BW (Brackish Water) membrane is an aromatic polyamide composite membrane element for desalting brackish Water developed by Hangzhou E-MEM Environmental Technology co., LTD.
BW has the characteristics of low operating pressure, high flux, and high rejection rate. It has a high removal rate for dissolved salts, TOC, SiO2, and other substances, especially for the preparation of high purity water in the electronic and power industries.

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E-MEM Membranes

BW has the characteristics of low operating pressure, high flux, and high rejection rate. It has a high removal rate for dissolved salts, TOC, SiO2, and other substances, especially for the preparation of high purity water in the electronic and power industries.

BW series membrane elements are suitable for desalination of surface water, groundwater, tap water, and municipal water with a salt content of less than 8000ppm. They are mainly used in the fields of industrial pure water and power plant boiler make-up water of various fields, as well as brackish water applications such as high-concentration saline wastewater and beverage water manufacturing.

BW has the characteristics of low operating pressure, high flux, and high rejection rate. It has a high removal rate for dissolved salts, TOC, SiO2, and other substances, especially for the preparation of high purity water in the electronic and power industries.
BW series membrane elements are suitable for desalination of surface water, groundwater, tap water, and municipal water with a salt content of less than 8000ppm. They are mainly used in the fields of industrial pure water and power plant boiler make-up water of various fields, as well as brackish water applications such as high-concentration saline wastewater and beverage water manufacturing.

Applications

 

Domestic Water Treatment

 

Commercial Water Treatment

 

Industrial Water Treatment

Performance parameters of the membrane element

Models	Permeate Flow GPD（m3/d)	Salt rejection（%）	Active membrane area ft2 (m2)	Testing pressure Psi (MPa)	Testing condition
BW-4040	2400(9.1)	99.5	90.4(8.4)	225(1.55)	2000ppm NaCl
BW-365	9500(36.1)	99.5	365(34.0)	225(1.55)	2000ppm NaCl
BW-400	10500(39.7)	99.5	400(37.0)	225(1.55)	2000ppm NaCl
Other Testing Condition (˚C)	Tempetaure (˚C)	25.0 ±1.0
	Feedwater pH	7.5±0.5
	recovery（%）	15.0±1.0
available	Dry & Wet

Specification And Size

(A)

(B)

E-MEM® (BW) Series Membrane Size

Model	A(±2.0mm)	B(±1.0mm)	C(±0.1mm)	D(±0.1mm)	Pic
BW-4040	1016	100	19.1 (OD)	26.7	a

How An RO Membrane Is Made

Below is a video that explains how an RO membrane is made

https://youtu.be/c640QM5Ccyw

How An RO Membrane Works

Below is a video that explains how an RO membrane works

https://youtu.be/jOYZWPhjUI4

Ultimate service conditions

• Max. operating pressure : 600psi（4.14MPa)


• Max. feed water temperature : 45℃


• Max. feedwater.  flow: 75GPM（17m³/h）（BW-365、BW-400）16GPM（3.6m³/h）（BW-4040）


• Max. feed SDI 15: 5


• Feed free chlorine concentration: ＜0.1ppm


• pH range, continuous running: 3~10


• Feed PH range when chemical cleaning: 2~12


• Maximum pressure drop(single-membrane): 15 psi (0.1MPa)

Matters Needing Attention

1. The data and information provided by Hangzhou-MEM Environmental Technology Co., Ltd in this sample are all obtained through long-term experiments, and we are convinced that these data and information are accurate and effective. Customers are requested to use the product in strict accordance with the design, use, and maintenance requirements of the product and keep relevant data records. Hangzhou E-MEM Environmental Technology Co., Ltd shall not bear any consequences arising from customers' failure to use and maintain the products in accordance with the conditions provided by this sample.


2. The permeate flow listed in the table is the average value, and the deviation of a single membrane element of permeate flow is±15%.


3. Before products leaving the factory, the dry membrane element has no protective liquid, while the wet membrane element is stored and treated with 1.0% sodium bisulfite (10% glycerin antifreeze added in winter) solution and vacuum-packed.


4. Dry membrane elements should always be kept wet after wetting. When wet membrane element is not used for a long time, in order to prevent the growth of microorganisms, it is recommended to soak the membrane element with protective liquid containing 1.0% sodium bisulfite (food grade)(prepared with RO production water).


5. For initial use of membrane elements, it is recommended to flush first at low pressure for 15-25 minutes and then at high pressure for 60-90 minutes (water production not less than 50% of the system design).All production and concentrated water shall be discharged within the first hour of membrane element operation.


6. It is prohibited to add any chemical agent that has an impact on the membrane element in storage and operation. If such chemical agent is violated, Hangzhou E-MEM Environmental Technology Co., Ltd will not bear all the consequences arising therefrom.