Related Experiment Video
Updated: Sep 28, 2025

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
Published on: December 6, 2018
Rapid and stable achievement of mainstream nitritation at low temperature using the competitive inhibition caused by
Xiaoxuan Yang1, Zhaoxu Peng2, Baodan Jin3
1College of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China.
Abstract:
The unstability of mainstream nitritation at low temperature has always been a limiting factor for the nitrogen removal from domestic wastewater by anammox. In this study, the competitive inhibition caused by the organics has been demonstrated as an effective strategy to rapidly and stably achieve mainstream nitritation. This strategy was based on our novel discovery that nitrite-oxidizing bacteria (NOB) was more susceptible to the organics inhibition than ammonia-oxidizing bacteria (AOB). Batch tests showed while NOB activity gradually decreased by 66.5%, AOB activity only decreased by 31.6% with the initial C/N ratio raising from 0.0 to 3.0. Furthermore, treating the actual domestic wastewater at 14-18 °C, mainstream nitritation was rapidly established within 12 days and then the nitrite accumulation ratio was stable at ∼92.1% during a long-term operation. This strategy could be easily and effectively applied in urban WWTPs through modifying the operation mode.
More Related Videos
08:05Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
Published on: October 7, 2020
09:38Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
Published on: January 7, 2019
Related Concept Videos
2° Amines to N-Nitrosamines: Reaction with NaNO2
Inorganic Nitrogen Assimilation
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
Preparation of Amines: Reduction of Oximes and Nitro Compounds
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H