My personal view on the best ...

My personal view on the best option for decentralised wastewater treatment is to provide a shallow sewerage system preferably using gravity flow to a packaged modular treatment plant providing primary settlement and secondary membrane filtration, or biological treatment. The effluent from the treatment plant is nutrient rich and can be used for direct irrigation of agricultural crops, public and private gardens. The small fraction of demand requiring potable treatment can then be provided as point of entry treatment in individual homes and communal properties. This system will be much lower cost than treating the whole recycled supply to drinking water standards. I'm particularly interested in promoting this solution because it will require a higher level of distributed monitoring and this will be provided by sensors and actuators connected via IOT (Internet of Things) technologies.