Did ya know? Presented by Dave Johnson Muskegon County Wastewater - - PowerPoint PPT Presentation

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Did ya know? Presented by Dave Johnson Muskegon County Wastewater - - PowerPoint PPT Presentation

Jun 08, 2023 471 likes •1.06k views

Did ya know? Presented by Dave Johnson Muskegon County Wastewater Management System E-mail: johnsonda@co.muskegon.mi.us www.federalregister.gov If your lab uses Standard Methods Online edition, youre golden. Fecal Coliform

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Did ya’ know?

Presented by Dave Johnson Muskegon County Wastewater Management System E-mail: johnsonda@co.muskegon.mi.us

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www.federalregister.gov

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If your lab uses Standard Methods Online edition, you’re golden.

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 Fecal Coliform (MPN)  Fecal Coliform (mFC)  Ammonia  BOD/CBOD  pH  Residual Chlorine  DO  TSS/VSS  Temperature  Hardness  Total Phosphorus  COD  Oil and Grease  Metals by Flame AA  Metals by GFAA  Metals By ICP  Metals by ICP-MS  Hg by CVAA  Total Cyanide  Total Phenols

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www.standardmethods.org/ PDF/EPA_Acceptable_ Version_WW_6-20-2012 _final.pdf

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 Fecal Coliform (MPN)  Fecal Coliform (mFC)  Ammonia  BOD/CBOD  pH  Residual Chlorine  DO  TSS/VSS  Temperature  Hardness  Total Phosphorus  COD  Oil and Grease  Metals by Flame AA  Metals by GFAA  Metals By ICP  Metals by ICP-MS  Hg by CVAA  Total Cyanide  Total Phenols

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 Fecal Coliform (MPN)  Fecal Coliform (mFC)  Ammonia  BOD/CBOD  pH  Residual Chlorine  DO  TSS/VSS  Temperature  Hardness  Total Phosphorus  COD  Oil and Grease  Metals by Flame AA  Metals by GFAA  Metals By ICP  Metals by ICP-MS  Hg by CVAA  Total Cyanide  Total Phenols

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 Fecal Coliform (MPN)  Fecal Coliform (mFC)  Ammonia  BOD/CBOD  pH  Residual Chlorine  DO  TSS/VSS  Temperature  Hardness  Total Phosphorus  COD  Oil and Grease  Metals by Flame AA  Metals by GFAA  Metals By ICP  Metals by ICP-MS  Hg by CVAA  Total Cyanide  Total Phenols

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 Fecal Coliform (MPN)  Fecal Coliform (mFC)  Ammonia  BOD/CBOD  pH  Residual Chlorine  DO  TSS/VSS  Temperature  Hardness  Total Phosphorus  COD  Oil and Grease  Metals by Flame AA  Metals by GFAA  Metals By ICP  Metals by ICP-MS  Hg by CVAA  Total Cyanide  Total Phenols

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New criterion for incubation time:

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New criterion for incubation time: 5 Days ± 6 Hours (Section 5, Part i)

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New requirement for the Glucose-Glutamic Acid Check (GGA)

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Set up THREE GGA

  • samples. The average

Measured BOD of the three samples must be 198 ± 30.5 mg/L (Section 6, Part b)

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New instructions for determining the detection limit for a sample.

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For samples with NO SEED and NO DILUTION: The detection limit equals the detection limit of the DO measurement method. (i.e., around 0.1 mg/L) (Section 8, Part b)

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For samples with NO SEED but which ARE DILUTED: The detection limit equals 2 mg/L multiplied by the dilution factor. (Section 8, Part b)

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For samples which are SEEDED and DILUTED: The detection limit equals 2 mg/L minus the seed correction, multiplied by the dilution factor. (Section 8, Part b)

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For samples which are SEEDED and DILUTED, the actual text does not say to multiply by the dilution

  • factor. However, common

sense would dictate

  • therwise.
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For samples which are SEEDED but NOT DILUTED: The detection limit is 0 mg/L. (Section 8, Part b)

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DO by Winkler

&

DO by Membrane Electrode

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New Minimum QC Requirements

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Sample Duplicate

(TABLE 4020:I. MINIMUM QUALITY CONTROL FOR METHODS IN PART 4000)

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Zero Check with Zero Oxygen Sample

(TABLE 4020:I. MINIMUM QUALITY CONTROL FOR METHODS IN PART 4000)

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How do you prepare a Zero Oxygen Sample? SM gives a vague recipe:

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“Add excess sodium sulfite, Na2SO3, and a trace of cobalt chloride, CoCl2, to bring DO to zero.”

(SM 4500-O G-2001, Section 3, Part a)

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20 g sodium sulfite, Na2SO3 10 mg cobalt chloride, CoCl2

(a few crystals)

1 L water

Dissolve with stir bar and stir

  • plate. Good for 8 hours.
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1 g sodium sulfite, Na2SO3 10 mg cobalt chloride, CoCl2

(a few crystals)

1 L water

Dissolve with stir bar and stir

  • plate. Good for 30 min.,

maybe longer.

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Carefully pour the standard into a BOD bottle up to the

  • neck. Add your Winkler

reagents and titrate.

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Carefully pour a portion of the standard into a beaker to attain a depth of 2 to 3 inches. Submerge the DO probe so that the tip is near the bottom of the beaker. Swirl gently and read.

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One manual for a Thermo membrane electrode meter says that the probe must be inserted in the zero standard for at least 5

  • minutes. Another says 2.5

minutes.

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There are some surprises in store for you when you explore the new versions of the Standard Methods methods.