Abstract
Research about Hybrid Upflow-Anaerobic Filter (HU-AF) integrated technology for bioenergy generation from vinasse was conducted. Modification of influent flow system, expansion of filter contact area and addition of gas accumulator for biogas collection were used to enhance the degree of vinasse biodegradation biogas generation, and yet to shorten the hydraulic retention time (HRT). Hybrid Upflow-Anaerobic Filter (HU-AF) integrated technology was a double dome reactor with sequential connection, with up-flow inlet distribution inside the reactor. Total volume of HU-AF was 60 m3. A mixing and a feeding chamber, with volume 3 m3, each were installed before HU-AF reactor. A reservoir chamber with volume of 6 m3 was added after HU-AF reactor. OLR was 2.04 kg COD/day. A methanogenic seed sludge derived from anaerobic lagoon. The experiment was carried out initially by seeding, acclimatization and adaptation of microorganisms inside the reactor. A feeding ratio of vinasse: water = 1:4, and initial pH of 6 were adjusted. Result showed that Full-scale HU-AF integrated technology was able to degrade COD with maximum degradation of COD 55.45% at pH 7.1, and shorten the HRT into 32 days. Biogas production was consisted of 57.21 % methane, 13.98% CO2 and various gases 28.1% (H2S, VOC, CO and H2O). This experiment showed that HRT was shorter than conventional reactor.
Highlights
In 2020-2030, Indonesia is predicted facing energy crisis[1]
This research focus on innovative reactor model for high organic wastewater conversion into biogas namely Hybrid Upflow-Anaerobic Filter (HU-AF) that could shorten hydraulic retention time to 20 -25 days
Hybrid Upflow-Anaerobic Filter (HU-AF) integrated technology contained of double dome reactors (C1 and C2) with sequential connection, with up-flow inlet distribution inside the reactor
Summary
In 2020-2030, Indonesia is predicted facing energy crisis[1]. Industrial sector, which mainly depended to fossil fuel, was the one who mostly impacted. Indo Acidatama has utilized vinasse, convert it into biogas energy using four units anaerobic facultative chambers, with total volume of 120,000 m3. The chambers were covered by polymer HDPE, and have total retention time of 40-50 days This technology has weakness, such as spacious, long HRT, dangerous gas leakage, less biogas production etc. If average energy need for ethanol distillation process is 2700 kcal/L, biogas production could be used to produce 511.7-716.4 m3/days. This scheme can be applied in alcohol small industrial center in Sukoharjo that still use woods as energy sources. This research focus on innovative reactor model for high organic wastewater conversion into biogas namely Hybrid Upflow-Anaerobic Filter (HU-AF) that could shorten hydraulic retention time to 20 -25 days. HU-AF reactors models use filters and up-flow inlet feeding to expand contact area between substrates and microorganisms
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