No. By desludging you will also lose VS. The best is to find an alternative source of VS (preferably from other types of waste) and blend it with food waste. It is better known as Codigestion.

Dear Fatihah Suja

You can check pre-treatement processes: thermal, chemical, microwave, etc. to break long organic chains into smaller pieces easier to degrade, meaning an increase of VS/TS. An mentioned before, modifying the feeding mix is an alternative (co-digestion).

Thank you very much to Mr Akshay, Mr Sandor and Mr Angel for your kind suggestions.

Fatihah Suja when you are talking about TS and VS improvements in the anaerobic digestion or in other words i can sum it up as What can you do to speed up anaerobic digestion and this is one and the same thing and we can surely get it by mixing Because mixing liquid manures with drier feedstock materials can raise the TS content of the digester feedstock, farmers must keep adequate moisture in the feedstock to keep anaerobic activity going, as well as evaluate the type of anaerobic digester they're using and how much TS it can tolerate.

Fatihah Suja one more link i am sharing here with which will answer your query about Total Solids and Volatile solids and the pdf file is self explanatory as this shows increasing anaerobic digestion performance with codigestion

https://www.epa.gov/sites/default/files/2014-12/documents/codigestion.pdf

Akshay, agreed will you.