MBR Membrane Module Selection and System Configuration Guide

1. Membrane Module Classification

1. By membrane material
• PVDF membrane: excellent chemical stability, oxidation resistant, lifespan of 5-8 years, most widely used
• PTFE Membrane: Best fouling resistance, lifespan 8-10 years, higher cost
• PE Film: Hydrophilic, low cost, lifespan 3-5 years

2. By Component
• Flat Sheet Membrane: Excellent fouling resistance, easy to clean, ideal for high-concentration wastewater
• Hollow-fiber membrane: High packing density, compact footprint; ideal for domestic sewage.
• Tubular membranes: Best fouling resistance, high cost, less common

II. Selection Criteria

1. Select based on wastewater type
• Domestic sewage: PVDF hollow fiber membrane, pore size 0.1-0.2 μm
• Industrial Wastewater: PVDF Flat Sheet Membrane, Pore Size 0.1μm
• High-difficulty wastewater: PTFE flat sheet membrane, pore size 0.05-0.1μm

2. Select based on processing scale
• Small (<500 m³/d): Integrated MBR unit with hollow fiber membranes
• Medium (500-5000 m³/d): Both flat sheet and hollow fiber membranes are suitable
• Large (>5000 m³/d): flat-sheet membranes dominate

III. Membrane Flux Design

1. Flux Selection
• Domestic wastewater: Flat membrane 15-25 L/(m²·h), Hollow fiber membrane 10-20 L/(m²·h)
• Industrial Wastewater: Flat Sheet Membrane 10-20 L/(m²·h), Hollow Fiber Membrane 8-15 L/(m²·h)

2. Membrane Area Calculation
Formula: A = Q / (J × K), including 10-20% buffer

IV. System Configuration

1. Membrane Tank Design
• Effective volume: Determined by membrane module dimensions and installation method
• Water depth: 2.5-4.0m
• Aspect Ratio: 1.5-3:1

2. Aeration system
• Function: Supplies oxygen for aerobic microorganisms and flushes the membrane surface
• Air-to-water ratio: 15-25:1

V. Conclusion

Selecting the right MBR membrane module is critical to system success. Shandong Zhongnan Environmental Protection Equipment Co., Ltd. provides professional MBR system design and configuration services for our clients.