... .less maintenace 4.volume:50-10000m3 The semi-spherical biogas storage tank of double membrane It adopts the special biogas membrane material ... .Content:The outer and inner membraneThe safety of the biogas storage tankThe biogas pressure control deviceThe filling degree monitorUse waste to ... ,600,700,800,900,1000,1200,2000,2500,3000 methane storage tank