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Autor(en): 
  • Ellen H. Richards
  • Laboratory Notes on Industrial Water Analysis, A Survey Course for Engineers 
     

    (Buch)
    Dieser Artikel gilt, aufgrund seiner Grösse, beim Versand als 2 Artikel!


    Übersicht
     
    Lieferstatus:   i.d.R. innert 5-10 Tagen versandfertig
    Veröffentlichung:  2007  
    Genre:  Naturwissensch., Medizin, Technik 
    ISBN:  9781408608449 
    EAN-Code: 
    9781408608449 
    Verlag:  Style Press 
    Einband:  Kartoniert  
    Sprache:  English  
    Dimensionen:  H 216 mm / B 140 mm / D 4 mm 
    Gewicht:  114 gr 
    Seiten:  80 
    Zus. Info:  Paperback 
    Bewertung: Titel bewerten / Meinung schreiben
    Inhalt:
    LABORATORY NOTES ON INDUSTRIAL WATER. -- 1908 - TABLE OF CONTENTS . LABORATORY NOTES ON INDUSTRIAL WATER ANALYSIS. PART I. INTRODUCTION. WATER is needed for many uses, the quality desired varying with the needs of the industry. The quality of water found depends upon the geological formations over which it flows or through which it percolates, and upon the previous use which man has made of it. Because of the growing scarcity of the supply, the increasing use per capita, the congestion of popula- tion and the occupation of even the desert and mountain slope, the securing of either safe potable water or water suited to manufacturing purposes becomes more and more difficult, and there is demanded a closer study of the countrys resources and of waters suited to the different uses. Restrictions will undoubtedly be adopted in the near future preventing not only sheer waste and pollution, but assigning various supplies to the most suitable uses. In other words, certain sources of water supply must be saved for the most important needs, and certain other sources must be so treated as to make them usable. Water unsatisfactory for one purpose may be or may be made quite satisfactory for another. The present generation of engineers may not be confronted with these problems, but the students now in training will certainly meet them, and should go to them untrammeled by the practice of the past. Leaving aside potable water, there is a demand for water for steam, for dyeing and textile manufacturing, for brewing, for chemical processes, etc. While each industry has its own peculiar requirements to be determined by the expert chemist, yet the engineer, in deciding upon recommendations, is oftenrequired to estimate the value of water for general purposes. It is of great service to him if he is able to reject at once, to classify as good, or to put into the doubtful category the samples he is examining. If this can be done in the field or in the office, so much the better. The one essential point is that the engineer should recognize both his own limitations and those of the method he employs. A trained and experienced chemist may see more meaning in a given reaction than the ordinary observer. A given test may reveal only a part of the truth, or, in unusual circumstances, it may be misleading. But with all these risks of imperfect work, there are many occasions when a little knowledge is a wholly valuable possession, .so that it is worth while for the student to spend thirty hours on a series of experiments which will indicate methods of attack and may save weeks in the future. Water taken from the deep ground is a sort of residual mother liquor derived from years of time and miles of travel. Surface waters are usually mixed with more or less ground water. The evaporation of water for steam involves a concentration of whatever the feed water holds in suspension or solution, leav- ing in the boiler a thick mud or a coating of more or less stony scale. This is a detriment to the efficiency of the boiler as an evaporator and to its strength as well. It follows, therefore, LABORATORY NOTES 3 that s good water for steam production should be fairly free from suspended clay and earth, from silica, and from easily precipitated iron compounds, from calcium and magnesium bicarbonates, which are precipitated on boiling, and from carbonates and sulphates, which are left as a residue onevaporation. The more friable substances may be removed to a great extent by frequent blowing off. This involves some waste of power, and involves much inconvenience...
      
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