Beneficial utilization of Al/Si/O-rich solid wastes for environment-oriented ceramic membranes.
Beneficial utilization of Al/Si/O-rich solid wastes for environment-oriented ceramic membranes.
复制标题
DOI：
10.1016/j.jhazmat.2020.123427
复制
发表时间：
2020-07
影响因子：
13.6
通讯作者：
Ziyi Wang;Zhe Xu;D. Qiu;Y. Chu;Yuanyuan Tang
中科院分区：
文献类型：
--
作者：
Ziyi Wang;Zhe Xu;D. Qiu;Y. Chu;Yuanyuan Tang
传统的多层陶瓷膜由于膜材料稀少、成本高、烧结温度高而限制了其广泛应用。本研究以典型固体废弃物（粉煤灰、底泥和污泥）为原料，制备了Al-Si-O陶瓷膜。物相分析表明，钙长石为主要晶相，膜的体积密度和孔特性随原料组成的不同而不同，抗折强度为40.82-71.46 MPa，平均孔径为0.23 μm、0.28 μm、0.32 μm和0.84 μm。将其应用于含油污水处理中，当油水乳状液透过通量保持在1200 L/m2·h左右时，四种膜的除油率均达到98%以上。此外，陶瓷膜在苛刻的环境条件下的稳定性被证实，在酸性/碱性介质中被腐蚀后的重量损失率可以忽略不计。此外，即使在六个循环之后也可以实现超过95%的原始通量，这证实了膜的优异的可回收性。以Al-Si-O固体废弃物为基质制备的环保型单层陶瓷膜的成功应用，为典型固体废弃物作为陶瓷原料的资源化利用提供了一种有前景的“废物变资源”策略。
Wide application of traditional multilayer ceramic membrane has been severely restricted by high costs associated with rare membrane materials and high sintering temperature. In this study, typical solid wastes (coal fly ash, river sediment and sewage sludge) were adopted as raw materials to provide an Al-Si-O matrix for single-layer ceramic membranes. Phase identification shows anorthite as major crystalline phase, while bulk density and pore characteristics of the membranes varied with different raw material compositions, with flexural strengths of 40.82–71.46 MPa, and average pore size of 0.23 μm, 0.28 μm, 0.32 μm and 0.84 μm. When the membranes were applied in an oily water treatment, the oil rejection reached >98 % when using any of the four membranes with oil/water emulsion permeate flux remaining at ∼1200 L/m2·h. Furthermore, the stability of ceramic membranes in harsh environmental conditions was confirmed, with negligible weight loss ratios after being corroded in acidic/alkalic media. In addition, more than 95 % of original flux can be achieved even after six cycles, which confirmed the excellent recyclability of the membranes. The successful fabrication and application of the environment-oriented single layer ceramic membranes from the Al-Si-O solid waste matrix provided a promising “waste-to-resource” strategy for beneficial utilization of typical solid wastes as ceramic raw materials.