Jar Test Essay

1578 WordsDec 7, 20137 Pages
ANALYTICAL PROCEDURES Jar Testing WTI/CHEMISTRY/LABORATORY ANALYSES/JAR TESTING/LANCASTER/2011 After you have completed this section, you should be able to: • • • • • • • • • • Describe key elements for selecting a jar test sampling site Recognize that jar tests should be designed to mimic plant conditions Identify key parameters to be evaluated in the jar test Recognize value of jar testing for regulatory compliance Recognize the impact of variation in mixer speeds Evaluate jar test results Be aware of other test methods for coagulant optimization Understand the electrical principles of operation of a zeta meter & SCD Recognize potential analytical interferences Recognize critical factors for successful jar test analysis WTI/CHEMISTRY/LABORATORY ANALYSES/JAR TESTING/LANCASTER/2011 Assigned Reading • • • Water Treatment Plant Operation (Vo1 1 6th ed ) p 567-568, 112-118 Water Quality, 4th Edition p 128-130 Website links provided with this chapter (NEMI.gov etc.) WTI/CHEMISTRY/LABORATORY ANALYSES/JAR TESTING/LANCASTER/2011 Jar Tests are Underappreciated Wally did a jar test He'd done them in the past He never really liked them So he did it really fast He did not have a beaker So he used a mason jar He stirred it with a swizzle stick He'd picked up at some bar He got the same useless results That he knew he would…. Like he always told his boss “Them Jar tests are no good!” Where did Wally go wrong????? WTI/CHEMISTRY/LABORATORY ANALYSES/JAR TESTING/LANCASTER/2011 Jar tests are intended to be a carefully controlled small-scale replica of plant operation Wally did a jar test He'd done them in the past He never really liked them So he did it really fast 1 He did not have a beaker 2 So he used a mason jar 3 He stirred it with a swizzle stick He'd picked up at some bar He got the same useless results That he knew he would…. Like he

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