2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 12:00 PM - 12:15 PM | DISSOLVED INORGANIC CARBON LIMITATION IN FILAMENTOUS ALGAL WASTEWATER TREATMENT FLOWAYS IN NEW ZEALAND | 251 AB
DISSOLVED INORGANIC CARBON LIMITATION IN FILAMENTOUS ALGAL WASTEWATER TREATMENT FLOWAYS IN NEW ZEALAND
Nutrient discharges can stimulate harmful algal blooms, cause fish kills, impair of wildlife habitat, restrict human recreation, and release harmful toxins into drinking water sources. However in the US only 30% of wastewater effluent is treated to remove nutrients. Thus, it is critical to develop and implement technologies to eliminate nutrient pollution from wastewater effluent. One promising approach uses filamentous algae to remove nutrients. Because these algae photosynthesize rapidly in wastewater floways, algal growth may become limited by the availability of dissolved inorganic carbon (DIC). This hypothesis was tested in 3 experiments conducted in New Zealand using 15-m long, 1-cm deep floways. Experiments compared algal growth and nutrient removal with and without the addition of carbon dioxide. Primary treated wastewater infused with carbon dioxide stimulated 30% more algal biomass. However, DIC infused wastewater did not show enhanced nitrogen or phosphorus removal. These experiments are consistent with the hypothesis that DIC can become limiting in large-scale filamentous algal wastewater treatment systems. It is possible that DIC may limit algal production in other nutrient enriched streams exposed to full sun.
- Nutrients
- Water Quality
- Periphyton
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Presenters/Authors
Troy Keller
(), Columbus State Unviersity, keller_troy@columbusstate.edu;
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Rupert Craggs
(), National Institute of Water and Atmospheric Research Ltd, Rupert.Craggs@niwa.co.nz;
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