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Environment-food nexus in trout ponds: a developed index by combining grey water footprint and life cycle assessment

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Abstract

Fish ponds are reliable food supply in local scale. However, they have adverse environmental impacts due to discharging pollution to the surface waters. To quantify the sustainability of this industry with the perspective of environment-food nexus, the-state-of-the-art index of food environmental footprint (FEF) is used and calculated for trout ponds (TPs). For this purpose, an integrated method is developed for accounting the environmental impacts of TPs by including grey water footprint (GWF) in Recipe, a tool for life cycle impact assessment (LCIA). GWF stands for the embedded water consumption and LCIA combines the potential health and ecological impacts. Here, water quality data of multiple pollutants, BOD, COD, TSS, NO2, NO3, NH4, TN, PO4, DO and Cu+2, in the influent and effluent of Iranian TPs was obtained by field experiments and discussed with data from 9 countries. Results showed that TSS and NH4 are critical pollutants and the average GWF is about 16 m3/kg. Moreover, human health impacts are relatively greater than ecological damages. Nevertheless, FEF is calculated 0.17 and verifies TP sustainability (< 1). Based on environment-food nexus perspective; it means that the positive value of food production dominates TPs’ negative environmental damages. In addition, this study reviewed the efficiency of constructed wetlands for low-strength wastewater treatment. Due to its potential on TSS and NH4 removal, this system can reduce the GWF and added environmental damages of TPs 85% and 58%, respectively. Consequently, FEF decreases to 0.023 showing the very sustainability (< 0.1) of TPs by wastewater treatment.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

BWF:

Blue water footprint

Cmax :

Allowable concentration of pollutants in the receiving water body

Cmin :

Minimum standard value in fresh water

Cnat :

Natural concentration of pollutants in the receiving water body

CWs:

Constructed wetlands

CEI:

Cumulative environmental impacts

DALY:

Disability-adjusted years

FEF:

Food environmental footprint

GrWF:

Green water footprint

GWF:

Grey water footprint

HLR:

Hydraulic loading rate

LCA:

Life cycle assessment

LCIA:

Life cycle impact assessment

Δ S :

Equivalent environmental damages

ΔC:

Net added pollution

TPs:

Trout ponds

WF:

Water footprint

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Authors and Affiliations

Authors

Contributions

Parham Tafazzoli: Investigation, methodology, software, validation, data curation, visualization, writing (original draft). Shervin Jamshidi: Conceptualization, methodology, analysis, supervision and project administration, writing (review and editing).

Corresponding author

Correspondence to S. Jamshidi.

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Conflict of interest

The authors declare that they have no known competing financial or non-financial interests that could have appeared to influence the work reported in this paper.

Additional information

Editorial responsibility: M. Shabani.

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Tafazzoli, P., Jamshidi, S. Environment-food nexus in trout ponds: a developed index by combining grey water footprint and life cycle assessment. Int. J. Environ. Sci. Technol. (2024). https://doi.org/10.1007/s13762-024-05688-4

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  • DOI: https://doi.org/10.1007/s13762-024-05688-4

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