Obviously it will be important to come to agreement of what hits will be presented in the final paper/presentation, but abstract is fine. Just a couple of typos: "of" missing before "methane" in first line, and where you first mention "compound libraries", you need to say libraries of what for the novel reader to understand this. I.e. compound libraries of chemicals that could potentially inhibit methanogens and thus be used to develop mitigation options. Also for the title: is it correct to say you are screening methanogens, or are you screening potential inhibitors for their ability to suppress methanogens? But these are just suggestions for improved understanding, not approval issues, over to you.