Acta Scientific Agriculture (ASAG)(ISSN: 2581-365X)

Research Article Volume 5 Issue 7

Integrated Treatment of Pig Production Wastewaters Using Pre-treatment with Biomass Ash and Bioremediation by Microalgae

Catarina Viegas1* and Margarida Gonçalves1,2

1Mechanical Engineering and Resource Sustainability Center (MEtRICs), NOVA School of Science and Technology, Lisbon, Portugal
2Centro de Investigação Para a Valorização de Recursos Endógenos (VALORIZA), Instituto Politécnico de Portalegre, Portalegre, Portugal

*Corresponding Author: Catarina Viegas, Mechanical Engineering and Resource Sustainability Center (MEtRICs), NOVA School of Science and Technology, Lisbon, Portugal.

Received: June 08, 2021; Published: June 24, 2021

Abstract

Animal production leads to effluents with high loads of macro and micronutrients, and therefore with a huge potential of water bodies eutrophication. Conventional wastewater treatments are expensive, energy-consuming, release greenhouse gases (GHG), and produce a residual sludge. The use of microalgae for wastewater treatment allows recovery of nutrients (N, P, COD), minimize GHG emissions, and can significantly reduce costs relatively to conventional treatments. Microalgae have been used in the bioremediation of various effluents, such as sewage, manure, brewery, dairy, urban, among others.

In this work, piggery effluents were remediated by combining a physico-chemical pre-treatment with biomass ash and bioremediation with microalgae (Chlorella vulgaris, Chlorella protothecoides and Tetradesmus obliquus). The mixture of piggery effluent with biomass ash was stirred and fractionated by decantation to yield a liquid fraction and a solid precipitate. The fortification of the liquid fraction with olive-oil mill wastewater was also evaluated. Microalgae grown in the pre-treated effluent, in semi-continuous mode reached productivities of 258 and 237 mg L-1day-1 for C. vulgaris and T. obliquus, respectively. Both microalgae reached nutrient removal efficiencies of 100, 100, 90, and 100% for N, P, COD, and BOD5, respectively. The microalgae composition was evaluated in terms of protein, sugar, lipid, fatty acids and ash contents.

The produced microalgae biomass was tested as biostimulants for the germination of wheat and watercress seeds with positive results, namely the fortification with C. vulgaris biomass produced an increase of 86% in the germination index of watercress seeds. The solid precipitate was tested as fertilizer for the germination of the same seeds, but the results were not as good as applying the algal biomass.

Keywords: Bioremediation; Wastewater Treatment; Piggery Effluents; Biomass Ash; Olive-oil Mill Wastewater; Fertilization

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Citation

Citation: Catarina Viegas and Margarida Gonçalves. “Integrated Treatment of Pig Production Wastewaters Using Pre-treatment with Biomass Ash and Bioremediation by Microalgae". Acta Scientific Agriculture 5.7 (2021): 44-57.

Copyright

Copyright: © 2021 Catarina Viegas and Margarida Gonçalves. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.




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