| Title | Hydrolysate recycling improves economic feasibility of alkaline pretreatment for bioenergy production |
|---|---|
| ID_Doc | 27364 |
| Authors | Bastos, JA; Remor, PV; Alino, JHL; Frare, LM; Lofhagen, JCP; Edwiges, T |
| Title | Hydrolysate recycling improves economic feasibility of alkaline pretreatment for bioenergy production |
| Year | 2021 |
| Published | Journal Of Environmental Chemical Engineering, 9.0, 5 |
| Abstract | More sustainable processes capable to minimize the demand for chemical inputs and the generation of toxic wastes are essential to scale up the pretreatment strategies applied to lignocellulosic biomass for bioenergy production. This study aimed to evaluate the reuse of the black liquor (hydrolysate) generated after alkaline pretreatment as a sustainable and cheaper strategy to increase biodegradability of grass clippings (GC) and enhance process economic feasibility. Batch anaerobic digestion experiments were carried out at mesophilic temperature (37 degrees C) using KOH and NaOH solutions at a concentration of 5% (w/v). The methane yield of the untreated substrate was 227 LN CH4 kg(-1) VS. Methane yields obtained from pretreated grass clippings using KOH and NaOH at 5% were increased to 30.5% and 34.5% and the hydrolysate generated after the pretreatments showed statistical (p < 0.05) good capacity to be reused up to five sequential batches (fours reuse cycles). The conversion of biomethane to electricity with NaOH hydrolysate recycling was economically feasible, generating a profit of 0.11 USD kg(VS)(-1) while the reuse of KOH hydrolysate resulted in a loss -0.66 USD kg(VS)(-1) due to the different acquisition costs of chemical reagents. Encouraging hydrolyzate recycling after alkaline pretreatment of lignocellulosic biowaste through the creation of a zero discharge system cooperate with the circular economy of wastes. In addition, this sustainable strategy proved to promote a positive economic scenario when less expensive chemical reagents such as NaOH is applied. |
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