About Us
Honor
Industry
Products & Services
Development
Download
News
Contact

- Chinese
- English

Versatility and Customization
WELKIN thin-film composite membranes exhibit outstanding performance and are suitable for a wide range of applications, including low-pressure municipal water use, seawater desalination, brackish water purification, chemical production, and waste treatment. Customized membrane elements can be provided to meet the specific requirements of each application.

Lasting stability
Non-chlorine treatment ensures both short-term and long-term high performance, as well as sustained, stable performance over the long run.

Accuracy and Consistency
Leveraging a self-developed integrated composite membrane manufacturing process, the entire membrane production process is precisely controlled by a DCS system, with more than 4,000 process control points.

High resistance to fouling and chemical cleaning
This component delivers efficient cleaning across a broader pH range, helping to reduce cleaning frequency and energy consumption.

Membrane Oxidation Mechanism Based on Residual Chlorine

Performance Parameters of Reverse Osmosis Elements
Reverse Osmosis (RO) Element (Environment)

Model	Stable desalination rate	Minimum desalination rate	Water production flow		Effective area		Feed concentration	Feed pressure
Model	%	%	GDP	m³/d	square feet	square meters	mg/L	psi	megapascal
BW-8040	99.5	99.3	11500	43.5	400	37.2	2000	225	1.55
BW-8040HR	99.8	99.5	10500	39.7	400	37.2	2000	225	1.55
BW-4040	99.5	99.3	2500	9.5	90	8.4	2000	225	1.55
BW-4040HR	99.8	99.5	2500	9.5	90	8.4	2000	225	1.55
UPL8040	99.2	99.0	2700	48.1	400	37.2	1500	150	1.03
UPL4040	99.2	99.0	2600	9.8	90	8.4	1500	150	1.03

Performance Parameters of Reverse Osmosis Elements
Reverse Osmosis Elements for Special Separation (Thermally Sterilizable)

Model	Stable desalination rate	Water production flow		Effective area		Operation pH range	Feed concentration	Feed pressure		Recovery rate
Model	%	GDP	m³/d	square feet	square meters	Operation pH range	mg/L	psi	megapascal	%
HS8040	98.5	9000	34.1	400	37.2	2-11	NaCl:2000	150	1.03	15%
HS4040	98.5	2100	7.9	90	8.4	2-11	NaCl:2000	150	1.03	15%

Feed Quality Requirements for Reverse Osmosis Membrane Systems
Reverse osmosis membranes have stringent requirements for feedwater quality, which is critical for maintaining excellent separation performance, extending membrane life, and reducing operating costs.

Indicator		Water Quality Requirements	Potential Consequences of Non-Compliant Water Quality	Improvement Suggestions
Suspension Solid	Turbidity	<1.0 NTU	Sludge and colloid contamination	Flocculation and Filtration
Suspension Solid	SDl₁₅	<5	Sludge and colloid contamination	Flocculation and Filtration
Metal oxide	Iron (mg/L)	<0.05	Iron Pollution	Oxidation
Metal oxide	Manganese (mg/L)	<0.05	Manganese Pollution	Add a pre-filter before the ultrafiltration or multi-media filter.
Limescale Substance	Calcium carbonate	LSI < 0	Scaling is not permitted on the concentrate side.	Reduce the concentrate recovery rate, adjust the pH, or add scale inhibitors.
Limescale Substance	Other insoluble salts	/	Scaling is not permitted on the concentrate side.
Organic matter	Oil	0	Organic and Oil Pollution	Air flotation
	TOC (mg/L)	<10	Organic pollution	Activated carbon adsorption and filtration
	COD (mg/L)	<20
	BoD₅ (mg/L)	<10
Silicon (mg/L)		<20	Both excessively low and excessively high pH levels can accelerate aging.	Acid-Base Regulation
pH value		3-10	Colloidal contamination	Activated carbon adsorption and filtration
Temperature		5–45°C	Low temperatures can easily lead to the formation of insoluble salt scale, while high temperatures accelerate membrane aging.	Heat exchanger temperature control
Oxidizing agent	Free Chlorine Tolerance (mg/L)	<0.1	The membrane system will be oxidized.	Reductant or activated carbon adsorption
Oxidizing agent	Ozone and others	0	The membrane system will be oxidized.	Reductant or activated carbon adsorption

Keywords:

Welkin

Hollow-Fiber Polyethersulfone Nanofiltration

Sanitary Centrifugal Pump

Reverse Osmosis Membrane

sales@welkin-cn.com

0510-85258905

Product Category:

Clean Fluid Equipment

Product Inquiry Related Products

Product Inquiry

Please leave your contact information, and our dedicated professionals will get in touch with you as soon as possible!

Submit


Purified Water Preparation System	Water for Injection Preparation System

Ambient Membrane WFI Preparation System	Pure Steam Generator


Bioreactor	Upstream/Downstream Piping & Tanks

High-Pressure Homogenizer System	Ultrafiltration System


Sanitary-grade container	Electrolytic Ozone Generator

Hygienic Bottom-Mount Magnetic Stirrer	Sanitary Centrifugal Pump