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Nice MWD CA1710008 County: Lake Jar Test

Nice MWD CA1710008 County: Lake Jar Test. by Guy Schott, P.E. December 18-27, 2018. Nice MWC Source Water: Clear Lake Conventional Treatment. Nice MWC Source Water: Clear Lake. UVT/UVA.

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Nice MWD CA1710008 County: Lake Jar Test

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  1. NiceMWDCA1710008County: LakeJar Test by Guy Schott, P.E. December 18-27, 2018

  2. Nice MWCSource Water: Clear LakeConventional Treatment

  3. Nice MWCSource Water: Clear Lake

  4. UVT/UVA • UV transmittance or UVT is a measurement of the amount of ultraviolet light (commonly at 254 nm due to its germicidal effect) that passes through a water sample compared to the amount of light that passes through a pure water sample. The measurement is expressed as a percentage, % UVT. • UVA – UV absorbance is calculated as a relative measure of the amount of light absorbed by a water sample compared with the amount of light absorbed by a pure water sample. • UVA = -log(%UVT/100)

  5. Coagulants Used for Jar Testing

  6. Laboratory Charge Analyzer LCA: Used to determine coagulant demand of a source water entering the treatment plant. Source pH: 7.93 - 8.05 pH adjusted to 7.5 w/acetic acid 9800: 27.3 - 30.5 mg/L as product 2) Source pH: 8.07 Added 2.2 mg/L of NaOCl pH adjusted to 7.5 w/acetic acid 9800: 31.8 mg/L as product 3) Source pH: 7.96 no pH adjustment 9800: 37 mg/L as product

  7. Nice MWC: Jar Test Results Coagulant dosages are reported as product.

  8. Nice MWC: Jar Test Results Coagulant dosages are reported as product.

  9. Jar Test Set 1

  10. End of 5 minute flocculation (30 RPM) period 2.2 mg/L NaOCl 30 mg/L 9800 Filtrate 0.05 NTU Settled: 1.2 NTU 2.2mg/L NaOCl 24 mg/L 9800 Filtrate 0.08 NTU Settled: 1.0 NTU 24 mg/L 9800 Filtrate 0.12 NTU Settled: 0.8 NTU 30 mg/L 9800 Filtrate 0.09 NTU Settled: 1.4 NTU

  11. 2.2mg/L NaOCl 24 mg/L 9800 Filtrate 0.08 NTU Settled: 1.0 NTU 2.2 mg/L NaOCl 30 mg/L 9800 Filtrate 0.05 NTU Settled: 1.2 NTU 24 mg/L 9800 Filtrate 0.12 NTU Settled: 0.8 NTU 30 mg/L 9800 Filtrate 0.09 NTU Settled: 1.4 NTU After 25 minute of setting, settled water turbidity is taken.

  12. Jar Test Set 2

  13. 2.2 mg/L NaOCl 40 mg/L 9800 Filtrate 0.06 NTU Settled: 0.5 NTU 2.2 mg/L NaOCl 45 mg/L 9800 Filtrate 0.06 NTU Settled: 0.9 NTU 2.2 mg/L NaOCl 30 mg/L 9800 Filtrate 0.09 NTU Settled: 0.4 NTU 2.2 mg/L NaOCl 35 mg/L 9800 Filtrate 0.06 NTU Settled: 0.4 NTU Towards end of 5 minute flocculation (30 RPM) period

  14. 2.2 mg/L NaOCl 45 mg/L 9800 Filtrate 0.06 NTU Settled: 0.9 NTU 2.2 mg/L NaOCl 40 mg/L 9800 Filtrate 0.06 NTU Settled: 0.5 NTU 2.2 mg/L NaOCl 35 mg/L 9800 Filtrate 0.06 NTU Settled: 0.4 NTU 2.2 mg/L NaOCl 30 mg/L 9800 Filtrate 0.09 NTU Settled: 0.4 NTU After 25 minute of setting, settled water turbidity is taken.

