Microalgae cultivation in wastewater effluent from tilapia culture pond for enhanced bioethanol production

Abstract

The large number of wastewaters are generated because of the various production processes. Vegetable and fish processing can be considered an important industry for wastewater generation. The essential method for completing this waste is to digest the organic matter using anaerobic digestion followed by aerobic wastewater treatment processes; however, wastewater from tilapia culture pond retains considerable quantities of inorganic substances, particularly nutrients like nitrogen and phosphorus. The optimal conditions for cultivating Chlorella vulgaris from wastewater treatment effluent from tilapia culture pond were investigated in this study. The appropriate conditions were found to be 10% initial stock suspension, 20 cm depth, and 12 days of culture conditions. C. vulgaris had an optical density of 0.649, a cell density of 17.68 × 105 cells/mL, and biomass of 0.376 ± 94.21 mg/L after cultivation. Discharged wastewater from the fishpond was utilized for the improved growth of microalgae and obtained biomass was used for bioethanol production. This study verified that fishpond wastewater is the best source of nutrients for algal mass production and biofuel applications.

Microalgae-based wastewater treatment for developing economic and environmental sustainability: Current status and future prospects

“… Onay (2018) demonstrated that bioethanol yields of Nannochloropsis gaditana in various concentrations of municipal wastewaters (0, 30, 60, and 100%) ranging from 70.3 ± 2.4 mg g biomass −1 to 94.3 ± 5.5 mg g biomass −1 and 30% of wastewater showed the highest bioethanol yield (94.3 ± 5.5 mg g −1 biomass). A recent study by Bhuyar et al, 2021 showed that C. vulgaris cultivation in wastewater effluent from tilapia culture pond produced biomass of 0.376 ± 94.21 mg L −1 after cultivation and produced the highest ethanol concentration of 33.213 g L −1 after 96 h of fermentation.…”

pH induced stress enhances lipid accumulation in microalgae grown under mixotrophic and autotrophic condition

“…Owing to the favourable potentiality for the treatment of wastewater, reduction of CO 2 , as well as production of biofuel, biochemical, and biomaterial, microalgae have been of great interest over the last few decades (Srimongkol et al, 2022;Venkata Subhash et al, 2022). Microalgae absorb nutrients such as N and P from wastewater and build up organic compounds intracellularly as they develop photosynthetically utilizing CO 2 as a carbon source (Bhuyar et al, 2021). The high cost of nutrients provided as chemical salts, which is a key problem for large-scale microalgae production, can be reduced by growing microalgae using wastewater (Venkata Subhash et al, 2017;Li et al, 2019).…”

Pathogens Removal in a Sustainable and Economic High-Rate Algal Pond Wastewater Treatment System

“…Therefore, selecting cost-effective and efficient alternative wastewater treatment methods is crucial, particularly in low-income countries. In terms of the total number of facilities, algal-based wastewater treatment systems (e.g., high-rate algal ponds and waste stabilization ponds) are among the most commonly used treatment technologies worldwide [9][10][11][12]. HRAPs have recently been regarded as an appropriate option for wastewater treatment due to their significant advantages over traditional pond systems, including simplicity, lower construction and operation costs, low energy consumption, robustness, and sustainability, as well as the ability to reduce nutrients, micropollutants, and pathogenic microbes [13][14][15][16].…”