Impact of Dissolved Oxygen Limiting Strategies on the Simultaneous Partial Nitrification, Anammox and Denitrification (SNAD) Process

E3S Web of Conferences, Journal Year: 2025, Volume and Issue: 617, P. 01010 - 01010

Published: Jan. 1, 2025

The effect of dissolved oxygen (DO) limitation strategies on the nitrogen removal performance SNAD system under high DO damage was explored. Nitrogen efficiency (NRE) decreased rapidly in a environment (2.0-3.0 mg/L). NRE temporarily recovered to 87.32% after limiting strategy adopted. However, 59.35% with rapid increase nitrate concentration and average anaerobic ammonia oxidation rate 1.37 mg-TN/(gVSS-h). In order suppress gradually increasing concentration, further limited 0.3-1.0 mg/L. This effectively stabilised achieved recovery anammox bacteria (AnAOB) activity, but could not stably restore denitrification performance. At same time, pH dropped below 7, which hindered restoration efficacy. can AnAOB activity. Achieving stable may require synergistic adjustments alkalinity hydraulic retention among other strategies.

Language: Английский

Mechanisms driving anammox bacteria enrichment in constructed wetlands for self-purification of high-nitrogen polluted wastewater: Environmental gradients and microbial interactions

Journal of Environmental Sciences, Journal Year: 2025, Volume and Issue: unknown

Published: March 1, 2025

Language: Английский