Influence of newly synthesized imidazolium ionic liquids on activated sludge process

Abstract

This study investigates the infl uence of four imidazolium ionic liquids (ILs) present in wastewater on the activated sludge process. In addition, experiments with inactivated sludge to assess the capacity of this sorbent to remove ILs from the wastewater were conducted. It occurred that the presence of ionic liquids in wastewater reduces biomass growth and size of the sludge fl ocs. The strongest effect has been found for IL 6 (1-hexyl-2H-3-methyl-4,5-dimethylimidazolium iodide) with the longest alkyl chain length. Also, the degree of ILs removal increases with the alkyl chain length and decreases with the increase of initial concentration of ILs in wastewater. IL 6 reaches the highest degree of ILs removal from wastewater but inhibits the biomass growth and growth of sludge fl ocs in a greater extent than other tested compounds. Moreover, it was confi rmed that newly synthesized ionic liquids can be adsorbed onto inactivated sludge. IL 6 could be adsorbed in a higher degree than other ionic liquids. This adsorption was described by Langmuir isotherm, whereas adsorption of other ionic liquids was described by Freundlich isotherm.Unauthenticated Download Date | 5/12/18 6:36 AM

Effect of Organic Solvents on Microalgae Growth, Metabolism and Industrial Bioproduct Extraction: A Review

“…Traditional solvents and ILs were reported to inhibit activity of microorganisms involved in wastewater treatment processes [ 36 , 37 , 38 ]. The presence of organic solvents in effluents can also affect microalgal cultivation and production of valuable compounds.…”