NOVELTY - The trough lining assembly comprises a liner (32), a pressurizable tubular nutrient line (18) that co-operates with the liner to provide a nutrient solution to a biomass in a trough (23) that is lined with the trough lining assembly, a pressurizable tubular aerator (17) that cooperates with the liner to churn the biomass, and a retention mechanism attached to the liner and positioned to retain the aerator and the nutrient line at or near a bottom of the trough. The liner conforms a shape of the trough when the trough lining assembly is laid along the length of the trough.    USE - The trough lining assembly is useful for aerating a biomass (claimed) containing algae while providing nutrients to the biomass to stimulate chemical changes in the biomass, and useful as an aerobic digester for the treatment of wastewater and to stimulate growth of algae, shrimp, fish and other water-based biological products.    ADVANTAGE - The trough lining assembly improves the efficiency of algae production by stimulating photosynthesis and consumption of carbon dioxide, and provides consistent and favorable concentration of nutrients thus promoting the algae growth without restricting biomass flow.    DETAILED DESCRIPTION - The trough lining assembly comprises a liner (32), a pressurizable tubular nutrient line (18) that co-operates with the liner to provide a nutrient solution to a biomass in a trough (23) that is lined with the trough lining assembly, a pressurizable tubular aerator (17) that cooperates with the liner to churn the biomass, and a retention mechanism attached to the liner and positioned to retain the aerator and the nutrient line at or near a bottom of the trough. The liner conforms a shape of the trough when the trough lining assembly is laid along the length of the trough. The trough has v-shape. The nutrient line is a tube line and nonporous line, and comprises emitters spaced longitudinally along the nutrient line. The nutrient solution is released through the emitters. The emitters are slits, and are uniformly spaced. The retention mechanism comprises a retaining strip (35) that is attached to the liner and forms an envelope inside which the aerator and the nutrient line are retained. The retaining strip comprises apertures. The aerator and nutrient line co-operate to provide the nutrient solution to the biomass while churning the biomass, and are disposed between the retaining strip and the liner. The trough lining assembly is flattened and rolled onto a deploying spool. An INDEPENDENT CLAIM is included for a method of aerating a biomass.    DESCRIPTION OF DRAWING(S) - The diagram shows a cross-sectional view of a trough lining assembly.    Aerator (17)    Nutrient line (18)    Trough (23)    Trough sides (24)    Liner (32)    Retaining strip (35)    Tractor paths. (42)