in front position in the pressure vessel produce
more permeate than the rear position elements.
Why?
39181 44164 49422 54700 59700 64178 68000
Pressure gradient in the feed channel (bar)
61.6 61.3 61 60.8 60.6 60.4 60.3
Salinity gradient in the feed water channel (ppm)
Higher Salinity Higher Osmotic Pressure Lower Production
Lower Feed Pressure Lower Production

January 20110 59
25.12
21.02
17.03
13.37
10.21
7.63
5.62
0
5
10
15
20
25
30
1 2 3 4 5 6 7
Posición elemento dentro caja de presión
Caudalpermeadoproducido
(m3/día)
83.76
110.16
147.74
201.69
279.03
389.47
544.81
0
100
200
300
400
500
600
1 2 3 4 5 6 7
Posición elemento dentro caja de presión
TDSpermeado(ppm)
permeateflow
produced(m3/day)
PermeateTDS(ppm)
Element position within the pressure vessel Element position within the pressure vessel
Feed Concentrate
Rear
Permeate
Front
Permeate
Concentrate (drain)
Final Permeate
Feed
Pump
Pass 2
Rear
Permeate
Front Permeate
Pass 1

January 20110 60
Permeate Split

January 20110 61
Permeate Split

January 20110 62
Nº of Elements per Pressure Vessel Selection

January 20110 63
Number of elements per vessel
Large 8-inch systems
 Benefits of vessels for 7 to 8 elements:
• lower capital costs
• higher recovery possible with same number of stages
 Benefits of vessels for 6 and less elements:
• less pressure drop
• better cleaning results
• more compact
• more stages for better hydraulic design
Nº of Elements per Pressure Vessel Selection

January 20110 64
Nº of elements selection: Average system flux
Select the design flux (f) based on
• pilot data
• customer experience
• typical design fluxes according to the
feed source found in System Design
Guidelines
• CAPEX or OPEX focus
NE: number of elements
QP: design permeate flow rate of system
f: flux
SE: active membrane area of the selected
element
E
P
E
Sf
Q
N



January 20110 65
Multistage systems: Balance the permeate flow
rate
 Permeate flow rate per element decreases from the feed end
to the concentrate end of the system because of
• Pressure drop in the feed/concentrate channels
• Increasing osmotic pressure of the feed/concentrate
 Imbalance of permeate flow rate predominant with
• High system recovery
• High feed salinity
• Low pressure membranes
• High water temperature
• New membranes

January 20110 66
 Why balance the permeate flow rate?
• Avoid excessive flux of lead elements
• Reduce fouling rate of first stage
• Make better use of tail end membranes
• Reduce number of elements
• Improve product water quality
 Methods to balance the permeate flow rate
• Boosting the feed pressure between stages
• Permeate backpressure to first stage only
• Membranes with lower water permeability in lead positions -
membranes with higher water permeability in tail positions
Multistage systems: Balance the permeate flow
rate

January 20110 67
Each element in a system should operate within
certain limits
 To minimize concentration polarization:
•permeate flow rate below upper limit
•element recovery below upper limit
•concentrate flow rate above lower limit
 To avoid physical damage:
•feed flow rate below upper limit
•pressure drop below upper limit
•feed pressure below upper limit
System design guidelines

January 20110 68
System design guidelines

January 20110 69
 Principle: Elements with the lowest production and highest
rejection in the first positions and elements with the highest
production in the rear positions of the vessel
 Advantages vs. conventional configuration
• Better hydraulics resulting in lower flux in the front modules:
o Lower fouling potential -> lower energy required
o Less cleaning needed -> longer membrane life
• Lower energy requirement for a given production and/or higher
production for a given pressure due to the use of high flow elements
in the rear positions
Configuration – Internally Staged Design
Internally Staged Design (ISD)
Conventional

