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<br />TABLE 2 Continued <br /> <br />ZEEl:}O <br /> <br />S1goif'icanoe of Common Impuritie. Affecting Water for Do....tic & Indu.trial Use <br /> <br />- <br /> alEllICAL CLASS OF DIFFICULTY CAUSED BY !rS UN!r PROCESS OR COMMON MEAIlS <br />- NAIll l'lDlIIJLAE SOLIDS PRESENCI!: OF REI6JVAL SPECT IT, REMAIU\S <br />Oil Suspended I Il8rmf'ul to boiler opera- Coagulation and filtration. UBUll]Jy dUB to contamination by <br /> ar tiOD. Cannot be Filtration through cloth- trade waetes or oil bearing <br /> l!DmIa1i'iad tolerated in mBn;y grease extractors. condensate . Frequently vo-q <br /> 1ndustria1 processes. troublesome . <br /> Imparts te.te and <br /> odor to water supplies - <br />Sodium Bicarbonate NaBCO) Diasolved All eodium salt. li.ted Dirl1l1etion. Sodium .alt. are found ill <br /> except NaCl impart Cation - anion exchange. practically all water supplies. <br />Sod lum Carbonate N";zC03 1:1osol ved allaUilIi ty to boiler Dilution. All are very soluble and oannot <br /> water. Cause foaJUing ill be removed by ohemical <br />Sodium a,drox1da RAOII Dis80lved boilers and requires p:ecipitation. The concentrati <br /> ucessive blow down. of scdium chloride is ueuall)" <br />Sodium Chlorid. !faCl Dissolved Mey impart s.lty ta.te. referred to a. salinity. <br /> Sodium .slt. ...y have <br /> deleterious effect on <br /> peepl. .i th certein <br /> heart ai1l119nts. <br /> All 2 <br />Toxic Constituenta I (lleslrable Limits):;,.' <br /> Dissolved i I Require special treatment Industrisl wastes should be <br />Lead Ph i 0.1 ppll facHiti.s. treated at the sources end not <br />Arsenic As I 0.05 ppl! be discharged indiscriminately <br />Cyanide (2l ! 0.1 ppm to surface waters. <br />Zinc Zn ( 15 ppl! <br />Copper i Q:I ~ 3.0 ppl! <br /> C <br /> <br />on <br /> <br />Phenols <br />Selenium <br />Chromium (Hex.) <br />Fluoride <br />Acids <br /> <br />fM1iI <br />Se <br />Cr <br />F <br /> <br />.001 ppm <br />.05 ppll <br />.05 ppm <br />1.5 ppm <br />Tarlc wastas destroy <br />aquatic life am create <br />special problema ill water <br />tra.tment plants. <br /> <br />J.J Data taken ill pert from Water llandbook, by W. H. and L. D. Betz. <br />2...l Taken 1npart !'rom PIlbllc IIeslth Servi"" Drinldng Water Standard. (1946) <br /> <br />5-26 <br />