Evaluation of N2O Formation from Anaerobic Ammonium Oxidation (Anammox) at Different Influent Ammonia to Nitrite Ratios

Name: Trairat Muangthong-on

keyword: N2O (nitrous oxide)

Abstract: An improper treatment design to remove nitrogen could cause negative effects to atmospheric environment by emission of nitrous oxide (N2O). With a conventional biological denitrification process under the condition of a low influent CODfN ratio or electron donor to electron acceptor ratio, N2O can be detected. However, recently, an autotrophic denitrificaiton process named ANAMMOX has been applied for nitrogen removal from wastewater containing high NH4+ but low carbon content. Anammox bacteria are able to use ammonia as electron donor and nitrite as electron acceptor under anaerobic condition. This study investigated the N20 production by Anammox process operated in SBR reactors with HRT of 4 days by varying influent ammonia to nitrite ratios or electron donor to electron acceptor ratios at 0.5:1, 0.75:1, and 1:1. The influent ammonia concentration also varied to 50, 75 and 100 mgN/L. There are eight experiments in this study. Three are triplicate runs of Rl(lOO) and the other are RO.75(100), RO.75(75), RO.5(lOO), RO.5(75) and RO.5(50). Comparing the average detected N20 gas in reactor headspace at feed ammonia concentration of 100 mgN/L that are 1.05, 2.04 and 200.55 ppm in Rl(lOO), RO.75(lOO) and RO.5(l00) respectively indicated that N2O production increases when electron donor in solution is limited. The results also show the significant higher substrate consumption mole ratio (Delta NO2-N/ Delta NH4-N) than Anammox stoichiometric one (1.32) when applying lower influent ammonia to nitrite ratio especially at high influent ammonia of that ratio. The nitrite was completely removed except in the experiment of RO.5(100) due to the excess nitrite at 200 mgN/L in the influent.

King Mongkut's University of Technology Thonburi. KMUTT Library

Address: BANGKOK

Email: info.lib@mail.kmutt.ac.th

Name: Chalermraj Wantawin

Role: Advisor

Created: 2010

Modified: 2012-01-07

Issued: 2555-01-03

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: JGSEE258

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Energy Technology

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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