ISO 9509 Nitrification Inhibition Study - ACWI
ISO 9509 NitrificationInhibition Study
PresentersGeoff HinshelwoodUniversal Laboratoriesgeoff@universallaboratories.netDuane WildingMaryland Environmental Service
BackgroundMidshore Regional Landfilldischarged leachate to Eastonwastewater lagoon systemEaston’s new ENR WWTP –concerns with treating leachate dueto potential toxicity or inhibition withsensitive nitrification processesMES requested to demonstrate“no toxicity or inhibition” of leachate
Composite Data
Principal Concerns High NH3 in Leachate representing5 - 15 % of Influent Heavy metals, e.g., zinc – Highspikes with generally low values Sufficient storage during wetweather flow
Nitrification/ DeNitrification- 1.5 O2 Æ NO2 H2O 2 H NH4 - oxidizing bacteria oxidize NH4 to NO2NH4 NO2- 0.5 O2 Æ NO3NO3– -oxidizing bacteria oxidize NO2- to NO3-
ISO 9509 ISO 9509 second edition2006-07-01 Toxicity test for assessing theinhibition of nitrification ofactivated sludgemicroorganisms ISO Method expanded toinclude testing for“denitrification”
Lessons Learned
Easton Wet Bench
Easton aeration set-up
Test ResultsTotal of 30 test vessels fornitrificationTotal of 20 test vessels fordenitrificationNo inhibition wasobserved
Summary Data Table 3Summary Nitrate Table (mg/L of NO3)run 1 run 2Controlrun 3run 4run nder 439.5558.2025.4536.1549.20cylinder 348.4034.7037.6528.6010.70cylinder 237.6049.1035.5232.6048.50cylinder 195.8054.0015.6014.6020.60Inhibited Control
ANOVA Data Table 4GroupsControlCylinder 4Cylinder 3Cylinder 2Cylinder 58.361231.6
Lessons Learned1. This type of testing isneeded due to new ENRprocesses being used2. Only nitrification testingcan determine inhibitionto ENR processes.3. Need to have “fresh”mixed liquor4. Recommend regular“nitrification rate” testingto regularly monitorprocess performance.
Outcome of TestingResults presented to MDE and Easton Utilitieson Jan. 16, 2007EU to allow discharge of untreated leachate fora trial period of 3 monthsPresently discharging with no impact20 gal/min from 6 am to 12 midnight and 10gal/min from midnight to 6 am
Conclusions / Summaryy Testing allowed receiving approval to dischargeuntreated leachate for a trial periody Will save several millions dollarsy MES will pay Easton Utilities a surcharge for treatingthe high strength wastes.
Acknowledgements:y Easton Utilities Staffy Maryland Department of the Environmenty Stearns & Wheler Staffy Landfill staffy Universal Laboratories Staff
ISO 9509 ISO 9509 second edition 2006-07-01 Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms ISO
Effect of temperature on nitrification kinetics 4 Effect of pH on nitrification kinetics . 5 Results and discussion 6 Effect of temperature on nitrification kinetics 6 Effect of pH on nitrification kinetics 13 Summary and conclusions 16 Literature cited 17 Appendix A: Data collected for the temperature experiment . . 21
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ISO 18400-107, ISO 18400-202, ISO 18400-203 and ISO 18400-206, cancels and replaces the first editions of ISO 10381-1:2002, ISO 10381-4:2003, ISO 10381-5:2005, ISO 10381-6:2009 and ISO 10381-8:2006, which have been structurally and technically revised. The new ISO 18400 series is based on a modular structure and cannot be compared to the ISO 10381
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