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Wind power system plays an important role in smoothing wind power fluctuations. In consideration of limited advantage of single energy storing dielectric, the hybrid energy storage system has a good application prospect with its merits complementation. In this paper, firstly the types of power and energy storage are used to establish the hybrid energy storage power system. Considering their characteristics, the energy storage power system model is established, which can combine advantages of different energy storage devices. And then, according to the constraint of charging and discharging power rate of two mediums and capacity contrast constraint, energy storage capacity optimization model is set up aiming to minimize the sum value of running cost and construction cost. At last, the algorithms and solving steps are proposed. The analysis on actual operating data of wind power plant can verify the effective and reasonability of the proposed method.

Membrane-concentrated landfill leachate (MCLL) is a type of recalcitrant wastewater with extremely low biodegradability. Identification of the recalcitrant components and their degradation characteristics is crucial for developing effective treatment strategies. In this work, spectroscopic techniques were integrated with chemometrics and Fourier transform ion cyclotron resonance-mass spectrometry to track the compositional changes of dissolved organic matter (DOM) in MCLL during Cu-Fenton treatment. The degradation of both fluorescent and chromophore components followed pseudo-first-order kinetics during the Cu-Fenton process, with the sequential order of fluorescent DOM (terrestrial humic-like > microbial humic-like) > chromophore DOM (aromatic structure > conjugated unsaturated structure). The degradation characteristics of DOM in MCLL exhibited variations in response to elemental compositions and molecular structure. Nitrogen-containing compounds showed an increase in relative abundance, while sulfur-containing compounds progressively decreased. Lipids, aliphatic/proteins, aromatics, and lignin/carboxylic-rich alicyclic molecule-like structure with a low O/C ratio were effectively removed, resulting in the transformation of DOM from an unsaturated redox state to a saturated oxidation state. This study provides a comprehensive insight into the transformation of DOM in MCLL during the Cu-Fenton process, which demonstrates its potential as a promising technology for refractory wastewater treatment.