Gutierrez et al reported that a

The exposure of the entire sewer line to pH 11.5 for 6 h was adequate for complete control of methane production for more than 2 weeks. A 67% decrease in sulfide production occurred in the 2 days following the alkali shock-dosing. The SRB activity recovered gradually over a period of 7 days, while the methanogenic activity took much longer to recover. Recently, a new caustic generation system (Pikaar et al., 2011 and Pikaar 'CHIR-98014' et al., 2013) has been able to continuously produce, in-situ, ca.