January 20110 70
6 x SW30HRLE-400i (7,500 gpd)
Recovery system 37.11%
6 x SW30ULE-400i (11,000 gpd)
1 x SW30HRLE-400i + 1 x SW30XLE-400i + 4 x SW30ULE-400i
* Feed pressure: 56 bar
* Feed TDS: 35,000 ppm
* Feed flow: 12,4 m3/h
1 x 7,500 gpd + 1 x 9,000 gpd + 4 x 11,000 gpd
0.3
0.5
0.7
0.9
1.1
1.3
1.5
1.7
1 2 3 4 5 6
Element Position
Permeateflowrate(cmh)
SW30HRLE400i
Maximum Flow
Guideline
0.3
0.5
0.7
0.9
1.1
1.3
1.5
1.7
1 2 3 4 5 6
Element Position
SW30HRLE-400i
SW30ULE400i
Maximum Flow
Guideline
0.3
0.5
0.7
0.9
1.1
1.3
1.5
1.7
1 2 3 4 5 6
Element Position
Internally Staged
Design
SW30HRLE-400i
SW30ULE400i
Maximum Flow
Guideline
Conventional
ISD

January 20110 71
Average Flux of the
vessel (L/m2h)
14 15.76
Maximum permeate
flow per element
0.99 0.99
COST (UScts/m3)
Highest FF & T
60.14 58.27
COST (UScts/m3)
Lowest FF & T
63.65 60.05
% savings on cost of
water*
Highest FF & T
Lowest FF & T
3.1%
5.7%
SW30HRLE-400i SW30XHR-400i SW30ULE-400i
* COST CALCULATION (TOOLS): CAPEX and OPEX are taken into account. Model is prepared by
a Consulting Company* for Dow (John Tonner Water Consultants International Inc.)

January 20110 72

January 20110 73

January 20110 74
 Feedwater Data
 Report
 Cost Analysis

January 20110 75
Example - ROSA Report

January 20110 76
Designs of systems in
excess of the guidelines
results in a warning on the
ROSA Report.

January 20110 77
Warnings and typical solutions – For one stage systems
Design warning Solutions
Max. element permeate flow exceeded 3, 5, 7, 11
The concentrate flow less than minimum 1, 5, 4 together with 6
The feed flow greater than maximum
2 unless the feed flow is
fixed, 3
Maximum feed pressure exceeded 1, 3, 8
Temperature is above acceptable value 10
Max. element recovery exceeded:
• If the problem is encountered in front elements
• If the problem is encountered in rear elements
1, 5, 6, 11
1, 5, 6
Decrease system recovery
Enable a recirculation loop
Pass 1 Conc to Pass 1 Feed
(normally not used for SW appl.)
Decrease the number of
elements per PV (keeping the
same APF*)
Reduce average system flux (add
membranes, PV)
Combine two element types:
lower energy elements in rear
positions (ISD configuration)
Increase the number of
elements per PV (keeping the
same APF*)
Install lower energy
membranes or ISD with lower
energy membranes
Reduce Temp (recommend
customer to reduce temp during
pretreatment).Increase system recovery
Reduce number of PV
(increasing average system flux)
1
2
4
3
6
5
8
7
10
11
Solutions Guide
*APF – Average Permeate Flux

January 20110 78
Warnings and typical solutions – For multistage systems
Design warning Solutions
Max. element permeate flow exceeded 3, (5), 6, 10, 13
The concentrate flow less than minimum
1, 4, (5), 6, 7, (10 and
11 only for the 1st stage)
The feed flow greater than maximum in any of the stages 2, 3
Maximum feed pressure exceeded 1, 3, 9
Temperature is above acceptable value 12
Max. element recovery exceeded:
• If the problem is encountered in front elements (front stage/s)
• If the problem is encountered in rear elements (rear stage/s)
1, (5), 6, 7, 10, 13
1, (5), 7
Solutions Guide
Decrease system recovery
Enable a recirculation loop:
Pass 1 Conc to Pass 1 Feed
(normally not used for SW appl.)
Decrease the number of elements
per PV (keeping the same APF)
Increase number of PV
(reducing average system flux)
Use a lower active area membrane
element (keeping the same APF)
Combine two element types: lower
energy elements in second or third
stages
Increase the number of elements
per PV (keeping the same APF)
Install lower energy membranes or
ISD with lower energy membranes
Reduce Temp (recommend customer
to reduce temp during pretreatment).
Increase system recovery
Reduce number of PV
(increasing average system flux)
1
2
4
3 7
5
9
8 12
11
13
Add backpressure in first and/or
second stages permeate streams
Add booster pump in first or second stage
concentrate
6
10
*APF – Average Permeate Flux

