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This article in JEQ

  1. Vol. 41 No. 6, p. 1989-2000
     
    Received: Mar 2, 2012
    Published: October 4, 2012


    * Corresponding author(s): albert.magri@gmail.com
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doi:10.2134/jeq2012.0092

Partial Nitritation of Swine Wastewater in View of Its Coupling with the Anammox Process

  1. Albert Magrí *,
  2. Matias B. Vanotti,
  3. Ariel A. Szögi and
  4. Keri B. Cantrell
  1. USDA–ARS Coastal Plains Soil, Water, and Plant Research Center, 2611 W. Lucas St., Florence, SC. Assigned to Associate Editor Amy Townsend-Small

Abstract

Partial nitritation (PN) of swine wastewater was investigated in a sequencing batch reactor (SBR) using a high-performance nitrifying sludge. Characteristics of the wastewater used were low content of biodegradable organic matter and a high alkalinity-to-ammonium ratio. The target oxidation of ammonium nitrogen (NH4+–N) to nitrite nitrogen (NO2–N) was 57% (1.32 g NO2–N g1 NH4+–N), which corresponds with the reaction ratio of the anaerobic ammonium oxidation (anammox). This target was successfully achieved at 32°C by controlling the inflow rate and the corresponding nitrogen loading rate (NLR). An average NLR of 1.47 g NH4+–N L−1 d−1 was applied to the partial nitritation sequencing batch reactor during a period of 70 d. The nitrite production rate obtained was 0.91 g NO2–N L−1 d−1. No nitrate was produced. The PN effluent contained 1.38 g NO2–N g−1 NH4+–N, which was within 5% of the target ratio. Under steady composition of the wastewater, the pH was shown to be a good indicator of the PN process performance. Furthermore, in a second sequencing batch reactor, the anaerobic ammonium oxidation process was effectively applied to the PN effluent, attaining a nitrogen conversion rate of 0.36 g N L−1 d−1 (14.3 mg N g−1 volatile suspended solids h−1).

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Copyright © 2012. Copyright © by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc.