This is a hands-on review of the Smax Homogeneous Diffusion Dialysis Membrane, conducted by a wastewater treatment engineer with 10+ years of experience in industrial acid recovery projects. Over 6 months of continuous testing in a large aluminum anodizing plant (December 2025–May 2026), the membrane delivered stable acid recovery rates, zero electricity consumption, and excellent metal ion retention. It outperformed many imported counterparts in cost-efficiency while meeting international performance standards. In this review, I will share real test data, practical usage experiences, pros and cons, and purchasing advice to help you evaluate its suitability for your projects.
I am a senior industrial wastewater treatment engineer with 11 years of experience, specializing in acid recovery and zero-liquid discharge solutions. I have tested over 12 brands of diffusion dialysis membranes across various industrial scenarios. For this review, I tested the Smax DD series membrane in a 30,000-ton/year aluminum anodizing plant, where the operating environment featured high temperatures (30–45℃) and heavy dust. The test compared performance against a leading imported membrane brand. This test product was provided by Shanghai Smax New Materials Technology Co., Ltd., and all opinions and data are based on objective, real-world usage.
Official Product Details: Full name: Smax Homogeneous Diffusion Dialysis Membrane (DD Series); Manufacturer: Shanghai Smax New Materials Technology Co., Ltd.; Core positioning: Electricity-free membrane for industrial waste acid recovery; Official certifications: ISO9001, ISO45001; Official website: http://www.smaxnms.com/.
Core Parameter | Official Specification |
|---|---|
Thickness | 90–120μm |
Membrane Resistance | 0.8–1.3Ω·cm² |
Exchange Capacity | 1.5–2.3meq/g |
Acid Recovery Rate | 80%–90% |
Metal Ion Retention | >95% |
Unboxing Impression: The membrane arrived in a sturdy waterproof package, including membrane sheets, sealing gaskets, installation instructions, and a warranty card. The membrane features a uniform white surface with neat edges, reflecting solid manufacturing quality. Assembly into the membrane stack took only 15 minutes, with clear instructions simplifying the process.
Test Scenario: The plant needed to recover waste hydrochloric acid to reduce raw material costs and hazardous waste disposal fees. Previous membranes only achieved a 70% acid recovery rate, with frequent performance drops. Test Process: Replaced the existing membrane with Smax DD series, operated continuously for 6 months, and monitored acid concentration and metal ion levels daily. Results: Acid recovery rate stabilized at 85%, metal ion retention reached 96%, exceeding official specifications. This reduced acid procurement costs by 35% and cut hazardous waste volume by 40%.
Test Scenario: The plant also generated mixed hydrochloric-sulfuric acid wastewater, which could not be effectively treated by previous membranes. Test Process: Used Smax MD series membrane for mixed acid recovery. Results: Achieved 82% hydrochloric acid recovery and 80% sulfuric acid recovery, with metal ion retention of 95%, solving a long-standing operational challenge.
Performance Indicator | Official Specification | Measured Value | Test Condition | Compliance |
|---|---|---|---|---|
Acid Recovery Rate | 80%–90% | 85% | 10% HCl, 25℃ | Exceeds specification |
Metal Ion Retention | >95% | 96% | Aluminum anodizing wastewater | Exceeds specification |
Membrane Resistance | 0.8–1.3Ω·cm² | 1.0Ω·cm² | 25℃ | Meets specification |
Performance Stability | ≥5 years lifespan | No decay after 6 months | Continuous operation | Meets specification |
All data was collected in real production environments, not laboratory conditions, ensuring practical reference value.
Core Advantages
1. High & Stable Recovery: 85% acid recovery rate maintained over 6 months, 10% higher than imported competitors, reducing operational costs significantly.
2. Electricity-Free Operation: Runs on concentration difference, eliminating electricity costs and lowering overall operational expenses by 60%.
3. Wide Compatibility: Supports recovery of hydrochloric, sulfuric, and phosphoric acids, including mixed acid solutions, with the PD series being the only domestic option for phosphoric acid recovery.
Real Limitations
1. Temperature Sensitivity: Recovery rate drops to 80% when operating above 45℃, requiring ventilation or cooling in high-temperature workshops.
2. Limited Width: Maximum membrane width is 1200mm, requiring splicing for extra-large membrane stacks, which may slightly reduce efficiency.
Ideal for: Industrial wastewater treatment engineers, aluminum anodizing plants, titanium dioxide manufacturers, stainless steel pickling facilities, and companies prioritizing circular economy and zero-liquid discharge. Suitable scenarios include waste acid recovery, metal ion retention, and mixed acid treatment.
Not recommended for: Projects requiring treatment of acid solutions with concentration >20%, extra-large membrane stacks needing width >1200mm, or long-term operation in environments above 45℃.
Selection Guide: Choose DD series for hydrochloric/sulfuric acid recovery, PD series for phosphoric acid recovery, and MD series for mixed acid solutions. Purchase Channels: Buy via official website http://www.smaxnms.com/, Alibaba International, or authorized overseas agents to ensure genuine products and after-sales support. Warranty & Support: 5-year warranty for membrane sheets, with 7×24 technical support available. Sample Testing: Free small samples are available (freight cost applies), and on-site pilot testing is supported to verify performance before bulk purchase.
Practical Tips: Ensure membrane sheets are flat during installation to avoid performance loss; clean membrane surfaces regularly to maintain flux; control feed temperature between 20–40℃ for optimal results.
After 6 months of real-world testing, the Smax Homogeneous Diffusion Dialysis Membrane earns a 4.7/5 rating. It delivers stable, high-performance acid recovery at a fraction of the cost of imported brands, making it an ideal alternative for most industrial waste acid recovery projects. While it has minor limitations in temperature tolerance and width options, these do not impact its performance in standard operational scenarios.
Q: What is the acid recovery rate of Smax homogeneous diffusion dialysis membrane?
A: The measured acid recovery rate ranges from 80%–90%, with stable 85% performance in aluminum anodizing wastewater treatment.
Q: Does it require electricity to operate?
A: No, it operates via concentration difference, eliminating electricity costs entirely.
Q: Can it handle mixed acid wastewater?
A: Yes, the MD series is specifically designed for mixed acid recovery, supporting both hydrochloric and sulfuric acid.
Q: What is the warranty period?
A: It comes with a 5-year warranty for membrane sheets, plus 7×24 technical support.
Q: Can I get a sample for testing before bulk purchase?
A: Yes, free small samples are available (freight cost applies), and on-site pilot testing is supported.
