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โครงการหนังสืออิเล็กทรอนิกส์ด้านการเกษตร เฉลิมพระเกียรติพระบาทสมเด็จพระเจ้าอยู่หัว

cassava ethanol, blue water consumption is relatively high in the mixing and liquefaction processes
to convert starch to sugar before fermentation and distillation of ethanol.

Molasses ethanol

Sugarcane ethanol

Cassava ethanol

90% 91% 92% 93% 94% 95% 96% 97% 98% 99% 100%

Feedstock cultivation/production Sugar milling
Sugar milling & ethanol conversion Mixing

Liquefaction Distillation

Figure 8.5 Blue water use classified by various processes in the life cycle of bioethanol production

8.4.2 Water deprivation impact potentials from bioethanol production in Thailand

Table 8.3 shows the water deprivation potentials from consumptive water use to produce a

litre of bioethanol in the different provinces and watersheds where the ethanol plants are located.
The results reveal that the water deprivation indicator can help to screen and prioritize the areas

that could potentially face water competition which cannot be revealed just by the WF values. For
example, cassava ethanol produced from the watersheds e.g. Mun, Chi and Chaophraya will result

in the water deprivation impact greater than that produced in the other watersheds. Therefore, the
policy makers should have the measures to support the increased water use for bioethanol

production in those regions in the future.

Table 8.3 Water deprivation potentials of bioethanol production in Thailand

Water deprivation impact potentials
3
Related Provinces (m eq./L ethanol)
watersheds Cassava Sugarcane Molasses
ethanol ethanol ethanol

Mun Nakhonratchasima, Buriram, 442-548 1,806
Ubon Ratchathani

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