RO Membrane│TOYOBO BRACKISHWATER DESALINATION│Water Treatment Membrane │TOYOBO

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Water Treatment Membrane

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Feature

TOYOBO MC's RO membranes

"HOLLOSEP®" is a membrane element/module produced by winding hollow-fiber membranes of cellulose triacetate in a cross-wound arrangement. "HOLLOSEP®" is mainly used to treat brackish water and seawater.
Spiral-wound RO elements are produced using flat-sheet type polyamide membranes, and they are mainly applied to brackish water treatment.

HOLLOSEP® : Hollow fiber, Cellulose triacetate

"HOLLOSEP®" is a reverse osmosis membrane module that produces high purity production water by rejecting ions. "HOLLOSEP®" has a greater surface area which is a key factor in better tolerance against potential fouling in the RO module. If the same amount of fouling material is present in the feed water, the much larger surface area of hollow fiber type membrane will be subjected to much less surface fouling than the spiral wound type membrane. In addition, membrane chemistry based on cellulose triacetate is compatible with chlorine disinfectant during routine operation. These two strong features easily eliminate bio-fouling problems, the greatest concern in seawater desalination.

Spiral-wound RO element : Flat sheet, Polyamide

  • 8-inch and 4-inch spiral-wound RO elements are used for treating brackish water, wastewater, industrial water, etc.

Specifaction・Quality

  • ●HOLLOSEP®
  • ●Spiral-wound RO element

HOLLOSEP®

Brackish water : Hollow fiber, Cellulose triacetate

  • ●RO module
Type Model Product Flow
rate (Nominal)*1		 Salt Rejection
(Nominal)*1, *2		 Test
conditions		 Maximum
operating pressure		 Size
(Diameter × Length)		 Data sheet
m3/day % MPa mm × mm
Low- pressure HA3110 0.9 94 A 1.5 90 × 420 PDF
HA5110 2.5 94 A 1.5 140 × 420 PDF
HKC3035V (54 L/min) 94 B 0.7 103 × 880  
HKC3043V (69 L/min) 94 B 0.7 103 × 1100  
Inter-mediate pressure HA5230 15 94 C 3.9 150 × 840 PDF
HA5330 24 94 C 3.9 150 × 1240 PDF
HA8130 60 94 C 3.9 295 × 1320 PDF

Test condition

(A) Feed water pressure 0.98 MPa, Feed water concentration 500 mg/L as NaCl, Feed water temperature 25 deg.C, Recovery rate 30%
(B) Feed water pressure 0.49 MPa, Feed water concentration 500 mg/L as NaCl, Feed water temperature 25 deg.C, Recovery rate 30%
(C) Feed water pressure 2.94 MPa, Feed water concentration 1,500 mg/L as NaCl, 25 deg.C, Recovery rate 75%

  • *1：The product flow rate and the salt rejection indicate values obtained under the test conditions two hours after putting the module into initial operation.
  • *2：The salt rejection defines the product quality and is indicated in the following formula.
    (1 - salt concentration in product water / salt concentration in feed water) x 100 [%]

Seawater : Hollow fiber, Cellulose triacetate

  • ●RO element
The following models are provided as elements only.
Pressure vessels need to be prepared by customer side.
Type Model Product Flow
rate (Nominal)*1		 Salt Rejection
(Nominal)*1, *2		 Maximum
operating pressure		 Size
(Diameter × Length)		 Data sheet
m3/day % MPa mm × mm
HE HE10155 59 99.6 6.86 396 × 4746 PDF
HU HU10155 47.5 99.6 6.86 396 × 4746 PDF
HL HL10155 47.5 99.6 6.86 380 × 4433 PDF

Test condition

Feed water pressure 5.39 MPa, Feed water concentration 35,000 mg/L as NaCl, Feed water temperature 25 deg.C, Recovery rate 30%

