Date: 2025 07-July 10

Mulch

• How can i embed the template name in the name of the mulch-scaffold.toml file, like mulch-scaffold.analysis-meeting.toml, and allow it to be found ?

Windows features

Windows optional features log - 10 July 2025

Hach Lunch and Learn

Intro

• BOD / COD / TOC
• Jeannie Radke
• Engineer: Lance __ Hach

Talk: Lance

BOD

• Biochemical oxygen demand
• BOD_5 : what does the 5 mean?
  • 5 days - how long it takes to run the test
  • What you were treating is already gone by the time you get your results.
  • It allegedly takes 5 day for water to run from London to the ocean via the Thames River.
• Infers what the micro organisms are up to
• Provides info about dissolved oxygen
• A true BOD test takes 28 days, to answer what the microorganism can really do, in terms of decomposing organic matter at a certain temperature.

COD

• Chemical oxygen demand
• Chromic acid is used to chemically oxidize the organics
• How long does it take: 2.5 hours.

TOC

• Total organic carbon
• Can be a bad pollutant to water
• TC = TIC + TOC = Total Inorganic Carbon + Total Organic Carbon
• The test takes 5.5 minutes
• Henry: Likely oxidizes more stuff than COD does.
• TOC is reported as carbon (12 electrons) while COD is reported as oxygen (32 electrons)

SAC

• Spectral absorption coefficient
• The measurement of UV absorption in water treatment for Total Organic Carbon
• It gives you a number instantly.
• Proxy number. Can be interfered with.

Correlations

• How many organic molecules are known: 70 million various organic combinations
• Methane is the simplest of organic compounds
• UV 254 does not recognize simple chain carbons like alcohol

Product

• Hach BioTector
• TOC Technology: Two Stage Advanced Oxidation (TSAO)
  • Cyclic: Runs, tests, self-cleans, ad infinitum
  • Every 5.5 minutes
  • B3500e:
    • 0-1000 ppm
    • +/- 60 ppb
    • Number of streams: 1
    • Application: wastewater effluent

Video

• Peristaltic hose pump to pump in acid for the TIC test
• TIC sparging with an inert gas
• CO_2 is measured with infrared technology
• Peristaltic hose pump to pump in base and later acid for the TOC test
• Chemicals need to be refilled every 6 months

More details

• Should be installed in an enclosure and protected by HVAC

Evonik Should Buy One of These

• What they are currently reading is capped by their range.

• Meet with Hach tech Caleb on Monday July 14th to see the Calibration process

  • Time?

Next steps:

• How would we collect TOC data to prepare information for acquisition?
• We would need 3 month of data to provide enough - realistically it ought to be a year, to understand all conditions.
• We only need a TOC testing unit at our effluent for now.
• Ball park number of cost: $80,000-$120,000 list, sans enclosure.
  • Manufactured in Cork, Ireland
  • Not subject to tariffs
• Replace the ones at Maxson
• Have Evonik buy one as well - their machine is dosing too highly.
• Tammy Westbrook: Prepare data in order to effectively have discourse with Evonik
  • Study at Maxson
  • Fill out a project form: Project - Grab sample for COD in DR6000 to compare with readout of COD
  • TOC Daily Procedure data collection
  • Jeanie will send TNT's and method / procedure