Challenges in using allylthiourea and chlorate as specific nitrification inhibitors

Chemosphere
K TatariBarth Smets

Abstract

Allylthiourea (ATU) and chlorate (ClO3(-)) are often used to selectively inhibit nitritation and nitratation. In this work we identified challenges with use of these compounds in inhibitory assays with filter material from a biological rapid sand filter for groundwater treatment. Inhibition was investigated in continuous-flow lab-scale columns, packed with filter material from a full-scale filter and supplied with NH4(+) or NO2(-). ATU concentrations of 0.1-0.5 mM interfered with the indophenol blue method for NH4(+) quantification leading to underestimation of the measured NH4(+) concentration. Interference was stronger at higher ATU levels and resulted in no NH4(+) detection at 0.5 mM ATU. ClO3(-) at typical concentrations for inhibition assays (1-10 mM) inhibited nitratation by less than 6%, while nitritation was instead inhibited by 91% when NH4(+) was supplied. On the other hand, nitratation was inhibited by 67-71% at 10-20 mM ClO3(-) when NO2(-) was supplied, suggesting significant nitratation inhibition at higher NO2(-) concentrations. No chlorite (ClO2(-)) was detected in the effluent, and thus we could not confirm that nitritation inhibition was caused by ClO3(-) reduction to ClO2(-). In conclusion, ATU and ClO3(-) sho...Continue Reading

Citations

Aug 2, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Bing LiuHidenari Yasui
Feb 16, 2018·Bulletin of Environmental Contamination and Toxicology·D Galán MadrugaA Cristóbal López
Nov 20, 2021·Journal of Microbiological Methods·Carla Lopez, Charles W Knapp

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