Reuse waste water from dialysis

I was wondering whether anyone has come across any projects in the UK that aims to reuse the water used in haemodialysis for other purposes, such as grey water for irrigating hospital gardens/green spaces? I have found the 'Recycling Waste Water from Hemodialysis' in the AJKD that finds nanofiltration of waste water can remove excess minerals is cheaper than desalination of sea water for all methods aside from reverse osmosis. Or any other strategies? I thought with NHS Future's Action Fund support it could make a nice project for a renal unit.