Influence and Mechanism of Solid-Phase Particle Factors on Oil-Solid Separation of Oily Sludge Treated by Flotation Method.

The solid phase composition in oily sludge (OS) is a key factor affecting the oil-solid separation of OS. In this paper, the effects and mechanisms of solid-phase particle factors on the oil content of residue phase were investigated in order to improve the oil-solid separation efficiency. Flotation experiments were carried out on single-size sand and mixed-size sand OS consisting of three particle sizes at room temperature without adding flotation reagents.

A novel multi-factor & multi-scale method for PM concentration forecasting.

In the era of big data, a variety of factors (particularly meteorological factors) have been applied to PM concentration prediction, revealing a clear discrepancy in timescale. To capture the complicated multi-scale relationship with PM-related factors, a novel multi-factor & multi-scale method is proposed for PM forecasting. Three major steps are taken: (1) multi-factor analysis, to select predictive factors via statistical tests; (2) multi-scale analysis, to extract scale-aligned components via multivariate empirical mode decomposition; and (3) PM prediction, including individual prediction at each timescale and ensemble prediction across different timescales.