Pig farming generates highly polluting wastewaters which entail serious environmental issues when not adequately managed. Microalgae systems can be promising for cost, energy and environment-efficient treatment of piggery wastewater (PWW). Aside from clean water, the produced biomass can be used as biostimulants and biopesticides contributing to a more sustainable agriculture. | Environmental Advances 4 2021 100062 Contents lists available at ScienceDirect Environmental Advances journal homepage locate envadv Biostimulant and biopesticide potential of microalgae growing in piggery wastewater Alice Ferreira a Lusine Melkonyan b c Sofia Carapinha a Belina Ribeiro a Daniel Figueiredo d Gayane Avetisova b c Luisa Gouveia a d a LNEG National Laboratory of Energy and Geology . Bioenergy and Biorefineries Unit Estrada do Paço do Lumiar 22 1649-038 Lisbon Portugal b SPC Armbiotechnology NAS RA 14 Gyurjyan Str. 0056 Yerevan Armenia c Yerevan State University 1 Alex Manoogian 0025 Yerevan Armenia d Green CoLab - Green Ocean Technologies and Products Collaborative Laboratory Centro de Ciências do Mar do Algarve Universidade do Algarve Campus Gambelas Edifício 7 8005-139 Faro Portugal a r t i c l e i n f o a b s t r a c t Keywords Pig farming generates highly polluting wastewaters which entail serious environmental issues when not ade- Tetradesmus obliquus quately managed. Microalgae systems can be promising for cost energy and environment-efficient treatment of Cyanobacteria piggery wastewater PWW . Aside from clean water the produced biomass can be used as biostimulants and Swine wastewater biopesticides contributing to a more sustainable agriculture. Germination index Plant protection Three microalgae Tetradesmus obliquus Chlorella protothecoides Chlorella vulgaris and one cyanobacterium Syne- chocystis sp. were selected after a preliminary screening in diluted wastewater 1 20 to treat PWW. The nutrient removals were 62-79 for COD chemical oxygen demand 84-92 for TKN total Kjeldahl nitrogen 79-92 for NH4 and over 96 for PO4 3 . T. obliquus and C. protothecoides were the most efficient ones. After treating PWW the produced biomass at g L 1 was assessed as a biostimulant for seed germination root shoot growth and pigment content for tomato watercress cucumber soybean wheat and barley seeds. We observed an overall increase on .
