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In an aqueous NaCl solution near the surface of an aluminum sample, a single, laser-generated bubble is created. The corrosion current between the sample and an identical aluminum electrode immersed in the same solution is determined by high-speed chronoamperometry. By the corrosion current from the repassivation, it is possible to determine the cavitation damage in the nanometer thin passive layer of the aluminum surface. The bubble at intermediate stand-offs was not harmful, and at long standoff distances, it was only noticeable during the second explosion, which also occurs at the solid surface, and it was not damaging during the second crack.
Source link: https://europepmc.org/article/MED/36566520
Dissolved Air Flotation devices are designed to remove oil and grease, as well as total suspended solids in wastewater treatment. The most important part of a properly operating DAF unit is a generated bubble size, and complex operational controls associated with these components vary, and the most important part of an effectively operating DAF unit is a controlled bubble size. The evaluation of the proposed system's TSS and O&G removal efficiency was carried out using various initial configurations of the injector, four synthetic wastewater solutions, and poly aluminum chloride as a flocculant to establish the potential of this system for the poultry processing wastewater treatment. TSS removal results were above 60% in the presence of a high number of suspended particles and 80 percent at a lower TSS concentration.
Source link: https://europepmc.org/article/MED/36508608
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