This study probed the effect of water potential (Ψ) on anaerobic methane production and a microbial consortium. The Ψ level investigated digester (n = 20) was in range from −0.10 to −2.09 MPa with mean value −1.23 MPa, significantly correlated SCOD, TKN, NH4+-N, alkalinity, salinity (SPS), NH4+, Na+, K+, Cl−, NO3−, PO43− (p < 0.001). maximum rate (Rm) Control (−0.40 MPa) 8.11 mL day−1 decrea...