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Development and cost-benefit analysis of a novel process for biofuel production from microalgae using pre-treated high-strength fresh cheese whey wastewater

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Abstract

In this study, a novel two-step integrated process is proposed to facilitate the microalgae biofuel production as well as fresh cheese whey wastewater (FCWW) treatment simultaneously. The pre- and post-treatment of high-strength FCWW were performed by means of coagulation and algal cultivation, respectively. The pre-treatment of FCWW for maximum removal of chemical oxygen demand (COD), turbidity (TUR) and total solids (TS) as responses was obtained by statistical optimization of coagulation parameters. The maximum removal of COD, TUR and TS at the optimum level of variables was obtained as 68.09%, 47.80% and 73.63%, respectively. The pre-treated FCWW was further treated by Chlorella pyrenoidosa and observed a significant reduction in the above-mentioned responses (87–94%). The maximum algal biomass yield and lipid productivity were observed as 2.44 g L−1 and 77.41 mg L−1 day−1, respectively. Based on promising results of FCWW treatment and its use as a third-generation biodiesel feedstock, a cost-benefit analysis of the developed process was assessed for microalgal oil production. The total profit earned by the integrated process model was $9.59 million year−1. Accordingly, the estimated production cost of algal oil (TAG) from the developed system was estimated to be $79.03 per barrel.

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Abbreviations

APHA:

American Public Health Association

BOD:

Biological oxygen demand

CCD:

Central composite design

CD:

Chitosan dose

CFS:

Chitosan FCWW sludge

COD:

Chemical oxygen demand

DNS:

3,5-Dinitrosalicyclic acid

FCWW:

Fresh cheese whey wastewater

GC:

Gas chromatography

LEA:

Lipid-extracted algal biomass

M:

Molar

MO:

Multi-objective

NTU:

Nephelometric turbidity unit

OpEx:

Operation expenses

ORP:

Open raceway pond

PP:

Process parameter

RPM:

Rotation per minute

RSM:

Response surface methodology

SS:

Stirring speed

ST:

Stirring time

TAG:

Triacyl glycerol

TS:

Total solids

TUR:

Turbidity

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Acknowledgements

A.P. wishes to express his thanks to Ministry of Human Resource Development (MHRD), Government of India for Institute PhD fellowship.

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Correspondence to Sanjay Kumar.

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The authors declare that they have no conflict of interest.

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Responsible editor: Ta Yeong Wu

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Pandey, A., Srivastava, S. & Kumar, S. Development and cost-benefit analysis of a novel process for biofuel production from microalgae using pre-treated high-strength fresh cheese whey wastewater. Environ Sci Pollut Res 27, 23963–23980 (2020). https://doi.org/10.1007/s11356-020-08535-4

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  • DOI: https://doi.org/10.1007/s11356-020-08535-4

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