Abstract
This chapter deals with fundamental research as well as full-scale experience of power ultrasound application to biological wastewater and biomass treatment processes. Power ultrasound’s first application to wastewater treatment plants targeted the intensification of anaerobic sludge digestion to produce more biogas/methane as energy carrier and less solid residuals for disposal. Now power ultrasound systems have also been implemented for farmland biogas plants with the same goal of intensifying the anaerobic degradation of plant biomass for energy recovery. Recent applications of ultrasound to aerobic biological wastewater treatment are reported and include improved nitrogen removal, reducing excess sludge, and combating filamentous microorganisms.
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