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