[Removing nitrogen from low-C/N-piggery-wastewater using shortcut nitrification/denitrification-ANAMMOX]

Aiming at the problem of deficiency of organic carbon source in piggery wastewater treatment by traditional method, shortcut nitrification/denitrification-ANAMMOX was used to remove nitrogen in piggery wastewater with low C/N in SBBR reactors. The results showed that shortcut nitrification/denitrification provided good influent conditions for ANAMMOX. High nitrogen removal efficiency of piggery wastewater by ANAMMOX was achieved and the average removal percentage of ammonium, nitrite and total nitrogen reached 91.8%, 99.3%, 84.1%, respectively. The performance of ANAMMOX process was not affected by the residual organic compounds in piggery wastewater. The average variation ratio of ammonium, nitrite and nitrate was 1:1.21:0.24. The analysis of GC/MS showed that there was little difference between the organic compounds in influent and effluent of ANAMMOX, and main organic compounds were saturated hydrocarbon and ester. The microorganism system was composed of anammox bacteria, ammonium oxidizer, nitrite oxidizer and denitrification bacteria together, and ANAMMOX bacteria was the main functional bacteria for nitrogen removal in this system.