Description

Skid-Mounted Double-Pass RO System – High Purity Water for Electronics & Pharmaceutical Industries

In recent years, surface water purification with ultrafiltration membrane has become an attractive alternative to conventional clarification. No or less need of chemical agents, good quality of produced water independent of feed water quality, good removal efficiency towards microorganisms, less production of sludge, compact process, and easy automation are some of the advantages of ultrafiltration compared to conventional treatment. Originally, ultrafiltration was used to remove turbidity and microorganism from good-quality surface water. Nowadays the main goal is to improve this technology and to apply it to worse quality sources for the removal of microorganisms, natural organic matter (NOM), Total Organic Carbon (TOC) including particulate organic carbon (POC) and dissolved organic carbon (DOC), disinfection by-products (DBPs) and other components.

Product Overview

Certain industries can't compromise on water quality. Electronics manufacturing, semiconductor fabrication, pharmaceutical production, and laboratory applications all require water that is not just clean but ultrapure. That means conductivity in the microsiemens range, complete removal of dissolved ions, and zero tolerance for contamination.

Single-pass reverse osmosis systems produce good quality water—typically 5 to 10 µS/cm conductivity. That's perfectly adequate for many industrial applications. But when you need water with conductivity below 0.5 µS/cm, or when you're feeding an EDI or electrodeionization system, a single-pass RO simply doesn't get you there.

The DAGYEE Double-Pass RO System is the answer. By passing the permeate from the first RO bank through a second RO bank, this system achieves the ultra-low conductivity and high purity that demanding applications require. It is designed for semiconductor fabs, pharmaceutical manufacturing, power generation, and laboratories where water quality directly impacts product quality.

If you're building a new facility or upgrading an existing water treatment train, this system delivers the performance you need with the reliability you expect.

Why a Containerized System?

There are plenty of reasons to put a water treatment plant inside a shipping container. Here are the ones that matter most:

Speed of Deployment
A conventional water treatment plant takes months to design, build, and commission. A containerized system takes days to ship and hours to commission. When water is urgently needed, that difference is everything.

Complete Mobility
The system is built to move. A flatbed truck delivers it. A crane sets it down. When the project ends, the same truck takes it to the next site. The equipment doesn't get left behind—it follows the work.

Minimal Civil Works
No foundations. No buildings. No permanent utilities. Just a reasonably level piece of ground, a water source, and a power connection. That's all it takes.

Plug-and-Play Simplicity
Everything is pre-installed and pre-wired inside the container. The operator doesn't need to be a water treatment specialist. The system is designed to be operated by someone with basic training. Connect the hoses, turn it on, and let it run.

Weather Protection
The container provides built-in shelter for all equipment. Rain, dust, wind, and extreme temperatures don't affect performance. The system operates reliably in conditions that would shut down an open-air plant.

Security
The container is lockable, providing physical security for equipment in remote or unstable locations. Vandalism and theft are real concerns in some settings—a shipping container offers practical protection.

Working Principle

The double-pass configuration adds a second stage of reverse osmosis for polishing.

First Pass
Feed water (typically pre-treated by UF or media filtration) enters the first RO bank. The membranes remove 95-98% of dissolved salts, organic matter, and bacteria. The permeate from the first pass has conductivity of 3 to 10 µS/cm—good, but not yet high purity.

Permeate Collection
The first-pass permeate is collected in an intermediate tank. This tank serves two purposes: it provides buffer capacity between the two passes, and it allows the pH to be adjusted for improved second-pass performance. Sodium hydroxide may be dosed into the intermediate tank to convert carbon dioxide to bicarbonate, which the second-pass membranes can reject more effectively.

Second Pass
The first-pass permeate is pumped through a second RO bank at lower pressure than the first pass. The second-pass membranes remove the remaining dissolved ions, producing water with conductivity below 0.5 µS/cm. The second-pass reject is returned to the feed of the first pass for recovery, minimizing water waste.

Final Quality
The final permeate from the second pass has conductivity typically between 0.1 and 0.5 µS/cm. This water is suitable for most high-purity applications and serves as excellent feed for EDI or mixed-bed ion exchange if even higher purity is required.

Why Two Passes?
A single pass of RO can achieve about 98% salt rejection. The second pass rejects the remaining salts, giving overall rejection of 99.7% or better. The result is water quality that meets the most demanding standards without the chemical handling and regeneration of ion exchange.

