Scholarly record
VALORIZATION OF THE SECONDARY THICKENER WASTEWATER FROM THE CONVENTIONAL DEPURATION PLANTS AS A SUBSTRATE FOR MICROALGAE BIOMASS PRODUCTION
Abstract
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.
Publication Impact Profile
- Captures
- Mendeley - Readers: 4
Publication details
References7
Belaiba A., Bouharat D., Malvis A., Hodaifa G., Feasibility of the hybrid use of Chlorella vulgaris culture together with the conventional biological treatment in the urban wastewater treatment plants. Study of the pH influence on algal growth and biochemical composition of the biomass, Processes, 9, 1640, 2021. DOI: 10.3390/pr9091640
Sathasivam R., Radhakrishnan R., Hashem A., Abd_Allah E.F., Microalgae metabolites: A rich source for food and medicine, Saudi J. Biol. Sci. 26, pp 709-722, 2019. DOI: 10.1016/j.sjbs.2017.11.003
Hodaifa G., Martinez M.E., Orpez R, Sanchez S., Inhibitory effects of industrial olive-oil mill wastewater on biomass production of Scenedesmus obliquus. Ecol. Eng. 42, pp 30-34, 2012. DOI: 10.1016/j.ecoleng.2012.01.020
Becker, E.W, Micro-algae as a source of protein, Biotechnol. Adv. 25, pp 207-210, 2007. DOI: 10.1016/j.biotechadv.2006.11.002
Miller G.L, Use of dinitrosalicylic acid reagent for determination of reducing sugar, Anal. 31, pp 426-428, 1959. DOI: 10.1021/ac60147a030
Maaitah M., Hodaifa G., Malvis A., Sanchez S., Kinetic growth and biochemical composition variability of Chlorella pyrenoidosa in olive oil washing wastewater cultures enriched with urban wastewater, J. Water Process Eng. 35, 101197, 2020. DOI: 10.1016/j.jwpe.2020.101197
G. Hodaifa, Aprovechamiento de las aguas residuales de la industria oleica en la produccion de biomasa microalgas 2004.
View or Download full articleAccess options
SWS access login
Login as SWS Scientific CommitteeLogin as SWS Scientific PartnerLogin as SWS AuthorAuthors and approved SWS contributors will read and export their own linked papers after identity matching by SWS profile, email and SGEM GlobalID.
For librarian assistance: [email protected]
Purchase Instant Access
- Article can be downloaded after successful payment.
- Article may be used according to SWS library access terms.
- Article cannot be redistributed.