EPA Science Inventory

Innovative Biological Water Treatment for the Removal of Elevated Ammonia

Citation:

Lytle, D. A., C. White, D. Williams, L. Koch, AND E. Nauman. Innovative Biological Water Treatment for the Removal of Elevated Ammonia. Journal AWWA. American Water Works Association, Denver, CO, 105(9):E524-E539, (2013).

Description:

The objective of this work was to demonstrate the effectiveness of an innovative and simple biological water treatment approach for removing 3.3 mg N/L ammonia and iron from water using a pilot study conducted at a utility in Iowa. Biological water treatment can be an effective approach to addressing low ammonia levels, however, providing adequate oxygen to address source water ammonia levels greater than 1.5 mg N/L is challenging. The treatment consisted of a biological “contactor” combined with aeration, followed in series with a dual granular media. Orthophosphate was necessary to satisfy biological nutrient requirements and maintaining near-saturated dissolved oxygen levels throughout the contactor was important. The pilot demonstrated that a contactor and filter operated at loading rates of 2.2 gpm/ft2 and 2.0 gpm/ft2, respectively, met desired finished water quality objectives. The contactor alone was able to completely biologically oxidize all of the ammonia to nitrate. Contactor maintenance was minimal.

Purpose/Objective:

The objective of this work was to demonstrate the effectiveness of an innovative and simple biological water treatment approach to remove more than 3 mg N/L ammonia and iron from the water through a pilot study conducted at a water utility in Iowa. The study also identified operating parameters necessary to meet the desired goal of complete ammonia and iron removal, and discuss the design of a full-scale system with the same goals. Study results will benefit a range of systems across the United States by providing guidance on the design and operation of biological treatment systems for ammonia removal.

URLs/Downloads:

http://dx.doi.org/10.5942/jawwa.2013.105.0109   Exit

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Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Start Date: 09/01/2013
Completion Date: 09/01/2013
Record Last Revised: 02/25/2014
Record Created: 02/07/2014
Record Released: 02/07/2014
OMB Category: Other
Record ID: 268375

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

WATER SUPPLY AND WATER RESOURCES DIVISION

TREATMENT TECHNOLOGY EVALUATION BRANCH