January 20110 79
ROSA – Checking Second Limiting
Scenario: Lowest T + Lowest FF
• Example: Lowest T= 16 ºC, low Flow Factor
To change from one case to
another we can use 3 ways:
1.Click on the drop-down list
2.Move the cursor on the bar
3.Click next to the number
First add a new case, the
previous data will be copied
automatically

January 20110 80
 Feedwater Data
 Report
 Cost Analysis

January 20110 81
Cost Analysis - Element Value
Analysis (EVA)
 The Element Value Analysis (EVA) tool has been added to ROSA
to allow for a snapshot economic comparison of different
elements operating in the same system under the same
operating parameters.
 While RO system modeling software historically provides a
snapshot comparison of the performance parameters such as
feed pressure and permeate quality, EVA provides an added
dimension allowing the system designer to also evaluate the
impact of product selection on the lifetime operational cost of
the system.
 There are a significant number of cost factors outside of RO
element selection; EVA is a comparison tool only and is not a
guarantee of actual capital or operating costs.

January 20110 82
ROSA – Cost Analysis

January 20110 83
Index
 Feedwater Data
 Report
 Cost Analysis
3. Example

January 20110 84
Example - Data for projection
IONS Concentration [ppm]
Barium 0.14
Boron 0.153
Zinc 0.006
Fluoride 0.5
Chloride 34.29
Calcium 9.55
Potassium 0.97
Magnesium 7.2
Manganese 0.002
Sodium 328
Nitrate 2.6
Aluminium 0.001
Iron 0.0121
Sulphate 15.8
Carbonate 0.22
Bicarbonate 871
Silica 15
CO2 363.3
Strontium 10
1. Water analysis
2. Feed:
• Well water
• pre-filtered to 3μm
• TDS=1290 ppm
3. Permeate Flow:
• 92.89 m3/h
4. Recovery: 87%
5. Temperature: 16 and 20ºC
6. Permeate quality:
• TDS < 50 ppm
7. Focus on OPEX

January 20110 85
Example - Membrane Element Selection
According to:
i. System capacity: permeate flow 92.89m3/h, than for flows >
2.3 m3/h the element diameter should be 8.0”
ii. Feed water TDS: TDS=1290 ppm very close to 1000 ppm,
then we can try LE membrane element or in case the permeate
quality is not met try BW30
iii. Feed water fouling potential: well water, conventional pre-
treatment, doesn’t have high biological fouling potential
iv. Required product water quality: conductivity <100 μS/cm
we should meet the quality with LE
v. Energy requirements: LE has lower energy requirements,
than BW30 – we should choose LE

January 20110 86
Example - ROSA - Introduction of known data
In our example we have Brackish
water, therefore we choose 0.95
In our example:
Permeate Flow 92.89 m3/h
Recovery 87%
• Worst scenario in terms of salt passage and hydraulics of the system (High
Temperature + High Flow Factor):

January 20110 87
Example - Configuration Selection
We should choose two stage system – since high recovery
is required

January 20110 88

January 20110 89
Designs of systems in
excess of the guidelines
results in a warning on the
ROSA Report.

January 20110 90
 By adding some back pressure, the first stage will produce less.
Example - ROSA permeate flow balancing
Back pressure valve
De-select the ¨Same back
pressure¨ icon
Introduce the Back
pressure value in the Back
Pressure box

January 20110 91
No design warnings
Water quality with TDS <50 ppm
Back Pressure is added to
the Feed Pressure

January 20110 92
Thank you for your attention!
For more information please visit our web site
or contact your local Dow representative.
http://www.dowwaterandprocess.com/
This presentation is provided in good faith. Dow assumes no obligation or liability.

Rosa introduction for water treatment plant

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