Ok, I think there needs to be some additional information added to this to be useful.
First, it needs to give much greater emphasis to the importance of carbon addition to produce good compost (and also to disinfect adequately the dangerous pathogens present in the sewage sludge). Generally speaking you need twice as much carbon-rich material as sludge, which can be difficult in a situation where carbon rich material is expensive.
Second, there is no mention of bioaerosols, which are a significant health hazard, particularly in confined spaces.
Third, it may need to be said about safety issues with the use of composted sludge - generally speaking it is not a good idea to spread onto crops you are actually going to eat (eg salad crops etc). Usually you'd be wanting to spread long before you're planning to sow, wherever possible.
I'd say that composting sewage is a viable option, but you really have to know what you are doing (particularly if the sludge gets wet at any time) otherwise you are just providing a fantastic incubator for the pathogens.