Ultra-low Pressure Spiral RO Membrane Element
ES20-D

99.7% Nacl rejection at 0.5-0.6 MPa ultra-low pressure operation.

Outline

ES20-D is a fully aromatic polyamide ultra-low pressure spiral RO membrane element suitable for applications such as primary desalination of ultrapure water production systems and desalination of brackish water. Its excellent features allow drastic reduction in electric consumption, facility costs such as pumps and piping, and saves rired installation space.

Features

• The NaCl rejection is as high as 99.7%
• Enables extremely low-pressure operations at 0.5-0.6MPa.

Sizes

ES20-D8	Φ201×1,016L[mm]
ES20-D4	Φ99.5×1,016L[mm]

Performance

Element	Rejection [％]		Permeate Flow[m3/d]
	Nominal	Minimum	Nominal	Minimum
ES20-D8	99.7	99.5	30	26
ES20-D4			6	5.5

[Evaluation conditions]

Evaluation solution 0.05% NaCl water solution

Operating pressure: 0.7MPaWater

temperature:25°C

Recovery rate: 10～20%

[Membrane surface area]

Effective membrane surface area based on the product design.

*The above values are sample observed values, not the guaranteed performance.

An example of desalination performance (4 inch element)

Element	Water	Pressure	Rejection [%]
			Electric conductivity	TDS
ES20-D4	*Well water	0.5MPa	96.9	99.6
	*Tap water		98.6
NTR-759HR-S4	Well water	1MPa	96.9	99.6
	Tap water		98.6	99.5

[Remarks]

*Well water: Well water in Nitto Denko Shiga Plant (Electric conductivity 9.5ms/m) Operating conditions: Temperature 16°C Recovery rate 14%

*Tap water : Tap water in Nitto Denko Shiga Plant (Electric conductivity 20ms/m) Operating conditions: Temperature 16°C Recovery rate 14%

Operating Conditions

Item		Unit	Recommended operating condition	Usage Limit
Operating pressure		MPa	Set according to the designed flux	Max.4.1
Operating temperature		°C	5～30	Max.4.1
Turbid content in feed water as FI value		-	≦3	Max.4
Concentration of residual chlorine		mg/L	0	Max.1.0(during cleaning)
pH range		-	6～8(permissible range: 2～10)	1～11 (during cleaning)
Feed flow rate		L/min	-	Max. 245 (48 for4")
Concentrate flow rate			75～85 (15-25 for 4")	Min. 56 (12 for 4")
Pressure drop	1 element	KPa	＜50	Max.82
	Over 5 element		＜200	Max.420

[Remarks]

*Above figures are only for the purpose of guidelines and not the guaranteed figures.