Evaluation of polyhydroxybutyrate as a carbon source for recirculating aquaculture water denitrification

Document Type

Article

Publication Date

11-1-2012

Abstract

The effect of salinity, dissolved oxygen and NO 3-N concentration on the denitrification of recirculating aquaculture water using polyhydroxybutyrate (PHB) was evaluated. Four PHB media with different molecular weights and configurations were tested. The results show that at higher nitrate concentrations in the influent water, the consumed PHB:NO 3-N ratio decreased. An average of 2.9g of PHB:1g NO 3-N removed at temperatures of 20.8±1.1°C was measured.Although the molecular weight showed an apparent correlation with the denitrification rates, the correlation was not statistically significant. A moderately biofouled granular media displays a heterogeneity of microenvironments that allow some denitrification to occur in the presence of bulk dissolved oxygen levels approaching 5mgL -1. As a practical approach, the inhibitory effects of oxygen can be mitigated either by design of the denitrification media bed and/or by control or reduction of the influent dissolved oxygen levels. The high plastic consumption needed for oxygen removal indicates that the second approach is more cost efficient.At a flux of 60m 3m -2d -1 the denitrification rate decreases at a constant rate in the first 30cm of the PHB bed. Below this depth, the denitrification rate decreases very slowly and stays above 1kg-NO 3-Nm -3d -1.In a pragmatic sense, denitrification abilities can be expected to be similar in all salinities. Volumetric nitrate removal rates in the order of 2.5kg-NO 3-Nm -3 mediad -1 should be broadly obtained in fresh and marine water systems. In the range of up to 250mg NO 3-NL -1, the PHB can be used as a base for a passive denitrification unit that requires little management.The availability of an economic source of PHB such as production waste and the development of the bioplastic industry is determinant for the adoption of this material as a carbon source for denitrification processes. © 2012 Elsevier B.V.

Publication Source (Journal or Book title)

Aquacultural Engineering

First Page

36

Last Page

43

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