SECTION 1 – GENERAL SPECIFICATION
SYSTEM OUTLINE
This specification covers the requirements for the design and supply of 13 m3/h reverse osmosis for Nijhuis Water Technology Asia Pacific
The plant consists mainly of
- Activated Carbon Filter
- Reverse osmosis system complete with cleaning facilities
Feed water from MBR system flow trough the activated carbon filter and then the water is injected with chemical treatment as follow :
| No | Chemical | Function |
| 1 | H2SO4 | To help membrane prevent from the scaling problem |
| 2 | Hypochlorite | To kill microorganism and hence protect the RO membrane from biological fouling, also act to oxidize solube iron to
protect RO membrane from iron fouling. |
| 3 | Bisulfite | To act as an chlorine scavenger that will remove any oxidants
in the water, to protect RO membranes against any attack by the oxidants |
| 4 | Anti Scalant | To hinder salt crystallization in RO concentrate stream and
thus prevent scaling on RO membrane |
The conditioning water is boosted and fed to the reverse osmosis modules. Under high pressure, the water is forced through the RO membranes. Salts are not permeable and are thus retained on the membrane surface. As such, the water is separated into two streams. One stream will be the water passing through the RO membranes, this stream contains small amount of salts and is termed as the permeate (or product water). The other stream contains the salts and is termed as the concentrate (or reject water)
RO cleaning unit is incorporated in the package. Even though the pretreatment is well designed and incorporated, the RO membrane is still subject to fouling and scaling.
SECTION 2 – DESIGN BASIS
FEED WATER CONDITION
Flow 21 m3/h
Source MBR
FEED WATER QUALITY
|
PARAMETER |
UNIT |
RESULT |
| DEEP WELL | ||
| TDS | mg/L Solid | 1000 |
| TSS | Mg/L solid | 1 |
| SDI | < 3 |
TREATED WATER CHARACTERISTICS
Flow 13 m3/h
TREATED WATER QUALITY (At Permeate of RO)
|
PARAMETER |
UNIT |
RESULT |
| DEEP WELL | ||
| TDS | mg/L Solid | <100 |
SECTION 3 – EQUIPMENT SPECIFICATION
FEED PUMP
Quantity 1 sets (1 duty, 0 stand by)
Type Horizontal end suction
Make Grundfos CR 15-2 or equal
Flowrate 21 m³/hr
Discharge head 30 m
Motor 3 kW, 480V/3ph/60Hz
ACTIVATED CARBON FILTER
Quantity 1 set (1 duty, 0 stand by)
Capacity 21 m3/h
Operation Automatic backwash
Vessel 1700 mm dia x 2400 mm H
Material Mild steel with epoxy painting
Media type Activated Carbon
REVERSE OSMOSIS UNIT
PRE FILTER/CARTRIDGE FILTER
Quantity 1 set
Type Cartridge 5 micron
Service flowrate 21 m³/hr Material of construction
- Housing Stainless steel
- Cartridge 5 micron nominal x 40” Length
Cartridge quantity 7 pcs HIGH PRESSURE PUMP
Quantity 1 set (1 duty, 0 standby)
Type Centrifugal multistage
Make Grundfos CRN15-8 or equal
Flowrate 21 m³/hr
Discharge head 120 m
Material Stainless Steel 304L
Motor 11 kW, 480V/3ph/60Hz
REVERSE OSMOSIS MODULE
Quantity 1 set
Configuration 2 stage
Array 2 : 1
Recovery 65%
Permeate 13 m³/hr
Housing FRP
Make Codeline
Pressure rating 300 psi
Housing quantity 3 pcs
Membrane quantity 15 pcs Membrane specification
Make Dow Filmtec BW30-400 FR
Size 8” x 40”
Type Polyamide Thin-Film Composite Fouling Resistant
Accessories – Vortex,Rosemount Flow meter x 4 nos
- Pressure gauge x 6 nos
- Rosemount Pressure switch x 4 nos
- Rosemount Conductivity meter x 2 no
- Burkert Valves x 1 lot
- Yokogawa pH meter x1
RO CLEANING UNIT
Tank
Quantity 1 set
Type Vertical, cylindrical
Capacity 500 litres
Material PE-Profil Tank
Pump
Quantity 1 set
Type Centrifugal multistage
Make Grundfos CRN15-2 or equal
Flowrate 14 m3/h
Head 36 m
Material Stainless Steel
Motor 3 kW, 480V/3ph/60Hz
CHEMICAL DOSING UNIT
Quantity 4 sets
Chemical H2SO4
Hypochlorite Bisulfite Anti Scalant
DOSING TANK (Per set)
Quantity 1 no
Type Vertical, cylindrical
Capacity 150 litres
Material PE-Profil Tank
DOSING PUMP (Per set)
Quantity 1 no
Type Solenoid drive diaphragm, manual adjustment
Make grundfos or equal
Flowrate 5 l/h (max)
Head 60 m
Material PP
PIPING AND VALVE
Quantity 1 lot
Material PVC Sch 40 (Low Pressure) Stainless Steel (High Pressure)
Main Size 2”, 3”
CONTROL PANEL
Quantity 1 no
Type Indoor
Access Front
Material Mild steel with oven baked epoxy finish Supply voltage 480V/60Hz/3ph/4 wire
PLC Allan Bradley
The control panel shall comprise of following
- One (1) no main circuit breaker with indicating light
One (1) lot motor starter, each consist of isolating switch, contactor, thermal overload relay, selector switch, and indicating lamps
