当前位置：
X-MOL 学术
›
J. Environ. Manag.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
A novel insight on the intensification mechanism of sludge dewaterability by ionic liquids
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2023-01-17 , DOI: 10.1016/j.jenvman.2023.117291 Changtao Chen 1 , Tao Zhang 1 , Li Lv 1 , Yanxiao Chen 1 , Wenxiang Tang 1 , Shengwei Tang 1
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2023-01-17 , DOI: 10.1016/j.jenvman.2023.117291 Changtao Chen 1 , Tao Zhang 1 , Li Lv 1 , Yanxiao Chen 1 , Wenxiang Tang 1 , Shengwei Tang 1
Affiliation
|
The huge output of sewage sludge has caused a remarkable environmental burden. Sludge dewatering is considered as an important way to reduce the sludge volume. Five imidazole-based ionic liquids were used to improve the dewaterability of sewage sludge. 1-ethyl-3-methylimidazolium dihydrogen phosphate ([Emim][HPO]) was screened out as a potential conditioner of sludge due to its excellent dewatering performance and reusability. The solid content of sludge filter cake after treatment with [Emim][HPO] was about 10% higher than that of sludge treated by cationic polyacrylamides (CPAM). The intensification mechanism of ionic liquids to the improvement of sludge dewatering performance was studied. The presence of acidic ionic liquids [Emim][HPO] resulted the increase of zeta potential from −14.57 ± 0.81 mV to −5.60 ± 0.30 mV and led to the protonation of biopolymers. Acidic ionic liquids [Emim][HPO] inactivated the microorganism and led to a porous and unconsolidated structure of the solid sludge particles. All these effects were conducive to destroy the microstructure of sludge and release water. However, [Emim]Cl, [Bmim][OTf] and [Hmim][OTf] showed little effect on the protonation of ionizable functional groups at near-neutral environment. The dissolution of biopolymer decreased the zeta potential and strengthened the electrostatic repulsion. So, they showed weaker intensification effects than CPAM.
中文翻译：
离子液体强化污泥脱水机理的新见解
污水污泥的大量产生，造成了巨大的环境负担。污泥脱水被认为是减少污泥体积的重要途径。使用五种咪唑基离子液体来提高污水污泥的脱水性。 1-乙基-3-甲基咪唑磷酸二氢盐([Emim][HPO])因其优异的脱水性能和可重复利用性而被筛选出作为潜在的污泥调理剂。 [Emim][HPO]处理后的污泥滤饼固含量比阳离子聚丙烯酰胺（CPAM）处理的污泥高10%左右。研究了离子液体强化污泥脱水性能的机理。酸性离子液体 [Emim][HPO] 的存在导致 zeta 电位从 -14.57 ± 0.81 mV 增加到 -5.60 ± 0.30 mV，并导致生物聚合物质子化。酸性离子液体[Emim][HPO]使微生物失活，并导致固体污泥颗粒形成多孔且松散的结构。这些作用都有利于破坏污泥的微观结构并释放水分。然而，[Emim]Cl、[Bmim][OTf]和[Hmim][OTf]在近中性环境下对可电离官能团的质子化几乎没有影响。生物聚合物的溶解降低了zeta电位并增强了静电斥力。因此，它们表现出比 CPAM 更弱的强化效果。
更新日期：2023-01-17
中文翻译：
离子液体强化污泥脱水机理的新见解
污水污泥的大量产生，造成了巨大的环境负担。污泥脱水被认为是减少污泥体积的重要途径。使用五种咪唑基离子液体来提高污水污泥的脱水性。 1-乙基-3-甲基咪唑磷酸二氢盐([Emim][HPO])因其优异的脱水性能和可重复利用性而被筛选出作为潜在的污泥调理剂。 [Emim][HPO]处理后的污泥滤饼固含量比阳离子聚丙烯酰胺（CPAM）处理的污泥高10%左右。研究了离子液体强化污泥脱水性能的机理。酸性离子液体 [Emim][HPO] 的存在导致 zeta 电位从 -14.57 ± 0.81 mV 增加到 -5.60 ± 0.30 mV，并导致生物聚合物质子化。酸性离子液体[Emim][HPO]使微生物失活，并导致固体污泥颗粒形成多孔且松散的结构。这些作用都有利于破坏污泥的微观结构并释放水分。然而，[Emim]Cl、[Bmim][OTf]和[Hmim][OTf]在近中性环境下对可电离官能团的质子化几乎没有影响。生物聚合物的溶解降低了zeta电位并增强了静电斥力。因此，它们表现出比 CPAM 更弱的强化效果。
京公网安备 11010802027423号