| Title | Transforming wastewater treatment plants in sustainable units coupled with local economies: Microalgae as resource recovery agents |
|---|---|
| ID_Doc | 21680 |
| Authors | Braga, MQ; Magalhaes, IB; Silveira, CF; Couto, E; Calijuri, ML; Assemany, P |
| Title | Transforming wastewater treatment plants in sustainable units coupled with local economies: Microalgae as resource recovery agents |
| Year | 2022 |
| Published | |
| Abstract | Besides reducing the sewage organic and nutrient load, microalgae-based wastewater treatments promote the recovery of important natural resources, such as N and P, which can be used for biofuels and animal feed pro-duction. In this context, the present study proposes a treatment system based on a circular economy and resource recovery of waste streams: an up-flow anaerobic reactor (UASB, widely used in developing countries such as Brazil) followed by high-rate algae ponds (HRAPs). Geographic Information Systems tools were used to select suitable areas for allocating the proposed system in Minas Gerais (Brazil). Two regions showed excellent suit-ability for allocating the UASB + HRAP system, with more than 70% coverage each. These areas cover 59 municipalities, with a production capacity of 43,565 m3/day of raw sewage, a volume that, after treatment, can be used for crop irrigation and fish farming. In addition, municipalities can produce 6621.9 kg/day of microalgae biomass. This biomass can generate 13.96 MWh/day of electrical energy, 1316.7 kg/day of nutrients for animal feed, 3.97 kg of beta-carotene, 2576.3 kg of biodiesel, 132.4 kg of Omega-3, 198.7 kg of glycerol or 1125.72 kg of ethanol. Productivities were calculated from three by-product valorization routes of the suggested system: en-ergy, agriculture, and high-value products. The proposed system improves current wastewater treatment stan-dards in the selected regions, with the potential to generate valuable resources compatible with attractive economic activities from these areas. |
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