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Piggery wastewater treatment with algae-bacteria consortia: pilot-scale validation and techno-economic evaluation at farm level
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  • Simone Rossi,
  • A. Pizzera,
  • M. Bellucci,
  • F. Marazzi,
  • V. Mezzanotte,
  • K. Parati,
  • Elena Ficara
Simone Rossi
Politecnico di Milano Dipartimento di Ingegneria Civile e Ambientale
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A. Pizzera
Politecnico di Milano Dipartimento di Ingegneria Civile e Ambientale
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M. Bellucci
Politecnico di Milano Dipartimento di Ingegneria Civile e Ambientale
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F. Marazzi
Universita degli Studi di Milano-Bicocca Dipartimento di Scienze dell'Ambiente e della Terra
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V. Mezzanotte
Universita degli Studi di Milano-Bicocca Dipartimento di Scienze dell'Ambiente e della Terra
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K. Parati
Instituto Sperimentale Italiano Lazzaro Spallanzani
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Elena Ficara
Politecnico di Milano Dipartimento di Ingegneria Civile e Ambientale

Corresponding Author:[email protected]

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Abstract

In this paper, the efficiency of an outdoor pilot-scale raceway pond treating the wastewaters generated by a large-scale piggery farm in Northern Italy was evaluated. The biomass productivity over the 208 days of experimentation was 10.7 ± 6.5 g TSS·m -2·d -1, and ammoniacal nitrogen, orthophosphate, and COD average removal efficiencies were 90%, 90%, and 59%, respectively. These results were used to carry out a comprehensive techno-economic analysis for the integration of algae-based processes in farms of different sizes (100 – 10000 pigs). Based on this evaluation, the amount of N disposed of on agricultural land can be reduced from 91% to 21%, increasing the fraction returned to the atmosphere from 2.4% to 63%, and the fraction in the biomass from 6.2% to 16%. In the case of intensive farming, the release of 110 t N·ha -1·y -1 contained in the liquid fraction of the digestate could be avoided by including algae-bacteria processes in the farm layout. The biomass production cost was as low as 3.4 \euro·kg -1, while the cost for nitrogen removal was 7.6 \euro·kg N -1.