Now for some reality. High capital cost, high maintenance. Problems, urine, diarrhoea, dust storms, clouds, high humidity etc. Number of users versus numbers of toilets. Sewerage also includes washing water, showers, bath, hand basin and, kitchen sink.
Question would it be simpler to bring in normal toilet blocks and a mobile sewerage treatment plant, something along the lines of a methane powered digester that could actually deal with all sewerage requirements not just dried out poop. Answer, well duh. Fucking stupid is thinking sewerage is just faeces and not all of the rest. The biggest problem with sewerage is not smell, it is human disease, especially water borne diseases and those can come not only from faeces but urine and wash water as well as nasal mucus discharges, open sores and not to forget medical wastes.
Designing a better toilet to be blunt is really, really stupid. Designing better sewerage treatment systems incorporating portability, rapidity of set-up, ease of maintenance and energy requirements is the only sensible way to go because their is a lot more to human waste than just faeces.