Green microalga Scenedesmus acutus grown on municipal wastewater to couple nutrient removal with lipid accumulation for biodiesel production

Abstract Background Microalgae cells can be identified as a potential source for new and renewable energy. The economic investigation for biodiesel and bio-active compound production from the microalgae community (Bloom), which are collected from the high rate algal pond (HRAP) constructed to treat municipal wastewater at Zenin wastewater treatment plant, Giza, was the main target of study. Results The microscopical examination showed that Scenedesmus obliquus is the dominant species. The total carotenoids were extracted using jojoba oil and determined by high-performance liquid chromatography (HPLC) to reach 81.44 μg/g. The biodiesel production through acid transesterification reaction recorded 70.6% of fatty acid methyl ester content with high cetane number (44) and low acid value. Such results prove that the obtained biodiesel has better ignition quality. The total phenolic and flavonoid compounds have been derived from the remaining biomass to give 5.36 ± 0.03 and 1.50 ± 0.19 mg/g respectively. Finally, total proteins and carbohydrates content in algal cells were recorded 54.3 and 1.5 mg/g successively Conclusion The preliminary economic evaluation showed that the production of biodiesel and carotenoids from the microalgae growing in municipal wastewater can be considered, as a techno-economic feasible process.

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The impact of abiotic factors on the growth and lipid accumulation of some green microalgae for sustainable biodiesel production

Environmental Science and Pollution Research ◽

10.1007/s11356-021-13781-1 ◽

2021 ◽

Author(s):

Mustafa A. Fawzy ◽

Ahmed M. El-Otify ◽

Mahmoud S. Adam ◽

Safaa S. A. Moustafa

Keyword(s):

Lipid Accumulation ◽

Abiotic Factors ◽

Biodiesel Production ◽

Green Microalgae ◽

The Impact

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Expenditure on the operation of municipal wastewater treatment plants for nutrient removal

Water Science & Technology ◽

10.2166/wst.2000.0225 ◽

2000 ◽

Vol 41 (9) ◽

pp. 281-289 ◽

Cited By ~ 2

Author(s):

O. Nowak

Keyword(s):

Nutrient Removal ◽

Municipal Wastewater ◽

Wastewater Treatment Plants ◽

General Scheme ◽

Operating Costs ◽

Municipal Wastewater Treatment ◽

Wastewater Purification ◽

Labour Costs ◽

Municipal Wastewater Treatment Plants ◽

P Removal

Operating costs of Austrian municipal treatment plants are evaluated for 1989/90 and for 1997, respectively. The results indicate that presently the expenses which can be directly connected to wastewater purification, i.e. energy and chemicals for P removal, comprise only about 20% of the total operating costs. Today, in Austria like in other EU countries, the predominating factor is “labour costs”, even at nutrient removal plants. A general scheme for estimating operating costs is presented that can be applied to WWTPs in other parts of the world. In this scheme the important factors relevant to the operating costs are integrated.

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