AI Article Synopsis
- The massive production of sewage sludge poses significant environmental challenges, prompting the need for effective dewatering methods.
- Five types of imidazole-based ionic liquids were tested, with [Emim][HPO] being identified as the most promising due to its superior dewatering capabilities and ability to be reused.
- The study found that [Emim][HPO] improved the zeta potential and altered the sludge’s microstructure, enhancing water release more effectively than other ionic liquids and traditional cationic polyacrylamides.
Article Abstract
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.
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| http://dx.doi.org/10.1016/j.jenvman.2023.117291 | DOI Listing |
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