Assessment of methane enrichment efficacy of pre-disintegrated water hyacinth biomass using sonic wave assisted biosurfactant

•Sonic wave method was attained minimal biomass lysis rate (15.7 %).•Sonic wave coupled Iturin A with alkaline pH method got higher biomass lysis rate.•Higher biomethane noted for sonic wave coupled Iturin A with alkaline pH method.•Sonic wave coupled Iturin A with alkaline pH method attained energy ratio of 1.51.