Overview
The KD Disc Membrane Diffuser is a critical component in activated sludge and biofilm wastewater treatment systems. It consists of a circular disc with a flexible membrane that generates fine bubbles when air is supplied. This design maximizes oxygen transfer efficiency (OTE) while minimizing energy consumption. Developed for durability in harsh environments, it is commonly installed in large arrays at the bottom of aeration tanks. Its modular design allows for easy replacement and scalability, making it a preferred choice for both new installations and retrofits.
Structure and Working Principle
The diffuser comprises three main parts: a rigid plastic base plate, an elastic membrane with laser-drilled micro-pores, and a stainless-steel clamping ring. Compressed air flows through the base plate, causing the membrane to expand and release fine bubbles (2–3 mm diameter). The micro-pores close when air supply stops, preventing backflow and clogging. This dynamic operation ensures consistent performance even under variable load conditions. The disc shape (typically 200–300 mm diameter) optimizes floor coverage and mixing dynamics.
Key Features
1. **High Oxygen Transfer Efficiency (OTE)**: Achieves 25–35% OTE due to fine bubble generation, reducing blower energy costs by 20–30% compared to coarse bubble systems. 2. **Anti-Clogging Design**: Self-cleaning membrane pores resist fouling from suspended solids. EPDM membranes offer additional resistance to chemicals like hydrogen sulfide. 3. **Modularity**: Standardized sizes (e.g., 9" or 12" discs) allow flexible tank layouts. Some models include quick-release fittings for maintenance.
Application Areas
Primary applications include municipal sewage plants (extended aeration, SBR reactors) and industrial wastewater treatment (food processing, pharmaceuticals, petrochemicals). In aquaculture, these diffusers maintain dissolved oxygen in high-density fish/shrimp ponds. They are also used in MBR (Membrane Bioreactor) systems where stable aeration is critical for membrane scouring.
Maintenance and Precautions
Routine inspection should check for membrane tears, calcium carbonate scaling, or biofilm accumulation. Cleaning involves soaking in citric acid (for scaling) or high-pressure water jets. Avoid using silicone-based lubricants during installation, as they attract dirt. For industrial wastewater with oils, specify silicone membranes instead of EPDM. Always follow manufacturer guidelines for air flow rates (typically 2–5 Nm³/h per disc) to prevent membrane overexpansion.
B2B Procurement Guide
When sourcing KD Disc Membrane Diffusers, verify certifications like ISO 9001 and NSF/ANSI 61 for drinking water compliance. Key suppliers include Jiangsu YLD Water Processing Equipment and Qingdao Spring Membrane Technology. Bulk orders (100+ units) often qualify for 10–15% discounts. Lead times vary from 2–6 weeks depending on customization (e.g., special membrane compounds). Request performance warranties (commonly 5 years for membranes).
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