Polishing of municipal secondary effluent using native microalgae consortia
| Autor: | Magdalena García-Martínez, Nidia Saavedra-Villarreal, Icela D. Barcelo-Quintal, Julio César Beltrán-Rocha, Juan Francisco Villarreal-Chiu, Luis Osornio-Berthet, Ulrico J. López-Chuken |
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| Rok vydání: | 2017 |
| Předmět: |
Environmental Engineering
Nitrogen 020209 energy Biofertilizer Biomass 02 engineering and technology 010501 environmental sciences Wastewater complex mixtures 01 natural sciences Phosphorus metabolism Water Purification Ammonia 0202 electrical engineering electronic engineering information engineering Microalgae Effluent 0105 earth and related environmental sciences Water Science and Technology Biodiesel Waste management Chemistry food and beverages Phosphorus Pulp and paper industry Biodiesel production Biofuels Aeration |
| Zdroj: | Water science and technology : a journal of the International Association on Water Pollution Research. 75(7-8) |
| ISSN: | 0273-1223 |
| Popis: | This work evaluates the use of native microalgae consortia for a dual role: polishing treatment of municipal wastewater effluents and microalgae biomass feedstock potential for biodiesel or biofertilizer production. An initial screening was undertaken to test N and P removal from secondary effluents and biomass production by 12 consortia. A subsequent treatment was performed by selected consortia (01 and 12) under three operational conditions: stirring (S), S + 12 h of daily aeration (S + A) and S + A enriched with CO2 (S + AC). All treatments resulted in compliance with environmental regulations (e.g. Directive 91/271/EEC) and high removal efficiency of nutrients: 64–79% and 80–94% of total N and PO43−-P respectively. During the experiments it was shown that pH alkalinization due to microalgae growth benefits the chemical removal of ammonia and phosphorus. Moreover, advantages of pH increase could be accomplished by intermittent CO2 addition which in this research (treatment S + AC) promoted higher yield and lipid concentration. The resulting dry biomass analysis showed a low lipid content (0.5–4.3%) not ideal for biodiesel production. Moreover, the high rate of ash (29.3–53.0%) suggests that biomass could be readily recycled as a biofertilizer due to mineral supply and organic constituents formed by C, N and P (e.g. carbohydrate, protein, and lipids). |
| Databáze: | OpenAIRE |
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