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Alum-based sludge (AbS) recycling for turbidity removal in drinking water treatment: an insight into statistical, technical, and health-related standpoints

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Abstract

This study aimed to evaluate the feasibility of recycling alum-based sludge (AbS) generated from drinking water treatment facility for turbidity removal. A response surface methodology (RSM)-based modeling and factor analysis were first implemented for assessing the optimal conditions of four independent factors, such as initial turbidity concentration, humic acid (HA) concentration, pH, and AbS dose on the water turbidity removal via the use of AbS as a coagulant agent. The optimum values of the four main variables were determined as initial turbidity concentration = 59.65 NTU, pH = 5.56, AbS dose = 19.71 g/L, and HA concentration = 12.28 mg/L, and at the optimum conditions, the percentage of turbidity removal was obtained as 94.81 (± 1.01)% for real water. At the optimum conditions of AbS usage as a coagulant for real water samples, monitoring of water quality parameters of the process indicated no health-related concerns in terms of hardness (all types), alkalinity, pH, residual aluminum, and even bacteriological (fecal and total coliforms) contamination. The results indicated a potential for AbS recycling in the treatment plant as a coagulant agent, although some requirements should be fulfilled before full-scale application.

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Acknowledgements

The authors would like to acknowledge the Water and Wastewater Office of Hamedan Province for financial support of the project (93/194) and Hamedan University of Medical Sciences for providing the laboratory requirements. The authors are also sincerely grateful to Dr. Reza Shokohi (Hamedan University of Medical Sciences, Hamedan, Iran) for his efforts on supplying the laboratory instruments used in this study.

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Authors and Affiliations

  1. Department of Environmental Health Engineering, School of Health, Hamedan University of Medical Sciences, Hamedan, 6517838695, Iran

    Maryam Foroughi, Sona Chavoshi, Marziyeh Bagheri & Mohammad Taghi Samadi

  2. Department of Environmental Engineering, Faculty of Civil Engineering, Yildiz Technical University, Davutpasa, Esenler, 34220, Istanbul, Turkey

    Kaan Yetilmezsoy

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  1. Maryam Foroughi
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  2. Sona Chavoshi
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Correspondence to Mohammad Taghi Samadi.

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Foroughi, M., Chavoshi, S., Bagheri, M. et al. Alum-based sludge (AbS) recycling for turbidity removal in drinking water treatment: an insight into statistical, technical, and health-related standpoints. J Mater Cycles Waste Manag 20, 1999–2017 (2018). https://doi.org/10.1007/s10163-018-0746-1

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