A Novel Process for Biological Nitrogen Removal from Dairy Wastewater in Constructed WetlandsEPA Grant Number: SU833910
Title: A Novel Process for Biological Nitrogen Removal from Dairy Wastewater in Constructed Wetlands
Investigators: Tao, Wendong , Diemont, Stewart , Hassett, J.
Current Investigators: Tao, Wendong , Diemont, Stewart , Hassett, J. , Shayya, Walid
Institution: SUNY College of Environmental Science and Forestry
EPA Project Officer: Nolt-Helms, Cynthia
Project Period: August 15, 2008 through August 14, 2009
Project Amount: $10,000
RFA: P3 Awards: A National Student Design Competition for Sustainability Focusing on People, Prosperity and the Planet (2008) RFA Text | Recipients Lists
Research Category: P3 Challenge Area - Water , P3 Challenge Area - Agriculture , Pollution Prevention/Sustainable Development , P3 Awards , Sustainability
Constructed wetlands are a low-energy alternative to conventional methods for removal of nitrogen from high-ammonia wastewaters. Literature on constructed wetlands stresses oxygen supply to trigger nitrification and denitrification for biological nitrogen removal. However, integration of partial nitrification and anaerobic ammonium oxidation into constructed wetlands will increase nitrogen removal efficiency without artificial aeration and minimize greenhouse gas emission. During Spring 2008, students in Ecological Engineering for Waste Management course and Introduction to Ecological Engineering course are initiating research into ecologically-engineered treatment systems. Students will design and test innovative mesocosm constructed wetlands to incorporate partial nitrification and anaerobic ammonium oxidation for removal of nitrogen from dairy wastewater.
Culturing bacteria for anaerobic ammonium oxidation is difficult due to their slow growth rate. During Fall 2008, students in the Water Pollution Engineering class will develop two microcosm biofilters, which will be operated under optimal conditions to enrich bacteria for anaerobic ammonium oxidation. The biofilters will be evaluated with mass balance analysis and reaction modeling. Students in the Spring 2009 Ecological Engineering courses will build and operate the mesocosm constructed wetlands, which will be seeded with the bacteria from the microcosm biofilters. Treatment performance and operational conditions of the mesocosm constructed wetlands with different configurations and operating modes will be tracked by field measurements and laboratory analyses. Design considerations will be derived from the monitoring results. The most efficient design will be scaled up at a dairy farm for demonstration in Phase II.
1). a reliable seeding source of anaerobic ammonium oxidation bacteria; 2). design considerations of constructed wetlands using partial nitrification and anaerobic ammonium oxidation for removal of nitrogen from dairy wastewater.