A Review of Twenty-One Years' Experiments Upon the Purification of Sewage at the Lawrence Experiment Station
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...station sewage in three doses one hour apart and allowed to stand two hours before draining. The plan of providing favorable conditions for the deposition of suspended matter was entirely successful and the filter lost open space rapidly. The effluent, however, was never of good quality. During May and June the anaerobic conditions noted with Filters Nos. 173 and 174 became strongly marked, and the filter was discontinued at the end of June. Effluent of Filter No. 104. Parts per 100,000. Contact Filters containing Iron.---Filters Nos. 121, 123, 125, 139 and 165. Metallic iron and oxides of iron have been used in the purification of water and sewage, and many positive statements have been made with regard to their influence, but their action had been studied but little previous to the investigations made at the Lawrence Experiment Station in 1899 and 1900. These experiments, which were reported on pages 469 to 475 and pages 416 to 420, respectively, of the 1899 and 1900 reports, were made to determine whether iron could be successfully employed as a carrier of oxygen and thereby assist the bacterial purification, or whether a chemical purification could be produced which would, in a measure, be a substitute for bacterial processes. Five different contact filters containing iron in one form or another were operated. Filter No. 121, containing 5 feet in depth of a mixture of one-third iron turnings and two-thirds coarse coke, was started March 29, 1899, and Filter No. 123, consisting of 4 feet in depth of iron turnings alone, was started May 4, 1899, the former being operated with septic sewage and the latter with regular station sewage. During the period of seven months in which these fillters were operated nitrification did not become established...
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