Fig.3

Biomethanation performance of RP cells and RP/CdS hybrid cells under the irradiation of light with different wavelength a 400–500 nm, b 500–600 nm, c 600–700 nm, respectively. The experiments were performed under OD660 = 0.5, 10 mM NaHCO₃, 10 mM L-Cys and 100 lx light intensity