A system and a process for the production of ethanol and related products from lignocellulosic biomasses (second generation—2G-ethanol), particularly from sugarcane bagasse and straw is provided, however not limited thereto, integrated with conventional processes for the production of ethanol (first generation—1G-ethanol) such as, for example, from sugarcane juice and/or molasses (either in sugar and ethanol plants or in autonomous distilleries), corn, grain, wheat, sugary sorghum, white beetroot, among others, including the recovery/reuse of streams and effluents. More specifically, an integrated process for the production of ethanol and related products where the process warrants increased efficiency particularly in the use of the raw material, steam, electric power and treated water is provided.