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<br />" <br /> <br />o <br />C_,' <br />~ <br />c..u <br />N <br />~ <br /> <br />Item <br /> <br />Explanation <br /> <br />TABLE l-A (Cont'd) <br /> <br />., <br /> <br />Coliform bacteria. <br /> <br />Algae, <br /> <br />, <br /> <br />Biological forms other <br />than Coliforms and <br />Algae, <br /> <br />Floating waste solids. <br /> <br />Sludge deposits, <br /> <br />Oil. <br /> <br />Odor (Threshold) <br /> <br />I Expressed as "most probable number" (M.P.N,). <br />I This test is the most delicate and ~pecific <br />, test for pollution by sewage as it shows the <br />I approximate density of a group of bacteria <br />I which are always present in large numbers in <br />sewage, Coliform bacteria are normal inhab- <br />I ite.nts of the intestines of warm-blooded <br />, ani:mals and are discharged in large numbers <br />I in human feces, which oonstitute the princi- <br />, pal source of these bacteria in' sewage. <br />I <br />I PriJnitive plants, one or many-celled, capable <br />. of producing their food by photosynthesis. <br />I Algae are of significance as index to sani- <br />I tary condition of stream, supplementary <br />. source of dissolved oxygen, source of food <br />I for fish, cause of tastes and odors in <br />I drinking water supplies, and as cause of <br />I mechanical difficulty by clogging of units <br />I in treatment plants. <br />r <br />'Aquatic organisms are important in judging <br />I the pollutional conditions in str.:l"ams, The <br />I ecology of =y cOlll1llon organisms is known, <br />~d therefore the presence or absence of <br />these organisms may throw light on past <br />and present pollution. Bottom forms are <br />of particular significance as indices of <br />stream conditions. <br /> <br />I <br />I <br />I <br />I <br />I <br />I Relate to prevalence of objectionable condi- <br />I tions and poor functioning of sewage and <br />I industrial waste treatment plants~ <br />I <br />, Relate to prevalence of objectionable condi- <br />I tions and poor functioning of sewage and <br />I industrial waste treatment plants, Such <br />I deposits exert an oxygen dElllland thus reduc- <br />I ing the dissolved oxygen available for stream <br />I purification. <br />I " <br />I Relates to prevalence of objectionable condi- <br />I tions and poor functioning of industrial <br />I waste treatment plants as well as to careless <br />I operation on oil-using vessels, <br />I <br />I <br /> <br />The point at which, after successive dilutions <br />,with odor free water, the odor can just be detected. <br />5-23 <br />