The acid-resistant membrane is a high-performance separation material specifically developed for the resource recovery of acidic wastewater.
Through innovative membrane materials and module design, it can operate stably in highly acidic environments. The system significantly reduces the generation of hazardous waste during wastewater treatment, lowering environmental pressure and disposal costs. At the same time, it enables the recovery and reuse of acids and salts, overcoming the limitations of traditional neutralization methods while improving overall efficiency and economic value.
The acid-resistant membrane features a multi-layer composite structure, consisting of an acid-resistant desalination layer, an ultrafiltration support layer, and a nonwoven backing.
Under pressure-driven conditions, water and small molecules permeate through the membrane, while larger molecules and impurities are retained, enabling the separation and purification of acidic solutions.
The acid-resistant desalination layer offers excellent corrosion resistance and maintains structural stability even at high acid concentrations. Selective separation allows efficient fractionation and recovery of acids and salts.
l Excellent Acid Resistance: Withstands acid concentrations up to 20%, suitable for harsh acidic environments.
l Strong Resource Recovery Capability: Enables the production of ferrous sulfate and concentrated acids for reuse during treatment.
l Low Operating Cost: Reduces chemical dosing and waste disposal, lowering overall operating expenses.
l High Economic Value: Converts waste acid into reusable resources, improving resource utilization.
Stable Structure: Multi-layer composite design ensures long-term stable operation under complex conditions.
l Mining Wastewater Treatment: Purification and resource recovery of acidic wastewater from mining operations.
l Mineral Processing Wastewater: Separation, concentration, and recycling of acidic solutions.
l Metal Processing Wastewater: Treatment and reuse of pickling wastewater and surface treatment effluents.
l Pulp and Paper Industry: Purification of acidic wastewater generated during paper production.
l Textile and Dyeing Wastewater: Separation and resource recovery of acidic effluents from dyeing and finishing processes.
| Item | Value |
| Membrane Material | Acid-resistant Nanofiltration Membrane |
| Max Operating Pressure | 90 bar |
| Membrane Area per Element | 15.0 m² (199 membrane sheets) |
| Flux Range | 5–30 LMH (depending on water quality) |
| Feed Flow Rate | Recommended 650–900 L/h, max ≤1000 L/h |
| Recovery Rate | ＜45% per element (depending on water quality) |
| Salt Rejection | Min. 92%, Stable 94% |
| Average Pressure Drop per Element | 2–4 bar |
| Flow Channel Width | 1.8 mm |
| Chlorine Tolerance | ＜0.1 ppm (complete removal recommended) |
| Operating Temperature | ＜45°C |
| Acid Resistance | H₂SO₄ ≤20%; HCl ≤20%; HNO₃ ≤5% |
| Weight | Dry: 99 kg; Wet: 139 kg |
| Test Conditions | 2000 ppm MgSO₄ solution, 25°C, pH 7.0±0.5, feed pressure 5 bar, 30% recovery |
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