Effect of inhibition treatment, type of inocula, and incubation temperature on batch H2 production from organic solid waste
✍ Scribed by Idania Valdez-Vazquez; Elvira Ríos-Leal; Karla M. Muñoz-Páez; Alessandro Carmona-Martínez; Héctor M. Poggi-Varaldo
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 193 KB
- Volume
- 95
- Category
- Article
- ISSN
- 0006-3592
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✦ Synopsis
Two types of induction treatments (heat-shock pretreatment, HSP, and acetylene, Ac), inocula (meso and thermophilic) and incubation temperatures (37 and 558C) were tested according to a full factorial design 2 3 with the aim of assessing their effects on cumulative H 2 production (P H , mmol H 2 /mini-reactor), initial H 2 production rate (R i,H , mmol H 2 /(g VS i  h)), lag time (T lag , h), and metabolites distribution when fermenting organic solid waste with an undefined anerobic consortia in batch mini-reactors. Type of inocula did not have a significant effect on P H , T lag , and R i,H except for organic acids production: mini-reactors seeded with thermophilic inocula had the highest organic acid production. Concerning the induction treatment, it was found that on the average Ac only affected in a positive way the P H and T lag . Thus, P H in Ac-inhibited units (6.97) was 20% larger than those in HSP-inhibited units (5.77). Also, Ac favored a shorter T lag for P H in comparison with HSP (180 vs. 366). Additionally, a positive correlation was found between H 2 and organic acid production. In contrast, solvent concentration in heat-shocked minireactors were slightly higher than in reactors spiked with Ac. Regarding the incubation temperature, on the average mesophilic temperature affected in a positive and very significant way P H (10.07 vs. 2.67) and R i,H (2.43 vs. 0.76) with minimum T lag (87 vs. 459). The positive correlation between H 2 and organic acids production was found again. Yet, incubation temperature did not seem to affect solvent production. A strong interaction was observed between induction treatment and incubation temperature. Thus, Ac-inhibited units showed higher values of P H and R i,H than that HSP-inhibited units only under thermophilic incubation. Contrary to this, HSP-inhibited units showed the highest values of P H and R i,H only under mesophilic conditions. Therefore, the superiority of an induction treatment seems to strongly depend on the incubation temperature.