Effect of four different pretreatments in the anaerobic digestion and nutrient removal of effluents from a recirculating aquaculture system

Juan P. González-Hermoso, Manuel Segovia

Submited: 2016-05-29 02:25:07 | Published: 2017-05-18 16:16:28

DOI: https://doi.org/10.3856/vol45-issue2-fulltext-4

Abstract


Intensive aquaculture recirculating systems (RAS) produce effluents (dissolved and particulate solids) with concentrations of nitrogen and phosphorus which are a potential source of pollution if they are not properly treated. The sludge and nutrient removal by anaerobic digestion has become an alternative for aquaculture sludge digestion and stabilization.  In this study we determine the effect of four different pretreatments (alkaline, mechanical, thermal and biological) in sludge reduction and denitrification efficiency, biogas production and nitrogen and phosphorus dynamics from a hyperintensive tilapia nilotica culture. Our results showed that greatest sludge reduction was detected on November, > 65% with the thermal pre-treatment. The denitrification process was effective in all pre-treatments with 90% reduction, with the exception of the alkaline pre-treatment. The biogas production was significantly higher in the thermal, mechanical and biological pre-treatments than control. The results indicate thatthe application of pre-treatments in the aquaculture effluents improves the denitrification processes and anaerobic digestion and can reduce the hydraulic retention time.


González-Hermoso J, Segovia M. Effect of four different pretreatments in the anaerobic digestion and nutrient removal of effluents from a recirculating aquaculture system. Lat. Am. J. Aquat. Res.. 2017;45(2): 276-292. Available from: doi:10.3856/vol45-issue2-fulltext-4 [Accessed 24 Jan. 2019].
González-Hermoso, J., & Segovia, M. (2017). Effect of four different pretreatments in the anaerobic digestion and nutrient removal of effluents from a recirculating aquaculture system. Latin American Journal of Aquatic Research, 45(2), 276-292. doi:http://dx.doi.org/10.3856/vol45-issue2-fulltext-4