The SciencesDollars From SewersModern Purification Techniques Have Advanced to the Point Where Valuable By Products are Obtained from Sewage Treatment Processes. Fertilizer, Gas, Grease, and Processing Water are "Manufactured" from the Liquid Wastes Collected in SewersBy Edward J. Cleary on September 1, 1943AdvertisementABOUT THE AUTHOR(S)Recent Articles by Edward J. ClearyBetter Water for IndustryHighways Alter the WarWood in War Construction