Abstract
The toxicity, Leachate Pollution Index (LPI), and risk assessment of the leachate of hazardous sludge are very rarely and scantly studied. This study evaluates the leachate characteristics of the textile industry–central effluent treatment plant sludge. X-ray fluorescence (XRF) analysis determines the sludge’s chemical composition. The Toxicity Characteristic Leaching Procedure (TCLP) is a sample extraction method performed to simulate the leaching through landfills. The leachate samples are tested using inductively coupled plasma-optical emission spectrometry (ICP-OES) techniques for the metal ions. The 30 TCLP tests are performed as per the scheme generated by the Central Composite Design of Experiment (CCDoE). The study provides a novel and flexible framework for developing the Textile-Leachate Pollution Index (T-LPI) using a hybrid fuzzy analytical hierarchical process (FAHP). The metal ions’ weights in the leachate (Al, Cu, Cr, Fe, Mn, Ni, Pb, Zn, K, Mg, Ca) are obtained using FAHP infused with inter-valued triangular fuzzy numbers. The membership grade functions are derived for each metal ion, and the Leachate Pollution Index is estimated for 30 experiments. The experimental runs are ranked based on their LPI values. Pearson’s correlation coefficient indicates a poor association between the metal ions and their presence from different sources. The Human Health Risk Assessment (HHRA) of metal ions (Al, Cu, Cr, Fe, Pb, Zn, Mn, Ni) present in leachate shows the potential non-carcinogenic impact by Ni, Pb, Zn, Cu, Cr, and Mn. In contrast, Fe and Al have shown no adverse non-carcinogenic effect. The carcinogenic risk by Pb and Cr metal ions in leachate lies in the high- and very high-risk levels. The ranking of hazardous sludge sites can help in the immediate disposal of higher LPI value sludge to treatment storage disposal facilities (TSDF) as compared to the sludge with lower LPI. The study provides insight into the human health risk associated with the consumption (oral intake and skin absorption) of leachate-polluted surface water.
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Abbreviations
- ADEI:
-
Average daily exposure by ingestion
- ADED:
-
Average daily exposure by dermal contact
- AET:
-
Average exposure time
- AvgHI:
-
Average Hazard Index values
- AvgCR:
-
Average carcinogenic risk
- CCDoE:
-
Central Composite Design of Experiment
- CETP:
-
Common effluent treatment plant
- CPCB:
-
Central Pollution Control Board
- CR:
-
Carcinogenic risk
- CSF:
-
Carcinogenic slope factor
- ESP:
-
Extremely severely polluted
- FAHP:
-
Fuzzy analytical hierarchical process
- FAM:
-
Fuzzy assessment matrix
- FS:
-
Final scores
- GDP:
-
Gross domestic product
- HCA:
-
Hierarchical cluster analysis
- HHRA:
-
Human Health Risk Assessment
- HI:
-
Hazard Index
- ICP-OES:
-
Inductively coupled plasma-optical emission spectrometry
- IVTFN:
-
Inter-valued triangular fuzzy number
- IVFSs:
-
Inter-valued fuzzy sets
- IVFW:
-
Inter-valued fuzzy weights
- LP:
-
Less polluted
- LPI:
-
Leachate Pollution Index
- LPIDC:
-
Leachate Pollution Index for Developing Countries
- MP:
-
Moderately polluted
- MSW:
-
Municipal solid wastes
- RM:
-
Relation matrix
- SP:
-
Severely polluted
- SSA:
-
Skin surface area
- TCLP:
-
Toxicity Characteristic Leaching Procedure
- T-LPI:
-
Textile-Leachate Pollution Index
- Tri:
-
Triangular membership function
- Trap:
-
Trapezoidal membership function
- TSDFs:
-
Treatment, storage, and disposal facilities
- VCF:
-
Volumetric conversion factor
- XRF:
-
X-ray fluorescence
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Acknowledgements
The authors are grateful to the responding anonymous reviewers for their important suggestions, which support the improvement of our paper’s quality. Thanks are due to the Advanced Research Laboratory in Environmental Engineering and Faecal Sludge Management (ARLEE-FSM) of the Civil Engineering Department, BITS Pilani, India. The authors thank their parent organisation, BITS Pilani, India, for providing all the necessary facilities to carry out this research work.
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Agarwal, S., Singh, A.P. Assessment of Toxicity Characteristics in Leachate from the Textile Industry–Based Sludge Using Leachate Pollution Index. Water Air Soil Pollut 234, 774 (2023). https://doi.org/10.1007/s11270-023-06785-9
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DOI: https://doi.org/10.1007/s11270-023-06785-9