  15. Jar Test Set 3

  16. 2.5 mg/L NaOCl 43 mg/L 9800 Filtrate 0.05 NTU UVT: 90.9% UVA: 0.041/cm Settled: 0.20 NTU 2.5 mg/L NaOCl 37 mg/L 9800 Filtrate 0.05 NTU UVT: 90.7% UVA: 0.042/cm Settled: 0.60 NTU 2.5 mg/L NaOCl 50 mg/L 9800 Filtrate 0.05 NTU UVT: 91.2% UVA: 0.040/cm Settled: 0.60 NTU 2.5 mg/L NaOCl 30 mg/L 9800 Filtrate 0.08 NTU UVT: 90.3% UVA: 0.044/cm Settled: 0.20 NTU Towards end of 5 minute flocculation (30 RPM) period

  17. 2.5 mg/L NaOCl 50 mg/L 9800 Filtrate 0.05 NTU UVT: 91.2% UVA: 0.040/cm Settled: 0.60 NTU 2.5 mg/L NaOCl 43 mg/L 9800 Filtrate 0.05 NTU UVT: 90.9% UVA: 0.041/cm Settled: 0.20 NTU 2.5 mg/L NaOCl 37 mg/L 9800 Filtrate 0.05 NTU UVT: 90.7% UVA: 0.042/cm Settled: 0.60 NTU 2.5 mg/L NaOCl 30 mg/L 9800 Filtrate 0.08 NTU UVT: 90.3% UVA: 0.044/cm Settled: 0.20 NTU After 25 minute of setting, settled water turbidity is taken.

  18. Jar Test Set 4

  19. Towards end of 5 minute flocculation (30 RPM) period 2.5 mg/L NaOCl 30 mg/L 9800 4.5 mg/L 9890 Filtrate 0.07 NTU UVT: 90.8% UVA: 0.042/cm Settled: 0.28 NTU 2.5 mg/L NaOCl 37 mg/L 9800 5.6 mg/L 9890 Filtrate 0.06 NTU UVT: 90.9% UVA: 0.041/cm Settled: 0.26 NTU 2.5 mg/L NaOCl 43 mg/L 9800 6.4 mg/L 9890 Filtrate 0.07 NTU UVT: 91.0% UVA: 0.041/cm Settled: 0.30 NTU 2.5 mg/L NaOCl 50 mg/L 9800 7.5 mg/L 9890 Filtrate 0.05 NTU UVT: 91.3% UVA: 0.040/cm Settled: 0.40 NTU

  20. 2.5 mg/L NaOCl 30 mg/L 9800 4.5 mg/L 9890 Filtrate 0.07 NTU UVT: 90.8% UVA: 0.042/cm Settled: 0.28 NTU 2.5 mg/L NaOCl 37 mg/L 9800 5.6 mg/L 9890 Filtrate 0.06 NTU UVT: 90.9% UVA: 0.041/cm Settled: 0.26 NTU 2.5 mg/L NaOCl 43 mg/L 9800 6.4 mg/L 9890 Filtrate 0.07 NTU UVT: 91.0% UVA: 0.041/cm Settled: 0.30 NTU 2.5 mg/L NaOCl 50 mg/L 9800 7.5 mg/L 9890 Filtrate 0.05 NTU UVT: 91.3% UVA: 0.040/cm Settled: 0.40 NTU After 25 minute of setting, settled water turbidity is taken.

  21. Jar Testing – Procedures • Fill jars with source water prior to coagulant injection and set paddle speed at 30 rpm • Add chemicals (i.e., NaOCl, primary coagulant, coagulant aid) to each jar • Flash mix for 1 minute (200 rpm for 1 liter jars; up to 300 rpm for 2 liter jars) • Slow mix for 5 minutes (30 rpm for 1 liter jars, up to 40 rpm for 2 liter jars) • Settled for 5 minutes • Syringe 25 mL from each jar taken ½-inch below surface (25 mL/12 sec rate) • Filtered through 1.2 um isopore membrane into cuvette (drip rate, 15 mL/90 sec) • Measure filtrate turbidity, chlorine residual and %UVT or UVA • Measure settled water turbidity after 25 minutes of total setting • Record all data

  22. Jar TestFilterability Test Equipment Turbidity Instrument Syringe w/Luer-Lock Tip, 30 cc (part#: 2225800, by Hach) Swinnex Filter Holder, 25 mm (part#: SX0002500) Isopore Membrane Filter, 1.2 um, 25 mm (part #: RTTP02500) http://www.sigmaaldrich.com/

  23. Jar Test - Filterability Test Syringe ~ 25 mL from jar (after 5 minutes of settling) Filter-to-waste 3-5 mL Filter directly into clean cuvette Measure turbidity Note: Take several readings before recording final NTU results. Micro bubbles can adhered to glass causing false NTU readings. To remove bubbles, tilt cuvette up to 90 degrees.

  24. Contact • Guy Schott, P.E. • State Water Resources Control Board • Division of Drinking Water • Santa Rosa, CA For Stock Solution/Dosage calculations go to: • https://www.waterboards.ca.gov/drinking_water/programs/districts/mendocino_district.html • Guy.Schott@waterboards.ca.gov • 707-576-2732

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