南非采购需求：聚合物加药系统、筛网和细筛网、气泡扩散器、MBBR介质、纳米气泡发生器、潜水式搅拌器

I am looking for fine bubble diffusers, preferably in a 12-inch size or a more advanced version that provides enhanced efficiency for wastewater treatment processes, specifically for activated sludge biological nutrient removal (BNR). It's crucial that the diffusers are designed to optimize oxygen transfer and promote effective mixing within the system. Could you provide details on the available models that meet these criteria? Additionally, I'd like to know about the materials used, the installation requirements, and any performance data you can share. If there are any options that showcase innovative technology or increased durability, please highlight those as well. Looking forward to your prompt response with relevant specs and pricing.