Experimental study for the reduction of CO2emissions in wastewater treatment plant using microalgal cultivation
| Autor: | V. De Felice, Francesco Pirozzi, Floriana Iasimone, Antonio Panico |
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| Přispěvatelé: | Iasimone, F., De Felice, V., Panico, A., Pirozzi, F. |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0208 environmental biotechnology
Biomass 02 engineering and technology Wastewater treatment CO2 sequestration Microalgal production Raceway pond Chemical Engineering (miscellaneous) Waste Management and Disposal Process Chemistry and Technology 010501 environmental sciences Carbon sequestration Combustion 01 natural sciences Nutrient Biogas CO2sequestration 0105 earth and related environmental sciences sequestration Pulp and paper industry 020801 environmental engineering CO Wastewater Environmental science Sewage treatment |
| Popis: | Wastewater treatment plants (WWTPs) contribute to CO 2 emissions in atmosphere through direct (biological metabolism) and indirect (fuel combustion) oxidation of organic carbon. This detrimental effect of WWTPs operation can be mitigated by integrating the traditional treatment with a microalgae cultivation pond where CO 2 is fixed into autotrophic biomass and the positive side effect of removing nutrients also takes place. To test the feasibility of this modified WWTPs configuration, a pilot-scale 200 L raceway pond, operating outdoor, was designed and used for biomass cultivation in untreated urban wastewater. Nitrogen gas enriched with 20% CO 2 , simulating the exhausted gas of biogas combustion, was supplied continuously during daytime at different flowrates. The dynamics of microalgae growth as well as inorganic carbon and nutrients uptake were studied during the pond start-up and semi-continuous feeding conditions. The absorbed bio-available CO 2 was monitored during daylight for different gas flowrates (0.2, 0.4 and 1.0 L/min) and for wastewater semi-continuous feeding conditions (0.8 L/h). The highest efficiency, equal to 83%, of bio-available CO 2 fixation was obtained for the lowest gas flowrate of 0.2 L/min., whereas the highest CO 2 removal rate of 24.6 mg/L/min was reached for the highest gas flowrate of 1.0 L/min. Furthermore, this operating condition resulted in the highest microalgae biomass productivity of 28.3 g/d/m 2 . Nutrients removal was complete for each operating condition tested. |
| Databáze: | OpenAIRE |
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