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Table 1 Type and values of design options, variables and cost factors

From: Effects of production and market factors on ethanol profitability for an integrated first and second generation ethanol plant using the whole sugarcane as feedstock

Factors

Alternatives

Design options

 

Feedstock

Bagasse {B}, bagasse with addition of leaves {B + L}

Pentose utilization

Ethanol fermentation {C5 EtOH} Biogas production {C5 biogas}

Design variables

 

EH residence time

48 hours {48 h}, 96 hours {96 h}

WIS loading in EH

10% {10% WIS}, 20% {20% WIS}, 30% {30% WIS}

Cost factors

 

Enzymatic hydrolysis efficiency

100% {100% EHE}, 250% {250% EHE}

Electricity selling pricea

43, 87b, 140 US$/MWh

Wholesale ethanol pricea

0.3, 0.6c, 1.0 US$/L

Sugarcane cost

30, 65b, 100 US$/dry ton

Leaves cost

13, 26b, 39 US$/dry ton

  1. aProducer selling price of the commodity at the gate of the plant; bpersonal communication with experts from Centro de Tecnologia Canavieira, Piracicaba, Brazil; ccalculation based on data from CEPEA [56]. EH, enzymatic hydrolysis; EHE, enzymatic hydrolysis efficiency; WIS, water-insoluble solids.