Particle separation technology is of great importance for recycling and wastewater treatment. The Particle Separation Group has recently developed a pneumatic column separator and a magnetic solid flocculant. The former separates particles depending on their density and is applicable to the separation of waste metals, plastics and glasses from various industrial and municipal wastes. The latter can flocculate suspended solids in wastewater without adding inorganic or organic flocculants. Magnetic force promotes the settling of floccules. The solid flocculant is recovered by re-dispersing the floccules through pH control and can be used repeatedly.