Techno-economic estimation of wastewater phycoremediation and environmental benefits using Scenedesmus obliquus microalgae

Faiz Ahmad Ansari, Balasubramani Ravindran, Sanjay Kumar Gupta, Mahmoud Nasr, Ismail Rawat, Faizal Bux

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This study investigated the dual application of Scenedesmus obliquus for wastewater phycoremediation and biochemical component accumulation in microalgal cells. The microalgae grown in wastewater showed micro-elements uptake and removal efficiencies of 71.2 ± 3.5% COD, 81.9 ± 3.8% NH 4 + , ∼100.0% NO 3 , and 94.1 ± 4.7% PO 4 3− . The growth profile of Scenedesmus obliquus indicated a specific growth rate of 0.42 ± 0.02 1·d −1 and carrying capacity of 0.88 ± 0.04 g L −1 . The lipid, protein, and carbohydrate yields (w·w −1 of dry weight) were 26.5 ± 1.5%, 28.5 ± 1.5%, and 27.5 ± 1.6%, respectively. The de-oiled biomass was subjected to biochemical extraction, achieving protein and carbohydrate yields of 25.3 ± 1.4% and 21.4 ± 1.2%, respectively. Fourier transform infrared spectroscopy showed several functional groups (e.g., N[sbnd]H, CH 3 , CH 2 , C[dbnd]O, C[sbnd]N, P[dbnd]O, and Si[sbnd]O) on the biomass surface, confirming the accumulation of biochemical elements in microalgae. The thermal analysis of microalgal biomass depicted sequential stages of dehydration (60–190 °C), devolatilization (200–490 °C), and solid residue decomposition (490–600 °C). The cost-benefit analysis of microalgae cultivated in wastewater was derived regarding amortization and operating costs and energy and environmental benefits. The net profit of phycoremediation was 16885 US$·y −1 , resulting in a payback period of 14.8 years (i.e., shorter than the project lifetime). Accordingly, the proposed phycoremediation process was economically viable.

Original languageEnglish
Pages (from-to)293-302
Number of pages10
JournalJournal of Environmental Management
Volume240
DOIs
Publication statusPublished - 15 Jun 2019

Fingerprint

Biomass
Wastewater
Carbohydrates
wastewater
Economics
carbohydrate
biomass
economics
Proteins
Cost benefit analysis
protein
cost-benefit analysis
Dehydration
carrying capacity
FTIR spectroscopy
Operating costs
dehydration
Thermoanalysis
Lipids
Functional groups

Keywords

  • Cost analysis
  • Environmental benefits
  • Lipid-extracted microalgae
  • Scenedesmus obliquus
  • Thermo-gravimetric analysis
  • Wastewater phycoremediation

ASJC Scopus subject areas

  • Environmental Engineering
  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law

Cite this

Techno-economic estimation of wastewater phycoremediation and environmental benefits using Scenedesmus obliquus microalgae. / Ansari, Faiz Ahmad; Ravindran, Balasubramani; Gupta, Sanjay Kumar; Nasr, Mahmoud; Rawat, Ismail; Bux, Faizal.

In: Journal of Environmental Management, Vol. 240, 15.06.2019, p. 293-302.

Research output: Contribution to journalArticle

Ansari, Faiz Ahmad ; Ravindran, Balasubramani ; Gupta, Sanjay Kumar ; Nasr, Mahmoud ; Rawat, Ismail ; Bux, Faizal. / Techno-economic estimation of wastewater phycoremediation and environmental benefits using Scenedesmus obliquus microalgae. In: Journal of Environmental Management. 2019 ; Vol. 240. pp. 293-302.
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