TY - JOUR
T1 - Denitrifying bioreactor inflow manifold design for treatment of aquacultural wastewater
AU - Lepine, Christine
AU - Christianson, Laura
AU - McIsaac, Gregory
AU - Summerfelt, Steven
N1 - Funding Information:
Special thanks to Karen Schroyer, Natalie Redman, Megan Murray, Ella Bushman, Kevin Turner, and Destiny Evy for water chemistry analyses; to Layne Leake and Lauren Cheeks for technician assistance; to Kata Sharrer for engineering drawings; to John Davidson for editing assistance; and Fred Ford, Shanen Cogan, and Scott Tsukuda for physical and technical assistance. This research was supported by the United States Agricultural Research Service (USDA-ARS) under Agreement Number 59-8082-5-001 . Opinions and conclusions are of the authors and do not necessarily reflect the views of the USDA. Mention of trade names or commercial products in this article is solely for providing specific information and does not imply recommendation or endorsement. The Conservation Fund and the USDA are equal opportunity providers/employers. Appendix A
Funding Information:
Special thanks to Karen Schroyer, Natalie Redman, Megan Murray, Ella Bushman, Kevin Turner, and Destiny Evy for water chemistry analyses; to Layne Leake and Lauren Cheeks for technician assistance; to Kata Sharrer for engineering drawings; to John Davidson for editing assistance; and Fred Ford, Shanen Cogan, and Scott Tsukuda for physical and technical assistance. This research was supported by the United States Agricultural Research Service (USDA-ARS) under Agreement Number 59-8082-5-001. Opinions and conclusions are of the authors and do not necessarily reflect the views of the USDA. Mention of trade names or commercial products in this article is solely for providing specific information and does not imply recommendation or endorsement. The Conservation Fund and the USDA are equal opportunity providers/employers.
Publisher Copyright:
© 2019 The Authors
PY - 2020/2
Y1 - 2020/2
N2 - Recirculating aquaculture systems (RAS) facilities subject to point-source effluent regulations need to implement cost-effective N remediation for their wastewater outflows. Relatively low-cost denitrifying “woodchip” bioreactors can effectively remove N from aquaculture effluents for at least one year, but questions remain about bioreactor lifespan for aquacultural wastewaters. Four pilot-scale bioreactors (L × W × D; 3.8 × 0.76 × 0.76 m), two with a conventional single distribution inflow manifold and two with an experimental multiple-header, feed-forward distribution manifold, were operated over 784 d to observe second-year N removal performance and to determine if the manifold design can influence bioreactor effectiveness. The study also quantified performance metrics for chemical oxygen demand, total suspended solids, and phosphorus. Manifold style did not have notable impact on bioreactor performance when treating wastewater under the facilities’ normal operating conditions, but the multiple distribution style demonstrated an 11 % increase in nitrate and 12 % increase in total suspended solids removal efficiency over the single distribution manifold toward the end of the study when bioreactors treated higher strength wastewater. Additionally, bioreactor performance in both manifold designs decreased from an average of 92 % total suspended solids removal efficiency under normal operating conditions to <76 % when treating the high-strength wastewater. The bioreactors provided N removal rates of 17−25 g NO3-N m−3 d−1 during the second year of study, demonstrating woodchip bioreactors can effectively treat aquaculture effluent for at least two years without major detrimental impacts due to clogging.
AB - Recirculating aquaculture systems (RAS) facilities subject to point-source effluent regulations need to implement cost-effective N remediation for their wastewater outflows. Relatively low-cost denitrifying “woodchip” bioreactors can effectively remove N from aquaculture effluents for at least one year, but questions remain about bioreactor lifespan for aquacultural wastewaters. Four pilot-scale bioreactors (L × W × D; 3.8 × 0.76 × 0.76 m), two with a conventional single distribution inflow manifold and two with an experimental multiple-header, feed-forward distribution manifold, were operated over 784 d to observe second-year N removal performance and to determine if the manifold design can influence bioreactor effectiveness. The study also quantified performance metrics for chemical oxygen demand, total suspended solids, and phosphorus. Manifold style did not have notable impact on bioreactor performance when treating wastewater under the facilities’ normal operating conditions, but the multiple distribution style demonstrated an 11 % increase in nitrate and 12 % increase in total suspended solids removal efficiency over the single distribution manifold toward the end of the study when bioreactors treated higher strength wastewater. Additionally, bioreactor performance in both manifold designs decreased from an average of 92 % total suspended solids removal efficiency under normal operating conditions to <76 % when treating the high-strength wastewater. The bioreactors provided N removal rates of 17−25 g NO3-N m−3 d−1 during the second year of study, demonstrating woodchip bioreactors can effectively treat aquaculture effluent for at least two years without major detrimental impacts due to clogging.
KW - Denitrification
KW - Pilot-scale
KW - Recirculating aquaculture
KW - Wastewater
KW - Woodchip bioreactor
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U2 - 10.1016/j.aquaeng.2019.102036
DO - 10.1016/j.aquaeng.2019.102036
M3 - Article
AN - SCOPUS:85076000436
SN - 0144-8609
VL - 88
JO - Aquacultural Engineering
JF - Aquacultural Engineering
M1 - 102036
ER -