Chen et al.(2008) reviewed various methods used to counteract ammonia inhibition, including adaptation. Two practical methods were tested successfully: (1) dilution of the reactor contents with water and (2) adjustment of feed stock C/N ratio ( Kayhanian 1999). Physicochemical or biological removal of ammonia from methanogenic sludge is another approach. Physicochemical methods include ammonia stripping ( Abouelenien et al.2010), chemical precipitation with magnesium ammonium phoslate ( Demeestere et al.2001), and selective exchange of ammonium ions by using zeolite or glauconite ( Borja et al.1993; Hansen et al.1999). Biological processes in sequential anaerobic, Aerobic/anoxic, or anaerobic multi- compartment systems include nitrification /denitrification and anaerobic ammonia oxidation (Baloch et al. 2006; Agdag and sponza 2008;Bernet and Beline 2009). Addition of clay (as a mineral supply and for biomass retention ), activated carbon (for sulfide removal and biomass retention ), carbon fiber textiles (for biomass retention ), or FeCl2 (for sulfide removal ) and increasing hydraulic retention time (for biomass retention) are also effective for counteracting ammonia inhibition ( Borja et al.19996; Hansen et al. 1999; Sasaki et al. 2011a). Magnesium and calcium were shown to be somewhat antagonistic to ammonia inhibition ( McCarty and McKinney 1961).