ERA has proposed new standards for water quality. These are different from the present USPHS standards and from AWWA goals. This article presents the figures and gives reasons why these standards were chosen.
In this progress report, an outline is presented of the results of Committee 2225 M's subsequent work on the need for professional standards of water quality as presented at the 1960 Bal Harbor Conference. This progress report also outlines the characteristics of an “Ideal Quality Water.” The qualities are delineated on a level to meet the functional definition stated herein, which is limited by the sensitivity of present test methods and by current medical and sanitary knowledge.
The Philadelphia Water Department, through its water quality and research division and its operations divisions, conducts studies to develop better methods of control of chemical doses, and greater efficiency in the use of chemicals. In previous laboratory, pilot plant, and full‐plant scale tests on coagulation, the laboratory jar stirring test has been used as a control method, and research has been directed to the effectiveness of various coagulants‐alum, ferrous and ferric salts, and sodium aluminate and of numerous coagulant aids. In this continuing work, the use of a zeta potential (ZP) microscope and cell was investigated. Some of the preliminary study results obtained with this equipment are presented, along with a brief discussion of the published findings of other writers and of the purpose and possible future use of ZP.
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