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Waste valorization and resource conservation in rice processing industries—an analytical study from Pakistan

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Abstract

The study aims to analyze and enhance the eco-efficiency of rice processing in Pakistan while focusing on pollution prevention, waste management, and valorization opportunities. Three rice mills were selected, and physical and chemical properties of their wastewater and solid waste were analyzed. It is depicted that rice husk has the highest share in the solid waste stream and possesses a significant renewable energy potential with a calorific value of 16 MJ/kg and a much lower energy cost of about 0.4 USD/MJ as compared to diesel and furnace oil, i.e., 36.8 and 26.2 USD/MJ, respectively. Recovery of commercially valuable by-products from the effluent of parboiling process is also investigated, and about 0.25 kg of starch/L from wastewater has been effectively reclaimed by wet milling method. The effluent water is also analyzed using Streeter–Phelps model which confirmed that value of contaminants in the wastewater of two of the selected rice mills exceeds the dilution capacity of the receiving body, with dissolved oxygen values at critical level as 0.54 mg/L and -20.7 mg/L respectively. Water pinch analysis and water cascade analysis (WCA) have also been employed to monitor and manage the water footprints. While the concentration composite curve depicted that about 0.8 ton/h of freshwater is saved by an application of smart water integration and pinch point was determined as 1814 ppm. While the WCA confirms that a total water demand of 45.3 kg/s at the third purity level has been reduced to 28.0 kg/s at the lowest purity level.

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Authors and Affiliations

  1. Sustainable Development Study Centre, Government College University Lahore, Lahore, Pakistan

    Rizwan Rasheed, Asfra Rizwan & Hajra Javed

  2. Department of Environmental Science, Kinnaird College for Women Lahore, Lahore, Pakistan

    Roshna Umer & Almas Hamid

  3. College of Earth and Environmental Sciences, University of the Punjab, Lahore, Pakistan

    Sajid Rashid Ahmad

  4. Department of Architecture and Built Environment, University of Nottingham, Nottingham, UK

    Yuehong Su

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  1. Rizwan Rasheed
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  2. Roshna Umer
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  7. Yuehong Su
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Correspondence to Rizwan Rasheed.

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Rasheed, R., Umer, R., Hamid, A. et al. Waste valorization and resource conservation in rice processing industries—an analytical study from Pakistan. Environ Sci Pollut Res 27, 43372–43388 (2020). https://doi.org/10.1007/s11356-020-10457-0

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