System Components

What This System Removes

The Compact UF System is a physical barrier. It removes anything larger than its pore size. Here's what that means in practical terms:

Product Features & Advantages

Ultrafiltration offers numerous advantages in water treatment, making it an increasingly popular choice for municipal  and industrial applications. Hollow fiber UF membranes provide a physical barrier to suspended solids and pathogens to consistently produce a high-quality, low-turbidity, and low-SDI effluent.

Here are the key benefits of implementing an ultrafiltration system:

Pressurized or immersed membranes to suit the site requirements.
Greater output in the same footprint and helps reduce capital and lifecycle costs for the application.
Physical UF barrier provides consistent high-quality effluent exceeding stringent regulatory requirements through virtually any change in raw-water quality.
Low lifecycle cost optimized through extended membrane life and low energy and chemical use.
These benefits make ultrafiltration an attractive option for various water treatment applications, from municipal water supplies to industrial process water.

Technical Specifications

Parameter	Specification
Model Number	MOD-UF-2026-02A
Filtration Precision	0.01 ~ 0.02 micron
Membrane Material	PVDF
Membrane Configuration	Hollow Fiber (HFF)
Fiber Inner / Outer Diameter	0.6~1.0 / 1.0~1.6 mm
Operation Mode	Inside-out / Outside-in
Operating Pressure	1.4 ~ 3.5 bar (20 ~ 50 psi)
Max Operating Pressure	6.0 bar (87 psi)
Operating Temperature	2 ~ 38 C (35 ~ 100 F)
Max Temperature	45 C (113 F)
Operating pH Range	2 ~ 13
pH Range (Cleaning)	1 ~ 14 CIP
Recovery Rate	85% ~ 95%
Permeate Turbidity	< 0.1 NTU
Permeate SDI	< 1 RO Feed
Bacteria / Virus Removal	> 99.99%
Chlorine Tolerance	> 2,000 ppm Continuous
Power Supply	220V/380V +-10%, 50/60Hz, 3 Phase
Control System	Siemens/Omron PLC + 7" HMI
Protection Class	IP54 / IP65 (Optional)
Membrane Life Expectancy	3 ~ 5 years

What Does Ultrafiltration Remove?

Ultrafiltration is highly effective at removing a wide range of contaminants from water. Here's a breakdown of what an ultrafiltration water filter can typically remove:

1. Particulate matter:
Suspended solids
Colloids
Turbidity
2. Microorganisms:
Bacteria (99.99% removal)
Protozoa (including Giardia and Cryptosporidium)
Many viruses
3. Organic compounds:
High molecular weight organics
Some humic substances
4. Inorganic compounds:
Some heavy metals, when bound to organic matter or particles
5. Other contaminants:
Algae
Some parasites
It's important to note that while ultrafiltration is highly effective at removing many contaminants, it does not remove contaminants like dissolved salts, organic molecules, or ions smaller than the pore size. Additional treatment methods like reverse osmosis or ion exchange may be necessary for these.

Industry Application

Operation & Maintenance

Routine maintenance is straightforward and primarily automated:

• Daily Inspection – Check TMP, flow rates, and pump condition

• Backwashing – Automatic, every 15~60 minutes, duration 60~120 seconds

• Chemical Enhanced Backwash (CEB) – Weekly, using NaClO (50~200 ppm) and/or citric acid

• CIP Cleaning – Every 1~6 months, circulating NaClO and acid solutions

• Membrane Integrity Test – Quarterly, using pressure decay or bubble point test

• Membrane Replacement – Typically every 3~5 years, depending on feed water quality and operating conditions

Why Choose DAGYEE High-Recovery UF?

Feature	Customer Value
Energy Efficiency	40-60% lower energy consumption than conventional UF systems
Water Conservation	95-98% recovery reduces freshwater intake and wastewater discharge
Low Operating Pressure	0.5-1.5 bar operation extends membrane life and reduces wear
Smart Automation	TMP-based backwash optimization saves water, chemicals, and energy
Sustainability	Reduced carbon footprint and water footprint for corporate ESG goals
Fast Payback	1-2 year payback on the additional investment over conventional UF
Global Support	Technical support, commissioning, and spare parts worldwide

Contact Us

The DAGYEE Double-Pass RO System delivers the high purity water that demanding industries require. Built with premium components, intelligent controls, and energy-efficient design, it provides reliable performance and consistent quality.

Contact our team for a customized system design for your specific application and capacity requirements.

Membrane solutions for a changing world.

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