文摘
To alleviate the increasingly serious water pollution, industrial wastewater is expected to be treated by coal gasification. In this paper, the usability of wastewater in the coal water slurry (CWS) was evaluated. The influences of common components in industrial wastewater, small oxygen-containing organic molecules, on the rheology of the CWS were researched. The viscosity and yield stress of the CWS were found to increase with the presence of small organic molecules. The microstructures and mechanisms of slurries were characterized using confocal laser scanning microscopy (CLSM), Fourier transform infrared spectroscopy (FTIR), and contact angle measurement. In the CWS, the hydrophobic surface of the coal particle was found to absorb small oxygen-containing organic molecules and turn hydrophilic. It resulted in thicker hydration layers and less amount of free water. In addition, dispersants were difficult to absorb at the hydrophilic surface, weakening the steric and electrostatic repulsions between particles. Thereby, industrial wastewater (containing small oxygen-containing organic molecules) has negative impacts on the CWS preparation. Further steps are expected to be researched to weaken and eliminate these negative impacts, to improve the treatment technology of industrial wastewater.
