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Emerging Technologies Aeration prepared 2012 Ultra-fine Bubble Diffusers Objective: Use of advanced diffuser technology in aerobic biological treatment processes to achieve enhanced energy reduction over fine bubble diffusers. Description: March 2013 Technology Summary State of Development: Emerging. Recent advances in membrane materials have led to ultra-fine bubble diffusers, which generate bubbles with an average diameter between 0.2 and 1.0 mm. The primary appeal of ultra-fine bubble diffusion is improved oxygen transfer efficiency (OTE). Additionally, some composite materials used in the manufacture of ultra-fine bubble diffusers are claimed to be more resistant to fouling, which serves to maintain the OTE and reduce the frequency of cleaning. Concerns about ultra-fine bubble diffusion include slow rise rates and the potential for inadequate mixing. Two proprietary ultra-fine bubble diffuser designs, panel diffusers by Parkson and Aerostrip® diffusers by the Aerostrip Corporation, are discussed below. Messner developed the original ultra- fine bubble diffuser which is marketed in Europe by Trevi Environmental Solutions. Comparison to Established Technologies: Ultra-fine Bubble Diffusers are reported to achieve enhanced energy reduction over fine bubble diffusers. The advantages of panel diffusers include the increased OTE and the even distribution of aeration. Disadvantages can include a higher capital cost, a higher head loss across the diffuser, increased air filtration requirements, and a tendency to tear when over-pressurized. Panel diffusers by Parkson are membrane type diffusers built onto a rectangular panel. They are designed to cover large areas of the basin floor and lay close to the floor. Panel diffusers are constructed of polyurethane and generate a bubble with a diameter of about one mm. AeroStrip® is a proprietary diffuser design manufactured in Austria by Aquaconsult. The device is a long strip diffuser with a large aspect ratio. According to the manufacturer, it is a homogenous thermoplastic membrane held in place by a stainless steel plate. The AeroStrip® diffuser provides many of the same advantages and disadvantages as panel diffusers; however, it appears to be less prone to tearing. Also, the smaller strips allow tapering of the diffuser placement to match oxygen demand across the basin. AeroStrips may be mounted at floor level or on supports above the floor. Manufacturer’s claims regarding the strip membrane diffuser include: • Energy efficiencies between 10 percent and 20 percent greater than the traditional ceramic and elastomeric membrane diffuser configurations. • Uniform bubble release across the membrane surface. • Bubbles resist coalescing. • Membrane not prone to clogging. • Diffusers are self-cleaning, although Aerostrip panels have been reported to be susceptible to frequent fouling requiring bumping and flexing of the membrane to dislodge. Available Cost Information: Not available. Vendor Name(s): Parkson Corporation – HiOx Panels Telephone: 1-888-PARKSON Fax: 954-974-6182 technology@parkson.com Installation(s): Information not available. 6-16 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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