The co-slurrying technology of coal and organic wastewater, which achieves the simultaneous disposal and utilization of wastewater, has attracted extensive attention in recent years. The emission of coal gasification wastewater causes serious environmental hazards, because of its large amount, high organic content, and high toxicity. In the present study, two types of wastewater, namely, gasifier wastewater (GW) and wastewater from a secondary sedimentation tank (SW), were used to prepare coal water slurry (CWS), which was labeled as coal–GW–slurry (CGS) and coal–SW–slurry (CSS), respectively, with coal–deionized water–slurry (CDS) as a reference. The surface property of coal and the dispersing mechanism were characterized using zeta potential and contact angle analyses. Results showed that the fixed viscosity loading decreased with the addition of the two types of wastewater, and the decrease was more considerable with GW. All the slurries exhibited pseudo-plastic behavior and thixotropy, with the following order: CGS > CSS > CDS. Wastewater, particularly GW, strengthened the stability of CWS. The influences of ammonium and volatile phenols on slurry viscosity were also investigated. The effect of ammonium was related to the pH value of the solution. The effect of volatile phenols on the range of wastewater organic content was limited. The stability of CWS was obtained by combining the result of ammonium with organic matter. Ammonium affected the surface charge of coal particles and changed the electrostatic repulsion between coal particles. The amphiphilic organic molecules enhanced the hydrophilicity of coal, which weakened the hydrophobic interaction between particles and thickened the hydration layer. Consequently, the agglomeration of coal particles was weakened.

中文翻译：

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煤-煤气化废水-泥浆的浆化特性及机理

煤与有机废水的共制浆技术实现了废水的同时处理和利用，近年来引起了广泛的关注。煤气化废水的排放量大，有机物含量高，毒性高，因此对环境造成严重危害。在本研究中，使用了两种类型的废水，即气化器废水（GW）和来自二级沉淀池（SW）的废水来制备水煤浆（CWS），该水煤浆被标记为煤– GW –煤浆（CGS）。 ）和煤西南煤浆（CSS），分别以煤去离子水煤浆（CDS）为参考。利用ζ电势和接触角分析对煤的表面性质和分散机理进行了表征。结果表明，固定粘度负荷随两种废水的加入而降低，而GW的降低幅度更大。所有浆料均表现出假塑性行为和触变性，其顺序为：CGS> CSS> CDS。废水，特别是GW，增强了CWS的稳定性。还研究了铵和挥发性酚对浆料粘度的影响。铵的作用与溶液的pH值有关。挥发性酚对废水有机物含量范围的影响是有限的。通过将铵的结果与有机物相结合，获得了水煤浆的稳定性。铵会影响煤颗粒的表面电荷，并改变煤颗粒之间的静电排斥力。两亲性有机分子增强了煤的亲水性，从而弱化了颗粒之间的疏水相互作用并增厚了水合层。因此，煤颗粒的团聚被减弱。