By William C. Lauer, Michael G. Barsotti, David K. Hardy
This pocket box consultant explains dry, liquid, and gasoline chemical feed structures, calibrations, and dealing with and garage specifications for numerous varieties of chemical compounds utilized in water remedy.
Handy feed calculators for fuel, liquid, and dry chemical substances are integrated
Read Online or Download Chemical Feed Field Guide for Treatment Plant Operators PDF
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Extra info for Chemical Feed Field Guide for Treatment Plant Operators
Example text
While a few proprietary chlorine dioxide feed systems exist, most systems used in water treatment plants combine chlorine gas (some use liquid sodium hypochlorite) with sodium chlorite (either solid or liquid). A chlorine dioxide solution is then fed at the point of application. Although chlorine dioxide feed systems are often a hybrid of gas and liquid (or solid), this discussion is included in the gas feed section of this book because the chlorine gas is commonly the controlling factor in this system.
5th ed. Copyright © 1999 McGraw-Hill. Reproduced with permission of The McGraw-Hill Companies. indb 37 Ozone system 12/23/2008 3:21:33 PM 38 Chemical Feed Field Guide CHLORINATOR 12–15 in. Hg VACUUM Cl2 – VACUUM LINE FLOWMETER NaClO2 FILLING PORT VENT SIGHT GLASS Cl2 – NaClO2 REACTION ZONE ABSORPTION AND MIXING IN SOLUTION LINE INJECTOR SAMPLE LINE TO ANALYZER SODIUM CHLORITE INJECTOR PUMP ClO2 Figure 3-11 solution Chlorine dioxide generation system: Chlorine gas/chlorite chemical analyzers measure the chlorine dioxide concentration from the generator and the batch tank, so the correct dosage matches the water flow.
Gases are not often conveyed to the point of application by gravity. Where this is practiced, the gas is first dissolved in water to create a solution. This method is not common because dosage control of the solution is difficult. Once the chemical is measured (metered) to prepare the proper strength solution, a motive pump can be used to move it to the point of application. Motive pumps may be metering pumps but not always. Simple centrifugal pumps (or other types) can be used to provide satisfactory pressure and flow to deliver the solution to the application point.