separation Technology: general issues 7 adsorption 6 History of engineering & technology 5 nanoparticles 4 wastewater treatment 4 Research & information: general 3 flotation 3 precipitation 3 purification 3 solvent extraction 3 Biology, life sciences 2 MOF 2 activated carbon 2 bauxite residue 2 catalysis 2 characterization 2 chitosan 2 circular economy 2 convolutional neural network 2 drug delivery 2 electrodeposition 2 energy 2 eutrophication 2 fermentation 2 graphene 2 hydrometallurgy 2 imaging 2 immobilization 2 indium 2