Gouttal Khadidja, Benghalem Abderrezak, Mimanne Goussem, Karim Benhabib
University of Sidi Bel Abbes Laboratory of Materials Catalysis, Hai Larbi Ben M'hidi BP89, Sidi Bel Abbes 22000, Algeria E-mail:
Département Génie Chimique - Génie des Procédés, IUT de l'AISNE, 48, rue d'Ostende, 02100 Saint-Quentin, France.
Water Sci Technol. 2018 Sep;78(3-4):534-544. doi: 10.2166/wst.2018.321.
This work is about organic matter removal from Sidi Bel Abbes wastewater plant (Algeria) by coagulation on pillared clays (PILCs) under pH and PZC (point of zero charge), conditions. Two pillared clays, M/Al-PILCs (M = Fe or Mn), were synthesized, characterized, and studied as coagulants. Results showed that Fe/Al-pillared clay exhibits superior efficiency, with 18% higher removal rate than the common coagulants alum (AS) and ferric chloride (FCl), and that sedimentation time has positive effect on turbidity removal, with 95.85% removal rate during 30 min. Moreover PILCs will not cause pH go down too low, which is an advantage for achieving the best overall treatment. The IR and UV bands' reduction reveals the breakdown fragmentation of high molecular weight organic substances into smaller units. The highest total organic carbon (supercritical water oxidation analysis) and chemical oxygen demand adsorption capacities (48.52% and 61.85% respectively) obtained for Fe/Al-PILC can be related to increased basal spacing between adjacent layers, creating favorable adsorption sites in the microporous system. The suggested adsorption mechanism involves strong interactions between pollutants and PILCs leading to PILC-pollutant complex formation.
这项工作是关于在pH值和零电荷点（PZC）条件下，通过在柱撑黏土（PILCs）上进行混凝，从西迪贝勒阿巴斯污水处理厂（阿尔及利亚）去除有机物。合成、表征了两种柱撑黏土，即M/Al-PILCs（M = Fe或Mn），并将其作为混凝剂进行研究。结果表明，铁/铝柱撑黏土表现出更高的效率，去除率比常用混凝剂明矾（AS）和氯化铁（FCl）高18%，并且沉淀时间对浊度去除有积极影响，30分钟内去除率达95.85%。此外，柱撑黏土不会使pH值降得过低，这有利于实现最佳的整体处理效果。红外和紫外波段的降低表明高分子量有机物质分解成了更小的单元。铁/铝柱撑黏土获得的最高总有机碳（超临界水氧化分析）和化学需氧量吸附容量（分别为48.52%和61.85%）可能与相邻层之间基面间距的增加有关，从而在微孔系统中形成了有利的吸附位点。所提出的吸附机制涉及污染物与柱撑黏土之间的强相互作用，导致形成柱撑黏土 - 污染物复合物。
