Abstract
Perilla protein (PP) is abundant in the perilla processing wastewater, and its recovery would result in large productive and financial advantages. This work introduces a novel method, surface modified CaCO3 nanoparticle (CCNP) combined with a drainage-enhancing device, to facilitate flotation of PP. Firstly, we reported the in-situ modification of CCNP via the adsorption of mild and biodegradable surfactant, viz. dodecyl dimethyl betaine (BS12), and revealed the modification mechanisms. Interestingly, BS12-CCNP as a solid foam stabilizer increased the foam stability and improved the interfacial adsorption of PP. Secondly, we designed a waved internal component (WIC) to intensify the foam drainage and raise PP enrichment. Eventually, the recovery percentage and enrichment ratio of PP reached 91.7 ± 4.6% and 12.5 ± 0.6, respectively, with 0.7 g/L of BS12-CCNP and WIC. In conclusion, this method contributes to enhancing the separation efficiency of waste PP and provides technological insights into the nanotechnology enabled flotation.
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