If your source is a free ... Published November 25, 2017 13:54 by Rafael Gay-de-Montella MSc PEng, Water Wastewater Treatment Expert, Oil-Gas, Tailings, Boilers, ZLD; Evaporators, Sludge If your source is a free running stream, and you live in a sunny place, you could install a solar evaporator, simple and effective for small flows.