4.5 Article

Denitrifying bioreactor inflow manifold design for treatment of aquacultural wastewater

期刊

AQUACULTURAL ENGINEERING
卷 88, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.aquaeng.2019.102036

关键词

Denitrification; Woodchip bioreactor; Recirculating aquaculture; Pilot-scale; Wastewater

资金

  1. United States Agricultural Research Service (USDA-ARS) [59-8082-5-001]
  2. Conservation Fund

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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 x W x D; 3.8 x 0.76 x 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 bior- eactors 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.

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