Renowned water expert Dr Yoram Oren has been developing nano-filtration membrane separation to purify two of India’s mighty rivers. The Noyyal and the Bhavani have been polluted due to the large scale discharge of toxic effluents from dyeing units along the river shores.
http://articles.timesofindia.indiatimes.com/2013-01-11/coimbatore/36279357_1_water-bodies-water-expert-zero-discharge