On-Line THM Analyser July 2012 Global THM-100 Installations 2 - PowerPoint PPT Presentation

On-Line THM Analyser July 2012

Global THM-100 Installations 2 ¡

GLOBAL THM SPECIATION THM"Specia/on:"UK"+"Spain"+"California" 100" 90" 80" BrCl2"(UK)" Br2Cl"(UK)" 70" Br3"(UK)" 60" BrCl2"(US)" %"THM" Br2Cl"(US)" 50" Br3"(US)" BrCl2"(ES)" 40" Br2Cl"(ES)" Br3"(ES)" 30" 20" 10" 0" 0" 10" 20" 30" 40" 50" 60" 70" 80" 90" 100" %"Cl3" 3

Organization of THM-100 System Electronics Cabinet Process Cabinet Chemical Reagents and Standards 4

Electronics Cabinet 5

Process Cabinet 6

Chemical Cabinet 7

LCD-UI (User Interface) 8

Colorimetric Detection – Fujiwara Reaction Ÿ Ÿ Ÿ Ÿ Ÿ Ÿ Ÿ Ÿ 9

Rates of the Colorimetric Reactions § Chloroform reacts more slowly than brominated THMs to form the Fujiwara product § The THM Speciation of each water sample is deduced from the kinetics of the Fujiwara reaction § 3 Measurements of Absorbance (t 1 , t 2 and t 3 ); Calculate Br3, Cl3 and X2 Optimized Fujiwara Reaction Kinetics for the Four THMs t3 t2 t1 0.45 0.40 0.35 Absorbance .e 0.30 0.25 0.20 Cl3 0.15 Br2Cl 0.10 BrCl2 0.05 Br3 0.00 0 200 400 600 800 1000 Time / secs 10

THM-100 Principal of Operation Analysis Steps THM-100 Process Flow • Draw Finished Water Sample Fill Purge Vessel (250 mL) • Extract THMs Purge Water Sample and Trap THMs • Concentrate THMs Desorb Trap and Dissolve THMs into Chemical Reaction Mixture • React THMs with Reagents Initiate the Fujiwara Reaction • Measure change in Absorptivity Spectrophotometric Detection at 540 nm • Determine Concentration of the THMs Quantitative Determination of THM Concentrations and Speciation • Report TTHM & CHCl 3 Make Results Available on the System and via 4-20 mA and OPC/MOD Bus 11

Schematic of THM-100 Components CONSUMABLE Syringe & Motor REAGENTS Vent Vent V04 Desorb gas 6 psi THM Standard 1 Reaction Reservoir THM Standard 2 (Heated) Trap & (4 mL) Desorb Solution 1 FACILITIES Column "Retainer" (for desorption) Solution 2 Optical "Developer" Spectro- (Base mixture) meter V01 Solution 3 Selector "Dilutor" Valve Cleaning / Solvent Gas Drying Vent Tube Purge gas Desorb Chemical 20 psi CDA (or N2) Reservoir Waste V03 (Room Temp) Drinking Vent (4 mL) Water Water V06 Vent / Source V02 Drain LEGEND Common Level Heated Sensor Closed Purge Vessel (250 mL) Open V01 Water Drain 12 12