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Title: VALORIZATION OF THE SECONDARY THICKENER WASTEWATER FROM THE CONVENTIONAL DEPURATION PLANTS AS A SUBSTRATE FOR MICROALGAE BIOMASS PRODUCTION
VALORIZATION OF THE SECONDARY THICKENER WASTEWATER FROM THE CONVENTIONAL DEPURATION PLANTS AS A SUBSTRATE FOR MICROALGAE BIOMASS PRODUCTION

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Amani Belaiba; Mha Albqmi; Sebastian Sanchez; Gassan Hodaifa
10.5593/sgem2022V/6.2/s25.49
10.5593/sgem2022V/6.2
1314-2704
978-619-7603-52-1
English
22
6.2
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Advances in Biotechnology
Conventional wastewater treatment plants (CWWTPs) play a key role in reducing the environmental impact of urban wastewater. But nowadays, this role goes even further with climate change, water scarcity, and the current energy crisis. After the thickening of the secondary sludge, a wastewater flow is generated, which is normally recirculated to the plant head for further treatment. This work aims to use secondary thickener wastewater (STW) as a culture medium for Chlorella vulgaris, Neochloris oleoabundans and Scenedesmus quadricauda growth. These microalgae have the capacity to remove organic and inorganic matters, particularly, in wastewater rich in nitrogen and phosphate compounds. The experiments have been carried out in stirred photobioreactors with 1 L capacity under the following common operating conditions pH 8, mechanical agitation = 200 rpm, air supply rate = 0.5 L/min, continuous artificial illumination intensity = 359 ?E m-2 s-1, and non-sterilized conditions. The net biomass generated for C. vulgaris, N. oleoabundans, and S. quadricauda was 1.89 g/L, 2.73 g/L, and 2.52 g/L, respectively. The kinetic growth study showed a maximum specific growth rate, volumetric biomass productivity and culture duration for C. vulgaris (0.0128 h-1, 0.00583 g/(L h), and 429 h), for N. oleoabundans (0.0151 h-1, 0.00456 g/(L h), and 429 h), and for S. quadricauda (0.0146 h-1 and 0.007362 g/(L h), and 509 h). The microalgae biochemical composition determined biomass rich in energetic compounds (carbohydrates and lipids contents) between 70.9 % and 86.8 % with lower proteins and lipids contents between 9.17 % and 11.5 % and 6.29 % and 13.9 %, respectively. The final water quality registered lower chemical oxygen demand (COD) less than 157 mg O2/L. The final treated water can be direct discharge or used for irrigation.
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[7] G. Hodaifa, Aprovechamiento de las aguas residuales de la industria oleica en la produccion de biomasa microalgas 2004.
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This research work has been funded by the European Regional Development Fund (ERDF) and by the Regional Ministry of Economy, Knowledge, Business and University, Andalusian Regional Government (Consejeria de Economia, Conocimiento, Empresas y Universidad, de la Junta de Andalucia), in the framework of the Operational Programme FEDER-Andalucia 2014-2020. Specific objective 1.2.3. "Promotion and generation of frontier knowledge and knowledge oriented to the challenges of society, development of emerging technologies") in the framework of the reference research project (Project title: Revalorisation and reuse of gaseous effluents (combustion gases "CO2") and liquid (urban and industrial wastewater) through the use of Advanced Technologies of Oxidation and algal biomass production with high added value. Spanish title: Revalorizacion y reutilizacion de efluentes gaseosos (gases de combustion "CO2) y liquidos (aguas residuales urbanas e industriales) mediante el uso de Tecnologias Avanzadas de Oxidacion y produccion de biomasa algal de alto valor anadido. Ref: UPO-1260312). FEDER co-financing rate 80%.
conference
https://doi.org/10.5593/sgem2022V/6.2/s25.49
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Proceedings of 22nd International Multidisciplinary Scientific GeoConference SGEM 2022
22nd International Multidisciplinary Scientific GeoConference SGEM 2022, 06-08 December, 2022
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Turkish Acad Sci.
381-388
06-08 December, 2022
website
8943
Secondary thickener wastewater, Microalgae, Kinetic growth parameters, Biofuel products