Raw water such as polluted ground water can be recovered to clean water through the following processes. Firstly, oxidizing agent is added to raw water to disinfect bacteria, and then after suspended solid is removed from the water, ultraviolet rays are irradiated on the water so that organic chlorine...http://www.google.ca/patents/US5234606?utm_source=gb-gplus-sharePatent US5234606 - Method and system for recovering wastewater
