What are the biggest barriers to residential sewage being recycled as reusable (if not quite potable) water?
asked 11 February 2016 asked by Rupert_Whiting (2700 points)
I find the biggest barriers are psychological rather than technical. The technology is there, but the idea of recycling water from waste to reuse is repulsive to most. Up to now, the consumer has been spoiled with tap on demand. There is also a matter of cost and complexity. Managing multiple streams of water is more complex and can lead to errors, as it is in the case of separate sewers. If one ingest grey water, there is more risk involved.
You are so right. The biggest issues are mental. Many houses don't even use their general plumbing for potable water anymore because they use bottled water for that. There's a growing need to recycle water and I think some of the legislation (I live in BC, it is pretty brutal up here) is very out of date and irrationally conservative about what can and cannot be used as irrigation water or flowed back into the house to flush toilets etc.