Abstract
Abstract This study assessed the feasibility of an anaerobic sequencing batch and fed-batch biofilm reactor (AnSBBR) with mechanical stirring for vinasse treatment and biomethane production. The amount of liquid medium used was 3 L, and the treated volume was 1 L per cycle. The cycle time was 8 h, with feeding times of 10 min (batch mode) and 240 min (fed-batch mode). Methane productivity increased with the increase in organic load from 1.0 to 10.0 gCOD.L-1.d-1. The maximum molar productivity and yield of methane were 123.4 molCH4.m-3.d-1 and 13.8 mmolCH4.gCOD-1 (88% of the theoretical), respectively. These parameters were lower in fed-batch mode than in batch mode and were lower at 45°C than at 30°C due to biomass adaptation. In general, the values of the kinetic parameters increased with organic load and were similar for the batch and fed-batch modes. Therefore, the increase in organic load positively influenced the process by increased COD removal and lower volatile acids accumulation as the load increased. The batch mode performed better than did the fed-batch mode and 30°C was more suitable than 45°C to produce methane under the studied conditions.
Highlights
Vinasse disposal in soil is widely used because vinasse is rich in many nutrients and minerals that are essential to plant growth
This result can be explained by the increase in the organic matter (COD) fed because under these conditions a greater amount of substrate that could be converted into biogas was fed to the reactor
There were decreases in the volumes of biogas that were produced per cycle with changes in the feed strategy and temperature, which resulted in volumes of 2297 and 785 mL-STP-CH4.Cycle -1, respectively
Summary
Vinasse disposal in soil is widely used because vinasse is rich in many nutrients and minerals that are essential to plant growth. Fertirrigation with vinasse may change physical and chemical characteristics of the soil This activity leads to the soil salinisation, mainly due to the high concentration of potassium in vinasse. These issues show that there is a need to develop more suitable use options for this type of ethanol production effluent (Santos et al, 2013). Biological treatment is recognized as Within this framework, the anaerobic sequencing batch reactors, ASBR (free cells) and AnSBBR (immobilized cells), are being largely studied for bioenergy generation and environmental compliance (Zaiat et al, 2001). Arooj et al (2008) and Kim et al (2005) used an ASBR for Biological treatment is recognized as Within this framework, the anaerobic sequencing batch reactors, ASBR (free cells) and AnSBBR (immobilized cells), are being largely studied for bioenergy generation and environmental compliance (Zaiat et al, 2001). Arooj et al (2008) and Kim et al (2005) used an ASBR for
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