by inhibiting the methanogenic bacteria either by heat chock of the used sludge or by using specific chemicals like 2 Bromo ehtano sulfunic acid sodium salt.
Increase the efficiency in terms of what whether the yield or production rate?
Inoculum pretratment strategies (Pretreatment of the seed source), Post-pretreatment like bioaugmentation also helpful to improve the hydrogen prodution.
Use of new approaches, such as Eco-Biotechnologies for the enrichment of suitable Microbial Mixed Cultures, followed by statistical optimization of process parameters can be a good start. Then optimization in continuous, using in situ removal of target products, combined with cell immobilisation can give a further important contribution.