  • *1：The product flow rate and the salt rejection indicate values obtained under the test conditions two hours after putting the module into initial operation.
  • *2：The salt rejection defines the product quality and is indicated in the following formula.
    (1 - salt concentration in product water / salt concentration in feed water) x 100 [%]
  • ●RO module
Type Model Product Flow
rate (Nominal)*1		 Salt Rejection
(Nominal)*1, *2		 Maximum
operating pressure		 Size
(Diameter × Length)		 Data sheet
m3/day % MPa mm × mm
HR series HR3155 0.4 99.6 5.9 104 × 400 PDF
HR5155 1.2 99.6 5.9 153 × 444 PDF
HR5255 3 99.6 5.9 153 × 825 PDF
HR5355 5 99.6 5.9 153 ×1230 PDF
HR8355 12.0 99.6 5.9 305 ×1291 PDF
HM HM10255 45 99.6 6.86 390 × 2863 PDF
HJ HJ9155 34 99.6 8.23 294 × 2051 PDF
HB series HB9155 15 99.6 8.23 278 × 1498 PDF
HB10255 67 99.6 8.23 400 × 2875 PDF

Test condition

Feed water pressure 5.39 MPa, Feed water concentration 35,000 mg/L as NaCl, Feed water temperature 25 deg.C, Recovery rate 30%

  • *1：The product flow rate and the salt rejection indicate values obtained under the test conditions two hours after putting the module into initial operation.
  • *2：The salt rejection defines the product quality and is indicated in the following formula.
    (1 - salt concentration in product water / salt concentration in feed water) x 100 [%]

Spiral-wound RO element

Brackish water: Flat sheet, Polyamide

Type Model Diameter Product Flow
rate (Nominal)		 Salt Rejection
(Nominal)*1		 Test conditions Feed spacer thickness Data sheet
inch m3/day GPD % mil
Standard SB815-1 8 39.7 10,500 99.6 D 28 PDF
SB415-1 4 9.5 2,500 99.6 D 28 PDF
High flux SB815HF 8 49.2 13,000 99.5 D 28 PDF
SB415HF 4 11.0 2,900 99.5 D 28 PDF
High flux & Ultra low pressure SB810HF 8 47.3 12,500 99.5 E 28 PDF
SB410HF 4 10.2 2,700 99.5 E 28 PDF
Fouling resistance SL815 8 35.9 9,500 99.7 D 34 PDF
SL415 4 7.6 2,000 99.6 D 34 PDF
High flux & fouling resistance SL815HF-2 8 43.5 11,500 99.75 D 34 PDF
SL415HF-2 4 8.7 2,300 99.6 D 34 PDF

Test condition

(D) Feed water pressure 1.55 MPa, Feed water concentration 2,000 mg/L as NaCl, Feed water temperature 25 deg.C, Recovery rate 15%
(E) Feed water pressure 1.03 MPa, Feed water concentration 1,500 mg/L as NaCl, Feed water temperature 25 deg.C, Recovery rate 15%

  • *1：The salt rejection defines the product quality and is indicated in the following formula.
    (1 - salt concentration in product water / ((salt concentration in feed water+ salt concentration in brine water)/2)) x 100 [%]

Applications

In Japanese markets, "HOLLOSEP®" has been adopted for Fukuoka seawater desalination plant in which the daily production capacity of 50,000 m3/day boasts the largest scale in Japan and the operating recovery of 60% for RO process is one of the highest levels of efficiency in the world.

  • ● In overseas markets, proven records are exhibited; for example, in Shuqaiq and Jeddah, Saudi Arabia, high-quality drinking water of 240,000 m3/day and 260,000 m3/day are being produced respectively. These locations are characterized by high-temperature and high-salt concentration seawater that present the tough conditions to the reverse osmosis membrane process.
  • ●Toyobo MC's "HOLLOSEP®" RO membrane elements have been selected for use at Ras Al Khair Plant, which is one of the largest seawater desalination plants in the world, with a production capacity of 1,000,000 m3 of freshwater per day. Within the total daily output of 1,000,000 m3 of freshwater, 345,000 m3 is produced by the RO method using Toyobo MC's RO modules and the rest is produced by the multi-stage flush (MSF) method.

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