When you say you have to design a system, you realise this can hardly be done at less than a certain minimum price. You cannot cut corners with this kind of thing. And a certain amount of 'over design' is preferred to any amount of 'under designing, and its consequences!
I have found a site which may be of use as it describes what reactions happen and what needs to happen to the waste at each stage.
The diagrams are a little primitive but hopefully adequate.
Why cannot the flows flat the building go to a treatment works, which treat effluent from millions of people, not just 300.
This seems like a very expensive way to deal with the waste. And, it will need to be some distance away and down-wind.......If you get my drift? Is it not feasible to have several large Cesspit's which are emptied very regularly? The 'clients' living in this build or complex need know anything of this. I think they would have more interest in decorating than 'poo'.
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The anaerobic contact process is a type of anaerobic digester. Here a set of reactors are created in series, often with recycling. This recycled material is pumped up into the bottom of the first reactor, an upflow reactor. The upflow anaerobic process is a large reactor which allows the waste to flow up from the bottom and separates the waste into 3 zones. At the very top is the biogas zone where the gas is collected. Bacteria digest waste in the lowest portion of the upflow reactor; the bio-reactor zone. In between these two stages is the clarifier zone where the which exports the stabilised waste [1][2].
A diagram of an anaerobic contact process can be found here.
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