Colin,  Patrick's comments ...

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Colin, 

Patrick's comments and sources are very complete and valuable to find answers to your specific needs. We are manufacturing and installing the following systems in Mexico: http://www.aquatec.sk/en/.  Better check Aquatec's website as it is in English. 

The advantage is that you can reuse every liter of household water in irrigation, we are even treating it to a level of quality that allows for reuse in toilets. The disadvantage is the energy consumption. For the same reason I would not even consider installation an aerobic wastewater treatment and recycling system if the use of the off-grid building is very low. 

Good luck and best regards, Marc