Abstract: A trough lining assembly is placed in a series of troughs at a biomass processing facility. The trough lining assembly includes a waterproof liner that lies against the sides of a trough, an aerator, and a retention mechanism that retains the aerator at the bottom of the trough. The aerator provides continuous aeration of biomass present in the trough by releasing aerating gas into the biomass along the length of the trough. The continuous aeration also churns the biomass, exposing more of it to the aerating gas and to sunlight. The trough lining assembly improves the efficiency of algae production by stimulating photosynthesis and consumption of carbon dioxide. The trough lining assembly has low production, transportation, installation, and maintenance costs.