Maybe you can get an idea from the article: "Techno-economic evaluation of a combined bioprocess for fermentative hydrogen production from food waste" from Wei Han, Jun Fang, Zhixiang Liu, Junhong Tang
Article Techno-economic evaluation of a combined bioprocess for ferm...
At first you must specify the process parameters to find production rate, ratention times and more to be able to calculate for example the volume of tanks, M+R equipment, specify mixing units, determine a volume of hydrogen storage etc. You must also give production capacity of the intended facility. Without knowledge of this information you cannot evaluate investment costs, operational costs etc.