Fig. 3 illustrates the production costs of the eight studied plants
in accordance with the four key factors determining the production
efficiency. The cost of water supply shows a significantly high
variation among the plants, while the other costs are not relatively
different. Interestingly, all plants lose starch in fibrous residue and
wastewater greater than 130 baht/ton of produced starch. This
means that the plants with production capacity of 100 ton/day lose
more than 390,000 baht/month.