Download Chemical Feed Field Guide for Treatment Plant Operators by William C. Lauer, Michael G. Barsotti, David K. Hardy PDF

By William C. Lauer, Michael G. Barsotti, David K. Hardy

This pocket box consultant explains dry, liquid, and fuel chemical feed structures, calibrations, and dealing with and garage specifications for numerous forms of chemical substances utilized in water remedy.

Handy feed calculators for fuel, liquid, and dry chemical substances are integrated

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Extra resources for Chemical Feed Field Guide for Treatment Plant Operators

Example text

In many systems, analyzer accuracy and reliability are questionable. Attentive analyzer maintenance and calibration can relieve this issue. An automated closed-loop system includes both flow pace and analyzer value set-point adjustments. Water treatment chemical feed control strategies commonly employ a combination of these methods. The chemical feeder, for example, is set to deliver the required dosage. As the process flow changes, the feeder is adjusted automatically to match the flow. A sensor may also be in place to measure a particular character of the chemical.

Indb 41 This calculator uses a flow in mgd so gpm must be converted to mgd first (Table 4-1). 67 10,000 2,400,000 2,400 100,000 lb/hr = pounds per hour, lb/day = pounds per day, g/day = grams per day, kg/day = kilograms per day, g/hr = grams per hour. Ozone Feed Calculations Ozone feed is similar to the pure gases (chlorine, sulfur dioxide, anhydrous ammonia, carbon dioxide), but it is complicated by the fact that the feed gas is not 100 percent pure ozone. Also, in ozone contactors, the transfer to the water is not 100 percent efficient.

Simple systems feed the gas directly to the application point and bubble it into the water without any intervening steps. Complex systems use both gases and liquids to produce the chemical, store batches at various strengths, and feed this material into a variable flow of water. Regardless of the degree of complexity, and using the proper procedures, feeding gases can be carried out accurately and safely. indb 38 12/23/2008 3:21:33 PM Chapter 4 Chemical Feed of Gases— Calculations and Examples Liquefied gases under pressure are commonly fed as gases when used in water treatment processes.

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