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Analysis of cleaner production potential and water footprint for small-scale sweet potato flour industry

Sweet potato flour is one of the derivative products of sweet potato, especially for raw materials or additives in the food industry. The processing of sweet potato-based products must also be balanced with existing environmental management. For this reason, there is a need for suitable methods to deal with processes that produce minimised wastes that harm the environment. Cleaner production is an approach that offers various environmental benefits for the sweet potato flour industry. Identification of cleaner production alternatives was carried out by the quick scan method for minimising the presence of waste in the sweet potato flour industry. The feasibility of the cleaner production design was analysed by considering technical, environmental, financial, and economic aspects. Identification of water use was done by calculating the water footprint in the whole production process. The water footprint was calculated by adding up the green, blue, and grey water footprints to obtain the total water usage in the production process. The use of water for planting sweet potato (green water) is estimated to be approx. 1.093 m3/ton of sweet potato flour. With a sweet potato flour yield of 50.8%, the production of sweet potato flour requires a water volume (blue water) of 1.32 m3/ton of sweet potato flour. The following cleaner production alternatives were identified as prospective for waste minimisation in the small-scale industry, including good manufacturing practices, repairing flour machines, drying using a greenhouse, training in the selection of raw materials and training in standard operating procedures (SOPs) for flour production, and utilisation of sweet potato peel as animal feed. With the implementation of cleaner production and more efficient use of water, it is expected that the sweet potato flour industry will become a more sustainable industry.