Your question is very wide. I guess you want to achieve some kind of sustainability assessment? Combining LCA with LCC and social LCA would do the trick. Then, for each method are numerous questions related to choice of data, ILUC etc. And not to mention how to combine it to an overall assessment.
My question is about selection of potential use , whether it can go for bioethanol or biogas basing on biomass properties, I do not understand how LCA will help ?
OK, I see. Biomass in the form of oil, fat or lipids is feasible for biodiesel production.
For biogas carbon should be easy degradable, eg as sugar, fat and protein. Lignocellulosic material are less suitable. I guess the same counts for ethanol.
Impurities and inhibitors is something to also keep track of but I leave that part to someone else.
It depends on your conversion technology and pre-treatment. You can make ethanol, diesel or gas from biomass. I think you need to revisit your question. Which angle are you coming from ? Do you want to match biomass to a specific technology? Time to look into conversion technologies. Each has somewhat different requirements for biomass. For example a fisher-tropsch based approach is only economical if you have large amounts of biomass supply (~> 1Mt+/year). Biocrude and enzymatic ethanol can get away with less. Local (supply) economics play a critical role in what type of biomass you can match with the type of conversion technology.
In current industry, Biogas digestors are good solutions for increasing organic wastes specially in urban ecosystems. In this regard, I would like to share you the following paper which made to get a comprehensive knowledge:
Article Construction of a Pilot Scale Biogas Digester at the Univers...
Article Design and Fabrication of a Plastic Biogas Digester for the ...
Bioethanol is derived from sugar based product. Therefore, the rawmaterial must have high sugar content If it is selected as a promissing rawmaterial for bioethanol.
Biogas can be produced by a rawmaterial with high C: N ratio. Therefore, the rawmaterial for biogas should have high C: N ratio.
Biodiesel is a type of biofuel which is derived from the triglyceride. Therefore any oil or fat can be promissing rawmaterial for biodiesel. However, the oil with less acid value is benefical.